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Ignition coil

A technology for high-voltage joints and spark plugs, which is applied in the direction of spark plugs, transformer/coil connectors, connections, etc., can solve the problems of high manufacturing costs, increase the diameter of the protective cover, and reduce the flexibility of the protective cover, so as to save manufacturing costs and reduce materials. , The effect of reducing manufacturing costs

Inactive Publication Date: 2011-04-13
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the metal sleeve leads to more expensive manufacturing and increases the diameter of the protective cover
In addition, the flexibility of the protective cover is reduced by the metal sleeve

Method used

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Examples

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Comparison scheme
Effect test

Embodiment Construction

[0016] The figure shows a simplified representation of an ignition coil according to the invention in a sectional view.

[0017] The ignition coil generates the high voltage required for the spark discharge at the spark plug.

[0018] The ignition coil has a coil housing 1 in which a primary coil 2 and a secondary coil 3 cooperate in such a way that the high voltage of the spark plug 5 is generated from the low DC voltage of the battery 4 . Primary coil 2 can be electrically connected via low-voltage connection 8 to battery 4 and via high-voltage connection 9 to spark plug 5 . The high-voltage connection 9 is formed, for example, as a dome which protrudes from the coil housing 1 . The spark plug 5 is usually arranged in a shaft 10 of a cylinder head 11 of the internal combustion engine.

[0019] The ignition coil is designed as a so-called compact ignition coil, whose coil housing 1 is arranged outside the shaft 10 and whose high-voltage connection 9 is connected to the spar...

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PUM

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Abstract

Known ignition coils have a high-voltage connection, a spring for electrically connecting the high-voltage connection to a spark-plug and an elastic protective jacket that surrounds the spring. The windings of the spring lie in a block against one another in a block section that faces the high-voltage connection and are interspaced in a spring section designed to contact the spark-plug. To permitthe ignition coil with the elastic protective jacket to be pushed easily onto the spark-plug, said protective jacket is reinforced by the integration of two metal sleeves. However, the disadvantage of these sleeves is that they involve higher production costs and increase the diameter of the protective jacket. In addition, the sleeves reduce the flexibility of the protective jacket. In the ignition coil according to the invention, the rigidity of the protective jacket is increased without additional components, thus cutting production costs and reducing the diameter of the protective jacket. According to the invention, the end of the block section (15.1) of the spring (15), facing the spring section (15.2), is supported on at least one support shoulder (20) of the protective jacket (16).

Description

technical field [0001] The invention relates to an ignition coil according to the preamble of claim 1 . Background technique [0002] US 5,357,233 already discloses an ignition coil having a high-voltage connection, a spring for electrically connecting the high-voltage connection to the spark plug, and an elastic protective cover surrounding the spring. The turns of the spring lie against one another in the press-fit turn section facing the high-voltage connection so that the press-fit turns are spaced apart from each other in the spring section for contacting the spark plug. The high-voltage connection is inserted into the spark plug shaft of the engine together with the elastic boot. In order to conveniently insert the ignition coil and the elastic protective cover on the spark plug, the protective cover is reinforced by integrating two metal sleeves. Disadvantages are that the metal sleeve leads to more expensive production and increases the diameter of the protective c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02P3/02H01F38/12H01R13/24
CPCH01F27/04H01R2201/22H01F38/12H01R13/53F02P3/02H01R13/2421H01T13/44
Inventor W·斯坦伯格
Owner ROBERT BOSCH GMBH
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