Patent ID: 7347122

Claim:
A transmission for a motor vehicle comprising: a drive shaft ( 11 , 111 ) coupled to an engine of the motor vehicle; an output shaft ( 19 , 119 , 219 ) coupled to the drive shaft releasably through a clutch; a gearbox ( 50 ) drivingly connected to the output shaft ( 19 , 119 , 219 ); and a filtering device provided for filtering out vibrations emitted and transmitted by the drive shaft ( 11 , 111 ) to the output shaft ( 19 , 119 , 219 ); the filtering device comprising a drive shaft damper ( 20 , 120 , 220 ) tuned to a frequency which is inside the range of frequencies to be damped out, and a modulating device of the electromagnetic type provided for matching the frequency of the damper ( 20 , 120 , 220 ) to the frequency of the vibrations transmitted by the drive shaft ( 11 , 111 ), wherein the clutch comprises a reaction plate ( 12 , 112 B) which is coupled to the drive shaft ( 11 , 111 ), a pressure plate ( 14 , 114 ) coupled to the reaction plate ( 12 , 112 B) but displaceable axially with respect thereto, the reaction plate ( 12 , 112 B) and pressure plate ( 14 , 114 ) being adapted to clamp therebetween, under the action of axially acting resilient means ( 15 ), a friction disc ( 16 , 116 ), the friction disc ( 16 , 116 ) having a hub ( 17 , 117 ) which is mounted on the output shaft ( 19 , 119 , 219 ).