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Car differential with internal gears

Input is the case with pulley of n1 constant velocity. Output are the blue and green identical internal gear shafts of n2 and n3 velocities.

The pink and orange gear blocks are identical.

The video shows when the blue shaft slows down, the green one speeds up and vice versa to maintain the equation n1 = (n2 + n3)/2.

The satellite gears turn around their own axles only when n2 or n3 differs from n1.

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