Final Drive Differential

The differential in a RWD vehicle is situated on the rear axle of the vehicle.
The internal components of a Final Drive Differential include:
- A Crown Wheel and a driving Pinion Gear



- Bevel Gears and smaller Pinion Gears (mounted on a driving pin)



How it works:
As the gearbox spins the drive shaft, the driving pinion gear on the end of it works in motion with the crown wheel which transfers the movement of the drive shaft through 90 degrees so that it can move the wheels. For the wheels to move, the two half shafts of the axle are splined into the holes of the bevel gears, this means that there is an allowance for different rotation speed through the two wheels.


This video gives a great explanation:
http://www.youtube.com/watch?v=wgGmHVV26lE