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Ignition device for IC engine

A technology of ignition device and sealing device, which is applied in the direction of engine ignition, induction energy storage device, spark ignition controller, etc., can solve the problems of difficult assembly process, ignition coil retention, disadvantage, etc.

Inactive Publication Date: 2008-12-17
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the solution is disadvantageous in the sense that
That is, if the sealing force is increased, the assembly process becomes difficult
On the other hand, if the sealing force is designed to be small, the ignition coil can be easily fitted into the plug hole, but not enough to hold the ignition coil firmly in the plug hole

Method used

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  • Ignition device for IC engine
  • Ignition device for IC engine
  • Ignition device for IC engine

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0069] (another modification of the first embodiment)

[0070] Although not shown in the figures, any other modification is possible. For example, figure 2 The sealing device 150 in the illustrated embodiment can be broken down into three separate elements, each having a sealing protrusion 152 thereon. And three annular grooves can be made on the outer peripheral surface of the second enlarged part 22 of the coil housing 1, so that each sealing element 150 will be held by these annular grooves. As a result, the same effects as those of the first embodiment can be obtained.

no. 2 approach

[0072] The following will refer to Figure 5 The second embodiment is introduced with FIG. 6 . Figure 6A shows the situation when the ignition coil 1 is being inserted into the plug hole 101, Figure 6B It shows the situation when the ignition coil 1 is being pulled out from the plug hole 101, wherein, the two-dot dash line represents the state of the sealing device 150 before being inserted into the plug hole 101, and the solid line represents the state of the sealing device before being inserted into the plug hole 101. The state after plug hole 101.

[0073] follow with figure 2 In the same manner as the embodiment, the sealing device 150 in this embodiment includes a cylindrical sealing body 156 and a plurality of sealing protrusions 152 .

[0074] On the outer peripheral surface of the second enlarged portion 22, a plurality (three) of annular casing protrusions 23 are formed in the longitudinal direction. The housing projection 23 is also made asymmetric with respec...

no. 3 approach

[0085] The following will refer to Figure 9 The third embodiment is introduced, which is the same as figure 2 The illustrated embodiment is similar.

[0086] like Figure 9 As shown, a step portion 106 is made on the first cover body 103, so that the diameter of the plug hole 101 formed by the bottom (large diameter portion) of the first cover body 103 is greater than that of the first cover body 103 top (small diameter portion). diameter. The mold for manufacturing the first cover 103 is composed of at least two separate molds, wherein the boundary line of these separate molds corresponds to the stepped portion 106 . Therefore, it is not necessary to provide a corresponding stepped portion on the mold.

[0087] One of the protrusions ( 160 ) of the sealing protrusions 152 is located at the lowermost position, which is made such that the diameter of the outer peripheral end of the lowermost protrusion 160 is slightly larger than the diameters of the other two protrusions...

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PUM

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Abstract

An ignition device for a combustion engine comprises a seal (150) between the coil housing (22) and screw hole (101) firmly holding the ignition coil (1). The seal comprises a cylindrical body at the outer circumference of the screw housing and a ring projection having faces forming different angles with the hole inner surface. Independent claims are also included for six variants of the above for mounting in a combustion engine.

Description

technical field [0001] The invention relates to an ignition device for mounting an ignition coil on an internal combustion engine. Background technique [0002] In common ignition systems for internal combustion engines, a mechanical type power distributor utilizes high voltage cables to selectively deliver secondary high voltage to a plurality of spark plugs. Recently, an independent ignition coil is provided for each spark plug, wherein the ignition coil is directly mounted to the spark plug, thereby simplifying the ignition system and its assembly process. In such conventional ignition systems, that is, ignition systems in which a plurality of ignition coils are mounted to the cylinder head cover, these ignition coils are usually screwed into spark plug holes. [0003] According to the technology in recent years, someone has proposed such a scheme: by canceling the screw assembly structure, the ignition coil is directly installed on the cylinder head cover and the spark ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01T13/06F02P15/00F02P3/02H01F27/02H01F27/06H01F38/12H01T13/04H01T13/44
CPCF02P3/02H01F27/02H01F27/06H01F38/12H01T13/04H01T13/44
Inventor 川井一秀佐藤美孝加藤秀幸
Owner DENSO CORP
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