Improvements in bearing bushings

Bushing may refer to Bushing (bearing), a type of plain bearing or Bushing (isolator), a mechanical device used to reduce vibrations.

Here let us talk about a invention relates to improvements in for universal joints. Bearing bushings of the type to which the present invention relate typically have a thrust washer located on the bottom of the bearing bushing which has a contact surface for the cylindrical rollers and for the universal joint pin. Bearingbushings of this general type are not new per se. It is noted, however, that in these known bearing bushings, the lubrication between the end surfaces of thecylindrical rollers and the thrust washers in not sufficient, particularly under heavy axial loads. Furthermore, it has been observed that cracks form in these prior assemblies between the reinforced edge of the thrust washer and the contact surfacesfor the universal joint pin.

To this end, in accordance with the present invention, the thrust washer is provided with a plurality ofrecesses distributed about its periphery to locate it on the side facing away from the cylindrical rollers. These recesses extend radially inwardly from the lateral surface approximately over the length of the contact surface for the cylindricalrollers. In the particular thrust washer configuration described above, lubricant pockets for contact with the rollers are formed as a result of the shrinkage of the plastic after injection molding or casting. These pockets extend over the length of thecontact surface for the cylindrical rollers. Additionally, the wall thicknesses in the area of the reinforced edge are the same as in the central area of the thrust washer which means that no stress is developed when the plastic shrinks.