Abstract: In a damper device, a dynamic damper is coupled to a first intermediate member, first and second inner-side springs that act in series with each other are straight coil springs disposed between a second intermediate member and a driven member so that outward movement of the springs in a radial direction of the damper device is restricted at respective both ends, and a gap is formed between each body portion of the first and the second inner-side springs and the second intermediate member or a spring abutment portion of the driven member.

Abstract: A torque converter includes a lock-up device that directly connects a torque converter cover that rotates together with a pump impeller to a turbine runner connected to an output axis. The lock-up device includes a damper spring in a clutch piston that contacts with or moves away from the torque converter cover. In addition, an intermediate member is provided inside the damper spring. A center part of the damper spring is projected toward the inner side of the clutch piston in the radial direction by damper pressing portions and fixed to both ends of the damper spring and a connecting member and pushed onto the projecting part of the intermediate member.

Abstract: A torque converter assembly includes a pump and a turbine fluidly connected together. A vehicle includes the assembly operable between an output shaft of an engine and an input member of a transmission. The assembly includes a damper and a clutch operable between the pump and the turbine. The damper is operable upstream from the clutch such that oscillation from the pump is reduced by the damper before oscillation reaches the clutch. The clutch includes first and second plates and a friction plate disposed between the first and second plates. The assembly includes a casing that contains the pump, the turbine, the damper and the clutch. A first part of the casing and the first plate define a first chamber. A first part of the turbine and the second plate define a second chamber. The clutch between the first and second plates defines a third chamber.

Abstract: A dynamic vibration absorbing device includes a tubular member having an annular shape. The dynamic vibration absorbing device also includes at least one elastic member disposed inside the tubular member so as to be non-rotatable relatively to the tubular member. The dynamic vibration absorbing device further includes at least one mass body disposed inside the tubular member so as to be rotatable relatively to the tubular member.

Abstract: 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.

Abstract: A torque converter comprising: first and second cover plates arranged to receive torque; a flange; a turbine shell independently rotatable relative to the flange; at least one resilient element, at least partially disposed axially between the first and second cover plates, for transmitting a torque force between the flange and the first and second cover plates; a first axial gap, disposed between the flange and the first cover plate, having a first width; a second axial gap, disposed between the flange and the second cover plate, having a second width; one of the first cover plate or the second cover plate having at least one ramp protruding in an axial direction toward the flange, the ramp rotatably engageable with the flange for urging the flange axially in a direction toward the cover, and for transmitting an axial force for urging a clutch to engage.

Abstract: A lock-up device includes a drive plate, a driven plate, first torsion springs, second torsion springs, a spring holder and a rotation restricting unit. The rotation restricting unit is configured to restrict and bring the first torsion spring in each group and the second torsion spring in each group to a deactivated state by at least either of engagement of the spring holder with the driven plate or engagement of the drive plate with the spring holder.

Abstract: In some embodiments, a torque damper apparatus can achieve reduced stiffness as well as sufficient vibration absorbing property while increasing the dampening ratio of the torque variation. In some embodiments, a torque damper apparatus comprises an input member to which an engine torque is inputted; damper springs able to absorb variation of torque inputted from the input member; and/or a driving power of the engine configured to be transmitted to an output shaft of a vehicle via the input member and the damper springs. The damper springs can comprise a plurality of coil springs arranged along the circumference of the input member. The torque damper apparatus can further comprise a plurality of separate members interposed between the damper springs and configured to be independently rotated with respect to each other when the engine torque is transmitted thereto.

Abstract: A torsion damping device (10) of an automotive temporary coupling system, comprising: a torque input element (12A, 12B) and a torque output element (18); an upstream circumferentially acting elastic member (36A) capable of being loaded by or of loading the input element (12A, 12B); a downstream circumferentially acting elastic member (36B) capable of loading or of being loaded by the output element (18); a radial phase washer (40A, 40B) arranged so that the two elastic members (36A, 36B) are mounted in series; each elastic member (36A, 36B) is received circumferentially between a phasing face (50A, 50B) and an oppositely located radial retention face (52B, 52A) of the phase washer (40A, 40B), the circumferential distance (D) between said faces (50A, 50B, 52B, 52A) being equal at most to the circumferential length of the elastic member at rest.

Abstract: A device (10) for damping torsion between a clutch element (16) and a transmission shaft, comprising: an input washer (12A, 12B) that is rotationally integral with the clutch element (16); two output webs (18A, 18B) that are rotationally integral with the transmission shaft by means of a central hub (20); a pair of circumferentially acting elastic members (42) that are interposed circumferentially in series between the input washer (12A, 12B) and the output web (18A, 18B); a phase washer (44) that is interposed circumferentially between the two elastic members (42) of said pair.

Abstract: A hydrokinetic torque coupling device comprises a turbine, a driven plate non-rotatably attached to the turbine, circumferentially oriented torque transmitting elastic elements, and a friction disc including peripheral, axially extending driving tabs. The driven plate includes circumferentially oriented centering slots such that the axially extending driving tabs of the friction disc protrude into the centering slots and engage the elastic elements. A method for assembling a hydrokinetic torque converter involves providing a driven plate including circumferentially oriented centering slots, elastic elements and a friction disc including peripheral axially extending driving tabs, mounting the friction disc and the elastic elements to the driven plate so that the driving tabs of the friction disc and the driven plate engage the elastic elements, and centering the friction disc with respect to the driven plate by protruding the driving tabs into the centering slots of the driven plate.

Abstract: The lock-up device includes an input rotary member, an output rotary member, an elastic member and a support member. The elastic member elastically couples the input rotary member and the output rotary member in a rotational direction. The support member is rotatably disposed relatively to the input rotary member and the output rotary member. The support member has a support part supporting the elastic member and an engaging part engaged with the elastic member in the rotational direction. The support part of the support member herein has an outer peripheral side support portion supporting the outer peripheral side of the elastic member. Further, the outer peripheral end of the outer peripheral side support portion has a curvature continuously reduced in proportion to distance from the engaging part in the rotational direction.

Abstract: A damper unit having at least two series-connected damper units arranged offset from each other in a radial direction, each including two damper parts that are coupled to each other by means of spring units and a speed-adaptive absorber which is at least indirectly coupled to the connection between the two dampers, wherein the speed-adaptive absorber is arranged between the spring units of both dampers in a radial direction.

Abstract: The present invention is a double path torsion isolator for use in conjunction with a torque converter. Each of the two vibration paths includes a flange with a spring connection to each of the torque converter cover and an output connection attached to the transmission shaft. The torque converter turbine is connected to one of the flanges to provide a different frequency to the associated vibration path. When the lockup clutch is engaged, the engine vibration is divided along the two vibration paths toward the common output connection. The vibration frequency of the paths are adjusted so that the frequencies of the two paths are 180° out of phase at the output connection providing a vibration cancellation effect to the output connection.

Abstract: A clutch assembly and damper arrangement is provided that includes a driver hub and a driven element coupled to the driver hub by a compliance element. A clutch is provided that is selectively engageable to the driven element. The clutch has a housing supporting the compliance element and is torsionally unitary with the driven element.

Abstract: An embodiment provides a friction clutch apparatus that includes a disk assembly disk. The disk assembly has a disk portion selectively coupled to a first member, and a hub portion selectively coupled to a second member. The hub portion is generally axially aligned with the disk portion. The disk portion is rotatable relative to the hub portion. The disk assembly selectively transmits a torque between the first member and the second member. The disk assembly also includes an energy storage member selectively damping the relative rotation between the disk portion and the hub portion. The damping includes relative rotation between the disk portion and the hub portion. The energy storage member is preloaded, thereby requiring a preselected amount of torque to be applied by one of the disk portion and the hub portion to the other of the disk portion and the hub portion prior to the relative rotation.

Abstract: A torsional vibration damper for a bridging clutch of a hydrodynamic clutch arrangement is provided with a drive-side transmission element and a takeoff-side transmission element, which can be deflected around a certain angle of rotation relative to the drive-side element against the action of energy storage devices, where at least one driver element with an actuating function is assigned to each energy storage device. To realize a multi-stage action of the energy storage device, at least some of these driver elements arrive in working connection with an assigned final turn of the corresponding energy storage device only after using up a predetermined clearance gap in the circumferential direction. For this purpose, at least one transmission element has openings to accommodate energy storage devices, and at least one circumferential boundary of each opening is provided as a driver element for the assigned energy storage device.

Abstract: A torsional vibration damping disk with a base body which has a circumferential edge on the outside which is partially turned back in order to form receiver spaces for spring elements, in particular for bow spring elements. In order to create a torsional vibration damping disk which has a long service life at high rotational rates, a reinforcement strap, the free end of which is fastened to the base body, extends out from the circumferential edge in the area of at least one receiver space.

Abstract: A torsional vibration damper hub for a vehicle clutch includes a first row of springs extending substantially in the clutch rotating direction and disposed in openings formed in first inner annular plate and first pair of outer annular plates; second row of springs extending substantially in the clutch rotating direction and disposed in openings formed in the second inner annular plate and the second pair of outer annular plates; the first and second row of the springs being arranged on same radius from center of rotation of the clutch; the springs in the first row of springs arranged in one first axial level are axially overlapping the springs in the second row of springs arranged in a second axial level with the purpose to decrease a total axial length of the clutch. In an alternative embodiment the damper hub is substantially identical to a dual damper hub in conventional twin-plate clutches.

Abstract: A torsional vibration damper includes: a primary mass defining a substantially, ring-shaped chamber that is divided into at least two portions; a secondary mass relatively rotatably connected to the primary mass; and a plurality of damping units disposed in the divided portion of the ring-shaped chamber for coupling the primary and secondary masses to each other in a rotatable elastic manner. Each of the damping units includes a plurality of coil springs, and outer and inner wedge-shaped friction guides. The coil springs are situated in series and disposed one after the other within the divided portions of the ring-shaped chamber. The outer and inner wedge-shaped friction guides face each other along facing surfaces thereof. Each of the facing surfaces of the outer and inner wedge-shaped friction guides are entirely slanted with respect to a radial direction of the primary mass.

Abstract: A torsional vibration damper, especially a dual-mass flywheel, has a primary side and a secondary side, which is free to rotate around an axis of rotation relative to the primary side. Starting from a rotation in a direction of rotation around a forward base angle (?), a forward base spring arrangement exerts a forward base restoring force on the secondary side. Starting from rotation around a forward auxiliary angle (?), which is greater than the forward base angle (?), a forward auxiliary spring arrangement exerts an additional forward auxiliary restoring force. Upon rotation around a forward limit angle (?), both spring arrangements come to a stop together.

Abstract: A damper mechanism having preferable torsion characteristics that exhibit different characteristics on positive and negative sides by way of a simplified structure is provided. In the damper mechanism, a hub 6 is rotatable with respect to plates 12 and 13. Coil springs 33 are compressed on positive and negative sides of torsion characteristics. Elastic members 36 are arranged to operate in a rotating direction in parallel with the coil springs 33. The elastic members 36 are compressed on the positive side of the torsion characteristics, but are not compressed on the negative side of the torsion characteristics until a torsion angle exceeds a predetermined value. The elastic members 36 generate a frictional resistance when being compressed in the rotating direction, but no other friction generating mechanism is employed.

Abstract: The present invention aims to provide a damper assembly in which, even if excessive load is received from an engine and if spring constants of springs arranged in series are changed, the springs are not damaged. The present invention further aims to make the damper assembly more compact. The damper assembly comprises a retainer plate and a driven plate and is designated so that springs are held in series through an intermediate member, and a relative angle between the retainer plate and the intermediate member is regulated by engaging a first projection provided on the intermediate member with a containing portion provided in the retainer plate and a relative angle between the retainer plate and the driven plate is regulated by engaging a second projection provided on the retainer plate with an abutment portion provided on the driven plate.

Abstract: A damper assembly for a friction clutch includes a first and second series of springs arranged by a first and second series of spring pockets disposed around the outer circumference of the clutch. Vertical flange sections are configured to influence the springs against perpendicular walls of the damper minimizing frictional input. An arm ring of a turbine assembly rotatably communicates with the first series of springs to displace them a predetermined distance. Subsequent rotation of the arm ring displaces the second series of springs along with continuous displacement of the first series of springs creating a multi-rate damper.

Abstract: The invention relates to hydrodynamic torque converter comprising a pump wheel which is arranged inside of a housing, a turbine wheel, a stator, a torque converter lock-up clutch and a torsional vibration damper. The turbine wheel has a turbine hub which is axially and rigidly mounted on a drive hub of the torque converter in an axial direction to the drive hub by means of at least one axial bearing. The turbine hub is mounted in a radial direction by means of a radial bearing. A connection with circumferential backlash is provided between the turbine hub and the drive hub by means of a disengaging gear. The invention also provides a rotationally fixed connection by means of an engaging gear located between the input component of the torsional vibration damper and the turbine hub, whereby the engaging gear and the disengaging gear are arranged on an essentially same axial position and radially within one another.

Abstract: A torsional vibration damper including a disk-shaped first damper part, a second damper part which is rotatable about an axis with respect to the first damper part, and a torsion spring arrangement with at least one torsion spring unit. The at least one torsion spring unit includes at least two springs which are arranged substantially following one another in the circumferential direction. Further, there is at least one intermediate ring element which is rotatable about the axis with respect to the first damper part and the second damper part and with at least one spring contact arm for the at least one torsion spring unit. The spring contact arm extends substantially radially with respect to the axis. The at least one intermediate ring element has a radial movement restraining component for protecting the at least two springs against a movement in the radial outward direction in their end regions facing the at least one spring contact arm.

Abstract: A damper mechanism is provided for achieving a low rigidity in a small torsion angle region as well as a high rigidity in a large torsion angle region, and particularly the damper mechanism employing a stop mechanism having a reduced circumferential space. The damper mechanism 4 includes an output rotary hub 110, an input rotary member 2, a hub flange 12, a first spring 9, a second spring 10, a second stop 17 and a compressing portion 18. First and second springs 9 and 10 connected in series with the hub flange 12 arranged between them are disposed circumferentially between the output rotary hub 110 and the input rotary member 2. The second spring 10 in the initial state is kept and compressed in the rotating direction between the hub flange 12 and the input rotary member 2. When the torsion angle reaches the first torsion angle, the second stop 17 stops relative rotation between the output rotary hub 110 and the hub flange 12.

Abstract: A damper disk assembly is provided for use in a clutch device. The damper disk assembly has a pair of plates 5 and 6 (rotary member) elastically coupled to the hub flange 8 (rotary member) by a damper mechanism 4. The damper mechanism 4 is designed to reduce disadvantages due to nonparallel compression of an elastic member in the damper disk assembly. The damper mechanism 4 includes a plurality of coil spring assemblies 13. The coil spring assemblies 13 have a large coil spring 30, a small coil spring 31 and a pair of spring seats 34. The paired spring seats 34 are arranged on the circumferentially opposite ends of the small coil spring 31. The spring seats 34 support the circumferentially opposite ends of the small coil spring 31, and are engaged with the inner side of the small coil spring 31. The spring seats 34 are supported for rotation with respect to two kinds of rotary members around a shaft parallel to a rotation axis of the rotary members.

Abstract: The invention relates to hydrodynamic torque converter comprising a pump wheel which is arranged inside of a housing, a turbine wheel, a stator, a torque converter lockup clutch and a torsional vibration damper. The turbine wheel has a turbine hub which is axially and rigidly mounted on a drive hub of the torque converter in an axial direction to the drive hub by means of at least one axial bearing. The turbine hub is mounted in a radial direction by means of a radial bearing. A connection with circumferential backlash is provided between the turbine hub and the drive hub by means of a disengaging gear. The invention also provides a rotationally fixed connection by means of an engaging gear located between the input component of the torsional vibration damper and the turbine hub, whereby the engaging gear and the disengaging gear are arranged on an essentially same axial position and radially within one another.

Abstract: A lockup device 6 of a torque converter 1 includes a damper mechanism 31. The damper mechanism 31 includes a drive plate 36, a driven plate 35, coil springs 37 and a ring 38. The coil springs 37 transmit a torque between the drive plates 36 and driven plate 35. The coil springs 37 are aligned in the rotational direction of the torque converter 1, and extend in the rotating direction. The ring 38 allows movement of the coil springs 37 in rotational directions, while preventing movements in other directions. The ring 38 is supported by one of the drive and driven plates 36 and 35, and extends through the coil springs 37. The ring 38 allows an increase in coil diameters of the coil springs 37 that are used in the lockup device 6 of the torque converter 1.

Abstract: A lockup device 6 is provided for a torque converter 1 that allows for the use of larger torsion springs 50. The lockup device 6 of the torque converter 1 includes a piston 8 and a damper mechanism 13. The piston 8 constitutes a clutch together with a front cover 3. The damper mechanism 13 includes a drive plate 9, a driven plate 10 and coil spring assemblies 12. The drive plate 9 is secured to one axial side surface of the piston 8. The coil spring assemblies 12 couple the drive plate 9 and the driven plate 10 in a rotational direction. Cutouts 41 are formed in the drive plate 9 at positions corresponding to positions of the coil spring assemblies 12. Each coil spring assembly 12 is received within the corresponding one of the cutout 41 and is axially supported by the one axial side surface of the piston 8.

Abstract: A lockup damper included in a lockup mechanism 8 of a torque converter 1 includes a piston member 9, a driven member 10, coil springs 13 and seat members 40. The coil spring 13 is arranged between the piston member 9 and the driven member 10. The seat member 40 is attached to the driven member 10, has a loose-fit portion 40c loosely fitted to the end of the coil spring 13, and restricts the radially outward movement of the end of the coil spring 13 by the loose-fit portion 40c fitted into the coil spring 13.

Abstract: The hydrodynamic torque converter (1) comprises a pump wheel (4) in a casing (2,3), a turbine wheel (5) and a turbine distributor (6). There is also a bypass coupling (70) including an axially moving piston, a torsional oscillations absorber (40) with input and output parts rotating relative to each other in opposition to force accumulators. Its turbine wheel comprises a hub (13) housed axially on the torque converter output hub (15). A connection with the rotational clearance, the splines (32,34), is provided between the two hubs. A fixed connection, by splines (34,41a) is between the input part of the absorber and the turbine wheel hub. The two sets of splines are in the same axial position radially one in the other.

Abstract: A piston (2) is disposed between a front cover and a turbine of a torque converter and is adapted to move in an axial direction in response to changes in the hydraulic fluid pressure. The piston (2) includes a disc-shaped plate portion (11), a flat annular portion (12), and an annular rim portion (13). The flat annular portion (12) is formed at an outer periphery of the disc-shaped plate (11), and is adapted to frictionally engage a portion of the front cover. The annular rim portion (13) is formed on an outer peripheral edge of the flat annular portion (12) and extends axially toward the turbine. The annular rim portion (13) supports the radial outer side of torsion springs disposed on an inner periphery thereof. By forming notches (14) in the annular rim portion (13), the rigidity of the flat annular portion (12) is reduced.

Abstract: A torque transmitting apparatus which can be used in the power train between the prime mover and the transmission of a motor vehicle has a first flywheel connectable to the prime mover, a second flywheel coaxial with and receiving torque from the first flywheel by way of a damper, and a friction clutch which can be engaged to transmit torque between the second flywheel and the input element of the transmission. The energy storing elements of the damper and the bearing between the two flywheels are installed radially inwardly of the friction surfaces of the second flywheel and the axially movable pressure plate of the friction clutch. This renders it possible to reduce at least the radial dimensions of the apparatus without reducing the diameters of the friction surfaces.

Abstract: A lockup damper included in a lockup mechanism 8 of a torque converter 1 includes a piston member 9, a driven member 10, coil springs 13 and seat members 40. The coil spring 13 is arranged between the piston member 9 and the driven member 10. The seat member 40 is attached to the driven member 10, has a loose-fit portion 40c loosely fitted to the end of the coil spring 13, and restricts the radially outward movement of the end of the coil spring 13 by the loose-fit portion 40c fitted into the coil spring 13.

Abstract: A clutch disk assembly 1 includes an output rotary member 4, an intermediate member 3, first springs 7, a damper 8, plates 12 and 13, and third springs 5. The intermediate member 3 is disposed radially outside the output rotary member 4. The first springs 7 are arranged between the output rotary member 4 and the intermediate member 3, and are circumferentially compressed when a hub and the intermediate member 3 rotate relatively to each other in a first stage of relative rotary displacement. A damper 8 is disposed between the output rotary member 4 and the intermediate member 3, and includes second springs 10 that are not compressed in the first stage of relative rotary displacement but are compressed in a second stage of relative rotary displacement. The torsion angle corresponding to the second stage is larger than a torsion angle corresponding to the first stage. The plates 12 and 13 are arranged on the axial side of the intermediate member 3.

Abstract: A frictional resistance between a spring seat and a retaining plate is suppressed to provide stable damper characteristics. A lockup damper mechanism 2 of a torque converter 1 is operable to transmit a torque from a front cover 3 to a turbine 5 and, at the same time, damp a vibration, and includes a piston 17, a driven plate 20, torsion springs 21, a retaining plate 19, spring seats 32 and balls 30. The torsion springs 21 elastically couples, in a rotating direction, the piston 17 and the driven plate 20 together. The retaining plate 19 restricts radially outward movement of the torsion springs 21. The spring seats 32 supports ends of the torsion springs 21. The balls 30 are contactable with the retaining plate 21, and are disposed between the retaining plate 21 and the spring seat 32.

Abstract: To avoid an increase of the number of steps for assembling a coil spring and seat members and a reduction in mechanical strength of the coil spring or the like, a coil spring assembly 20 is provided with the coil spring 25 and the seat members 26. Each seat member 26 has receivers 27 for contacting both ends of the coil spring 25 and projections 28 extending into the coil spring 25 from the receivers 27. Ribs 29 are formed on an outer circumferential surface of the projections 28 for engagement with the coil spring 25.

Abstract: In a first embodiment, a clutch disc assembly has a retaining plate 5, a hub 2, a first coil spring 6, a second coil spring 7, and a first friction washer 8. A connecting plate 3 is positioned in an outer circumference of the of the hub 2. The first coil spring elastically couples the connecting plate 3 and the hub 2 in a circular direction. The second coil spring 7 elastically couples the retaining plate 5 and the connecting plate 3 in a circular direction and is more excellent in rigidity than the first coil spring 6. The first friction washer 8 includes a first friction member 13 positioned between the retaining plate 5 and the hub 2, a second friction member 14 positioned between the connecting plate 3 and the retaining plate 5, and a coupling element coupling the first and second friction members 13 and 14 and elastically deformable in axial directions.

Abstract: A composite torsional vibration damper which can be utilized with advantage in the clutch disc of a friction clutch in the power train of a motor vehicle has a composite input member which can be driven by the output element of a combustion engine, an output member which is angularly movable with and relative to the input member about a common axis and can transmit torque to the input element of a variable-speed transmission, and first and second dampers which operate in series to oppose different angular movements of the input and output members relative to each other. The first damper is disposed radially inwardly of the second damper and its rigidity is less than that of the second damper. The energy storing elements of the first damper permit an angular movement of the input and output members relative to each other through an angle of at least 20.degree., and the second damper permits such angular movement through an angle of at least 15.degree..

Abstract: A torsional vibration dampening device suitable for a clutch to transmit torque between driving and driven members, absorbing torsional vibrations, comprises a plurality of circumferentially extending spring receiving portions defined in both a torque-input member and a torque-output member, a plurality of damper spring sets operatively accommodated in the respective spring receiving portions, and a floating spring separator being rotatable relatively to both the torque-input member and the torque-output member and having a plurality of tapered arms interposed between adjacent damper springs in each spring set and a connecting member integrally formed with the tapered arms. The connecting member is cylindrical in shape and arcuately and rotatably accommodated in an essentially cylindrical aperture axially circumferentially extending along a cylindrical outer flanged portion of the device. The tapered arms project radially and inwardly from the cylindrical connecting member.

Abstract: A damper between coaxial input and output members in the composite flywheel of a motor vehicle has a pair of elongated arcuate coil springs which alternate with the radially outwardly extending arms of a flange-like component. The arms have first sides which stress the adjacent first end convolutions of the springs during rotation of the two members relative to each other in a first direction (e.g., when the engine drives the wheels), and second sides which stress the adjacent second end convolutions of the springs during rotation of the two members relative to each other in a second direction (e.g., when the vehicle is coasting). At least one side of at least one arm is different from at least one other side; for example, the at least one side can have one or more projections or a recess for the radially outermost part of the adjacent end convolution.

Abstract: A torque vibration absorbing device includes a clutch hub with a flange extending radially, a pair of intermediate plates disposed at both outsides of the flange so as to be rotatable relative to the flange, a disc plate and a sub-plate disposed at the outside of the intermediate plates so as to be rotatable relative to the flange and the intermediate plates, a plurality of connecting pins which connect the disc plate and the sub-plate, and a plurality of elastic members provided in series at the inside of the disc plate and the sub-plate through the intermediate plates, wherein at least one elastic member is maintained at a predetermined amount of compression when a torsional degree between the flange and each of the disc plate and the sub-plate is changed to be larger than the predetermined amount thereof and the other elastic members are continued to be compressed exceeding the predetermined amount of compression.