Hydraulic pump or motor

Claim 1

A HYDRAULIC DEVICE COMPRISED OF A HOUSING, A SINGLE SHAFT ROTATABLY SUPPORTED IN SAID HOUSING IN A PAIR OF SPACED BEARINGS, CARRIED BY SAID HOUSING, A PLURALITY OF MEMBERS ROTATABLE WITH SAID SINGLE SHAFT AND POSITIONED BETWEEN SAID BEARINGS, SAID MEMBERS DEFINING A PLURALITY OF CHAMBERS WHICH INCREASE AND DECREASE IN VOLUME AS THE SHAFT ROTATES, SOME OF SAID CHAMBERS CONTAINING HYDRAULIC FLIID AT A HIGH PRESSURE THEREBY CREATING AN UNSYMMETRICAL RADIAL FORCE WHICH IS TRANSMITTED TO SAID SHAFT AND FROM SAID SHAFT TO SAID BEARINGS AND THEN FROM SAID BEARINGS TO SAID HOUSING, THE IMPROVEMENT WHICH COMPRISES SAID BEARINGS BEING IN THE FORM OF A SLEEVE HAVING A SHAFT FACING INNER SURFACE, PORTIONS OF SAID INNER SURFACE BEING IN SEALING ENGAGEMENT WITH SAID SHAFT AND OTHER PORTIONS OF SAID INNER SURFACE BEING RADIALLY SPACED THEREFROM TO DEFINE, WITH THE INNER SURFACE OF THE SLEEVE, A HIGH PRESSURE RECESS AND A LOW PRESSURE RECESS CIRCUMFERENTIALLY SPACED FROM EACH OTHER AROUND THE SLEEVE AND SEALED FROM EACH OTHER BY THE SEALING PORTIONS ON THE SLEEVE, MEANS COMMUNICATING SAID HIGH AND LOW PRESSURE RECESSES RESPECTIVELY TO HIGH AND LOW PRESSURE AREAS OF THE DEVICE, SAID HIGH PRESSURE RECESS BEING LOCATED ON THE SIDE OF SAID SHAFT DIAMETRICALLY OPPOSITE FROM SAID CHAMBERS CONTAINING HIGH PRESSURE FLUID THEREBY CREATING A HYDRAULIC FORCE ON SAID SHAFT OPPOSITE TO SAID FIRST-MENTIONED HYDRAULIC FORCE, SAID LOW PRESSURE RECESS EXTEND-