Scoring Control of Asbestos-Free Glass-Fiber Clutch Facing.

Recent manual transmissions are equipped with asbestos-free clutch facing. The authors have been developing organic-type facing materials for the past 10 years. Rubber with glass-fiber composite material has the features of long life, high-temperature durability, and mild friction characteristics in low-speed sliding contact, but is aggressive to the countersurface under some working conditions. This paper presents wear models of cast iron against glass-fiber material and shows the effect of porosity and chemical treatment of fibers on countersurface wear.