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Axial cylindrical roller bearings
 

Single and double row axial cylindrical roller bearings are particularly suitable where:

 
 
  • high axial and shock loads occur in one direction but no radial loads are present ➤ Figure 1 and ➤ section
  • the load carrying capacity of the corresponding axial deep groove ball bearings is no longer adequate (in this case, bearings of series 811 and 812 are especially suitable) ➤ Figure 1
  • the bearing arrangement
    _dictid_B2640_
    must have very high axial rigidity
  • the axial space available is very small ➤ Figure 1 and ➤ dimension table
  • the bearing arrangement
    _dictid_B2640_
    can be configured, where the axial space is very small, as a direct bearing arrangement ➤ section
  • the bearing parts can or must be mounted separately
  • the bearing arrangement
    _dictid_B2640_
    is not configured in itself but, for cost reasons, ready-to-fit standard bearings are to be used.
 
   

Figure 1
Axial cylindrical roller bearing and axial ball bearing – comparison of load carrying capacity and design envelope

Fa = axial load
Ca =  basic dynamic load rating
Dw =  roller diameter
T =  axial section height of axial deep groove ball bearing

 

imageref_20558574475_All.gif

 
 

Bearing design

 
 

Axial cylindrical roller bearings are available as:

 
 
  • single and double row bearings
  • individual bearing parts for combination, comprising
    • axial cylindrical roller and cage assembly (prefix K)
    • housing locating washer (prefix GS)
    • shaft locating washer (prefix WS)
    • bearing washers (prefix LS, alternatively for shaft and housing locating washer).
 
 

Larger catalogue bearings and other bearing designs ➤ GL 1.

 
 

Axial cylindrical roller bearings

Designed for bearing arrangements with very small axial space

 

Axial cylindrical roller bearings are part of the group of axial roller bearings. In contrast to the ball, the roller has a larger contact area perpendicular to the roller axis. As a result, it can transmit higher forces, has greater rigidity and allows smaller rolling element diameters under the same load. The single and double row bearings comprise flat, ribless washers (housing and shaft locating washers) between which axial cylindrical roller and cage assemblies are arranged ➤ Figure 2 and ➤ Figure 5. Their axial section height T corresponds only to the diam­eter of the rollers plus the thickness of the washers. Due to this design, the bearings are particularly small in axial height ➤ dimension table. The axial cages are made from brass or plastic and are fitted with one or two rows of cylindrical rollers. Since sliding occurs towards the ends of the rollers during rolling of the rolling elements and this increases with the length of the roller, bearings with a wide cross-section have several short rollers arranged adjacent to each other, e.g. double row designs ➤ Figure 2.

 

Rollers with profiled ends increase the operating life of the bearings

 

The cylindrical rollers
_dictid_C4780_
have profiled ends, i.e. they have a slight lateral curvature towards the ends. This modified line contact between the rollers and raceways prevents damaging edge stresses ➤ Figure 3. This in turn has a positive effect on the operating life of the bearings.

 
imageref_17757187211_All.gif   The use of complete axial cylindrical roller bearings (shaft locating washer, axial cylindrical roller and cage assembly and housing locating washer) is then advisable if, for example, high speeds occur and the bearing washers must therefore be centred precisely.  

Roller and cage assembly and bearing washers are also available individually

 

The bearing parts for axial cylindrical roller bearings are also available individually ➤ Figure 4 and ➤ Figure 5. Axial cylindrical roller and cage assemblies (without shaft and housing locating washers) are suitable, for example, for bearing arrangements with very small axial design space.

 
imageref_17757201419_All.gif   Cylindrical roller bearings 811 and 812 are of a single row design and correspond to DIN 722:2005 and ISO 104:2015. The bearings 893 and 894 are of a double row design and are configured in accordance with DIN 616:2000 and ISO 104:2015.  
 

   

Figure 2
Axial cylindrical roller bearings

Fa =  axial load
Symbole/00016410_mei_in_0k_0k.gif  Single row bearing
Symbole/00016411_mei_in_0k_0k.gif  Double row bearing
Symbole/00016412_mei_in_0k_0k.gif  Shaft locating washer
Symbole/00016413_mei_in_0k_0k.gif  Housing locating washer
Symbole/00016414_mei_in_0k_0k.gif  Axial cylindrical roller and cage assembly

 

imageref_20558577419_All.gif

 
   

Figure 3
Roller profile and stress distribution

Symbole/00016410_mei_in_0k_0k.gif  Cylindrical roller profile (high stress peaks)
Symbole/00016411_mei_in_0k_0k.gif  Roller with profiled ends (no stress peak)
Symbole/00016412_mei_in_0k_0k.gif  Cylindrical outside surface region
Symbole/00016413_mei_in_0k_0k.gif  Region of logarithmic tapering
Symbole/00016414_mei_in_0k_0k.gif  Rounding of edge

 

imageref_9007203706154635_All.gif

 
 

Axial cylindrical roller and cage assemblies

Very high axial load carrying capacity with low section height

 

The cage assemblies comprise axial cages and one or two rows of cylindrical rollers ➤ Figure 4. They have a particularly small axial section height and high axial load carrying capacity. The cages are made from polyamide or brass and are guided on the shaft.

 

For direct bearing arrangements, running surfaces must be produced as a rolling bearing raceway

 

Axial cylindrical roller and cage assemblies are generally combined with one housing locating washer and one shaft locating washer. If they are to be used directly – i.e. without axial bearing washers – in the adjacent construction, the raceway for the rollers must be produced as a rolling bearing raceway ➤ section . It is also possible to use two shaft locating washers or two housing locating washers in combination with one axial cylindrical roller and cage assembly.

 
imageref_17757201419_All.gif   The diameter series 1, 2, 3, 4 of the axial cylindrical roller and cage assemblies correspond to DIN 616:2000 and ISO 104:2015.  
 

   

Figure 4
Axial cylindrical roller and cage assemblies

Fa =  axial load
Symbole/00016410_mei_in_0k_0k.gif  Single row
Symbole/00016411_mei_in_0k_0k.gif  Double row

 

imageref_20558579595_All.gif

 
 

Axial bearing washers

Housing and shaft locating washers

 

Housing locating washers are externally centred, shaft locating washers are internally centred ➤ Figure 5 and ➤ section . They must be used if the adjacent construction
_dictid_A480_
cannot be used as a raceway for the rolling elements. The washers are made from through hardening rolling bearing steel. The bore and outside diameter are precision machined, the raceways are ground to high accuracy.

 
imageref_17757201419_All.gif   The diameter series 1, 2, 3, 4 of the axial bearing washers correspond to DIN 616:2000 and ISO 104:2015.  

Bearing washers

 

Bearing washers are suitable for use as a housing or shaft locating washer. They are used in applications that do not require precise centring of the axial bearing washers. The raceway of the bearing washers is hardened and ground. The bearing washers are suitable for axial cylindrical roller and cage assemblies K811 and axial needle roller and cage assemblies AXK.

 
 

   

Figure 5
Axial bearing washers

Symbole/00016410_mei_in_0k_0k.gif  Housing locating washer, externally centred
Symbole/00016411_mei_in_0k_0k.gif  Shaft locating washer, internally centred
Symbole/00016412_mei_in_0k_0k.gif  Bearing washer
Symbole/00016413_mei_in_0k_0k.gif  Raceway

 

imageref_20558581771_All.gif

 
 

Load carrying capacity

 

For very high axial loads acting in one direction

 

Single and double row axial cylindrical roller bearings can support high axial loads as well as axial shock loads in one direction, but must not be subjected to radial load ➤ section . If radial loads do occur, these forces must be supported by an additional bearing (e.g. by a needle roller and cage assembly) ➤ Figure 6.

 
   

Figure 6
Axial and radial loads

Fr =  radial load
Fa =  axial load
Symbole/00016410_mei_in_0k_0k.gif  Needle roller and cage assembly as radial bearing (direct bearing arrangement)
Symbole/00016411_mei_in_0k_0k.gif  Axial cylindrical roller and cage assembly as axial bearing (direct bearing arrangement)

 

imageref_20810566795_All.gif

 
 

Compensation of angular misalignments

 
imageref_17757187211_All.gif   The bearings do not permit any skewing between the shaft and the housing. If angular misalignments occur between the locating surfaces on the shaft and in the housing, this will cause damage to the bearing and considerably reduce its operating life.  
 

Lubrication

 

Oil or grease lubrication is possible

 

Axial cylindrical roller bearings are not greased. The bearings must be lubricated with oil or grease.

 

Compatibility with plastic cages

 

When using bearings with plastic cages, compatibility between the lubricant and the cage material must be ensured if synthetic oils, lubricating greases with a synthetic oil base or lubricants containing a high proportion of EP additives are used.

 
imageref_18348417035_All.gif   If there is any uncertainty regarding the suitability of the selected lubricant for the application, please consult Schaeffler or the lubricant manufacturer.  

Observe oil change intervals

 

Aged oil and additives in the oil can impair the operating life of plastics at high temperatures. As a result, stipulated oil change intervals must be strictly observed.

 
 

Sealing

 
 

The bearings are not sealed; i.e. sealing 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 from the bearing position.
 
 

Speeds

 
 

Two speeds are generally indicated in the product tables ➤ dimension table:

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

Limiting speed

imageref_17757187211_All.gif   The limiting speed nG is the kinematically permissible speed of a bearing. Even under favourable mounting and operating conditions, this value should not be exceeded without prior consultation with Schaeffler    ➤ link. The values in the product tables are valid for oil lubrication.  

Values for grease lubrication

 

For grease lubrication, 25% of the value stated in the product tables is permissible in each case.

 
 

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
_dictid_O940_
of the bearings is limited by:

 
 
  • the dimensional stability of the bearing washers and cylindrical rollers
  • the cage
  • the lubricant.
 
 

Possible operating temperatures of axial cylindrical roller bearings ➤ Table 1.

 
 

   
Table 1
Permissible temperature range
 

Operating temperature
Axial cylindrical roller bearings
with brass or polyamide cage PA66
imageref_19988082955_All.gif
   
–20 °C to +120 °C

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

Cages

 

Solid cages made from brass and polyamide PA66 are used as standard

 

Standard cages ➤ Table 2. The cage design is dependent on the bearing series and the bearing size. Other cage designs are available by agreement. With such cages, however, suitability for high speeds and temperatures as well as the basic load ratings may differ from the values for the bearings with standard cages.

 
imageref_18348417035_All.gif   For high continuous temperatures and applications with difficult operating conditions, bearings with brass cages should be used. If there is any uncertainty regarding cage suitability, please consult Schaeffler.  
 

   
Table 2
Cage, cage suffix, bore code
 

Bearing series
Solid cage
made from polyamide PA66
Solid brass cage
TV
M
standard
standard
Bore code
811, K811
up to 34
from 36
812, K812
06 to 26
from 28
893, K893
06 to 16
17 to 30
894, K894
12 to 14
from 15

 
 

Internal clearance

 

Axial clearance and preload are determined by the application

 

In the case of axial cylindrical roller bearings, the internal clearance (axial clearance) is only achieved when the bearings are mounted. The requisite axial clearance of the bearing arrangement
_dictid_B2640_
is dependent on the application and must take account of the conditions in the bearing arrangement
_dictid_B2640_
while warm from operation and subjected to load. If axial cylindrical roller bearings are subjected to vibrations while under predominantly static load, for example, they must be lightly preloaded. Preload can be applied, for example, using calibrated sheets (shims) ➤ Figure 7. Other suitable means include shaft nuts, disc springs, etc. ➤ section . It must always be ensured that no slippage occurs in operation between the rolling elements and raceways ➤ section . It must also be ensured that the preload does not exceed the optimum value, otherwise there will be an increase in friction and therefore in heat generation in the bearing. These will both have a negative effect on the operating life of the bearings.

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

   

Figure 7
Setting the axial clearance by means of shims

Symbole/00016410_mei_in_0k_0k.gif  Calibrated sheet (shim)

 

imageref_9007205740627211_All.gif

 
 

Dimensions, tolerances

 
 

Dimension standards

imageref_17757201419_All.gif   The main dimensions of axial cylindrical roller bearings correspond to ISO 104:2015.  
 

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 of axial bearing washers GS and WS correspond to the tolerance class Normal in accordance with ISO 199:2014 ➤ Table to ➤ Table .  
  Tolerances of the bore and outside diameter as well as of the width of the bearing parts ➤ Table 3 and ➤ Figure 8.  
   
Table 3
Dimensions and tolerances of bearing parts
 

Bearing component
Dimension
Tolerance
Axial cylindrical roller and
cage assembly K
Dc1
E111)
Dc
a131)
Dw
to DIN 5402-1
Housing locating washer GS
D1
-
D
to ISO 199
B
h11
Shaft locating washer WS
d
to ISO 199
d1
-
B
h11
Bearing washer LS
d
E121)
D
a121)
B
h11

 
 
______
 1    Deviation of the bore diameter Δdmp and deviation of the outside diameter ΔDmp    ➤ link.
 
   

Figure 8
Bearing parts – axial cylindrical roller and cage assemblies and bearing washers


 

imageref_20558583947_All.gif

 
 

Suffixes

 
 

For a description of the suffixes used in this chapter ➤ Table 4 and medias interchange http://www.schaeffler.de/std/1D52.

 
   
Table 4
Suffixes and corresponding descriptions
 

Suffix
Description of suffix
M
Solid brass cage
Standard,
dependent on bore code
TV
Solid cage made from glass fibre reinforced polyamide PA66
P5
High dimensional, geometrical and running accuracy
Special design
for axial bearing washers GS, WS; available by agreement

 
 

Structure of bearing designation

 

Examples of composition of bearing designation

 

The designation of bearings follows a set model. Examples ➤ Figure 9 and ➤ Figure 10. The composition of the designation is subject to DIN 623-1    ➤ Figure.

 
 

   

Figure 9
Single row axial cylindrical roller bearing, comprising axial roller and cage assembly, shaft locating washer and housing locating washer: designation structure


 

imageref_20558932107_en.gif

 
   

Figure 10
Double row axial cylindrical roller bearing, comprising axial roller and cage assembly, shaft locating washer and housing locating washer: designation structure


 

imageref_20558934923_en.gif

 
 

Dimensioning

 
 

Equivalent dynamic bearing load

imageref_17757187211_All.gif   Axial cylindrical roller bearings can only support axial forces ➤ section . In the rating life equation, P is therefore substituted by the value for Fa ➤ Equation 1.  
 


Equation 1
Equivalent dynamic load
 
imageref_1382073739_All.gif

Legend

 
P
 N
Equivalent dynamic bearing load
Fa
 N
Axial load.
 
 

Equivalent static bearing load

Combined loads are not possible

 

In relation to the direction of load, the same conditions apply as for the equivalent dynamic bearing load, i.e. combined loads are not permissible. In the rating life equation, P0 is therefore substituted by the value for F0a ➤ Equation 2.

 
 


Equation 2
Equivalent static load
 
imageref_1382279563_All.gif

Legend

 
P0
 N
Equivalent static bearing load
F0a
 N
Largest axial load present (maximum load).
 
 

Static load safety factor

S0 = C0/P0

 

In addition to the basic rating life L (L10h), it is also always necessary to check the static load safety factor S0 ➤ Equation 3.

 

Equation 3
Static load safety factor
 
imageref_27021597814984331_All.gif

Legend

 
S0
Static load safety factor
C0
 N
Basic static load rating
P0
 N
Equivalent static bearing load.
 
 

Minimum load

 

Rolling bearings under low loads are particularly prone to slippage

 

In order to prevent slippage damage, the bearing must be subjected to a minimum axial load Fa min ➤ Equation 4 and ➤ Table 5. In vertical bearing arrangements in particular, the requisite minimum axial load Fa min is normally achieved, however, simply by the weight of the bearing parts and the external forces. If this is not the case, the bearing arrangement
_dictid_B2640_
must be preloaded, for example by means of springs or a housing nut.

 
 


Equation 4
Minimum axial load
 
imageref_9007199285526667_All.gif

Legend

 
Fa min
 N
Minimum axial load
C0a
 N
Basic static load rating ➤ dimension table
ka
Factor for determining the minimum axial load ➤ Table 5
n
 min–1
Speed.
 
   
Table 5
Factor ka for calculating the minimum axial load
 

Series
Factor
ka
K811
1,4
K812
0,9
K893
0,7
K894
0,5

 
 

Design of bearing arrangements

 
 

Design of adjacent parts

imageref_17757187211_All.gif   Axial cylindrical roller bearings cannot tolerate angular misalignments ➤ section . The locating surfaces for the bearing parts on the shaft and in the housing must therefore be vertical to the shaft axis, while the adjacent parts must be rigid and flat. They must be configured such that the bearing washers are supported as far as possible over the whole circumference and over the whole raceway width; values ➤ dimension table. The radial cage guidance surfaces must be precision machined and wear-resistant (Ramax 0,8 (Rzmax 4)).  
 

For the mounting dimensions, the following values apply ➤ dimension table:

 
 
  • mounting diameter on the shaft ≧ da
  • mounting diameter in the housing ≦ Da.
 
 

Tolerances for shaft and housing bore

 

Proven tolerances are given in ➤ Table 6. If the data are observed, this will give correct radial guidance of the bearing elements.

 
   
Table 6
Tolerances for shafts and housing bores
 

Bearing component
Tolerance class1) for
Shaft
Bore
Axial cylindrical
roller bearings
Shaft guided
h8
-
Housing locating washers
- - H9
Shaft locating washers
- h8
-
Bearing washers
Externally centred as housing locating washer
Shaft released
H9
Internally centred as
shaft locating washer
h8
Bore released

 
 
______
 1    The envelope requirement Ⓔ applies.
 
 

Guidance of bearing parts

Release of shaft and housing locating washers, as a function of centring

 

If the bearing washers are centred on the shaft, they must have radial clearance in the housing bore while, if they are centred in the housing, there must be radial clearance between the washer bore and the shaft ➤ Figure 11.

 
   

Figure 11
Guidance and release of shaft and housing locating washers

Symbole/00016410_mei_in_0k_0k.gif  Housing locating washer (guidance in the housing), radial clearance on the shaft
Symbole/00016411_mei_in_0k_0k.gif  Shaft locating washer (guidance on the shaft), radial clearance in the housing

 

imageref_20558937099_All.gif

 

Guidance of axial roller and cage assemblies

 

In order to achieve the lowest possible sliding speeds on the guidance surfaces, the axial cylindrical roller and cage assemblies are generally guided on the shaft. This is particularly important in the case of high speeds.

 

For a direct bearing arrangement
_dictid_B2640_
of roller and cage assemblies: harden and grind the raceways for the rollers

 

If the axial design space is particularly small, axial cylindrical roller and cage assemblies can also run directly (without axial bearing washers) on the adjacent construction. In this case – and if the load carrying capacity of the axial cylindrical roller and cage assemblies is to be fully utilised – the raceways on the shaft and in the housing must be produced as a rolling bearing raceway or must correspond to the quality and hardness of axial bearing washers. The surface hardness of the raceway must be 670 HV to 840 HV, the hardening depth CHD or SHD must be sufficiently large    ➤ link. The surface roughness Ra must be ≦ 0,2 μm. At a mean roughness value of Ra > 0,2 μm, it is no longer possible to utilise the full load carrying capacity of the bearings. When designing the raceway on the shaft and in the housing, the raceway dimensions Ea and Eb must be observed ➤ dimension table. If the values are observed, this will ensure that the raceways for the cylindrical rollers
_dictid_C4780_
– taking account of any possible axial offset of the roller and cage assembly – are adequately dimensioned.

 
 

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 cylindrical roller bearings are not self-retaining. As a result, the bearing parts (shaft locating washer, housing locating washer and axial cylindrical roller and cage assembly) can be mounted separately from each other. This gives simplified mounting of the bearings.

 
 

Mounting position of the bearing washers

 

The correct mounting position has a considerable influence on the function of the bearing arrangement. Axial bearing washers must always be mounted with the raceway side facing the rolling elements.

 

Shaft locating washers

 

On shaft locating washers, the raceway side is indicated by the smaller chamfer on the bore diameter of the washer.

 

Housing locating washers

 

On housing locating washers, the raceway side is indicated by the smaller chamfer on the outside diameter of the washer.

 
 

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 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 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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