Patent ID: 6287086
Filing Date: 2001-09-11
Classification: F04B

Abstract:
A pump for hydraulic fluid, said pump comprising:a housing having a fluid inlet and a fluid outlet with a longitudinal axis both of which opening into an inner chamber;a cylinder block with a plurality of piston bores and supported within the inner chamber for rotation about a longitudinal axis, wherein during rotation each piston bore alternately communicates with the fluid inlet and a fluid outlet, the cylinder block including an element with a spherically curved surface and further including a coupling for a rotating drive member;a socket having an aperture with a curved surface that mates with the spherically curved surface of the element of the cylinder block, the socket having a drive surface that is non-orthogonal to the longitudinal axis;a plurality of pistons each slidably located within a different one of the plurality of piston bores and having a head which engages the drive surface of the socket; anda coupling bearing which extends between the housing and the socket to support the cylinder block axially for rotational movement within the inner chamber.