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Spark plug comprising a rounded insulator base portion

An insulator and spark plug technology, applied in the field of spark plugs, can solve problems such as cylinder failure and spark plug insulator breakage.

Active Publication Date: 2021-07-23
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to these pressure peaks in a severe knock event, the insulator of the spark plug may rupture and may cause failure of the cylinder in which the damaged spark plug is installed

Method used

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  • Spark plug comprising a rounded insulator base portion
  • Spark plug comprising a rounded insulator base portion
  • Spark plug comprising a rounded insulator base portion

Examples

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Embodiment Construction

[0032] figure 1 A generally known spark plug 1 is shown in half section. This schematic is used to introduce and separate the various components and sections of the spark plug from each other. exist figure 2 The embodiments shown in to 4 for insulator bases with roundings according to the invention can be applied according to figure 1 of spark plugs.

[0033] The spark plug 1 includes a housing 2 . An insulator 3 is inserted into the housing 2 . The housing 2 and the insulator 3 each have a bore and each have a longitudinal axis which coincides with the central axis 8 of the spark plug. A center electrode 4 is inserted into the insulator 3 . Furthermore, connecting bolts 5 are inserted in said insulator 3 . The resistance element 6 in the insulator 3 is located between the central electrode 4 and the connecting bolt 5 . The resistor element 6 electrically conductively connects the central electrode 4 to the connection pin 5 . On the side facing the combustion chamber...

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Abstract

The invention relates to a spark plug comprising a housing (2), an insulator (3), a centre electrode (4), and a ground electrode (7) located at a combustion-chamber end of the housing. The insulator has an insulator collar (32), an insulator base (34), and a transition region (33) which lies on a shoulder (22) of the housing. A breathing space (50) is formed at the combustion-chamber end of the spark plug and is delimited by a portion (24) of the interior of the housing and a portion (348) of the insulator base. The portion of the insulator base has a (rounded portion 345) having a first side length (L1) and a second side length (L2 < L1) angled with respect to the first side length, wherein the first side length extends between the point at which the side lengths intersect and a first end point (346) of the rounded portion and the second side length extends between the point of intersection and a second end point (347) of the rounded portion. The rounded portion can also be used with a prechamber spark plug.

Description

technical field [0001] The invention relates to a spark plug according to claim 1 and a prechamber spark plug according to claim 10 . Background technique [0002] In today's internal combustion engines in the automotive industry, the tendency is for higher and higher pressures and thus also higher temperatures to occur in the corresponding combustion chambers of the cylinders. Higher power is achieved through this highly supercharged internal combustion engine. The higher pressures and higher temperatures in the combustion chamber also increase the demands placed on individual components, such as, for example, the spark plug. Therefore, spark plugs are not only subjected to the pressure, temperature and chemical conditions of normal operation of the internal combustion engine, but also to extreme conditions when abnormal events occur in the internal combustion engine. One of these abnormal events is premature ignition (Vorentflammung). [0003] During normal ignition dur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01T13/20H01T13/36
CPCH01T13/20H01T13/36H01T13/32H01T13/54
Inventor S·卡斯柯S·苏布考M·布兰科梅斯特F·特劳布
Owner ROBERT BOSCH GMBH
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