P.S: correct me if I am wrong
shafts are used to transmit powers....bulldozeryeah,its the same thing...
along with that they are also sometimes used for supporting mechanical members which they drive.
in the case of an automobile, there are many kinds of shafts, propeller shaft, crankshaft, camshaft, layshaft ,etc. which shaft do you want to know about specifically ?
camshaft : it is present in the engine and works synchronously with the crankshaft. it consists of cams which accurately time and operate the inlet and exhaust valves.
layshaft : this is present in the gear box.
In a large portion of the car vehicles, the motor is situated at the front and the back wheels of the vehicle are being driven. This plan stipulates a more extended propeller shaft to be utilized. In a few plans a few propeller shafts are utilized to make up the length.
In a few vehicles, the motor is kept at the front and the front wheels of the vehicle are being driven. In some different vehicles, the motor is at the back and the back wheels are being driven. For such courses of action a short propeller shaft is utilized to drive each wheel.
The motor and the transmission unit are connected to the vehicle outline with some adaptable mounting. The back pivot lodging with differential and wheels are connected to the vehicle outline by suspension springs.
Because of the above course of action, the transmission yield shaft and the info shaft to the back pivot lodging are in various planes. This constrains the propeller shaft that associates these two shafts to be kept slanted.