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Method for connecting spark plug electrode and noble metal, and said spark plug electrode

A precious metal and spark plug technology, applied in the field of connecting spark plug electrodes and precious metals, can solve problems such as low resistance, achieve high process speed, save production costs, and improve the effect of melting zone

Inactive Publication Date: 2008-08-06
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By joining with the aid of a pulsed laser beam undesired areas of the alloy that are rich in nickel and therefore less resistant to attack and corrosion

Method used

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  • Method for connecting spark plug electrode and noble metal, and said spark plug electrode
  • Method for connecting spark plug electrode and noble metal, and said spark plug electrode
  • Method for connecting spark plug electrode and noble metal, and said spark plug electrode

Examples

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Embodiment Construction

[0032] figure 1 An example of a single-stage coating process for one electrode, ie a method for connecting spark plug electrode 1 to noble metal 2 , is described. The noble metal 2 according to the invention can be a pure noble metal or also all noble metal alloys suitable for the respective application.

[0033] figure 1 In particular, a section through a spark plug electrode 1 is shown, which here is an intermediate electrode which is filled with molten noble metal 2 in a prefabricated groove 6 and which is used, for example, for surface discharge spark plugs or air surface discharges in the spark plug. figure 1 The illustrated section through the intermediate electrode 1 is along the groove 6 .

[0034] According to the invention, a continuous laser 3 is used for melting, where, for example, a Nd:YAG laser or CO 2 laser or diode laser. Diode lasers are particularly suitable as they are currently significantly better than Nd:YAG lasers or CO 2 laser.

[0035] Here, th...

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PUM

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Abstract

The invention relates to a method for linking an electrode (1, 1') of a spark plug with a noble metal (2), which is characterized by linking the noble metal (2) locally with the electrode (1, 1') by means of heat generated by a continuous laser beam (3).

Description

technical field [0001] The invention relates to a method for connecting a spark plug electrode with a noble metal and a spark plug electrode. Background technique [0002] Spark plugs with electrodes, such as an intermediate electrode, have been known for a long time from the prior art, in which a noble metal tip is arranged at the front end of the intermediate electrode or the noble metal is provided in a region along the circumference. [0003] Thus, for example, EP 0 637 113 B1 describes a spark plug with an intermediate electrode of a heat-resistant and corrosion-resistant nickel alloy, the front end of which has a noble metal tip made of iridium or ruthenium . The thermal conductivity of nickel alloy is about 30Wm -1 K -1 or larger. In this document, the noble metal tip has a disc shape and is arranged concentrically with the front end of the electrode metal. [0004] By using eg a YAG laser such that the laser beam is applied to the noble metal tip / front end inter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01T21/02F02P13/00B23K26/00B23K26/20H01T1/00H01T13/20
CPCH01T21/02
Inventor 托马斯·于斯特尔海因茨·乌尔姆康拉德·丰克马丁·克拉森约亨·菲舍尔安德烈亚斯·本茨
Owner ROBERT BOSCH GMBH