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.

The outer rings have a crowned or cylindrical outside surface. Designs with a crowned outside surface are used where they are inclined in relation to the mating track and edge stresses must be avoided.

Ball bearing track rollers are available with an inner ring, with a stud and with a plastic tyre on the outer ring.

Yoke type track rollers with a crowned outside surface and stud type track rollers have a radius of curvature of R = 500 mm.

Yoke type track rollers with a cylindrical outside surface have the suffix X.

Yoke type track rollers have outer rings with a crowned or cylindrical outside surface, inner rings and ball and cage assemblies with plastic cages. They are similar in construction to deep groove or angular contact ball bearings and are mounted on shafts or studs.

Yoke type track rollers LR6, LR60 and LR2 are single row units, LR50, LR52 and LR53 are double row units.

Where an increased level of anti-corrosion protection is required, ball bearing track rollers are available by agreement and as a special design with the special coating Corrotect^®, see link.

Yoke type track rollers with the suffix 2RSR have lip seals on both sides. In some sizes, RS seals are fitted for reasons of space.

Double row yoke type track rollers with the suffix 2Z have sealing shields on both sides, bearings with the suffix 2RS have lip seals on both sides.

The yoke type track rollers are greased using a lithium soap grease to GA13. Double row yoke type track rollers can in some cases be relubricated via the inner ring.

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 stud type track rollers are available with and without an eccentric collar.

For ease of fitting, the roller stud has a thread or a threaded bore. For countertensioning during fitting, there is a slot, hexagonal socket or a flat area on the external thread.

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

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 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. In addition, more uniform load distribution is achieved when using more than one stud type track roller.

For countertensioning during fitting, this series has flat areas on both sides of the roller stud.

Stud type track rollers ZL2 and ZL52 have lip seals on the stud side and the suffix DRS. The opposite side can be sealed using the plastic cover supplied.

Series KR52 is sealed on both sides by lip seals and has the suffix 2RS.

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

The stud type track rollers are greased using a lithium soap grease to GA13; ZLE52 can be lubricated via the roller stud.

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.

Track rollers KLRU have an outer ring with a crowned outside surface. The radius of curvature is indicated in the dimension table.

Series KLRZ has a cylindrical outside surface.

The maximum radial load is determined by the permissible contact pressure; F_r per must not be exceeded.

The track rollers have gap seals on both sides (suffix 2Z) or lip seals (suffix 2RSR).

They are greased using a lithium soap grease to GA13 and cannot be relubricated.

Track rollers are suitable for temperatures from –20 °C to +120 °C, restricted by the grease, cage material and sealing ring material. The information on the operating temperature range in the section link, must be observed.

Track rollers with plastic tyre KLRU and KLRZ are suitable for operating temperatures from –20 °C to +80 °C, restricted by the grease, cage material, sealing ring material and the plastic tyre.

Suffixes for available designs: see table.

Schaeffler also supplies profiled track rollers LFR5 in which the outer ring has a gothic arch profile.

These profiled track rollers are preferably used with a shaft or circular section mating track.