A differential is a particular type of simple planetary gear train that has the property that the angular velocity of its carrier is the average of the angular velocities of its sun and annular gears.
In this model all the necessary parts of the differential gear are shown in an actual working form.
This model helps the student to understand the working of the differential gear very easily.
It has been especially made dissectible for demonstration purposes.
Students can appreciate how in automobiles and other wheeled vehicles, the differential allows the outer drive wheel to rotate faster than the inner drive wheel during a turn. Thus the average of the rotational speed of the two driving wheels equals the input rotational speed of the drive shaft.