Schaeffler Product catalogue - medias
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Yoke type ball bearing track rollers, stud type ball bearing track rollers
 

Ball bearing track rollers:

 
 
  • are ready-to-fit, single or double row rolling bearings based on deep groove or angular contact ball bearings ➤ Figure 2 to ➤ Figure 6
  • are supplied with or without a stud (designs without a stud are mounted on shafts or studs)
  • have particularly thick-walled outer rings with a crowned or cylindrical outside surface ➤ section
  • can support high radial loads ➤ section
  • tolerate axial loads which are due to small 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.
    defects, skewed running or temporary contact running impacts
  • are sealed on both sides ➤ section
  • are also available with a plastic tyre on the outer ring for low-noise running ➤ section , ➤ Figure 6
  • are not mounted in a housing
    See Mounting dimenstions
    bore, but are supported on a flat mating track ➤ Figure 1 and ➤ Figure 5
  • can be adjusted to the mating track in the design with the eccentric collar, thus permitting, for example, larger manufacturing tolerances
    See
    Running accuracy
    Dimensional accuracy
    in the adjacent construction.
 
   

Figure 1
Double row stud type track roller supported on a flat mating track

Symbole/00016410_mei_in_0k_0k.gif  Mating track

 

imageref_23097310859_All.gif

 
 

Bearing design

 
 

The bearings are available as:

 
 
  • yoke type track rollers
    Barrel-shaped, tapered or cylindrical rolling elements
    (single or double row) ➤ Figure 2
  • stud type track rollers
    Barrel-shaped, tapered or cylindrical rolling elements
    (single or double row) ➤ Figure 3 to ➤ Figure 5
  • track rollers
    Barrel-shaped, tapered or cylindrical rolling elements
    with plastic outer tyre ➤ Figure 6.
 
 

Ball bearing track rollers
Barrel-shaped, tapered or cylindrical rolling elements
(general)

Characterised by a thick-walled outer ring

 

Ball bearing track rollers
Barrel-shaped, tapered or cylindrical rolling elements
are self-retaining, single or double row ball bearings with particularly thick-walled outer rings. In addition to high radial forces, these bearings can also support axial forces in both directions. Ball bearing track rollers
Barrel-shaped, tapered or cylindrical rolling elements
are available for various applications with an inner ring, with a stud and with a plastic tyre on the outer ring ➤ Figure 2 to ➤ Figure 6.

 

Applications

 

Typical areas of application of these products include cam gears, bed ways, conveying equipment and linear guidance systems.

 
 

Outside surface profile of the outer ring

Spherical or cylindrical outside surface

 

Yoke type track rollers
Barrel-shaped, tapered or cylindrical rolling elements
and stud type track rollers
Barrel-shaped, tapered or cylindrical rolling elements
with a crowned outside surface have a radius of curvature of R = 500 mm. Yoke type track rollers
Barrel-shaped, tapered or cylindrical rolling elements
with a cylindrical outside surface have the suffix X ➤ Table 3.

 

The crowned outside surface prevents edge stresses under skewing

 

Yoke type track rollers
Barrel-shaped, tapered or cylindrical rolling elements
with a crowned outside surface are used where skewing can occur relative to the mating track. The crowned design reduces the risk of edge stresses ➤ link .

 
 

Corrosion protection
Coatings and layers on metallic materials to prevent damage from corrosion.
by Corrotect

Special coating
Surface technology to improve tribological behaviour, corrosion resistance, e.g. by INA Corrotect and for electrical insulation.
Corrotect

 

For applications requiring increased protection
Coatings and layers on metallic materials to prevent damage from corrosion.
against corrosion, yoke type track rollers
Barrel-shaped, tapered or cylindrical rolling elements
with the special Cr(VI)-free coating
Surface technology to improve tribological behaviour, corrosion resistance, e.g. by INA Corrotect and for electrical insulation.
Corrotect
Thin, galvanic plating containing zinc alloys (binary, ternary) applied to hardened rolling bearing raceways for corrosion protection
are available by agreement as a special design; description of Corrotect
Thin, galvanic plating containing zinc alloys (binary, ternary) applied to hardened rolling bearing raceways for corrosion protection
➤ link .

 
 

Yoke type track rollers

Comparable in design to deep groove or angular contact ball bearings

 

Yoke type track rollers
Barrel-shaped, tapered or cylindrical rolling elements
are similar in construction to deep groove or angular contact ball bearings and are mounted on shafts or studs ➤ Figure 2. They have outer rings with a crowned or cylindrical outside surface, inner rings and ball and cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
assemblies with plastic cages. Yoke type track rollers LR6, LR60 and LR2 are single row, LR50, LR52 and LR53 are double row.

 
 

Double row design

LR52, LR53

 

While the outer dimensions remain unchanged, the internal construction of yoke type track rollers LR52 and LR53 has been optimised. This has brought about an increase in 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 speed in continuous operation, and in grease
See
Lubricant
Grease cartridge
Fatty acids
lubrication nD G. These yoke type track rollers
Barrel-shaped, tapered or cylindrical rolling elements
are X-life bearings ➤ link .

 
   

Figure 2
Yoke type track rollers, sealed on both sides

Fr =  radial load
Fa =  axial load
Symbole/00016410_mei_in_0k_0k.gif  Single row, lip seals, with radial sealing
See Seals
action (LR6..‑2RSR)
Symbole/00016411_mei_in_0k_0k.gif  Double row, sealing
See Seals
shields (LR52..-2Z)

 

imageref_23097316235_All.gif

 
 

Stud type track rollers

Heavy-section roller stud, with or without eccentric collar

 

Stud type track rollers
Barrel-shaped, tapered or cylindrical rolling elements
have outer rings with a crowned outside surface, heavy-section roller studs and ball and cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
assemblies with plastic cages ➤ Figure 3 and ➤ Figure 4. The yoke type track rollers
Barrel-shaped, tapered or cylindrical rolling elements
are available with and without an eccentric collar.

 
 

For ease of mounting, the roller stud is produced in one of the following designs:

 
   
 

Track rollers ZL2 are single row, ZL52, ZLE52 and KR52 are double row.

 

Design without eccentric collar

 

Stud type track rollers
Barrel-shaped, tapered or cylindrical rolling elements
without an eccentric collar are suitable for appli­cations where a defined requirement for adjustment of the outer ring outside surface in relation to the mating track on the adjacent construction
The immediate environment of the bearing; the bearing and adjacent construction have a reciprocal influence on each other
is not present ➤ Figure 3 and ➤ Figure 4.

 
   

Figure 3
Stud type track rollers, without eccentric collar, short roller stud with threaded hole, sealed on both sides

Fr =  radial load
Fa =  axial load
Symbole/00016410_mei_in_0k_0k.gif  Single row, lip 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 stud side plus sealing
See Seals
shield and cover
Device for protecting guidance elements against contaminants, swarf, coolant lubricants and mechanical damage.
(ZL..-DRS)
Symbole/00016411_mei_in_0k_0k.gif  Double row, lip 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 stud side plus sealing
See Seals
shield and cover
Device for protecting guidance elements against contaminants, swarf, coolant lubricants and mechanical damage.
(ZL52..-DRS)

 

imageref_23097318411_All.gif

 
   

Figure 4
Stud type track roller, without eccentric collar, long roller stud with external thread, sealed on both sides

Fr =  radial load
Fa =  axial load
Symbole/00016410_mei_in_0k_0k.gif  Double row, lip seals, with axial sealing
See Seals
action (KR52..-2RS)

 

imageref_23097345931_All.gif

 

Design with eccentric collar

 

Stud type track rollers ZLE52 have an eccentric collar ➤ Figure 5. The eccentric collar can be used to adjust the outside surface of the outer ring clearance-free against the mating track. This gives optimum geometrical locking between the track roller and mating track. Furthermore, larger manu­facturing tolerances
See
Running accuracy
Dimensional accuracy
can be tolerated in the adjacent construction. The load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
distribution when several stud type track rollers
Barrel-shaped, tapered or cylindrical rolling elements
are used is also more uniform. For countertensioning during fitting, this series has flat areas on both sides of the roller stud. Threaded connections must be provided on the two end faces for relubrication, dimensions ➤ dimension table.

 
   

Figure 5
Stud type track roller, with eccentric collar, long roller stud with external thread, sealed on both sides

Fr =  radial load
Fa =  axial load
Symbole/00016410_mei_in_0k_0k.gif  Double row, sealing
See Seals
shields (ZLE52..-2Z)

 

imageref_23097347851_All.gif

 
 

Track rollers
Barrel-shaped, tapered or cylindrical rolling elements
with plastic outer tyre

Suitable for low loads and high demands on low-noise running

 

Track rollers KLRU and KLRZ comprise single row deep groove ball bearings with a shrink-fitted polyamide outer ring (PA) ➤ Figure 6. Polyamide can tolerate higher specific contact pressures than elastomer and is relatively resistant to abrasion. These track rollers
Barrel-shaped, tapered or cylindrical rolling elements
are mounted on shafts or studs and are used where low loads are present and the bearings are required to run particularly quietly.

 
 

Outside surface profile of the outer ring

Spherical or cylindrical outside surface

 

Track rollers KLRU have an outer ring with a crowned outside surface. The radius of curvature is indicated in the product table. Series KLRZ has a cylindrical outside surface.

 
 

Maximum radial load

imageref_17757187211_All.gif   The maximum radial load
A force which acts at an angle of b = 0°.
is determined by the permissible contact pressure; the values Fr per in the product tables must not be exceeded.
 
   

Figure 6
Track rollers
Barrel-shaped, tapered or cylindrical rolling elements
with plastic outer tyre, sealed on both sides

Fr =  radial load
Fa =  axial load
Symbole/00016410_mei_in_0k_0k.gif  Crowned outside surface, sealing
See Seals
shields (KLRU..-2Z)
Symbole/00016411_mei_in_0k_0k.gif  Cylindrical outside surface, sealing
See Seals
shields (KLRZ..-2Z)

 

imageref_23097349771_All.gif

 
 

X-life premium quality

imageref_19964530187_All.gif   Track rollers LR52 and LR53, which have undergone comprehensive further development, are supplied in the X-life design. These track rollers
Barrel-shaped, tapered or cylindrical rolling elements
are characterised by a longer rating life
The basic rating life is the life reached or exceeded by 90% of a sufficiently large group of apparently identical bearings before the first evidence of material fatigue develops
and operating life, due to higher basic dynamic load
The term dynamic indicates that the operating condition is with the bearing rotating. This is not a variable load.
ratings compared with standard track rollers.
 
  This higher performance results from the use of state of the art manufacturing techniques and improved internal constructions. They lead to better and more uniform 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
and contact areas and thus optimised 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.
 
 

This opens up expanded design possibilities:

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

    See Contact surface
    and with an unchanged design envelope, X-life bearings have a longer rating life. Maintenance
    Inspection, maintenance and repair of equipment and machines.
    intervals can be extended
  • Conversely, an X-life bearing in the same design envelope and with the same 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
    can support higher loads
  • Where 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
    and load
    Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

    See Contact surface
    remain unchanged, X-life bearings allow higher performance density, facilitating optimisation of the design envelope and reductions in mass.
 

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 track rollers
Barrel-shaped, tapered or cylindrical rolling elements
include the suffix XL in the designation.

 
 

Load carrying capacity

 

Suitable for high radial loads

 

The track rollers
Barrel-shaped, tapered or cylindrical rolling elements
can support high radial loads as well as axial loads arising from slight 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.
and skewed running.

 
 

Installation as track roller

 

In the case of track rollers, the outer ring is supported on the mating track at certain points and undergoes elastic deformation (oval deformation) ➤ Figure 7. Compared to rolling bearings supported in a housing
See Mounting dimenstions
bore, track rollers
Barrel-shaped, tapered or cylindrical rolling elements
therefore have:

 
 
  • a modified 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 (load is supported by fewer rolling elements in the loaded zone). This is taken into consideration by the reduced effective basic load
    Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

    See Contact surface
    ratings Cr w and C0r w used in the calculation of the rating life.
  • bending stresses and reverse bending strengths in the outer ring. These are taken into consideration by the permissible effective radial loads Fr per and F0r per. The bending stresses and reverse bending strengths must not exceed the permissible strength
    See Viscosity
    values of the material.
 
   

Figure 7
Installation as track roller: deformation
Undesired modification of the form of a solid body due to force.
of the outer ring when used against a flat mating track


 

imageref_23159008395_All.gif

 
 

Compensation of angular misalignments

 

Not suitable for the compensation of angular misalignments

 

Track rollers
Barrel-shaped, tapered or cylindrical rolling elements
are not suitable for the compensation of angular misalignments, but can tolerate small misalignments and slight skewed running; for limits see chapter Yoke type roller bearing
See Rolling bearing
track rollers, stud type roller bearing
See Rolling bearing
track rollers ➤ link

 

Skewed running

 

Skewed running leads to additional axial loading
Point at which a load acts within the co-ordinate system
of the bearing and to elastic axial slippage in rolling contact between the outer ring and the mating track.

 

Tilted running

 

If tilting
Deviation from the normal position due to load or geometrical influence

See Misalignment error
occurs during running, increased edge stresses occur, especially in track rollers
Barrel-shaped, tapered or cylindrical rolling elements
with a cylindrical outside surface of the outer ring. Track rollers
Barrel-shaped, tapered or cylindrical rolling elements
with a crowned outer ring are less sensitive to tilting
Deviation from the normal position due to load or geometrical influence

See Misalignment error
and should therefore be used in preference if tilting
Deviation from the normal position due to load or geometrical influence

See Misalignment error
is expected.

 
 

Lubrication

 

Greased using a grease
See
Lubricant
Grease cartridge
Fatty acids
to GA13

 

The track rollers
Barrel-shaped, tapered or cylindrical rolling elements
are greased using a lithium soap grease
Lubricating grease based on lithium soap, mineral oil and/or synthetic oil
to GA13. In the case of stud type track rollers, series ZLE52 can be lubricated via the roller stud. Track rollers
Barrel-shaped, tapered or cylindrical rolling elements
with a plastic outer tyre cannot be relubricated. Suitable 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.
for relubrication ➤ Table .

 

LR52, LR53

 

Double row track rollers
Barrel-shaped, tapered or cylindrical rolling elements
are also greased using a lithium soap grease
Lubricating grease based on lithium soap, mineral oil and/or synthetic oil
to GA13. Due to the improved internal construction, less friction
The resistance to relative movement of two bodies in contact with each other; subdivided into friction terms, friction types and friction conditions
occurs and less strain is placed on the lubricant. This leads to lower bearing temperatures.

 
 

Two contact zones

 

Two contact zones must be lubricated and considered separately:

 
 
  • the rolling elements and rolling element
    Point or rotationally symmetrical bodies for transmitting loads between raceways.
    raceway
  • the outside surface of the track roller and the mating track.
 
imageref_18348417035_All.gif   Track rollers
Barrel-shaped, tapered or cylindrical rolling elements
are also available as a special design with a lubrication
Feed of fresh lubricant to friction points. Fresh lubricant mixes with used lubricant at the friction point. Lubricant feed is by means of lubrication equipment. The time period for relubrication is shorter than that for the lubricant change interval.

See
Lubrication method
Lubrication condition
Recirculating lubrication
Lubrication technology
One-off lubrication
Hydrodynamic lubrication
Lubricant change intervall
Lubricant change
Lubricant
Lubricant paste
Oil
Grease
Lubrication film
Lubrication system
hole in the inner ring. These bearings have the suffix IS1 ➤ Table 3.
 
 

Sealing

 
 

Yoke type track rollers

Bearings with the suffix 2RSR

 

Yoke type track rollers
Barrel-shaped, tapered or cylindrical rolling elements
with the suffix 2RSR have lip 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
with radial sealing
See Seals
action on both sides. In some sizes, RS seals  with axial sealing
See Seals
action are fitted for reasons of space.

 

2HRS or 2Z seal

 

Double row yoke type track rollers
Barrel-shaped, tapered or cylindrical rolling elements
in X-life quality
See DIN 55 350 part 11 and ISO 8402 for terminology and definitions.
have a revised sealing
See Seals
concept with a significantly improved sealing
See Seals
action compared to the previous design ➤ Figure 8. Further information on HRS seals  ➤ Table . As standard, the bearings (suffix 2HRS) have DEHP-free lip 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
on both sides.

 
   

Figure 8
Lip seal 2HRS or sealing shield 2Z

Symbole/00016410_mei_in_0k_0k.gif  Innovative geometry of lip seal 2HRS with axial contact between sealing
See Seals
ring and inner ring
Symbole/00016411_mei_in_0k_0k.gif  Sealing shield 2Z with labyrinth seal

 

imageref_23137163787_All.gif

 
 

Stud type track rollers

Series ZL2 and ZL52

 

Stud type track rollers ZL2 and ZL52 have lip 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
on the stud side and the suffix DRS. The opposite side can be sealed using the plastic cover
Device for protecting guidance elements against contaminants, swarf, coolant lubricants and mechanical damage.
supplied.

 

Series ZLE52

 

Stud type track rollers ZLE52 have sealing
See Seals
shields on both sides and the suffix 2Z.

 
 

Track rollers
Barrel-shaped, tapered or cylindrical rolling elements
with plastic outer tyre

Sealing shields or lip seals

 

These track rollers
Barrel-shaped, tapered or cylindrical rolling elements
have sealing
See Seals
shields on both sides (suffix 2Z) or lip 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
with radial sealing
See Seals
action (suffix 2RSR).

 
 

Speeds

 

Speeds nD G

 

The maximum permissible speed for track rollers
Barrel-shaped, tapered or cylindrical rolling elements
is essentially determined by the permissible 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 track rollers. The speed thus depends on the type of bearing, the load, 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
conditions and the cooling conditions.

 

Speeds with lip seals

 

The speed of track rollers
Barrel-shaped, tapered or cylindrical rolling elements
with lip 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
is additionally restricted by the permissible sliding speed at the seal
Elements such as axial face seal, labyrinth seal, rotary shaft seal or gap seal which prevent the ingress of gaseous, liquid and solid materials through the gaps between combined components during movement or whilst stationary
lip.

 

Speeds during continuous operation

 

The speeds nD G in the product tables are guide values and are valid for grease
See
Lubricant
Grease cartridge
Fatty acids
lubrication.

 
imageref_17757187211_All.gif   Additional information on the subject of speeds in the chapter Yoke type roller bearing
See Rolling bearing
track rollers, stud type roller bearing
See Rolling bearing
track rollers
Barrel-shaped, tapered or cylindrical rolling elements
must be observed ➤ section .
 
 

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 track rollers
Barrel-shaped, tapered or cylindrical rolling elements
is limited by:

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

 

Possible operating temperatures of the track rollers
Barrel-shaped, tapered or cylindrical rolling elements
➤ Table 1.

 
   
Table 1
Permissible temperature ranges
 

Operating temperature
Yoke type track rollers
with plastic outer tyre KLRU and KLRZ
without plastic outer tyre
imageref_19988082955_All.gif
   
–20 °C to +80 °C
–20 °C to +120 °C

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

Cages

 

Solid cages made from polyamide PA66 are used as standard

 

The cages used in the track rollers
Barrel-shaped, tapered or cylindrical rolling elements
are plastic cages made from glass fibre reinforced polyamide PA66. These cages have a low mass as well as good sliding and emergency running characteristics. Track rollers
Barrel-shaped, tapered or cylindrical rolling elements
in the X-life design have an optimised polyamide cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
as standard.

 
 

Internal clearance

 
 

Radial internal clearance

The standard is CN

 

Track rollers
Barrel-shaped, tapered or cylindrical rolling elements
are manufactured as standard with radial internal clearance CN (normal) ➤ Table 2. CN is not stated in the designation.

 
imageref_17757201419_All.gif   The values for radial internal clearance correspond to DIN 620-4:2004 (ISO 5753-1:2009). These are valid for bearings which are free from load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
and measurement forces (without elastic deformation).
 
   
Table 2
Radial internal clearance for yoke and stud type track rollers
 

Nominal
bore diameter
Radial internal clearance
d
C2
(Group 2)
CN
(Group N)
C3
(Group 3)
C4
(Group 4)
C5
(Group 5)
mm
μm
μm
μm
μm
μm
over
incl.
min.
max.
min.
max.
min.
max.
min.
max.
min.
max.
2,5
10
0
7
2
13
8
23
14
29
20
37
10
18
0
9
3
18
11
25
18
33
25
45
18
24
0
10
5
20
13
28
20
36
28
48
24
30
1
11
5
20
13
28
23
41
30
53
30
40
1
11
6
20
15
33
28
46
40
64
40
50
1
11
6
23
18
36
30
51
45
73
50
65
1
15
8
28
23
43
38
61
55
90

 
 

Dimensions, tolerances

 
 

Tolerances

imageref_17757201419_All.gif   The tolerances
See
Running accuracy
Dimensional accuracy
for the dimensional and running accuracy
Measured in terms of radial runout and axial runout, due to the dimensional and geometrical tolerances of the bearing in motion, defined according to DIN
of track rollers
Barrel-shaped, tapered or cylindrical rolling elements
correspond to tolerance class Normal in accordance with ISO 492:2014. In a deviation from ISO 492, the diameter tolerance of the profiled outside surface is 0/–0,05 mm.
 
 

The stud diameter tolerances
See
Running accuracy
Dimensional accuracy
for stud type track rollers
Barrel-shaped, tapered or cylindrical rolling elements
are:

 
 
  • in tolerance class r6 for ZL2 and ZL52
  • in tolerance class h7 for KR52
  • in tolerance class h9 for ZLE52.
 
 

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
DRS
Lip 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 stud side, axial sealing
See Seals
action
Sealing shield with cover
Device for protecting guidance elements against contaminants, swarf, coolant lubricants and mechanical damage.
on the end face
Standard
IS1
Lubrication hole in inner ring
Special design, available
by agreement
RR
Protected against corrosion
Reaction of a metallic material with its environment.
by Corrotect
Thin, galvanic plating containing zinc alloys (binary, ternary) applied to hardened rolling bearing raceways for corrosion protection
special coating
TVH
Cage made from glass fibre reinforced polyamide
Standard
X
Cylindrical outside surface
XL
X-life design
2HRS
Lip 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 with optimised geometry,
low friction
2RS
Lip 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, with axial sealing
See Seals
action
2RSR
Lip 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, with radial sealing
See Seals
action
2Z
Sealing shield on both sides

 
 

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 9 to ➤ Figure 11.

 
   

Figure 9
Single row yoke type track roller, lip 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: 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_23097376139_en.gif

 
   

Figure 10
Double row yoke type track roller, 2HRS seal on both sides, cage
The part of a rolling bearing which separates, retains and, where necessary, guides the rolling elements
made from glass fibre reinforced polyamide, 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_23137075211_en.gif

 
   

Figure 11
Double row stud type track roller with eccentric collar, sealing
See Seals
shield 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_23097382155_en.gif

 
 

Dimensioning

 
 

The methods for calculating 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
are:

 
 
  • 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
    to DIN ISO 281
  • the adjusted 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
    to DIN ISO 281
  • the expanded calculation of the adjusted reference 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
    to DIN ISO 281-4.
 
 

These methods are described in the chapter 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 life. For track rollers, the following values must be replaced:

 
 
  • Cr, C0r = Cr w, C0r w
    Effective basic dynamic or 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
  • Cur = Cur w
    Fatigue limit load
    Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

    See Contact surface
    as track roller.
 
imageref_17757187211_All.gif   Further equations for calculating 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
are given in the chapter Yoke type roller bearing
See Rolling bearing
track rollers, stud type roller bearing
See Rolling bearing
track rollers. The instructions and information provided there must be observed.
 
 

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 = C0r w/F0r

 

In addition to the basic rating life L, 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 1.

 

Equation 1
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_13999363979_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
C0r w
 N
Effective radial 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 in accordance with product table
F0r
 N
Maximum static radial load
A force which acts at an angle of b = 0°.
on track roller.
 
imageref_17757187211_All.gif   Track rollers
Barrel-shaped, tapered or cylindrical rolling elements
are regarded as heavily loaded at a 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 of S0 < 8. 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 factors of S0 < 1 cause plastic deformation
See Deformation
of the rolling elements and the raceways, which can impair smooth running. This is only permissible for bearings with small rotary motions or in secondary applications.
 
imageref_18348417035_All.gif   If an application has a 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 < 2, please consult Schaeffler.
 
 

Minimum load

 

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

See Contact surface
C0r w/Fr < 60

 

In order to ensure that the outer ring is driven, that no slippage occurs and that the track roller does not lift from the mating track, the track roller must be subjected to a minimum load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
in dynamic operation. In general, the minimum load
Load which, for example, is to be supported at a friction point. Also strain from pressure and/or heat.

See Contact surface
is calculated using the ratio C0r w/Fr < 60.

 
 

Design of bearing arrangements

 
 

Adjacent construction of yoke type track rollers

The value for dimension “d2” must not be less than the value stated

 

The abutment 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 bearings must be flat and perpendicular. Due to the contact pressure occurring, they must not be less than the dimension d2; see product tables for values ➤ dimension table.

 

Yoke type track rollers LR

 

Yoke type track rollers LR can be axially clamped or located by means of conventional fasteners such as snap rings.

 
 

Shaft tolerances

Tolerance class h6 Ⓔ

 

In general, yoke type track rollers
Barrel-shaped, tapered or cylindrical rolling elements
have point 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 inner ring. In order to ensure adequate support and to largely avoid fretting corrosion, the shaft tolerance should be in the tolerance class h6 Ⓔ.

 
 

Adjacent construction of stud type track rollers

The value for dimension “d2” must not be less than the value stated

 

The abutment 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 track rollers
Barrel-shaped, tapered or cylindrical rolling elements
must be flat and perpendicular. Due to the contact pressure occurring, they must not be less than the dimension d2; see product tables for values ➤ dimension table.

 

Lead chamfer

 

The lead chamfer on the locating bore must not be more than 0,5×45°.

 
imageref_17757187211_All.gif   Stud type track rollers ZL and KR must be axially clamped. The abutment surface for the nut must have sufficiently high strength
See Viscosity
and the tightening torque MA for the fixing nut must be observed; see product table for values ➤ dimension table. The roller stud can only transmit the permissible radial load
A force which acts at an angle of b = 0°.
if the correct tightening torque
Prescribed screw or nut tightening torque.
is applied. If the tightening torque
Prescribed screw or nut tightening torque.
for the nut cannot be adhered to, an interference fit is required.
 
 

Locating bore tolerance

Tolerance class H7 Ⓔ

 

For series ZL2, ZL52, KR52 and ZLE52, Schaeffler recommends locating bores to tolerance class H7 Ⓔ.

 
 

Mounting and dismounting

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

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.
 
 

Mounting guidelines for yoke type track rollers

Guidelines

 

If the tolerances
See
Running accuracy
Dimensional accuracy
are unfavourable, the yoke type track rollers
Barrel-shaped, tapered or cylindrical rolling elements
should be pressed onto the shaft or stud using a mounting press ➤ Figure 12. The inner ring must be fitted such that the pressing-in force is distributed uniformly on the end face of the inner ring. The press-in force
The force required to assemble parts having an interference fit, for example, to press a drawn cup needle roller bearing into a housing bore
must not be directed through the rolling elements. Ensure that the seals
Elements intended to prevent the ingress of gaseous, fluid and solid materials through the gaps formed by adjacent components whilst stationary or moving.

See
Seal
Operating life
Friction
are not damaged while mounting the yoke type track rollers. Yoke type track rollers
Barrel-shaped, tapered or cylindrical rolling elements
must be secured axially after mounting.

 
   

Figure 12
Mounting of yoke type track roller using a mounting press

Symbole/00016410_mei_in_0k_0k.gif  Mounting press

 

imageref_22456615307_All.gif

 
 

Stud type track rollers

Guidelines for mounting

 

Stud type track rollers
Barrel-shaped, tapered or cylindrical rolling elements
are mounted and dismounted using the methods applied to yoke type track rollers ➤ Figure 13. The tightening torques MA given in the product tables must be observed. It is only in this way that the permissible radial load
A force which acts at an angle of b = 0°.
can be ensured. Screws and nuts of grade 8.8 or better must be used.

 
   

Figure 13
Mounting of stud type track roller


 

imageref_22456618635_All.gif

 
 

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

 

 
 

For reliable and problem-free operation of track rollers, it is essential that attention is paid to the following information in the chapter Yoke type roller bearing
See Rolling bearing
track rollers, stud type roller bearing
See Rolling bearing
track rollers:

 
 
  • installation as yoke or stud type track roller ➤ link
  • permissible dynamic or static radial load ➤ link
  • load carrying capacity and life ➤ link
  • operating life ➤ link
  • minimum load ➤ link
  • angular 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.
    and tilting ➤ link
  • speeds ➤ link
  • lubrication ➤ link .
 
   
  
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