Valve plate assembly

Patent metadata

Field	Value
Publication number	US-11555488-B2
Application number	US-202017039210-A
Country	US
Kind code	B2
Filing date	Sep 30, 2020
Priority date	Dec 19, 2019
Publication date	Jan 17, 2023
Grant date	Jan 17, 2023

Abstract

A valve plate assembly ( 1 ) of a hydraulic axial piston machine is described, the valve plate assembly comprising a wear plate ( 2 ) made of a ceramic material surrounded by a compression ring ( 4 ). Such a valve plate assembly should be produced and maintained in a cost-effective manner. To this end, the wear plate ( 2 ) is connected to a support plate ( 3 ) by means of the compression ring ( 4 ).

First claim

The invention claimed is:

1. A valve plate assembly of a hydraulic axial piston machine, the valve plate assembly comprising a wear plate made of a ceramic material surrounded by a compression ring, wherein the wear plate is fixed to a support plate only by means of the compression ring, and wherein the valve plate assembly is configured to rotate with a cylinder block of the hydraulic axial piston machine.

2. The valve plate assembly according to claim 1 , wherein the compression ring is fixed to the support plate by screws or bolts.

3. The valve plate assembly according to claim 1 , wherein the support plate comprises an elastically deformable spring section.

4. The valve plate assembly according to claim 3 , wherein the elastically deformable spring section is machined out of the support plate.

5. The valve plate assembly according to claim 1 , wherein the compression ring comprises a fixation geometry accommodating fixing means connecting the compression ring to the support plate.

6. The valve plate assembly according to claim 5 , wherein thrust pads are fixed in the support plate on a side opposite to the wear plate, wherein the thrust pads end in the support plate.

7. The valve plate assembly according to claim 5 , wherein the support plate comprises a number of first openings and the wear plate comprises a number of second openings, wherein a form of each first opening of the number of first openings differs from a form of each second opening of the number of second openings.

8. The valve plate assembly according to claim 5 , wherein the support plate comprises an elastically deformable spring section.

9. The valve plate assembly according to claim 5 , wherein the fixation geometry is a threaded hole and wherein the fixation means is a screw or a bolt.

10. The valve plate assembly according to claim 1 , wherein thrust pads are fixed in the support plate on a side opposite to the wear plate, wherein the thrust pads end in the support plate.

11. The valve plate assembly according to claim 10 , wherein the support plate comprises a number of first openings and the wear plate comprises a number of second openings, wherein a form of each first opening of the number of first openings differs from a form of each second opening of the number of second openings.

12. The valve plate assembly according to claim 10 , wherein the support plate comprises an elastically deformable spring section.

13. The valve plate assembly according to claim 10 , wherein the thrust pads abut against a stop surface in the support plate.

14. The valve plate assembly according to claim 13 , wherein the support plate comprises a number of first openings and the wear plate comprises a number of second openings, wherein a form of each first opening of the number of first openings differs from a form of each second opening of the number of second openings.

15. The valve plate assembly according to claim 1 , wherein the support plate comprises a number of first openings and the wear plate comprises a number of second openings, wherein a form of each first opening of the number of first openings differs from a form of each second opening of the number of second openings.

16. The valve plate assembly according to claim 15 , wherein each first opening of the number of first openings has a cross section which changes in an axial direction of the support plate and each second opening of the number of second openings has a constant cross section.

17. The valve plate assembly according to claim 16 , wherein sealing means are arranged between the support plate and the wear plate.

18. The valve plate assembly according to claim 15 , wherein sealing means are arranged between the support plate and the wear plate.

19. The valve plate assembly according to claim 18 , wherein each of the sealing means is arranged in a groove surrounding a first opening of the number of first openings, wherein an area limited by each of the sealing means is of non-circular form.

20. The valve plate assembly according to claim 19 , wherein the area limited by each of the sealing means is smaller than an area defined by a thrust pad on an opposite side of the support plate.

Assignees

• Danfoss As

Inventors

• Andersen Stig Kildegaard
• Iversen Frank Holm

Classifications

• F04B1/2021 Primary

  characterised by the contact area between cylinder barrel and valve plate · CPC title

• F04B1/2035

  Cylinder barrels · CPC title

• F04B1/122

  Details or component parts, e.g. valves, sealings or lubrication means (for machines or pumps having rotary cylinder blocks F04B1/2014) · CPC title

• F04B1/20

  having rotary cylinder block · CPC title

• F01B3/0055

  Valve means, e.g. valve plate · CPC title