Epicyclic power transmission mechanisms

Claim 1

FOR USE IN AN ENGINE-DRIVABLE ROAD VEHICLE HAVING A DOUBLE CLUTCH, AN EPICYCLIC POWER TRANSMISSION MECHANISM OF THE KIND SPECIFIED COMPRISING IN COMBINATION A PAIR OF CONCENTRIC INPUT SHAFTS ADAPTED TO BE DRIVEN BY THE VEHICLE ENGINE THROUGH DIFFERENT PARTS OF THE DOUBLE CLUTCH, A PAIR OF COAXIAL SUN PINIONS WHICH ARE OF DIFFERENT DIAMETERS, AND WHICH ARE RIGIDLY UNITED RESPECTIVELY WITH SAID INPUT SHAFTS, A PAIR OF TOOTHED REACTION MEMBERS WHICH ARE ROTATABLY SUPPORTED ON THE SAME AXIS AS SAID INPUT SHAFTS, AND WHICH HAVE ASSOCIATED THEREWITH MEANS FOR CONTROLLING ROTATION THEREOF, AN ASSEMBLY OF PLANET PINIONS IN ENGAGEMENT WITH SAID SUN PINIONS AND SAID TOOTHED REACTION MEMBERS, A POWER OUTPUT MEMBER IN THE FORM OF A ROTATABLE CARRIER ON WHICH SAID PLANET PINIONS ARE MOUNTED, AN INTERNALLY TOOTHED ANNULUS ROTATABLY SUPPORTED ON SAID AXIS AND ENGAGING AT LEAST ONE OF SAID PLANET PINIONS, MEANS FOR HOLDING SAID ANNULUS AGAINST ROTATION TO CAUSE THE NORMAL DIRECTION OF ROTATION OF SAID POWER OUTPUT MEMBER TO BE REVERSED, AND A FRICTION CLUTCH WHEREBY THE OUTER INPUT SHAFT IS CONNECTIBLE TO ONE OF SAID REACTION MEMBERS.