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Axial spherical roller bearings
 

Axial spherical roller bearings are suitable where:

 
 
  • bearing arrangements are subjected to high and very high axial loads ➤ section
  • dynamic or static misalignments of the shaft relative to the housing, or deflections of the shaft, must be compensated by the bearing under axial loads ➤ section
  • radial loads occur in addition to axial forces (maximum 55% of Fa➤ section
  • a relatively high speed suitability is required in addition to a 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 ➤ section
  • high shock type loads must be supported
  • bearing parts are to be mounted separately (the bearings are not self‑retaining) ➤ section .
 
   

Figure 1
Axial spherical roller bearing: 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 axial deep groove ball bearing, compensation of misalignments

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

 

imageref_20499187979_All.gif

 
 

Bearing design

 
 

Axial spherical roller bearings are available in the basic design as:

 
 
  • an increased capacity design with sheet steel cage
    The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
    or solid brass cage ➤ Figure 2.
 

X-life bearings

 

The bearings are available in the majority of sizes as X-life bearings ➤ Figure 3.

 
imageref_17757187211_All.gif   The bearing design is dependent on the bearing series and the bearing size. It essentially differs in the configuration and guidance of the cage ➤ section .  
 

Bearings of basic design

The raceway in the housing
See Mounting dimenstions
locating washer has a curved form

 

Axial spherical roller bearings are part of the group of axial roller bearings. These single row, non-self-retaining rolling bearings comprise solid shaft and housing
See Mounting dimenstions
locating washers with raceways for the rolling elements. Cages guide the large number of asymmetrical barrel rollers ➤ section . The cage, roller and cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
assembly, and shaft locating washer form a self-retaining unit. The raceways are arranged oblique to the bearing axis, the raceway in the housing
See Mounting dimenstions
locating washer is of a concave design. This design allows these bearings to combine a range of characteristics, which are essential to many applications, in one bearing, such as angular adjustability for example ➤ section .

 

Roller contact design

 

The stress
Mechanical, mechanical-thermal, mechanical-chemical or tribological influences acting individually or jointly on a component
distribution at the contact points between the rollers
Barrel-shaped, tapered or cylindrical rolling elements
and raceways is determined by the contact surface
The contact surface between two bodies under load, calculated according to Hertz
of the rollers. As a result, the roller geometry is matched to the raceway. This gives a 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 over the entire length of the roller and thus prevents both edge stresses and stress
Mechanical, mechanical-thermal, mechanical-chemical or tribological influences acting individually or jointly on a component
peaks at the ends of the roller.

 
 

Increased capacity design with sheet steel cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
or solid brass cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements

Bearings with sheet steel cage

 

Bearings without a cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
suffix
Addition to the designation, consisting of letters and/or numbers, for example, it may indicate variants of a series
have coated sheet steel cages, which are guided by rollers ➤ Figure 2 and ➤ section . These designs are available as X-life bearings ➤ link .

 

Bearings with solid brass cage

 

Bearings with the cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
suffix MB have solid brass cages that are guided on the shaft locating washer or by the rollers ➤ Figure 2 and ➤ section . The MB design is also available in numerous sizes as X-life bearings ➤ link .

 
 

   

Figure 2
Axial spherical roller bearings of basic design

Fr =  radial load
Fa =  axial load
Symbole/00016410_mei_in_0k_0k.gif  Increased capacity design, with sheet steel cage
Symbole/00016411_mei_in_0k_0k.gif  Increased capacity design, with solid brass cage

 

imageref_20499340171_All.gif

 
 

X-life premium quality

imageref_19964530187_All.gif   X-life bearings exhibit considerably higher performance than conventional axial spherical 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 new cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
design, a higher steel quality, better surface quality
See DIN 55 350 part 11 and ISO 8402 for terminology and definitions.
and optimised roller guidance and lubricant film
Layer separating the sliding or rolling partners
formation.
 
   

Figure 3
Axial spherical roller bearing
See Rolling element
in X-life design

Symbole/00016410_mei_in_0k_0k.gif  Cage
Symbole/00016411_mei_in_0k_0k.gif  Barrel roller
Symbole/00016412_mei_in_0k_0k.gif  Housing locating washer
Symbole/00016413_mei_in_0k_0k.gif  Shaft locating washer

 

imageref_20499362827_All.gif

 
 

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
  • downsizing possible, increased performance density
  • a higher fatigue
    Structural changes, apparent as surface delamination, caused by a large number of overrolling movements under load
    limit load
  • a higher 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
    and smooth 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 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.
 

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

 
 

Areas of application

 

Due to their special technical features, X-life axial spherical roller bearings are highly suitable for bearing arrangements in:

 
 
  • refiners and worm extruders in the pulp and paper industry
  • drilling rigs and roll pressers in the cement industry, mining and raw material processing
  • work rolls and back-up rolls in cold rolling mills
  • extruder gearboxes in chemical plant and refineries
  • air preheaters in thermal power stations
  • POD and azimuth drives in marine propulsion systems.
 
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

 

Designed for very high axial loads and high radial loads

 

Axial spherical roller bearings can support very high axial loads in one direction and – since the raceways are inclined relative to the bearing axis – radial loads acting simultaneously. They are designed for 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, since they have the maximum possible number of large and long barrel rollers, are also suitable for the heaviest loads. As a result of the inclined raceways, the load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
is transmitted from one raceway to the other oblique to the bearing axis ➤ Figure 4. Due to the optimised osculation
Ratio between raceway radius and ball diameter
conditions between the rollers
Barrel-shaped, tapered or cylindrical rolling elements
and raceways, uniform stress
Mechanical, mechanical-thermal, mechanical-chemical or tribological influences acting individually or jointly on a component
distribution is achieved in the bearing.

 
imageref_17757187211_All.gif   The radial load
A force which acts at an angle of b = 0°.
(Fr, F0r) must not exceed 55% of the axial load ➤ Equation 1 and ➤ Equation 2.
 
   

Figure 4
Force flow under axial load

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

See Contact surface
is transmitted from one raceway to the other oblique to the bearing axis.

 

imageref_20499342091_All.gif

 
 

Compensation of angular misalignments

 

Axial spherical roller bearings compensate dynamic and static angular misalignments

 

Due to the concave rolling element
Point or rotationally symmetrical bodies for transmitting loads between raceways.
raceway in the housing
See Mounting dimenstions
locating washer, axial spherical roller bearings are capable of angular adjustment. As a result, they permit skewing between the shaft locating washer and housing
See Mounting dimenstions
locating washer within certain limits, without causing damage
Loss of essential or required characteristics in equipment, machinery or plant or their component parts.
to the bearings or impairing their function. In this way, they can compensate misalignment, shaft deflection
The ability to absorb energy over a certain distance, to store this completely or partially as deformation energy and to release the energy when the load is removed (hysteresis)
and housing
See Mounting dimenstions
deformation ➤ Table 1. The extent to which these table values can be used in practice is, however, essentially dependent on the design of the bearing arrangement, the type of 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
and other factors.

 
 

Permissible adjustment angle

Permissible adjustment angle

 

The adjustment angles given in the table are permissible under the following conditions:

 
 
  • P or P0 ≦ 0,05 · C0a.
  • The angular deviation is constant (static angular misalignment).
  • The rotating component is the shaft locating washer.
 
 

   
Table 1
Permissible skewing under static misalignment
 

Bearing series
Permissible skewing
D < 320 mm
D ≧ 320 mm
292..-E1
1,5°

293..-E1
2,5°
1,5°
294..-E1


 
 
______
D =  bearing outside diameter
 
imageref_18348417035_All.gif   If the rotating component is the housing
See Mounting dimenstions
locating washer or the shaft locating washer undergoes tumbling motion, the angular adjustment facility is smaller. In such cases, please consult Schaeffler.
 
 

Lubrication

 

Oil 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 predominantly used

 

Axial spherical roller bearings are not greased. They are generally lubricated using oil. In some cases, 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
with 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.
containing EP additives is also possible. In this instance, however, it must be ensured that the contact points between the rollers
Barrel-shaped, tapered or cylindrical rolling elements
and the guidance rib are always adequately supplied with grease. This is best achieved if the bearing is completely filled with grease
See
Lubricant
Grease cartridge
Fatty acids
and regularly relubricated.

 

Pay attention to the pumping action in bearings with 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

 

Due to their internal construction, a pumping action occurs in bearings with an asymmetrical cross-section. This pumping action, which is heavily dependent on the circumferential speed, can be used under certain conditions to generate oil
Fluid lubricant with a mineral oil and/or synthetic oil base, usually with active ingredients or additives.
recirculation in the bearing ➤ Figure 5. The pumping action is present in bearing arrangements with a horizontal and vertical shaft and must be taken into account when selecting 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 sealing
See Seals
method.

 
imageref_17757187211_All.gif   The volume flow generated by the bearings can easily reach a throughput of  > 50 l/min. In order to give appropriate possibilities for compensation, ducts for the purposes of oil
Fluid lubricant with a mineral oil and/or synthetic oil base, usually with active ingredients or additives.
return must therefore be included in the housing ➤ Figure 5.
 
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.
 
 

   

Figure 5
Oil recirculation by means of pumping action, ducts for the purposes of oil
Fluid lubricant with a mineral oil and/or synthetic oil base, usually with active ingredients or additives.
return

Symbole/00016410_mei_in_0k_0k.gif  Bearing arrangement with horizontal shaft
Symbole/00016411_mei_in_0k_0k.gif  Bearing arrangement with vertical shaft

 

imageref_20499344011_All.gif

 
 

Sealing

 
 

Axial spherical roller bearings are supplied without seals. In the case of unsealed bearings, sealing
See Seals
of the bearing position must be carried out in the adjacent construction. The sealing
See Seals
system should 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 position.
 
 

Speeds

 
 

The achievable operating speed is dependent on the application, the associated loads and the lubrication. 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.  
 

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.

 
 

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.
 
 

 

Possible operating temperatures of axial spherical roller bearings ➤ Table 2

 
   
Table 2
Permissible temperature ranges
 

Operating temperature
Axial spherical roller bearings
with sheet steel or brass cage
imageref_19988082955_All.gif
   
–30 °C to +200 °C, limited by the lubricant

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

Cages

 

Sheet steel cages or solid brass cages are used as standard

 

Axial spherical roller bearings essentially differ in terms of their cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
design ➤ Figure 2. The design is dependent on the bearing series and the bearing size ➤ Table 3. Sheet steel cages do not have a cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
suffix
Addition to the designation, consisting of letters and/or numbers, for example, it may indicate variants of a series
in the designation ➤ Table 3. The cages have a high strength. They are suitable for high temperatures and all conventional lubricants.

 
imageref_18348417035_All.gif   If there is any uncertainty regarding cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
suitability for a specific application, please consult Schaeffler.
 
 

   
Table 3
Cage, cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
suffix, bore code
 

Bearing series
Sheet steel cage
Solid brass cage
MB
Bore code
292..-E1
- 30 to /1180
293..-E1-XL
17 to 64
68 to /800
293..-E1
- /850 to /1600
294..-E1-XL
12 to 68
72 to /710
294..-E1
- /750 to /1060

 
 

Internal clearance

 

The possible preload
Force due to negative operating clearance or negative bearing clearance in rolling bearings
is determined by the application

 

In the case of axial spherical roller bearings, the axial preload
Force due to negative operating clearance or negative bearing clearance in rolling bearings
is achieved when the bearings are mounted. The requisite preload
Force due to negative operating clearance or negative bearing clearance in rolling bearings
is dependent on the application and must take account of the conditions in 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
while warm from operation and subjected to load. It must always be ensured that no slippage occurs in operation between the rolling elements and raceways. A specific minimum axial load Fa min must be acting on axial spherical roller bearings at all times ➤ section .

 
imageref_18348417035_All.gif   If there is any uncertainty regarding preload, please consult Schaeffler.  
 

Dimensions, tolerances

 
 

Dimension standards

imageref_17757201419_All.gif   The main dimensions of axial spherical roller bearings correspond to ISO 104:2015 and DIN 728:1991.  
 

Chamfer dimensions

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

Tolerances

imageref_17757201419_All.gif   The dimensional and running tolerances
See
Running accuracy
Dimensional accuracy
of shaft and housing
See Mounting dimenstions
locating washers correspond to the tolerance class Normal in accordance with ISO 199:2014 ➤ Table to ➤ Table .
 

Restricted section height tolerance

 

The tolerances
See
Running accuracy
Dimensional accuracy
for section height T are considerably restricted for all axial spherical roller bearings compared to the standard values ➤ Table 4 and ➤ dimension table.

 
   
Table 4
Tolerances for bearing section height
 

Nominal bore diameter
Deviation of bearing section height T
mm
μm
over
incl.
upper
lower
50
80
0
–100
80
120
0
–100
120
180
0
–125
180
250
0
–125
250
315
0
–150
315
400
0
–200
400
500
0
–420
500
630
0
–500
630
800
0
–630
800
1 000
0
–800
1 000
1 250
0
–1 000
1 250
1 600
0
–1 200

 
 

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
E1
Increased capacity design
Standard
MB
Solid brass cage
N1
One retaining slot
in the housing
See Mounting dimenstions
locating washer
N2
Two retaining slots offset by 180°
in the housing
See Mounting dimenstions
locating washer
THI
3 uniformly distributed threaded holes
in one end face of the shaft locating washer
THIE
3 uniformly distributed threaded holes
in one end face of the shaft locating washer,
incl. suitable eye bolts
THO
3 uniformly distributed threaded holes
in one end face of the housing
See Mounting dimenstions
locating washer
THOE
3 uniformly distributed threaded holes
in one end face of the housing
See Mounting dimenstions
locating washer,
incl. suitable eye bolts
XL
X-life bearing

 
 

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 6 and ➤ Figure 7. The composition of desig­nations is subject to DIN 623-1    ➤ Figure.

 
 

   

Figure 6
Axial spherical roller bearing, X-life design: 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_20499345931_en.gif

 
   

Figure 7
Axial spherical roller bearing, X-life design, with retaining slot and threaded holes:
designation structure


 

imageref_20925374731_en.gif

 
 

Dimensioning

 
 

Equivalent dynamic bearing load

P = 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

 

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 = (C/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 axial bearings, this is a purely axial and concentrically acting load. If this condition is not met, an equivalent dynamic bearing load P must 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. In the case of axial bearings, this is a concentrically acting axial load
Force acting in the direction of the shaft.
of constant magnitude and direction, which has the same effect on 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
as the load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
occurring in practice. Calculation ➤ Equation 1.

 

Equation 1
Equivalent dynamic load
 
imageref_14058561035_All.gif

Legend

 
P
 N
Equivalent dynamic bearing load
Fr
 N
Radial load
Fa
 N
Axial load.
 
imageref_17757187211_All.gif   The radial bearing load Fr must not exceed 55% of the axial load Fa: Fr ≦ 0,55 · Fa  
 

Equivalent static bearing load

 

For axial spherical 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 2.

 

Equation 2
Equivalent static load
 
imageref_14058520587_All.gif

Legend

 
P0
 N
Equivalent static bearing load
F0r, F0a
 N
Largest radial or axial load
Force acting in the direction of the shaft.
present (maximum load).
 
imageref_17757187211_All.gif   The radial bearing load F0r must not exceed 55% of the axial load F0a: F0r ≦ 0,55 · F0a  
 

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

imageref_17757210635_All.gif   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. The following values must be observed here ➤ Table 6. Calculation of 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.
 
   
Table 6
Values for 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
 

Static load
safety factor
S0
Conditions
S0 ≧ 8
Axial support by the abutment shoulders in accordance
with the product tables (da and Da) ➤ dimension table
S0 ≧ 6
Full axial support of the housing
See Mounting dimenstions
and shaft locating washers
by the entire mating surface, dimensions D1 and d1 ➤ dimension table
S0 ≧ 4
Full axial support, dimensions D1 and d1 ➤ dimension table together
with good radial support of the housing
See Mounting dimenstions
locating washer
(housing tolerance K7)

 
 

Minimum load

 

Rolling bearings under low loads are particularly prone to slippage

 

If the lubricant film
Layer separating the sliding or rolling partners
is interrupted between the rolling elements and raceways as a result of slippage, the contact partners will come into contact at high relative velocity and the wear
Undesirable change to dimensions and/or surfaces of materials due to frictional forces
in the bearing will increase abruptly. The risk of slippage is particularly high where bearings are subjected to low loads. In order to prevent slippage damage
Loss of essential or required characteristics in equipment, machinery or plant or their component parts.
and guarantee kinematics, a minimum axial load Fa min must therefore be applied to the bearing ➤ Equation 4 and ➤ Table 7.

 

Preload the bearings, if the minimum axial load
Force acting in the direction of the shaft.
is not achieved

 

In vertical bearing arrangements in particular, the requisite minimum axial load Fa min is normally already achieved by the weight of the supported parts and the external forces. If this is not the case, 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
must be preloaded, for example by means of springs or a shaft nut ➤ Figure 8 and ➤ section . The minimum axial load
Force acting in the direction of the shaft.
must be ensured in all operating modes.

 
   

Figure 8
Minimum axial load
Force acting in the direction of the shaft.
applied to an axial spherical roller bearing
See Rolling element
by means of spring preload

Symbole/00016410_mei_in_0k_0k.gif  Pressure springs distributed uniformly around the circumference of the housing
See Mounting dimenstions
locating washer

 

imageref_20545000843_All.gif

 

Equation 4
Minimum axial load
 
imageref_9007199285526667_All.gif

Legend

 
Fa min
 N
Minimum axial load
C0a
 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 ➤ dimension table
ka
Factor for determining the minimum load ➤ Table 7
n
 min–1
Speed.
 
   
Table 7
Factor ka for calculating the minimum axial load
 

Bearing series
Factor
ka
292..-E1
0,6
293..-E1
0,9
294..-E1
0,7

 
 

Design of bearing arrangements

 
 

Design of adjacent parts

Support bearing washers over the circumference and width

 

The adjacent parts to the shaft and housing
See Mounting dimenstions
locating washers must be rigid, flat and perpendicular to the axis of rotation. They must be con­figured such that the bearing washers are supported over the whole circumference and over the whole raceway width; in particular, this must be observed under high loads. The axial runout 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
for axial spherical roller bearings should be designed to IT5 or better ➤ Table 8.

 
imageref_17757187211_All.gif   The housing
See Mounting dimenstions
bore must have a recess with a diameter Db min above the housing
See Mounting dimenstions
locating washer, otherwise the rollers
Barrel-shaped, tapered or cylindrical rolling elements
may graze the housing
See Mounting dimenstions
in the event of shaft misalignments ➤ Figure 9. Dimensions for Db min➤ dimension table.
 

E1 = bearings with new internal construction

 

Due to the new internal construction of the E1 bearings, attention must be paid to the mounting dimensions. This also applies to the configuration of the spacer sleeve on the shaft locating washer (dimensions db, db1) ➤ dimension table.

 
 

   

Figure 9
Release in the housing
See Mounting dimenstions
and maximum height of spacer sleeve

Db min = minimum dimension of recess in the housing
dmax =  maximum height of spacer sleeve
Symbole/00016410_mei_in_0k_0k.gif  Spacer sleeve

 

imageref_20499854859_All.gif

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

IT grade
Nominal dimension in mm
over
50
80
120
180
250
315
incl.
80
120
180
250
315
400
Values in μm
IT5
  13
15
18
20
23
25
continued ▼

 
   
Table 9
Numerical values for ISO
Abbreviation for International Organisation for Standardization.
standard tolerances
See
Running accuracy
Dimensional accuracy
(IT grades) to ISO 286-1:2010
 

IT grade
Nominal dimension in mm
over
400
500
630
800
1000
1250
incl.
500
630
800
1000
1250
1600
Values in μm
IT5
  27
32
36
40
47
55
continued ▲

 
 

Tolerances for shaft and housing
See Mounting dimenstions
bore

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

See Contact surface
of bearing washers

 

Fits for the bearing rings of axial spherical roller bearings, as a function of the condition of rotation ➤ Table 10. The conditions of rotation for shaft and housing
See Mounting dimenstions
locating washers must be taken into consideration when defining the fits (point or circumferential load).

 
 

   
Table 10
Conditions of rotation and fits
 

Adjacent part
Type of load
Operating conditions
Tolerance class1)
Shaft
Combined load
Point load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
for shaft locating washer
j6
Circumferential load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
for shaft locating washer, shaft diameter up to 200 mm
j6 (k6)
Circumferential load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
for shaft locating washer, shaft diameter from 200 mm
k6 (m6)
Housing
Axial load
Normal load
E8
High load
G7
Combined load
Point load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
for housing
See Mounting dimenstions
locating washer
H7
Circumferential load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
for housing
See Mounting dimenstions
locating washer
K7

 
 
______
 1    The envelope requirement Ⓔ applies.
 
imageref_18348417035_All.gif   If there is any uncertainty regarding the design of adjacent parts, please consult Schaeffler.  
 

Mounting and dismounting

 
imageref_17757187211_All.gif   The mounting and dismounting options for the bearings must be taken into consideration in the design of the bearing position.  

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

 

Axial spherical roller bearings are not self-retaining. As a result, the bearing parts can be mounted separately from each other. This gives simplified mounting of the bearings.

 
 

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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