THE EFFECT OF AGED FRICTION MATERIALS ON THE RELATIVE CONTRIBUTION OF THIN-FILM FRICTION TO OVERALL FRICTION IN CLUTCHES

摘要

In order to prevent shudder in automatic transmissions, friction must decrease as the sliding speed between the friction plates in clutches decreases. Theoretical and empirical studies have shown that friction in wet clutches is a combination of boundary friction and the friction due to flow of fluid through the friction material (thin-film friction) [1-6], The relative contribution of thin-film friction to overall friction varies with friction material as a result of differences in the ability of fluid to flow through friction material [6]. In this paper we investigate the effect of friction material degradation on the relative effect of thin-film friction to overall friction.