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Nozzle assembly for fuel injection valve, and fuel injection valve

A fuel injection valve and component technology, applied in fuel injection devices, special fuel injection devices, charging systems, etc., can solve problems such as poor preparation of gaseous fuel, high calorific value, etc., achieve reliable medium separation, improve service life, wear and tear reduced effect

Inactive Publication Date: 2020-01-31
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Diesel is injected uncontrolled the next time the gas needle opens, which is accompanied by an excessively high calorific value and poor preparation of the gaseous fuel

Method used

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  • Nozzle assembly for fuel injection valve, and fuel injection valve
  • Nozzle assembly for fuel injection valve, and fuel injection valve
  • Nozzle assembly for fuel injection valve, and fuel injection valve

Examples

Experimental program
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Effect test

Embodiment Construction

[0025] Depend on figure 1 The nozzle assembly of the present invention is available for fuel injection valves, especially for dual fuel injectors. The nozzle assembly comprises two coaxially arranged nozzle needles 1 , 2 guided within one another, which are accommodated at least in sections in a nozzle body 9 . For this purpose, the nozzle body 9 has a central bore 10 . The outer nozzle needle 1 delimits within the bore 10 a gas region 11 which can be impinged with gaseous fuel. The inner nozzle needle 2 and the outer nozzle needle 1 together delimit a liquid fuel region 12 . In this case, the outer nozzle needle 1 forms the sealing seat 13 of the inner nozzle needle 2 , and the nozzle body 9 forms the sealing seat 14 of the outer nozzle needle 1 .

[0026] The two nozzle needles 1 , 2 are controlled hydraulically, liquid fuel, preferably diesel fuel, being used as control medium.

[0027] In order to control the lift movement of the outer nozzle needle 1 , a control chamb...

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PUM

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Abstract

The invention relates to a nozzle assembly for a fuel injection valve. The fuel injection valve is used for injecting gaseous and / or liquid fuel into a combustion chamber of an internal combustion engine, the nozzle assembly comprises nozzle needles (1, 2) which are arranged coaxially and are guided in a nested manner with respect to each other, and a sealing element (4) is arranged between the outer nozzle needle (1) and a guide (3) for separating the medium. According to the invention, the sealing element (4) is radially pre-tensioned against the guide (3) by a pre-tensioning force, the pre-tensioning is variable such that the sealing element (4) can be partially unloaded during a lift movement of the outer nozzle needle (1). The invention further relates to a fuel injection valve havingsuch a nozzle arrangement.

Description

technical field [0001] The invention relates to a nozzle assembly for a fuel injection valve. Furthermore, the invention relates to a fuel injector having such a nozzle arrangement for injecting gaseous and / or liquid fuel into a combustion chamber of an internal combustion engine. Background technique [0002] In the so-called NGDI injection method ("Natural Gas Direct Injection": Natural Gas Direct Injection), natural gas or methane gas is injected under high pressure directly into the combustion chamber of the internal combustion engine and is ignited and diffused by means of a preceding diesel pilot injection. burning. Compared with traditional diesel combustion, this combustion method has the following advantages: CO 2 Emissions can be reduced by up to 25%. In addition, fuel costs can be reduced. Furthermore, the combustion method also has a diesel-like combustion behavior and thus a torque behavior, enabling integration into existing diesel drive systems, in particu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M21/02F02M43/04F02M61/18F02M45/08
CPCF02M21/0215F02M21/0248F02M21/023F02M43/04F02M61/18F02M45/086F02M2200/46F02M2200/16Y02T10/30
Inventor J·韦斯内尔M·卡茨
Owner ROBERT BOSCH GMBH
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