汽车传动轴是万向传动装置的传动轴中能够传递动力的轴。它是一个高转速、少支承的旋转体，因此它的动平衡是至关重要的。一般传动轴在出厂前都要进行动平衡试验，并在平衡机上进行了调整。对前置引擎后轮驱动的车来说是把变速器的转动传到主减速器的轴，它可以是好几节的，节与节之间可以由万向节连接。传动轴是汽车传动系中传递动力的重要部件，它的作用是与变速箱、驱动桥一起将发动机的动力传递给车轮，使汽车产生驱动力。
Automobile transmission shaft is the shaft which can transmit power in the transmission shaft of universal transmission device. It is a rotating body with high speed and few supports, so its dynamic balance is very important. In general, the transmission shaft should be put into the dynamic balance test before leaving the factory, and adjusted on the balancing machine. For the front engine rear wheel drive vehicle, the transmission rotation is transmitted to the shaft of the final drive. It can be several joints, and the joints can be connected by universal joints. Transmission shaft is an important part of transmission power in automobile transmission system. Its function is to transmit engine power to wheels together with gearbox and drive axle, so as to generate driving force for automobile.