A joint for the angularly adjustable drive-connection of a cylinder block and a driveshaft of a hydrostatic bent axis piston unit. The joint has a shank which is rotatable about its longitudinal axis defining a joint axis, on both ends of the shank roller carriers project radially and basically perpendicular to the joint axis. On each roller carrier a roller is provided rotatable around a roller axis. The rollers are secured in axial direction against slipping-off of the roller carriers by means of an embossed area located axially outside of the roller on the respective distal end portion of the roller carrier.

A joint for the angularly adjustable drive-connection of a cylinder block and a driveshaft of a hydrostatic bent axis piston unit. The joint has a shank which is rotatable about its longitudinal axis defining a joint axis, on both ends of the shank roller carriers project radially and basically perpendicular to the joint axis. On each roller carrier a roller is provided rotatable around a roller axis. The rollers are secured in axial direction against slipping-off of the roller carriers by means of an embossed area located axially outside of the roller on the respective distal end portion of the roller carrier.

A hydraulic pump, in particular an adjustable axial piston pump, has at least one piston (22) movable in a reciprocating manner in a longitudinal direction within a pump housing during operation of the hydraulic pump. The piston (22) has a link head (24), a piston top (54) opposite the link head (24), and at least one hollow chamber (60) surrounded at least partially by a piston housing (62) that substantially or completely terminates each hollow chamber (60) towards the outside. A piston (22) for such hydraulic pump is also provided.

A method for coating a pump component (23, 31), in particular, a part of an axial piston pump (7), having the steps of providing a blank of the component (23, 31), providing at least one recess in the blank, filling a powdery coating material into the associated recess, melting the coating material under a protective gas atmosphere and material-removing processing of the blank to form at least one sliding and/or bearing surface (6) from the coating.

A hydraulic machine comprising: an outer casing comprising a first front plate and a second front plate, a shaft rotatable about a main axis, a first rotor comprising a first rotor body rotatable with said shaft around said main axis, and a plurality of first pistons with respective spherical ring heads fixed to said first rotor body, a second rotor comprising a second rotor body and a plurality of second pistons with respective spherical ring heads, wherein the second rotor is rotatable about a secondary axis, inclined with respect to said main axis, a plurality of sleeves that are separate and independent from each other, each having a cylinder open at opposite ends and engaged on opposite sides by a first piston and by a second piston.

A bent axis plunger-type variable hydraulic motor pump, including a cylinder body, a plunger, a ball connecting rod, a plunger spherical hinge, a multistage ball track spherical hinge shaft, a multistage ball track bearing ring, a retainer plate, an oil distributing plate, an oil distributing plate pin shaft, a suspension circle, a bushing bearing ring, a box bushing shaft, a box, a large variable ball connecting rod assembly, and a small variable ball connecting rod assembly. The large and small variable ball connecting rod assemblies are mounted on the box. The multistage ball track spherical hinge shaft is supported on the multistage ball track bearing ring, and a multistage rolling element holder in which a rolling element is provided is mounted in the multistage ball track spherical hinge shaft. Two ends of the ball connecting rod are hingedly connected to the multistage ball track spherical hinge shaft and the plunger.

A bent axis plunger-type variable hydraulic motor pump, including a cylinder body, a plunger, a ball connecting rod, a plunger spherical hinge, a multistage ball track spherical hinge shaft, a multistage ball track bearing ring, a retainer plate, an oil distributing plate, an oil distributing plate pin shaft, a suspension circle, a bushing bearing ring, a box bushing shaft, a box, a large variable ball connecting rod assembly, and a small variable ball connecting rod assembly. The large and small variable ball connecting rod assemblies are mounted on the box. The multistage ball track spherical hinge shaft is supported on the multistage ball track bearing ring, and a multistage rolling element holder in which a rolling element is provided is mounted in the multistage ball track spherical hinge shaft. Two ends of the ball connecting rod are hingedly connected to the multistage ball track spherical hinge shaft and the plunger.

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 bent-axis hydrostatic axial piston machine (1) has a drive shaft (4) rotatable around an axis of rotation (R.sub.t) and having a drive flange (3). A cylinder drum (7) is rotatable around an axis of rotation (R.sub.z). The cylinder drum (7) includes a plurality of piston bores (8) concentric to the axis of rotation (R.sub.z) of the cylinder drum (7) and in each of which piston bores (8) there is a longitudinally displaceable piston (10). The pistons (10) are fastened in an articulated manner to the drive flange (3). Between the drive shaft (4) and the cylinder drum (7) there is a constant velocity driving joint (30) in the form of a cone-beam semi-roller joint (31).

A hydrostatic axial piston machine defines an adjustable displacement volume and includes a housing, a cylinder drum, a plurality of working pistons, a pivot cradle, and a plain bearing. The working pistons are received in the cylinder drum so as to be axially displaceable, and are supported on a sliding surface of the pivot cradle. The pivot cradle is configured to adjust the displacement volume, and is pivotably mounted on the plain bearing. The plain bearing is fixed with respect to the housing. The hydrostatic axial piston machine is configured to form at least one first hydrostatic relief pressure field between the plain bearing and the pivot cradle.