The subject matter described herein relates to a spin pump that includes a combination of a compressor and a vacuum pump on respective pistons extending from a common crankshaft in a rotating housing. Related methods, apparatuses, systems, techniques and articles are also described.

A radial rotary piston machine comprising a frame (1), at least one opening (13) for inlet of a medium into the machine and at least one opening (14) for discharge of a medium out of the machine, where the frame (1) comprises end plates (11) between which a rotor (2) is placed, this rotor (2) comprises axial opening (21) for a shaft (5) of the machine and further comprises at least two angularly offset piston chambers (22) transversely to the rotor axis, the shaft (5) of the machine extends through the axial opening (21) in the rotor (2) and is mounted in bearings in the end plates (11) of the frame (1), circular cams (51) are arranged on the shaft (5), the shaft (5) being positioned eccentrically to the rotor (2), each piston (4) is arranged for reciprocal movement in the chamber (22) and mounted rotatively on the circular cam (51), where the chamber (22) ends are closed by heads (3), the head (3) or the rotor (2) comprise at least one passage (32) for inlet and discharge of a medium from the chamber (22), which are opened and closed by valve means, where the head (3) and/or the rotor (2) comprise at least one passage (32) for inlet and discharge of a medium to and from the piston chamber (22) leading on one end in axial direction to the end plate (11) of the frame (1), and which is opened and closed at its axial opening by valve means in the form of separate arcuate slots (61).

A radial rotary piston machine comprising a frame (1), at least one opening (13) for inlet of a medium into the machine and at least one opening (14) for discharge of a medium out of the machine, where the frame (1) comprises end plates (11) between which a rotor (2) is placed, this rotor (2) comprises axial opening (21) for a shaft (5) of the machine and further comprises at least two angularly offset piston chambers (22) transversely to the rotor axis, the shaft (5) of the machine extends through the axial opening (21) in the rotor (2) and is mounted in bearings in the end plates (11) of the frame (1), circular cams (51) are arranged on the shaft (5), the shaft (5) being positioned eccentrically to the rotor (2), each piston (4) is arranged for reciprocal movement in the chamber (22) and mounted rotatively on the circular cam (51), where the chamber (22) ends are closed by heads (3), the head (3) or the rotor (2) comprise at least one passage (32) for inlet and discharge of a medium from the chamber (22), which are opened and closed by valve means, where the head (3) and/or the rotor (2) comprise at least one passage (32) for inlet and discharge of a medium to and from the piston chamber (22) leading on one end in axial direction to the end plate (11) of the frame (1), and which is opened and closed at its axial opening by valve means in the form of separate arcuate slots (61).

The subject matter described herein relates to a spin pump that includes a combination of a compressor and a vacuum pump on respective pistons extending from a common crankshaft in a rotating housing. Related methods, apparatuses, systems, techniques and articles are also described.

A connector plate, for mechanically and hydraulically connecting a hydraulic machine with a hydraulic attachment part, includes a plurality of hydrostatic connector recesses. Each recess has a first side that includes a first orifice opening to the hydraulic attachment part, and a second side with a second orifice opening to the hydraulic machine. The plurality of orifices are arranged so as to open in a substantially axially parallel manner with respect to a drive shaft of the hydraulic machine. A hydraulic machine includes such a connector plate, and a hydrostatic unit includes such a hydraulic machine and a hydraulic attachment part.

The pump can have a support having a guide extending around an axis, a radial position of the guide relative the axis varying around the axis, and a first oil passage formed in the support; a rotary assembly mounted to the support via support bearings, and rotatable around the axis, the rotary assembly having a second oil passage and a cylinder, the cylinder extending radially relative the axis, an inlet port fluidly connecting the first oil passage to the cylinder, and an outlet port fluidly connecting the cylinder to the second oil passage, and a piston slidingly mounted in the cylinder, a radially-outer end of the piston further slidingly engaged with the guide.

To provide a radial piston pump capable of displacement control without using an electronic control valve. For achieving the above object, the radial piston pump includes: a first cam circumferentially varying in radius on an inner circumferential side or outer circumferential side of the cam in a continuous manner; a second cam circumferentially varying in radius on an inner circumferential side or outer circumferential side of the cam in a continuous manner; a first operation member operating along a side of the first cam on which the radius of the cam continuously varies; a second operation member operating along a side of the second cam on which the radius of the cam continuously varies; a first piston connected to the first operation member; a second piston connected to the second operation member; a cylinder connecting with the first piston and the second piston and varied in volume by motion of at least one of the first piston and the second piston; and an adjustment unit for rotating at least one of the first cam and the second cam.

The subject matter described herein relates to a spin pump that includes a combination of a compressor and a vacuum pump on respective pistons extending from a common crankshaft in a rotating housing. Related methods, apparatuses, systems, techniques and articles are also described.

The pump can have a support having a guide extending around an axis, a radial position of the guide relative the axis varying around the axis, and a first oil passage formed in the support; a rotary assembly mounted to the support via support bearings, and rotatable around the axis, the rotary assembly having a second oil passage and a cylinder, the cylinder extending radially relative the axis, an inlet port fluidly connecting the first oil passage to the cylinder, and an outlet port fluidly connecting the cylinder to the second oil passage, and a piston slidingly mounted in the cylinder, a radially-outer end of the piston further slidingly engaged with the guide.

The invention relates to a valve assembly (50) of a radial piston hydraulic apparatus (1). Said apparatus includes a cylinder block (4) insertable onto a shaft (2) by translation. Said assembly (50) includes: a valve (51) in contact with said cylinder block (4); a valve train cover (52); and a first (541) and second (542) chamber that are defined, respectively, by a first (511, 521) and second (512, 522) space that are located at the interface between said valve (51) and said valve train cover (52), and are intended for the pressurized fluids that enable the conversion of pressure and/or mechanical stress. Said assembly (50) includes an additional section (54) defined by a third space (541, 542) located at the interface between said valve (51) and said valve train cover (52). Said section (54) is intended for receiving a pressurized fluid such as to enable the cylinder block (4) to be inserted onto the shaft (2).