Damping device for absorbing rotation shocks, and a friction clutch including such a device

A damping device (10) for absorbing rotation shocks, comprising damping means which are disposed between coaxial rotating parts (12, 14) that are arranged to be coupled in rotation, respectively, to the combustion engine of a motor vehicle power unit, and the input shaft of a gearbox of the power unit, being also of the type in which the damping means comprise at least one block of elastically deformable material (56A, 58A, 56B, 58B), which is interposed between the two rotating parts (12, 14) and on which there acts a mechanism comprising a cam (46A, 46B) which is coupled in rotation to one (12) of the two rotating parts (12, 14), together with a cam follower element (64A, 64B) which is coupled in rotation to one (12) of the two rotating parts (12, 14) wherein, the cam (46A, 46B) is formed on a tilting member (42A, 42B) which is articulated on a first one (12) of the two rotating parts (12, 14) about a pivot (40A, 40B) which is eccentric with respect to the axis (X--X) of rotation of the two rotating parts (12, 14), the cam follower element is a roller (64A, 64B), which is carried by the second rotation part (14A, 66A, 66B) and which cooperates with the cam (46A, 46B) when one of the two parts (12, 14) rotates with respect to the other in a first direction of rotation, the axis (66A, 66B) of the roller (63A, 64B) is eccentric with respect to the axis (X--X) of rotation of the two rotating parts (12, 14) and the tilting member (42A, 42B) includes a flyweight (60A, 60B) which is adapted to cause it to tilt under the effect of centrifugal force.