Hydraulic machine

Patent metadata

Field	Value
Publication number	US-11892005-B2
Application number	US-202217832797-A
Country	US
Kind code	B2
Filing date	Jun 6, 2022
Priority date	Sep 16, 2021
Publication date	Feb 6, 2024
Grant date	Feb 6, 2024

Abstract

A hydraulic machine includes a first member (1) having a first structure (2) for a hydraulic medium opening in a first interface surface (3) and a second member having a second structure for the hydraulic medium opening in a second interface surface is described, the first interface surface (3) being in contact with the second interface surface, wherein at least one of the members (1) is provided with a support element (6) surrounding the member (1). Such a machine should have a good efficiency. To this end the support element (6) has a strength varying in circumferential direction around the member (1) and/or in thickness direction in a middle region of the member (1).

First claim

The invention claimed is:

1. A hydraulic machine comprising a first member having a first structure for a hydraulic medium opening in a first interface surface and a second member having a second structure for the hydraulic medium opening in a second interface surface, the first interface surface being in contact with the second interface surface, wherein at least one of the members is provided with a support element surrounding the member, wherein the support element comprises a strength varying in circumferential direction around the member and/or in thickness direction in a middle region of the member, and wherein, when the support element comprises a strength varying in thickness direction, the strength of the support element varies depending on the resistance against deformation of the member in a direction parallel to its interface surface such that in a thickness direction of the support member there are parts of the support member configured to provide a larger resistance against a radial deformation than other parts of the support member in the thickness direction which are configured to provide a smaller resistance against a radial deformation.

2. The hydraulic machine according to claim 1 , wherein the shape of the cross section of the support element varies in circumferential direction around the member and/or in thickness direction in a middle region of the member.

3. The hydraulic machine according to claim 1 , wherein the support element is in form of a compression ring connected to the member with an interference fit, wherein the interference fit varies in circumferential direction around the member and/or in thickness direction in a middle region of the member.

4. The hydraulic machine according to claim 1 , wherein the structure for the hydraulic medium of the member comprises a first asymmetry and the support element comprises a second asymmetry compensating for the first asymmetry.

5. The hydraulic machine according to claim 1 , wherein the member comprises a first outer form and the support element comprises a second outer form, wherein a distance between the first outer form and the second outer form varies in circumferential direction around the member and/or in thickness direction in a middle region of the member.

6. The hydraulic machine according to claim 1 , wherein the support element comprises a contact face adjacent the member, wherein at least a part of the contact face in circumferential direction around the member and/or in thickness direction of the member forms a gap to the member.

7. The hydraulic machine according to claim 1 , wherein the material of the member is different from the material of the support element.

8. The hydraulic machine according to claim 7 , wherein the member is of a ceramic material.

9. The hydraulic machine according to claim 7 , wherein the member is of a plastic material.

10. The hydraulic machine according to claim 7 , wherein the support element is of stainless steel.

11. The hydraulic machine according to claim 1 , wherein the support element is 3D printed.

12. The hydraulic machine according to claim 1 , wherein the coefficient of thermal expansion of the member and of the support element differs no more than 10%.

13. The hydraulic machine according to claim 1 , wherein the support element protrudes at least partly over the member at least in a part of the circumference of the member.

14. The hydraulic machine according to claim 1 , wherein the interface surface is uneven without hydraulic pressure in a high pressure part of the structure for the hydraulic medium and even with hydraulic pressure in the high pressure part of the structure for the hydraulic medium.

15. A hydraulic machine comprising a first member having a first structure for a hydraulic medium opening in a first interface surface and a second member having a second structure for the hydraulic medium opening in a second interface surface, the first interface surface being in contact with the second interface surface, wherein at least one of the members is provided with a support element surrounding the member, and wherein the support element comprises a strength varying in circumferential direction around the member.

16. The hydraulic machine according to claim 15 , wherein the shape of the cross section of the support element varies in circumferential direction around the member.

17. A hydraulic machine comprising a first member having a first structure for a hydraulic medium opening in a first interface surface and a second member having a second structure for the hydraulic medium opening in a second interface surface, the first interface surface being in contact with the second interface surface, wherein at least one of the members is provided with a support element surrounding the member, wherein the support element comprises a strength varying in circumferential direction around the member and in thickness direction in a middle region of the member.

18. The hydraulic machine according to claim 17 , wherein the shape of the cross section of the support element varies in circumferential direction around the member and in thickness direction in a middle region of the member.

19. The hydraulic machine according to claim 17 , wherein the support element is in form of a compression ring connected to the member with an interference fit, wherein the interference fit varies in circumferential direction around the member and in thickness direction in a middle region of the member.

Assignees

• Danfoss As

Inventors

• Andersen Stig Kildegaard
• Hansen Poul Erik
• Babu Achuthan

Classifications

• F04D29/0465 Primary

  Ceramic bearing designs · CPC title

• F04D29/086

  especially adapted for liquid pumps · CPC title

• F16J15/20

  Packing materials therefor · CPC title

• B33Y80/00

  Products made by additive manufacturing · CPC title

• F16K3/08 Primary

  with circular plates rotatable around their centres · CPC title