A differential mechanism includes: a rotating frame rotatably provided in a main body frame; an inner worm gear formed in a cylindrical shape, covering the outer periphery of the rotating frame, and rotatably provided coaxially with the rotating frame, and having a spiral tooth formed on the cylindrical inner side; and a worm wheel rotatably provided on the rotating frame in a direction orthogonal to an axis of the rotating frame and meshing with the inner worm gear.

A differential self-locking device includes a differential housing, a half-shaft output gear set disposed in the differential housing, an upper worm and worm gear mechanism, a lower worm and worm gear mechanism, a differential planetary gear set, and a worm gear shaft. The upper worm and worm gear mechanism and the lower worm and worm gear mechanism respectively convert a large output torque of the left half-shaft output gear and a large output torque of the right half-shaft output gear into small output torque thereof to lock the left half-shaft output gear and the right half-shaft output gear, thereby achieving automatic locking or unlocking of the differential self-locking device. A traction force of a vehicle is converted into torques of the left half-shaft output gear and the right half-shaft output gear, which improves passing ability of the vehicle.

A differential self-locking device includes a differential housing, a half-shaft output gear set disposed in the differential housing, an upper worm and worm gear mechanism, a lower worm and worm gear mechanism, a differential planetary gear set, and a worm gear shaft. The upper worm and worm gear mechanism and the lower worm and worm gear mechanism respectively convert a large output torque of the left half-shaft output gear and a large output torque of the right half-shaft output gear into small output torque thereof to lock the left half-shaft output gear and the right half-shaft output gear, thereby achieving automatic locking or unlocking of the differential self-locking device. A traction force of a vehicle is converted into torques of the left half-shaft output gear and the right half-shaft output gear, which improves passing ability of the vehicle.

A differential self-locking device includes a differential housing, a half-shaft output gear set disposed in the differential housing, an upper worm and worm gear mechanism, a lower worm and worm gear mechanism, a differential planetary gear set, and a worm gear shaft. The upper worm and worm gear mechanism and the lower worm and worm gear mechanism respectively convert a large output torque of the left half-shaft output gear and a large output torque of the right half-shaft output gear into small output torque thereof to lock the left half-shaft output gear and the right half-shaft output gear, thereby achieving automatic locking or unlocking of the differential self-locking device. A traction force of a vehicle is converted into torques of the left half-shaft output gear and the right half-shaft output gear, which improves passing ability of the vehicle.

A differential self-locking device includes a differential housing, a half-shaft output gear set disposed in the differential housing, an upper worm and worm gear mechanism, a lower worm and worm gear mechanism, a differential planetary gear set, and a worm gear shaft. The upper worm and worm gear mechanism and the lower worm and worm gear mechanism respectively convert a large output torque of the left half-shaft output gear and a large output torque of the right half-shaft output gear into small output torque thereof to lock the left half-shaft output gear and the right half-shaft output gear, thereby achieving automatic locking or unlocking of the differential self-locking device. A traction force of a vehicle is converted into torques of the left half-shaft output gear and the right half-shaft output gear, which improves passing ability of the vehicle.

A differential includes a differential case; a side gear; a pinion configured for meshing engagement with the side gear; and a pinion housing configured to support the pinion. The pinion housing includes a first face; a second face opposing the first face; a first projection located on the first face; and a second projection located on the second face. The pinion housing also includes an aperture or hole extending radially inwardly from an outer radial surface of the generally annular ring; and a channel extending from the first face to the second face, wherein the channel is substantially radially aligned with the aperture or hole. In embodiments, the pinion housing includes one or more transfer formations configured to transfer torque from the differential case, and the pinion housing is configured to permit movement in an axial direction between a pair of side gears.

A differential includes a differential case; a side gear; a pinion configured for meshing engagement with the side gear; and a pinion housing configured to support the pinion. The pinion housing includes a first face; a second face opposing the first face; a first projection located on the first face; and a second projection located on the second face. The pinion housing also includes an aperture or hole extending radially inwardly from an outer radial surface of the generally annular ring; and a channel extending from the first face to the second face, wherein the channel is substantially radially aligned with the aperture or hole. In embodiments, the pinion housing includes one or more transfer formations configured to transfer torque from the differential case, and the pinion housing is configured to permit movement in an axial direction between a pair of side gears.

A differential includes a differential case; a side gear; a pinion configured for meshing engagement with the side gear; and a pinion housing configured to support the pinion. The pinion housing includes a first face; a second face opposing the first face; a first projection located on the first face; and a second projection located on the second face. The pinion housing also includes an aperture or hole extending radially inwardly from an outer radial surface of the generally annular ring; and a channel extending from the first face to the second face, wherein the channel is substantially radially aligned with the aperture or hole. In embodiments, the pinion housing includes one or more transfer formations configured to transfer torque from the differential case, and the pinion housing is configured to permit movement in an axial direction between a pair of side gears.

A differential includes a differential case; a side gear; a pinion configured for meshing engagement with the side gear; and a pinion housing configured to support the pinion. The pinion housing includes a first face; a second face opposing the first face; a first projection located on the first face; and a second projection located on the second face. The pinion housing also includes an aperture or hole extending radially inwardly from an outer radial surface of the generally annular ring; and a channel extending from the first face to the second face, wherein the channel is substantially radially aligned with the aperture or hole. In embodiments, the pinion housing includes one or more transfer formations configured to transfer torque from the differential case, and the pinion housing is configured to permit movement in an axial direction between a pair of side gears.

A transmission device (1) includes a gearbox (10), a motor set (20) and a braking set (30). The gearbox (10) includes a housing (11) and a transmission set (12) arranged in the housing (11), and the housing (11) includes a socket (111). The motor set (20) includes a motor body (21) and a rotating shaft (22) disposed protrusively from the front side of the motor body (21). The rotating shaft (22) is inserted in the socket (111) and connected to the transmission set (12). The braking set (30) is installed on the rotating shaft (22) and positioned in the socket (111), and the braking set (30) applies braking force on the rotating shaft (22). Therefore, the effect of saving space at the end of the motor is achieved.