Hydraulic motor

Patent metadata

Field	Value
Publication number	US-9784107-B2
Application number	US-201314060363-A
Country	US
Kind code	B2
Filing date	Oct 22, 2013
Priority date	Oct 22, 2012
Publication date	Oct 10, 2017
Grant date	Oct 10, 2017

Abstract

A hydraulic geroller (gerotor) motor, wherein an inner rotor of a revolving group has a plurality of lobes circumferentially spaced along an outer periphery of the inner rotor, and an orbiter of the revolving group includes an orbiting ring and rounded vane portions preferably formed by roller vanes contained in inner recesses of the orbiting ring for common orbiting with the orbiting ring about the fixed longitudinal axis. The orbiter also has fixed for orbiting therewith, fluid windows for directing fluid from the fluid ports to the revolving group. The windows may be formed in an integral portion of the orbiter or in a valve plate mounted for common orbiting with the orbiting orbiter. The valve plate cooperates with a stationary commutator plate or assembly to provide an efficient arrangement for the delivery and exhaust of hydraulic pressure fluid to and from the hydraulic motor.

First claim

What is claimed is:

1. A hydraulic motor comprising:
a motor housing having a fluid inlet and a fluid outlet;
an output shaft mounted within the motor housing for rotation about a fixed longitudinal axis; and
a revolving group for revolving in respect to the fixed longitudinal axis, the revolving group including:
an inner rotor mounted on the output shaft, the inner rotor having a plurality of lobes circumferentially spaced along an outer periphery of the inner rotor;
an orbiting ring surrounding the inner rotor, the orbiting ring having a plurality of inner recesses circumferentially spaced along an inner periphery of the orbiting ring;
a plurality of roller vanes disposed between the inner rotor and the orbiting ring, the roller vanes being received in the inner recesses for common orbiting with the orbiting ring about the fixed longitudinal axis, wherein the orbiting ring and roller vanes orbit about the inner rotor and in respect to the fixed longitudinal axis; and
a valve plate integral with the orbiting ring, the valve plate having a plurality of fluid windows for enabling fluid communication between the fluid inlet and outlet and the revolving group.

2. The hydraulic motor according to claim 1 , further comprising a commutator assembly coupled to the motor housing, the commutator assembly including a plurality of commutator plates each having a plurality of apertures forming inlet and outlet ports for enabling fluid communication between the fluid inlet and outlet and the valve plate.

3. The hydraulic motor according to claim 1 , wherein the lobes and the roller vanes interengage to define a plurality of expanding and contracting volume chambers, and wherein rotation of the inner rotor causes the volume chambers to change volume.

4. The hydraulic motor according to claim 1 , further comprising:
a commutator plate mounted to the housing, the commutator plate in fluid communication with the fluid inlet and outlet; and
a valve plate configured to orbit with the orbiting ring,
wherein the valve plate includes fluid windows that align with the inlet and outlet ports in the commutator plate to cause the volume chambers to expand and contract.

5. The hydraulic motor according to claim 1 , wherein the orbiting ring has a plurality of outer recesses circumferentially spaced along an outer periphery of the orbiting ring, and wherein each outer recess interengages with a radially-extending protrusion spaced circumferentially about an inner periphery of the motor housing to constrain the orbiting ring from rotating.

6. The hydraulic motor of claim 5 , wherein the radially-extending protrusion is a motor bolt extending into the motor housing and located between an inner periphery of the motor housing and the outer periphery of the orbiting ring.

7. The hydraulic motor according to claim 1 , wherein the inner periphery of the orbiting ring is cylindrical.

8. The hydraulic motor according to claim 1 , wherein the roller vanes are cylindrical, and wherein the outer periphery of the inner rotor is trochoidal for maintaining contact with the cylindrical roller vanes.

9. The hydraulic motor according to claim 1 , wherein the inlet and outlet are disposed at the same axial side of the revolving group.

10. The hydraulic motor according to claim 1 , wherein each window of the plurality of fluid windows extends fully axially through the valve plate along the fixed longitudinal axis.

11. A hydraulic motor comprising:
a motor housing; and
a revolving group for revolving in respect to the motor housing, the revolving group including:
an inner rotor for rotating in respect to the motor housing, the inner rotor having a plurality of lobes circumferentially spaced along an outer periphery of the inner rotor; and
an orbiter surrounding the inner rotor, the orbiter having a plurality of radially-extending rounded portions circumferentially spaced along an inner periphery of the orbiter, and the orbiter having a plurality of radially outwardly extending fluid windows,
wherein the orbiter orbits around the inner rotor in respect to the motor housing, and the lobes glide against the radially-extending rounded portions to define a plurality of volume chambers,
wherein the orbiter has fixed for movement therewith the plurality of radially outwardly extending fluid windows aligned with the plurality of volume chambers, and
wherein spacing between the plurality of radially outwardly extending fluid windows and the plurality of radially-extending rounded portions remains constant during rotation of the inner rotor and orbiting of the orbiter, thereby preventing direct fluid communication between the volume chambers.

12. The hydraulic motor according to claim 11 , further comprising a valve plate mounted to the orbiter and having the plurality of fluid windows, wherein a longitudinal center axis of each of the valve plate and the orbiter follow the same path in orbiting about a fixed longitudinal center axis of the inner rotor, thereby preventing alignment of each fluid window with more than one volume chamber at a time.

13. The hydraulic motor according to claim 11 , wherein the lobes and the radially-extending rounded portions glide against one another and interengage at shifting contact points between the lobes and the radially-extending rounded portions, and wherein no shifting contact point passes over a fluid window in the valve plate.

14. The hydraulic motor according to claim 11 , wherein the orbiter includes:
an orbiting ring surrounding the inner rotor, the orbiting ring having a plurality of inner recesses circumferentially spaced along an inner periphery of the orbiting ring; and
a plurality of roller vanes disposed between the inner rotor and the orbiting ring, the roller vanes being received in the inner recesses and forming the radially-extending rounded portions of the orbiter.

15. The hydraulic motor according to claim 11 , further comprising a plurality of motor bolts located between an inner periphery of the motor housing and an outer periphery of the orbiter, wherein the motor bolts constrain the orbiter from rotating.

16. The hydraulic motor according to claim 11 , wherein the radially-extending rounded portions circumferentially spaced along the inner periphery of the orbiter are semi-cylindrical portions, and wherein the inner rotor has a trochoidal outer periphery for remaining in continuous contact with the semi-cylindrical portions of the orbiter.

17. The hydraulic motor according to claim 11 , wherein each window of the plurality of radially outwardly extending fluid windows communicates with each of an inlet and an outlet of the motor housing, and wherein the inlet and outlet are disposed at the same axial side of the orbiter.

18. The hydraulic motor according to claim 11 , wherein each window of the plurality of radially outwardly extending fluid windows in combination with a respective volume chamber defines a respective linear passage fully axially through the orbiter along a fixed longitudinal center axis of the motor housing about which the inner rotor rotates.

19. A method of utilizing pressurized fluid to produce rotary motion comprising the steps of:
injecting fluid into a motor housing and directing the fluid through a plurality of fluid ports in a commutator assembly coupled to the motor housing;
selectively transmitting the fluid through fluid windows of a revolving valve, the revolving valve further including N rotor lobes on an inner rotor for rotating about a fixed longitudinal axis and for interengaging with N+1

Assignees

• Parker Hannifin Corp

Inventors

• Gilbert Kenneth T

Classifications

• F04C2/105

  Details concerning timing or distribution valves · CPC title

• F04C2/086

  Carter · CPC title

• F04C2/103

  one member having simultaneously a rotational movement about its own axis and an orbital movement · CPC title

• F04C2/10

  of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member · CPC title

• F01C1/10 Primary

  of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member · CPC title