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Pressure reducing valve for single plunger fuel pump

A pressure reducing valve, fuel pressure technology, applied in parts of pumping devices for elastic fluids, fuel injection pumps, pumps, etc., can solve the problems of enhancement and unfavorable efficiency, and achieve the effect of reducing the pressure of the pump chamber

Active Publication Date: 2017-12-22
思达耐运营有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This added dead volume combined with increased pump pressure is very detrimental to pump efficiency

Method used

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  • Pressure reducing valve for single plunger fuel pump
  • Pressure reducing valve for single plunger fuel pump
  • Pressure reducing valve for single plunger fuel pump

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] Refer to attached Figure 1-7 , illustrating two representative examples.

[0019] figure 1 is a schematic diagram illustrating a complete system of a fuel system for an internal combustion engine as described in US Published Patent Application No. US 2011 / 0126804. The low pressure pump 2 pressurizes the fuel from the fuel tank 1 and transfers this fuel at low supply pressure to the high pressure pump 3 through the inlet connection. The fuel then passes through the accumulator 4 and continues to pass through the passage 2' to the normally open inlet regulating valve 5 at a low pressure. A normally closed regulator valve is also suitable for this fuel system. The fuel is then sucked into the pump chamber 10, and the fuel is pressurized within the pump chamber 10 by the rising action of the pump plunger 8 as the pump plunger 8 is reciprocally driven by the camshaft 9 of the engine. The inlet regulating valve 5 is acted on by the regulating valve spring 7 and the solen...

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PUM

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Abstract

A fuel pump comprising a low-pressure supply line leading to the pump chamber; a pumping plunger for pressurizing the fuel in the pump chamber; a line for transferring pressurized fuel from the pump chamber to a high-pressure outlet line during pumping an outlet valve; and an overpressure relief valve connected between the high pressure outlet line and the pump chamber, the spherical relief valve member being spring biased against the relief valve seat. The spring is in a spring chamber which is fluidly isolated from the pump chamber during closure of the valve member, preferably the spring chamber is in direct hydraulic communication with the low pressure supply line, thereby reducing dead volume during normal pumping. The spring can act on the valve element via the piston. In an alternative embodiment, the piston can provide an overflow path from the pump chamber to the low pressure supply tube.

Description

Background technique [0001] The present invention relates to high pressure fuel supply pumps for gasoline engines. [0002] Single-piston, cam-driven fuel pumps have become a common solution for generating high-pressure fuel for common rail direct injection gasoline engines. [0003] It is known in the industry that pumps must include an outlet check valve to prevent rearward release of common rail pressure when the pump is on its intake stroke cycle. It has become an industry standard to incorporate pressure reducing valves within pumps to protect the entire high pressure system from accidental overpressure due to system failure. To protect the rail and injectors, the pressure relief valve must be in hydraulic communication with the rail. Two executions of such hydraulic communication (parallel to pump flow) have been described in US Patent 7,401,593 and US Patent 8,132,558. The implementation described in the prior art successfully achieved reasonable relief pressure by h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02M37/04F16K17/04F16K17/20
CPCF02M37/0058F02M37/04F02M59/46F02M63/005F04B1/0452F04B53/10F16K17/0406F16K17/044F16K17/048F16K17/04
Inventor K·R·莫雷尔R·G·卢卡斯
Owner 思达耐运营有限责任公司