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Double row cylindrical roller bearings
 

Double row full complement
Design of rolling bearing with the largest possible number of rolling elements (balls or rollers) by the omission of cages or cage elements
cylindrical roller bearings are suitable where:

 
 
  • bearing arrangements are subjected to particularly high radial loads ➤ section
  • not only particularly high radial forces but also high axial loads from one or both directions must be supported by the bearing position (semi-locating or locating bearing
    Bearing capable of transmitting axial loads from both directions and radial loads
    function) ➤ section
  • bearing arrangements must have very high rigidity
  • Axial displacements of the shaft relative to the housing
    See Mounting dimenstions
    must be aompensated without constraint in the bearing (in the case of bearings with a non-locating or semi-locating bearing
    Bearing which transmits axial loads from one side and radial loads or axial loads from one side only
    function) ➤ section
  • very high radial loads occur at lower speeds, i.e. the bearings do not need to achieve speeds as high as those of cylindrical roller bearings with cage ➤ section and ➤ dimension table
  • space-saving designs are required despite very high load
  • the bearings should be separable for easier mounting (bearings with non-locating bearing
    Non-locating bearings of the longitudinal, transverse or tilting type permit displacement within the bearing requiring almost no force
    function) ➤ section and ➤ section .
 
   

Figure 1
Cylindrical roller bearing
See Rolling bearing
with cage/single row full complement
Design of rolling bearing with the largest possible number of rolling elements (balls or rollers) by the omission of cages or cage elements
bearing, double row full complement
Design of rolling bearing with the largest possible number of rolling elements (balls or rollers) by the omission of cages or cage elements
bearing, comparison of speed and 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

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

 

imageref_20910474251_All.gif

 
 

Bearing design

 
 

The standard range of double row full complement
Design of rolling bearing with the largest possible number of rolling elements (balls or rollers) by the omission of cages or cage elements
cylindrical roller bearings comprises:

 
 
  • series SL0248 and SL0249 (non-locating bearings) ➤ Figure 2
  • series SL1850 (semi-locating bearings) ➤ Figure 3
  • series SL0148 and SL0149 (locating bearings) ➤ Figure 4
  • series SL0450 and SL04 (cylindrical roller bearings with annular slots – rope sheave bearings) ➤ Figure 5
  • X-life bearings ➤ link .
 
imageref_18348417035_All.gif   In addition to the bearings described here, Schaeffler supplies double row full complement
Design of rolling bearing with the largest possible number of rolling elements (balls or rollers) by the omission of cages or cage elements
cylindrical roller bearings in other types, series and dimensions. These products are described in some cases in special publications. If necessary, please contact Schaeffler. Larger catalogue bearings ➤ GL 1.
 
 

Bearings of basic design – standard range

Key features

 

Double row full complement
Design of rolling bearing with the largest possible number of rolling elements (balls or rollers) by the omission of cages or cage elements
cylindrical roller bearings are part of the group of radial roller bearings. These bearings comprise solid outer rings, inner rings and full complement
Design of rolling bearing with the largest possible number of rolling elements (balls or rollers) by the omission of cages or cage elements
rolling element
Point or rotationally symmetrical bodies for transmitting loads between raceways.
sets. Due to the absence of a cage, the bearing can accommodate the largest possible number of rolling elements. The rollers
Barrel-shaped, tapered or cylindrical rolling elements
have profiled ends, i.e. they have a slight lateral curvature towards the ends. This modified line contact between the rolling elements and raceways prevents damaging edge stresses ➤ Figure . Bearings in the standard range differ essentially in the arrangement of the ribs on the inner ring and outer ring. Depending on the design, they are used as non-locating bearings, semi‑locating bearings or locating bearings.

 
 

Series SL0248, SL0249

Bearings with non-locating bearing
Non-locating bearings of the longitudinal, transverse or tilting type permit displacement within the bearing requiring almost no force
function

 

In bearings of these series, the inner ring has three rigid ribs, while the outer ring is without ribs ➤ Figure 2. As a result, axial displacements of the shaft relative to the housing
See Mounting dimenstions
can be compensated within certain limits. During rotational motion, length compensation occurs without constraint in the bearing between the rollers
Barrel-shaped, tapered or cylindrical rolling elements
and the raceway without ribs and is therefore practically free from friction. The maximum axial displacement
Travel in an axial direction due to axial clearance and deflection
s is given in the product tables. The bearings are used as non-locating bearings, i.e. they cannot guide the shaft axially in either direction ➤ section . The series SL0248 and SL0249 are not self-retaining (the outer ring without ribs can be removed from the bearing). As a result, the bearing parts (the inner ring with the rolling element
Point or rotationally symmetrical bodies for transmitting loads between raceways.
set and the outer ring) can be mounted separately from each other. This gives easier mounting of the bearings ➤ section .

 
 

According to DIN 5412-9:1982, which has now been withdrawn, the bearings have the following designation:

 
 
  • SL0248: NNCL48..V
  • SL0249: NNCL49..V
 
imageref_17757187211_All.gif   The bearings are held together in handling and mounting by a transport and mounting retaining device on the outer ring ➤ Figure 2. This retaining device remains in the bearing even after mounting and must not be subjected to axial load.  
   

Figure 2
Double row full complement
Design of rolling bearing with the largest possible number of rolling elements (balls or rollers) by the omission of cages or cage elements
cylindrical roller bearing – non‑locating bearing

Fr =  radial load
Symbole/00016410_mei_in_0k_0k.gif  Transport and mounting retaining device

 

imageref_20910483211_All.gif

 
 

Series SL1850

Bearings with semi-locating bearing
Bearing which transmits axial loads from one side and radial loads or axial loads from one side only
function

 

Bearings of series SL1850 (dimension series 50) have three rigid ribs on the inner ring and one rigid rib on the outer ring ➤ Figure 3. In these cylindrical roller bearings, axial displacements of the shaft relative to the housing
See Mounting dimenstions
are possible in one direction only. The maximum axial displacement
Travel in an axial direction due to axial clearance and deflection
s is given in the product tables ➤ dimension table. The bearings are used as semi-locating bearings, i.e. they can guide the shaft axially in one direction ➤ section .

 
imageref_17757187211_All.gif   The bearings are held together in handling and mounting by a transport and mounting retaining device on the outer ring ➤ Figure 3. This retaining device remains in the bearing even after mounting and must not be subjected to axial load.  
   

Figure 3
Double row full complement
Design of rolling bearing with the largest possible number of rolling elements (balls or rollers) by the omission of cages or cage elements
cylindrical roller bearing – semi‑locating bearing

Fr =  radial load
Fa =  axial load
Symbole/00016410_mei_in_0k_0k.gif  Transport and mounting retaining device

 

imageref_20910577931_All.gif

 
 

Series SL0148, SL0149

Bearings with locating bearing
Bearing capable of transmitting axial loads from both directions and radial loads
function

 

In these bearings, the inner ring has three rigid ribs and the outer ring has two rigid ribs ➤ Figure 4. Axial displacements between the shaft and housing
See Mounting dimenstions
are not possible. The bearings are used as locating bearings, i.e. they can guide the shaft axially in both directions ➤ section .

 
 

According to DIN 5412-9:1982, which has now been withdrawn, the bearings have the following designation:

 
 
  • SL0148: NNC48..V
  • SL0149: NNC49..V.
 
imageref_17757187211_All.gif   The split outer ring is held together by a transport and mounting retaining device ➤ Figure 4. This retaining device remains in the bearing even after mounting and must not be subjected to axial load.  
   

Figure 4
Double row full complement
Design of rolling bearing with the largest possible number of rolling elements (balls or rollers) by the omission of cages or cage elements
cylindrical roller bearing – locating bearing

Fr =  radial load
Fa =  axial load
Symbole/00016410_mei_in_0k_0k.gif  Retaining ring

 

imageref_20910582027_All.gif

 
 

Series SL0450..-PP and SL04..-PP – cylindrical roller bearings with annular slots

Bearings with locating bearing
Bearing capable of transmitting axial loads from both directions and radial loads
function, particularly suitable for the support of rope sheaves

 

These bearings comprise solid outer rings without ribs, inner rings with three ribs, rib-guided rolling element
Point or rotationally symmetrical bodies for transmitting loads between raceways.
sets and sealing
See Seals
rings ➤ Figure 5. The outer rings have annular slots for retaining rings. The inner rings are axially split, 1 mm wider than the outer rings and held together by a sheet metal ring. They are used as locating bearings (but can support only slight axial loads) and are used in preference for the support of rope sheaves.

 

Light series and dimension series 50

 

Cylindrical roller bearings with annular slots are available as a light series SL04..-PP and in the dimension series 50 as SL0450..-PP. The latter has a higher 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 than the light series ➤ dimension table.

 
imageref_17757210635_All.gif   Extensive information on rope sheave bearing arrangements is given in the Technical Product Information TPI 237. This publication can be requested from Schaeffler.  
   

Figure 5
Double row full complement
Design of rolling bearing with the largest possible number of rolling elements (balls or rollers) by the omission of cages or cage elements
cylindrical roller bearing
See Rolling bearing
with annular slots – locating bearing

Fr =  radial load
Fa =  axial load
Symbole/00016410_mei_in_0k_0k.gif  Slots in outer ring
Symbole/00016411_mei_in_0k_0k.gif  Sealing rings
Symbole/00016412_mei_in_0k_0k.gif  Sheet metal ring
Symbole/00016413_mei_in_0k_0k.gif  Retaining rings
Symbole/00016414_mei_in_0k_0k.gif  Rope sheave

 

imageref_20910587147_All.gif

 
 

X-life premium quality

imageref_19964530187_All.gif   Double row full complement
Design of rolling bearing with the largest possible number of rolling elements (balls or rollers) by the omission of cages or cage elements
cylindrical roller bearings of series SL1850 are available in many sizes as X-life bearings ➤ dimension table. These bearings exhibit considerably higher performance than comparable standard cylindrical roller bearings. This is achieved, for example, through the modified internal construction, the optimised contact geometry between the rollers
Barrel-shaped, tapered or cylindrical rolling elements
and raceways, the better surface quality
See DIN 55 350 part 11 and ISO 8402 for terminology and definitions.
and the optimised roller guidance and lubricant film
Layer separating the sliding or rolling partners
formation.
 
 

Advantages

 

These 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
  • a higher fatigue
    Structural changes, apparent as surface delamination, caused by a large number of overrolling movements under load
    limit load
  • lower heat generation in the bearing
  • lower lubricant
    Gaseous, fluid, consistent, plastic or solid material for reduction of friction and wear between two friction elements.
    consumption and therefore longer maintenance
    Inspection, maintenance and repair of equipment and machines.
    intervals if relubrication is carried out
  • a measurably longer operating life
    See Life, rating
    of the bearings
  • high operational security
  • compact, environmentally-friendly bearing arrangements.
 

Interchangeable with comparable standard bearings

 

Since X-life cylindrical roller bearings have the same dimensions as the corresponding standard bearings, the latter can be replaced without any problems by the higher-performance X-life bearings. The major advantages of X-life can therefore also be used for existing bearing arrangements with standard bearings.

 

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 cylindrical roller bearings include the suffix XL in the designation ➤ section and ➤ dimension table.

 
 

Areas of application

Areas of application

 

Due to their special technical features, double row full complement
Design of rolling bearing with the largest possible number of rolling elements (balls or rollers) by the omission of cages or cage elements
X-life cylindrical roller bearings are highly suitable, for example, for bearing arrangements in:

 
 
  • heavy industry (steel production)
  • power transmission (gearbox engineering)
  • processing machines and construction machinery
  • wind turbines (gearbox applications).
 
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

 
 

Depending on the type, double row full complement
Design of rolling bearing with the largest possible number of rolling elements (balls or rollers) by the omission of cages or cage elements
cylindrical roller bearings can support not only very high radial forces but also high axial loads on one or both sides:

 
 
  • The series SL0248 and SL0249 must only be subjected to radial load
  • The series SL1850 can support radial loads as well as axial loads on one side
  • The series SL0148 and SL0149 can support radial loads as well as axial loads on both sides
  • The series SL0450..-PP and SL04..50-PP can support radial loads and are suitable for the support of moderate axial loads from both directions.
 
 

Higher axial load
Force acting in the direction of the shaft.
carrying capacity of bearings with toroidal crowned roller end face

Neither wear
Undesirable change to dimensions and/or surfaces of materials due to frictional forces
nor material fatigue
Structural changes, apparent as surface delamination, caused by a large number of overrolling movements under load
occurs on the rib contact running and roller end faces

 

In the case of cylindrical roller bearings with toroidal crowned rollers
Barrel-shaped, tapered or cylindrical rolling elements
(TB design), the axial load
Force acting in the direction of the shaft.
carrying capacity has been significantly improved with the aid of new calculation and manufacturing methods. A special curvature of the roller end faces facilitates optimum contact conditions between the rollers
Barrel-shaped, tapered or cylindrical rolling elements
and ribs ➤ Figure 6. As a result, the axial contact pressures on the rib are significantly minimised and a lubricant film
Layer separating the sliding or rolling partners
capable of supporting higher loads is formed. Under standard oper­ating conditions, this completely eliminates wear
Undesirable change to dimensions and/or surfaces of materials due to frictional forces
and fatigue
Structural changes, apparent as surface delamination, caused by a large number of overrolling movements under load
at the rib contact running and roller end faces. In addition, the axial frictional torque is reduced by up to 50%. The bearing temperature during operation is therefore significantly lower. Bearings of toroidal crowned design ➤ dimension table.

 
imageref_18348417035_All.gif   By agreement, bearings of series SL1850 are available starting from a bore diameter d = 180 mm in the TB design.  
 

   

Figure 6
Contact geometry of roller end face/rib face – modified roller end faces

Symbole/00016410_mei_in_0k_0k.gif  Cylindrical roller with inner ring
Symbole/00016411_mei_in_0k_0k.gif  Detail (representation not to scale)
Symbole/00016412_mei_in_0k_0k.gif  End of roller
Symbole/00016413_mei_in_0k_0k.gif  Rib

 

imageref_22351627915_All.gif

 
 

Load ratio Fa/Fr

Ratio Fa/Fr ≦ 0,4 or 0,6

 

The bearings can support axial loads on one side by means of the ribs on the inner and outer ring ➤ Figure 7. In order to ensure problem-free running (tilting of the rollers
Barrel-shaped, tapered or cylindrical rolling elements
is prevented), they must always be subjected to radial load
A force which acts at an angle of b = 0°.
at the same time as axial load. The ratio Fa/Fr must not exceed the value 0,4. For bearings with toroidal crowned roller ends (TB design), values up to 0,6 are permissible.

 
imageref_17757187211_All.gif   Continuous axial loading
Point at which a load acts within the co-ordinate system
without simultaneous radial loading
Point at which a load acts within the co-ordinate system
is not permissible.
 
 

Permissible axial load

 

Axial loads are supported by the bearing ribs and the roller end faces ➤ Figure 7. The axial load
Force acting in the direction of the shaft.
carrying capacity of the bearing is therefore essentially dependent on:

 
   
   

Figure 7
Force flow under axial load – semi‑locating bearing SL1850


 

imageref_20910672907_All.gif

 
 

Calculation of permissible axial load – cylindrical rollers
Cylindrical rolling elements sorted to diameter and length, suitable for transmitting normal loads via their cylindrical and end faces (DIN 5402, Part 1)

See Rolling element
with conventional roller ends

Bearings with standard roller ends

 

The permissible axial load Fa per can be calculated from the hydrodynamic 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 contact ➤ Equation 1.

 

Equation 1
Permissible axial load – bearings of standard design
 
imageref_20895919499_All.gif

Legend

 
Fa per
 N
Permissible continuous axial load. In order to prevent unacceptably high temperatures in the bearing, Fa per must not be exceeded
Fa max
 N
Maximum continuous axial load
Force acting in the direction of the shaft.
in relation to rib fracture. In order to prevent unacceptably high pressures at the contact surfaces, Fa max must not be exceeded
kS
Factor as a function of 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
method ➤ Table 1. The factor takes into consideration the lubrication method
Feed of lubricant to the friction points.

See Lubricant
used for the bearing. The better the 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
and, in particular, the heat dissipation, the higher the permissible axial load
kB
Factor as a function of bearing series ➤ Table 2
dM
 mm
Mean bearing diameter dM = (D + d)/2 ➤ dimension table
n
 min–1
Operating speed.
 
   
Table 1
Factor kS
 

Lubrication method
Factor
kS
from
up to
Standard greasing, no heat dissipation by the lubricant
1,5
3
Minimal heat dissipation, drip feed oil
Fluid lubricant with a mineral oil and/or synthetic oil base, usually with active ingredients or additives.
lubrication,
oil mist lubrication, low operating viscosity
The toughness of an oil, dependent on temperature and pressure; the viscosity decreases with increasing temperature and increases with increasing pressure; viscosity is the ability of a fluid to resist reciprocal laminar displacement (deformation) of two adjacent layers (DIN 1342, DIN 51550, ISO 3104)
(ν < 0,5 · ν1)
7,5
10
Poor heat dissipation, oil
Fluid lubricant with a mineral oil and/or synthetic oil base, usually with active ingredients or additives.
sump lubrication,
oil spray lubrication, low oil
Fluid lubricant with a mineral oil and/or synthetic oil base, usually with active ingredients or additives.
flow
10
15
Good heat dissipation, recirculating oil
Fluid lubricant with a mineral oil and/or synthetic oil base, usually with active ingredients or additives.
lubrication
(pressurised oil
Fluid lubricant with a mineral oil and/or synthetic oil base, usually with active ingredients or additives.
lubrication)
12
18
Very good heat dissipation, recirculating oil
Fluid lubricant with a mineral oil and/or synthetic oil base, usually with active ingredients or additives.
lubrication
with oil
Fluid lubricant with a mineral oil and/or synthetic oil base, usually with active ingredients or additives.
cooling, high operating viscosity (ν > 2 · ν1)
16
24

 
imageref_17757187211_All.gif   The precondition for these kS values is an operating viscosity
The toughness of an oil, dependent on temperature and pressure; the viscosity decreases with increasing temperature and increases with increasing pressure; viscosity is the ability of a fluid to resist reciprocal laminar displacement (deformation) of two adjacent layers (DIN 1342, DIN 51550, ISO 3104)
of the lubricant
Gaseous, fluid, consistent, plastic or solid material for reduction of friction and wear between two friction elements.
of at least the reference viscosity ν1 in accordance with DIN ISO 281:2010.
 
imageref_17757201419_All.gif   Doped lubricating oils should be used, such as CLP (DIN 51517) and HLP (DIN 51524) of ISO VG grades 32 to 460, as well as ATF oils (DIN 51502) and transmission oils (DIN 51512) of SAE viscosity grades 75W to 140W.  
 

   
Table 2
Bearing factor kB
 

Series
kB
SL0148
4,5
SL0149
11
SL1850
17
SL0450
17
SL04
10

 
 

Calculation of permissible axial load – cylindrical rollers
Cylindrical rolling elements sorted to diameter and length, suitable for transmitting normal loads via their cylindrical and end faces (DIN 5402, Part 1)

See Rolling element
with toroidal roller ends

 

For bearings with toroidal roller ends, the permissible axial loads are 50% higher ➤ Equation 2.

 

Equation 2
Permissible axial load – bearings of TB design
 
imageref_20897364363_All.gif

 

Calculation of maximum permissible axial load

imageref_17757187211_All.gif   For bearings with rollers
Barrel-shaped, tapered or cylindrical rolling elements
of the standard or TB design, the maximum permissible axial load Fa max ➤ Equation 3 is calculated from the rib strength
See Viscosity
and the security against wear. This must not be exceeded, even if Fa per gives higher values ➤ Equation 4.
 
 


Equation 3
Maximum axial load – bearings of standard and TB design
 
imageref_9007203347529355_All.gif


Equation 4
Permissible axial load
 
imageref_18014402602262667_All.gif

 

Axial 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 cylindrical roller bearings with annular slots (rope sheave bearings)

imageref_18348417035_All.gif   For cylindrical roller bearings with annular slots in the outer ring, the calculations of Fa per and Fa max cannot be used. For the axial load
Force acting in the direction of the shaft.
carrying capacity of these bearings, please consult Schaeffler.
 
 

Compensation of angular misalignments

 
imageref_17757187211_All.gif   The bearings do not permit any misalignments between the inner and outer ring, i.e. the bearing positions must be well aligned.  
 

Lubrication

 

Oil or 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
is possible

 

The cylindrical roller 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. The bearings can be lubricated via the end faces of the outer ring as well as via 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 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
holes in the outer ring.

 
 

Cylindrical roller bearings with annular slots (rope sheave bearings)

The bearings have an initial greasing

 

These bearings are supplied greased and can be relubricated via the outer ring or inner ring. The grease
See
Lubricant
Grease cartridge
Fatty acids
used is a lithium complex soap grease
See
Lubricant
Grease cartridge
Fatty acids
to GA08. Arcanol LOAD150    ➤ link is suitable for relubrication. The 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.
named are highly suitable, due to their good moisture resistance 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, for applications in rope sheaves at low to moderate speeds.

 
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 not sealed, i.e. 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.
 
 

Cylindrical roller bearings with annular slots (rope sheave bearings)

The bearings are sealed on both sides

 

In the case of these bearings, the rolling element
Point or rotationally symmetrical bodies for transmitting loads between raceways.
system is protected against contamination and moisture by polyurethane sealing
See Seals
rings on both sides of the bearing. The 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
have low friction
The resistance to relative movement of two bodies in contact with each other; subdivided into friction terms, friction types and friction conditions
and are particularly resistant to climate and temperature. Where environmental conditions are particularly critical, sealing
See Seals
of the bearings can be improved further by means of additional seals, such as V rings, in the adjacent construction.

 
 

Speeds

 
 

The product tables give two speeds for most bearings:

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

Lower speed capacity than bearings with cage

 

Due to the kinematic conditions, full complement
Design of rolling bearing with the largest possible number of rolling elements (balls or rollers) by the omission of cages or cage elements
cylindrical roller bearings do not achieve the high speeds that are possible when using cylindrical roller bearings with cage.

 
 

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.  
 

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

 
 

The Schaeffler Noise Index (SGI) has been developed as a new feature for comparing the noise level of different bearing types and series. As a result, a noise evaluation of rolling bearings can now be carried out for the first time.

 
 

Schaeffler Noise Index

 

The SGI value is based on the maximum permissible noise level of a bearing in accordance with internal standards, which is calculated on the basis of ISO 15242. In order that different bearing types and series can be compared, the SGI value is plotted against 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 C0.

 
 

This permits direct comparisons between bearings with the same 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. The upper limit value is given in each of the diagrams. This means that the average noise level of the bearings is lower than illustrated in the diagram.

 
imageref_17757187211_All.gif   The Schaeffler Noise Index is an additional performance characteristic in the selection of bearings for noise-sensitive applications. The specific suitability of a bearing for an application in terms of installation space, 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 speed limit for example, must be checked independently of this.
 
 

   

Figure 8
Schaeffler Noise Index for double row full complement
Design of rolling bearing with the largest possible number of rolling elements (balls or rollers) by the omission of cages or cage elements
cylindrical roller bearings

SGI =  Schaeffler Noise Index
C0 =  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

 

imageref_23602477067_All.gif

 
 

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 cylindrical rollers
  • the lubricant
  • the seals.
 
 

 

Possible operating temperatures of double row cylindrical roller bearings ➤ Table 3.

 
   
Table 3
Permissible temperature ranges
 

Operating temperature
Open full complement
Design of rolling bearing with the largest possible number of rolling elements (balls or rollers) by the omission of cages or cage elements
bearings
Rope sheave bearings
imageref_19988082955_All.gif
   
–30 °C to +120 °C
–20 °C to +80 °C,
limited by the lubricant,
cage material 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
–40 °C to +80 °C
with greasing by means of GA22

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

Cages

 
 

Full complement cylindrical roller bearings do not have a cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
for guidance and separation of the rolling elements. The cylindrical rollers
Cylindrical rolling elements sorted to diameter and length, suitable for transmitting normal loads via their cylindrical and end faces (DIN 5402, Part 1)

See Rolling element
are guided by the ribs on the bearing rings.

 
 

Internal clearance

 
 

Radial internal clearance

The standard is CN

 

Double row full complement
Design of rolling bearing with the largest possible number of rolling elements (balls or rollers) by the omission of cages or cage elements
cylindrical roller bearings are manufactured as standard with the radial internal clearance CN (normal) ➤ Table 4. CN is not stated in the designation.

 
imageref_18348417035_All.gif   Certain sizes are also available by agreement with the larger internal clearance C3, C4 and C5 ➤ Table 4.  
imageref_17757201419_All.gif   The values for radial internal clearance correspond to DIN 620-4:2004 (ISO 5753-1:2009) ➤ Table 4. 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).
 
 

   
Table 4
Radial internal clearance of double row full complement
Design of rolling bearing with the largest possible number of rolling elements (balls or rollers) by the omission of cages or cage elements
cylindrical roller bearings
 

Nominal
bore diameter
Radial internal clearance
d
CN
(Group N)
C3
(Group 3)
C4
(Group 4)
C5
(Group 5)
mm
μm
μm
μm
μm
over
incl.
min.
max.
min.
max.
min.
max.
min.
max.
- 24
20
45
35
60
50
75
65
90
24
30
20
45
35
60
50
75
70
95
30
40
25
50
45
70
60
85
80
105
40
50
30
60
50
80
70
100
95
125
50
65
40
70
60
90
80
110
110
140
65
80
40
75
65
100
90
125
130
165
80
100
50
85
75
110
105
140
155
190
100
120
50
90
85
125
125
165
180
220
120
140
60
105
100
145
145
190
200
245
140
160
70
120
115
165
165
215
225
275
160
180
75
125
120
170
170
220
250
300
180
200
90
145
140
195
195
250
275
330
200
225
105
165
160
220
220
280
305
365
225
250
110
175
170
235
235
300
330
395
250
280
125
195
190
260
260
330
370
440
280
315
130
205
200
275
275
350
410
485
315
355
145
225
225
305
305
385
455
535
355
400
190
280
280
370
370
460
510
600

 
 

Radial internal clearance of cylindrical roller bearings with annular slots (rope sheave bearings)

imageref_17757187211_All.gif   The correct radial internal clearance is of decisive importance for the correct function of rope sheaves. The radial internal clearance group is dependent on the material of the rope sheave ➤ Table 5.  
   
Table 5
Radial internal clearance of cylindrical roller bearings with annular slots for the support of rope sheaves as a function of the material of adjacent parts – recommendation
 

Nominal
bore diameter
Material of rope sheave
d
Steel
Plastic
mm
Internal clearance group of bearing
over
incl.
- 85
CN or C3
C5
85
300
C3

 
 

Dimensions, tolerances

 
 

Dimension standards

imageref_17757201419_All.gif   The main dimensions of cylindrical roller bearings correspond to ISO 15:2017 (DIN 616:2000).  
 

Chamfer dimensions

imageref_17757201419_All.gif   The limiting dimensions for chamfer dimensions correspond to DIN 620‑6:2004. Overview and limiting values   ➤ section. Nominal value of chamfer dimension ➤ dimension table.  
 

Tolerances

imageref_17757201419_All.gif   The dimensional and running tolerances
See
Running accuracy
Dimensional accuracy
of the cylindrical roller bearings correspond to the tolerance class Normal in accordance with ISO 492:2014. Tolerance values in accordance with ISO 492 ➤ Table .
 
 

Suffixes

 
 

For a description of the suffixes used in this chapter ➤ Table 6, cylindrical roller bearings with annular slots ➤ Table 7 and medias interchange http://www.schaeffler.de/std/1D52.

 
   
Table 6
Suffixes and corresponding descriptions,
double row full complement
Design of rolling bearing with the largest possible number of rolling elements (balls or rollers) by the omission of cages or cage elements
cylindrical roller bearings
 

Suffix
Description of suffix
BR
Black oxide coated
Available
by agreement
C3
Radial internal clearance C3 (larger than normal)
C4
Radial internal clearance C4 (larger than C3)
C5
Radial internal clearance C5 (larger than C4)
TB
Bearing with increased axial load
Force acting in the direction of the shaft.
carrying capacity
Standard, dependent on bore code and bearing series
XL
X-life bearing

 
   
Table 7
Suffixes and corresponding descriptions,
cylindrical roller bearings with annular slots (rope sheave bearings)
 

Suffix
Description of suffix
C3
Radial internal clearance C3 (larger than normal)
Special design, available
by agreement
C4
Radial internal clearance C4 (larger than C3)
C5
Radial internal clearance C5 (larger than C4)
D
Improved outer ring profile, with an enlarged load-bearing area and optimised edge transitions
Standard
GA22
Bearing greased with lithium soap grease GA22 for expanded temperature range
Special design, available
by agreement
P
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
PP
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
Standard
RR
Corrosion-resistant design, with Corrotect
Thin, galvanic plating containing zinc alloys (binary, ternary) applied to hardened rolling bearing raceways for corrosion protection
coating
Special design, available
by agreement
2NR
Supplied with two loose-packed retaining rings WRE
2WR
Supplied with two loose-packed retaining rings WR
- Without seals

 
 

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 are shown in ➤ Figure 9 and ➤ Figure 10. The composition of designations is subject to DIN 623-1    ➤ Figure.

 
   

Figure 9
Double row full complement
Design of rolling bearing with the largest possible number of rolling elements (balls or rollers) by the omission of cages or cage elements
cylindrical roller bearing
See Rolling bearing
(semi‑locating bearing): 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_20915290635_en.gif

 
   

Figure 10
Double row full complement
Design of rolling bearing with the largest possible number of rolling elements (balls or rollers) by the omission of cages or cage elements
cylindrical roller bearing
See Rolling bearing
(rope sheave bearing): 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_20915292555_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).

 
 

Bearings with non-locating bearing
Non-locating bearings of the longitudinal, transverse or tilting type permit displacement within the bearing requiring almost no force
function and cylindrical roller bearings with annular slots (rope sheave bearings)

P = Fr

 

Non-locating bearings can only support radial loads, rope sheave bearings only have a small axial load
Force acting in the direction of the shaft.
carrying capacity. For these bearings ➤ Equation 5.

 

Equation 5
Equivalent dynamic load
 
imageref_9007199294669579_All.gif

 

Cylindrical roller bearings with semi-locating and locating bearing
Bearing capable of transmitting axial loads from both directions and radial loads
function

P is a substitute force for combined load
Indication of a force acting in a non-perpendicular direction on the bearing.
Load angle b not equal to 0° or 90°.
and various load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
cases

 

If the condition described above is not met, i.e. if, in addition to the radial force Fr, there is also an axial force Fa, a constant radial force must first be determined for 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
calculation that (in relation to the rating life) represents an equivalent load. This force is known as the equivalent dynamic bearing load P.

 

Fa/Fr ≦ e or Fa/Fr > e

 

The calculation of P is dependent on the load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
ratio Fa/Fr and the calculation factors e and Y ➤ Equation 6 and ➤ Equation 7.

 

Equation 6
Equivalent dynamic load
 
imageref_19670284299_All.gif


Equation 7
Equivalent dynamic load
 
imageref_20339725195_All.gif

Legend

 
P
 N
Equivalent dynamic bearing load
Fr
 N
Radial load
Fa
 N
Axial load
e, Y
Factors ➤ Table 8.
 
   
Table 8
Factors e and Y
 

Bearing series
Calculation factors
e
Y
SL1850
0,2
0,6
SL0148, SL0149
0,24
0,5

 
 

Equivalent static bearing load

P0 ≧ F0r

 

For cylindrical roller 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 8.

 

Equation 8
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 9.

 

Equation 9
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 necessary during continuous operation

 

In order that no slippage occurs between the contact partners, the cylindrical roller bearings must be constantly subjected to a sufficiently high radial load. For continuous operation, experience shows that 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 9 to ➤ Table 12.

 
 

Radial location

For secure radial location, tight fits are necessary

 

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 and the mounting and dismounting options 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:

 
   
 

Radial location of cylindrical roller bearings with annular slots (rope sheave bearings)

The outer ring must have an interference fit to achieve rigid seating

 

The axial loads occurring cannot be securely transmitted by the retaining rings. Transmission of the loads is only possible if sufficient joint pressure is present. Due to the operating conditions present in rope sheave bearing arrangements, an interference fit between the outer ring and rope sheave is absolutely critical in order to achieve correct bearing function and load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
transmission. The joint pressure must be between pmin = 2 N/mm2 and pmax = 25 N/mm2. The internal clearance has a considerable influence on bearing function ➤ Table 5.

 
 

Axial location

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, retaining rings, adapter
An accessory mounted on another element, for example a lubrication adapter
and withdrawal sleeves etc., are fundamentally suitable; example ➤ Figure 12.

 
 

Axial location of cylindrical roller bearings with annular slots (rope sheave bearings)

Axial location is carried out by means of retaining rings

 

The annular slots allow axial location of the outer rings using retaining rings ➤ Figure 11. Suitable fasteners are WRE rings or rings in accordance with DIN 471. Locating rings are not included in the scope of delivery. The design 2NR is supplied with two retaining rings WRE packed loose. The split inner ring must be axially secured ➤ Figure 11. The fasteners must not be subjected to axial load.

 
 

Arrangement of several rope sheaves adjacent to each other

imageref_17757187211_All.gif   If housing
See Mounting dimenstions
tolerances
See
Running accuracy
Dimensional accuracy
are present or several rope sheaves are arranged adjacent to each other, axial clearance
The amount by which the bearing rings in a fitted bearing can be moved in an axial direction from one end position to the other without axial loading.
may occur between the inner rings. This must always be prevented by means of design measures. For example, shims are suitable for this purpose.
 
   

Figure 11
Cylindrical roller bearing
See Rolling bearing
with annular slots (rope sheave bearing) – location of outer ring, support of ribs

Symbole/00016410_mei_in_0k_0k.gif  Retaining ring

 

imageref_20916449547_All.gif

 
 

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 cylindrical roller bearings 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 9, tolerances t1 to t3 in accordance with    ➤ Figure. Numerical values for IT grades ➤ Table 10.

 
   
Table 9
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
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
IT4/2
Circumferential load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
IT4/2
IT4
Point load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
IT5/2
Point load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
IT5/2
Housing
IT7 (IT6)
Circumferential load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
IT5/2
Circumferential load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
IT5/2
IT5
Point load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
IT6/2
Point load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
IT6/2

 
   
Table 10
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
18
30
50
80
120
180
250
315
incl.
30
50
80
120
180
250
315
400
Values in μm
IT4

   
6
7
8
10
12
14
16
18
IT5

   
9
11
13
15
18
20
23
25
IT6

   
13
16
19
22
25
29
32
36
IT7

   
21
25
30
35
40
46
52
57

 
 

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 11.

 
 

   
Table 11
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

 
 

Bearing seat design (roughness) for cylindrical roller bearings with annular slots (rope sheave bearings)

 

Recommended roughness
Regular or irregular repeat deviation from an ideal geometric profile.
values for 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 12.

 
   
Table 12
Roughness for 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
on the shaft and in the housing
See Mounting dimenstions
bore for cylindrical roller bearings with annular slots – recommendation
 

Nominal diameter
of bearing seat
d (D)
Roughness
mm
over
incl.
Shaft
Housing bore
20
300
Rz 4
Rz 16

 
 

Mounting dimensions for 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
of bearing rings

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. 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 5418:1993 or an undercut to DIN 509:2006. Proven mounting dimensions
Dimensions such as shaft diameter or hole distances, for example of bearings and guideways, which influence fitting for correct functioning
for the radii and diameters of abutment shoulders are given in the product tables ➤ dimension table. These dimensions are limiting dimensions (maximum or mini­mum dimensions); the actual values should not be higher or lower than specified.

 

Rib support in axially loaded bearings

 

Ribs under axial load
Force acting in the direction of the shaft.
must be supported over their entire height and entire circumference ➤ dimension table and ➤ Figure 12. The size and axial runout 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 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
on the inner ring rib must be observed especially in the case of cylindrical roller bearings subjected to high loads, since these factors also influence the uniformity of the rib load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
and the 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 the shaft. This means that the ribs may be subjected to damaging alternating stresses even in the case of very small misalignments. If the mounting dimensions
Dimensions such as shaft diameter or hole distances, for example of bearings and guideways, which influence fitting for correct functioning
indicated in the product tables are observed, the problems described can be reliably avoided ➤ dimension table.

 

Support in semi-locating bearings

 

In semi-locating bearings, it is sufficient to support the bearing rings on one side, on the rib supporting the axial load ➤ Figure 12.

 
   

Figure 12
Support of inner ring rib supporting axial load

dc =  recommended height of shaft shoulder with axially loaded rib
Arrow =  force flow

 

imageref_20916487819_All.gif

 
 

Support of sealing
See Seals
rings in cylindrical roller bearings with annular slots (rope sheave bearings)

Observe the abutment dimension of the sealing
See Seals
rings

 

The sealing
See Seals
rings must be supported to a sufficient height that they are not pressed out during 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
of the bearings ➤ Figure 13. The dimension d2 in the product tables must be observed ➤ dimension table.

 
   

Figure 13
Rope sheave bearings – support of sealing
See Seals
rings

d2 =  abutment dimension
Symbole/00016410_mei_in_0k_0k.gif  Sealing ring

 

imageref_20916489739_All.gif

 
 

Mounting and dismounting

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

As the bearings are not self-retaining, they are easy to mount

 

The series SL0248 and SL0249 are not self-retaining. As a result, the bearing parts (the inner ring with the rolling element
Point or rotationally symmetrical bodies for transmitting loads between raceways.
set and the outer ring) can be mounted separately from each other ➤ section . This gives simplified mounting of the bearings, especially when the two bearing rings have a tight fit.

 
 

Mounting and dismounting of cylindrical roller bearings with annular slots (rope sheave bearings)

imageref_17757187211_All.gif   During mounting and dismounting of the bearings, the mounting forces must never be directed through the rolling elements, sealing
See Seals
rings or the fasteners on the split bearing ring.
 
 

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:

 
   
   
  
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