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Radial piston pumps and motors

Inactive Publication Date: 2018-07-19
BLAGDON ACTUATION RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides a radial piston pump with a rotor and piston housing that are integrally formed, which makes the pump more compact and reduces manufacturing and assembly costs. The pump may also have a main housing with a cam surface that controls the movement of the piston when in use. This integration of functions makes the design more efficient and cost-effective.

Problems solved by technology

The interaction forces may act against the rotary motion of the pump thereby reducing the efficiency of the pump.
The interaction forces may reduce the life time of the piston and / or necessitate the introduction of bearings at the centre of the pump to manage the forces between the piston housing and the drive shaft and / or main housing of the pump.
The use of hydrostatic lubrication may lead to significant inefficiencies in the pump due to the need to provide a supply of pressurised fluid.
Pumps in accordance with FIG. 1 also comprise a high number of individual components which may lead to wasted space (and therefore larger pumps) or additional cost due to, for example, more complex assembly.

Method used

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  • Radial piston pumps and motors
  • Radial piston pumps and motors
  • Radial piston pumps and motors

Examples

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Embodiment Construction

[0117]FIG. 2 shows a cross-sectional schematic view of a pump 101 in accordance with a first example embodiment of the invention. The pump 101 comprises a rotor 103 including an integrally formed drive shaft 105 and piston housing 102. The piston housing 102 comprises a plurality of radially extending tube-like walls 102a that appear rectangular when viewed in cross-section in FIG. 2 and which project from the outer surface of the rotor 103. Each cylindrical wall 102a is spaced apart from the other cylindrical walls 102a and defines a piston chamber 104 in which a piston 108 is received. The piston chamber walls 102a (and the corresponding pistons 108) are arranged in two rows, each row extending around the circumference of the rotor 103. The two rows are spaced apart along the longitudinal axis of the rotor 103, labelled A in FIG. 2. In the cross-sectional view of FIG. 2, four pistons 108 can be seen; one pair of pistons 108 on either side (upper and lower) of the rotor 103. The tw...

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PUM

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Abstract

A radial piston pump 101 comprising a rotor 103 is disclosed. The rotor 103 includes a drive shaft 105 arranged to transmit rotary motion to or from the pump 101 and a piston housing 102 including at least one piston chamber 104, the at least one piston chamber 104 being arranged to receive a piston 108. The drive shaft 105 and the piston housing 102 are integrally formed.

Description

FIELD OF THE INVENTION[0001]The present invention concerns radial piston pumps. More particularly, but not exclusively, this invention concerns internally impinged radial piston pumps. This invention also concerns piston pumps having a rotor including an integrally formed piston housing and drive shaft. This invention also concerns a variable displacement pump having a cam including a cam surface that varies across the width of the cam such that axial movement of the cam relative to the piston housing changes the motion of the piston. This invention also concerns piston pumps having a primary roller arranged to follow a primary cam surface and a secondary roller arranged to follow a secondary cam surface. This invention also concerns piston pumps produced using additive manufacturing processes, for example 3D printing. It will be appreciated that pumps in accordance with the present invention may also function as motors.BACKGROUND OF THE INVENTION[0002]Radial piston pumps (and / or mo...

Claims

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Application Information

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IPC IPC(8): F04B1/04F04B1/047F04B1/07F04B49/00F04B49/12F04B49/20F04B53/16
CPCF04B1/0439F04B1/0413F04B1/0472F04B1/07F04B49/002F04B49/125F04B49/20F04B53/16F03C1/0409F03C1/0415F03C1/0438F03C1/0472F03C1/0476F04B1/0421F04B1/0456F04B1/066F04B1/1071F04B1/1077
Inventor COLLINS, ANDREW JOHN
Owner BLAGDON ACTUATION RES