Friction disc clutch for vehicles

Claim 1

In a friction disc clutch for motor vehicles of the type which includes an output shaft, a flywheel secured to an engine drive shaft and having a peripheral annular flange, an annular clutch cover connected to the free end face of said flange and having surfaces substantially parallel to said flywheel and an inturned inner edge substantially coaxial with said flywheel, a pressure plate with an annular circumferential edge mounted in said clutch cover, an annular dish spring supported at the outer and inner circumferences thereof respectively by said annular circumferential edge of said pressure plate and the annular inner edge of said clutch cover, and a clutch disc positioned between said flywheel and said pressure plate, said clutch disc conducting frictional driving engagement between said drive shaft and said output shaft when pressed with said flywheel and said pressure plate by means of resilient force of said dish spring, the improvement comprising a number of projections formed on said annular circumferential edge of said pressure plate to provide first air passage means between said annular circumferential edge of said pressure plate and one side of said dish spring, and a number of ventilating holes disposed radially through said inturned inner edge of said annular clutch cover to provide second air passage means at the other side of said dish spring.