Torque variation absorbing device

摘要

A torque variation absorbing device comprises a driving member, a driven member and a damping mechanism and a torque limiting mechanism interposed between the driving member and the driven member. The damping mechanism comprises a coil spring extending in the circumferential direction of the device and seat members provided at both ends of the coil spring. A center of each end of the coil spring is positioned nearer to a center of mutual rotation between the driving member and the driven member than a center of inclining of the seat member. A ratio of driving side moment of inertia to the driven side moment of inertia is set between 0.7 and 1.4. Further, a gap is provided in the circumferential direction between the seat member of the damping mechanism and at least one of the driving member and the driven member to which the seat member is opposed.