A power transmission device is provided, which includes a vibration reducing damper provided on a power transmission path, and a clutch mechanism having a plurality of friction plates, a hydraulic pressure chamber, and a centrifugal balance chamber provided opposed to the hydraulic pressure chamber. The clutch mechanism is provided adjacent to an axial side part of the damper, and an oil drain port for hydraulic fluid supplied to the centrifugal balance chamber of the clutch mechanism is provided at a location radially inward of the damper and axially overlapping with the damper.

The present invention relates to a lubricating oil composition for drive system apparatus having excellent wear resistance and oxidation stability and a method for producing the same, a lubrication method of a drive system apparatus using the foregoing lubricating oil composition, and a drive system apparatus.

A damping apparatus can be self-centering and include one or more pre-compressed and preloaded mechanical springs. A solar tracking apparatus can include a solar panel mounted on a rotating shaft, and a self-centering damping apparatus operatively connected to the rotating shaft to compensate for torque created when the solar panel is rotated at an angle to horizontal. A steering assembly for a zero-turn riding lawn mower can include a pair of steering levers and a self-centering damping apparatus operatively connected to the steering levers.

The invention relates to the field of transport mechanical engineering and concerns friction shock absorbers for vehicles.

The object of the invention is to improve the operational life, performance and reliability of a friction shock absorber.

The friction shock absorber comprises housing (1) with bottom (2) and with orifice (3) formed by walls (4), internal surfaces (fv) whereof form alternating working beds (V1) and connecting beds (V2), and further comprises friction assembly (5) consisting of pressure wedge (6) and stay wedges (7) in contact with same, said stay wedges being provided with friction surfaces (fp), while return-and-retaining device (8) is located between bottom (2) and friction assembly (5). In addition, the area (S1) of contact between friction surfaces (fp) of stay wedges (7) and internal surfaces (fv) of walls (4) of orifice (3) in working beds (V1) exceeds the corresponding area (S2) of contact in the connecting beds (V2).

The internal surfaces (fv) may be straight, while the values of angles (θ1) between adjacent internal surfaces (fv), which form working beds (V1), are lower than the values of angles (θ2) between adjacent internal surfaces (fv), which form the connecting beds (V2).

The thickness of walls (4) of the orifice (3) is variable with an increase in the direction from the working bed (V1) to the connecting bed (V2).

The contact between pressure wedge (6) and stay wedges (7) is provided along linked curved surfaces (fκ).

Provided is a torque damper device capable of setting high hysteresis in a wide range and improving assembling property and maintainability of a high friction material for generating the high hysteresis. A torque damper device 100 includes an output hub 104 and a flange 107 between a first input plate 101 and a second input plate 102 rotatably driven by a rotational driving force of an engine. The output hub 104 is formed in a cylindrical shape. The flange 107 is attached to a portion that projects radially outward of the output hub 104. Further, the output hub 104 is formed with a friction plate holder 106 on an outer peripheral surface thereof. The friction plate holder 106 is fitted to a plate-side fitting portion 111a of a first friction plate 111, and is formed to have an axial length longer than a total thickness of the first friction plate 111 and a first intermediate plate 112.

A vibration damper may include a damper tube and a damper piston disposed in the damper tube so as to be reciprocatingly movable. The damper tube may be connected to a piston rod extending out of the damper tube, and the damper piston may movably separate a first oil-filled damper chamber on a piston rod side from a second oil-filled damper chamber remote from the piston rod. A bottom element at one end of the damper tube seals the end of the damper tube. The bottom element may protrude into the end of the damper tube and thereby reduce oil volume of the second damper chamber.

A power transmission device is provided, which includes a vibration reducing damper provided on a power transmission path, and a clutch mechanism having a plurality of friction plates, a hydraulic pressure chamber, and a centrifugal balance chamber provided opposed to the hydraulic pressure chamber. The clutch mechanism is provided adjacent to an axial side part of the damper, and an oil drain port for hydraulic fluid supplied to the centrifugal balance chamber of the clutch mechanism is provided at a location radially inward of the damper and axially overlapping with the damper.

A centrifugal pendulum damper in which a rolling mass can be lubricated by a simple structure without limiting vibration damping performance. The pendulum damper comprises: a rotary member; an inertia body arranged concentrically with the rotary member; a rolling mass held in a retainer on an outer circumference of the rotary member; a recess formed on an inner circumference of the inertia body; and a raceway surface formed on an inner circumference of the recess to which the rolling mass is contacted. In the centrifugal pendulum damper, oil remaining in the recess is discharged out of the recess through an oil passage.

A bearing bush for supporting a motor vehicle part includes an inner tube made of a metal, a sliding sleeve made of a first plastic material and mounted rotatably on the inner tube, and an elastomer bearing which surrounds the sliding sleeve and has at least a first elastomer body and an outer sleeve. A sliding layer made of a second plastic material is applied to an outer circumferential surface of the inner tube, the first plastic material and the second plastic material forming a tribological pairing either of two different polymers from the groups of polyamides, polyoxymethylenes, polyketones, fluoropolymers, polyethylene terephthalates or polybutylene terephthalates, or the tribological pairing being formed from polyketone against polyketone, wherein the polymers of the tribological pairings each are present in a continuous thermoplastic polymer phase.

A vibration damping device of an inverted structure includes a cylinder, a rod capable of protruding and retracting in the cylinder, an outer cylinder coupled to the rod and inserted over the outer periphery of the cylinder, and a bush slidably inserted between the outer cylinder and the cylinder. A gap between the outer cylinder and the cylinder is filled with lubricating oil. The bush contains polytetrafluoroethylene and perfluoro alkoxy alkane. The lubricating oil contains an organic molybdenum additive.