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Valve assemblies for fuel systems and methods

A fuel system and valve assembly technology, applied in the direction of charging system, fuel injection pump, fuel injection device, etc.

Active Publication Date: 2017-09-12
CATERPILLAR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Despite some merits presented by Taylor et al., there is still room for improvement

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  • Valve assemblies for fuel systems and methods
  • Valve assemblies for fuel systems and methods
  • Valve assemblies for fuel systems and methods

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Embodiment Construction

[0013] refer to figure 1 , shows an engine 10 having a fuel system 12 according to one embodiment. Engine 10 includes an engine housing 22 within which are formed a plurality of cylinders 24 ; and a plurality of pistons 26 each reciprocating within each cylinder 24 in a conventional manner. In certain embodiments, engine 10 may comprise a direct fuel injected compression ignition diesel engine, although the invention is not limited thereto. Fuel system 12 may include a fuel tank 14 and a fuel pump 16 configured to pressurize fuel from fuel tank 14 to provide to common rail 18 . Pump 16 may comprise a high pressure pump configured to maintain common rail 18 at a relatively high pressure, up to 350 MPa in some embodiments, and may be located between fuel tank 14 and pump 16 in some embodiments. The other low pressure fuel transfer pump is fluidly secured in between. Fuel pump 16 may include a common rail outlet 17 for providing pressurized fuel to common rail 18 and a drain o...

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Abstract

A valve assembly in an internal combustion engine fuel system includes a valve member movable within a valve body to contact a valve seat and block fluid communication between first and second passages. The valve seat and valve member each include a multi-layered coating having a harder metal nitride base layer and a softer metal nitride outer layer. The base layer is relatively incompliant to impacts between the valve member and the valve seat, and the outer layer is relatively compliant to the impacts and thereby deformable. Related methodology is disclosed.

Description

technical field [0001] The present invention relates generally to a valve assembly in an internal combustion engine fuel system, and more particularly to a multilayer coating on an impact part of the valve assembly having a hard metal nitride base layer and a soft metal nitrogen compound outer layer. Background technique [0002] Various fuel system components in modern internal combustion engine fuel systems are subject to harsh operating conditions. High fuel pressures, debris particles, and repeatedly impacting components all tend to require that the hardware used in such systems be robust. If the various in-service and fracture wear phenomena are not addressed, performance degradation and potential system failure may result. Hardening of materials, coating of specific components, and tight manufacturing tolerances are all techniques that have been used in various forms to extend the service life of fuel systems. [0003] US Patent Application No. 11 / 863,777 to Taylor ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02M59/46F02M61/18
CPCF02M47/027F02M61/166F02M63/0045F02M63/0077F02M2200/02F02M2200/9038F02M61/1886F02M61/1893F02M63/0015F02M63/004F02M2200/9046
Inventor B·冯S·C·泰勒L·V·贝格C·M·弗兰纳里
Owner CATERPILLAR INC