Integrated pressure plate and port plate for pump

Patent metadata

Field	Value
Publication number	US-10422335-B2
Application number	US-201515315245-A
Country	US
Kind code	B2
Filing date	May 27, 2015
Priority date	May 30, 2014
Publication date	Sep 24, 2019
Grant date	Sep 24, 2019

Abstract

An integrated pressure plate and port plate, and method of forming same, for a pump includes a housing having a pumping chamber formed therein. The housing includes first and second metal pressure plate portions that form at least a portion of the pumping chamber wherein at least one of the first and second pressure plate portions has a hard coating formed of a different material than a remainder of the housing metal on a surface thereof where integrated ports are formed on surface(s) of the pressure plate portion(s). Surface irregularities relieve stresses and promote adhesion of the coating (e.g., tungsten carbide) to the underlying metal (aluminum alloy).

First claim

What is claimed is:

1. A pump assembly comprising:
a housing having a pumping chamber formed therein;
the housing including first and second metal pressure plate portions that form at least a portion of the pumping chamber,
wherein at least one of the first and/or second metal pressure plate portions has a hard coating on a surface thereof that is of a different material than a remainder of the metal of the at least one of the first and/or second metal pressure plate portions,
integrated ports are formed in surfaces of the first and/or second metal pressure plate portions,
wherein the first and second metal pressure plate portions include preselected surface irregularities only at locations that have no adverse effect on the structure and operation of the first and second metal pressure plate portion, the preselected irregularities relieve stresses and promote adhesion of the hard coating to the underlying metal; and
a rotor received in the pumping chamber for rotation relative to the housing.

2. The pump assembly of claim 1 wherein the each of the first and second metal pressure plate portions includes the hard coating that forms at least a portion of the pumping chamber.

3. The pump assembly of claim 2 wherein the hard coating is tungsten carbide.

4. The pump assembly of claim 1 wherein the housing is an aluminum or aluminum alloy.

5. The pump assembly of claim 1 wherein the hard coating is tungsten carbide and the hard coating is provided at least in those regions of the at least one of the first and/or second metal pressure plate portions that include the integrated ports.

6. The pump assembly of claim 1 wherein the first and second metal pressure plate portions are axially spaced and form the pumping chamber therebetween.

7. The pump assembly of claim 6 wherein the hard coating is provided at least in those regions of the first and/or second metal pressure plate portions that include the integrated ports.

8. The pump assembly of claim 1 wherein the metal of the at least one of the first and/or second metal pressure plate portions and the hard coating have different coefficients of thermal expansion.

9. A method of forming a pump assembly comprising:
providing a metal housing that forms an internal pumping chamber;
coating at least a portion of the surface of the metal housing with a material different than the metal;
forming purposeful surface irregularities in the metal housing only at locations that have no adverse effect on the structure and operation of the pump assembly to relieve stresses and enhance adhesion of the coating to the metal; and
providing a rotor in the pumping cavity.

10. The method of claim 9 wherein the surface coating step includes applying the coating on those surface portions of the housing that form the pumping chamber.

11. The method of claim 9 wherein the coating is tungsten carbide.

12. The method of claim 9 wherein the coating step includes using a material that has a different coefficient of thermal expansion than the metal.

13. The method of claim 9 wherein the coating step includes applying the coating in port areas of the housing that face the pumping chamber.

14. The method of claim 13 wherein the applying step includes using tungsten carbide as the coating.

15. The method of claim 14 wherein the metal housing providing step includes forming the housing from aluminum or aluminum alloy.

Assignees

• Eaton Corp
• Eaton Intelligent Power Ltd

Inventors

• Clements Martin A

Classifications

• F04C2230/91

  Coating · CPC title

• F04C2/3441 Primary

  the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation · CPC title

• F04C2/34

  having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members · CPC title

• F04C2240/30

  Casings or housings · CPC title

• F04C2230/92

  Surface treatment · CPC title