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Overflow valve, in particular for use in a fuel injection system, high-pressure pump, and fuel injection system

A fuel injection system and overflow valve technology, especially used in the overflow valve used in the fuel injection system, to achieve the effects of improving vibration reduction, adjusting parameters, and improving response characteristics

Active Publication Date: 2019-05-03
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has been shown that the throttled flow out of it can flow back into the spring chamber in the opposite direction

Method used

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  • Overflow valve, in particular for use in a fuel injection system, high-pressure pump, and fuel injection system
  • Overflow valve, in particular for use in a fuel injection system, high-pressure pump, and fuel injection system
  • Overflow valve, in particular for use in a fuel injection system, high-pressure pump, and fuel injection system

Examples

Experimental program
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Embodiment Construction

[0024] according to figure 1 The fuel injection system of the present invention conveys fuel via a filter 1 from a fuel tank 2 by means of a fuel delivery pump 3 via a fuel line 4 to a high-pressure pump 5 , which is designed here as a radial piston pump.

[0025] Furthermore, the fuel injection system comprises a metering unit 6 and a high-pressure accumulator 7 , which is also referred to as a rail, which in turn is connected to injection valves (not shown further here) which inject fuel into the combustion chambers of the internal combustion engine middle.

[0026] The metering unit 6 is used to variably adjust the fuel supply quantity from the fuel delivery pump 3 to the high-pressure pump 5 as required. An overflow valve 8 is arranged in the feed line from the fuel delivery pump 3 to the metering unit 6 , which serves to drain off the fuel delivered in excess by the fuel delivery pump 3 in a controlled manner and via the return line 9 . Leading back into the fuel tank 2...

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Abstract

The invention relates to an overflow valve, a high-pressure pump, and a fuel injection system with a high-pressure pump (5) for generating an injection pressure, wherein the pump supply pressure can be adjusted by an overflow valve (8) that has a piston unit (13) arranged in a valve housing (10) in a longitudinally movable manner, said valve housing being provided with a supply connection (11) anda return connection (12). The piston unit interacts with the return connection (12) in the form of a valve element and is acted upon rearwards by at least one valve spring (14) accommodated in a spring chamber (15) of the valve housing (10) in order to generate the switching pressure. The spring chamber (15) is connected to means for removing fuel which penetrates the spring chamber in order to generate a gas bubble in the spring chamber (15).

Description

technical field [0001] The invention relates to a spill valve of the type according to the independent claim, in particular for use in a fuel injection system, and to a high-pressure pump, in particular for generating a fuel injection pressure, and a fuel injection system, wherein the fuel The overflow valve of the injection system has a piston unit which is arranged displaceably in a direction against the force of at least one valve spring in a valve housing provided with an inlet connection and a return connection. Background technique [0002] DE 10 2009 027 146 A1 discloses a high-pressure fuel pump with a low-pressure area on the suction side, in which an overflow valve is arranged, which has a valve housing, a piston unit as valve element, and A valve spring, the valve housing is fixed in the pump housing and has an inlet and one or more outlets. The valve element accommodated in the valve housing is displaceable in an axial direction parallel to the longitudinal axis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M59/46F02M37/00F02M63/00
CPCF02M37/0029F02M59/46F02M63/004F16K15/044
Inventor H·艾泽勒M·法特达乔
Owner ROBERT BOSCH GMBH