Torque transmission device for motor vehicle, has annular diaphragm compensating pressure acting on clutch activation unit for opposing activation of clutch from rest position when pressure is lower than preset threshold value

摘要

The device has a clutch (E1) mounted between a crankshaft (10) and a drive shaft (38). A clutch activation unit has a hydraulic jack (48) that is controlled by pressure of hydraulic liquid. An annular diaphragm (50) compensates the pressure acting on the activation unit for opposing the activation of the clutch from a rest position when the pressure controlling the jack is lower than a predetermined threshold value.