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US 2016/0319799 A1Published application
Hydraulic radial piston devices
AssigneeEaton Corporation
InventorsJeffrey David SKINNER, JR., Kendrick Michael GIBSON, Mark Alan LONG, William Landrum FAIRCHILDS
Life of this patent
Estimating the term…
Abstract
A radial piston device (100) includes: a housing (102), a pintle (110), a rotor (130), a plurality of pistons (150) and a drive shaft (190). The radial piston device also includes a mechanism for minimizing deflection or curvature of the pintle shaft (112), which may be caused by a resulting pressure applied to the pintle shaft. In one example, the mechanism may be implemented by at least partially supporting the rotor by the housing with a bearing while the rotor is also supported by the pintle shaft with another bearing.
Claims49
A device comprising:
- a housing having a hydraulic fluid inlet and a hydraulic fluid outlet;
- a pintle attached to the housing and having a pintle shaft;
- a rotor rotatably mounted on the pintle shaft and having a plurality of cylinders;
- a plurality of pistons, each being displaceable in each of the plurality of cylinders;
- and
- a drive shaft coupled to the rotor and rotatably supported within the housing,
- wherein the pintle shaft defines a fluid communication between the hydraulic fluid inlet and the plurality of cylinders and a fluid communication between the plurality of cylinders and the hydraulic fluid outlet;
- and
- wherein the rotor is at least partially received within the housing and rotatably supported by the housing with a bearing.
6 more elements
A radial piston device comprising:
- a housing having a hydraulic fluid inlet and a hydraulic fluid outlet;
- a pintle attached to the housing, the pintle including a pintle shaft defining a pintle inlet and a pintle outlet, the pintle inlet being in fluid communication with the hydraulic fluid inlet, the pintle outlet being in fluid communication with the hydraulic fluid outlet;
- a rotor mounted on the pintle shaft, the rotor being configured to rotate relative to the pintle about a rotor axis of rotation that extends through a length of the pintle shaft, the rotor defining a plurality of radially oriented cylinders and a plurality of rotor fluid ports;
- a plurality of pistons, each being displaceable in each of the plurality of radially oriented cylinders, wherein the plurality of rotor fluid ports are in fluid communication with the plurality of radially oriented cylinders, and wherein the plurality of rotor fluid ports are alternately in fluid communication with either the pintle inlet or the pintle outlet as the rotor rotates relative to the pintle about the axis of rotation;
- a thrust ring disposed about the rotor, wherein the thrust ring is in contact with each of the plurality of pistons, and wherein the thrust ring has a thrust ring axis that is radially offset front the rotor axis of rotation so that the plurality of pistons reciprocate radially within the rotor as the rotor rotates about the rotor axis of rotation;
- and
- a drive shaft being coupled to the rotor and rotatably supported within the housing,
- wherein the rotor is supported radially on the pintle shaft with a first bearing, and
- wherein the rotor is at least partially received within the housing and rotatably supported by the housing with a second bearing.
6 more elements
A radial piston device comprising:
- a housing having a hydraulic fluid inlet and a hydraulic fluid outlet;
- a pintle attached to the housing and having a pintle shaft;
- a rotor rotatably mounted on the pintle shaft and having a plurality of cylinders;
- a plurality of pistons, each being displaceable in each of the plurality of cylinders;
- and
- a drive shaft coupled to the rotor and rotatably supported within the housing,
- wherein the pintle shaft defines a fluid communication between the hydraulic fluid inlet and the plurality of cylinders and a fluid communication between the plurality of cylinders and the hydraulic fluid outlet,
- wherein the pintle has an inlet end and an outlet end, the inlet end adjacent to the hydraulic fluid inlet, and the outlet end opposite to the inlet end along a length of the pintle, shaft, and
- wherein the pintle shaft includes a tapered portion arranged around the pintle shaft at the inlet end of the pintle.
6 more elements
A radial piston device comprising:
- a housing having a hydraulic fluid inlet and a hydraulic fluid outlet;
- a pintle attached to the housing and having a pintle shaft;
- a rotor rotatably mounted on the pintle shaft and having a plurality of cylinders;
- a plurality of pistons, each being displaceable in each of the plurality of cylinders;
- and
- a drive shaft configured integrally with the rotor as one piece and rotatably supported within the housing,
- wherein the pintle shaft defines a fluid communication between the hydraulic fluid inlet and the plurality of cylinders and a fluid communication between the plurality of cylinders and the hydraulic fluid outlet.
4 more elements
A radial piston device comprising:
- a housing having a hydraulic fluid inlet and a hydraulic fluid outlet;
- a pintle attached to the housing and having a pintle shaft;
- a rotor rotatably mounted on the pintle shaft and having a plurality of cylinders;
- a plurality of pistons, each being displaceable in each of the plurality of cylinders;
- and
- a drive shaft coupled to the rotor and rotatably supported within the housing,
- wherein the pintle shaft defines a fluid communication between the hydraulic fluid inlet and the plurality of cylinders and a fluid communication between the plurality of cylinders and the hydraulic fluid outlet,
- wherein the pintle shaft is at least partially received and supported by the drive shaft, and
- wherein the drive draft is engaged at least partially with the pintle s a and rotatable with respect to the pintle shaft.
6 more elements
A radial piston device comprising:
- a housing having a hydraulic fluid inlet and a hydraulic fluid outlet;
- a pintle attached to the housing and having a pintle shaft;
- a rotor rotatably mounted on the pintle shaft and having a plurality of cylinders;
- a plurality of pistons, each being displaceable in each of the plurality of cylinders;
- and
- a drive shaft coupled to the rotor and rotatably supported within the housing,
- wherein the pintle shaft defines a fluid communication between the hydraulic fluid inlet and the plurality of cylinders and a fluid communication between the plurality of cylinders and the hydraulic fluid outlet, and
- wherein the drive shaft and the rotor is coupled by spline coupling.
5 more elements
A radial piston device comprising:
- a housing having a hydraulic fluid inlet and a hydraulic fluid outlet:
- a pintle attached to the housing and having a pintle shaft;
- a rotor rotatably mounted on the pintle shaft and having a plurality of cylinders;
- a plurality of pistons, each being displaceable in each of the plurality of cylinders;
- and
- a drive shaft coupled to the rotor and rotatably supported within the housing,
- wherein the pintle shaft defines a fluid communication between the hydraulic fluid inlet and the plurality of cylinders and a fluid communication between the plurality of cylinders and the hydraulic fluid outlet,
- wherein the pintle has an inlet end and an outlet end, the inlet end adjacent to the hydraulic fluid inlet, and the outlet end opposite to the inlet end along a pintle shaft axis, and
- wherein the pintle shaft includes a pre-defined flex location around the pintle shaft adjacent the outlet end of the pintle.
6 more elements
A device comprising:
- a housing having a hydraulic fluid inlet and a hydraulic fluid outlet;
- a pintle attached to the housing and having a pintle shaft, the pintle shaft having a base end and a free end opposite to the base end along a length of the pintle shaft, wherein the base end is fixed with respect to the housing;
- a rotor rotatably mounted on the pintle shaft and having a plurality of cylinders, the rotor at least partially received within the housing adjacent the free end of the pintle shaft;
- a plurality of pistons, each being displaceable in each of the plurality of cylinders;
- a drive shaft rotatably supported within the housing;
- a flexible coupling configured to couple the drive shaft and the rotor;
- a first bearing positioned between the housing and the rotor adjacent the free end of the pintle shaft to rotatably support the rotor against the housing;
- and
- a second bearing positioned between the pintle shaft and the rotor and located no more than half of the length of the pintle shaft from the base end of the pintle shaft, wherein no bearing is provided between the pintle shaft and the rotor at the remaining half of the length of the pintle shaft;
- wherein the pintle shaft defines a fluid communication between the hydraulic fluid inlet and the plurality of cylinders and a fluid communication between the plurality of cylinders and the hydraulic fluid outlet.
7 more elements
Dependencies are inferred from the claim text.