Bearing apparatus for crankshaft of internal combustion engine

摘要

A bearing apparatus for a crankshaft of an internal combustion engine having a main bearing 19 and a connecting rod bearing 23 is provided. The main bearing comprises a pair of semi-cylindrical bearings 17 and 18, only one of which has an oil groove 17a extending in a circumferential direction on an inner circumferential surface 17S thereof. The oil groove 17a is separated from an axial groove 24A formed at a joint portion of the semi-cylindrical bearings by a separation inner circumferential surface 17S' of which a length L 1 in the circumferential direction is smaller than a length L2 of an inlet opening 26 of a journal portion 10 in the circumferential direction. The connecting rod bearing also comprises a pair of semi-cylindrical bearings 21 and 22, and has axial grooves 54A and 54B and crush reliefs 62 and 64 with appropriate dimensions at joint portions thereof.