Traditional automobile power comes from engine → clutch → transmission → transmission shaft → universal transmission → main reducer → differential → half shaft → driving wheel.

The output component of the engine is the flywheel, which is fixedly connected with the clutch pressure plate (driving plate), and the clutch driven plate is generally splined with the first shaft (input shaft) of the transmission, and the pressure plate and the driven plate are contacted or separated by the clutch operating mechanism.

One shaft of the transmission inputs power and two shafts output power (some transmissions have intermediate shafts, others don't). Usually, the drive shaft is connected by a flange.

Universal transmission device is the general name of all devices that transmit power by angle. The transmission shaft is only one kind of universal transmission device, which only transmits power and has no input or output. Flanges at both ends are generally connected with the output flange of the transmission and the input method bar of the main reducer.

The main reducer includes a driving gear, a driven gear, a differential and a half shaft. The input flange of the main reducer is connected with the driving gear, and the power is output through the driving gear, the driven gear and the half shaft. The main reducer does not participate in power transmission, but mainly balances the different steering situations of the left and right wheels.

One end of the half shaft is connected with the driven gear of the main reducer (it needs to pass through the differential, otherwise the differential cannot be used), and the other end is connected with the hub, which is equipped with wheels (including tires and rims).