A vibration damping device including a supporting member rotating with a rotation element around a rotation center of the rotation element; a restoring force generation member coupled to the supporting member to transfer torque to and from the supporting member and configured to swing with rotation of the supporting member; and an inertia mass body coupled to the supporting member via the restoring force generation member and swinging around the rotation center with the restoring force generation member with rotation of the supporting member, in which the restoring force generation member swings around a swing center so that a relative position with respect to the inertia mass body does not change, and a distance between a center of gravity of the restoring force generation member and the swing center changes with a change in a swing angle of the restoring force generation member with respect to the inertia mass body.

A vehicle vibration reducing apparatus includes: an inertial mass body; a first engagement device that is switched between a state where a running power source engages with a damper of a power transmission device so as to enable power transmission and a state where the engagement is released; a second engagement device that is switched between a state where the power transmission device engages with the inertial mass body so as to enable power transmission in a power transmission pass different from that of the first engagement device and a state where the engagement is released; and a third engagement device that is switched between a state where the running power source engages with the inertial mass body so as to enable power transmission in a power transmission path different from those of the first engagement device and the second engagement device and a state where the engagement is released.

A vibration damping device includes: a supporting member that rotates integrally with a rotation element, to which torque from an engine is transmitted, around a rotation center of the rotation element; a restoring force generation member that is coupled to the supporting member so as to transmit and receive torque to and from the supporting member and that is configured to swing in accordance with rotation of the supporting member; and an inertia mass body that is coupled to the supporting member via the restoring force generation member and that swings around the rotation center in conjunction with the restoring force generation member in accordance with rotation of the supporting member, in which the restoring force generation member swings around a swing center that is set so that a relative position with respect to the inertia mass body does not change, and a distance between a center of gravity of the restoring force generation member and the swing center changes in accordance with a change in a swing angle of the restoring force generation member with respect to the inertia mass body.

A torque fluctuation inhibiting device for inhibiting torque fluctuations in a rotor to which a torque is inputted is disclosed. The torque fluctuation inhibiting device comprises a mass body, a plurality of drag mechanisms, and a restriction mechanism. The mass body is disposed to be rotatable with the rotor and to be rotatable relative to the rotor. Each of the plurality of drag mechanisms is for generating a circumferential force when a relative displacement is produced between the rotor and the mass body in a rotational direction. The circumferential force is directed to reduce the relative displacement. The restriction mechanism is for restricting actuation of one or more of the plurality of drag mechanisms.

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.

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.

Circular force generator (CFG) devices, systems, and methods are disclosed having indirectly driven imbalanced rotors for generating vibrations and/or imparting vibration control. A CFG device (10) includes a first set of imbalanced rotors (12) disposed about a center point and a second set of imbalanced rotors (12) disposed about the center point. The first set of imbalanced rotors is configured to co-rotate synchronously. The second set of imbalanced rotors is configured to co-rotate synchronously. The first and second sets of imbalanced rotors are configured to create a controllable rotating force vector having a controllable magnitude and phase about the center point. A CFG system includes a controller and one or more CFG devices configured to receive control commands from the controller. A method of generating a force via a CFG device includes receiving a force command and generating a force in response to receiving the force command.

A torque fluctuation inhibiting device for inhibiting torque fluctuations in a rotor to which a torque is inputted is disclosed. The torque fluctuation inhibiting device comprises a mass body, a plurality of drag mechanisms, and a restriction mechanism. The mass body is disposed to be rotatable with the rotor and to be rotatable relative to the rotor. Each of the plurality of drag mechanisms is for generating a circumferential force when a relative displacement is produced between the rotor and the mass body in a rotational direction. The circumferential force is directed to reduce the relative displacement. The restriction mechanism is for restricting actuation of one or more of the plurality of drag mechanisms.

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.

A torque fluctuation inhibiting device includes a first rotating body, a second rotating body, a centrifugal element, a support portion, and a displacement inhibiting mechanism. Torque is input to the first rotating body. The centrifugal element is subject to centrifugal force due to rotation of the first rotating body and moves in a direction different from a direction in which the centrifugal force acts. The support portion is provided in the first rotating body or the second rotating body and moveably guides the centrifugal element in the direction different from the direction in which the centrifugal force acts on the centrifugal element. The displacement inhibiting mechanism generates circumferential force which reduces a relative displacement of the first rotating body and the second rotating body when the centrifugal element moves in the direction different from the direction in which the centrifugal force acts on the centrifugal element.