Differential transmission

Claim 1

A TRANSMISSION COMPRISING A ROTATABLE CASING FOR TRANSMITTING AN INPUT TORQUE, A PAIR OF COAXIALLY ALIGNED ROTATABLE ELEMENTS MOUNTED IN SAID CASING AND ADAPTED TO BE CONNECTED RESPECTIVELY TO A PAIR OF SHAFTS, EACH OF SAID ELEMENTS HAVINGA PLURALITY OF CIRCUMFERENTIALLY ARRANGED AND RADIALLY OUTWARDLY DIRECTED RISE AND FALL CAM SURFACES, SAID CASING HAVING MEANS DEFINING IN AXIALLY SPACED RELATION TWO GROUPS OF CIRCUMFERENTIALLY ALIGNED AND A RADIALLY INWARDLY DIRECTED PRESSURE CHAMBERS, ONE OF SAID GROUPS FACING THE CAM SURFACES OF ONE OF SAID ELEMENTS AND THE OTHER OF SAID GROUPS FACING THE CAM SURFACES OF THE OTHER OF SAID ELEMENTS, THE PRESSURE CHAMBERS OF SAID TWO GROUPS EACH BEING IN TWO SETS, RESTRICTIVE PASSAGE MEANS ASSOCIATED WITH EACH GROUP PROVIDING FLUID COMMUNICATION IN EACH GROUP BETWEEN THE TWO SETS OF PRESSURE CHAMBERS THEREOF, PISTONS IN SAID TWO GROUPS OF PRESSURE CHAMBERS OPERATIVELY ENGAGING THE CAM SURFACES THAT ARE FACES BY THEIR RESPECTIVE GROUPS OF PRESSURE CHAMBERS FOR RECIPROCATION IN RESPONSE TO ROTATION OF THEIR ASSOCIATED ELEMENTS RELATIVE TO SAID CASING, SAID TWO GROUPS OF PRESSURE CHAMBERS AND THEIR ASSOCIATED CAM SURFACES BEING ARRANGED SO THAT WHEN RELATIVE ROTATION OCCURS BETWEEN SAID CASING AND EITHER OF SAID ELEMENTS THE PISTONS ASSOCIATED WITH THE CAM SURFACES OF SUCH ELEMENT RECIPROCATE TO TRANSFER THE FLUID IN THE ASSOCIATED GROUP OF PRESSURE CHAMBERS BACK AND FORTH BETWEEN ITS TWO SETS VIA THE ASSOCIATED PASSAGE MEANS.