Patent ID: 7500416

Claim:
A filter for a motor vehicle transmission with an automatic gearchange, including a torsion damper ( 30 ) disposed between an input element adapted to be driven in rotation by a crankshaft ( 11 ) of an engine of a motor vehicle, and an output element adapted to be directly coupled to an input shaft of the transmission or driven shaft ( 21 ), the torsion damper including elastic means, the stiffness of the damper is variable, the output element comprising a central hub ( 26 ) for coupling to the driven shaft ( 21 ) and a collar portion ( 29 ) of the hub ( 26 ) being mounted elastically with respect to the hub ( 26 ), the torsion damper ( 30 ) being connected at one end thereof to the input element and at the other end thereof to the output element, the output element being centered by the driven shaft ( 21 ), the collar portion ( 29 ) being formed with a set of teeth ( 50 ) in mesh with a set of outer teeth ( 51 ) of the hub ( 26 ).