BEARING DEVICE FOR CRANKSHAFT OF INTERNAL COMBUSTION ENGINE

摘要

The invention provides a bearing device, including a crankshaft, a pair of half bearings each having crush reliefs formed adjacent to both circumferential ends thereof, a bearing housing in which a retaining hole is formed for retaining the pair of half bearings, and one half thrust bearing having a semi-annular shape arranged adjacent to the retaining hole. The half thrust bearing includes thrust reliefs formed adjacent to both circumferential end portions of a sliding surface receiving an axial force of the crankshaft so that its wall thickness is made thinner toward the circumferential end surface, and a thrust relief length at an inner end portion of the thrust relief positioned on a rear side in the crankshaft rotational direction is formed to be larger than a thrust relief length at an inner end portion of the thrust relief positioned on a front side in the crankshaft rotational direction.

主权项

1. A bearing device for a crankshaft of an internal combustion engine, comprising:
a crankshaft; a pair of half bearings for supporting a journal portion of the crankshaft, crush reliefs being formed on an inner circumferential surface of each half bearing and adjacent to both circumferential ends of the half bearing; a bearing housing having a retaining hole for retaining the pair of half bearings, the retaining hole being formed to penetrate through the bearing housing; and one half thrust bearing having a semi-annular shape that is arranged adjacent to the retaining hole on each axial end surface of the bearing housing, wherein at least one of the half thrust bearings comprises thrust reliefs on a front side and a rear side in a crankshaft rotational direction, the thrust reliefs being arranged adjacent to both circumferential end portions of a sliding surface receiving an axial force of the crankshaft, and being formed so that a wall thickness of the half thrust bearing is made thinner toward the circumferential end surfaces of the thrust bearing, and a thrust relief length at an inner end portion of the thrust relief positioned on the rear side in the crankshaft rotational direction is larger than a thrust relief length at an inner end portion of the thrust relief positioned on the front side in the crankshaft rotational direction.