Pump with wear-resistant barrel and plunger having coating support

Patent metadata

Field	Value
Publication number	US-10393111-B2
Application number	US-201615381004-A
Country	US
Kind code	B2
Filing date	Dec 15, 2016
Priority date	Jan 30, 2015
Publication date	Aug 27, 2019
Grant date	Aug 27, 2019

Abstract

A pumping mechanism is disclosed. The pumping mechanism may include a barrel formed of a barrel substrate and including a first end surface, a second end surface opposite the first end surface, and a bore between the first and second end surfaces. Each of the first and second end surfaces and the bore is coated with a metal plating. The pumping mechanism may further include a plunger formed of a plunger substrate and configured to be slidably disposed in the bore in barrel, the plunger substrate having a tribological coating.

First claim

What is claimed is:

1. A pumping mechanism comprising:
a barrel formed of a barrel substrate and including:
a first end surface;
a second end surface opposite the first end surface; and
a bore between the first and second end surfaces;
wherein each of the first and second end surfaces and the bore is coated with a metal plating; and

a plunger formed of a plunger substrate and configured to be slidably disposed in the bore in barrel, the plunger substrate having a tribological coating.

2. The pumping mechanism of claim 1 , wherein the pumping mechanism further comprises a head, the head being coated with the metal plating.

3. The pumping mechanism of claim 1 , wherein the metal plating includes nickel.

4. The pumping mechanism of claim 1 , wherein the metal plating is electroless nickel plating.

5. The pumping mechanism of claim 4 , wherein the electroless nickel plating has a Rockwell C hardness of at least 60 HRC.

6. The pumping mechanism of claim 1 ,
wherein the pumping mechanism further comprises a head formed of a head substrate, and
wherein the barrel substrate and the head substrate each include stainless steel.

7. The pumping mechanism of claim 1 , wherein the pumping mechanism is connected to a source of cryogenic fluid.

8. The pumping mechanism of claim 1 , wherein the plunger substrate is nitride-hardened to a depth of between 20 and 150 microns below an outer surface of the plunger.

9. The pumping mechanism of claim 8 , wherein the plunger substrate has a Rockwell C hardness of at least 60 HRC to a depth of between 20 and 150 microns below an outer surface of the plunger.

10. The pumping mechanism of claim 8 , wherein the tribological coating includes diamond-like carbon (DLC).

11. The pumping mechanism of claim 8 , wherein barrel substrate and the plunger substrate each comprise 17-4 PH stainless steel.

12. A pumping mechanism comprising:
a barrel formed of a barrel substrate and having a bore;
a plunger formed of a plunger substrate and slidably disposed within the bore in the barrel, the plunger substrate being nitride-hardened to a depth of between 20 and 150 microns below an outer surface of the plunger; and
a coating disposed on the outer surface of the plunger, the coating comprising a tribological material,
wherein each of a first end surface of the barrel and a second end surface of the barrel is coated with a metal plating.

13. The pumping mechanism of claim 12 , wherein the plunger substrate comprises stainless steel.

14. The pumping mechanism of claim 13 , wherein the stainless steel is 17-4 PH stainless steel.

15. The pumping mechanism of claim 12 , wherein the plunger substrate has a Rockwell C hardness of at least 60 HRC to the depth of between 20 and 150 microns.

16. The pumping mechanism of claim 12 , wherein the plunger substrate is ion nitride-hardened.

17. The pumping mechanism of claim 12 , wherein the pumping mechanism is connected to a source of cryogenic fluid.

18. The pumping mechanism of claim 12 , wherein the tribological material includes diamond-like carbon (DLC).

19. A pump comprising:
a mounting surface;
a pumping mechanism connected to the mounting surface, the pumping mechanism including:
a barrel formed of stainless steel and having a first end surface abutting the mounting surface, a second end surface opposite the first end surface, and a bore, each being coated with a nickel plating;
a head formed of stainless steel and abutting the second end surface of the barrel;
a plunger formed of stainless steel and slidably disposed in the bore in the barrel, the plunger having a Rockwell C hardness of at least 60 HRC to the depth of between 20 and 150 microns below an outer surface of the plunger; and

a coating disposed on the outer surface of the plunger, the coating comprising diamond-like carbon (DLC).

20. The pump of claim 19 , wherein the plunger is nitride-hardened to the depth of between 20 and 150 microns below an outer surface of the plunger.

Assignees

• Caterpillar Inc

Inventors

• Stockner Alan Ray
• Brown Aaron M
• Thangaswamy Sridhar
• Cox Glenn B
• Truhan Jr John Jay
• Pollard Michael J
• Mcdonnel John P

Classifications

• F04B53/166

  Cylinder liners · CPC title

• F05C2211/00

  Inorganic materials not otherwise provided for · CPC title

• F05C2201/0406

  Chromium · CPC title

• F05C2251/14

  Self lubricating materials; Solid lubricants · CPC title

• F04B53/007

  Cylinder heads · CPC title