JP2007231753A - Ignition coil for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ignition coil for an internal combustion engine supplying high voltage to a spark plug of the internal combustion engine in an automobile or the like and having a capacitor for removing noises generated when spark discharge is caused or for improving noise tolerance. <P>SOLUTION: The capacitor for removing noise or improving noise tolerance, when made as a chip capacitor, dispenses with severe forming and therefore an automatic assembling machine for installation may be easily adopted. A terminal for mechanical support and electrical connection of the chip capacitor comprises a placement part and a holding part of the chip capacitor. The chip capacitor has no lead, is placed on the placement part, does not move from a predetermined position due to the holding part even in existence of vibrations caused by transportation or the like and can be correctly installed. <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 internal combustion engine ignition coil provided with a terminal that facilitates positioning or temporary fixing of a capacitor.

  In the present invention, by using a chip capacitor as the capacitor, it is possible to obtain an ignition coil for an internal combustion engine that is easy to position or temporarily fix and is inexpensive. In this specification, a “chip capacitor” is a small rectangular or cylindrical capacitor that is provided with an electrode on a capacitor element and is suitable mainly for surface mounting, and generally does not have a lead wire.

  2 (a) to 2 (d) are views for explaining the forming of capacitor leads connected to the terminals of the ignition coil for an internal combustion engine in the conventional example. In FIG. 2A, the capacitor 21 is connected to a terminal extending from the connector by widening the lead 22 'to a predetermined interval. 2 (b) to 2 (d), the capacitor 21 is formed into a shape that matches the shape of the lead 22 'with the terminal extending from the connector.

  FIGS. 3A to 3C are views for explaining the attachment of the noise prevention capacitor of the ignition coil for the internal combustion engine in the conventional example. The internal combustion engine ignition coil case 30 in FIG. 3A is molded between a connector socket 301, a mounting hole 302 provided on the opposite side of the connector socket 301, and between the connector socket 301 and the mounting hole 302. The coil storage portion 303 is at least configured. The coil storage unit 303 includes a coil and iron core 304, an igniter storage unit 305, and a capacitor storage unit 306.

  3B and 3C, the capacitor housing portion 306 is a housing portion for the capacitor 21, and is formed in the case 30 at the same time as the coil housing portion 303. The capacitor housing 306 is provided with a guide 32 for guiding the lead 22 ′ of the capacitor 21. The guide 32 is provided with a groove for guiding the lead 22 ′ of the capacitor 21.

The capacitor 21 is inserted into the capacitor housing portion 306 from the head, and a pre-formed lead 22 ′ is fitted into the groove of the guide 32, and then welded to the terminals 31 and 31 ′. In addition, an ignition coil for an internal combustion engine in which the capacitor 21 is inserted in the coil housing portion 303 is described in Japanese Patent Application Laid-Open No. 2002-195143.
JP 2002-195143 A

  However, the lead 22 'of the capacitor 21 needs to be formed in advance at a predetermined interval and shape in order to electrically connect and position the terminals 31 and 31'. Further, the forming needs to be matched with the shape of the guide 32, and requires severe dimensions, so that there is a problem that the cost becomes high. The internal combustion engine ignition coil may use, for example, an automatic assembly machine when assembling a coil assembly, an igniter, a capacitor, and the like. In such a case, the capacitor 21 needs to be temporarily fixed. However, the capacitor 21 could not be temporarily fixed to the terminals 31 and 31 '.

  In order to solve the above-described problems, an object of the present invention is to provide an ignition coil for an internal combustion engine including a terminal having a shape capable of positioning and temporarily fixing a capacitor. 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 composed of a chip capacitor.

(Second invention)
The ignition coil for an internal combustion engine according to the second invention is characterized in that the terminal for mechanical support and electrical connection of the chip capacitor in the first invention has a shape capable of positioning and temporarily fixing the chip capacitor. To do.

(Third invention)
In the ignition coil for an internal combustion engine of the third invention, the terminal for mechanical support and electrical connection of the chip capacitor in the first invention or the second invention comprises a mounting part for the chip capacitor and a holding part. It is characterized by being.

(Fourth invention)
In the ignition coil for an internal combustion engine of the fourth invention, the terminals for mechanical support and electrical connection of the chip capacitor in the first to third inventions are connected to the upright piece connected to the primary terminal and the upright piece. A bent piece that is bent, and a mounting piece that is connected to the bent piece and that mounts the chip capacitor, and that is connected to the mounting piece and holds the chip capacitor. And a holding piece to be held.

(Fifth invention)
An ignition coil for an internal combustion engine according to a fifth aspect of the present invention is based on an ignition signal 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, an ignition plug that generates sparks due to the high voltage generated in the secondary coil, and a capacitor for noise removal or noise resistance improvement, and an upright piece connected to the primary terminal, A capacitor machine comprising a bent piece that is continuous with the upright piece and a mounting piece that is continuous with the bent piece and has an opening into which the lead of the capacitor can be inserted. It is characterized by having a terminal for supporting and electrically connecting.

  According to the present invention, since the capacitor can be positioned or temporarily fixed, lead forming is unnecessary, and an inexpensive ignition coil for an internal combustion engine can be obtained.

  According to the present invention, the capacitor is a chip capacitor, and the terminal for mounting or holding the chip capacitor is provided, whereby an inexpensive ignition coil for an internal combustion engine can be obtained compared to a capacitor having a lead.

  According to the present invention, since it is not necessary to form the capacitor lead, it is possible to provide an ignition coil for an internal combustion engine that is inexpensive and easy to assemble.

  According to the present invention, since the capacitor can be held or positioned by the terminal, the guide portion is unnecessary, and the ignition coil for an internal combustion engine can be provided with a simple structure and at a low cost.

(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. When the capacitor for noise removal or noise resistance improvement is a chip capacitor, severe forming is not necessary, and therefore an automatic assembly machine for mounting can be easily employed.

(Second invention)
In the ignition coil for an internal combustion engine according to the second aspect of the present invention, the terminals for mechanical support and electrical connection of the chip capacitor according to the first aspect of the present invention can be positioned and temporarily fixed with a simple shape because the chip capacitor has no lead. Become.

(Third invention)
In the ignition coil for an internal combustion engine of the third invention, the terminal for mechanical support and electrical connection of the chip capacitor in the first and second inventions comprises a mounting part for the chip capacitor and a holding part. Yes. Since the chip capacitor does not have a lead, it is mounted on the mounting portion and can be correctly mounted without being moved from a predetermined position even if the holding portion vibrates due to conveyance or the like.

(Fourth invention)
In the ignition coil for an internal combustion engine of the fourth invention, the terminals for mechanical support and electrical connection of the chip capacitors of the first to third inventions are an upright piece, a bent piece, a mounting piece, and a holding piece. One piece is configured as a pair. The upright piece is connected to stand upright from the primary terminal. The bent piece is connected to the upright piece and is bent so as to be folded back. The bent piece not only corresponds to the length of the chip capacitor depending on the angle at the time of folding, but also in the length direction of the chip capacitor. Movement can be eliminated.

  The placing piece connected to the bent piece has a surface on which the chip capacitor can be placed. The holding piece is connected to the mounting piece, and holding the chip capacitor, the lateral movement of the chip capacitor can be eliminated. By positioning the mounting piece and the holding piece along the outer shape of the chip capacitor, the chip capacitor can be easily positioned and temporarily fixed.

(Fifth invention)
The ignition coil for an internal combustion engine of the fifth invention differs from the first invention in that the capacitor for removing noise or improving noise resistance is a capacitor having a lead instead of a chip capacitor. A terminal that performs mechanical support and electrical connection of the capacitor is composed of a pair of an upright piece, a bent piece, and a mounting piece. The upright piece is connected to a primary terminal. The bent piece is connected to the upright piece and is bent at a predetermined angle. The distance of the said terminal can be adjusted with the bending angle of the said bending piece.

  The mounting piece connected to the bent piece is provided with an opening through which the capacitor lead can be inserted. The lead of the capacitor can be positioned and temporarily fixed by being inserted into the opening, and the mounting strength can be increased by inserting solder or the like between the lead and the opening. . The terminals for mechanical support and electrical connection of the capacitor do not need to form the lead of the capacitor, and can be easily attached by adjusting the angle of the bent piece.

  FIGS. 1A to 1C are views for explaining a state in which a capacitor for removing noise or improving noise resistance is attached to a terminal in an ignition coil for an internal combustion engine according to a first embodiment of the present invention. Although the ignition coil for an internal combustion engine of the present invention is not shown, 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 are provided. It comprises at least a power switch based on an ignition signal, an ignition plug that generates sparks by a high voltage generated in the secondary coil, and a capacitor for noise removal or noise resistance improvement.

  In FIG. 1A, a chip capacitor 11 for noise removal or noise resistance improvement is composed of a capacitor 111 and electrodes 112 and 113 provided at both ends of the capacitor 111. In FIG. 1 (b), a pair of terminals 12 extended to a connector primary terminal (not shown) includes an upright piece 121, a bent piece 122, a placing piece 123, and holding pieces 124 and 124 '. It is composed of The upright piece 121 extending to the connector primary terminal is bent at the top, and is connected to the mounting piece 123 via the bent piece 122. Further, the mounting piece 123 is formed with holding pieces 124 and 124 ′ that stand from both sides and hold the electrode portion of the chip capacitor 11.

  The bent piece 122 can be adapted to the length of the chip capacitor 11 by changing the bending angle. In addition, the shape of the mounting piece 123 and the holding pieces 124 and 124 ′ is formed so as to match a square shape, a cylindrical shape, or the like depending on the shape of the chip capacitor 11. The square chip capacitor 11 in FIG. 1 (c) is shown in a state where the electrodes at both ends thereof are connected to the terminals 12 and 12 '.

  FIG. 1 (d) is a diagram for explaining a state in which a capacitor for removing noise or improving noise resistance is attached to a terminal in an ignition coil for an internal combustion engine according to a second embodiment of the present invention. It is a figure to do. In FIG. 1 (d), the pair of terminals 12, 12 ′ is composed of an upright piece 121, a bent piece 122, and a placement piece 123. The upright piece 121 extending to the connector primary terminal is bent at the top, and is connected to the mounting piece 123 via the bent piece 122. Further, the mounting piece 123 has openings 125 and 125 ′ for inserting leads of capacitors (not shown) on the mounting surface.

  The bent piece 122 can be made to correspond to the lead interval d of the capacitor by changing the bending angle. The capacitor is soldered after the lead 22 is inserted into the openings 125 and 125 '. Since the openings 125 and 125 'are formed so as to have a certain margin between the leads 22, solder can enter and can be firmly fixed. Further, the capacitor lead 22 does not need to be formed, and the distance d can be easily adjusted by the terminals 12 and 12 '.

  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, the capacitor, the internal combustion engine ignition coil, the terminal, and the case in the present embodiment may be made of known or known materials.

(A) to (c) are diagrams for explaining a state in which a capacitor for removing noise or improving noise resistance is attached to a terminal in an internal combustion engine ignition coil according to a first embodiment of the present invention. (Embodiment 1) FIG. 1 (d) is a diagram for explaining a state in which a capacitor for removing noise or improving noise resistance is attached to a terminal in an ignition coil for an internal combustion engine according to a second embodiment of the present invention. It is a figure explaining a capacitor | condenser with a lead. (Example 2) (A)-(d) is a figure for demonstrating forming of the capacitor | condenser lead connected to the terminal of the ignition coil for internal combustion engines in a prior art example. (A) to (C) are diagrams for explaining the attachment of the noise prevention capacitor of the ignition coil for the internal combustion engine in the conventional example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Chip capacitor 111 ... Capacitor 112, 113 ... Electrode 12, 12 '... Terminal 121 ... Upright piece 122 ... Bending piece 123 ... Mounting piece 124, 124' ... Hugs 125, 125 '... Open

Claims (5)

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 internal combustion engine ignition coil, wherein the noise removal or noise resistance improving capacitor comprises a chip capacitor.   2. The ignition coil for an internal combustion engine according to claim 1, wherein a terminal for mechanically supporting and electrically connecting the chip capacitor has a shape capable of positioning and temporarily fixing the chip capacitor. 3. Terminals for mechanical support and electrical connection of the chip capacitor are:
The ignition coil for an internal combustion engine according to claim 1 or 2, further comprising a mounting portion for the chip capacitor and a holding portion. Terminals for mechanical support and electrical connection of the chip capacitor are:
An upright piece connected to the primary terminal;
The bent piece is connected to the upright piece, and is bent.
A mounting piece that is connected to the bent piece and on which the chip capacitor is placed,
A holding piece connected to the mounting piece and holding the chip capacitor;
The ignition coil for an internal combustion engine according to any one of claims 1 to 3, further comprising: 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,
An upright piece connected to the primary terminal;
The bent piece is connected to the upright piece, and is bent.
A mounting piece that is connected to the bent piece and has an opening into which the lead of the capacitor can be inserted;
An ignition coil for an internal combustion engine, comprising a terminal for mechanically supporting and electrically connecting a capacitor composed of:

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