An axial piston pump has a swash-plate construction, in particular for hydraulic systems. A cylinder drum (3) can be rotationally driven about a rotational axis (7) in a pump housing (1). Pistons (9) are axially displaceable and support at their actuation ends a swash plate (15). The swash plate can be pivoted by an adjusting device (21) to the desired angles of inclination relative to the rotational axis (7) for adjusting the stroke of the pistons (9) and the fluid pressure generated. The adjusting device has an adjusting piston (35) in a hydraulically actuated adjusting cylinder (31). Their movement can be transmitted to the swash plate (15) by a driven connection having a pivot joint (37, 39; 29, 43). The pivot joint is formed by a ball joint (37, 39) arranged between the piston (35) and the piston rod (41) of the adjusting cylinder (31).

A piston for an axial machine includes a piston body having a cavity that is closed in a pressure-tight way. The cavity is divided into a plurality of chambers, arranged one beside the other in cross-section.

An axial hydraulic pump-motor, in which a cylinder block having a plurality of cylinder bores on a valve plate having a high-pressure side port and a low-pressure side port for controlling an amount of reciprocation of a piston in each of the cylinder bores, the hydraulic pump-motor includes: a residual pressure release port provided on the valve plate and communicating until the cylinder bore on a top dead center side communicates with the low-pressure side port; a residual pressure acquisition portion obtaining a value of a residual pressure in the cylinder bore on the top dead center side; and a directional switching valve switching a flow path between the residual pressure release port and an hydraulic oil tank and a flow path between the residual pressure release port and the low-pressure side port.

A swash plate type liquid-pressure rotating device includes a movement restricting mechanism configured to restrict a movement of a spherical bushing relative to a rotating shaft toward a first side in an axial direction. The movement restricting mechanism is a restricting member such that a portion of the spherical bushing which portion is located at the first side in the axial direction contacts the restricting member. The swash plate type liquid-pressure rotating device further includes: a stopper attached to the rotating shaft; and a gap adjusting member. The gap adjusting member is inserted into a gap G3 formed between the stopper and the bearing when the spherical bushing, the retainer plate, the shoe, and the swash plate tightly contact one another in the axial direction. The gap adjusting member restricts a movement of the rotating shaft relative to the casing toward the first side in the axial direction.

A pressure medium powered device generating a reciprocating motion, which includes a body (5), a primary piston (2), a control valve assembly, and at least one secondary piston (3, 4). The primary piston (2) is fitted inside the body (5). The control valve assembly is configured to move the primary piston (2) back and forth. The secondary piston (3, 4) is attached to the primary piston (2). The primary piston (2) includes a first conical surface (20) and the secondary piston (3, 4) includes a corresponding second conical surface (21), whereby the primary piston (2) and the secondary piston (3, 4) are aligned to each other by means of the first conical surface (20) and the second conical surface (21).

A shoe for use with a hydraulic piston motor or pump is disclosed herein. The shoe includes an upper portion configured to receive the hydraulic piston, a lower portion configured to contact a swashplate, a counterbore formed in the lower portion, a vertical channel extending through the upper portion and the lower portion into the counterbore, and a seal disposed within the counterbore and extending around a circumference of the counterbore.

A hydraulic piston motor/pump includes a first rotor including a first cylinder, a second rotor opposing the first rotor and including a second cylinder that opposes the first cylinder, a first swashplate including a first angled face adjacent the first rotor, a second swashplate adjacent the second rotor and opposing the first swashplate. The hydraulic piston motor/pump further includes a first shoe cage including a first piston opening, a second shoe cage including a second piston opening, a piston configured to travel into and out of the first cylinder and the second cylinder, a piston shoe configured to engage the piston, the first shoe cage, and the second shoe cage, and a shaft engaging the first shoe cage and the second shoe cage. The shaft configured to rotate in response to a rotation of the first shoe cage and the second shoe cage.

The present invention relates to a compression ring (6) for a piston slipper arrangement (2), wherein the piston slipper arrangement (2) comprises a piston slipper body (3) and a ceramic sliding element (7) and is configured to be provided in an axial piston machine, wherein the compression ring (6) is configured to compress the ceramic sliding element (7). The objective of the present invention is to provide a compression ring (6) which allows an easy assembly of a piston slipper arrangement (2). This objective is solved by a compression ring (6) that comprises first engagement means (8) configured for engaging with corresponding second engagement means (9) of the piston slipper body (3) in order to limit rotation of the compression ring (6) relative to the piston slipper body (3). The invention further relates to a piston slipper arrangement and to an axial piston machine.