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High-pressure fuel pump

a fuel pump and high-pressure technology, applied in the direction of liquid fuel engines, piston pumps, positive displacement liquid engines, etc., can solve the problems of reducing compression efficiency and large volume of pressurizing chambers, and achieve high energy efficiency, high compression efficiency, and high energy efficiency without increasing the volume of compression chambers

Inactive Publication Date: 2007-05-17
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a high-pressure fuel pump that has a relief valve device for returning fuel abnormally high in pressure. The relief valve device is designed to increase the efficiency of the pump without increasing the volume of the compression chamber. This is achieved by constructing the relief valve device so that only the relief valve can be installed on the pressurizing chamber side and the spring mechanism can be installed on the outlet passage side of the pump.

Problems solved by technology

However, in the above prior art, since the relief valve device is installed within the pressurizing chamber or within a passage leading to the pressurizing chamber, the volume of the pressurizing chamber substantially becomes large and the compression efficiency becomes lower.

Method used

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Experimental program
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first embodiment

[0019] The construction and operation of a fuel feeding system related to this embodiment will be described below with reference to FIG. 4. FIG. 4 is a general outline view of the system.

[0020] The portion enclosed with a broken line represents a pump body 1 of a high-pressure fuel pump. An arrangement and parts inside the enclosing broken line are integrally installed in the pump body 1.

[0021] Fuel in a fuel tank 20 is pumped up by a feed pump 21 and is fed to an inlet joint 10a in the pump body 1 through a suction pipe 28. At this time, the pressure of the fuel to be fed to the pump body 1 is regulated to a constant pressure by a pressure regulator 22.

[0022] The fuel having passed through the inlet joint 10a then passes through a pressure pulsation damping device 9 and an inlet passage 10d, and the fuel reaches pre-inlet port 30a l of a solenoid-controlled inlet valve 30. The inlet valve 30 constitutes a capacity variable mechanism for the high-pressure fuel pump. As to the pre...

second embodiment

[0098] A second embodiment of the present invention will be described below with reference to FIGS. 6 and 7.

[0099] In the example shown in FIG. 6, a unitized relief valve device 100 is mounted on top of the pressurizing chamber 11. In this example, a holder 111 for the relief valve device is fixed integrally to a relief valve seat 101 by welding 111a. The holder 111 is provided with an aperture 111b for communicating to a relief passage 110. Other members identified by the same reference numerals as in the first embodiment represent the same functional members as in the first embodiment.

[0100] In this embodiment, an aperture 11F is formed in the top of the pressurizing chamber 11. The aperture 11F is closed with the relief valve seat 101 and the relief valve 102. Only the relief valve 102 among all members of the relief valve device is disposed on the pressurizing chamber 11-side. When the relief valve 102 opens, the relief chamber 112 and the aperture 11F communicate to each othe...

third embodiment

[0102] A third embodiment of the present invention will be described below with reference to FIG. 8.

[0103] In the embodiment illustrated in FIG. 8 the fuel outlet port 12 and the relief passage 110 are disposed in a triangular form and this point is the same as in the embodiment illustrated in FIG. 1.

[0104] In the embodiment illustrated in FIG. 1, because of the type wherein the outlet valve device 8 is mounted from the pressurizing chamber side, the inlet-side hole 11A and the outlet-side hole 11C in the pressurizing chamber are disposed on the same axis.

[0105] In such a type as the embodiment illustrated in FIG. 8 wherein the outlet valve device 8 is mounted into the outlet-side hole 11C from the outside of the pump body 1, it is possible to construct the pump so that the solenoid-controlled inlet valve 30 and the relief valve device 100 are disposed on the same axis.

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Abstract

A high-pressure fuel pump comprises a pressurizing chamber for pressurizing fuel, an outlet valve for discharging the fuel pressurized in the pressurizing chamber to an outlet passage, a relief passage for connecting the outlet passage located downstream of the outlet valve and the pressurizing chamber with each other while bypassing the outlet valve. A relief valve device is provided in the relief passage and adapted to open when an internal pressure of the outlet passage becomes higher than that of the pressurizing chamber, thereby providing communication between the outlet passage and the pressurizing chamber. The relief valve includes a relief spring mechanism for pressing a relief valve to a relief valve seat. At least the relief spring mechanism among members of the relief valve device is provided outside the pressurizing chamber in the pump body.

Description

CLAIM OF PRIORITY [0001] The present application claims priority from Japanese application serial no. 2005-331036, filed on Nov. 16, 2005, the contents of which are hereby incorporated by references into this application. FIELD OF THE INVENTION [0002] The present invention relates to a high-pressure fuel pump for feeding high-pressure fuel to a fuel injection valve in an internal combustion engine. [0003] The present invention is particularly concerned with a high-pressure fuel pump having a relief valve device installed into a pump body, the relief valve device serving as a safety device for returning fuel to a pressurizing chamber when the pressure of discharged fuel becomes abnormally high. BACKGROUND ART [0004] In Japanese Patent Laid-Open Publication No. 2004-138062 there is described a high-pressure fuel pump having a relief valve device, the relief valve device comprising a valve seat member having a central fuel passage and a seat surface formed around the central fuel passa...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F04B7/00
CPCF02M59/102F02M59/366F02M59/367F02M59/462F02M63/005F04B53/06F02M59/025F04B7/02F04B17/05F04B19/22F04B49/03F04B49/035F04B49/08F04B53/10F04B53/1002F04B53/1017F04B53/1087F04B53/14F04B53/16
Inventor USUI, SATOSHIYAMADA, HIROYUKITOKUO, KENICHIROONOSE, TORUABE, MASAMI
Owner HITACHI LTD
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