A torsional vibration damper in which a noise resulting from collision of an inertia body against a rotary member is reduced. An inertia body is arranged coaxially with the rotary member, and rolling members are interposed between the rotary member and the inertial body to transmit torque of the rotary member to the inertia body. A first clearance between an outer circumference of a rotary member and an inner circumference of the inertia body created when rolling members are centrifugally pushed onto raceway surfaces is identical to or narrower than a second clearance between one of the rolling members situated at a highest level and a bottom surface of a guide section.

A torsional vibration damper in which collision noise resulting from collision of a rolling member against a rotary member is reduced. The torsional vibration damper comprises a restriction mechanism that establishes a restriction force in a direction to restrict the relative rotation between the rotary member and the inertia body, when the rolling member centrifugally pushed onto a raceway surface is pushed radially inwardly by the raceway surface toward a radially inner limit position of a guide section.

Vibration isolators can be dimensioned for securement between a rotational motion source and a rotational motion target. The vibration isolators can include a first end member and a second end member supported in substantially-fixed axial position but axially-rotatable relative to the first end member. An intermediate member can be disposed between and operatively engaging the first and second end members. A rotational motion-to-axial motion conversion system is operatively disposed between the intermediate member and the first end member such that rotation of the intermediate member and the second end member generates axial displacement of the intermediate member relative to the first and second end members. A biasing element can be operatively disposed between the intermediate member and one or more of the first and second end members to bias the intermediate member in an axial direction. Rotary power transmissions or system are also included.

A torsional vibration damper includes a rotary member rotated by torque, an inertia body rotated relatively on an outer radial side of the rotary member due to torque pulse, and a rolling member coupled to the rotary member and the inertia body. The rotary member includes support sections that are provided on its outer radial side, and by which the rolling member is restricted in a rotating direction of the rotary member and is engaged movably in a radial direction of the rotary member. The inertia body includes: a pair of mass sections respectively projecting toward both sides in an axial direction; and a pair of raceway surfaces on which the rolling member rolls. A center of curvature of each raceway surface is deviated from a rotational center of the rotary member.

A hybrid module for a powertrain of a motor vehicle includes a rotational axis defining an axial direction, a housing, first and second support bearings, an intermediate shaft, a separating clutch, and a sensor device. The second support bearing is arranged at a distance from the first support bearing in the axial direction to form a receiving space therebetween. The intermediate shaft is mounted by the first support bearing and the second support bearing to be rotatable relative to the housing about the rotational axis. The separating clutch has a rotary component arranged to be coupled to an electric machine, and connected for conjoint rotation with the intermediate shaft. The sensor device includes at least one part arranged in the receiving space.

An arrangement reduces oscillation of an oscillatory structure. The arrangement has: a structure having at least one mode in at least one direction; and an oscillation-reducing device. The oscillation-reducing device includes a housing on the structure; a cavity; and a body. The body is configured to make impact contact with a first surface portion and a second surface portion of an inner wall of the housing and disposed is in the cavity such that the body can make impact contact with the first surface portion and the second surface portion of the inner wall of the housing at least temporarily for as long as the structure is excited in the at least one mode in the at least one direction. The first surface portion or the second surface portion of the inner wall of the housing has a curved profile.

A damper device of a starting device includes a drive member, a driven member, outer springs that transmit torque between the drive member and the driven member, first and second inner springs that are placed inward of the outer springs and that transmit torque between the drive member and the driven member, and a dynamic damper having third springs coupled to a first intermediate member as a rotary element and a turbine runner as a mass body coupled to the third springs. The third springs of the dynamic damper are disposed so as to be located next to the outer springs of the damper device in the circumferential direction.

1. A dynamic damper comprising: a resilient material having a central bore formed therethrough dimensioned to receive a vehicle axle, the central bore defining a first inner diameter; an annular mass surrounded and embedded in the resilient material, the annular mass defining a second inner diameter greater than the first inner diameter; and a metallic split ring embedded within the resilient material along a portion of the surface of the central bore with locking protrusions extending into the central bore, ends of the locking protrusions defining a third inner diameter smaller than the first inner diameter, the locking protrusions being dimensioned to extend into openings in the vehicle axle locking the metallic split ring, the resilient ring and the annular mass to the vehicle axle.

A pump system may include a pump, a driveshaft, driving equipment, and a vibration dampening assembly configured to reduce pump-imposed high frequency/low amplitude and low frequency/high amplitude torsional vibrations. The pump may have an input shaft connected to the driveshaft. The driving equipment may include an output shaft having an output flange connected to the driveshaft. The driving equipment may be configured to rotate the driveshaft to rotate the input shaft of the pump therewith. The vibration dampening assembly may include one or more flywheels operably connected to the input shaft and configured to rotate therewith.

An image forming apparatus includes: a plurality of stations and a plurality of stays arranged along a first direction; and a first board support member supporting a first electric board. Each of the plurality of stations includes: a rotation shaft extending in a second direction intersecting the first direction; and a photosensitive member and a flywheel provided to the rotation shaft. The first board support member is attached to two of the plurality of stays so as to bridge a gap between the two stays, and provided, in the second direction, on a first side opposite to a second side of the flywheel on which the photosensitive member is provided. The first board support member overlaps with the flywheel of at least one of the plurality of stations when viewed from a viewpoint along the second direction.