For front-rear-drive cars, the torque from the engine is transmitted to the rear wheels through the clutch, gearbox, universal joint, drive shaft, final drive, differential, and half shaft in turn, so the rear wheel is also called Drive wheel.The torque obtained by the driving wheel gives the ground a backward force, and therefore causes the ground to produce a forward reaction force against the driving wheel. This reaction force is the driving force of the car.The front wheel of a car and the drive train generally have no direct power connection, so they are called driven wheels.

　　The composition and layout of the drive train vary with the type of engine, the installation location, and the purpose of the car.For example, off-road vehicles mostly use four-wheel drive, and transfer cases and other assemblies are added to its drive train.For a front-drive vehicle, there is no drive shaft and other devices in its drive train.

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