Vane pump

Patent metadata

Field	Value
Publication number	US-10047606-B2
Application number	US-201514804969-A
Country	US
Kind code	B2
Filing date	Jul 21, 2015
Priority date	Jul 21, 2015
Publication date	Aug 14, 2018
Grant date	Aug 14, 2018

Abstract

A vane pump is disclosed that includes a plurality of vanes and radial slots configured to provide a gap between the vane and the radial slot such that the vane has a different angular position relative to the direction of rotation in a radially extended position compared to an angular position in a radially-retracted position. The different angular positions provide different orientation of the arcuate surface of the vane tip portion with respect to the cam body inner surface, thus providing different fluid stop points on the vane tip portion arcuate surface.

First claim

The invention claimed is:

1. A vane pump, comprising
a housing including an inlet port and an outlet port;
a cam block having a continuous inner surface including a pump arc and a seal arc;
a rotor configured to rotate within the cam block, said rotor including a plurality of radial slots;
a plurality of radially-extendable vanes that radially extend from the slots as they rotate past the cam block pump arc and retract as they rotate past the cam block seal arc, each of the vanes comprising a radial portion in one of the radial slots and a tip portion extending transverse to the radial portion in a direction of rotation of the rotor, said tip portion including an arcuate surface that engages with the cam block inner surface to provide a fluid seal point along the arcuate surface;
wherein the radial slots have a leading edge along a plane coincident with an axis of rotation of the rotor and a trailing edge at an angle with respect to the leading edge, and each of the plurality of vanes and radial slots are configured to provide a gap between the vane and the radial slot such that the vane has a different angular position relative to the direction of rotation in a radially extended position compared to a radially-retracted position, thereby providing different fluid stop points on the vane tip portion arcuate surface.

2. The vane pump of claim 1 , wherein the fluid seal point of the vane in the radially extended position is offset in the direction of rotation relative to a leading surface of the vane radial portion.

3. The vane pump of claim 1 , wherein the fluid seal point of the vane in the radially retracted position is not offset with respect to the direction of rotation relative to a leading surface of the vane radial portion.

4. The vane pump of claim 1 , wherein the fluid seal point of the vane in the radially retracted position is offset away from the direction of rotation relative to a leading surface of the vane radial portion.

5. The vane pump of claim 1 , wherein the arcuate surface of the vane tip portion has a center line that is offset in the direction of rotation relative to a leading surface of the vane radial portion.

6. The vane pump of claim 1 , wherein the arcuate surface of the vane tip portion has a center line that is not offset with respect to the direction of rotation relative to a leading surface of the vane radial portion.

7. The vane pump of claim 1 , wherein the arcuate surface of the vane tip portion has a center line that is away from the direction of rotation relative to a leading surface of the vane radial portion.

8. The vane pump of claim 1 , wherein the vane has a rotational angular range of motion in the slot in a fully extended position of 0.1° to 2.0°.

9. The vane pump of claim 1 , wherein the gap between the vane and the radial slot is an angular gap having a fixed angle.

10. The vane pump of claim 9 , wherein the angular gap has an angle in the direction of rotation of 0.1° to 2°.

11. The vane pump of claim 1 , wherein the radial slot trailing edge is disposed at a fixed angle to the leading edge.

12. The vane pump of claim 11 , wherein the fixed angle is from 0.1° to 2.0°.

13. The vane pump of claim 1 , further comprising a vent connecting a cavity under the vane to a surface of the rotor on a trailing side of the vane.

14. The vane pump of claim 1 , wherein the vane pump does not include under-vane pressurization.

Assignees

• Hamilton Sundstrand Corp

Inventors

• Wetch Joseph
• Ni Weishun
• Goy Edward W

Classifications

• F01C21/0836 Primary

  comprising guiding means, e.g. cams, rollers · CPC title

• F04C18/24

  of counter-engagement type, i.e. the movement of co-operating members at the points of engagement being in opposite directions · CPC title

• F04C2/3446

  the inner and outer member being in contact along more than one line or surface · CPC title

• F01C21/0863 Primary

  the fluid being the working fluid · CPC title