A radial piston hydraulic motor comprising a hollow rotating shaft inside the motor, which rotating shaft is arranged to rotate around its axial central axis A for providing torque from the radial piston hydraulic motor, wherein the rotating shaft comprises a piston frame with pistons, which are arranged to move radially, the piston frame comprises a distribution surface, which is a flat surface in parallel plane with the radial movement of the pistons, and a first inner surface extending in axial direction around the axial central axis A, wherein the rotating shaft comprises a half shaft having a second inner surface extending in axial direction around the axial central axis A, wherein piston frame and the half shaft are arranged adjacent to each other so that the first inner surface and the second inner surface form a surface, in axial direction, forming a cavity inside the rotating shaft for receiving a drive shaft.

A fluid pump includes a cam plate that defines an interior cam surface having an eccentric portion and a narrow portion. A hub rotates within the interior cam surface and has a piston cavity that is in communication with an inlet port and an outlet port. A piston member is operably received within the piston cavity to define a suction phase within the eccentric portion and a pressure phase within the narrowed portion. The piston member is biased outward by rotational operation of the hub. During the suction phase, the piston member is biased away from the piston cavity to define a flow cavity that draws fluid from the inlet port. During the pressure phase, the piston member is biased by the narrowed portion into the flow cavity to push the fluid from the flow cavity toward the outlet port.

A fluid pump includes a cam plate that defines an interior cam surface having an eccentric portion and a narrow portion. A hub rotates within the interior cam surface and has a piston cavity that is in communication with an inlet port and an outlet port. A piston member is operably received within the piston cavity to define a suction phase within the eccentric portion and a pressure phase within the narrowed portion. The piston member is biased outward by rotational operation of the hub. During the suction phase, the piston member is biased away from the piston cavity to define a flow cavity that draws fluid from the inlet port. During the pressure phase, the piston member is biased by the narrowed portion into the flow cavity to push the fluid from the flow cavity toward the outlet port.

The invention relates to a radial reciprocating engine (1) having cylinders (5) arranged in a cylinder carrier (16) and a piston element (21) arranged in each cylinder (5) that is connected to a guide element (22), wherein the guide element (22) runs on a slide surface (14), whereby a stroke movement is imposed on the piston element (21). Since the piston element (21) is spherical at least in the region of the piston element (21) which seals the inner walls (51) of the cylinder (5) during the stroke movements, a linear seal is created, which enables a more compact design in comparison to radial pumps with cylindrical piston elements.

The invention relates to a radial reciprocating engine (1) having cylinders (5) arranged in a cylinder carrier (16) and a piston element (21) arranged in each cylinder (5) that is connected to a guide element (22), wherein the guide element (22) runs on a slide surface (14), whereby a stroke movement is imposed on the piston element (21). Since the piston element (21) is spherical at least in the region of the piston element (21) which seals the inner walls (51) of the cylinder (5) during the stroke movements, a linear seal is created, which enables a more compact design in comparison to radial pumps with cylindrical piston elements.

Pump unit (10) comprising an electrically driven hydraulic pump (4) for pressurising a hydraulic actuating system. The pump unit (10) comprises a hydraulic pump (4) in pump chamber (110) of a pump housing (11). The pump (4) is driven by an electric motor (3) which includes a motor rotor body (310) and an assembly of field coils (32) and magnets (33). A clearance (C) is provided around the motor rotor body (310) which is diverging in the axial direction from a small to a large diameter, such that a rotation of the motor rotor body (310) forces hydraulic fluid to flow towards the larger diameter. The fluid outlet (122) at the larger diameter of the clearance allows an exit of the hydraulic fluid, such that a fluid flow is generated which reduces hydraulic friction inside the pump unit to render an increase in pump capacity.

The rotating hydraulic machine (102) comprises: —a housing (10), —a shaft (20) movably mounted relative to the housing about an axis, —an apron (24) rigidly connected to the shaft and extending around at least a portion of the housing, —a cam (12) rigidly connected to either the housing or the shaft, —a cylinder block (42) rotationally connected to the other of either the housing or the shaft, the cylinder block comprising pistons capable of engaging with the cam to produce a relative rotation between the shaft and the housing, —first and second guide bearings (28) each bearing directly on the housing and the apron, and —at least a third guide bearing (37) bearing directly on the housing and the cylinder block.

The rotating hydraulic machine (102) comprises: —a housing (10), —a shaft (20) movably mounted relative to the housing about an axis, —an apron (24) rigidly connected to the shaft and extending around at least a portion of the housing, —a cam (12) rigidly connected to either the housing or the shaft, —a cylinder block (42) rotationally connected to the other of either the housing or the shaft, the cylinder block comprising pistons capable of engaging with the cam to produce a relative rotation between the shaft and the housing, —first and second guide bearings (28) each bearing directly on the housing and the apron, and —at least a third guide bearing (37) bearing directly on the housing and the cylinder block.

A hydrostatic radial piston machine includes a radial cylinder block with cylinder bores which extend from an outer circumferential surface of the radial cylinder block into an interior of the radial cylinder block; a number of pistons which corresponds to the number of cylinder bores; a cam ring, and ends of the pistons which face away from the radial cylinder piston block are supported movably on an inner circumferential surface of the radial cylinder block during a rotation of the radial cylinder block; two control plate elements which extend respectively with a face oriented towards the radial cylinder block towards a central plane of the radial cylinder block, which central plane is perpendicular to the rotation axis. Each control plate element includes a bearing portion in which radially acting forces are transferable to a respective mating surface in the housing or housing cover mounted in the housing.

A radial piston machine includes a rotor within a housing that is rotatable about an axis, a shaft coupled to the rotor, a distributor which surrounds the shaft and cannot rotate with the rotor and that contacts the rotor in an axial direction, a plurality of brake discs including first brake discs and second brake discs arranged side-by-side along the axis, wherein the first brake discs are coupled to the housing for torque transmission, and the second brake discs are coupled to the shaft for torque transmission, and an actuator configured to releasably exert a brake force in the axial direction on the brake discs. The distributor is located axially between the rotor and the actuator, and the brake discs are located axially between the distributor and the actuator. When the brake force is exerted the brake force is supported by the distributor in the axial direction.