A differential gear mechanism includes an input member (111) mounted for rotation with respect to output half-shafts (112, 113), each half-shaft fixedly carrying an output member (114, 115). A coupling member (117) mounted for rotation about an axis radial of the half-shafts (112, 113) positively engages...http://www.google.co.uk/patents/US5928101?utm_source=gb-gplus-sharePatent US5928101 - Differential gear mechanism
