Abstract: A flow channel structure forms a first flow channel which makes a first fluid chamber and a second fluid chamber communicate with each other therethrough. The flow channel structure includes first to third plates. The first plate includes a first through hole penetrating the first plate in a thickness direction to open to the first fluid chamber. The second plate includes a second through hole penetrating the second plate in the thickness direction to open to the second fluid chamber. The third plate includes a first connecting through hole penetrating the third plate in the thickness direction. The first connecting through hole is larger in flow channel area than each of the first and second through holes. The first and second through holes are disposed in different positions from each other as seen in the thickness direction. The first connecting through hole communicates with the first and second through holes.

Abstract: A torque limiter embedded damper device includes a torque limiter unit and a damper unit. The damper unit includes a first rotor, a second rotor, and a stopper mechanism. The second rotor includes a flange axially opposed to the first rotor. The stopper mechanism restricts an angle of relative rotation between the first rotor and the second rotor to a predetermined angular range. The stopper mechanism includes a cutout and a stop pin. The cutout is provided in the flange of the second rotor. The stop pin is fixed to the first rotor. The torque limiter unit includes a friction plate having an annular shape. The annular friction plate is fixed at an inner peripheral part thereof to an outer peripheral part of first rotor or the second rotor by a fixation member. The fixation member is fastened in a state of penetrating the cutout of the flange.

Abstract: A torque fluctuation inhibiting device is disclosed. The torque fluctuation inhibiting device includes an input member, an elastic member, a mass body and a centrifugal element. The input member includes a pair of input plates disposed in axial alignment. The input member is disposed to be rotatable. The elastic member is held by the pair of input plates. The mass body is disposed to be rotated with the input member and be rotatable relative to the input member. The centrifugal element is disposed to be radially movable by a centrifugal force acting thereon in rotation of the input member. The centrifugal element is disposed between the pair of input plates.

Abstract: A damper device includes first and second rotors, a first pre-damper, and a first main elastic member. The second rotor includes a hub and a flange. The first pre-damper elastically couples the hub and the flange in a rotational direction, and is actuated in a first range of torsion angle between the first and second rotors. The first main elastic member elastically couples the first and second rotors in the rotational direction, and is actuated in a greater second range of torsion angle. The first pre-damper includes first and second subordinate elastic members. The first subordinate elastic member is compressed in a neutral state, and urges the flange to a first side in the rotational direction with respect to the hub. The second subordinate elastic member is compressed in the neutral state, and urges the flange to a second side in the rotational direction with respect to the hub.

Abstract: A power transmission device includes a flywheel and a damper device. The flywheel includes a plurality of fixation holes. The damper device includes an input rotary member, an output rotary member, and a pair of first elastic members. The input rotary member and output rotary member each include a plurality of assembling holes disposed in corresponding positions to the plurality of fixation holes of the flywheel. The plurality of assembling holes are arranged in a circumferential direction such that two pairs of the assembling holes, each pair including two adjacent assembling holes, are each disposed at a larger interval than remaining assembling holes to produce a pair of accommodation spaces. A pair of first accommodation portions, accommodating the pair of first elastic members, is disposed radially outside the pair of accommodation spaces.

Abstract: A drive unit for driving a drive wheel is disclosed. The drive unit includes a motor, a torque converter and a power output part. The torque converter is a component to which a power is inputted from the motor. The power output part outputs the power, inputted thereto from the torque converter, to the drive wheel. The power output part includes a first gear train and a second gear train. The first gear train outputs the power, inputted to the power output part from the torque converter, in a first rotational direction. The second gear train outputs the power, inputted to the power output part from the torque converter, in a second rotational direction reverse to the first rotational direction.

Abstract: A torque fluctuation inhibiting device includes a mass body, a centrifugal element and a cam mechanism. The mass body is disposed in alignment with a rotor in an axial direction, and is rotatable relatively to the rotor. The cam mechanism includes a cam and a cam follower. When relative displacement occurs between the rotor and the mass body due to a centrifugal force that acts on the centrifugal element, the cam mechanism converts the centrifugal force into a circumferential force directed to reduce the relative displacement. Guide parts are provided on both ends of the centrifugal element. Each guide part makes contact with a member adjacent thereto in an opposite position to a contact point between the cam and the cam follower through a center of gravity of the centrifugal element when the relative displacement occurs between the rotor and the mass body in the rotational direction.

Abstract: A damper device is provided with a first rotating body, a second rotating body, a coil spring and a spring seat. The coil spring is interposed in a circumferential direction between the first and second rotating bodies. The resin spring seat includes a seat portion, an overhang portion and a pair of clamping protrusions. The overhang portion extends in the circumferential direction from an outer diameter end of the seat portion and covers an outer diameter side of the coil spring. The clamping protrusions protrude from the seat portion and sandwich an attaching portion of the one of the rotating bodies. The clamping protrusions are relatively turnable in a radial direction of the rotating bodies. The clamping protrusions have a low-rigidity portion on an outer diameter direction side of the spring central axis and a high-rigidity portion on an inner diameter direction side of the spring central axis.

Abstract: A damper disc assembly includes first and second input plates, an output unit, a high stiffness damper unit, and first and second low stiffness damper units. The output unit includes an input-side member and an output-side member disposed rotatably relative to each other. The high stiffness damper unit elastically couples the input-side member and the first and second input plates in a rotational direction and is actuated in a high torsion angular range of torsional characteristics. The first and second low stiffness damper units elastically couple the input-side member and the output-side member and are actuated in a low torsion angular range of the torsional characteristics. The second low stiffness damper unit is actuated later than actuation of the first low stiffness damper unit.

Abstract: A damper device is provided with a first rotating body, a second rotating body, a coil spring and a spring seat. The coil spring is interposed in a circumferential direction between the first and second rotating bodies. The resin spring seat includes a metallic core member inside. The resin spring seat has a seat portion and an overhang portion. The metallic core member has includes a metallic core seat part with a metallic core exposed portion. The metallic core seat part is provided along the spring seating surface in the seat portion of the spring seats. The metallic core exposed portion is exposed so as to be capable of abutting the coil springs. The metallic core exposed portion is provided on a portion of the spring seating surface which slides against the coil springs.

Abstract: A damper device is provided with a first rotating body, a second rotating body, a coil spring and a spring seat. The coil spring is interposed in a circumferential direction between the first and second rotating bodies. The resin spring seat includes a metallic core member inside. The resin spring seat has a seat portion and an overhang portion. The metallic core member has an overhang metallic core part that has a low-rigidity portion and a high-rigidity portion. The low-rigidity portion is provided on a side close to the seat portion with a relatively lower rigidity. The high-rigidity portion is provided on a side far from the seat portion with a relatively higher rigidity.

Abstract: Disclosed is a torque converter (1) which comprises: a casing (10) coupled to an output shaft of an engine; a torus (T) defined by a pump (20), a turbine (30) and a stator (40) each disposed within the casing (10); a lockup clutch (60) adapted to directly couple the turbine (30) and the casing (10); and a lockup damper (70) adapted to absorb shock during engagement of the lockup clutch (60). The turbine (30) has an outer peripheral portion (31a) bulging toward the engine to define a part of the torus (T), an inner peripheral portion (31c) located on the side of the engine with respect to a one-way clutch (50) supporting the stator (40), and an intermediate portion (31b) formed to be concaved toward a side opposite to the engine, in a radial position between the outer peripheral portion (31a) and the inner peripheral portion (31c). A part (75) of the lockup damper (70) is disposed on the side of the engine with respect to the intermediate portion (31b) and in a position axially overlapping with the torus (T).

Abstract: A lock-up device includes a clutch part, an input plate, an output plate, torsion springs and an input plate support member. The clutch part is disposed between a front cover and a turbine, and is configured to allow or block transmission of a torque. The input plate is coupled to a clutch output member of the clutch part. The output plate is fixed to a turbine shell. The torsion springs are disposed between the input plate and the output plate, and absorb and attenuate a torsional vibration. The input plate support member is fixed to a front cover side of a turbine shell and positions the input plate in a radial direction and an axial direction.

Abstract: The torque limiter includes a flywheel, a clutch plate, a spline hub, a clutch disc assembly and a transmission torque limiting part. The flywheel includes a friction coupling surface. The clutch plate includes plural axial through holes. Plural friction members are respectively attached to the through holes. The spline hub can be engaged with a transmission-side shaft. The clutch disc assembly circumferentially elastically couples the clutch plate and the spline hub. The transmission torque limiting part limits torque to be transmitted from the flywheel to the transmission-side shaft while the friction members are interposed and held between the transmission torque limiting part and the friction coupling surface of the flywheel.

Abstract: A damper mechanism 4 has an input rotary member 2, a hub flange 6, a large coil spring 8 and a friction generating mechanism 5. In a state in which the input rotary member 2 is twisted to one side in the rotational direction with respect to the hub flange 6, the friction member is pressed in the rotational direction against the hub flange 6 in a state in which at least part of the friction member has been elastically deformed in the relational direction, so that the friction member and the hub flange 6 function as an integral member in the rotational direction. In a state in which the input rotary member 2 is twisted to one side in the rotational direction with respect to the hub flange 6, the friction member is capable of relative rotation with respect to the hub flange.

Abstract: Second spring seats 62 each have a first support component 63, a second support component 64, and a reinforcing plate 66. The first support component 63 supports the ends of second coil spring 61a in the rotational direction. The second support component 64 extends in the rotational direction from the first support component 63 and supports the end of the second spring 61a in the radial direction. At least part of the reinforcing plate 66 is embedded in at least one of the first and second support components 63 and 64. The reinforcing plate 66 directly or indirectly supports the end of the second spring 61a along with the first and second support components 63 and 64.

Abstract: Second spring seats 62 each have a first support component 63, a second support component 64, and a pair of reinforcing components 65. The first support components 63 support the ends of second coil springs 61a in the rotational direction. The second support components 64 extend in the rotational direction from the first support components 63, and support the ends of the second coil springs 61a in the radial direction. The reinforcing components 65 link the first support components 63 and the second support components 64, and extend in the radial direction from the second support components 64.

Abstract: A manufacturing method that can stabilize an operation torque of a torque limiter device in a manufacturing stage is provided. The method of manufacturing the torque limiter device 1 includes an assembling step S1 of attaching a clutch disk 13 and a damper mechanism 16 to a spline hub 15, and attaching a friction facing 21 to the clutch disk 13; an assembling step S2 of attaching a transmission torque limiting portion 6 to the friction facing 21; and a grinding step S4 of supplying a torque to at least one of the transmission torque limiting portion 6 and the spline hub 15 to rotate them relatively to each other.

Abstract: A damper mechanism (4) includes a first flywheel (2), an intermediate rotating body (44) arranged to be rotatable with respect to the first flywheel (2), a second flywheel (3) arranged to be rotatable with respect to the intermediate rotating body (44), a first damper (8) having a plurality of first coil springs (41) elastically coupling the first flywheel (2) and the intermediate rotating body (44) in a rotation direction, and a second damper (9) elastically coupling the intermediate rotating body (44) and the second flywheel (3) in the rotation direction and that begins operating at a torque that is lower than the minimum operating torque of the first damper (8). The first coil springs (41) are accommodated between the first flywheel (2) and the second flywheel (3) in a state of having been compressed in the rotation direction.

Abstract: There is provided a lock-up damper that affords greater design latitude. A lock-up damper 7 comprises a pair of input rotors 71 that rotate integrally, an intermediate plate 73, a turbine hub 43, an output rotor 72, a plurality of first springs 74, and a plurality of second springs 75. The turbine hub 43 is disposed so as to be capable of rotating within a specific angle range with respect to the intermediate plate 73, and is able to come into contact in the rotational direction with the intermediate plate 73. A pair of the output rotors 72 are disposed to the inside in the radial direction of the pair of input rotors 71, and are fixed to the turbine hub 43.