Abstract: A damper device includes first and second rotary members, elastic members, and seat members. The first rotary member includes an annular chamber, and first engaging portions provided in the annular chamber. The second rotary member includes a second engaging portion. The elastic members are aligned in a circumferential direction in the annular chamber, and elastically couple the first and second rotary members in a rotational direction. Each seat member is disposed between a circumferential end surface of each elastic member and both the first engaging portions and the second engaging portion. Each seat member includes first and second contact surfaces. The first contact surface contacts the circumferential end surface of each elastic member. The second contact surface contacts the second engaging portion. The first and second contact surfaces tilt at angles to prevent a radially outward force from acting on each seat member when each elastic member is elastically deformed.

Abstract: A centrifugal pendulum damper in which a rolling mass can be lubricated by a simple structure without limiting vibration damping performance. The pendulum damper comprises: a rotary member; an inertia body arranged concentrically with the rotary member; a rolling mass held in a retainer on an outer circumference of the rotary member; a recess formed on an inner circumference of the inertia body; and a raceway surface formed on an inner circumference of the recess to which the rolling mass is contacted. In the centrifugal pendulum damper, oil remaining in the recess is discharged out of the recess through an oil passage.

Abstract: According to one embodiment, a damper device includes a rotator, a first oscillator, a second oscillator, and two rollers, for example. The rotator is provided with a first opening. The second oscillator includes two guide surfaces recessed in a direction closer to a first center of rotation and a transmitting part capable of moving along the first opening. The two rollers each include a ring supported by the first oscillator and a shaft extending along a second center of rotation inside the ring and rotatably supported by the ring. The shaft comes into contact with a corresponding one of the two guide surfaces of the second oscillator pushed outward in the radial direction by centrifugal force, rolls along the corresponding one of the two guide surfaces by oscillation of the first oscillator, and is pushed by the corresponding one of the two guide surfaces in the circumferential direction.

Abstract: A vibration absorber is provided which is mounted in an annular space housing a spring of a damper, wherein accompanying rotational fluctuation of a drive source, when a first plate connected to the drive source and a second plate connected to a transmission rotate relative to each other while elastically deforming a spring, an arm part extending radially outward from a driven plate swings in the interior of an annular space, and grease packed in the annular space is compressed by the arm part and pushed inward in the radial direction, but since this grease is guided in the peripheral direction by a flow-aligning projection provided on either one of the driven plate and the seal plate and projecting toward the other, and is prevented from being concentrated in part of a seal member provided on the inner peripheral part of the seal plate and sealing the annular space.

Abstract: A rotary vibration reduction device for a motor vehicle for transmitting drive power from a drive machine to a drivetrain is provided. The vibration reduction device includes a primary and secondary connectors between the drive machine and drivetrain, and a coupling device between the primary connector and the secondary connector. The coupling device has a vibration reduction actuator with a piston chamber and has a piston element movable to generate a vibration reduction force in response to changes in working pressure in the piston chamber controlled by a pressure-generating device.

Abstract: A damper device includes a first rotary member, a second rotary member, a plurality of coil springs, an intermediate member and a positioning structure. The first rotary member is a member into which a power of an engine is inputted. The second rotary member is disposed to be rotatable with respect to the first rotary member. The plurality of coil springs are configured to be compressed between the first rotary member and the second rotary member. The intermediate member is engaged with the plurality of coil springs and couples the plurality of coil springs together. The positioning structure radially positions the intermediate member with respect to at least either of the first rotary member and the second rotary member on an inner peripheral side.

Abstract: A vibration damper includes a rigid base with a mass coupled thereto for linear movement thereon. Springs coupled to the mass compress in response to the linear movement along either of two opposing directions. A converter coupled to the mass converts the linear movement to a corresponding rotational movement. A rotary damper coupled to the converter damps the rotational movement.

Abstract: A dynamic damper device includes a variable inertial mass device that variably controls inertial mass of a damper mass, an elastic body that connects a rotary shaft rotated by power transmitted thereto and an input member of the variable inertial mass device, and a variable damping force device that variably controls a damping force to the elastic body. Accordingly, the dynamic damper devices have the advantageous effect that vibrations can be appropriately reduced.

Abstract: A method controls a friction clutch disposed between an internal combustion engine and a change speed transmission. The friction clutch is controlled in such a way that it transmits an average coupling torque of the internal combustion engine and does not transmit periodically occurring peak values of the coupling torque. In addition, a control unit is programmed to carry out the method.

Abstract: An internal combustion engine comprises includes a turbo-compound and the known Föttinger-coupling is replaced by a torsion vibration damper. The Föttinger-coupling, which is used to transmit power, has high losses in power when it is necessary to have a differential rotational speed between the input side and the output side, that is, the appearance of a slip. The losses are not used in a torsion vibration damper which has at least the same quality as a Föttinger-coupling.

Abstract: An airtight damper, an input axis, and a flywheel are mounted to the input axis with a bolt. A torque transmitter, a torque transmitter attachment unit of the flywheel, and a support plate are united with each other using a bolt. The torque transmitter includes a spline unit. A pressure plate engaged with the spline unit is pressed by a pressure spring so as to press a friction plate and a torque transmitter plate against the support plate. Since the torque transmitter plate is fixed to a drive plate by a rivet, the torque from the input axis can be transmitted to the drive plate. Although the torque from the engine is larger than an allowable value, a friction member can slip at a constant torque depending on the pressure of the pressure spring, thereby protecting the damper against an excess load.

Abstract: A torsional vibration damper includes a drive-side transmission element connected to a drive and a takeoff-side transmission element, which can deflect rotationally with respect to the drive-side element. A damping device is installed between the two transmission elements and transmits torque between the drive-side transmission element and the takeoff-side transmission element. The damping device has a gas spring system with a reservoir containing a gaseous medium. The reservoir of the gas spring system is connected to a pressure circuit which allows, at least when there is a change in the torque to be transmitted by the gas spring system, adjustment of pressure in the reservoir to adapt the characteristic of the gas spring system to a new torque.

Abstract: A dual-mass flywheel including a primary mass that can be connected to the drive shaft of an internal combustion engine, and a secondary mass that can be connected to the input shaft of a transmission. The masses are positioned in an axial manner in relation to each other, and concentrically by means of at least one positioning device. The masses can be rotated at least in a defining manner counter to the effects of a damping device including energy accumulators. The energy accumulators are arranged in an annular, ring-like chamber that is formed by components of the primary mass and that also contains a viscous medium.