Half thrust bearing and bearing device using the same

Abstract

A half thrust bearing having a semicircular shape includes a thrust bearing body having a slide surface that receives an axial force from a crankshaft, and thrust reliefs formed adjacent to respective end portions of the thrust bearing body. Wall thicknesses of the thrust reliefs decrease to the respective end portions. Each thrust relief length continuously increases in a direction from an inner circumference to an outer circumference of the half thrust bearing. Each thrust relief length is a length, in a direction perpendicular to a plane that includes an end portion of the half thrust bearing, from the plane to a point at which a surface of each thrust relief intersects an inner circumference of the thrust bearing body. The half thrust bearing includes a bearing alloy layer and a resin slide layer, or additionally a back metal layer. The slide surface includes the resin slide layer.