An integrated gear and torsional vibration damper assembly (10, 20, 30, 30) includes a gear (11, 21, 31, 41) having a toothed portion (11a, 21a, 31a, 41a) and a torsional vibration damper (12, 22, 32, 42) supported on the gear (11, 21, 31, 41) for limited rotational and dampened movement relative to each other. The gear (11) may include a hub portion (11b), and the torsional vibration damper (12) may be supported on the hub portion (11b) of the gear (11). Alternatively, the gear (21) may include a hub portion (21b), an intermediate ring (23) may be supported on the hub portion (21b) of the gear (21), and the torsional vibration damper (22) may be supported on the intermediate ring (23). Alternatively, the gear (31) may include a toothed portion (31a) and a hub portion (31b) that extends radially inwardly from the toothed portion (31a) and has an opening (31c) extending therethrough, and the torsional vibration damper (32) may extend through the opening (31c). Alternatively, the gear (41) may include an inner circumferential surface that engages and supports an outer circumferential surface of the torsional vibration damper (41).

A torsional vibration damper, including: a hub supported for rotation around an axis of rotation; a first damper stage including a first damper flange non-rotatably connected to the hub and a first spring engaged with the first damper flange; a second damper stage including a second damper flange and a second spring, radially off-set from the first spring, and engaged with the second damper flange; and a friction control plate non-rotatably connected to the hub, free of contact with the first spring and free of contact with the second spring, and directly engaged with the second damper stage.

In an aspect, a torsional vibration damper is provided, comprising a hub portion that mounts to a crankshaft, an outer ring that includes an inertial mass, a plurality of radial connectors that are elastically deformable and a plurality of spacers that extend circumferentially between the radial connectors and which are elastically deformable by the radial connectors during flexure thereof. The spacers are non-metallic and dissipate energy from deformation via conversion to heat. The plurality of radial connectors have a circumferential spring rate K1a in bending in a circumferential direction about the axis, and have an axial spring rate K1b in bending in an axial direction, wherein K1b is at least 10 times as large as K1a. The plurality of spacers have a circumferential spring rate Kra in the circumferential direction, and an axial spring rate Krb in bending in the axial direction, wherein Kra is less than 1% of K1a.

A torque fluctuation inhibiting device is disclosed. The torque fluctuation inhibiting device includes an input member, a pair of inertia rings and an inertia block. The input member, to which a torque is inputted, is disposed to be rotatable. The pair of inertia rings is disposed axially on the both sides of the input member. The pair of inertia rings is disposed to be rotatable relative to the input member. The pair of inertia rings is unitarily rotated with each other. The inertia block is disposed between the pair of inertia rings. The inertia block is attached to the pair of inertia rings.

A torsion damper disposed inside a coil spring is disclosed. The torsion damper includes a body and a groove. The body is made of resin. Besides, the body has a columnar shape. The groove is provided on the outer peripheral surface of the body.

A vibration absorber for absorbing a vibration of a vibrating component is provided and includes: a spring system and an absorber mass arranged on the spring system. The spring system includes: a first spring element with a first core, and a second spring element with a second core. The first spring element is arranged on the second spring element such that the second core borders the first core, and the vibration absorber can be fastened using a fixing element to the vibrating component in which the vibration is to be absorbed. Furthermore, a method of producing the vibration absorber is further provided.

A hydraulic power transmission device includes a front cover, a torque converter main body, a lock-up device, and a dynamic damper. The dynamic damper has a base plate, inertia rings and lid members that configure an inertial body, viscosity attenuation portions, and an elastic coupling portion. The base plate is fixed to an output plate. The inertial body can move in the rotation direction relative to the base plate. The viscosity attenuation portions can generate a variable hysteresis torque according to the relative speed difference between the base plate and the inertial body.

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.

A torque fluctuation inhibiting device is disclosed. The torque fluctuation inhibiting device includes an input member, a pair of inertia rings and an inertia block. The input member, to which a torque is inputted, is disposed to be rotatable. The pair of inertia rings is disposed axially on the both sides of the input member. The pair of inertia rings is disposed to be rotatable relative to the input member. The pair of inertia rings is unitarily rotated with each other. The inertia block is disposed between the pair of inertia rings. The inertia block is attached to the pair of inertia rings.

A tool body includes a damping apparatus for damping vibrations in a machining tool having, besides the tool body, a member with at least one cutting edge to be secured to the tool body. The damping apparatus is arranged in an internal room of the tool body and includes a damper mass body with an axial bore and a central tube extending through the bore and which is rigidly secured to the damper mass body inside the through bore. A central tube is also at both ends thereof rigidly connected to a tool body fixed part and the central tube is made of a material with a spring property allowing the damper mass body to oscillate in the internal room perpendicularly to the longitudinal extension of the central tube.