NEEDLE ROLLER BEARING FOR CONNECTING ROD OF INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To obtain long service life even under the condition that thickness of an oil film is extremely small in low viscosity and diluted lubrication.;SOLUTION: Numerous recessed parts having a minute recessed shape are provided on a surface of at least a rolling body of the needle roller bearing for the connecting rod of the internal combustion engine in a random manner. Surface roughness parameter of the face provided with the recessed parts is in a scope of 0.4 to 1.0 μm, and an Sk value is -1.6 or less.;COPYRIGHT: (C)2006,JPO&NCIPI