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Valve for regulating liquid flow

A liquid and valve seat technology, which is applied to fuel injection valves driven by fluid pressure, fuel injection devices with stress reduction measures, engine components, etc. , the effect of the solution is simple

Inactive Publication Date: 2002-11-27
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In such a valve, the pressure in the coupling cavity (junction cavity) is high, so that this pressure expands radially and is prone to leakage

Method used

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  • Valve for regulating liquid flow
  • Valve for regulating liquid flow
  • Valve for regulating liquid flow

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Experimental program
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Effect test

Embodiment Construction

[0016] The valve according to the invention is used as a fuel injection valve, the main parts of which are shown in a sectional view in FIG. 1 . The injection valve has a valve housing 1 in which a valve needle 3 runs in a longitudinal bore 2 . The valve needle 3 is equipped with a conical sealing surface 4 at one end, which works together with a valve seat 6 on the tip of the casing extending into the combustion chamber, and some fuel injection holes are drawn from the valve seat, and the fuel injection valve The inside, here surrounding the valve needle 3, is filled with the annular chamber 7 under the injection pressure, which is connected to the combustion chamber for injection when the valve needle lifts off its seat. The annular chamber is connected to a further pressure chamber 8 which is always connected to a pressure line 10 via which fuel at injection pressure is delivered from the high-pressure accumulator 9 to the injection valve. This high pressure also acts in t...

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Abstract

The invention relates to a valve for regulating liquid flow, actuated by means of a liquid-filled coupling chamber (30) situated between an actuator piston (31) of a piezo-actuator (32) and a piston (25) actuating a valve element (22). In order to reduce the danger of leakage, both pistons (25, 31) enclosing the coupling chamber (30) are fitted with a contact pressure intensifier (35) which enables expansion of the actuator piston (31) and / or of the piston (25) actuating the valve element (22) in the region of their end faces (29). The inventive valve is used in fuel injection devices for internal combustion engines of motor vehicles.

Description

technical field [0001] The invention relates to a valve for controlling liquids. Background technique [0002] Such a valve is known from EP-A-O 477 400 . There, the actuating piston of the valve element is mounted sealingly and displaceably in the part with the smaller diameter of the stepped bore, for which a piston with a larger diameter moved by the piezoelectric actuator is mounted in the part with the larger diameter of the stepped bore. section. A hydraulic chamber is formed between the two pistons, that is, if the large piston moves through the actuator according to a certain stroke, the operating piston of the valve element moves according to a stroke that increases the diameter conversion ratio of the stepped hole. The valve element, the operating piston, the actuating piston with a larger diameter and the piezo actuator are located in series on a common axis. [0003] In such a valve, the pressure in the coupling chamber (junction chamber) is high, so that this...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02M59/46F02M47/02F02M47/00F02M51/00F02M51/06
CPCF02M47/027F02M63/0026F02M2200/03F02M2200/16F02M2200/703F02M2547/003
Inventor 鲁道夫·海因茨迪特尔·青茨勒罗格·波奇恩克劳斯-彼得·施莫尔弗里德里希·伯金
Owner ROBERT BOSCH GMBH