Valve lifter

摘要

The arithmetic mean roughness of the sliding surface of a valve lifter (1) before a film (2) of the valve lifter (1) is coated is made to be Ra 0.01 to 0.03 micrometers, and the maximum length of scratches on said surface of the base material is made to be equal to or less than 250 micrometers. ( With a structure of a valve lifter in which an amorphous film is coated on the sliding surface of the valve lifter, there are several issues such as wear on the sliding surface of the base material of the valve lifter, flaking of the film, aggressiveness to opposing material, and increase in wear of the cam.)