RADIAL PISTON PUMPS AND MOTORS
First Claim
Patent Images
1. A radial piston pump comprising a rotor, the rotor including a drive shaft arranged to transmit rotary motion to or from the pump and a piston housing including at least one piston chamber, the at least one piston chamber being arranged to receive a piston and wherein the drive shaft and the piston housing are integrally formed.
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Accused Products
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.
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Citations
52 Claims
- 1. A radial piston pump comprising a rotor, the rotor including a drive shaft arranged to transmit rotary motion to or from the pump and a piston housing including at least one piston chamber, the at least one piston chamber being arranged to receive a piston and wherein the drive shaft and the piston housing are integrally formed.
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- 13. A method of manufacturing a radial piston pump, the pump comprising a drive shaft arranged to transmit rotary motion to or from the pump and a piston housing including at least one piston chamber, the piston chamber being arranged to receive a piston, the method comprising the step of forming a rotor including the drive shaft and the piston housing as a single piece using an additive manufacturing process.
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- 17. A radial piston pump comprising at least one piston mounted for reciprocal movement in a piston housing and a cam including a cam surface arranged to control the motion of the at least one piston when the piston housing rotates relative to the cam about a first axis, wherein the cam is mounted for axial movement relative to the piston housing along the first axis and the profile of the cam surface varies across the width of the cam such that moving the cam relative to the piston housing along the first axis changes the motion of the piston.
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28. A method of varying the flow of fluid through a radial piston pump, the piston pump comprising a piston housing including a plurality of pistons mounted therein and a cam surface, each piston being connected to a cam follower arranged to follow the cam surface when the piston housing rotates relative to the cam surface about a first axis, and wherein the profile of the cam surface varies with distance along the first axis, the method comprising the steps of:
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rotating the piston housing relative to the cam surface at a first location such that a first piston motion is produced, rotating the piston housing relative to the cam surface at a second location, spaced apart from the first location along the first axis, such that a second, different, piston motion is produced. - View Dependent Claims (30)
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33. A radial piston pump comprising a primary cam surface, at least one secondary cam surface and at least one piston assembly comprising a first piston, the first piston being mounted for reciprocal movement in a piston housing, said piston housing being arranged to rotate relative to the primary cam surface, the piston assembly further comprising
a primary roller connected to the first piston and arranged to follow the primary cam surface when the piston housing rotates relative to the primary cam surface, and a secondary roller connected to the first piston and arranged to follow a secondary cam surface as the primary roller follows the primary cam surface.
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Specification