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Method for manufacturing boreholes, components and fuel injectors

A fuel injector and component technology, which is applied in the field of manufacturing drilling holes, can solve problems such as strength reduction and difficulty, and achieve the effect of increasing manufacturing costs

Active Publication Date: 2021-08-03
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This residual tensile stress reduces the strength of the component or valve part in the area of ​​the newly hardened zone or the discharge restriction.
It is also made difficult that the region of the discharge restriction is a critical point in terms of the strength of the component or valve element

Method used

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  • Method for manufacturing boreholes, components and fuel injectors
  • Method for manufacturing boreholes, components and fuel injectors
  • Method for manufacturing boreholes, components and fuel injectors

Examples

Experimental program
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Embodiment Construction

[0019] figure 1 shows in simplified form a valve part 10 made of steel of an otherwise not shown fuel injector 100 which is used as a so-called common rail system for injecting fuel into the combustion chamber of an internal combustion engine component. The internal combustion engine is a self-igniting internal combustion engine, wherein the system pressure also prevailing in the region of the valve part 10 is preferably greater than 2000 bar.

[0020] The valve element 10 , which is arranged inside the not-shown housing of the fuel injector 100 , serves in a known manner to control the entry of fuel flowing out of a so-called control chamber into the low-pressure region of the fuel injector 100 in order to thereby influence the nozzle needle. exercise. Purely by way of example, reference is made to DE 10 2012 219 657 A1 of the applicant with regard to the basic structure and mode of function of such a fuel injector 100 .

[0021] The valve part 10 has an outlet opening 11 ...

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Abstract

The invention relates to a method for producing a borehole (11) in a component (10) of a fuel injector (100), in particular for a pressure medium under high pressure, wherein the borehole (11) has a A section (13) produced by erosion, wherein the component (10) consisting of steel is subjected to a heat treatment for hardening the component (10).

Description

technical field [0001] The invention relates to a method for producing boreholes. The invention also relates to a component designed as a valve part of a fuel injector, in which the borehole has been produced according to the method according to the invention, and to a fuel injector having the same. Background technique [0002] Methods for producing boreholes are already known from practice. In a known method, an outlet opening with an integrated outlet restriction is produced in the valve part of the fuel injector. The outlet opening connects the control chamber within the fuel injector to the low-pressure region, so that the throughflow of fuel at high pressure from the control chamber in the direction of the low-pressure region can influence or control the movement of the nozzle needle in a known manner. The drainage hole basically consists of three borehole sections, one of which is a central borehole section with a smaller cross-section or diameter forming the draina...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/00C21D1/18
CPCC21D1/18C21D9/0068C21D9/08
Inventor T·尼埃里克洛H·奥佩尔卡J·弗勒朗
Owner ROBERT BOSCH GMBH
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