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Drawn cup bearings
 

The bearings:

 
   
   

Figure 1
Comparison of radial design envelope

Symbole/00016410_mei_in_0k_0k.gif  Drawn cup needle roller bearing
See Rolling bearing
with open ends and cage
Symbole/00016411_mei_in_0k_0k.gif  Needle roller bearing
See Rolling bearing
with cage

 

imageref_21970991243_All.gif

 
 

Bearing design

 
 

Drawn cup needle roller
See Rolling element
bearings with open ends are available as:

 
   
 

Drawn cup needle roller
See Rolling element
bearings with closed end are available as:

 
   
 

Drawn cup needle roller
See Rolling element
bearings

The outer cups are thin‑walled and produced by forming methods

 

Drawn cup needle roller
See Rolling element
bearings are part of the group of radial needle roller
See Rolling element
bearings. These ready-to-fit 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
elements are rolling bearings with a very small radial section height. They comprise thin-walled, drawn outer cups and needle roller
See Rolling element
and cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
assemblies which together form a complete unit ➤ Figure 2, ➤ Figure 3, ➤ Figure 5, ➤ Figure 6. The cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
guides the needle rollers
Cylindrical rolling elements with a high length/diameter ratio (DIN 5402 Part 3)
parallel to the axis in pockets.

 

For bearing arrangements with a very small radial design envelope

 

Due to the thin-walled outer cup and the absence of an inner ring, the bearings have a very low cross-sectional height ➤ Figure 1. As a result, they are particularly suitable for applications with a very small radial design envelope. The majority of the bearings are of a single row design and do not have a lubrication
Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.

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

 

Drawn cup needle roller
See Rolling element
bearings can also be combined with inner rings IR or LR

 

Due to the absence of an inner ring, drawn cup needle roller
See Rolling element
bearings require a hardened and ground bearing raceway on the shaft ➤ section . If the shaft cannot be produced as a rolling bearing
Ready-to-fit machine element, often defined in standards, for transmitting movements, loads and tilting moments with a high level of efficiency; rolling bearings consist of rolling elements, cages and raceways on rings, guideways or carriages as well as lubricant and, if necessary, seals and accessories
raceway, the bearings can be combined with inner rings IR or LR ➤ Figure 2. If wider inner rings are used, these can also serve as the running surface for sealing
See Seals
rings G and SD ➤ Figure 2.

 
 

   

Figure 2
Drawn cup needle roller
See Rolling element
bearings with open ends and inner ring

Symbole/00016410_mei_in_0k_0k.gif  Drawn cup needle roller bearing
See Rolling bearing
with open ends
Symbole/00016411_mei_in_0k_0k.gif  Standard inner ring
Symbole/00016412_mei_in_0k_0k.gif  Wider inner ring
Symbole/00016413_mei_in_0k_0k.gif  Sealing ring G

 

imageref_21970995467_All.gif

 
 

Standard drawn cup needle roller
See Rolling element
bearings with open ends and cage

In contrast to drawn cup needle roller
See Rolling element
bearings with closed end, the bearings are open

 

Drawn cup needle roller
See Rolling element
bearings of this design are open at both ends and have the basic designation HK ➤ Figure 3 and ➤ section . They are supplied with needle roller
See Rolling element
and cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
assemblies. Bearings with needle roller
See Rolling element
and cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
assemblies allow higher speeds than the 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
designs. The bearings are available in open and sealed versions ➤ Figure 3 and ➤ section . Double row designs have a lubrication
Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.

See
Lubrication method
Lubrication condition
Recirculating lubrication
Lubrication technology
One-off lubrication
Hydrodynamic lubrication
Lubricant change intervall
Lubricant change
Lubricant
Lubricant paste
Oil
Grease
Lubrication film
Lubrication system
hole in the outer cup and the suffix ZW ➤ Figure 4.

 
   

Figure 3
Single row drawn cup needle roller
See Rolling element
bearings with open ends

Fr = radial load
Symbole/00016410_mei_in_0k_0k.gif  Single row drawn cup needle roller bearing
See Rolling bearing
with open ends, open version
Symbole/00016411_mei_in_0k_0k.gif  Single row drawn cup needle roller bearing
See Rolling bearing
with open ends, sealed on both sides

 

imageref_21973634187_All.gif

 
   

Figure 4
Double row drawn cup needle roller bearing
See Rolling bearing
with open ends

Fr = radial load
Symbole/00016410_mei_in_0k_0k.gif  Lubrication hole

 

imageref_22209044235_All.gif

 
 

Full complement drawn cup needle roller
See Rolling element
bearings with open ends

Particularly 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 within a very small radial design envelope

 

Full complement drawn cup needle roller
See Rolling element
bearings with open ends have the basic designation HN ➤ Figure 5. As these bearings have the maximum number of needle rollers, they offer extremely 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. However, they do not permit the speeds that are possible when drawn cup needle roller
See Rolling element
bearings with open ends are used in conjunction with rolling elements retained by a cage.

 
   

Figure 5
Full complement drawn cup needle roller bearing
See Rolling bearing
with open ends

Fr = radial load

 

imageref_21973636107_All.gif

 
 

Drawn cup needle roller
See Rolling element
bearings with closed end

In contrast to drawn cup needle roller
See Rolling element
bearings with open ends, the bearings are closed at one end

 

Drawn cup needle roller
See Rolling element
bearings of this design are closed at one end ➤ Figure 6. They are thus suitable for closing off the shaft ends of bearing positions. This gives protection
Coatings and layers on metallic materials to prevent damage from corrosion.
against injury by rotating shafts and protects the bearings against contamination and moisture. Depending on the size, the base is either smooth or lock-beaded (stiffened). The profiled base can also support small axial guidance forces. Drawn cup needle roller
See Rolling element
bearings with closed end are available in open and sealed versions ➤ Figure 6 and ➤ section .

 
   

Figure 6
Drawn cup needle roller
See Rolling element
bearings with closed end

Fr = radial load
Symbole/00016410_mei_in_0k_0k.gif  Drawn cup needle roller bearing
See Rolling bearing
with closed end, open version
Symbole/00016411_mei_in_0k_0k.gif  Drawn cup needle roller bearing
See Rolling bearing
with closed end, sealed version

 

imageref_21973641483_All.gif

 
 

Special bearings

 

In addition to the standard catalogue range, special designs are available by agreement:

 
 
  • with enveloping circle Fw from 2 mm to 100 mm
  • for special noise requirements (bearings with special noise testing).
 
 

Universal joint bearings

imageref_18348417035_All.gif   For universal joints, universal joint bearings of series BU and BBU are available by agreement.  
 

Load carrying capacity

 

The bearings are pure radial bearings

 

Drawn cup needle roller
See Rolling element
bearings can support high radial forces, but may only be subjected to radial load. If the bearing position is also required to support axial forces, the bearings can, for example, be combined with axial needle roller
See Rolling element
bearings AXW ➤ Figure 7.

 
   

Figure 7
Drawn cup needle roller bearing
See Rolling bearing
with open ends combined with axial needle roller
See Rolling element
bearing

Fr =  radial load
Fa =  axial load
Symbole/00016410_mei_in_0k_0k.gif  Drawn cup needle roller bearing
See Rolling bearing
with open ends HK (for supporting radial loads)
Symbole/00016411_mei_in_0k_0k.gif  Axial needle roller
See Rolling element
bearing AXW (for supporting axial loads)

 

imageref_21973645707_All.gif

 
 

Compensation of angular misalignments

 

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

 

Drawn cup needle roller
See Rolling element
bearings are not suitable for the compensation of angular misalignments. The extent to which a misalignment
Deviation of an actual line from a theoretical ideal line, for example a bearing axis from the shaft axis; may be due to machining, flexing of shaft or deformation of housing.
of the shaft can be tolerated relative to the housing
See Mounting dimenstions
bore is dependent on factors such as the design of the bearing position, the size of the bearing, the operating clearance
The amount by which the bearing rings in a fitted bearing can be moved in the radial or axial direction from one extreme position to the other.
and the load. For this reason, it is not possible to give a guide value for misalignment.

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

Lubrication

 

Greased bearings

 

Sealed bearings are greased with a lithium complex soap grease
See
Lubricant
Grease cartridge
Fatty acids
to GA08. The grease
See
Lubricant
Grease cartridge
Fatty acids
filling is measured so that it is sufficient for the entire operating life
See Life, rating
of the bearing. As a result, the bearings are maintenance-free.

 
imageref_17757187211_All.gif   Greased bearings should not be washed out or heated to temperatures of > +80 °C prior to mounting.  

Ungreased bearings

 

Ungreased bearings 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 majority of single row bearings do not have a lubrication
Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.

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

 

Compatibility with plastic cages

 

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

 

Observe oil change
See Lubricant change
intervals

 

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

 
 

Lubrication of 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
drawn cup needle roller
See Rolling element
bearings with open ends

The needle rollers
Cylindrical rolling elements with a high length/diameter ratio (DIN 5402 Part 3)
are retained by a special grease

 

Since the needle rollers
Cylindrical rolling elements with a high length/diameter ratio (DIN 5402 Part 3)
in 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 are not retained by mechanical means (no cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
is present), they are retained for transport and fitting by means of a special grease
See
Lubricant
Grease cartridge
Fatty acids
(DIN 51825-K1/2K-30). However, this grease
See
Lubricant
Grease cartridge
Fatty acids
does not have an adequate long term 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
capacity. Relubrication is therefore recommended after fitting.

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

Bearings of special design

 

The following special designs are available by agreement:

 
   
 

Sealing

 

The bearings are open or sealed

 

Drawn cup needle roller
See Rolling element
bearings are available in an open design in accordance with DIN 618:2008 (ISO 3245:2015) and a sealed design in accordance with DIN 618:2008.

 
 

Sealed bearings

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

See
Seal
Operating life
Friction
are particularly space-saving

 

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

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

See
Seal
Operating life
Friction
into the bearing provides a compact, reliable, proven and economical sealing
See Seals
solution.

 
 

Unsealed bearings

 

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

 
 
  • moisture and contaminants from entering the bearing
  • the egress of lubricant
    Gaseous, fluid, consistent, plastic or solid material for reduction of friction and wear between two friction elements.
    from the bearing.
 
 

Sealing of the bearing position with sealing rings G or SD

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

 

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

See
Seal
Operating life
Friction
and are arranged in front of the bearing ➤ Figure 2, ➤ Figure 8. They are suitable for circumferential velocities at the running surface of up to 10 m/s and protect the bearing position reliably against contamination, spray water and excessive loss of lubricant. The sealing
See Seals
rings are matched to the low radial dimensions of drawn cup needle roller
See Rolling element
bearings with open ends. They are very easy to fit, since they are simply pressed into the housing
See Mounting dimenstions
bore.

 
   

Figure 8
Sealing of the bearing position with sealing rings G or SD

Symbole/00016410_mei_in_0k_0k.gif  Drawn cup needle roller bearing
See Rolling bearing
with open ends, open version
Symbole/00016411_mei_in_0k_0k.gif  Sealing ring G
Symbole/00016412_mei_in_0k_0k.gif  Sealing ring SD

 

imageref_21973674379_All.gif

 
 

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
Fluid lubricant with a mineral oil and/or synthetic oil base, usually with active ingredients or additives.
lubrication.
 

Values for grease
See
Lubricant
Grease cartridge
Fatty acids
lubrication

 

For the 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
of open cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
bearings, 60% of the value stated in the product tables is permissible in each case.

 

Speeds for 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

 

Due to the bearing kinematics and higher temperatures within the bearing, the speeds for 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 are lower than for bearings with a cage.

 
 

Reference speeds

nϑr is used to calculate nϑ

 

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

 

Bearings with contact seals

 

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

 
 

Noise

 
 

Schaeffler Noise Index

 

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

 
 

Temperature range

 
 

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

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

 

Possible operating temperatures of drawn cup needle roller
See Rolling element
bearings ➤ Table 1

 
   
Table 1
Permissible temperature ranges
 

Operating temperature
Open drawn cup
needle roller bearings
Sealed drawn cup needle roller
See Rolling element
bearings
with sheet steel cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
or full complement
with polyamide cage PA66
imageref_19988082955_All.gif
   
–30 °C to +140 °C
–20 °C to +120 °C
–20 °C to +100 °C, limited by the lubricant
Gaseous, fluid, consistent, plastic or solid material for reduction of friction and wear between two friction elements.
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

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

Cages

 

Sheet steel cages are used as standard

 

With only a few exceptions, the cages are made from sheet steel. Bearings with a plastic cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
have the suffix TV. Other cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
designs are available by agreement. With such cages, however, suitability for high speeds and temperatures as well as the basic load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
ratings 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 sheet steel cages should be used. If there is any uncertainty regarding cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
suitability, please consult Schaeffler.
 
 

Internal clearance

 

The enveloping circle diameter Fw applies instead of the radial internal clearance

 

In the case of bearings without an inner ring, the dimension for the inner enveloping circle diameter Fw is used instead of the radial internal clearance. The enveloping circle is the inner inscribed circle of the needle rollers
Cylindrical rolling elements with a high length/diameter ratio (DIN 5402 Part 3)
in clearance-free contact with the outer raceway. Once the bearings are mounted, the inner enveloping circle diameter Fw is approximately in tolerance class F8. The precondition for this is that the bore tolerances
See
Running accuracy
Dimensional accuracy
are observed for bearings without an inner ring ➤ section , ➤ Table 6 and ➤ Table 4.

 
 

Checking the enveloping circle diameter Fw

Fw can only be checked in a mounted condition

 

In the case of drawn cup needle roller
See Rolling element
bearings, the inner enveloping circle diameter Fw can only be checked once the bearings are mounted. In order to carry out the check, the bearing is pressed into a steel ring gauge, which has a cylindrical bore with the nominal dimension D and lower deviation of tolerance class N6 (in accordance with ISO 286-2). The ring gauge must have a minimum wall thickness of 20 mm, the minimum width must correspond to the width of the bearing. A plug gauge to ISO 1132-2 is used for checking purposes. The tolerance class of the enveloping circle is within the range of values defined in the table ➤ Table 2.

 
 

Example

Example of checking of Fw

 

For drawn cup needle roller bearing
See Rolling bearing
with open ends HK1010
(Fw = 10 mm), Fw must be between 10,013 mm and 10,031 mm, the ring gauge bore must be 13,980 mm (lower deviation = +13 μm, upper deviation = +31 μm) ➤ Table 2.

 
imageref_17757187211_All.gif   Bearings intended for enveloping circle measurements should not be repeatedly pushed in and out of the gauge. Bearings that have been checked in the ring gauge should not be used again.  
   
Table 2
Ring gauge bore and enveloping circle deviations (to DIN 618:2008)
 

Enveloping circle
Outside diameter
Ring
gauge bore
Enveloping circle deviation
Upper
Lower
Fw
D
mm
mm
mm
μm
μm
2
3
4,6
6,5
4,587
6,484
+24
+24
+6
+6
4
5
6
8
9
10
7,984
8,984
9,984
+28
+28
+28
+10
+10
+10
7
8
9
10
11
12
13
14
10,980
11,980
12,980
13,980
+31
+31
+31
+31
+13
+13
+13
+13
12
12
13
14
15
16
17
18
16
18
19
20
21
22
23
24
15,980
17,980
18,976
19,976
20,976
21,976
22,976
23,976
+34
+34
+34
+34
+34
+34
+34
+34
+16
+16
+16
+16
+16
+16
+16
+16
20
22
25
28
30
26
28
32
35
37
25,976
27,976
31,972
34,972
36,972
+41
+41
+41
+41
+41
+20
+20
+20
+20
+20
32
35
40
45
50
39
42
47
52
58
38,972
41,972
46,972
51,967
57,967
+50
+50
+50
+50
+50
+25
+25
+25
+25
+25
55
60
63
68
62,967
67,967
+60
+60
+30
+30

 
 

Dimensions, tolerances

 
 

Dimension standards

imageref_17757201419_All.gif   The main dimensions of the bearings correspond to DIN 618:2008 and ISO 3245:2015, where standardised. Nominal dimensions of bearings ➤ dimension table.  
 

Tolerances

imageref_17757201419_All.gif   The tolerances
See
Running accuracy
Dimensional accuracy
correspond to DIN 618:2008 (ISO 3245:2015), where standardised. The inner enveloping circle diameter Fw is approximately in tolerance class F8 ➤ section .
 
 

Suffixes

 
 

For a description of the suffixes used in this chapter ➤ Table 3 and medias interchange http://www.schaeffler.de/std/1D52.

 
   
Table 3
Suffixes and corresponding descriptions
 

Suffix
Description of suffix
AS1
With lubrication
Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.

See
Lubrication method
Lubrication condition
Recirculating lubrication
Lubrication technology
One-off lubrication
Hydrodynamic lubrication
Lubricant change intervall
Lubricant change
Lubricant
Lubricant paste
Oil
Grease
Lubrication film
Lubrication system
hole from HK0609
Special design,
available by agreement
GA08
Unsealed, greased bearings for operating temperatures from –20 °C to +140 °C
RS
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
Standard
TV
Cage made from glass fibre reinforced polyamide PA66
ZW
Double row design, with lubrication
Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.

See
Lubrication method
Lubrication condition
Recirculating lubrication
Lubrication technology
One-off lubrication
Hydrodynamic lubrication
Lubricant change intervall
Lubricant change
Lubricant
Lubricant paste
Oil
Grease
Lubrication film
Lubrication system
hole
2RS
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

 
 

Structure 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 9 and ➤ Figure 10. The composition of designations is subject to DIN 623‑1    ➤ Figure.

 
   

Figure 9
Drawn cup needle roller bearing
See Rolling bearing
with closed end, open version: 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_21973677835_en.gif

 
   

Figure 10
Drawn cup needle roller bearing
See Rolling bearing
with open ends, sealed on both sides: designation
Identification of a bearing by letters and numbers, indicating, for example, the series, dimensional series or size code, bore diameter, bearing design and information such as Corrotect plating or length of guideways
structure


 

imageref_21973723787_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 ➤ section . The bearing load Fr is therefore used in the rating life
The basic rating life is the life reached or exceeded by 90% of a sufficiently large group of apparently identical bearings before the first evidence of material fatigue develops
equation for P (P = Fr) ➤ Equation 1.

 

Equation 1
Equivalent dynamic load
 
imageref_9007199294669579_All.gif

Legend

 
P
 N
Equivalent dynamic bearing load
Fr
 N
Radial load.
 
 

Equivalent static bearing load

 

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

See Contact surface
➤ Equation 2.

 

Equation 2
Equivalent static load
 
imageref_9007199294671243_All.gif

Legend

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

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

See Contact surface
safety factor

S0 = C0/P0

 

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

See Contact surface
safety factor S0
 ➤ Equation 3. For drawn cup needle roller
See Rolling element
bearings, S0 ≧ 3 is necessary.

 

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

Legend

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

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

See Contact surface
rating
P0
 N
Equivalent static bearing load.
 
 

Minimum load

 

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

 

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

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

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

Design of bearing arrangements

 
 

Radial location of bearings

Support outer cup/ inner ring over 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, sufficient rigid support must be provided for the thin-walled outer cups in the housing. Due to the thin‑walled outside surface, the bearings only adopt their precise geometry once they have a tight fit. The support for the outer cup in the housing
See Mounting dimenstions
bore can be produced as a cylindrical seating surface. The 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
for the outer cup and the raceway for the rolling elements or inner ring (if the bearing arrangement
Arrangement of bearings, for example locating/locating, semi-locating/semi-locating, non-locating/non-locating, or semi-locating bearings in tandem, O or X arrangement
is not produced as a direct bearing arrangement) 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 the mating parts must meet specific requirements, the bore tolerances
See
Running accuracy
Dimensional accuracy
for the housing
See Mounting dimenstions
bore (recommended tolerance classes) are dependent on the housing
See Mounting dimenstions
material ➤ Table 4. If the housings are not rigid, tests must be carried out to determine which shaft tolerance the desired operating clearance
The amount by which the bearing rings in a fitted bearing can be moved in the radial or axial direction from one extreme position to the other.
will be achieved with. Numerical values for IT grades ➤ Table 5. For the bearings to be mounted without damage, the shaft must have a lead chamfer of 10° to 15°.

 
 

   
Table 4
Tolerance classes and surface design for housings, as a function of the material
 

Housing material
Bore tolerance to ISO 286-2
Roundness tolerance
Parallelism tolerance
Recommended mean roughness
Regular or irregular repeat deviation from an ideal geometric profile.
value
Ramax (Rzmax)
max.
max.
μm
Steel or cast iron
N6
IT5/2
IT5/2
0,8 (4)
Aluminium (Al)
R6
Magnesium (Mg)
S6

 
   
Table 5
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

3
6
10
18
30
50
incl.
3
6
10
18
30
50
80
Values in μm
IT3
  2
2,5
2,5
3
4
4
5
IT4
  3
4
4
5
6
7
8
IT5
  4
5
6
8
9
11
13

 
 

Axial location of bearings

A tight fit is usually sufficient for axial location

 

If axial locating elements such as shoulders and snap rings are not used, the housing
See Mounting dimenstions
bore can be produced easily and particularly economically. This also gives simplified mounting of the bearings.

 
 

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

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

 

Where drawn cup needle roller
See Rolling element
bearings run directly on the shaft (without an inner ring), the raceway for the rolling elements must be produced as a rolling bearing
Ready-to-fit machine element, often defined in standards, for transmitting movements, loads and tilting moments with a high level of efficiency; rolling bearings consist of rolling elements, cages and raceways on rings, guideways or carriages as well as lubricant and, if necessary, seals and accessories
raceway (hardened and ground). Design of raceways ➤ Table 6. The values in the table refer to commonly encountered application examples. If the shaft cannot be produced as a raceway, the bearings can be combined with Schaeffler bearing rings. However, the section height of the bearings will then be increased by the thickness of the rings.

 
   
Table 6
Tolerance class and surface design for the shaft (direct bearing arrangement)
 

Shaft tolerance
to ISO 286-2
Roundness tolerance
Parallelism tolerance
Recommended mean roughness
Regular or irregular repeat deviation from an ideal geometric profile.
value
Ramax (Rzmax)
max.
max.
μm
h6
IT3
IT3
0,2 (1)

 
 

Steels for the raceway (direct bearing arrangement)

 

Through hardening steels

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

Case hardening steels

imageref_17757201419_All.gif   Case hardening steels normally correspond to ISO 683-17 (such as 17MnCr5, 18CrNiMo7-6) or EN 10084 (such as 16MnCr5).  
 

Steels for inductive surface layer hardening

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

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

Nominal surface hardness: ≧ 670 HV

 

The requisite minimum surface hardness
Resistance of a body to indentation by another body; hardness is either intrinsic or is achieved by heat treatment processes (steel) and/or thermochemical diffusion; for rolling bearings, hardness is measured in Rockwell (HRC) or Vickers (HV)
of 670 HV is valid for raceways, axial washers and shaft shoulders. Steels hardened by means of case, flame or induction hardening must have a surface hardness
Resistance of a body to indentation by another body; hardness is either intrinsic or is achieved by heat treatment processes (steel) and/or thermochemical diffusion; for rolling bearings, hardness is measured in Rockwell (HRC) or Vickers (HV)
of 670 HV to 840 HV and an adequate hardening depth CHD or SHD.

 
 

Raceway softer than 670 HV

imageref_17757187211_All.gif   If the raceway fulfils the requirements for rolling bearing
Ready-to-fit machine element, often defined in standards, for transmitting movements, loads and tilting moments with a high level of efficiency; rolling bearings consist of rolling elements, cages and raceways on rings, guideways or carriages as well as lubricant and, if necessary, seals and accessories
materials but is softer than 670 HV, the load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

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

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

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

See Contact surface
rating C0r by the reduction factor fH0 (static hardness
Resistance of a body to indentation by another body; hardness is either intrinsic or is achieved by heat treatment processes (steel) and/or thermochemical diffusion; for rolling bearings, hardness is measured in Rockwell (HRC) or Vickers (HV)
factor) ➤ Figure 11 and ➤ Figure 12.
 
   

Figure 11
Dynamic hardness
Resistance of a body to indentation by another body; hardness is either intrinsic or is achieved by heat treatment processes (steel) and/or thermochemical diffusion; for rolling bearings, hardness is measured in Rockwell (HRC) or Vickers (HV)
factor at reduced hardness
Resistance of a body to indentation by another body; hardness is either intrinsic or is achieved by heat treatment processes (steel) and/or thermochemical diffusion; for rolling bearings, hardness is measured in Rockwell (HRC) or Vickers (HV)
of raceways/rolling elements

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

 

imageref_9007203347547659_All.gif

 
   

Figure 12
Static hardness
Resistance of a body to indentation by another body; hardness is either intrinsic or is achieved by heat treatment processes (steel) and/or thermochemical diffusion; for rolling bearings, hardness is measured in Rockwell (HRC) or Vickers (HV)
factor at reduced hardness
Resistance of a body to indentation by another body; hardness is either intrinsic or is achieved by heat treatment processes (steel) and/or thermochemical diffusion; for rolling bearings, hardness is measured in Rockwell (HRC) or Vickers (HV)
of raceways/rolling elements

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

 

imageref_22094324363_All.gif

 
 

Determining the case hardening depth

Approximation value for case hardening depth

 

In order to obtain an approximation value for defining the minimum hardening depth, the relationship in accordance with ➤ Equation 4 can be used as a basis. The reference value for the load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

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

 

Equation 4
Case hardening depth
 
imageref_19497382667_All.gif

Legend

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

Determining the surface hardening depth

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

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

Determining the surface hardening depth

 

The rule of thumb for calculating the surface hardening depth SHD is the relationship in accordance with ➤ Equation 5

 

Equation 5
Surface hardening depth
 
imageref_10856257163_All.gif

Legend

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

Mounting and dismounting

 

Ensure that the bearings are not damaged during mounting

 

The bearings are self-retaining (not separable). They are mounted using a special fitting mandrel ➤ Figure 13. The shoulder of the fitting mandrel must rest against the marked end face (designation) of the bearing. A toroidal ring should be used to retain the bearing. The length and oversize of the ring must be matched by the customer to the dimensions and mass of the bearing. The press-in forces occurring during mounting are dependent on several factors. Mounting must be carried out so that the bearing rib on the end face is not deformed. If the application requires a mounting procedure different from the one described, mounting trials must be carried out in order to ensure that the bearings can be mounted correctly and without causing damage.

 
imageref_17757187211_All.gif   Drawn cup needle roller
See Rolling element
bearings must not be tilted during pressing-in, as this may damage
Loss of essential or required characteristics in equipment, machinery or plant or their component parts.
the bearing. If 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 to be used, the bearings should be lubricated with grease
See
Lubricant
Grease cartridge
Fatty acids
before mounting.
 
 

   

Figure 13
Mounting of a drawn cup needle roller bearing
See Rolling bearing
with open ends using a fitting mandrel: design of the fitting mandrel

General tolerances
See
Running accuracy
Dimensional accuracy
to ISO 2768-1
Fw =  inner enveloping circle diameter
D =  bearing outside diameter
R =  radii of fitting mandrel
Symbole/00016410_mei_in_0k_0k.gif  Toroidal ring

 

imageref_18014404995331723_All.gif

 
 

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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