Overflow valve for a fuel injection system, and fuel injection system

A fuel injection system and injection system technology, applied in the direction of fuel injection devices, special fuel injection devices, charging systems, etc., can solve problems such as overflow valve rigidity, spring chamber overfilling, etc., to achieve leakage and simple cost , easy to install effect

Active Publication Date: 2016-07-06
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the damping phase, the spring chamber of the overflow valve is additionally filled, so that there is a risk of overfilling the spring chamber and the resulting "stiffening" of the overflow valve

Method used

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  • Overflow valve for a fuel injection system, and fuel injection system
  • Overflow valve for a fuel injection system, and fuel injection system
  • Overflow valve for a fuel injection system, and fuel injection system

Examples

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Embodiment Construction

[0027] Figure 1 to Figure 3 A preferred embodiment of the overflow valve according to the invention is shown. Each of these overflow valves comprises a cylindrical valve housing 1 in which an axially displaceable piston-like valve element 4 is received such that it passes through the guide area of ​​the valve housing 1 are axially guided. The valve housings 1 each form an inlet 2 on the end side, which can be connected to the inlet region of a high-pressure pump, not shown. Furthermore, the valve housing 1 has a radial hole serving as the outlet 3, which has a circular cross-section or any other cross-section which, when based on the axial movement of the valve element 4 (in the position of the valve element 4 Figure 1 to Figure 3 The normal position shown in is the starting point) and when a connection is established between the inlet 2 and the outlet 3, excess fuel can be conducted from the inlet area to the low-pressure area 8 via said radial holes. The axial displacem...

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PUM

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Abstract

The invention relates to a fuel injection system, in particular an overflow valve for a common rail injection system, comprising a valve housing (1) with an inlet (2) and with at least one outlet (3), and comprising a valve element (4) which is accommodated in the valve housing (1) and which is guided in axially displaceable fashion and by means of the axial displacement of which counter to the spring force of a spring (5), the inlet (2) and the outlet (3) can be connected, wherein the spring (5) is accommodated in a spring chamber (6) of the valve housing (1), which spring chamber can be connected via a relief bore (7) to a low-pressure region (8) of the fuel injection system. According to the invention, means (9) for preventing overfilling of the spring chamber (6) are provided, wherein the means (9) comprise an annular groove (10, 10'), which is formed in the guide region of the valve element (4) and which is connected or connectable to the outlet (3), and/or a check valve (11) via which the spring chamber (6) is connectable to the low-pressure region (8). The invention also relates to a fuel injection system having an overflow valve of said type.

Description

technical field [0001] The invention relates to an overflow valve for a fuel injection system, in particular a common rail injection system, which has the features of the preamble of claim 1 . The invention also relates to a fuel injection system having such an overflow valve for pressure regulation and / or pressure limitation. Background technique [0002] An overflow valve of the type mentioned above is usually used in the low-pressure region, in particular in the inlet region, of a high-pressure fuel pump of a fuel injection system. The overflow valve serves to guide excess fuel back into the low-pressure region and in this way enables pressure regulation and / or pressure limitation. [0003] Such an overflow valve for a fuel injection system is known, for example, from the publication DE 10 2011 089 797 A1. It comprises: a valve housing with an inlet and an outlet; a piston-like valve element guided axially displaceable in the valve housing, the inlet and the outlet bein...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M37/00F02M63/00
CPCF02M37/0052F02M37/0029F02M2200/26
Inventor S·基费勒
Owner ROBERT BOSCH GMBH
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