Abstract: A power transmission device includes: an axle housing having a central hole where a drive shaft is penetrated; a wheel hub disposed in an outer portion of the axle housing via wheel bearings; a speed-reducer housing chamber provided in the wheel hub to cover an opening end portion of the axle housing; a gear speed reducer, formed inside the speed-reducer housing chamber, to decelerate a rotation of the drive shaft and transmit the rotation to the wheel hub; and a wet-type brake mechanism housed in a brake chamber formed between the axle housing and the wheel hub, and actuated such that braking is applied to a rotation of the wheel hub relative to the axle housing. Further, floating seals are disposed between a lubrication space and the speed-reducer housing chamber, and a circulation passage for oil that includes an oil filter is connected to the lubrication space.

Abstract: A transmission having an input shaft, piston, dog clutch, sensor sleeve and control system is provided. The dog clutch includes male and female members, where one of the members is coupled to the piston for common movement therewith. The sleeve includes a through channel and a reduced diameter sensor portion terminating at a shoulder. The control system is configured to: command a supply of hydraulic fluid against an engagement side of the piston, determine when a terminal end of the sensor portion contacts a control, and determine that the dog clutch members are in a predetermined partially engaged state less than a fully engaged state of the dog clutch members. A length of the reduced diameter sensor portion directly corresponds to the predetermined partially engaged state of the dog clutch that is less than a fully engaged state of the male and female members of the dog clutch.

Abstract: An oil-flooded single-plate or multi-plate lockup clutch is provided in a torque transfer device. The torque transfer device may, for example, be a converter, a dual clutch, a starting clutch, a manual shifter, or power shifting clutch, having a piston to engage the clutch and a damper. In accordance with the present disclosure, the piston together with a housing of the torque transfer device forms a closed pressure chamber when the clutch is engaged and at least one oil flow opening is provided in the piston in an area outside of the pressure chamber. The torque transfer device preferably has a damper and the piston of the clutch forms a part of the damper and may be designed as a retainer for springs of the damper.

Abstract: A wedge clutch assembly for selectively engaging or disengaging an inner and outer hub including first and second wedge plate segments arranged radially between the inner and outer hubs, the first wedge plate including a first inner circumferential surface having an increasing radius in a first circumferential direction and the second wedge plate segment including a second inner circumferential surface having a decreasing radius in the first circumferential direction, and, third and fourth wedge plate segments arranged radially between the first and second wedge plate segments and the inner hub, the third wedge plate segment including a first outer circumferential surface in contact with the first inner circumferential surface and the fourth wedge plate segment including a second outer circumferential surface in contact with the second inner circumferential surface.

Abstract: An automatic transmission including a clutch that can engage rotation transmission of two rotary members by supplying an engagement pressure to an engagement hydraulic oil chamber disposed on an outer peripheral side of a central shaft to press and move a piston member to one axial side, and disengage the rotation transmission of the two rotary members with an other-side pressing mechanism that presses and drives the piston member to the other axial side.