INA ball bearing track rollers

INA ball bearing track rollers 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 are available for various applications with an inner ring, with a stud and with a plastic tyre on the outer ring.

INA ball bearing track rollers:

• are ready-to-fit, single or double row rolling bearings based on deep groove or angular contact ball bearings
• 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
• can support high radial loads
• tolerate axial loads which are due to small misalignment defects, skewed running or temporary contact running impacts
• are sealed on both sides
• are not mounted in a housing bore, but are supported on a flat mating track
• can be adjusted to the mating track in the design with the eccentric collar, thus permitting, for example, larger manufacturing tolerances in the adjacent construction

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

INA yoke type track rollers and stud type track rollers with a crowned outside surface have a radius of curvature of R = 500 mm. Yoke type track rollers with a cylindrical outside surface have the suffix X.

The crowned outside surface prevents edge stresses under skewing

INA yoke type track rollers 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

Corrosion protection by Corrotect

Special coating Corrotect

For applications requiring increased protection against corrosion, yoke type track rollers with the special Cr(VI)-free coating Corrotect are available by agreement as a special design; description of Corrotect

INA yoke type track rollers

Comparable in design to deep groove or angular contact ball bearings

INA yoke type track rollers are similar in construction to deep groove or angular contact ball bearings and are mounted on shafts or studs. They have outer rings with a crowned or cylindrical outside surface, inner rings and ball and cage 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 INA yoke type track rollers LR52 and LR53 has been optimised. This has brought about an increase in load carrying capacity and speed in continuous operation, and in grease lubrication nD G. These INA yoke type track rollers are X-life bearings.

Yoke type track rollers, sealed on both sides
Fr = radial load
Fa = axial load

1, Single row, lip seals, with radial sealing action (LR6..‑2RSR)
2, Double row, sealing shields (LR52..-2Z)

INA stud type track rollers

Heavy-section roller stud, with or without eccentric collar

INA stud type track rollers have outer rings with a crowned outside surface, heavy-section roller studs and ball and cage assemblies with plastic cages. The yoke type track rollers are available with and without an eccentric collar.

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

• with a threaded hole and mounting slot 
• with an external thread and hexagonal socket 
• with an external thread and flat areas on both sides.

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

Design without eccentric collar

Stud type track rollers without an eccentric collar are suitable for applications where a defined requirement for adjustment in relation to the mating track on the adjacent construction is not required.

Stud type track rollers, without eccentric collar, short roller stud with threaded hole, sealed on both sides
Fr = radial load
Fa = axial load

1, Single row, lip seal on stud side plus sealing shield and cover (ZL..-DRS)
2, Double row, lip seal on stud side plus sealing shield and cover (ZL52..-DRS)

Stud type track roller, without eccentric collar, long roller stud with external thread, sealed on both sides
Fr = radial load
Fa = axial load

1, Double row, lip seals, with axial sealing action (KR52..-2RS)

Design with eccentric collar

INA stud type track rollers ZLE52 have an eccentric collar. The eccentric collar can be used to set 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 can be tolerated in the adjacent construction. The load distribution when several stud type track rollers 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.

INA track rollers 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). Polyamide can tolerate higher specific contact pressures than elastomer and is relatively resistant to abrasion. These track rollers 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.

Cages of INA ball bearing track rollers

Solid cages made from polyamide PA66 are used as standard

The cages used in the INA ball bearing track rollers 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 in the X-life design have an optimised polyamide cage as standard.

Internal clearance

INA track rollers are manufactured as standard with radial internal clearance CN (normal). CN is not stated in the designation.

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 and measurement forces (without elastic deformation).

Suffixes for INA ball bearing track rollers