Hydraulic radial piston device
AssigneeEaton Intelligent Power Limited
InventorsAaron Smith, Sushant Subhash Bawdhankar, Aaron Matthew Davis, Jeffrey David Skinner, Kendrick Michael Gibson, Mark Alan Long, Nicholas John Hansen, Kendall Otis Lee
Life of this patent
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Abstract
A hydraulic radial piston device includes a housing, a pintle having a pintle shaft, a rotor mounted on the pintle shaft and defining a plurality of cylinders, and a plurality of pistons displaceable in the cylinders. The radial piston device further includes a piston ring that provides an interface for the pistons. The radial piston device includes various configurations for improving the performance and efficiency of the device.
Claims17
A hydraulic radial piston device comprising:
- a housing;
- a pintle attached to the housing and having a pintle shaft;
- a rotor mounted on the pintle shaft and configured to rotate relative to the pintle shaft about a rotor axis of rotation, the rotor having a plurality of cylinders;
- a plurality of pistons, each being displaceable in each of the plurality of cylinders;
- a piston ring disposed around the rotor and having a piston ring axis of rotation, the piston ring configured to rotate about the piston ring axis of rotation as the rotor rotates relative to the pintle shaft about the rotor axis of rotation;
- and
- a drive shaft rotatably supported within the housing and rotatable with the rotor,
- wherein the piston ring has an inner diameter and an outer diameter, the inner diameter and the outer diameter axially extending between opposite axial end faces, the inner diameter having a V-shape configuration with a first radius measured around the piston ring axis of rotation at a fillet point of the piston ring and a second radius measured around the piston ring axis of rotation at the axial end faces, the first radius being greater than the second radius.
A hydraulic radial piston device comprising:
- a housing;
- a pintle attached to the housing and having a pintle shaft, the pintle having a fluid inlet end and an opposite fluid outlet end;
- a rotor mounted on the pintle shaft and configured to rotate relative to the pintle shaft about a rotor axis of rotation, the rotor having a plurality of cylinders;
- a plurality of pistons, each being displaceable in each of the plurality of cylinders;
- a piston ring disposed around the rotor and having a piston ring axis of rotation, the piston ring configured to rotate about the piston ring axis of rotation as the rotor rotates relative to the pintle shaft about the rotor axis of rotation;
- and
- a drive shaft rotatably supported within the housing and rotatable with the rotor;
- wherein the pintle includes an integrated bearing surface for supporting rotation of the rotor either directly or by an intermediate fluid, the integrated bearing surface integrally formed to surround a rotor inlet communication port and a rotor outlet communication port, the rotor inlet communication port formed on the pintle shaft and configured to be selectively in fluid communication with the plurality of cylinders, and the rotor outlet communication port formed on the pintle shaft and configured to be selectively in fluid communication with the plurality of cylinders;
- and
- wherein the piston ring has an inner diameter and an outer diameter, the inner diameter and the outer diameter axially extending between opposite axial end faces, the inner diameter having a V-shape configuration with a first radius measured around the piston ring axis of rotation at a fillet point of the piston ring and a second radius measured around the piston ring axis of rotation at the axial end faces, the first radius being greater than the second radius.
Dependencies are inferred from the claim text.