Timken Thrust Spherical Roller Bearings TSR-EJ TSR-EM

Thrust spherical roller bearings TSR-EJ and TSR-EM for heavy axial loads

Timken thrust spherical roller bearings (type TSR) are designed with spherically contoured rollers arranged in a steep angular configuration. This gives high thrust capacity with low friction and continuous roller alignment. In addition to axial load they can accommodate moderate radial load, and they keep working when the shaft and housing are or become misaligned under load.

Timken describes these bearings as preferred when conditions include heavy loads, difficulty in establishing or maintaining housing alignment, or expected shaft deflection. Internal self-alignment compensates for shaft deflection and housing distortion, so elevated edge stress on the rollers, which limits life in other bearing types, does not develop.

Technical specifications

Sample TSR-EJ sizes from the catalog table, with bore d, outside diameter D and height T in mm, static load rating Ca0 and dynamic load rating Ca in kN, and weight in kg:

Cages, lubrication and mounting

Timken thrust spherical roller bearings are now offered with the maximum-capacity E-type cage construction. Bearings with a bore under 320 mm are typically TSR-EJ with a window-type steel cage, while larger bores are typically TSR-EM with a finger-type brass cage that supports a higher dynamic load rating. The catalog also gives minimum working thrust load guidance, shoulder diameters and housing and shaft dimensions in each table row.

Because the rollers are driven by axial load, a minimum working thrust load is required to keep the rollers properly guided, and lubrication with extreme-pressure additives is advised for high thrust. The preferred oil inlet is at the bore, where centrifugal force carries the lubricant radially out to the rollers. Because spherical alignment tolerates deflection, welded housing frames can be used instead of complex castings.

Confirm the shaft and housing seat dimensions, the shoulder diameters listed beside each bearing, the lubricant viscosity and the expected thrust load before ordering. Shaft and housing seats should be square to the axis of rotation, and the catalog tolerance tables for thrust spherical roller bearings give the allowed variation of bore, outside diameter and height for each tolerance class.

Documents and quotation

The attached Timken Thrust Bearing Catalog covers thrust ball, cylindrical, spherical and tapered roller types, with engineering formulas, tolerances and the TSR tables. Related bearings are grouped under Electric Motors, Pumps and Turbines. To request a quotation from Seven Star LLC, an independent supplier in Muscat, send the complete designation, cage type and quantity.