The rear axle refers to the rear drive shaft component of the vehicle power transmission. It consists of two half-bridges, which can implement half-bridge differential motion. At the same time, it is also a device used to support the wheels and connect the rear wheels. If it is a vehicle driven by the front axle, the rear axle is only a follow-up axle, which only plays a bearing role. If the front axle is not a drive axle, then the rear axle is a drive axle. At this time, in addition to the load-bearing function, it also plays the role of driving, deceleration and differential speed. If it is four-wheel drive, there is generally one in front of the rear axle. Transfer case. The rear axle is divided into an integral bridge and a half bridge.