In a hydraulic clutch actuation system for controlling in particular a clutch-controlled compensation unit of a drivetrain of a motor vehicle, in which hydraulic clutch actuation system a hydraulic pump is used for generating hydraulic pressure in a hydraulic fluid for the purposes of clutch actuation by means of a hydraulic clutch actuation device, provision is made whereby the hydraulic fluid is supplied as clutch oil to the friction members of the friction clutch which are to be oiled with clutch oil (cooling and/or lubricating oil). In this way, improved and more reliable oiling of the clutch can be made possible even at low vehicle speeds and under heavy clutch load, wherein, despite this, very rapid dry-running of the cutches, and low power losses generated by the clutch oiling, are ensured.

A speed differential device of a double overrunning clutch device includes: a left input unit, an left output ring with cam, a right input unit, a right output ring with a cam; and double overrunning clutch device between the left output ring and the right output ring. The double overrunning clutch device includes a left clutch unit and a right clutch unit; and a synchronous unit is installed between the left clutch unit and the left output ring, and between the right clutch unit and the right output ring. The synchronous unit has a left synchronous ring and a right synchronous ring, but rotate independently; an inner surface of each of the left synchronous ring and the right synchronous ring is formed with teeth or tilt teeth; and an outer annular surface of each of the left synchronous ring and right synchronous ring is formed with teeth or tilt teeth.

A speed differential device of a double overrunning clutch device includes: a left input unit, an left output ring with cam, a right input unit, a right output ring with a cam; and double overrunning clutch device between the left output ring and the right output ring. The double overrunning clutch device includes a left clutch unit and a right clutch unit; and a synchronous unit is installed between the left clutch unit and the left output ring, and between the right clutch unit and the right output ring. The synchronous unit has a left synchronous ring and a right synchronous ring, but rotate independently; an inner surface of each of the left synchronous ring and the right synchronous ring is formed with teeth or tilt teeth; and an outer annular surface of each of the left synchronous ring and right synchronous ring is formed with teeth or tilt teeth.

A mechanical locking differential primarily includes a drive ring and right and left driven rings that can move sideways into and out of engagement with the drive ring. The drive ring and the driven rings have teeth with an inverted trapezoidal shape with a significant clearance, such as a pressure angle of 1 and a clearance of 20% circumferentially. A central ramping separator ring provides a ramping mechanism with inclines that push the driven rings out of engagement with the drive ring when the associated half axle rotates faster than the drive ring, with the ramping action occurring within the teeth clearance.

A mechanical locking differential primarily includes a drive ring and right and left driven rings that can move sideways into and out of engagement with the drive ring. The drive ring and the driven rings have teeth with an inverted trapezoidal shape with a significant clearance, such as a pressure angle of 1 and a clearance of 20% circumferentially. A central ramping separator ring provides a ramping mechanism with inclines that push the driven rings out of engagement with the drive ring when the associated half axle rotates faster than the drive ring, with the ramping action occurring within the teeth clearance.

A drive apparatus includes a motor; a reduction gear connected to the motor; a differential connected to the reduction gear, for rotating an axle about a differential axis; a housing including a gear housing portion housing the reduction gear and the differential; and an oil housed in the gear housing portion. The differential includes a gear for rotating about the differential axis. An end portion of the gear is lower than the reduction gear, and is configured to soak in the oil. The housing includes an oil drain hole and an oil feed hole for joining an interior of the housing and a space outside of the housing, a first stopper member removably in the oil drain hole, and a second stopper member removably in the oil feed hole. Each of the oil drain hole and the oil feed hole is in a portion of the gear housing portion.

A drive apparatus includes a motor; a reduction gear connected to the motor; a differential connected to the reduction gear, for rotating an axle about a differential axis; a housing including a gear housing portion housing the reduction gear and the differential; and an oil housed in the gear housing portion. The differential includes a gear for rotating about the differential axis. An end portion of the gear is lower than the reduction gear, and is configured to soak in the oil. The housing includes an oil drain hole and an oil feed hole for joining an interior of the housing and a space outside of the housing, a first stopper member removably in the oil drain hole, and a second stopper member removably in the oil feed hole. Each of the oil drain hole and the oil feed hole is in a portion of the gear housing portion.

A speed differential device of a double overrunning clutch device includes: a left input unit, an left output ring with cam, a right input unit, a right output ring with a cam; and double overrunning clutch device between the left output ring and the right output ring. The double overrunning clutch device includes a left clutch unit and a right clutch unit; and a synchronous unit is installed between the left clutch unit and the left output ring, and between the right clutch unit and the right output ring. The synchronous unit has a left synchronous ring and a right synchronous ring, but rotate independently; an inner surface of each of the left synchronous ring and the right synchronous ring is formed with teeth or tilt teeth; and an outer annular surface of each of the left synchronous ring and right synchronous ring is formed with teeth or tilt teeth.

A speed differential device of a double overrunning clutch device includes: a left input unit, an left output ring with cam, a right input unit, a right output ring with a cam; and double overrunning clutch device between the left output ring and the right output ring. The double overrunning clutch device includes a left clutch unit and a right clutch unit; and a synchronous unit is installed between the left clutch unit and the left output ring, and between the right clutch unit and the right output ring. The synchronous unit has a left synchronous ring and a right synchronous ring, but rotate independently; an inner surface of each of the left synchronous ring and the right synchronous ring is formed with teeth or tilt teeth; and an outer annular surface of each of the left synchronous ring and right synchronous ring is formed with teeth or tilt teeth.

Provided is a work vehicle having a compact braking device. The work vehicle includes a drive shaft part to which power generated by a power source is transmitted and which transmits the power to drive wheels via a differential device, and a drive shaft braking mechanism which generates a braking force on the drive shaft part when a brake pedal is depressed.