Patent ID: 6857513

Claim:
A dual clutch transmission unit ( 1 ) for a motor vehicle ( 3 ) provided with an automatic gear change ( 5 ) comprising a first and a second ranks of gears, the transmission unit comprising: a rotary movement input member ( 45 ) adapted to be driven in rotation by an engine ( 4 ) of the motor vehicle ( 3 ), a first ( 29 ) and a second ( 30 ) movement output shaft adapted to be rigidly connected with respective input shaft ( 9 , 10 ) of the gear change ( 5 ) and associated with the first and the second ranks of gears respectively, a first ( 39 ) and a second ( 40 ) clutch device adapted to transmit the movement from the rotary member ( 45 ) to the first output shaft ( 29 ) and the second output shaft ( 30 ) respectively, and actuator means ( 15 ) for the engagement and disengagement of the first ( 39 ) and second ( 40 ) clutch devices and comprising a single actuator device ( 15 ) for disengaging one and, subsequently, engaging the other clutch device ( 39 , 40 ), wherein the actuator device ( 15 ) acts on the first ( 39 ) and second ( 40 ) clutch devices so as to maintain the first ( 39 ) and second ( 40 ) clutch devices in a first condition, in which the first ( 39 ) clutch device is engaged and the second ( 40 ) clutch device is disengaged, in a second intermediate condition, in which both the first ( 39 ) clutch device and the second ( 40 ) clutch device are disengaged, or in a third condition, in which the first ( 39 ) clutch device is disengaged and the second ( 40 ) clutch device is engaged.