Rotary hydraulic apparatus

Claim 1

A HYDRAULICALLY DRIVEN MOTOR COMPRISING A SEPARATE CYLINDRICALLY SHAPED CYLINDER BLOCK HAVING OPPOSITE SIDES AND SUPPORTED FOR ROTATION ABOUT AN AXIS, SAID CYLINDER BLOCK HAVING A PLURALITY OF CIRCUMFERENTIALLY SPACED CYLINDER BORES EXTENDING PARALLEL TO THE AXIS OF THE CYLINDER BLOCK, A PAIR OF PISTONS END TO END IN EACH OF SAID BORES, SEPARATE FLUID SUPPLY PASSAGE MEANS FOR EACH RESPECTIVE CYLINDER BORE EXTENDING PARALLEL TO THE AXIS OF SAID CYLINDER BLOCK FROM THE SIDE OF SAID CYLINDER BLOCK TO SAID CYLINDER BORE FOR TRANSFERRING FLUID THEREBETWEEN, CAM MEANS ON EACH SIDE OF SAID CYLINDER BLOCK FOR OPERATING RESPECTIVE PISTONS WITH EACH CAM MEANS HAVING A PLURALITY OF CAM LOBES LESS THAN THE NUMBER OF CYLINDER BORES FOR ACTUATING EACH PAIR OF PISTONS THROUGH A PLURALITY OF STROKES FOR EACH ROTATION OF THE CYLINDER BLOCK, VALVE MEANS ENGAGING ONE SIDE OF SAID CYLINDER BLOCK AND HAVING A PAIR OF SUPPLY AND DISCHARGE PASSAGES FOR EACH CAM LOBE ON ONE SIDE TO DELIVER AND RECEIVE FLUID ON EACH STROKE OF A RESPECTIVE PAIR OF PISTONS AND SEPARABLE ANNULAR SUPPLY AND EXHAUST CHAMBERS FORMED ON THE SIDE OF THE VALVE MEANS OPPOSITE TO SAID CYLINDER BLOCK FOR PRODUCING SUBSTANTIALLY UNIFORM ANNULAR SEALING PRESSURE AGAINST SAID CYLINDER BLOCK, SAID PISTONS ROTATING SAID CYLINDER BLOCK BY THE REACTION FORCES BETWEEN SAID LOBES AND SAID CYLINDER BLOCK CREATED BY THE FLUID PRESSURE ACTING ON SAID PISTONS.