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Pre-chamber spark plug having adapted cap geometry

A geometry and pre-chamber technology, applied in spark plugs, electrical components, circuits, etc., can solve problems such as damage to combustion engines, undesired wear of hot ignition covers, electrode wear and heat accumulation, etc. The effect of avoiding heat accumulation and improving the lifespan

Active Publication Date: 2021-11-12
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Heat buildup can result at the cover due to the would-be insufficient heat dissipation in the prechamber spark plug, which can lead to undesired hot ignition and thus to increased cover wear and electrode wear
In addition, damage to the combustion engine can be achieved due to uncontrolled ignition

Method used

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  • Pre-chamber spark plug having adapted cap geometry
  • Pre-chamber spark plug having adapted cap geometry
  • Pre-chamber spark plug having adapted cap geometry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] referenced below Figure 1 to Figure 3 A prechamber spark plug 1 according to a preferred exemplary embodiment of the present invention will be described in detail.

[0021] as from figure 1 As can be seen in the figure, the pre-chamber spark plug 1 includes a housing 2 and a cover 3 . The cover 3 is arranged on that end of the housing 2 facing the combustion chamber 10 . The cap 3 together with the housing 2 forms the prechamber 5 of the prechamber spark plug 1 . The pre-chamber spark plug 1 is in figure 1 is schematically shown in and furthermore has electrodes 21 , insulators 23 and electrical connections 24 .

[0022] as in figure 1As shown schematically, prechamber spark plug 1 is screwed into a cylinder head 22 of a combustion engine such that cover 3 protrudes into combustion chamber 10 . As a result, the cover 3 is directly exposed to the high temperatures in the combustion chamber 10 .

[0023] In order to be able to absorb and dissipate high temperature...

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PUM

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Abstract

The present invention relates to a pre-chamber spark plug (1), comprising: a housing (2); and a cap (3), which has at least one through-opening (4), wherein: the cap (3) is arranged on a combustion-chamber-side end of the housing (2); the cap (3) and the housing (2) form a pre-chamber (5); and an outer cap surface (A) of the cap (3) facing away from the pre-chamber (5) has at least one predefined relationship (A / B, A / C, A / D, A / E) to an additional geometric feature of the cap (3).

Description

technical field [0001] The invention relates to a prechamber spark plug with improved heat dissipation due to an adapted cover geometry. Background technique [0002] Prechamber spark plugs for combustion engines are known from the prior art. Such a prechamber spark plug is shown, for example, in DE 10 2017 204 A1. The prechamber spark plug comprises - as is known for conventional spark plugs - a center electrode and a ground electrode arranged in a housing, which define between themselves an ignition gap in which the ignition air fuel mixture. This ignited air-fuel mixture is then guided through an opening in the cover at the combustion-chamber-side end of the pre-chamber spark plug into the main combustion chamber, where the actual combustion of the air-fuel mixture takes place. of combustion for the piston stroke. [0003] During operation of the pre-chamber spark plug, the cap is particularly subject to severe temperature influences. A heat build-up at the cover wou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01T13/54H01T13/16
CPCH01T13/54H01T13/16Y02T10/12
Inventor T·斯泰德滕S·卡斯克B·穆勒U·伊尔马兹
Owner ROBERT BOSCH GMBH
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