Ignition coil device for internal combustion engine
An ignition coil and internal combustion engine technology, which is applied to engine ignition, induction energy storage devices, spark ignition controllers, etc., can solve the problems that hinder the miniaturization and complexity of ignition coil devices for internal combustion engines, and achieve superior waterproofness and miniaturized manufacturing. , the effect of simple structure
Inactive Publication Date: 2007-05-23
HITACHI LTD
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Problems solved by technology
[0009] However, in the above conventional ignition coil device for an internal combustion engine, in order to ensure waterproofness, as described above, it is necessary to form the first to third grooves and space portions, and to form the vent holes (air passages) in a complicated labyrinth structure. , the structure of the waterproof sealing rubber between the ignition coil and the spark plug hole or the coil case becomes complicated and large, which hinders the miniaturization of the ignition coil device for internal combustion engines
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[0032] Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0033] FIG. 1 is a cutaway schematic configuration diagram of main parts of an ignition coil device for an internal combustion engine according to a first embodiment of the present invention. In addition, in FIG. 1, the part along the line A-A becomes a cross section of main parts.
[0034] In FIG. 1 , a ring-shaped seal rubber 2 is attached to the lower side (in FIG. 1 ) of the ignition coil device 1 inserted into an insertion portion of a spark plug hole (not shown) formed in the cylinder head. A part of the seal rubber 2 is provided with an annular convex portion 2a, and the waterproofness is ensured by the convex portion 2a being press-contacted to the inner surface of the spark plug hole 8 . An intake hole inlet 4 a is formed between the opening of the spark plug hole 8 and the ignition coil device 1 .
[0035] A substantially L-shaped groove forming an air passa...
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An ignition coil device for an internal combustion engine, having excellent water proofing property, capable of being reduced in size, and easily produced. Annular seal rubber (2) is installed on the lower side of an ignition coil device (1). An annular projection section (2a) is provided on a part of the seal rubber and is pressed against the inner diameter surface of a plug hole. A substantially L-shaped groove forming an air path (4) is provided in a part of a coil case (1a). The air path (4) is formed by installing the seal rubber (2) in the groove, enabling the inside and the outside of the plug hole to communicate with each other. A thin film resin member (3) with a porous structure that is permeable to gas but not to liquid is adhered and fixed to an entrance (4a) of the air path (4) to prevent water from entering into the plug hole. This way, an ignition coil device for an internal combustion engine, having excellent water proofing property, capable of being reduced in size, and easily produced can be realized.
Description
technical field [0001] The present invention relates to an ignition coil device for an internal combustion engine mounted on each ignition plug of the internal combustion engine. Background technique [0002] An ignition coil device for an internal combustion engine is inserted into a plug hole formed in a cylinder head and connected to an ignition plug. When the ignition coil device is inserted into the plug hole, or when the air in the plug hole thermally expands with the operation of the internal combustion engine, it is necessary to discharge the air from the inside of the plug hole to the outside. [0003] For this reason, a vent hole (groove) communicating the inside and outside of the plug hole is formed in the ignition coil device, but it is necessary to prevent water from entering the plug hole from the outside through the vent hole. [0004] Therefore, in the technology described in Patent Document 1, in order to prevent water from infiltrating into the spark plug...
Claims
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IPC IPC(8): F02P15/00H01F38/12
CPCF02P3/02H01F27/06H01F38/12
Inventor 安藏洋一高桥真喜男小林贵信
Owner HITACHI LTD