When a vehicle is driving on the road, the wheels perform two motions relative to the ground, namely sliding and rolling. In order to reduce friction, tire wear and power consumption when the vehicle is running, the wheels should be rolled as much as possible to reduce slippage. However, when the car turns or drives on an uneven road, the wheels on both sides move at different distances. If the two wheels are connected by a rigid shaft, slippage will inevitably occur during driving, which will reduce the driving performance of the vehicle. Therefore, the wheels on both sides of the same drive axle need to be driven by two half shafts respectively, so that the left and right wheels can rotate at different speeds, so as to ensure the pure rolling of the wheels as much as possible. Off-road vehicles need to drive on bumpy, muddy, slippery, soft and other road surfaces or even no roads, and these ground adhesion coefficients are small. When one wheel is located on the ground with a small adhesion coefficient, although the adhesion coefficient between the other wheel and the ground is good, the traction force that the car can achieve cannot be effectively utilized, resulting in the car not driving normally.
To solve the above problems that may occur in off-road vehicles, it is necessary to use a differential device with anti-skid function. Common methods include differential locks and limited-slip differentials. The differential lock is locked together with the axle shaft of the car through the differential housing, which can stop the differential action. increase to the maximum. However, the differential lock needs to be manually locked when entering a difficult road section. If it is not released in time in a good road section, the car may cause an accident due to the lack of differential action. Therefore, most modern off-road vehicles do not use differential locks. A limited slip differential is used instead.