Needle Roller Thrust Bearings

Needle roller thrust bearings are for heavy axial loads. They require a minimum axial space and are arranged rather stiffly. They can accommodate axial loads acting in one direction i.e. they are single direction bearings. It can take as less space as a thrust washer can. The roller, cage and the raceways can all be separated and be combined with washers of various designs.

Needle roller and cage thrust assemblies consist of a cage that guide and retain a large number of needle rollers. The cylindrical surface of the rollers is slightly relieved towards the ends to ensure an even load distribution and prevent the damage to the edges.

Bearing washers
Raceway washers are made of hardened carbon chromium (rolling bearing) steel. The raceways are ground and the bore and outside diameter are turned may be used both as shaft and as housing washers for bearing arrangements.

Thrust washers are made of spring steel and are hardened and polished. They enable bearing arrangements where, the adjacent machine components are not suitable as raceways, but do have adequate stiffness etc. The thrust washers can be used both as shaft and as housing washers.

Shaft and housing washers are used for high-speed applications when accurate centering of the bearing washers is required.

Dimensions - The dimensions of the needle roller and cage thrust assemblies correspond to ISO.

Tolerances -
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Misalignment - They cannot tolerate any misalignment of the shaft with respect to the housing or any angular misalignment.

Cage - Needle roller and cage thrust assemblies incorporate a form-stable cage of steel or sheet steel as standard, with the exception of those assemblies identified by the designation suffix TN which have an injection molded cage of glass fiber reinforced polyamide 6,6 .

Minimum Load - The requisite minimum axial load to be applied to needle roller thrust bearings can be obtained from

F_am = 0,0005 C₀

where
F_am = minimum axial load, kN
C₀ = basic static load rating, kN

This needs to be adhered to if the bearings have to operate at high speeds or are subjected to rapid changes in the direction of load.

Thrust Bearings :
Thrust Ball Bearings | Angular Contact Thrust Ball Bearings | Cylindrical Roller Thrust Bearings | Needle Roller Thrust Bearings | Spherical Roller Thrust Bearings | Taper Roller Thrust Bearings