Power transmission

Claim 1

IN A HYDRAULIC PUMP OR MOTOR OF THE RADIAL PISTON TYPE THE COMBINATION OF A HOUSING HAVING A DRIVE SHAFT JOURNALLED THEREIN, A CYLINDER BLOCK MOUNTED SLIDABLY ON SAID DRIVE SHAFT AND KEYED TO IT FOR POSITIVE ROTATION, MEANS FORMING A STATIONARY PLANE VALVING SURFACE ON THE INTERIOR OF SAID HOUSING AT RIGHT ANGLES TO THE DRIVE SHAFT AXIS, PORT OPENINGS ON SAID STATIONARY VALVING SURFACE TO PERMIT FLOW OF FLUID TO AND FROM SAID CYLINDER BLOCK, A ROTARY VALVING SURFACE ON SAID CYLINDER BLOCK ON THE SIDE FACING SAID STATIONARY VALVING SURFACE ON THE INTERIOR OF THE HOUSING, AXIALLY SLIDABLE FLUID PRESSURE RESPONSIVE BEARING MEANS ALSO ON THE INTERIOR OF THE HOUSING BUT OPPOSITE TO SAID STATIONARY VALVING SURFACE, SAID AXIAL BEARING MEANS SLIDABLY ENGAGING THE CYLINDER BLOCK AND URGING IT TOWARD SAID STATIONARY VALVING SURFACE IN OPPOSITION TO THE FORCES TENDING TO SEPARATE THE ROTATING CYLINDER BLOCK FROM THE STATIONARY VALVING SURFACE, SAID AXIAL BEARING MEANS BEING DIVIDED INTO TWO SEPARATE SECTIONS, ONE SECTION ACTING IN OPPOSITION TO SEPARATING FORCES EXISTING IN THE VALVING AREA OF ONE PORT OPENING ON SAID STATIONARY VALVING SURFACE AND BEING IN DIRECT AND UNINTERRUPTED COMMUNICATION WITH THIS PORT OPENING, AND THE SECOND SECTION ACTING IN OPPOSITION TO SEPARATING FORCES EXISTING IN THE VALVING AREA OF A SECOND PORT OPENING ON SAID STATIONARY VALVING SURFACE AND BEING IN DIRECT AND UNINTERRUPTED COMMUNICATION WITH THAT SECOND PORT OPENING.