I have heard certain AWD cars have an epicyclic center differential that provides more torque to the rear axles than the front axles. I have watched a video by KYLE.ENGINEERS
and he says it can do this torque split with no relative rotation between any of the gears.
How can it give more torque to the rear axles with no relative rotation between the gears? In order to multiply torque, doesn't there have to be relative rotation between the gears?