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Coatings for use in fuel system components

a fuel system and coating technology, applied in the direction of liquid fuel engines, machines/engines, positive displacement liquid engines, etc., can solve the problems of fuel system components leaking or losing pressure, coatings may wear at an unacceptably high rate, and cannot be suitable for use on opposing surfaces

Inactive Publication Date: 2008-06-26
CATERPILLAR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]A third aspect of the present disclosure includes a method of controlling wear in a fuel pump assembly, wherein the fuel pump assembly comprises a first fuel pump component substrate, a second fuel pump component substrate, a first coating on the first substrate, and a second coating on the second substrate. The first coating may be selected from the group consisting of metal nitrides and diamond like carbon, and the second coating may be selected from the group consisting of metal nitrides and diamond like carbon. The method includes operating the fuel pump assembly such that the first coating repeatedly impacts the second coating. The method may further include supplying fuel to the fuel pump assembly.

Problems solved by technology

For example, the coatings of the '499 patent may not provide suitable impact wear resistance, and therefore, may not be suitable for use on opposing surfaces of fuel pump components that may produce impact wear.
In addition, these coatings may wear at an unacceptably high rate in the presence of newer fuels.
Therefore, these coatings may fail when used under some conditions, thereby causing the fuel system component to leak or lose pressure.

Method used

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  • Coatings for use in fuel system components
  • Coatings for use in fuel system components
  • Coatings for use in fuel system components

Examples

Experimental program
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Embodiment Construction

[0014]FIG. 1 illustrates a fuel pump assembly 10 including a nail valve assembly 12, according to an exemplary disclosed embodiment. As shown, nail valve assembly 12 includes a moving valve 16 and valve body 14. Further, as shown, valve 16 engages valve body 14 to prevent fuel flow through pump assembly 10. During operation, valve 16 may repeatedly and forcefully engage valve body 14, causing repeated impact between opposing surfaces of valve 16 and valve body 14. To prevent wear of mating surfaces of valve 16 and valve body 14, these surfaces may be produced from or include a coating that will provide resistance to impact and / or sliding wear.

[0015]FIG. 2 is a cross-sectional view of a nail valve 12 of a fuel pump assembly 10 including coatings 18, 18′ on opposing surfaces of the fuel pump assembly components (valve 16 and valve body 14), according to an exemplary embodiment. As shown, valve 16 and valve body 14 can include primary coating layers 20, 20′ disposed on substrate materi...

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Abstract

A fuel pump assembly is provided. The assembly includes a first pump component having a first substrate and a first coating disposed on the first substrate. The assembly further includes at least one second pump component having a second substrate and a second coating disposed on the second substrate, wherein the first and second coatings are configured to repeatedly impact one another. In addition, the first coating may be selected from the group consisting of metal nitrides and diamond like carbon, and the second coating may be selected from the group consisting of metal nitrides and diamond like carbon.

Description

[0001]This application claims benefit of U.S. Provisional Application No. 60 / 877,143, filed Dec. 26, 2006, the contents of which are incorporated herein by reference.TECHNICAL FIELD[0002]This disclosure relates to fuel system components and more particularly to coatings or surface treatments for fuel pump components.BACKGROUND[0003]Many internal combustion engines, whether compression ignition or spark ignition engines, are provided with fuel systems to satisfy the need for precise and reliable fuel delivery into the combustion chamber of the engine. Such precision and reliability is necessary to address the goals of increasing fuel efficiency, maximizing power output, and controlling undesirable by-products of combustion. Generally, fuel systems will include a fuel pump and one or more fuel injectors. The fuel pump will supply fuel to the injectors, which will subsequently provide precision control of the fuel supply and timing to engine cylinders.[0004]Traditionally, hard coatings...

Claims

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Application Information

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IPC IPC(8): F04B15/00
CPCC23C14/024C23C14/0605C23C14/0641F02M59/366F02M59/445Y10T29/49229F02M2200/9038F04B53/10F04B53/16F05C2203/083F05C2253/12F02M59/466
Inventor DAVIES, LUCY V.
Owner CATERPILLAR INC