Cylindrical roller thrust bearings

  • Product features: Simple structure, easy to use; Less coefficient of friction, high limiting speed; The most mature process, can achieve very low noise level; Not impact resistant, not suitable for heavy loads; Vehicle-mounted design to provide bearing load capacity, thereby extending span life.
  • Main areas: Automobile, agricultural machinery, machine tools, motors, water pumps, textile machinery and other fields.

Cylindrical roller thrust bearings

Features

Cylindrical roller thrust bearings, consisting of two plane raceway washers (a shaft washer and a housing washer) and a cylindrical roller and cage assembly, are often used to carry very heavy axial loads. The cylindrical rollers are processed to a convex profile so that the pressure distribution between the roller and raceway contact surfaces becomes much even. Hence these bearings provide rigid bearing arrangements which can accommodate very high axial loads in one direction.

The designs of cylindrical roller thrust bearings are variable subject to the machine units to be accompanied. For example, if the fitting surfaces of the machine components have very high accuracy and sufficient hardness, the shaft washer and housing washer may not be required, that is the cylindrical roller and cage assembly is directly mounted with them. The HRB cylindrical roller and cage assembly has a form-stable cage fitted with a great number of rollers which have slight deviation in diameter. The cylindrical roller ends are strictly crowned to avoid edge stress concentration and furthermore to ensure even load distribution.

In addition to the complete bearings, their cylindrical roller and cage assembly can also be supplied.

Lubrication method: oil lubrication is adopted.

Dimensions

The boundary dimensions of the listed bearings conform to GB/T 4663.

Angular misalignment

For cylindrical roller thrust bearings, any angular misalignment of the shaft or shaft supporting surfaces relative to the housing is not allowed.

Tolerances

In accordance with GB/T 307.4, HRB cylindrical roller thrust bearings listed in the bearing tables are made to normal class tolerances. If bearings of higher accuracy are required, P6 and P5 class tolerances are available as well.

Fitting requirements for shaft and housing

The supporting surfaces of the shaft and housing must be strictly perpendicular to the axial so as to ensure even load distribution and long operating life.

Shaft and housing tolerances

Bearing part Shaft tolerance zone Housing tolerance zone
Shaft washer h8 –
Housing washer – H7

 

Minimum rolling bearing axial load

The minimum axial load for cylindrical roller thrust bearings is given by the equation:
Famin = A (n/1000)2
where
Famin: minimum required axial load, N
n: speed r/min
A: minimum axial load factor, given in the bearing tables

Equivalent dynamic bearing loads

P = Fa

Equivalent static bearing loads

P0 = Fa