The clutch cover is screwed to the engine
flywheel. It transfers the engine torque to the clutch disc on
the transmission input shaft.
The clutch cover is composed of the clutch housing and the diaphragm
spring which presses the axially displaceable pressure plate (
against the clutch disc and flywheel when the clutch is engaged.
Technically, the diaphragm spring is a disc spring with integrated
control levers (the diaphragm spring tongues). It is mounted in
such a way in the housing that it can be tilted by means of two
wire rings or one wire ring around a flanged edge . Diaphragm
spring, wire ring(s) and housing are connected to spacer bolts
The pressure plate is secured and adjusted concentrically on the
housing by leaf springs . Half of the engine torque is transferred
by the pressure plate and leaf springs, the other half is transmitted
directly from the flywheel to the clutch disc.
Two forces act on the clutch cover: the clamp load which causes
the pressure plate to press against the clutch disc, and the release
force which lifts the pressure plate away from the clutch disc
by means of the diaphragm spring tongues.