Center Differential Assembly
The center differential is a compound planetary gear set without internally-toothed gears. Input torque is transmitted to the 1st sun gear of the center differential, and from the 1st sun gear the torque is distributed through the 1st pinion to the carrier (output element of front wheel side), and to the 2nd sun gear (output element of rear wheel side) at a certain ratio.
The compound planetary gears use helical gears for quiet operation and strength. The four pinions are arranged to ensure the best motion balance during operation.