Sealing ring for hydraulic pump distributor

Patent metadata

Field	Value
Publication number	US-9784268-B2
Application number	US-201414491077-A
Country	US
Kind code	B2
Filing date	Sep 19, 2014
Priority date	Sep 25, 2013
Publication date	Oct 10, 2017
Grant date	Oct 10, 2017

Abstract

A hydraulic pump distributor sealing ring for a hydraulic distributor of a hydraulic pump, includes a continuous sealing ring housed in a ring groove formed in a pump stator whose inlet-delivery ports are each aligned with a distribution opening passing right through the ring in the direction of its thickness, this ring including a circumferential-contact boss which has a circumferential line of contact that can come into contact with a rotor-side low-pressure sealing surface, the ring also including a compression-decompression track, a ring sealing lip that provides sealing between the ring and the ring groove, and rotation-proofing elements.

First claim

The invention claimed is:

1. A sealing ring for a hydraulic pump distributor, comprising:
at least one continuous sealing ring housed with a small amount of axial and/or radial clearance in a ring groove formed in a pump stator inside a surface area delimited by a stator-side low-pressure sealing surface, said at least one continuous sealing ring having a stator-side ring face housed inside a ring groove, and a rotor-side ring face flush with the stator-side low-pressure sealing surface, and two inlet-delivery ports open onto said sealing surface via said ring groove, said at least one continuous sealing ring being axially or radially wider than said inlet delivery ports so as to cover said inlet delivery ports and comprising, approximately in axial or radial alignment therewith, at least one distribution opening passing right through the at least one continuous sealing ring in a direction of its thickness direction, said at least one distribution opening being able to place one of the two inlet-delivery ports in communication with a feed orifice when the feed orifice is approximately facing said one of the two inlet-delivery ports;
at least one circumferential-contact boss formed axially or radially on each side of the at least one distribution opening, said boss having a circumferential line of contact that can come into contact with a rotor-side low-pressure sealing surface;
at least one compression-decompression track formed on an angular sector of the rotor-side ring face, said angular sector being positioned outside of a part of said rotor-side ring face in which the at least one distribution opening is situated;
at least one ring sealing lip that may or may not be secured to the at least one continuous sealing ring and that performs axial or radial sealing between said at least one continuous sealing ring and the ring groove;
at least one compression-decompression sealing gasket which performs sealing between the stator-side ring face and bottom and/or the axial or radial sides of the ring groove and does so in an angular area defined by an angular sector over which a compression-decompression track is formed; and
rotation-proofing means which keep the at least one continuous sealing ring in a fixed angular position in relation to the pump stator.

2. The sealing ring for a hydraulic pump distributor according to claim 1 , wherein the ring groove comprises a ring bearing face on the sides of the ring groove which are oriented at right angles to the stator-side low-pressure sealing surface, said ring bearing face collaborating with a ring bearing shoulder that the at least one continuous sealing ring comprises.

3. The sealing ring for a hydraulic pump distributor according to claim 1 , wherein the ring groove comprises a ring sealing face sides of the ring groove which are oriented at right angles to the stator-side low-pressure sealing surface, said ring sealing face collaborating with a ring sealing shoulder that the at least one continuous sealing ring comprises.

4. The sealing ring for a hydraulic pump distributor according to claim 3 , wherein the at least one ring sealing lip is a flexible metal blade secured to the ring sealing shoulder.

5. The sealing ring for a hydraulic pump distributor according to claim 3 , wherein the at least one ring sealing lip is positioned on, under or in the continuation of the ring sealing shoulder.

6. The sealing ring for a hydraulic pump distributor according to claim 1 , wherein the at least one ring sealing lip comprises a lateral sealing gasket made of a flexible material kept simultaneously in contact with the ring groove and with the stator side ring face.

7. The sealing ring for a hydraulic pump distributor according to claim 1 , wherein the at least one compression-decompression sealing gasket has at least one sectorial compression-decompression cell cavity which, with the stator side ring face and bottom and/or axial or radial sides of the ring groove, defines a closed and sealed volume.

8. The sealing ring for a hydraulic pump distributor according to claim 7 , wherein the at least one compression-decompression sealing gasket comprises a stiffening cellular structure in which a sectorial compression-decompression cell cavity is formed, said cellular structure being produced in a rigid material and being able to be kept in position in relation to the at least one continuous sealing ring directly or indirectly using the rotation-proofing means, whereas said rigid material may be coated completely or partially with a flexible material that can come into contact with the stator-side ring face, and/or with the bottom and/or the axial or radial sides of the ring groove.

9. The sealing ring for a hydraulic pump distributor according to claim 8 , wherein the stiffening cellular structure is incorporated into the stator-side ring face and is made from the same piece of material as the at least one continuous sealing ring.

10. The sealing ring for a hydraulic pump distributor according to claim 7 , wherein the compression-decompression track has at least one sectorial compression-decompression orifice via which a sectorial compression-decompression duct opens, the sectorial compression-decompression duct connecting the closed and sealed volume defined by the sectorial compression-decompression cell cavity with the rotor-side ring face, said at least one sectorial orifice being positioned in such a way that the feed orifice finds itself facing said at least one sectorial orifice once per revolution of a pump rotor, said at least one sectorial orifice then connecting a feed duct to said sealed volume via the sectorial compression-decompression duct.

11. The sealing ring for a hydraulic pump distributor according to claim 6 , wherein the lateral sealing gasket and the at least one compression-decompression sealing gasket form one single component.

12. The sealing ring for a hydraulic pump distributor according to claim 3 , wherein the ring sealing face is positioned approximately plumb with a circumferential line of contact.

13. The sealing ring for a hydraulic pump distributor according to claim 3 , wherein the ring groove comprises a ring bearing face on sides of the ring groove which are oriented at right angles to the stator-side low-pressure sealing surface, the bearing face collaborating with a ring bearing shoulder that the at least one continuous sealing ring comprises, and the ring sealing face is positioned approximately plumb with the circumferential line of contact whereas the ring bearing face is further away from the bottom of the ring groove and the distribution opening than said sealing face so that it is offset out of plumb with the circumferential line of contact.

14. The sealing ring for a hydraulic pump distributor according to claim 1 , wherein at least one of axial faces of the ring groove is formed by the axial face of a ring mounting band that fits closely around the pump stator.

15. The sealing ring for a hydraulic pump distributor according to claim 1 , wherein at least one pump stator distribution face and at least one pump rotor feed face are cylindrical whereas at least one of the inlet-delivery ports collaborates with at least one radial-load compensating port formed in the pump stator, the at least one radial-load compensating port opening from at least one pump stator distribution face and facing the at least one pump rotor feed face, said at least one radial-load compensating port also being situated—within said pump stator—diametrically opposite the inlet-delivery ports with which said pump stator collaborates and being connected by a radial-load compensating d

Assignees

• Rabhi Vianney

Inventors

• Rabhi Vianney

Classifications

• F04B53/143 Primary

  Sealing provided on the piston · CPC title