JP2007242762A - Ignition coil for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ignition coil for internal combustion engine provided with a capacitor for supplying a high voltage to an ignition plug for internal combustion engine of an automobile or the like, and removing noise generated when an arc discharge is generated or improving noise resistance. <P>SOLUTION: The capacitor for removing noise and improving noise resistance is inserted between a drive signal input terminal and a power supply input terminal, in order to alleviate three-dimensional cross of a primary terminal. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an ignition coil for an internal combustion engine provided with a capacitor for removing noise or improving noise resistance when a high voltage is supplied to an ignition plug of an internal combustion engine in an automobile or the like to generate a spark discharge. Is. In particular, the present invention relates to an ignition coil for an internal combustion engine in which the capacitor for removing noise or improving noise resistance is arranged between a drive signal input terminal and a power supply input terminal.

  FIG. 3 is a view for explaining an ignition coil for an internal combustion engine in a conventional example. In FIG. 3, an insulation case 30 for an ignition coil for an internal combustion engine is formed between a connector socket 32, a mounting hole 33 provided on the opposite side of the connector socket 32, and the connector socket 32 and the mounting hole 33. And at least the coil storage portion 31. The coil housing part 31 is provided with a coil assembly 34 composed of a coil and an iron core, an igniter housing part 311, and a capacitor housing part 312.

  The capacitor housing portion 312 is a housing portion for the capacitor 35 and is formed in the insulating case 30 at the same time as the coil housing portion 31. The capacitor housing 312 is provided with a guide 313 for guiding the lead of the capacitor 35. The guide 313 is provided with a groove for guiding the lead of the capacitor 35. The capacitor 35 is inserted into the capacitor housing 312 from the head, and after a pre-formed lead is fitted into the groove of the guide 313, the primary terminals 224 (for example, ground terminals), 225 (for example, Welding to the drive signal input terminal).

FIG. 2 is a conceptual diagram for explaining terminal connection of a capacitor for removing noise or improving noise resistance of an ignition coil for an internal combustion engine in a conventional example. In FIG. 2, the noise removal or noise resistance improving capacitor 212 has a drive signal input terminal 221 connected to a lead 224 and a ground terminal 222 connected to a lead 225. As a result, the drive signal input terminal 221 is three-dimensionally crossed with the drive signal input terminal 221 and the ground terminal 222. That is, in the connection, the three-dimensional intersections 226 and 227 are two places. In addition, an ignition coil for an internal combustion engine in which a capacitor is inserted in a coil housing portion is described in Japanese Patent Application Laid-Open No. 2002-195143.
JP 2002-195143 A

  The solid intersections 226 and 227 may leak without being absorbed by the capacitor. In addition, since the three-dimensional intersections 226 and 227 route the wiring three-dimensionally, there is a drawback that noise leaks to the outside. Further, since the three-dimensional intersections 226 and 227 route the primary terminal, the structure of the routing becomes complicated and there is a drawback that the attaching operation is not easy.

  In order to solve the above problems, the present invention provides a noise removal or noise resistance improving capacitor between the drive signal input terminal and the power input terminal, thereby reducing the routing of the primary terminal and reducing the noise. It is an object of the present invention to provide an ignition coil for an internal combustion engine that can achieve suppression of the above, simple structure, and simplification of assembly work. Another object of the present invention is to provide an ignition coil for an internal combustion engine including a terminal having a shape that is inexpensive and easy to manufacture.

(First invention)
An ignition coil for an internal combustion engine according to a first aspect of the present invention is based on an ignition signal, a primary coil and a secondary coil, an iron core that magnetically couples the primary coil and the secondary coil, and energization and interruption of current in the primary coil. A power switch to perform, a spark plug that generates a spark due to a high voltage generated in the secondary coil, and a capacitor for noise removal or noise resistance improvement, and the capacitor for noise removal or noise resistance improvement Is arranged between the drive signal input terminal and the power supply input terminal.

(Second invention)
In the ignition coil for an internal combustion engine according to the second aspect of the present invention, the capacitor for noise removal or noise resistance improvement according to the first aspect of the invention is such that the drive signal input terminal intersects the ground terminal at one side and the power input terminal is the other terminal. It is characterized by being connected to each.

(Third invention)
In the ignition coil for an internal combustion engine of the third invention, the noise removal or noise resistance improving capacitor of the first or second invention is in tandem with an igniter in an insulating case and parallel to the base of the connector socket. It is arranged.

  According to the present invention, by providing a capacitor for removing noise or improving noise resistance between the drive signal input terminal and the power supply input terminal, it is possible to reduce the routing of the primary terminal, thereby suppressing noise, simplifying the structure, and assembling work. Simplification can be achieved.

  According to the present invention, since the crossing area of the three-dimensional intersection of the primary terminal can be reduced, noise can be removed.

(First invention)
An ignition coil for an internal combustion engine according to a first aspect of the present invention is based on an ignition signal, a primary coil and a secondary coil, an iron core that magnetically couples the primary coil and the secondary coil, and energization and interruption of current in the primary coil. It comprises at least a power switch to be performed, a spark plug that generates a spark by a high voltage generated in the secondary coil, and a capacitor for noise removal or noise resistance improvement. The noise removal or noise resistance improving capacitor is disposed between the drive signal input terminal and the power supply input terminal.

  The present applicant reduces noise even if the capacitor for noise reduction or noise resistance improvement is not disposed between the drive signal input terminal and the ground terminal, but is disposed between the drive signal input terminal and the power input terminal. In addition to being able to do this, we discovered that the number of primary terminals can be reduced and the level crossing can be reduced.

(Second invention)
The capacitor for noise removal or noise resistance improvement according to the second invention is such that the drive signal input terminal is three-dimensionally crossed with the ground terminal and is connected to one terminal, and the power input terminal is connected to the other terminal. It was possible to minimize the three-dimensional intersection of the drive signal input terminal and a part of the ground terminal.

(Third invention)
The capacitor for noise removal or noise resistance improvement according to the third aspect of the invention is arranged in tandem with the igniter in the insulating case and in parallel with the base of the connector socket. In the arrangement relationship of the noise removal or noise immunity improving capacitor, the noise removal or noise immunity improvement capacitor is not only reduced in noise by being arranged between the drive signal input terminal and the power supply input terminal, but also the primary. The number of terminals can be reduced and the number of intersections can be reduced.

  FIG. 1 is a conceptual diagram for explaining terminal connection of a capacitor for removing noise or improving noise resistance of an ignition coil for an internal combustion engine according to an embodiment of the present invention. In FIG. 1, the insulating case 11 includes at least a connector socket 12, an igniter 111, and a capacitor 112 for removing noise or improving noise resistance. The connector socket 12 includes a drive signal input terminal 121, a ground terminal 122, and a power input terminal 123 as primary terminals. In FIG. 1, the coil assembly (primary coil, secondary coil and iron core, etc.), filler, and the like are omitted.

  The drive signal input terminal 121 passes above or below the ground terminal 122 and is connected to one terminal 125 of the capacitor 112 for noise removal or noise resistance improvement. The driving signal input terminal 121 is formed with a three-dimensional overlapping portion 126 at a part of the ground terminal 122 in the wiring. The power input terminal 123 is connected to the other terminal 124 of the capacitor 112 for removing noise or improving noise resistance so as not to overlap three-dimensionally.

  In the embodiment of the present invention, the noise removal or noise resistance improving capacitor 112 is not disposed between the drive signal input terminal 121 and the ground terminal 122, but between the drive signal input terminal 121 and the power input terminal 123. By disposing the noise removal or noise resistance improving capacitor 112, the drive signal input terminal 121 is not routed in a complicated manner, and assembly work can be easily performed. Further, since the drive signal input terminal 121 has few portions that three-dimensionally overlap the ground terminal 122, noise leakage is small.

  As mentioned above, although the Example of this invention was explained in full detail, this invention is not limited to the said Example. The present invention can be modified in various ways without departing from the scope of the claims. For example, well-known or well-known shapes can be employed for the noise removal or noise resistance improving capacitor, terminal, and case material, or internal combustion engine ignition coil and igniter shape in the present embodiment.

In the Example of this invention, it is a conceptual diagram for demonstrating the terminal connection of the capacitor | condenser for noise removal of an internal combustion engine ignition coil, or a noise tolerance improvement. Example 1 It is a conceptual diagram for demonstrating the terminal connection of the capacitor | condenser for noise removal of the internal combustion engine ignition coil in a prior art example, or a noise tolerance improvement. It is a figure for demonstrating the ignition coil for internal combustion engines in a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Insulation case 111 ... Igniter 112 ... Noise removal or noise resistance improvement capacitor 12 ... Connector socket 121 ... Drive signal input terminal 122 ... Grounding terminal 123 ... Power supply input Terminal 124 ... the other terminal (capacitor)
125 ... one terminal (capacitor)
126 ... Overlapping part

Claims (3)

Generated in the secondary coil, a primary coil and a secondary coil, an iron core that magnetically couples the primary coil and the secondary coil, a power switch that conducts and cuts off current in the primary coil based on an ignition signal, and the secondary coil In an internal combustion engine ignition coil comprising at least a spark plug that generates a spark due to a high voltage and a capacitor for noise removal or noise resistance improvement,
The noise removal or noise resistance improving capacitor is:
An ignition coil for an internal combustion engine, which is disposed between a drive signal input terminal and a power input terminal. The noise removal or noise resistance improving capacitor is:
2. The ignition coil for an internal combustion engine according to claim 1, wherein the drive signal input terminal is three-dimensionally crossed with a ground terminal and connected to one terminal, and a power input terminal is connected to the other terminal. The noise removal or noise resistance improving capacitor is:
The ignition coil for an internal combustion engine according to claim 1 or 2, wherein the ignition case is arranged in tandem with the igniter in the insulating case and parallel to the base of the connector socket.

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