A power transmission device includes a flywheel, a torque limiter unit, and a damper unit. The torque limiter unit includes first and second side plates and a friction plate. The first side plate is attached to the flywheel. The first side plate is disposed on a first axial side to the flywheel. The friction plate is disposed axially between the first side plate and the second side plate. The damper unit includes input rotational bodies, an output plate, and an elastic member. The output plate is disposed axially between the first side plate and the flywheel.

A damper device includes a first rotor, a second rotor, an elastic coupling part having first and second elastic members, and a hysteresis generating mechanism. The hysteresis generating mechanism includes a friction member, and generates a hysteresis torque. The friction member does not make frictional contact with the first and second rotors in a first torsion angular range where the torsion is caused between the first and second rotors by a first torsion angle from a neutral condition, makes frictional contact with the first or second rotor in a second torsion angular range exceeding the first torsion angle so as to generate the hysteresis torque, and does not make frictional contact with the first and second rotors in a predetermined torsion angular range within the second torsion angular range. In the neutral condition, the friction member is set in a neutral position by actuation of the elastic coupling part.

A centrifugal pendulum, including a rotation element and a pendulum flange. The pendulum flange is connected to the rotation element by means of a fastening means to transmit torque between the rotation element and the pendulum flange. The fastening means is designed in such a way that for the torque greater than a certain amount, some slip, or relative rotation, occurs between the pendulum flange and the rotation element.

A torsional vibration damper comprises an axially moveable locking piston including a piston plate, a torque input member including a cover plate, a support plate disposed axially opposite the cover plate and a supporting member mounted to both the cover and support plates, and a unitary radially elastic output member pivotable relative to and elastically coupled to the torque input member. The output member is disposed axially between the cover plate and the piston plate. The output member includes an output hub and a curved elastic blade configured to elastically and radially engage the supporting member and to elastically bend in the radial direction upon rotation of the cover plate with respect to the output member. The cover plate at least partially covers an axially first outer surface of the output member. The support plate partially covers an axially second outer surface of the output member.

A torque transfer mechanism includes an input member to receive an input torque from a propulsion source and an output member coupled to the input member to transfer the input torque to a driveline component. The torque transfer mechanism also includes a damping mechanism having at least one spring element to restrict relative rotation between the input member and the output member. wherein the at least one spring element defines a first spring rate corresponding to an initial range of travel that is less than a second spring rate corresponding to a subsequent range of travel.

A torsional vibration damper includes a planetary rotary unit and an elastic body that couples two rotary elements of three rotary elements so that the two rotary elements can rotate relatively to each other. The torsional vibration damper includes a shaft supporting member by which a rotation center axis of at least any one rotary element of the two rotary elements and a rotation center axis of the rotary element other than the planetary rotary unit and the two rotary elements are held on the same axis. The shaft supporting member has a holding section that is disposed in a position between fellow planetary rotary elements and not making contact with the planetary rotary elements and that fits with and thereby suppresses movement of the rotary element other than the planetary rotary unit and the two rotary elements in the axial direction.

A clutch disc assembly includes a hub flange, an output hub, an intermediate hub, a plurality of first elastic members, and a plurality of second elastic members. Power from an engine is input into the hub flange. The output hub can be coupled to an input shaft of the transmission. The intermediate hub is arranged between the hub flange and the output hub in a diameter direction such that relative rotation with the hub flange by an angle greater than or equal to a first angular range is prevented, and such that relative rotation with the output hub by an angle greater than or equal to a second angular range is prevented. The plurality of first elastic members couple the hub flange and the intermediate hub elastically in a rotation direction. The plurality of second elastic members couple the intermediate hub and the output hub elastically in the rotation direction.

A clutch disc assembly includes a hub flange, an output hub, an intermediate hub, a plurality of first elastic members, and a plurality of second elastic members. Power from an engine is input into the hub flange. The output hub can be coupled to an input shaft of the transmission. The intermediate hub is arranged between the hub flange and the output hub in a diameter direction such that relative rotation with the hub flange by an angle greater than or equal to a first angular range is prevented, and such that relative rotation with the output hub by an angle greater than or equal to a second angular range is prevented. The plurality of first elastic members couple the hub flange and the intermediate hub elastically in a rotation direction. The plurality of second elastic members couple the intermediate hub and the output hub elastically in the rotation direction.

A device for damping torsional oscillations including at least one support being displaced rotationally about an axis, a plurality of pendular bodies, each pendular body being mobile in relation to the support, and a friction-based connection between two circumferentially adjacent pendular bodies.

A power transmission device is disposed between an engine and a transmission so as to be capable of attenuating fluctuations in torque. The device includes an input rotary part, an output rotary part, an elastic part, an inertia mass part and an engaging part. The torque is inputted to the input rotary part. The output rotary part is rotatable relatively to the input rotary part. The elastic part elastically couples the input rotary part and the output rotary part in a rotational direction. The inertia mass part is movable in the rotational direction. The engaging part is engaged with the elastic part and the inertia mass part. The engaging part actuates the elastic part by relative rotation between the input rotary part and the output rotary part and movement of the inertia mass part.