Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 08, 2024 - September 11, 2024
A mechanical tensioner system for a timing chain of an internal combustion engine consists of the leaf spring coiled on the backup spring and requires a stable friction resistance despite operating a starved lubricated condition. An effectiveness of the surface texturing to the leaf spring surface on stabilizing the friction resistance has been found. The present study describes a selection of the manufacturing process for the surface texturing consisting of aligned bumps. Electrochemical polishing, a laser abrasion and a micro milling using various cutting edges processes were applied. The residual stress and the hardness distribution measurement were connected to the endurance experiment. Results showed that the large tensile residual stress was distributed accompanied with excess hardening after the laser abrasion and that it was difficult to assemble the tensioner system. A small compressive residual stress accompanying without the excess hardening was found on textured surface using the micro milling with a ball end mill.
