Hydraulic machines

Claim 1

AN HYDRAULIC MACHINE COMPRISING THE COMBINATION OF A RIGHT HOUSING, A SHAFT ROTATABLY WITHIN THE HOUSING A RIGID CAM BLOCK RIGIDLY SECURED WITHIN THE HOUSING AND PROVIDING A CAM FACE EXTENDING IN A PLANE INCLINED TTO THE SHAFT AXIS, A ROTOR ENCLOSURE WITHIN THE HOUSING AND DRIVINGLY COUPLED TO THE SHAFT, SAID ROTOR BEING FORMED WITH A PLURALITY OF PASSAGES, A PAIR OF PORTS IN ONE END OF THE HOUSING ARRANGED SO THAT DURING ROTATION OF THE ROTOR THE PASSAGES THEREIN ARE BROUGHT SUCCESSIVELY INTO COMMUNICATION WITH THE PORTS, A PLURALITY OF PISTONS SLIDABLE RESPECTIVELY IN THE PASSAGES AND PROJECTING FROM ONE END OF THE ROTOR TOWARDS THE CAM FACE, A PLURALITY OF CUP-SHAPED SLIPPERS MOUNTED RESPECTIVELY ON THE PISTONS WHERE THESE PROJECT FROM THE ROTOR, EACH SLIPPER INCLUDING A SKIRT PORTION ENCIRCLING THE PISTON, A CUPPED END FACE REMOTE FROM THE SKIRT PORTION AND INCLINED TO THE AXIS OF THE SKIRT PORTION AT AN ANGLE EQUAL TO THE INCLINATION OF THE CAM FACE TO THE SHAFT AXIS AND A PORTION ENGAGED DIRECTLY AGAINST THE END OF THE ASSOCIATED PISTON, AND A PLURALITY OF ELASTOMERIC RINGS COUPLING THE RESPECTIVE SLIPPERS TO THE PISTONS, EACH RING BEING SEALINGLY BONDED TO THE INTERIOR OF THE ASSOCIATED SKIRT PORTION AND TO THE PISTON AND EACH PISTON/SLIPPER COMBINATION HAVING A RESTRICTED BORE CONNECTING THE INTERIOR OF THE ASSOCIATED PASSAGE TO THE INTERIOR OF THE SLIPPER TO FORM BETWEEN EACH SLIPPER AND THE CAM FACE, A HYDROSTATIC BEARING.