초록 ▼

An in-line axial piston hydraulic pump has a cylinder block with a plurality of bores in which separate pistons slide. The cylinder block is supported on one side by a bearing and axle arrangement. The other side of the cylinder block has an integral shaft with a ball that is received in a spherical

An in-line axial piston hydraulic pump has a cylinder block with a plurality of bores in which separate pistons slide. The cylinder block is supported on one side by a bearing and axle arrangement. The other side of the cylinder block has an integral shaft with a ball that is received in a spherically concave socket coupled to the housing. The socket provides a drive surface that is non-orthogonal to the rotational axis of the cylinder block and the pistons ride against that surface. The engagement of the pistons with that socket surface produces the sliding movement of the pistons within the bores and thus the pumping action.

대표청구항 ▼

[ What is claimed is:] [1.]1. 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

[ What is claimed is:] [1.]1. 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.