The cardan joint of a car has such several positions as:

1. For front-drive and rear-drive vehicles, universal joints will be installed at both ends of the transmission shaft if there is a transmission shaft.

2. In the present car, ball cages are installed at both ends of the half axle, and the ball cages belong to universal joints.

3. There will be universal joints in the steering control mechanism of some taxis, which also appear in pairs.

Thre are still some places where there are few applications, so there are no examples.

His role is very simple, in order to achieve different angles of equal-ratio transmission.

Taking the half axle as an example, when the driver turns, the position of the engine and the transducer does not move, but the wheel obviously needs to deflect an angle. In this case, the power needs to be transferred to the wheel, and the universal joint acts as a timely wheel deflection, and still provides power to the wheel in equal proportion.