JP6742280B2 - Igniter - Google Patents

Description

The present invention relates to an igniter incorporated in an internal combustion engine for a vehicle, for example, an engine of an automobile, which is incorporated in an ignition device for an internal combustion engine which supplies a high voltage to a spark plug to generate spark discharge.

2. Description of the Related Art Conventionally, an igniter having a role of energizing and interrupting a current flowing through an ignition coil is arranged inside an ignition device for an internal combustion engine provided in an engine of an automobile.

1 and 2 are explanatory views showing an ignition device 1 for an internal combustion engine. FIG. 3 is an explanatory view showing a state where the resin-sealed structure igniter 6 is embedded in the coil case 2. An external connection connector 2a is integrated with a coil case 2 of an internal combustion engine ignition device 1, and an external connection connector terminal 2b integrally formed with the coil case 2 is provided and embedded in the coil case 2. The coil 3 and the igniter 5 are electrically connected. The coil 3 and the igniter 5 embedded in the coil case 2 are fixed by a casting resin 4. The igniter 5 constitutes a control circuit by connecting an electronic component 5b such as a switching element to a board 5c forming a printed wiring, and is provided with an internal connection terminal 5a connected to the board in the previous period.

Recently, instead of the substrate 5c for forming a printed wiring, a wiring structure is formed by a thin plate-shaped conductive frame 6c having an internal connection terminal 6b, an electronic component 6d is connected, and a control circuit is provided via a connection wire 6e. A printed circuit is formed by arranging a control circuit in the cavity of the mold, sealing it with a molding resin 6a in a desired shape, and cutting unnecessary tie bars exposed from the molding resin 6a. The resin-sealed structure igniter 6 does not use a substrate to be used.

Japanese Patent Application No. 2009-177303

The resin encapsulation structure igniter 6 is embedded in the coil case 2 and fixed by the casting resin 4. The casting resin narrow portion 4a between the coil case 2 and the igniter has a void when the casting resin 4 is injected. Easy to get involved. Although the voids are removed in the degassing step, the problem is that it takes a lot of time for degassing.

The above problems can be solved by the invention described in the claims.

The resin-sealed structure igniter can be used as an ignition device for an internal combustion engine by having a gradient shape on the outer periphery of the three sides that are connected except one side of the sealing resin shape to expand the effective gap for degassing the casting resin. When built-in, a degassing path connected to the inside of the case in which the resin-sealed igniter is embedded can be provided, and voids caught when the casting resin is injected can be efficiently discharged in the degassing process.

According to the present invention, when the resin-sealed igniter is built in the ignition device for an internal combustion engine, a degassing path can be provided inside the case in which the resin-sealed igniter is embedded, and when the casting resin is injected. The voids trapped in the can be efficiently discharged in the degassing step.

Schematic diagram of ignition coil with built-in igniter Internal detail drawing and supplementary drawing of ignition coil with built-in igniter Conventional resin-sealed structure igniter Example 1 Resin-encapsulated structure igniter and supplementary drawing Detailed view of resin encapsulation structure igniter and coil case and igniter of Embodiment 1 Detailed view of resin encapsulation structure igniter and coil case and igniter of Embodiment 2 Detailed view of resin encapsulation structure igniter and coil case and igniter of Example 3 Detailed view of resin encapsulation structure igniter and coil case and igniter of Example 4 Detailed view of resin encapsulation structure igniter and coil case and igniter of Example 5

Embodiments of the present invention will be described below with reference to FIGS. 4 to 9. FIG. 4 shows an ignition device for an internal combustion engine and an igniter having a role of energizing and interrupting a current flowing in an ignition coil arranged inside the ignition device for an internal combustion engine, which is a thin plate having an internal connection terminal. A conductive frame to form a wiring structure, connect electronic components to form a control circuit via a connecting wire, arrange the control circuit in the cavity of the mold and seal it to the required shape with mold resin, It is a resin sealing structure igniter. FIG. 5 to FIG. 9 show that the sealing resin shape is provided with a shape for expanding a gap effective for degassing the casting resin, and when the resin sealing structure igniter is built in the ignition device for an internal combustion engine, the resin sealing is performed. It is a detailed view showing a deaeration path inside a case in which an igniter is buried.

Example 1 of the present invention will be described with reference to FIGS. 4 and 5.

In this embodiment, as shown in FIG. 4, the resin-sealed structure igniter 6 has internal connection terminals 6b and is mounted on a thin plate-shaped conductive frame 6c forming a wiring structure and a conductive lead frame 6c. The electronic component 6d, the connecting wire 6e for electrically connecting the conductive lead frame 6c and the electronic component 6d, and the mold resin 6 for sealing them.

The resin encapsulation structure igniter 6 has a conductive lead frame 6c on which an electronic component 6d is mounted in a cavity of a mold and seals it with a molding resin 6a into a desired shape, which is exposed from the molding resin 6a. It is formed by cutting tie bars.

Here, the resin-encapsulated structure igniter 6 has a gradient shape 6f formed on at least three sides of the four sides other than the side on which the internal connection terminals 6b project.

As shown in FIG. 5, the resin sealing structure igniter 6 is fixed to the coil case 2 by being inserted from the opening side of the coil case 2 and injecting the casting resin 4 from the opening of the coil case 2 to cure the resin. It

The internal connection terminal 6b projects from the opening of the coil case 2 in order to connect to the connector 2b. Therefore, the side from which the internal connection terminal 6b of the resin-sealed structure igniter 6 projects is provided on the opening side of the coil case 2, and the other three sides are located inside the coil case 2.

According to this embodiment, at least three sides of the resin-sealed igniter 6 other than the side from which the internal connection terminals 6b project, in other words, the continuous side located inside the coil case 2, are effective for deaeration. And the resin sealing structure igniter 6 is provided with a gradient shape 6f for enlarging the gap between the coil case 2 and the igniter when the sealing resin structure igniter 6 is arranged in the coil case. The large-sized cast resin portion 4b is formed on the. As a result, the voids caught when the casting resin 4 is injected can pass through the degassing path 7 connected inside the case by the large casting resin portion 4b, and can be efficiently discharged in the degassing process. You can According to the present embodiment, since degassing can be efficiently performed, degassing time can be suppressed. In addition, since it is possible to suppress staying in the coil case, it is possible to provide a highly reliable ignition coil. Further, voids can be suppressed without increasing the area of the coil case 2, which also contributes to downsizing.

Second Embodiment A second embodiment of the present invention will be described with reference to FIG. The description of the same configuration as that of the first embodiment will be omitted.

In the present embodiment, in addition to the structure of the first embodiment, the resin sealing structure igniter 6 has a surface on the side where the sloped shape 6f of the sealing resin shape is provided and a central portion of the surface on the opposite side, A concave shape 6g for expanding the gap between the coil case 2 effective for degassing the casting resin and the resin sealing structure igniter 6 provided so as to be connected to one of the gradient shapes 6f is provided.

Due to the concave shape 6g, a large casting resin portion 4b is formed between the coil case 2 and the igniter. The voids that are caught when the casting resin 4 is injected pass through the degassing path 7 connected inside the case by the casting resin wide portion 4b and can be efficiently discharged in the degassing process.

A third embodiment of the present invention will be described with reference to FIG.

The difference between this embodiment and Embodiment 2 is that the casting resin wide portion 4b is formed between the coil case 2 and the igniter 6 by the concave shape 6g without forming the gradient shape 6f. Also in this embodiment, the voids that are caught when the casting resin 4 is injected pass through the independent degassing path 7a inside the case formed by the large casting resin portion 4b and are efficiently discharged in the degassing step. You can

FIG. 8 shows a third embodiment of the present invention.

In this embodiment, the resin-sealed structure igniter 6 shown in FIG. 6 is embedded in the coil case 2 and fixed by the casting resin 4. At this time, by providing a gradient shape 6f that is effective for degassing the casting resin on the outer periphery of the two sides where the molding resin 6a is not connected, the casting resin wide portion 4b is formed between the coil case 2 and the igniter. It The voids entrapped when the casting resin 4 is injected pass through the independent degassing path 7a inside the case by the casting resin wide portion 4b, and can be efficiently discharged in the degassing step.

FIG. 9 shows a third embodiment of the present invention.

In this embodiment, the resin-sealed structure igniter 6 shown in FIG. 6 is embedded in the coil case 2 and fixed by the casting resin 4. At this time, a gradient shape 6f that is effective for degassing the casting resin on the outer periphery of the two sides where the molding resin 6a is not connected, and a coil case 2 that is effective for degassing the casting resin at the center of the sealing resin shape. By providing a concave shape 6g for enlarging the gap between the resin encapsulation structure igniter 6 and the coil case 2 and the igniter, a large casting resin portion 4b is formed. The voids entrapped when the casting resin 4 is injected pass through the independent degassing path 7a inside the case by the casting resin wide portion 4b, and can be efficiently discharged in the degassing step.

1 Ignition coil with built-in igniter 2 Coil case 2a Connector for external terminal integrated with case 2b Connector for external connection integrally molded with case 3 Coil 4 Cast resin 4a Cast resin narrow portion between coil case and igniter 4b Coil case Large parts of cast resin between igniters 5 Igniter 5a Internal connection terminals 5b Electronic components 5c Printed wiring board 6 Resin encapsulation structure Igniter 6a Encapsulation resin 6b Internal connection terminals 6c Thin plate conductive frame 6d Electronic components 6e Connection wire 6f Gradient shape effective for degassing the sealing resin part 6g Depressed groove shape effective for degassing the sealing resin part 7 Degassing path connected inside the case 7a Independent degassing path inside the case

Claims (4)

An igniter housed in a coil case of an ignition coil and fixed to the coil case by a casting resin,
An electronic component; a conductive frame having the electronic component mounted thereon and having an internal connection terminal; and a resin portion sealing the electronic component and the frame,
The internal connection terminal protrudes a portion from the resin portion,
The resin portion, three sides other than the sides at least the internal connection terminals projecting, when accommodated in the coil case, the gradient shape to expand the gap between the igniter and the coil case, the resin An igniter having a concave shape connected to the gradient shape at a central portion of the portion . An igniter housed in a coil case of an ignition coil and fixed to the coil case by a casting resin,
An electronic component; a conductive frame having the electronic component mounted thereon and having an internal connection terminal; and a resin portion sealing the electronic component and the frame,
The internal connection terminal protrudes a portion from the resin portion,
The resin part is an igniter having a concave shape formed in a central part thereof so as to form a large casting resin part for enlarging a gap effective for deaeration when housed in the coil case. The igniter according to claim 2 , wherein the two non-connected sides of the resin portion have a sloped shape for expanding a gap effective for degassing the casting resin. An igniter according to any one of claims 1 to 3 ,
An ignition coil, comprising: a coil case that houses the igniter.

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