Abstract: A damper device including an input element and an output element; an elastic body transmitting torque between the input element and the output element; and a rotary inertia mass damper having a mass body. The rotary inertia mass damper includes a sun gear, a carrier rotatably supporting pinion gears, and a ring gear that meshes with the pinion gears and serving as the mass body. A pair of washers is located on both sides of each pinion gear axially. The ring gear includes an annulus gear having internal teeth meshing with the pinion gears and a weight body fixed to the annulus gear such that the weight body is in contact with a side surface of the annulus gear. An inner circumferential surface of the weight body is supported in a radial direction by a tip of the pinion gear or an outer circumferential surface of the washer.

Abstract: A vibration damping apparatus includes a support member configured to rotate together with a rotational element, a restoration force generating member coupled to the support member so as to transmit and receive a torque with the support member, an inertial mass coupled to the support member via the restoration force generating member, a first guide surface provided on the restoration force generating member, a second guide surface provided on the inertial mass, and a coupling member having first and second rolling portions. The first and second guide surfaces are formed so that the first rolling portion rolls along the first guide surface and the second rolling portion rolls along the second guide surface along with rotation of the support member to cause the restoration force generating member to swing relative to a rotation center of the rotational element along a radial direction of the support member and cause the inertial mass to swing about the rotation center.

Abstract: A vibration damping device includes a support member that rotates, together with a rotary element to which torque from an engine is transmitted, about a center of rotation of the rotary element, a restoring force generation member that is coupled to the support member to transmit torque to and receive torque from the support member and that is swingable along with rotation of the support member, and an inertial mass body that is coupled to the support member via the restoring force generation member and that swings about the center of rotation in conjunction with the restoring force generation member along with rotation of the support member. The support member is disposed between at least a part of the restoring force generation member and at least a part of the inertial mass body in an axial direction.

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 damping device includes a supporting member rotatable about a rotation center of a rotating element, a restoring-force generating member coupled to the supporting member, and an inertial mass body coupled to the supporting member via the restoring-force generating member. The restoring-force generating member includes two guidable portions disposed with a clearance therebetween in a circumferential direction of the rotating element, and a torque transmission portion between the two guidable portions to transmit torque to and from the supporting member. The inertial mass body includes multiple guide portions for guiding corresponding guidable portions.

Abstract: In a vibration damping device 20, the moment of inertia J1 of a driven member 15, the moment of inertia J2 of an inertial mass body 23, the mass m of crank members 22, the distance L3 between the center of gravity G of the crank member 22 and the fulcrum of swinging of the crank member 22 with respect to the inertial mass body 23, and the distance L4 between this fulcrum and the center of rotation RC are determined so that torque fluctuation of an object for which vibration is to be damped, which is derived based on angular displacement and angles obtained by solving an equation of motion for the driven member 15 and an equation of motion for the entire vibration damping device 20 is equal to a target value.

Abstract: A vibration damping device including: a support member rotating with a rotary element to which torque from an engine is transferred about the center of rotation of the rotary element; a restoring force generation member coupled to the support member and swingable with rotation of the support member; and an inertial mass body coupled to the support member via the restoring force generation member and swung about the center of rotation in conjunction with the restoring force generation member with rotation of the support member. The order of the vibration damping device is larger than the sum of the excitation order of the engine and an offset value determined in consideration of the effect of oil in the oil chamber. The reference order, which is a convergent value of the order of the vibration damping device, is higher than the excitation order.

Abstract: A damper device includes an input element to which a torque from an engine is transmitted; an intermediate element; an output element; a first elastic body arranged to transmit a torque between the input element and the intermediate element; a second elastic body arranged to transmit a torque between the intermediate element and the output element; a rotary inertia mass damper that includes a mass body rotating in accordance with relative rotation between the input element and the output element and that is arranged between the input element and the output element to be parallel to a torque transmission path including the first elastic body, the intermediate element and the second elastic body; and an attenuation mechanism configured to attenuate resonance of the intermediate element.

Abstract: Provided is a vibration damping device including guide surfaces that are concave surfaces formed in a support member so as to curve toward the outer periphery of the support member; mass bodies that, as the support member rotates, roll on the guide surfaces while being pressed against the guide surfaces by a centrifugal force; and inertia rings that are rotatably coupled to the mass bodies and swing about the center of rotation of the support member. When the vibration damping device is in equilibrium, the center of gravity of each mass body is located radially outward of the joint position between the mass body and the inertia rings. As the support member rotates, the inertia rings swing relative to the support member about the center of rotation of the support member, and the mass bodies roll on the guide surfaces.

Abstract: In a vibration damping device 20, the moment of inertia J1 of a driven member 15, the moment of inertia J2 of an inertial mass body 23, the mass m of crank members 22, the distance L3 between the center of gravity G of the crank member 22 and the fulcrum of swinging of the crank member 22 with respect to the inertial mass body 23, and the distance L4 between this fulcrum and the center of rotation RC are determined so that torque fluctuation of an object for which vibration is to be damped, which is derived based on angular displacement and angles obtained by solving an equation of motion for the driven member 15 and an equation of motion for the entire vibration damping device 20 is equal to a target value.

Abstract: A damper device includes an input element to which a torque from an engine is transmitted; an intermediate element; an output element; a first elastic body that transmits a torque between the input element and the intermediate element; a second elastic body that transmits a torque between the intermediate element and the output element; a rotary inertia mass damper that includes a first mass body rotating in accordance with relative rotation between the input element and the output element and that is arranged between the input element and the output element to be parallel to a torque transmission path including the first elastic body, the intermediate element and the second elastic body; a second mass body; and an elastic body arranged to couple the second mass body with the output element.

Abstract: A rotating inertia mass damper of a damper device comprises a planetary gear including a driven member that has external teeth and that serves as a sun gear; a plurality of pinion gears; first and second input plate members that are configured to support the plurality of pinion gears in a rotatable manner and that serve as a carrier; and a ring gear that is engaged with the plurality of pinion gears and that serves as a mass body. The ring gear has two gear main bodies that are arranged along an axial direction of the planetary gear and that are coupled with each other. Internal teeth of the two gear main bodies are shifted to each other in a circumferential direction of the gear main bodies.

Abstract: A damper device includes first inner springs configured to transmit a torque between a drive member and an intermediate member, second inner springs configured to transmit a torque between the intermediate member and a driven member, and a rotary inertia mass damper including a sun gear serving as a mass body rotating with relative rotation of the drive member to the driven member. The rotary inertia mass damper is provided in parallel to a torque transmission path including the intermediate member, the first inner springs and the second inner springs. A damping ratio ? of the intermediate member determined based on a moment of inertia J2 of the intermediate member and rigidities k1 and k2 of the first and the second inner springs and is less than a value.

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 are rotatably supported by the first oscillator, come into contact with the respective two guide surfaces of the second oscillator pushed outward in the radial direction by centrifugal force generated by rotation of the rotator, and roll along the respective two guide surfaces by oscillation of the first oscillator and are pushed by the respective two guide surfaces in the circumferential direction. The second oscillator is capable of translation in the radial direction with the two guide surfaces supported by the respective two rollers.

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 damping apparatus that includes a plurality of rotational elements including an input to which a torque from an engine is transferred, and an output; a first torsional stiffness mechanism arranged between the input and the output and having a positive torsional stiffness; and a second torsional stiffness mechanism configured to act in parallel to the first torsional stiffness mechanism between the input and the output and having a negative torsional stiffness, wherein the negative torsional stiffness of the second torsional stiffness mechanism increases on a negative side as a rotation speed of the engine increases.

Abstract: A centrifugal pendulum-type vibration absorbing device that includes a support that rotates together with any one of the rotary elements of the damper; and a mass that is supported by the support so as to oscillate freely, wherein the centrifugal pendulum-type vibration absorbing device is designed to have an effective order that is greater by at least a correction amount associated with the hysteresis of the damper than an order of vibration that is generated in the driving device to be damped.

Abstract: A vibration damping device including: a support member rotating with a rotary element to which torque from an engine is transferred about the center of rotation of the rotary element; a restoring force generation member coupled to the support member and swingable with rotation of the support member; and an inertial mass body coupled to the support member via the restoring force generation member and swung about the center of rotation in conjunction with the restoring force generation member with rotation of the support member. The order of the vibration damping device is larger than the sum of the excitation order of the engine and an offset value determined in consideration of the effect of oil in the oil chamber. The reference order, which is a convergent value of the order of the vibration damping device, is higher than the excitation order.

Abstract: A vibration damping device 20 includes: a crank member 22 that is swingable along with rotation of a driven member 15 to which torque from an engine EG is transferred; and an inertial mass body 23 coupled to the driven member 15 via the crank member 22 and swung about a center of rotation RC in conjunction with the crank member 22 along with rotation of the driven member 15. The vibration damping device 20 is designed such that an effective order qeff becomes higher as the amplitude of vibration of input torque transferred from the engine EG to the driven member 15 becomes larger.

Abstract: A centrifugal pendulum vibration absorbing device includes a flange that is coupled to a driven member that is a rotary element that rotates using power from an engine and a mass body that is coupled to the flange so as to oscillate about a pendulum fulcrum PF and is designed so as to have an effective order qeff that is greater by a correction amount ?q that is at least associated with the non-linearity of an order q of vibration of the flange and the mass body that is dependent on an oscillation angle ? of the mass body than an order qtag of vibration that is generated in the engine to be damped.