Hydraulic apparatus

Claim 1

A HYDRAULIC PUMP OR MOTOR COMPRISING A ROTATABLY MOUNTED DRIVE SHAFT, A DRIVE FLANGE FAST ON THE DRIVE SHAFT, A PLURALITY OF SLIPPERS CAPABLE TO AXIAL SLIDING MOVEMENT IN BORES IN THE DRIVE FLANGE, A ROTARY CYLINDER BARREL MOUNTED FOR ROTATION ABOUT AN AXIS INCLINED OR INCLINABLE TO THE DRIVE FLANGE AXIS AND HAVING A PLURALITY OF CYLINDERS PARALLEL OR INCLINED TO THE ROTAION AXIS, PISTONS SLIDABLY MOUNTED ONE IN EACH CYLINDER, PISTON RODS ARTICULATED TO THE PISTONS AND THE SLIPPERS TO FORM A PLURALITY OF ASSEMBLIES EACH COMPRISING A SLIPPER, A PISTON AND A PISTON ROD, A WEAR PLATE MOUNTED ADJACENT TO THE DRIVE FLANGE, THE WEAR PLATE INCLUDING A FLAT SURFACE AGAINST WHICH THE SLIPPERS ARE ADAPTED TO BEAR DURING ROTATION OF THE DRIVE FLANGE AND CYLINDER BARREL, A RADIAL THRUST BALL OR ROLLER BEARING FOR THE DRIVE SHAFT MOUNTED ADJACENT TO THE DRIVE FLANGE AND A BEARING HOUSING SECURING THE OUTER RACE MEMBER OF THE BEARING IN POSITION, ONE END SURFACE OF THE RACE MEMBER BEING LOCATED AGAINST A MACHINED SURFACE IN THE BEARING HOUSING AND THE OTHER END SURFACE OF THE RACE MEMBER FORMING A SUPPORT SURFACE AGAINST WHICH THE WEAR PLATE IS AXIALLY URGED BY THE FORCE EXERTED BY THE SLIPPERS, THE WEAR PLATE INCLUDING AN ANNULAR PROJECTION BY WHICH IT BEARS AGAINST THE SAID RACE MEMBER, AND SAID PROJECTION BEING CONCENTRIC WITH THE CIRCULAR PATH OF THE SLIPPERS ON THE FLAT SURFACE.