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High-pressure fuel supply pump

A high-pressure fuel and supply pump technology, which is applied in the directions of fuel injection pumps, fuel injection devices, charging systems, etc., can solve the problems such as the decrease in the injection volume of the high-pressure fuel supply pump and the decrease in energy efficiency.

Active Publication Date: 2008-03-05
HITACHI ASTEMO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In such a case, the valve opening operation of the safety valve has the problem of causing a decrease in the discharge amount of the high-pressure fuel supply pump and a decrease in energy efficiency.

Method used

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Embodiment 1

[0038] A first embodiment of the present invention will be specifically described based on FIGS. 1 to 3 . First, the structure and operation of the system will be described using the overall structure diagram of the system shown in FIG. 3 .

[0039] The portion surrounded by a dotted line represents the pump housing 1 of the high-pressure pump, and the mechanisms and parts indicated by the dotted line are integrally assembled in the pump housing 1 of the high-pressure pump.

[0040] The fuel in the fuel tank 20 is sucked up by the feed pump 21 and sent to the suction joint 10 a of the pump casing 1 through the suction pipe 28 . At this time, the suction fuel flowing to the pump housing 1 is regulated to a certain pressure at the pressure regulator 22 .

[0041] The fuel passing through the suction joint 10a reaches the suction port 30a of the electromagnetic suction valve mechanism 30 constituting the capacity variable mechanism via the pressure pulsation reducing mechanism 9...

Embodiment 2

[0119] Next, a second embodiment will be described based on FIG. 1 and FIGS. 8 to 18 .

[0120] First, a specific structure of the safety valve mechanism B200 will be described with reference to FIGS. 8 to 10 .

[0121] The safety valve mechanism B200 consists of the following parts: a safety valve body B206 integrated with the safety valve seat B201, a safety valve B202, a safety pressing piece B203, a safety spring B204, and a safety spring regulator B205. The safety valve mechanism B200 is assembled outside the pump casing 1 as an auxiliary component, and then fixed to the pump casing 1 by press-fitting.

[0122]First, insert the safety valve B202, safety pressing piece B203, and safety spring B204 into the safety valve body B206 in sequence, and press and fix the safety spring adjuster B205 to the safety valve body B206. The setting load of the safety spring B204 is determined by the fixed position of the safety spring adjuster B205. The opening pressure of the safety va...

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Abstract

The present invention provides a high-pressure fuel supply pump, when ejecting value is open and under transient state of high-pressure fuel pump pressing fuel, even though the pressure of instant ejecting fuel increase to become abnormal pressure, the safety value will not be open. In the fuel ejecting path of upstream side (that is ejecting value side) of the safety value within the fuel safety path, setting a mechanism for preventing the pressure generated instantly within the path to enter the safety value. More specifically, setting alveolus in the safety path, which reduces the acting energy to the safety value of the pressure due to opening high-pressure fuel pump value; or setting mechanism for cutting off the transmission of anormal pressure in the safety path.

Description

technical field [0001] The present invention relates to a high-pressure fuel supply pump for pressurizing fuel from a feed pump and feeding it to a fuel injection valve of an internal combustion engine, particularly for an internal combustion engine of the in-cylinder fuel injection type. [0002] In particular, it relates to a high-pressure fuel supply pump incorporating a relief valve mechanism as a relief valve for abnormally high pressure for avoiding fuel pressure in a high-pressure side fuel passage, incorporated in a pump housing. Background technique [0003] Such an existing high-pressure fuel supply pump, as disclosed in Japanese Patent Application Laid-Open No. 2003-343395, is provided with a high-pressure fuel passage connecting the downstream of the discharge valve and an upstream of the suction valve on the pump casing of the high-pressure fuel supply pump. The fuel safety passage of the low-pressure fuel passage is provided with a check valve as a safety valve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M55/00F02M55/02F02M59/00
CPCF02M63/005F02M59/367F02M55/04F02M63/0054F02M59/366F02M63/0245F02M63/0056F02M59/462
Inventor 臼井悟史山田裕之德尾健一郎桥田稔山村武史枇本亘高桥直
Owner HITACHI ASTEMO LTD
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