BEARING DEVICE

摘要

A bearing device includes: a journal part, a main bearing, a cylinder block, and a bearing cap. One half bearing held by the cylinder block includes: a first circumferential oil groove and a second circumferential oil groove being formed at positions opposite to an inlet of an oil passage of the journal part; a separation part separating the first circumferential oil groove and the second circumferential oil groove; and an oil hole penetrating from the first circumferential oil groove to an outer circumferential surface. A length L1 in a circumferential direction of the separation part at a position in the inner circumferential surface of the one half bearing is smaller than a length L2 in the circumferential direction of the inlet of the journal part.

主权项

1. A bearing device for rotatably supporting a journal part of a crankshaft, comprising:
a journal part having an oil passage extending inside thereof and an inlet of the oil passage being open on an outer circumferential surface of the journal part; a main bearing being constituted of a pair of half bearings and rotatably supporting the journal part; and a cylinder block and a bearing cap being each formed with a holding bore for holding the main bearing, wherein one half bearing being held in the holding bore of the cylinder block includes: a first circumferential oil groove and a second circumferential oil groove being formed at positions opposite to the inlet of the oil passage of the journal part in an inner circumferential surface of the one half bearing; a separation part separating the first circumferential oil groove and the second circumferential oil groove; and an oil hole penetrating from the first circumferential oil groove to an outer circumferential surface of the one half bearing, and a length L1 in a circumferential direction of the separation part at a position in the inner circumferential surface of the one half bearing is smaller than a length L2 in the circumferential direction of the inlet of the journal part.