Schaeffler Product catalogue - medias
Ihre Eingaben des Auswahlassistenten werden im Hintergrund gespeichert, Sie können den Assistenten jederzeit wieder aufrufen.
(0)
Needle roller bearings, aligning bearings
 

The bearings:

 
 
  • can support high to very high radial forces
  • are used when the load
    Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

    See Contact surface
    carrying capacity or accuracy
    Deviation of the actual dimension from the nominal dimension as described by tolerances. For monorail systems, the parallel deviation of the reference surfaces within given tolerances.

    See
    Running accuracy
    Dimensional accuracy
    of drawn cup needle roller
    See Rolling element
    bearings with open ends is no longer sufficient and the high load
    Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

    See Contact surface
    capacity of cylindrical roller bearings is not yet required
  • can only support radial loads and, as a result, are highly suitable for use as non-locating bearings (they permit axial displacement
    Travel in an axial direction due to axial clearance and deflection
    of the shaft relative to the housing
    See Mounting dimenstions
    in the bearing)
  • permit high speeds in spite of line contact
  • compensate misalignments between the shaft and housing
    See Mounting dimenstions
    (aligning needle roller
    See Rolling element
    bearings)
  • require only a very small radial design envelope, particularly if the bearing arrangement
    Arrangement of bearings, for example locating/locating, semi-locating/semi-locating, non-locating/non-locating, or semi-locating bearings in tandem, O or X arrangement
    is designed without an inner ring
  • are available in numerous sizes and designs
  • result in particularly compact, cost-effective and economical bearing arrangements.
 
   

Figure 1
Needle roller bearing
See Rolling bearing
in X-life quality: comparison of load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
carrying capacity with drawn cup needle roller bearing
See Rolling bearing
(open ends) of almost identical dimensions; angular adjustment facility of aligning needle roller
See Rolling element
bearings (permissible adjustment angle)

Cr =  basic dynamic load
The term dynamic indicates that the operating condition is with the bearing rotating. This is not a variable load.
rating

 

imageref_22414792587_All.gif

 
 

Bearing design

 
 

Needle roller bearings are available as:

 
   
 

Needle roller bearings are X-life bearings ➤ link .

 
imageref_18348417035_All.gif   In addition to the bearings described in this chapter, needle roller
See Rolling element
bearings are also available in other series, designs and sizes, as well as for specific applications, by agreement.
 
 

Needle roller bearings

Needle roller bearings are non-locating bearings

 

Needle roller bearings are rolling bearings with a low radial section height and high load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
carrying capacity, which are used as non-locating bearings and are part of the group of radial needle roller
See Rolling element
bearings. These bearings comprise machined outer rings, needle roller
See Rolling element
and cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
assemblies and removable inner rings, i.e. they can be supplied with or without an inner ring in accordance with the application ➤ Figure 2 to ➤ Figure 8. In contrast to the outer cups of drawn cup needle roller
See Rolling element
bearings, which are produced by forming methods, the bearing rings are machined. Due to their non-locating bearing
Non-locating bearings of the longitudinal, transverse or tilting type permit displacement within the bearing requiring almost no force
function, the bearings cannot guide the shaft axially in any direction.

 
 

Needle roller bearings with ribs on the outer ring

 

Needle roller bearings with ribs are ready-to-fit units. The outer ring and needle roller
See Rolling element
and cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
assembly form a self-retaining unit. The needle roller
See Rolling element
and cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
assembly is guided by the ribs on the outer ring. The outer ring has a lubrication
Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.

See
Lubrication method
Lubrication condition
Recirculating lubrication
Lubrication technology
One-off lubrication
Hydrodynamic lubrication
Lubricant change intervall
Lubricant change
Lubricant
Lubricant paste
Oil
Grease
Lubrication film
Lubrication system
groove and at least one lubrication
Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.

See
Lubrication method
Lubrication condition
Recirculating lubrication
Lubrication technology
One-off lubrication
Hydrodynamic lubrication
Lubricant change intervall
Lubricant change
Lubricant
Lubricant paste
Oil
Grease
Lubrication film
Lubrication system
hole. There is no relubrication facility in types NK with Fw ≦ 10 mm and NKI with d ≦ 7 mm. The bearings are predominantly of a single row design, type RNA69 is of a double row design above an enveloping circle diameter Fw = 40 mm and is therefore fitted with two needle roller
See Rolling element
and cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
assemblies. The bearings are available:

 
   
 

Needle roller bearings with ribs on the outer ring, without inner ring

 

Needle roller bearings with ribs on the outer ring and without an inner ring are available in the following types and dimension series:

 
   

For bearing arrangements with particularly compact radial dimensions

 

Bearings without an inner ring are highly suitable for bearing arrangements with particularly compact radial dimensions, if the shaft raceway can be hardened and ground ➤ section . If no inner ring is used, the shaft can be designed to a greater thickness and thus with increased rigidity.

 

Length compensation (axial displacement facility)

 

Radial needle roller
See Rolling element
bearings are used as non-locating bearings, i.e. when the shaft must allow axial length compensation relative to the housing. For bearings without an inner ring, the axial displacement
Travel in an axial direction due to axial clearance and deflection
facility of the shaft is dependent on the width of the shaft raceway.

 
 

   

Figure 2
Needle roller bearings with ribs on the outer ring, without inner ring, open

Fr =  radial load
Symbole/00016410_mei_in_0k_0k.gif  Single row needle roller
See Rolling element
bearing
Symbole/00016411_mei_in_0k_0k.gif  Double row needle roller
See Rolling element
bearing

 

imageref_22292806539_All.gif

 
   

Figure 3
Needle roller bearings with ribs on the outer ring, without inner ring, sealed on one or both sides

Fr =  radial load
Symbole/00016410_mei_in_0k_0k.gif  Single row needle roller
See Rolling element
bearing, contact seal
See Seal
on one side
Symbole/00016411_mei_in_0k_0k.gif  Single row needle roller
See Rolling element
bearing, contact seal
See Seal
on both sides

 

imageref_22292887563_All.gif

 
 

Needle roller bearings with ribs on the outer ring, with inner ring

 

Needle roller bearings with ribs on the outer ring and with an inner ring are available in the following types and dimension series:

 
   
 

Bearings with an inner ring are used if the shaft cannot be configured as a rolling bearing
Ready-to-fit machine element, often defined in standards, for transmitting movements, loads and tilting moments with a high level of efficiency; rolling bearings consist of rolling elements, cages and raceways on rings, guideways or carriages as well as lubricant and, if necessary, seals and accessories
raceway. The bearings are of a single row design, NA69 is of a double row design from d ≧ 32 mm.

 

Axial displacement of the inner ring

 

For bearings with an inner ring, the axial displacement
Travel in an axial direction due to axial clearance and deflection
of the shaft relative to the housing
See Mounting dimenstions
occurs during rotational motion, without constraint in the bearing, between the needle rollers
Cylindrical rolling elements with a high length/diameter ratio (DIN 5402 Part 3)
and the inner ring raceway without ribs. The maximum axial displacement
Travel in an axial direction due to axial clearance and deflection
s is given in the product tables. Where larger displacements occur, the standard ring can be replaced by a wider inner ring IR. Inner rings ➤ link .

 
 

Replacement of inner rings

imageref_17757187211_All.gif   In the case of the standard bearings, the inner rings are matched to the enveloping circle tolerance F6 and can be interchanged with each other (mixed use) within the same accuracy
Deviation of the actual dimension from the nominal dimension as described by tolerances. For monorail systems, the parallel deviation of the reference surfaces within given tolerances.

See
Running accuracy
Dimensional accuracy
class.
 
 

   

Figure 4
Needle roller bearings with ribs on the outer ring, with inner ring, open

Fr =  radial load
Symbole/00016410_mei_in_0k_0k.gif  Single row needle roller
See Rolling element
bearing
Symbole/00016411_mei_in_0k_0k.gif  Double row needle roller
See Rolling element
bearing

 

imageref_22292890635_All.gif

 
   

Figure 5
Needle roller bearings with ribs on the outer ring, with inner ring, sealed on one or both sides

Fr =  radial load
Symbole/00016410_mei_in_0k_0k.gif  Single row needle roller
See Rolling element
bearing, contact seal
See Seal
on one side
Symbole/00016411_mei_in_0k_0k.gif  Single row needle roller
See Rolling element
bearing, contact seal
See Seal
on both sides

 

imageref_22292893707_All.gif

 
 

Needle roller bearings without ribs on the outer ring

The bearing components can be mounted independently of each other

 

Needle roller bearings without ribs on the outer ring are ready-to-fit units. The bearings are not self-retaining. This means that the outer ring, needle roller
See Rolling element
and cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
assembly and inner ring can be fitted independently of each other. The needle roller
See Rolling element
and cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
assembly can be mounted in different ways: it can be fitted together with the shaft, the outer ring or the inner ring, or it can be subsequently inserted between the outer ring and shaft or inner ring. The needle roller
See Rolling element
and cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
assembly and outer ring must not, however, be interchanged with identical components from other bearings during mounting, but should always be fitted as supplied. The majority of the bearings are of a single row design. Double row bearings comprise two single row needle roller
See Rolling element
and cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
assemblies arranged adjacent to each other. They have a lubrication
Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.

See
Lubrication method
Lubrication condition
Recirculating lubrication
Lubrication technology
One-off lubrication
Hydrodynamic lubrication
Lubricant change intervall
Lubricant change
Lubricant
Lubricant paste
Oil
Grease
Lubrication film
Lubrication system
groove in the circumference of the outer ring, at least one lubrication
Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.

See
Lubrication method
Lubrication condition
Recirculating lubrication
Lubrication technology
One-off lubrication
Hydrodynamic lubrication
Lubricant change intervall
Lubricant change
Lubricant
Lubricant paste
Oil
Grease
Lubrication film
Lubrication system
hole in the outer ring and the suffix ZW-ASR1 ➤ section . Bearings are also available with a lubrication
Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.

See
Lubrication method
Lubrication condition
Recirculating lubrication
Lubrication technology
One-off lubrication
Hydrodynamic lubrication
Lubricant change intervall
Lubricant change
Lubricant
Lubricant paste
Oil
Grease
Lubrication film
Lubrication system
hole in the inner ring; these have the suffix IS1 ➤ section .

 
 

Needle roller bearings without ribs on the outer ring are available:

 
   
 

Needle roller bearings without ribs on the outer ring, without inner ring

 

Needle roller bearings without ribs on the outer ring and without an inner ring are available in the following types:

 
   

For bearing arrangements with particularly compact radial dimensions

 

Bearings without an inner ring are highly suitable for bearing arrangements with particularly compact radial dimensions, if the shaft raceway can be hardened and ground ➤ section . If no inner ring is used, the shaft can be designed to a greater thickness and thus with increased rigidity. If the shaft raceway is produced to the appropriate dimensional and geometrical accuracy, bearing arrangements with increased running accuracy
Measured in terms of radial runout and axial runout, due to the dimensional and geometrical tolerances of the bearing in motion, defined according to DIN
can be achieved.

 

Length compensation (axial displacement facility)

 

Radial needle roller
See Rolling element
bearings are used as non-locating bearings, i.e. when the shaft must allow axial length compensation relative to the housing. For bearings without an inner ring, the axial displacement
Travel in an axial direction due to axial clearance and deflection
facility of the shaft is dependent on the width of the shaft raceway.

 
   

Figure 6
Needle roller bearings without ribs on the outer ring, without inner ring, open

Fr =  radial load
Symbole/00016410_mei_in_0k_0k.gif  Single row needle roller
See Rolling element
bearing
Symbole/00016411_mei_in_0k_0k.gif  Double row needle roller
See Rolling element
bearing

 

imageref_22293075979_All.gif

 
 

Needle roller bearings without ribs on the outer ring, with inner ring

 

Needle roller bearings without ribs on the outer ring and with an inner ring are available in the following types:

 
   
 

Bearings with an inner ring are used if the shaft cannot be configured as a rolling bearing
Ready-to-fit machine element, often defined in standards, for transmitting movements, loads and tilting moments with a high level of efficiency; rolling bearings consist of rolling elements, cages and raceways on rings, guideways or carriages as well as lubricant and, if necessary, seals and accessories
raceway.

 

Axial displacement of the inner ring

 

For bearings with an inner ring, the axial displacement
Travel in an axial direction due to axial clearance and deflection
of the shaft relative to the housing
See Mounting dimenstions
occurs during rotational motion, without constraint in the bearing, between the needle rollers
Cylindrical rolling elements with a high length/diameter ratio (DIN 5402 Part 3)
and the inner ring raceway without ribs. The maximum axial displacement
Travel in an axial direction due to axial clearance and deflection
s is given in the product tables ➤ dimension table. Where larger displacements occur, the standard ring can be replaced by a wider inner ring IR. Inner rings ➤ link .

 
 

Replacement of inner rings

imageref_17757187211_All.gif   The outer ring and the needle roller
See Rolling element
and cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
assembly are matched to each other and must not be interchanged during mounting with com­ponents from other bearings of the same size. In the case of the standard bearings, the inner rings are matched to the enveloping circle tolerance F6 and can be interchanged with each other (mixed use) within the same accuracy
Deviation of the actual dimension from the nominal dimension as described by tolerances. For monorail systems, the parallel deviation of the reference surfaces within given tolerances.

See
Running accuracy
Dimensional accuracy
class.
 
 

   

Figure 7
Needle roller bearings without ribs on the outer ring, with inner ring, open

Fr =  radial load
Symbole/00016410_mei_in_0k_0k.gif  Single row needle roller
See Rolling element
bearing
Symbole/00016411_mei_in_0k_0k.gif  Double row needle roller
See Rolling element
bearing

 

imageref_22293079051_All.gif

 
 

Aligning needle roller
See Rolling element
bearings

Suitable for the compensation of angular misalignments

 

Aligning needle roller
See Rolling element
bearings comprise drawn outer cups, plastic support rings with a concave inner profile, outer rings with a spherical outside surface, needle roller
See Rolling element
and cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
assemblies and removable inner rings ➤ Figure 8. As a result of their design, these bearings can compensate misalignments, since the outer ring, with its spherical outside surface, is able to move in the concave plastic support ring ➤ section . Due to their non-locating bearing
Non-locating bearings of the longitudinal, transverse or tilting type permit displacement within the bearing requiring almost no force
function, the bearings cannot guide the shaft axially in any direction.

 
 

Aligning needle roller
See Rolling element
bearings without inner ring

Available types

 

Aligning needle roller
See Rolling element
bearings are available in type RPNA ➤ Figure 8.

 

For bearing arrangements with particularly compact radial dimensions

 

Bearings without an inner ring are highly suitable for bearing arrangements with low section height and particularly compact dimensions, if the shaft raceway can be hardened and ground ➤ section . If no inner ring is used, the shaft can be designed to a greater thickness and thus with increased rigidity.

 
   

Figure 8
Aligning needle roller bearing
See Rolling bearing
without inner ring

Fr =  radial load
Symbole/00016410_mei_in_0k_0k.gif  Drawn outer cup
Symbole/00016411_mei_in_0k_0k.gif  Plastic support rings with concave inner profile
Symbole/00016412_mei_in_0k_0k.gif  Outer ring with spherical outside surface
Symbole/00016413_mei_in_0k_0k.gif  Needle roller and cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
assembly

 

imageref_22293083275_All.gif

 
 

Aligning needle roller
See Rolling element
bearings with inner ring

Available types

 

Aligning needle roller
See Rolling element
bearings are available in type PNA ➤ Figure 9.

 
 

Bearings with an inner ring are used if the shaft cannot be configured as a rolling bearing
Ready-to-fit machine element, often defined in standards, for transmitting movements, loads and tilting moments with a high level of efficiency; rolling bearings consist of rolling elements, cages and raceways on rings, guideways or carriages as well as lubricant and, if necessary, seals and accessories
raceway.

 

Axial displacement of the inner ring

 

For bearings with an inner ring, the axial displacement
Travel in an axial direction due to axial clearance and deflection
of the shaft relative to the housing
See Mounting dimenstions
occurs during rotational motion, without constraint in the bearing, between the needle rollers
Cylindrical rolling elements with a high length/diameter ratio (DIN 5402 Part 3)
and the inner ring raceway without ribs. The maximum axial displacement s is given in the product tables ➤ dimension table. Where larger displacements occur, the standard ring can be replaced by a wider inner ring of series IR. Inner rings ➤ link .

 
 

Replacement of inner rings

imageref_17757187211_All.gif   In the case of the standard bearings, the inner rings are matched to the enveloping circle tolerance F6 and can be interchanged with each other (mixed use) within the same accuracy
Deviation of the actual dimension from the nominal dimension as described by tolerances. For monorail systems, the parallel deviation of the reference surfaces within given tolerances.

See
Running accuracy
Dimensional accuracy
class.
 
 

   

Figure 9
Aligning needle roller bearing
See Rolling bearing
with inner ring

Fr =  radial load

 

imageref_22293085195_All.gif

 
 

X-life premium quality

imageref_19964530187_All.gif   The radial needle roller
See Rolling element
bearings described here are X-life bearings. These bearings are characterised by a very high load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
carrying capacity and long rating life. This is achieved, for example, through the modified internal construction and optimised contact geometry between the needle rollers
Cylindrical rolling elements with a high length/diameter ratio (DIN 5402 Part 3)
and raceways, as well as through the higher quality
See DIN 55 350 part 11 and ISO 8402 for terminology and definitions.
of the steel and rolling elements, higher surface quality
See DIN 55 350 part 11 and ISO 8402 for terminology and definitions.
and appropriate heat treatment and/or coating.
 
 

Advantages

 

The technical enhancements offer a range of advantages, such as:

 
 
  • a more favourable load
    Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

    See Contact surface
    distribution in the bearing and thus a higher dynamic load
    The term dynamic indicates that the operating condition is with the bearing rotating. This is not a variable load.
    carrying capacity of the bearings
  • quieter running
  • running with reduced friction
    The resistance to relative movement of two bodies in contact with each other; subdivided into friction terms, friction types and friction conditions
    and greater energy efficiency
  • lower heat generation in the bearing
  • higher possible speeds
  • lower lubricant
    Gaseous, fluid, consistent, plastic or solid material for reduction of friction and wear between two friction elements.
    consumption and, consequently, longer maintenance
    Inspection, maintenance and repair of equipment and machines.
    intervals
  • a measurably longer operating life
  • high operational security
  • compact, environmentally-friendly bearing arrangements.
 

Lower operating costs, higher machine availability

 

In conclusion, these advantages improve the overall cost-efficiency of the bearing position significantly and thus bring about a sustainable increase in the efficiency of the machine and equipment.

 

Suffix XL

 

X-life radial needle roller
See Rolling element
bearings include the suffix XL in the designation ➤ Figure 10, ➤ Figure 14 and ➤ dimension table.

 
   

Figure 10
Calculated rating life
The basic rating life is the life reached or exceeded by 90% of a sufficiently large group of apparently identical bearings before the first evidence of material fatigue develops
and rating life
The basic rating life is the life reached or exceeded by 90% of a sufficiently large group of apparently identical bearings before the first evidence of material fatigue develops
verified in tests – comparison between X-life needle roller bearing
See Rolling bearing
and bearings without X-life quality

Lnmr =  adjusted reference rating life
Symbole/00016410_mei_in_0k_0k.gif  Bearing without X-life quality
Symbole/00016411_mei_in_0k_0k.gif  Calculated rating life
Symbole/00016412_mei_in_0k_0k.gif  Rating life
The basic rating life is the life reached or exceeded by 90% of a sufficiently large group of apparently identical bearings before the first evidence of material fatigue develops
verified in tests

 

imageref_22293474571_All.gif

 
 

Areas of application

 

Due to their special technical features, X-life needle roller
See Rolling element
bearings are highly suitable for bearing arrangements in:

 
 
  • printing machinery
  • the food and packaging industry
  • compressors
  • fluid and hydraulic pumps
  • automotive chassis and gearboxes
  • gearboxes for industrial, rail and wind turbine applications
  • agricultural vehicles and equipment.
 
imageref_17757210635_All.gif   X-life indicates a high product performance density
Mass ratio of a lubricant with respect to its volume to DIN 51 757.

Usual units for solid materials (apparent density):
- gramms per cubic centimeter g/cm3

fluids:
- gramms per millilitre g/ml

gases:
- kilogrammes per cubic meter kg/cm3

Other permissible units are kg/dm3, kg/cm3, kg/l
and thus a particularly significant benefit to the customer.
 
 

Load carrying capacity

 

The bearings are pure radial bearings

 

Radial needle roller
See Rolling element
bearings support very high radial forces due to the presence of line contact, but may only be subjected to purely radial load. If the bearing position is also required to support axial forces, the needle roller
See Rolling element
bearings can, for example, be combined with axial needle roller
See Rolling element
bearings AXW
 ➤ Figure 11. An extensive range of combined needle roller
See Rolling element
bearings is also available for combined loads ➤ link .

 
imageref_17757187211_All.gif   If the surface of the shaft raceway is produced to DIN 617, the basic load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
ratings Cr in the product tables must be reduced by 15%.
 
 

   

Figure 11
Radial needle roller bearing
See Rolling bearing
combined with axial needle roller
See Rolling element
bearing

Fr =  radial load
Fa =  axial load
Symbole/00016410_mei_in_0k_0k.gif  Needle roller bearing NK
Symbole/00016411_mei_in_0k_0k.gif  Axial needle roller
See Rolling element
bearing AXW


 

imageref_22293478795_All.gif

 
 

Compensation of angular misalignments

 

The bearings are not suitable for the compensation of shaft misalignments relative to the housing.

 

Needle roller bearings with or without ribs on the outer ring are not suit­able for the compensation of angular misalignments. The extent to which a misalignment
Deviation of an actual line from a theoretical ideal line, for example a bearing axis from the shaft axis; may be due to machining, flexing of shaft or deformation of housing.
of the shaft can be tolerated relative to the housing
See Mounting dimenstions
bore is dependent on factors such as the design of the bearing arrangement, the size of the bearing, the operating clearance
The amount by which the bearing rings in a fitted bearing can be moved in the radial or axial direction from one extreme position to the other.
and the load. As a result, no guide value can be specified here for a possible misalignment. If angular misalignments occur, aligning needle roller
See Rolling element
bearings can be used ➤ Figure 12.

 
imageref_17757187211_All.gif   In all cases, misalignments cause increased running noise, place increased strain on the cages and have a harmful influence on the operating life
See Life, rating
of the bearings.
 
 

Aligning needle roller
See Rolling element
bearings

Aligning needle roller
See Rolling element
bearings can compensate static misalignment

 

Due to the spherical outer ring and the concave support ring, aligning bearings can compensate static misalignments between the shaft and housing
See Mounting dimenstions
of up to  ➤ Figure 12 and ➤ section . The bearings must not, however, be used to support swivel or tumbling motion. During adjustment motion between the outer cup and the ring, a breakaway torque occurs. In order that adjustment motion can take place, the tolerances
See
Running accuracy
Dimensional accuracy
for the housing
See Mounting dimenstions
bore must be observed ➤ Table 6.

 
   

Figure 12
Compensation of misalignments

Symbole/00016410_mei_in_0k_0k.gif  Spherical outer ring
Symbole/00016411_mei_in_0k_0k.gif  Concave support ring

 

imageref_22293483019_All.gif

 
 

Lubrication

 
 

Needle roller bearings with or without ribs on the outer ring

Greased bearings

 

The sealed bearings
Rolling bearings with fitted seals for protection against lubricant loss and contamination.
are greased with a high quality
See DIN 55 350 part 11 and ISO 8402 for terminology and definitions.
lithium complex soap grease
See
Lubricant
Grease cartridge
Fatty acids
to GA08. Arcanol Load150 is suitable for relubrication. For this purpose, the outer ring has a lubrication
Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.

See
Lubrication method
Lubrication condition
Recirculating lubrication
Lubrication technology
One-off lubrication
Hydrodynamic lubrication
Lubricant change intervall
Lubricant change
Lubricant
Lubricant paste
Oil
Grease
Lubrication film
Lubrication system
groove and a lubrication
Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.

See
Lubrication method
Lubrication condition
Recirculating lubrication
Lubrication technology
One-off lubrication
Hydrodynamic lubrication
Lubricant change intervall
Lubricant change
Lubricant
Lubricant paste
Oil
Grease
Lubrication film
Lubrication system
hole ➤ section .

 
imageref_17757187211_All.gif   Do not wash greased bearings out prior to mounting. If mounting is carried out using thermal tools, the bearings should not be heated to a tem­perature in excess of +80 °C, taking account of the grease
See
Lubricant
Grease cartridge
Fatty acids
filling and seal
Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary
material. If higher heating
Controlled heating to approximately 80°C above room temperature by, for example, induction heating equipment electric ovens, heating plates or clean oil baths for easier assembly.
temperatures are required, it must be ensured that the permissible upper temperature limits for grease
See
Lubricant
Grease cartridge
Fatty acids
and seals
Elements intended to prevent the ingress of gaseous, fluid and solid materials through the gaps formed by adjacent components whilst stationary or moving.

See
Seal
Operating life
Friction
are not exceeded.
 
  Schaeffler recommends the use of induction heating
Controlled heating to approximately 80°C above room temperature by, for example, induction heating equipment electric ovens, heating plates or clean oil baths for easier assembly.
devices for heating
Controlled heating to approximately 80°C above room temperature by, for example, induction heating equipment electric ovens, heating plates or clean oil baths for easier assembly.
purposes ➤ link .
 

Ungreased bearings

 

Open bearings are not greased. They must be lubricated with oil
Fluid lubricant with a mineral oil and/or synthetic oil base, usually with active ingredients or additives.
or grease.

 

Compatibility with plastic cages

 

When using bearings with plastic cages, compatibility between the lubricant
Gaseous, fluid, consistent, plastic or solid material for reduction of friction and wear between two friction elements.
and the cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
material must be ensured if synthetic oils, lubricating greases
Consistent grease with a mineral oil and/or synthetic oil base with thickener as well as active ingredients or additives. See DIN 51 825 part 1 for demands on greases, grease type K, operating temperature range -20 to 140°C or DIN 51 825 part 2, for grease type KT.
with a synthetic oil
Fluid lubricant with a mineral oil and/or synthetic oil base, usually with active ingredients or additives.
base or lubricants containing a high proportion of EP additives are used.

 

Observe oil change
See Lubricant change
intervals

 

Aged oil
Fluid lubricant with a mineral oil and/or synthetic oil base, usually with active ingredients or additives.
and additives
Lubricant additive to improve viscosity-temperature behaviour or pour point, prevent corrosion, oxidation or ageing or reduce wear or foaming
in the oil
Fluid lubricant with a mineral oil and/or synthetic oil base, usually with active ingredients or additives.
can impair the operating life
See Life, rating
of plastics at high temperatures. As a result, stipulated oil change
See Lubricant change
intervals must be strictly observed.

 
imageref_18348417035_All.gif   If there is any uncertainty regarding the suitability of the selected lubricant
Gaseous, fluid, consistent, plastic or solid material for reduction of friction and wear between two friction elements.
for the application, please consult Schaeffler or the lubricant
Gaseous, fluid, consistent, plastic or solid material for reduction of friction and wear between two friction elements.
manufacturer.
 
 

Sealing

 

The bearings are open or sealed

 

Needle roller bearings are available in an unsealed design in accordance with DIN 617:2008 and ISO 3245:2015 and a sealed design in accordance with DIN 617:2008.

 
 

Sealed bearings

Integrated seals
Elements intended to prevent the ingress of gaseous, fluid and solid materials through the gaps formed by adjacent components whilst stationary or moving.

See
Seal
Operating life
Friction
are particularly space-saving

 

Under normal operating conditions, contact seals
Elements intended to prevent the ingress of gaseous, fluid and solid materials through the gaps formed by adjacent components whilst stationary or moving.

See
Seal
Operating life
Friction
give protection
Coatings and layers on metallic materials to prevent damage from corrosion.
against contamination, spray water and the loss of lubricant. The integration of such seals
Elements intended to prevent the ingress of gaseous, fluid and solid materials through the gaps formed by adjacent components whilst stationary or moving.

See
Seal
Operating life
Friction
into the bearing provides a compact, reliable, proven and economical sealing
See Seals
solution ➤ Figure 3 and ➤ Figure 5. The sealing
See Seals
material used is the oil-resistant and wear-resistant elastomer material NBR. The seal
Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary
lips are in contact with a defined contact pressure against the sliding surface.

 
 

Unsealed bearings

 

In the case of unsealed bearings, sealing
See Seals
of the bearing position must be carried out in the adjacent construction. This must reliably prevent:

 
 
  • moisture and contaminants from entering the bearing
  • the egress of lubricant
    Gaseous, fluid, consistent, plastic or solid material for reduction of friction and wear between two friction elements.
    from the bearing.
 
imageref_17757187211_All.gif   Sealing rings must not be used as running surfaces
The effective surface is the surface which separates the object from its surrounding medium.The actual surface is the approximate image from measuring technology of the ideal geometric surface. Note: various measuring processes or measuring conditions (e.g. stylus radius) can give different actual surfaces.The geometric surface is an ideal surface whose nominal form is defined by a drawing or other technical documentation. See DIN 4760 for further details.

See
Surface protection
Surface tension
for the cage, as these will be damaged as a result and no longer able to fulfil their sealing
See Seals
function.
 
 

Sealing of the bearing position with a sealing ring G

Effective sealing
See Seals
elements for use in sealing
See Seals
open bearings

 

Bearing positions with open needle roller
See Rolling element
bearings can be sealed cost-effectively with sealing rings G. The sealing
See Seals
rings are designed as contact seals
Elements intended to prevent the ingress of gaseous, fluid and solid materials through the gaps formed by adjacent components whilst stationary or moving.

See
Seal
Operating life
Friction
and are arranged in front of the bearing ➤ Figure 13. They are suitable for circumferential velocities at the running surface of up to 10 m/s and protect the bearing position reliably against contamination, spray water and the excessive loss of lubricant. The sealing
See Seals
rings are matched to the low radial dimensions of needle roller
See Rolling element
bearings. They are very easy to fit, since they are simply pressed into the housing
See Mounting dimenstions
bore.

 
 

   

Figure 13
Sealing of the bearing position with a sealing
See Seals
ring G

Symbole/00016410_mei_in_0k_0k.gif  Needle roller bearing
See Rolling bearing
with ribs on the outer ring, open
Symbole/00016411_mei_in_0k_0k.gif  Sealing ring G

 

imageref_22293511691_All.gif

 
 

Speeds

 
 

The product tables generally give two speeds for the bearings ➤ dimension table:

 
 
  • the kinematic limiting speed nG
  • the thermal speed rating nϑr.
 
 

Limiting speeds

imageref_17757187211_All.gif   The limiting speed nG is the kinematically permissible speed of the bearing. Even under favourable mounting and operating conditions, this value should not be exceeded without prior consultation with Schaeffler    ➤ link.  
  The values given in the product tables are valid for oil
Fluid lubricant with a mineral oil and/or synthetic oil base, usually with active ingredients or additives.
lubrication
Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.

See
Lubrication method
Lubrication condition
Recirculating lubrication
Lubrication technology
One-off lubrication
Hydrodynamic lubrication
Lubricant change intervall
Lubricant change
Lubricant
Lubricant paste
Oil
Grease
Lubrication film
Lubrication system
in the case of bearings without seals
Elements intended to prevent the ingress of gaseous, fluid and solid materials through the gaps formed by adjacent components whilst stationary or moving.

See
Seal
Operating life
Friction
and for grease
See
Lubricant
Grease cartridge
Fatty acids
lubrication
Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.

See
Lubrication method
Lubrication condition
Recirculating lubrication
Lubrication technology
One-off lubrication
Hydrodynamic lubrication
Lubricant change intervall
Lubricant change
Lubricant
Lubricant paste
Oil
Grease
Lubrication film
Lubrication system
where bearings are supplied greased and with seals.
 

Values for grease
See
Lubricant
Grease cartridge
Fatty acids
lubrication

 

For grease
See
Lubricant
Grease cartridge
Fatty acids
lubrication, 60% of the value stated in the product tables is permissible in the case of aligning needle roller
See Rolling element
bearings.

 
 

Reference speeds

nϑr is used to calculate nϑ

 

The thermal speed rating nϑr is not an application-oriented speed limit, but is a calculated ancillary value for determining the thermally safe operating speed nϑ    ➤ link.

 

Bearings with contact seals

 

For bearings with contact seals, no reference speeds are defined in accordance with DIN ISO 15312:2004. As a result, only the limiting speed nG is given in the product tables for these bearings.

 
 

Noise

 
 

Schaeffler Noise Index

 

The Schaeffler Noise Index (SGI) is not yet available for this bearing type    ➤ link. The data for these bearing series will be introduced and updated in stages.

 
 

Temperature range

 
 

The operating temperature
A measured relubrication interval can be achieved within given limits. The lubricant should be sufficiently thermally stable at the upper operating temperature and should not be too thick at the lower operating temperature.
of the bearings is limited by:

 
 
  • the dimensional stability of the bearing rings and rolling elements
  • the cage
  • the lubricant
  • the seals.
 
 

 

Possible operating temperatures of needle roller
See Rolling element
bearings with ribs ➤ Table 1

 
   
Table 1
Permissible temperature ranges
 

Operating temperature
Needle roller bearings with or without ribs,
aligning needle roller
See Rolling element
bearings
open bearings
sealed bearings,
aligning needle
roller bearings
with plastic cage
imageref_19988082955_All.gif
   
–30 °C to +120 °C
–20 °C to +100 °C
limited by the lubricant, seal
Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary
material and
the plastic support ring
–20 °C to +120 °C

 
imageref_18348417035_All.gif   In the event of anticipated temperatures which lie outside the stated values, please contact Schaeffler.  
 

Cages

 

Solid cages made from polyamide PA66 and sheet steel are used as standard

 

The standard cages are made from sheet steel or plastic (polyamide PA66). Bearings with a plastic cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
have the suffix TV. Aligning needle roller
See Rolling element
bearings are fitted with sheet steel cages.

 
 

Internal clearance

 
 

Radial internal clearance

The standard is CN

 

Needle roller bearings with an inner ring are manufactured as standard with radial internal clearance CN (normal) ➤ Table 2. CN is not stated in the designation.

 
imageref_18348417035_All.gif   For bearings with ribs on the outer ring, certain sizes are also available by agreement with the larger internal clearance C3.  
imageref_17757201419_All.gif   The values for radial internal clearance in bearings with an inner ring correspond to DIN 620-4:2004 (ISO 5753-1:2009) ➤ Table 2. They are valid for bearings which are free from load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
and measurement forces (without elastic deformation).
 
 

Bearings with inner ring

   

Bearings with inner ring

Table 2
Radial internal clearance of needle roller
See Rolling element
bearings with inner ring
 

Nominal bore diameter
Radial internal clearance
d
CN
(Group N)
C3
(Group 3)
mm
μm
μm
over
incl.
min.
max.
min.
max.
- 24
20
45
35
60
24
30
20
45
35
60
30
40
25
50
45
70
40
50
30
60
50
80
50
65
40
70
60
90
65
80
40
75
65
100
80
100
50
85
75
110
100
120
50
90
85
125
120
140
60
105
100
145
continued ▼

 
   
Table 3
Radial internal clearance of needle roller
See Rolling element
bearings with inner ring
 

Nominal bore diameter
Radial internal clearance
d
CN
(Group N)
C3
(Group 3)
mm
μm
μm
over
incl.
min.
max.
min.
max.
140
160
70
120
115
165
160
180
75
125
120
170
180
200
90
145
140
195
200
225
105
165
160
220
225
250
110
175
170
235
250
280
125
195
190
260
280
315
130
205
200
275
315
355
145
225
225
305
355
400
190
280
280
370
400
450
210
310
310
410
450
500
220
330
330
440
continued ▲

 
 

Enveloping circle diameter Fw for bearings without an inner ring

In the case of bearings without an inner ring, the enveloping circle diameter is used

 

In the case of bearings without inner ring, the dimension for the enveloping circle diameter Fw is used instead of the radial internal clearance. The enveloping circle is the inner inscribed circle of the needle rollers
Cylindrical rolling elements with a high length/diameter ratio (DIN 5402 Part 3)
in clearance-free contact with the outer raceway. For bearings before fitting, the enveloping circle Fw is in the tolerance class F6. Deviations ➤ Table 4.

 
   
Table 4
Deviations for the enveloping circle diameter
 

Enveloping
circle diameter Fw
Tolerance class F6
Tolerance class F8
mm
Tolerance for enveloping circle diameter Fw
upper deviation
lower deviation
upper deviation
lower deviation
over
incl.
 μm
 μm
 μm
 μm
3
6
+18
+10
+28
+10
6
10
+22
+13
+35
+13
10
18
+27
+16
+43
+16
18
30
+33
+20
+53
+20
30
50
+41
+25
+64
+25
50
80
+49
+30
+76
+30
80
120
+58
+36
+90
+36
120
180
+68
+43
+106
+43
180
250
+79
+50
+122
+50
250
315
+88
+56
+137
+56
315
400
+98
+62
+151
+62
400
500
+108
+68
+165
+68

 
 

Bearings without ribs on the outer ring

imageref_17757187211_All.gif   If the enveloping circle is to be in tolerance class F6, the outer ring/ needle roller
See Rolling element
cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
assembly as a matched pair (as delivered) must not be interchanged with parts from other matched pairs during mounting of the bearings.
 
 

Dimensions, tolerances

 
 

Dimension standards

imageref_17757201419_All.gif   The main dimensions of needle roller
See Rolling element
bearings correspond to ISO 15:2017. The main dimensions of types RNA48, NA48, RNA49, NA49, RNA69, NA69 correspond to DIN 617:2008 and ISO 1206:2001.
 
  Nominal dimensions of needle roller
See Rolling element
bearings with ribs➤ dimension table. 
 
 

Chamfer dimensions

imageref_17757201419_All.gif   The limiting dimensions for chamfer dimensions correspond to DIN 620‑6:2004. The maximum chamfer dimensions for the inner rings to DIN 620-6:2004 must be taken into consideration. Overview and limiting values   ➤ section. Nominal value of chamfer dimension ➤ dimension table.  
 

Tolerances

imageref_17757201419_All.gif   The tolerances
See
Running accuracy
Dimensional accuracy
for the dimensional and running accuracy
Measured in terms of radial runout and axial runout, due to the dimensional and geometrical tolerances of the bearing in motion, defined according to DIN
of needle roller
See Rolling element
bearings correspond to ISO 492:2014. This excludes the types RNA48, NA48, RNA49, NA49, RNA69, NA69 and aligning needle roller
See Rolling element
bearings; the dimensional and running tolerances
See
Running accuracy
Dimensional accuracy
of these bearings correspond to ISO 1206:2001. Needle roller
See Rolling element
bearings with ribs are available by agreement with increased dimensional, geometrical and running accuracy
Measured in terms of radial runout and axial runout, due to the dimensional and geometrical tolerances of the bearing in motion, defined according to DIN
(suffix P5). This excludes the outside diameter and the width of the outer cup in aligning needle roller
See Rolling element
bearings. The width has a tolerance of ±0,5 mm.
 
 

Suffixes

 
 

For a description of the suffixes used in this chapter ➤ Table 5 and medias interchange http://www.schaeffler.de/std/1D52.

 
   
Table 5
Suffixes and corresponding descriptions
 

Suffix
Description of suffix
ASR1
Lubrication hole and lubrication
Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.

See
Lubrication method
Lubrication condition
Recirculating lubrication
Lubrication technology
One-off lubrication
Hydrodynamic lubrication
Lubricant change intervall
Lubricant change
Lubricant
Lubricant paste
Oil
Grease
Lubrication film
Lubrication system
groove in the outer ring, dependent on the size
Standard
C3
Radial internal clearance C3 (larger than normal)
Special design, available by agreement
D
Bearing with improved steel cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
for downsizing option
Standard
IS1
Lubrication hole in the inner ring, dependent
on the size
P5
Bearing with high dimensional, geometrical and running accuracy
Special design, available by agreement
RSR
Contact seal
Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary
on one side (lip seal)
Standard
TV
Bearing with cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
made from glass fibre reinforced polyamide PA66
TW
Bearing with cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
made from glass fibre reinforced polyamide PA66 and two short needle rollers
Cylindrical rolling elements with a high length/diameter ratio (DIN 5402 Part 3)
per cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
pocket
Available by agreement
XL
X-life bearing
Standard
ZW
Double row design, dependent on the size
2RSR
Contact seal
Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary
on both sides (lip seal)

 
 

Structure of bearing designation

 

Examples of composition of bearing designation

 

The designation
Identification of a bearing by letters and numbers, indicating, for example, the series, dimensional series or size code, bore diameter, bearing design and information such as Corrotect plating or length of guideways
of bearings follows a set model. Examples ➤ Figure 14 to ➤ Figure 17. The composition of designations is subject in part to DIN 623-1    ➤ Figure.

 
 

   

Figure 14
Single row needle roller bearing
See Rolling bearing
with ribs on the outer ring, without inner ring, open: designation
Identification of a bearing by letters and numbers, indicating, for example, the series, dimensional series or size code, bore diameter, bearing design and information such as Corrotect plating or length of guideways
structure


 

imageref_22293515147_en.gif

 
   

Figure 15
Single row needle roller bearing
See Rolling bearing
with ribs on the outer ring, without inner ring, sealed on both sides: designation
Identification of a bearing by letters and numbers, indicating, for example, the series, dimensional series or size code, bore diameter, bearing design and information such as Corrotect plating or length of guideways
structure


 

imageref_22293520523_en.gif

 
   

Figure 16
Double row needle roller bearing
See Rolling bearing
without ribs on the outer ring, without inner ring, open: designation
Identification of a bearing by letters and numbers, indicating, for example, the series, dimensional series or size code, bore diameter, bearing design and information such as Corrotect plating or length of guideways
structure


 

imageref_22293704459_en.gif

 
   

Figure 17
Aligning needle roller bearing
See Rolling bearing
with inner ring: designation
Identification of a bearing by letters and numbers, indicating, for example, the series, dimensional series or size code, bore diameter, bearing design and information such as Corrotect plating or length of guideways
structure


 

imageref_22293712267_en.gif

 
 

Dimensioning

 
 

Equivalent dynamic bearing load

P = Fr under purely radial load
A force which acts at an angle of b = 0°.
of constant magnitude and direction

 

The basic rating life
The basic rating life is the life reached or exceeded by 90% of a sufficiently large group of apparently identical bearings before the first evidence of material fatigue develops
equation L = (Cr/P)p used in the dimensioning of bearings under dynamic load
The term dynamic indicates that the operating condition is with the bearing rotating. This is not a variable load.
assumes a load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
of constant magnitude and direction. In radial bearings, this is a purely radial load Fr. If this condition is met, the bearing load Fr is used in the rating life
The basic rating life is the life reached or exceeded by 90% of a sufficiently large group of apparently identical bearings before the first evidence of material fatigue develops
equation for P (P = Fr) ➤ Equation 1.

 
imageref_17757187211_All.gif   Needle roller bearings and aligning needle roller
See Rolling element
bearings are non-locating bearings and may only be subjected to radial load.
 

Equation 1
Equivalent dynamic load
 
imageref_9007199294669579_All.gif

Legend

 
P
 N
Equivalent dynamic bearing load
Fr
 N
Radial load.
 
 

Equivalent static bearing load

 

For needle roller
See Rolling element
bearings subjected to static load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
➤ Equation 2.

 

Equation 2
Equivalent static load
 
imageref_9007199294671243_All.gif

Legend

 
P0
 N
Equivalent static bearing load
F0r
 N
Largest radial load
A force which acts at an angle of b = 0°.
present (maximum load).
 
 

Static load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
safety factor

S0 = C0/P0

 

In addition to the basic rating life L (L10h), it is also always necessary to check the static load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
safety factor S0
 ➤ Equation 3.

 

Equation 3
Static Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.See Contact surface safety factor
 
imageref_27021597814984331_All.gif

Legend

 
S0
Static load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
safety factor
C0
 N
Basic static load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
rating
P0
 N
Equivalent static bearing load.
 
 

Minimum load

 

In order to prevent damage
Loss of essential or required characteristics in equipment, machinery or plant or their component parts.
due to slippage, a minimum radial load
A force which acts at an angle of b = 0°.
of P > C0r/60 is required

 

In order that no slippage occurs between the contact partners, the needle roller
See Rolling element
bearings must be constantly subjected to a sufficiently high load. Based on experience, a minimum radial load
A force which acts at an angle of b = 0°.
of the order of P > C0r/60 is thus necessary. In most cases, however, the radial load
A force which acts at an angle of b = 0°.
is already higher than the requisite minimum load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
due to the weight of the supported parts and the external forces.

 
imageref_18348417035_All.gif   If the minimum radial load
A force which acts at an angle of b = 0°.
is lower than indicated above, please consult Schaeffler.
 
 

Design of bearing arrangements

 

Support bearing rings over their entire circumference and width

 

In order to allow full utilisation of the load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
carrying capacity of the bearings and achieve the requisite rating life, the bearing rings must be rigidly and uniformly supported by means of contact surfaces
The effective surface is the surface which separates the object from its surrounding medium.The actual surface is the approximate image from measuring technology of the ideal geometric surface. Note: various measuring processes or measuring conditions (e.g. stylus radius) can give different actual surfaces.The geometric surface is an ideal surface whose nominal form is defined by a drawing or other technical documentation. See DIN 4760 for further details.

See
Surface protection
Surface tension
over their entire circumference and over the entire width of the raceway. Support can be provided by means of a cylindrical seating surface. The seating and contact surfaces
The effective surface is the surface which separates the object from its surrounding medium.The actual surface is the approximate image from measuring technology of the ideal geometric surface. Note: various measuring processes or measuring conditions (e.g. stylus radius) can give different actual surfaces.The geometric surface is an ideal surface whose nominal form is defined by a drawing or other technical documentation. See DIN 4760 for further details.

See
Surface protection
Surface tension
should not be interrupted by grooves, holes or other recesses. The accuracy
Deviation of the actual dimension from the nominal dimension as described by tolerances. For monorail systems, the parallel deviation of the reference surfaces within given tolerances.

See
Running accuracy
Dimensional accuracy
of mating parts must meet specific requirements ➤ Table 6 to ➤ Table 9.

 
 

Radial location

For secure radial location, tight fits are necessary

 

Needle roller bearings with an inner ring are radially located by means of fits on the shaft and in the housing. In addition to supporting the rings adequately, the bearings must also be securely located in a radial direction, to prevent creep of the bearing rings on the mating parts under load. This is generally achieved by means of tight fits between the bearing rings and the mating parts. If the rings are not secured adequately or correctly, this can cause severe damage
Loss of essential or required characteristics in equipment, machinery or plant or their component parts.
to the bearings and adjacent machine parts. Influencing factors, such as the conditions of rotation, magnitude of the load, internal clearance, temperature conditions, design of the mating parts, mounting and dismounting options etc., must be taken into consideration in the selection of fits.

 
imageref_17757187211_All.gif   If shock type loads occur, tight fits (transition fit or interference fit) are required to prevent the rings from coming loose at any point. Clearance, transition or interference fits ➤ Table and ➤ Table .  
 

The following information provided in Technical principles must be taken into consideration in the design of bearing arrangements:

 
   
 

Axial location – location methods

The bearings must also be securely located in an axial direction

 

As a tight fit alone is not normally sufficient to also locate the bearing rings securely on the shaft and in the housing
See Mounting dimenstions
bore in an axial direction, this must usually be achieved by means of an additional axial location or retention method. The axial location of the bearing rings must be matched to the type of bearing arrangement. Shaft and housing
See Mounting dimenstions
shoulders, housing
See Mounting dimenstions
covers, nuts, spacer rings and retaining rings etc., are fundamentally suitable ➤ Figure 18 and ➤ Figure 19.

 
   

Figure 18
Axial location of the bearing rings in bearings with ribs on the outer ring

Symbole/00016410_mei_in_0k_0k.gif  Retaining ring

 

imageref_22320649099_All.gif

 
   

Figure 19
Axial location of the bearing rings in bearings without ribs on the outer ring

Symbole/00016410_mei_in_0k_0k.gif  Retaining ring
Symbole/00016411_mei_in_0k_0k.gif  Axial washer

 

imageref_22293730827_All.gif

 
 

Axial guidance of the needle roller
See Rolling element
and cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
assemblies in bearings without ribs on the outer ring

imageref_17757187211_All.gif   The needle roller
See Rolling element
and cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
assemblies must be axially guided on lateral, burr-free running surfaces. The running surfaces
The effective surface is the surface which separates the object from its surrounding medium.The actual surface is the approximate image from measuring technology of the ideal geometric surface. Note: various measuring processes or measuring conditions (e.g. stylus radius) can give different actual surfaces.The geometric surface is an ideal surface whose nominal form is defined by a drawing or other technical documentation. See DIN 4760 for further details.

See
Surface protection
Surface tension
for the cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
must be precision machined (Ra 2) and resistant to wear. The product tables give the maximum value of the radius ra, the diameters of the abutment shoulders da, Da and the dimension db, Db for axial guidance of the needle roller
See Rolling element
and cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
assembly. Mounting dimensions
Dimensions such as shaft diameter or hole distances, for example of bearings and guideways, which influence fitting for correct functioning
➤ dimension table.
 
 

Tolerances of the housing
See Mounting dimenstions
bore for aligning needle roller
See Rolling element
bearings

 

   
Table 6
Tolerance classes and surface design for housings, as a function of the material – for aligning needle roller
See Rolling element
bearings
 

Housing material
Bore tolerance
to ISO 286-2
Roundness tolerance
Parallelism tolerance
Recommended mean roughness
Regular or irregular repeat deviation from an ideal geometric profile.
value
Ramax (Rzmax)
max.
max.
μm
Steel or cast iron
N6
IT5/2
IT5/2
0,8 (4)
Light metal
R6

 
 

Dimensional, geometrical and running accuracy
Measured in terms of radial runout and axial runout, due to the dimensional and geometrical tolerances of the bearing in motion, defined according to DIN
of cylindrical bearing seats

A minimum of IT6 should be provided for the shaft seat and a minimum of IT7 for the housing
See Mounting dimenstions
seat

 

The accuracy
Deviation of the actual dimension from the nominal dimension as described by tolerances. For monorail systems, the parallel deviation of the reference surfaces within given tolerances.

See
Running accuracy
Dimensional accuracy
of the cylindrical bearing seat on the shaft and in the housing
See Mounting dimenstions
should correspond to the accuracy
Deviation of the actual dimension from the nominal dimension as described by tolerances. For monorail systems, the parallel deviation of the reference surfaces within given tolerances.

See
Running accuracy
Dimensional accuracy
of the bearing used. For needle roller
See Rolling element
bearings with ribs with the tolerance class Normal, the shaft seat should correspond to a minimum of standard tolerance grade IT6 and the housing
See Mounting dimenstions
seat to a minimum of IT7. Guide values for the geometrical and positional tolerances
See
Running accuracy
Dimensional accuracy
of the bearing seating surfaces ➤ Table 7, tolerances t1 to t3 in accordance with    ➤ Figure. Numerical values for IT grades ➤ Table 8.

 
   
Table 7
Guide values for the geometrical and positional tolerances
See
Running accuracy
Dimensional accuracy
of bearing seating surfaces
 

Bearing
tolerance class
Bearing seating surface
Standard tolerance grades to ISO 286-1
(IT grades)
to ISO 492
to DIN 620
Diameter tolerance
Roundness tolerance
Parallelism tolerance
Total axial runout tolerance of abutment shoulder
t1
t2
t3
Normal
PN (P0)
Shaft
IT6 (IT5)
Circumferential load
IT4/2
Circumferential load
IT4/2
IT4
Point load
IT5/2
Point load
IT5/2
Housing
IT7 (IT6)
Circumferential load
IT5/2
Circumferential load
IT5/2
IT5
Point load
IT6/2
Point load
IT6/2
- P5
Shaft
IT5
Circumferential load
IT2/2
Circumferential load
IT2/2
IT2
Point load
IT3/2
Point load
IT3/2
Housing
IT6
Circumferential load
IT3/2
Circumferential load
IT3/2
IT3
Point load
IT4/2
Point load
IT4/2

 
   
Table 8
Numerical values for ISO standard tolerances
See
Running accuracy
Dimensional accuracy
(IT grades) to ISO 286-1:2010
 

IT grade
Nominal dimension in mm
over
3
6
10
18
30
50
80
120
180
250
315
400
incl.
6
10
18
30
50
80
120
180
250
315
400
500
Values in μm
IT2

   
1,5
1,5
2
2,5
2,5
3
4
5
7
8
9
10
IT3

   
2,5
2,5
3
4
4
5
6
8
10
12
13
15
IT4

   
4
4
5
6
7
8
10
12
14
16
18
20
IT5

   
5
6
8
9
11
13
15
18
20
23
25
27
IT6

   
8
9
11
13
16
19
22
25
29
32
36
40
IT7

   
12
15
18
21
25
30
35
40
46
52
57
63

 
 

Roughness of cylindrical bearing seating surfaces

Ra must not be too high

 

The roughness
Regular or irregular repeat deviation from an ideal geometric profile.
of the bearing seats must be matched to the tolerance class of the bearings. The mean roughness
Regular or irregular repeat deviation from an ideal geometric profile.
value Ra must not be too high, in order to maintain the interference loss within limits. The shafts must be ground, while the bores must be precision turned. Guide values as a function of the IT grade of bearing seating surfaces
The effective surface is the surface which separates the object from its surrounding medium.The actual surface is the approximate image from measuring technology of the ideal geometric surface. Note: various measuring processes or measuring conditions (e.g. stylus radius) can give different actual surfaces.The geometric surface is an ideal surface whose nominal form is defined by a drawing or other technical documentation. See DIN 4760 for further details.

See
Surface protection
Surface tension
➤ Table 9.

 
 

   
Table 9
Roughness values for cylindrical bearing seating surfaces – guide values
 

Nominal diameter
of the bearing seat
d (D)
Recommended mean roughness
Regular or irregular repeat deviation from an ideal geometric profile.
value
for ground bearing seats
Ramax
mm
μm
Diameter tolerance (IT grade)
over
incl.
IT7
IT6
IT5
IT4
- 80
1,6
0,8
0,4
0,2
80
500
1,6
1,6
0,8
0,4

 
 

Mounting dimensions

The contact surfaces
The effective surface is the surface which separates the object from its surrounding medium.The actual surface is the approximate image from measuring technology of the ideal geometric surface. Note: various measuring processes or measuring conditions (e.g. stylus radius) can give different actual surfaces.The geometric surface is an ideal surface whose nominal form is defined by a drawing or other technical documentation. See DIN 4760 for further details.

See
Surface protection
Surface tension
for the rings must be of sufficient height

 

The mounting dimensions
Dimensions such as shaft diameter or hole distances, for example of bearings and guideways, which influence fitting for correct functioning
of the shaft and housing
See Mounting dimenstions
shoulders, and spacer rings etc., must ensure that the contact surfaces
The effective surface is the surface which separates the object from its surrounding medium.The actual surface is the approximate image from measuring technology of the ideal geometric surface. Note: various measuring processes or measuring conditions (e.g. stylus radius) can give different actual surfaces.The geometric surface is an ideal surface whose nominal form is defined by a drawing or other technical documentation. See DIN 4760 for further details.

See
Surface protection
Surface tension
for the bearing rings are of sufficient height. However, they must also reliably prevent rotating parts of the bearing from grazing stationary parts. The abutment shoulders (shaft, housing) should be perpendicular to the bearing axis.

 
imageref_17757201419_All.gif   The transition from the bearing seat to the abutment shoulder
Shoulder in the surrounding structure for transfer of forces and location of components.
must be designed with rounding
See Mounting dimensions
to DIN 5418 or an undercut to DIN 509.
 

Chamfer dimensions

 

The chamfer dimensions r are given in the product tables. These dimensions are limiting dimensions (minimum dimensions); the actual values should not be lower than specified. The overlap between the snap rings and the end faces of the bearing rings must be sufficiently large.

 
 

Raceway for bearings without an inner ring (direct bearing arrangement)

The raceway must be suitable as a rolling bearing
Ready-to-fit machine element, often defined in standards, for transmitting movements, loads and tilting moments with a high level of efficiency; rolling bearings consist of rolling elements, cages and raceways on rings, guideways or carriages as well as lubricant and, if necessary, seals and accessories
raceway

 

In the case of needle roller
See Rolling element
bearings without an inner ring, the rolling element
Point or rotationally symmetrical bodies for transmitting loads between raceways.
raceway on the shaft must be hardened and ground. Tolerances
See
Running accuracy
Dimensional accuracy
and surface designs are shown in ➤ Table 10. The surface hardness
Resistance of a body to indentation by another body; hardness is either intrinsic or is achieved by heat treatment processes (steel) and/or thermochemical diffusion; for rolling bearings, hardness is measured in Rockwell (HRC) or Vickers (HV)
of the raceway must be 670 HV to 840 HV, the hardening depth CHD or SHD must be sufficiently large.

 
imageref_17757187211_All.gif   The values in the tables are valid for housing
See Mounting dimenstions
tolerances
See
Running accuracy
Dimensional accuracy
up to K7 Ⓔ. For tighter bores, the operating clearance
The amount by which the bearing rings in a fitted bearing can be moved in the radial or axial direction from one extreme position to the other.
should be checked by either calculation or measurement.
 
 

   
Table 10
Tolerance classes and surface design of raceways for needle roller
See Rolling element
bearings without an inner ring
 

Shaft
diameter
Shaft
tolerance1)
Design of raceway
Roundness tolerance
Parallelism tolerance
Recommended mean roughness
Regular or irregular repeat deviation from an ideal geometric profile.
value
Nominal dimension
Operating clearance
Ramax (Rzmax)
mm
over
incl.
small
normal
large
max.
max.
μm
- 65
k5
h5
g6
IT3
IT3
0,1 (0,4)
65
80
k5
h5
f6
80
120
k5
g5
f6
0,15 (0,63)
120
160
k5
g5
f6
0,2 (1)
160
180
k5
g5
e6
180
200
j5
g5
e6
200
250
j5
f6
e6
250
315
h5
f6
e6
315
415
g5
f6
d6

 
 
______
 1    The envelope requirement Ⓔ applies.
 
 

Shaft raceway to DIN 617

imageref_17757187211_All.gif   If the surface of the shaft raceway is produced to DIN 617, the basic load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
ratings Cr in the product tables must be reduced by 15% ➤ section .
 
 

Steels for the raceway

 

Through hardening steels

imageref_17757201419_All.gif   Through hardening steels in accordance with ISO 683-17 (e.g. 100Cr6) are suitable as materials for rolling bearing
Ready-to-fit machine element, often defined in standards, for transmitting movements, loads and tilting moments with a high level of efficiency; rolling bearings consist of rolling elements, cages and raceways on rings, guideways or carriages as well as lubricant and, if necessary, seals and accessories
raceways in direct bearing arrangements. These steels can also be surface layer hardened.
 
 

Case hardening steels

imageref_17757201419_All.gif   Case hardening steels must correspond to DIN EN ISO 683-17 (e.g. 17MnCr5, 18CrNiMo7-6) or EN 10084 (e.g. 16MnCr5).  
 

Steels for inductive surface layer hardening

imageref_17757201419_All.gif   For flame and induction hardening, steels in accordance with DIN EN ISO 683-17 (e.g. C56E2, 43CrMo4) or DIN 17212 (e.g. Cf53) should be used.  
 

Raceway hardness
Resistance of a body to indentation by another body; hardness is either intrinsic or is achieved by heat treatment processes (steel) and/or thermochemical diffusion; for rolling bearings, hardness is measured in Rockwell (HRC) or Vickers (HV)
of less than 670 HV

imageref_17757187211_All.gif   If the raceway fulfils the requirements for rolling bearing
Ready-to-fit machine element, often defined in standards, for transmitting movements, loads and tilting moments with a high level of efficiency; rolling bearings consist of rolling elements, cages and raceways on rings, guideways or carriages as well as lubricant and, if necessary, seals and accessories
materials but the raceway hardness
Resistance of a body to indentation by another body; hardness is either intrinsic or is achieved by heat treatment processes (steel) and/or thermochemical diffusion; for rolling bearings, hardness is measured in Rockwell (HRC) or Vickers (HV)
is less than 670 HV, the load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
on the bearing arrangement
Arrangement of bearings, for example locating/locating, semi-locating/semi-locating, non-locating/non-locating, or semi-locating bearings in tandem, O or X arrangement
cannot be as high as the full load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
carrying capacity of the bearing. In order to determine the dynamic and static load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
carrying capacity of the bearing arrangement, the basic dynamic load
The term dynamic indicates that the operating condition is with the bearing rotating. This is not a variable load.
rating C of the bearings must be multiplied by the reduction factor fH (dynamic hardness
Resistance of a body to indentation by another body; hardness is either intrinsic or is achieved by heat treatment processes (steel) and/or thermochemical diffusion; for rolling bearings, hardness is measured in Rockwell (HRC) or Vickers (HV)
factor) and the basic static load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
rating C0r by the reduction factor fH0 (static hardness
Resistance of a body to indentation by another body; hardness is either intrinsic or is achieved by heat treatment processes (steel) and/or thermochemical diffusion; for rolling bearings, hardness is measured in Rockwell (HRC) or Vickers (HV)
factor) ➤ Figure 20 and ➤ Figure 21.
 
 

   

Figure 20
Dynamic hardness
Resistance of a body to indentation by another body; hardness is either intrinsic or is achieved by heat treatment processes (steel) and/or thermochemical diffusion; for rolling bearings, hardness is measured in Rockwell (HRC) or Vickers (HV)
factor at reduced hardness
Resistance of a body to indentation by another body; hardness is either intrinsic or is achieved by heat treatment processes (steel) and/or thermochemical diffusion; for rolling bearings, hardness is measured in Rockwell (HRC) or Vickers (HV)
of raceways/rolling elements

fH =  dynamic hardness
Resistance of a body to indentation by another body; hardness is either intrinsic or is achieved by heat treatment processes (steel) and/or thermochemical diffusion; for rolling bearings, hardness is measured in Rockwell (HRC) or Vickers (HV)
factor
HV, HRC =  surface hardness

 

imageref_9007203347547659_All.gif

 
   

Figure 21
Static hardness
Resistance of a body to indentation by another body; hardness is either intrinsic or is achieved by heat treatment processes (steel) and/or thermochemical diffusion; for rolling bearings, hardness is measured in Rockwell (HRC) or Vickers (HV)
factor at reduced hardness
Resistance of a body to indentation by another body; hardness is either intrinsic or is achieved by heat treatment processes (steel) and/or thermochemical diffusion; for rolling bearings, hardness is measured in Rockwell (HRC) or Vickers (HV)
of raceways/rolling elements

fH0 =  static hardness
Resistance of a body to indentation by another body; hardness is either intrinsic or is achieved by heat treatment processes (steel) and/or thermochemical diffusion; for rolling bearings, hardness is measured in Rockwell (HRC) or Vickers (HV)
factor
HV, HRC =  surface hardness

 

imageref_22094324363_All.gif

 
 

Determining the case hardening depth

Approximation value for case hardening depth

 

An approximation value for determining the minimum hardness depth
This depends essentially on the rolling element diameter, the material stress, the core strength and the hardening process
is given in ➤ Equation 4. The reference value for the load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
present is the equivalent stress
Mechanical, mechanical-thermal, mechanical-chemical or tribological influences acting individually or jointly on a component
in accordance with the distortion energy hypothesis (DEH) as a function of the rolling element
Point or rotationally symmetrical bodies for transmitting loads between raceways.
diameter Dw and the magnitude of the load.

 

Equation 4
Case hardening depth
 
imageref_19497382667_All.gif

Legend

 
CHD
 mm
Case hardening depth
Dw
 mm
Rolling element diameter.
 
imageref_17757187211_All.gif   The local hardness
Resistance of a body to indentation by another body; hardness is either intrinsic or is achieved by heat treatment processes (steel) and/or thermochemical diffusion; for rolling bearings, hardness is measured in Rockwell (HRC) or Vickers (HV)
must always be above the local requisite hardness, which can be calculated from the equivalent stress.
 
 

Determining the surface hardening depth

imageref_17757187211_All.gif   In these surface hardening methods, the load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
and contact geometry must be taken into consideration when determining the requisite hardening depth.
 
 

  For calculation of the surface hardening depth SHD ➤ Equation:

Equation 5
Surface hardening depth
 
imageref_10856257163_All.gif

Legend

 
SHD
 mm
Surface hardening depth
Dw
 mm
Rolling element diameter
Rp0,2
 N/mm2
Yield point of base material.
 
 

Mounting and dismounting

 
imageref_17757187211_All.gif   The mounting and dismounting options for needle roller
See Rolling element
bearings with ribs, by thermal, hydraulic or mechanical methods, must be taken into consideration in the design of the bearing position.
 
 

Aligning needle roller
See Rolling element
bearings

Mounting using pressing mandrel

 

Due to the drawn outer cup, the bearings must be mounted using a special pressing mandrel ➤ link . The marked side of the bearing should be in contact with the flange of the mandrel. A toroidal ring on the mandrel holds the bearing securely on the mandrel.

 
 

Schaeffler Mounting Handbook

Rolling bearings must be handled with great care

 

Rolling bearings are well-proven precision machine elements for the design of economical and reliable bearing arrangements, which offer high operational security. In order that these products can function correctly and achieve the envisaged operating life
See Life, rating
without detrimental effect, they must be handled with care.

 
imageref_21602891659_en.gif   The Schaeffler Mounting Handbook MH 1 gives comprehensive infor­mation about the correct storage, mounting, dismounting and mainten­ance of rotary rolling bearings http://www.schaeffler.de/std/1D53. It also provides information which should be observed by the designer, in relation to the mounting, dismounting and maintenance
Inspection, maintenance and repair of equipment and machines.
of bearings, in the original design of the bearing position. This book is available from Schaeffler on request.
 
 

Legal notice regarding data freshness

 

The further development of products may also result in technical changes to catalogue products

 

Of central interest to Schaeffler is the further development and opti­misation of its products and the satisfaction of its customers. In order that you, as the customer, can keep yourself optimally informed about the progress that is being made here and with regard to the current technical status of the products, we publish any product changes which differ from the printed version in our electronic product catalogue.

 
imageref_18350433803_All.gif   We therefore reserve the right to make changes to the data and illus­trations in this catalogue. This catalogue reflects the status at the time of printing. More recent publications released by us (as printed or digital media) will automatically precede this catalogue if they involve the same subject. Therefore, please always use our electronic product catalogue to check whether more up-to-date information or modification notices exist for your desired product.  
 

Further information

 

In addition to the data in this chapter, the following chapters in Technical principles must also be observed in the design of bearing arrangements:

 
   
   
  
Schaeffler applies cookies to secure an optimal use. With the further use of this website you accept the application of cookies.  Further information