Thrust bearing for rotating shaft of vehicle driving motor

Abstract

Provided is a thrust bearing with which a rotating shaft and a sliding surface are not easily damaged by an electric discharge. A thrust bearing receives force acting in an axial direction of a rotating shaft of a vehicle driving motor. The thrust bearing includes: a metal base having an annular shape and an insulating layer. The metal base includes a first axial-directional end surface, a second axial-directional end surface, and two radial-directional end surfaces. The insulating layer covers at least the first axial-directional end surface and the two radial-directional end surfaces of the metal base. The metal base is constituted by a back metal layer and a bearing alloy layer positioned closer to the first axial-directional end surface than the back metal layer is. The radial-directional end surfaces are constituted by a first region and a second region positioned closer to the second axial-directional end surface than the first region is. The insulating layer covers, on the radial-directional end surfaces, only a whole of the first region. In the axial direction of the annular shape, a dimension of the first region is greater than a dimension of the bearing alloy layer and is less than or equal to 60% of a dimension of the metal base.

Dependencies are inferred from the claim text.