Dual flywheel for a transmission input clutch

Claim 1

A dual mass transmission input flywheel disposed for drive connection between an engine and a transmission comprising: a first flywheel mass drivingly connected to the engine and having formed thereon an engagement surface; selectively engageable friction clutch means having a friction disc disposed for engagement with said engagement surface, a single spring member for enforcing engagement of said friction disc with said engagement surface and a manually operable clutch release bearing means for controlling said spring member between a position enforcing engagement and a position permitting disengagement; a second flywheel mass disposed adjacent said clutch release bearing and being contactable thereby to enforce movement by said spring member in one direction when said spring member is enforcing engagement; a second clutch element disposed adjacent said second flywheel mass and being engaged therewith when said spring member is enforcing engagement, said second clutch element being limited in one direction of axial movement relative to said release bearing means; and a transmission input shaft drivingly connected to both said friction clutch means and said second clutch element whereby both said flywheel masses are disconnected from said transmission input shaft when said friction clutch means is disengaged.