A drive arrangement having an internal combustion engine, a transmission device with a power input and a power output, having an electric motor or converter which comprises a rotor, for the output of a drive torque to the power input of the transmission device is provided. An absorber arrangement is provided for rotation about a central axis for the reduction of the degree of irregularity of the rotational drive movement of the internal combustion engine, which rotational drive movement is introduced into the transmission device at the power input thereof. The absorber arrangement comprises a first carrier part, a second carrier part, a plurality of absorber masses which follow one another in the circumferential direction, and a coupling mechanism, for the movement of the absorber masses in a radial plane with respect to the central axis in accordance with a relative rotation of the carrier parts with respect to one another.

A torsional vibration damper that a torsional vibration damper having a planetary gear unit, and a manufacturing method of the torsional vibration damper for limiting damages on gears of the planetary gear unit due to dimension errors. In the planetary gear unit, at least one of a sun gear, a ring gear, and a set of planetary gears is/are formed by a press forming method. The gear formed by the press forming method is engaged with the remaining gears in such a manner that a thinner portion of each tooth is individually engaged with a thicker portion of the adjacent teeth of the remaining gears.

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 torque fluctuation inhibiting device configured to inhibit torque fluctuations is disclosed. The torque fluctuation inhibiting device comprises a first rotor, a second rotor disposed to be rotatable relative to the first rotor, a centrifugal element, and a cam mechanism. The centrifugal element is configured to receive a centrifugal force generated by rotation of the first rotor. The centrifugal element is disposed to be movable with respect to the first rotor. The centrifugal element includes an engaging portion configured to be engage with the first rotor. The centrifugal element is formed by a plurality of components. The cam mechanism is configured to generate a circumferential force in movement of the centrifugal element and the circumferential force reduces relative displacement between the first rotor and the second rotor.

A power transmission apparatus with a centrifugal pendulum damper is realized, which can effectively suppress torque fluctuation and vibration noise of a vehicle while avoiding size increase of a centrifugal pendulum damper and deterioration of reliability of the centrifugal pendulum damper by high-speed rotation. A power transmission apparatus with a centrifugal pendulum damper includes: a centrifugal pendulum damper coupled to an input shaft through a speed-increasing mechanism configured to increase speed of rotation of the input shaft; and an engagement/disengagement mechanism capable of realizing and cutting off power transmission from the input shaft to the centrifugal pendulum damper.

A damper device according to the present invention includes an input shaft member to which a driving force from a crankshaft of an internal combustion engine is input, an output shaft member capable of outputting the driving force transmitted from the input shaft member, an input side cam and an output side cam respectively connected to the input shaft member and the output shaft member, and a damper bearing pivotable on the input side cam or the output side cam, wherein a damper bearing assembly has a bearing shaft supporting a plurality of damper bearings, bearing axes of the plurality of damper bearings are arranged along a bearing shaft axis of the bearing shaft, the bearing shaft is orthogonal to a rotation axis, and a shaft support portion supporting the bearing shaft, is provided between the adjacent damper bearings of the damper bearing assembly.

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 damping device for damping vibrations of a motor vehicle transmission drivetrain. The damping device features a first element and a second element (2) rotationally movable around a rotation axis X, an elastic damping member having an elastic blade (13, 14) mounted rotationally integrally with the first element (3) and a rolling body movable with respect to the second element along a curvilinear trajectory over at least a predetermined angular sector (A). Movement of the rolling body along the curvilinear trajectory with respect to the second element is accompanied by a movement of the rolling body on the elastic blade, causing the elastic blade to flex.

An internal combustion engine assembly has a crankcase, a cylinder block connected to the crankcase, the cylinder block defining at least one cylinder, at least one piston disposed in the at least one cylinder, a crankshaft disposed at least in part in the crankcase and operatively connected to the at least one piston, and a flywheel operatively connected to and driven by the crankshaft. The crankshaft rotates in a first direction about a crankshaft axis. The flywheel rotates in a second direction opposite the first direction about the flywheel axis. A clutch selectively operatively connects the crankshaft to the flywheel. A marine outboard engine having the internal combustion engine assembly is also disclosed.

A number of variations may include a torsional vibration damper having an input side, having an output side and having an energy store for the rotationally elastic coupling of the input and output sides in a circumferential direction, wherein, on the input or output side, there is arranged a mass part that is rotatable relative to the input or output side counter to the restoring force of a restoring apparatus.