Abstract: The torque variation absorbing device comprises a driving plate, a flywheel, and a spring mechanism, a torque limiting mechanism and a hysteresis mechanism installed between the driving plate and the flywheel. The torque limiting mechanism is located radially inside of the spring mechanism and radially inside of an oil drain hole bored in the flywheel. The side plate at one side of the driving plate is bent toward the flywheel and covers a gap between the driving plate and the flywheel. The side plate at the other side of the driving plate is made of a steel plate and the load supporting points on both sides of the side plate are spaced from each other in the radial direction.

Abstract: 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.

Abstract: The torque variation absorbing device comprises a driving plate, a flywheel, and a spring mechanism, a torque limiting mechanism and a hysteresis mechanism installed between the driving plate and the flywheel. The torque limiting mechanism is located radially inside of the spring mechanism and radially inside of an oil drain hole bored in the flywheel. The side plate at one side of the driving plate is bent toward the flywheel and covers a gap between the driving plate and the flywheel. The side plate at the other side of the driving plate is made of a steel plate and the load supporting points on both sides of the side plate are spaced from each other in the radial direction.

Abstract: A clutch disk is provided of the type comprising a hub to be coupled with a torque output shaft, an inner hub flange fixed integrally to the hub, an outer hub flange disposed concentrically on the outside of the inner hub flange so that it can rotate within the extent of a predetermined angle by means of splines with respect to the inner hub flange, main and auxiliary disk plates disposed on each side of both the flanges which are to be coupled with a torque input shaft, and provision for a hysteresis effect including thrust material provided between the flanges and the main and auxiliary disk plates, which is characterized in that plate material for covering a torsion section cutout and a spline section formed between the inner and outer hub flanges is disposed between the thrust material for providing the hysteresis effect and both the hub flanges, and the plate material has a fixing section for making the plate material rotate together with the inner hub flange, whereby a stable hysteresis is obtained.