Hydraulic machine with chamfered ring

1. A hydraulic device comprising:

a rotor disposed for rotation about an axis, the rotor having a plurality of roller vanes extending therefrom, wherein the each of the plurality of roller vanes have a roller;

a ring disposed at least partially around the rotor, the ring and rotor in communication with a port for egress of a hydraulic fluid from a chamber adjacent the rotor, wherein the chamber is positioned between the rotor and the ring, wherein the ring further defines a cavity adjacent to and in communication with the port, wherein the cavity is positioned radially outward of and in communication with the chamber; and

a rail disposed within the port axial to and adjacent the rotor, wherein the rail has a chamfered surface positioned radially inward of a tip of each of the plurality of roller vanes, and wherein the rail is configured to provide an axial stop for the roller of each of the plurality of roller vanes.

2. The hydraulic device of claim 1 , wherein the hydraulic device comprises a variable vane device.

3. The hydraulic device of claim 1 , wherein the cavity is further defined by the rotor and is configured to allow the hydraulic fluid to be disposed radially outward of at least a portion of the at least one of the plurality of roller vanes when the at least one of the plurality of roller vanes is transiting the port.

4. The hydraulic device of claim 1 , wherein the cavity extends axially along the inner surface of the ring for a distance.

5. The hydraulic device of claim 1 , wherein the cavity extends along an inner circumference of the ring for a distance sufficient to accommodate at least two of the plurality of vanes when the at least two of the plurality of roller vanes are transitioning the port.

6. The hydraulic device of claim 1 , wherein the rail defines one or more passages that allow for a flow of hydraulic fluid through the rail to the port.

7. The hydraulic device of claim 6 , wherein the one or more passages are disposed radially inward of a vane pocket and the roller.

8. The hydraulic device of claim 1 , wherein the rail is formed by a side plate that additionally defines a portion of the port.

9. The hydraulic device of claim 1 , wherein the chamfered surface is positioned radially inward of a majority of each roller.

10. A hydraulic device comprising:

a side plate defining at least a portion of a port and a rail, the rail disposed within the port;

a rotor disposed for rotation about an axis and disposed axial to and adjacent the side plate;

a plurality of roller vanes configured to extend from the rotor, wherein each of the plurality of roller vanes have a roller received in a vane pocket at an outer radial end thereof; and

a ring disposed at least partially around the rotor, the ring and rotor in communication with the port for egress of the hydraulic fluid from a chamber adjacent the rotor, wherein the chamber is positioned between the rotor and the ring, wherein the ring defines a cavity adjacent to and in communication with the port, wherein the cavity is positioned radially outward of and in communication with the chamber and the cavity is disposed radially outward of the plurality of roller vanes;

wherein the rail is positioned axial and adjacent to the rotor, wherein the rail has a chamfered surface positioned radially inward of the outer radial end of each of the plurality of roller vanes, and wherein the rail is configured to provide an axial stop for the roller of each of the roller vanes.

11. The hydraulic device of claim 10 , wherein the hydraulic device comprises a variable vane device.

12. The hydraulic device of claim 10 , wherein the cavity is configured to allow the hydraulic fluid to be disposed radially outward of at least a portion of the at least one of the plurality of roller vanes when the at least one of the plurality of roller vanes is transiting the port.

13. The hydraulic device of claim 10 , wherein the cavity extends axially along the inner surface of the ring for a distance.

14. The hydraulic device of claim 10 , wherein the cavity extends along an inner circumference of the ring for a distance sufficient to accommodate at least two of the plurality of roller vanes when the at least two of the plurality of roller vanes are transitioning the port.

15. The hydraulic device of claim 10 , wherein the rail defines one or more passages that allow for a flow of hydraulic fluid through the rail to the port.

16. The hydraulic device of claim 15 , wherein the one or more passages are disposed radially inward of the vane pocket and the roller.

17. The hydraulic device of claim 10 , wherein the chamfered surface is positioned radially inward of a majority of each roller.

18. A hydraulic device comprising:

a rotor disposed for rotation about an axis;

a plurality of roller vanes configured to extend from the rotor, wherein the plurality of roller vanes have a roller received in a vane pocket at an outer radial end thereof,

a side plate disposed axial to and adjacent the rotor, the side plate defining at least a portion of a port and a rail, wherein the rail disposed within the port axial to and adjacent the rotor, wherein the rail has a chamfered surface positioned radially inward of the outer radial end of each of the plurality of roller vanes, wherein the rail is configured to provide an axial stop for the roller of each of the roller vanes; and

a ring disposed at least partially around the rotor, the ring and rotor in communication with the port for egress of the hydraulic fluid from a chamber adjacent the rotor, wherein the chamber is positioned between the rotor and the ring, wherein the ring defines a cavity adjacent to and in communication with the port, wherein the cavity is positioned radially outward of and in communication with the chamber and the cavity is disposed radially outward of the plurality of roller vanes.

19. The hydraulic device of claim 18 , wherein the chamfered surface is positioned radially inward of a majority of each roller.