A dynamic damper device for absorbing a torsional vibration includes a rotary part, an inertia part, and an elastic part. The rotary part is a part to which the torsional vibration is transmitted, and is rotatable about a rotational center. The inertia part is provided on the rotary part so as to be movable in a radial direction with respect to the rotary part by a centrifugal force and be movable in a circumferential direction with respect to the rotary part by the torsional vibration. The elastic part couples the rotary part and the inertia part.

A dynamic vibration absorbing device inhibits fluctuations in rotational velocity of a rotary member. The dynamic vibration absorbing device includes a tubular member having an annular shape, the tubular member including a slit extending in a circumferential direction. The dynamic vibration absorbing device also includes at least one elastic member disposed inside the tubular member, the at least one elastic member disposed to be non-rotatable relatively to the tubular member. In addition, the dynamic vibration absorbing device includes a support member including an attachment part, a support part and a coupling part, the attachment part attachable to the rotary member, the support part disposed inside the tubular member, the support part disposed to be rotatable relatively to the tubular member, the coupling part coupling the attachment part and the support part through the slit.

A lock-up device includes an input-side rotary member, an output-side rotary member, an outer peripheral side torsion spring, a restriction member and a float member. The restriction member is attached to the output-side rotary member. The restriction member includes a first restriction part. The first restriction part is disposed at an interval from the output-side rotary member in an axial direction. The float member is rotatable relatively to the input-side rotary member and the output-side rotary member. An inner peripheral end of the float member is disposed between the output-side rotary member and the first restriction part in the axial direction.

A dynamic vibration absorber is disclosed. The dynamic vibration absorber includes a rotatable first hub, an inertia member, a plurality of elastic members, a plurality of sliders, and a guide member. The inertia member is disposed on an outer peripheral side of the first hub. The inertia member is rotatable relative to the first hub. The plurality of elastic members radially extend between the first hub and the inertia member. The plurality of elastic members are elastically deformable and elastically couple the first hub and the inertia member in a rotational direction. The plurality of sliders are radially movable along the plurality of elastic members. The plurality of sliders are configured to contact the plurality of elastic members. The guide member radially move the plurality of sliders. The guide member determines radial positions of the plurality of sliders.

A centrifugal pendulum absorber is provided. The centrifugal pendulum absorber includes a flange, a first mass fixed circumferentially movable with respect to the flange by first rollers along a first pendulum path, a second mass fixed circumferentially movable with respect to the flange by second rollers along a second pendulum path, and a spring connecting a circumferential end of the pair of first masses to a circumferential end of the pair of second masses. The first and second pendulum paths each include a middle region and circumferential ends extending radially inward from the middle region such that the first and second masses are movable radially inward such that the spring compresses when first and second masses are at the circumferential ends of the respective first and second pendulum paths.

A coupling arrangement is provided with a vibration reduction device and with a clutch device. The vibration reduction device has at least one torsional vibration damper, an input connected to a drive, and an output connected to the clutch device by which a connection between the vibration reduction device and a driven end is at least substantially produced in a first operating state, and this connection is at least substantially cancelled in a second operating state. The vibration reduction device has a mass damper system that cooperates with the torsional vibration damper and is connected to the output of the vibration reduction device.

A damper device is attached to a rotating shaft to suppress amplitude at resonance of the rotating shaft. The damper device includes: a damper housing formed annularly and concentrically with the rotating shaft; a plurality of mass bodies annularly arranged around the rotation shaft inside of the damper housing and configured to be movable in the diameter direction by centrifugal force; an annular elastic body, formed of a circular spring-shaped elastic body abutting on the outside of the plurality of the mass bodies, so as to bias the mass body inward; and a biasing member, being a leaf spring-shaped elastic body abutting on the outside of the annular elastic body, so as to bias the annular elastic body inward.

A vibration reduction device for reducing a torsional vibration from an engine includes an input rotary part, an output rotary part, a damper part, a dynamic vibration absorbing device, and a hysteresis torque generating part. The torsional vibration is input to the input rotary part. The output rotary part is disposed to be relatively rotatable with respect to the input rotary part. The damper part is disposed between the input rotary part and the output rotary part and attenuates the torsional vibration input to the input rotary part. The dynamic vibration absorbing device is for absorbing the torsional vibration output from the damper part. The hysteresis torque generating part is capable of generating a hysteresis torque when the damper part is in operation.

A dynamic vibration absorbing device includes a guide member having an annular shape. The dynamic vibration absorbing device also includes at least one mass body that rolls along the guide member. In addition, the dynamic vibration absorbing device includes at least one elastic member non-rotatable relatively to the guide member, the at least one elastic member disposed to restrict the at least one mass body from rotating relatively to the guide member.

Disclosed are damper assemblies for engine disconnect devices, methods for making such damper assemblies, and motor vehicles with a disconnect device for coupling/decoupling an engine with a torque converter (TC). A disconnect clutch for selectively connecting an engine with a TC includes a pocket plate that movably mounts to the TC. The pocket plate includes pockets movably seating therein engaging elements that engage input structure of the TC and thereby lock the pocket plate to the TC. A selector plate moves between engaged and disengaged positions such that the engaging elements shift into and out of engagement with the TC input structure, respectively. A flex plate is attached to the engine's output shaft for common rotation therewith. A damper plate is attached to the pocket plate for common rotation therewith. Spring elements mate the damper and flex plates such that the damper plate is movably attached to the flex plate.