Half bearing and plain bearing

摘要

A half bearing for supporting a crank shaft of an internal combustion engine is provided. The half bearing having a main semi-cylindrical part, two crush reliefs, and two transition regions. Each crush relief has a depth from a imaginary plane at a circumferential end surface of the half bearing greater than a depth from the imaginary plane at a connecting position between each crush relief and the transition region. A plurality of circumferential grooves extend in a circumferential direction in the main semi-cylindrical part along their entire length in the circumferential direction, and the plurality of circumferential grooves extend also in the transition region continuously.

主权项

1. A half bearing for supporting a crank shaft of an international combustion engine, the half bearing comprising:
a main semi-cylindrical part including a center portion of the half bearing in a circumferential direction; two crush reliefs, each crush relief having a thickness arranged at each circumferential end of the half bearing, the thickness of the crush relief being thinner than that of the main semi-cylindrical part; and two transition regions, each transition region having a thickness arranged between the main semi-cylindrical part and the crush relief, the thickness of the transition region being thinner towards the crush relief, wherein each transition region includes an inwardly convex curved surface projecting inwardly in a radial direction of the half bearing, wherein, an imaginary inner circumferential plane is coplanar with an inner circumferential surface of the main semi-cylindrical part, wherein for each crush relief a distance between the imaginary plane and the crush relief at a circumferential end surface of the half bearing is greater than a distance between the imaginary plane and a connection between the crush relief and the transition region, and wherein a plurality of circumferential grooves extend in a circumferential direction in the main semi-cylindrical part along an entire length of the main semi-cylindrical part, the plurality of circumferential grooves extend into the transition region, and the plurality of circumferential grooves all have the same groove width and the same groove depth, and the groove width and the groove depth are constant along the circumferential direction.