Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : February 28, 2017 - March 03, 2017
The aim of this study is to clarify how lubricant additives used in fluids for belt type continuously variable transmissions (B-CVTFs) improve a gear pitting life with keeping a higher friction coefficient between the metal contacting surfaces. The metal-metal friction property was experimentally investigated by using a block on ring type tribometer, and the gear pitting life was evaluated by the standard FZG (Forschungsstelle fur Zahnrader und Getriebebau) gear test rig. As a result, a sort of extreme pressure agent was found to give a longer gear fatigue life with a keeping a higher friction coefficient between the metals. The difference in gear pitting life derived from extreme pressure agent would be more significant under a higher load condition on the gears. The tribofilms composed of calcium and phosphorus could minimize abrasion and adhesion in the contact regions of pinion tooth dedendum, leading to prevent from generating micropitting, consequently with a longer gear fatigue life.
