JP2006291789A - 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 for generating arc discharge while thinning thickness of a coil part case to reduce weight and cost. <P>SOLUTION: An igniter is made to keep a longitudinal direction thereof in parallel with an opening surface of a coil part case and is installed perpendicularly to an insertion direction of a connector inserted in a connector part to thin thickness of the coil part case. Since insertion of the igniter in the coil part case makes thickness of the coil part case thin, not only miniaturization/weight reduction but also reduction of quantity of insulation resin filled in the coil part case can be reduced. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an ignition coil for an internal combustion engine that can supply a high voltage to generate spark discharge in an automobile engine spark plug, and at the same time reduce the thickness of the coil part case to reduce the weight and cost. It is.

FIG. 5 is a conceptual top view for explaining a coil case in a conventional ignition coil for an internal combustion engine. 6 is a cross-sectional view of the ignition coil for the internal combustion engine in FIG. 5 and 6, the coil part case 5 accommodates therein a primary coil 1 and a secondary coil 2 and an iron core 3 that magnetically couples the two coils. The end of the coil is welded to the welding terminal 9. The coil part case 5 is arranged so that the longitudinal direction of the igniter 4 is the depth direction of the coil part case 5. An igniter lead 41 of the igniter 4 is welded to the welding terminal 9. The internal combustion engine ignition coil is described in detail in Japanese Patent Application Laid-Open No. 2003-45730.
JP 2003-45730 A

  In the conventional igniter, since the longitudinal direction of the igniter is arranged in the depth direction of the coil case, not only the connection of the igniter lead and the coil welding terminal is facilitated, but also a sufficient work space is provided. By taking it, productivity could be improved. On the other hand, the conventional igniter has a problem that the height of the coil case is increased because the welding position is increased, and the amount of insulating resin filled therein is increased. In addition, the conventional igniter has a limit in providing an ignition coil for an internal combustion engine that satisfies the conditions of small size, light weight, and low profile because the height of the coil case is high.

  In order to solve the above-described problems, the present invention reduces the size, weight, and height of the igniter by making the longitudinal direction of the igniter horizontal to the coil case and perpendicular to the connector insertion direction. An object of the present invention is to provide an ignition coil for an internal combustion engine that satisfies the following conditions.

(First invention)
An ignition coil for an internal combustion engine according to a first aspect of the present invention includes a primary coil and a secondary coil, an iron core that magnetically couples the primary coil and the secondary coil, a coil case that accommodates the coil, the iron core, and the like, and the coil At least a igniter that is energized and cut off according to an ignition signal, and a connector part that has a connector connected to the coil. The igniter has a longitudinal direction of the coil part case. It is characterized by being installed so as to be parallel to the opening surface and perpendicular to the insertion direction of the connector to be inserted into the connector portion.

(Second invention)
An ignition coil for an internal combustion engine according to a second aspect of the present invention includes a side opening provided at a position where the igniter is disposed at a side of the coil part case according to the first aspect, and a side closing the side opening. It has the part opening part cover, It is characterized by the above-mentioned.

(Third invention)
An ignition coil for an internal combustion engine according to a third aspect of the present invention is a coil part case in which the primary coil, secondary coil, iron core, etc. of the first aspect are accommodated, and a connector part that accommodates the igniter and has a connector connected to the outside. Are configured to be separable.

  According to the present invention, the longitudinal direction of the igniter is set to be parallel to the opening surface of the coil part case, and is installed so as to be perpendicular to the insertion direction of the connector inserted into the connector part. Not only can the thickness of the coil case be reduced, the size and height can be reduced, but the amount of insulating resin filled in the case can be reduced to reduce the weight.

(First invention)
An ignition coil for an internal combustion engine according to a first aspect of the present invention includes a primary coil and a secondary coil, an iron core that magnetically couples the primary coil and the secondary coil, a coil case that houses the coil, the iron core, and the like, and the coil An igniter that is housed in the case and controls energization / cutoff of the primary current according to the ignition signal, and a connector having a connector connected to the coil. In order to reduce the thickness of the coil part case, the igniter has a longitudinal direction parallel to the opening surface of the coil part case, and the insertion direction of the connector inserted into the connector part. It is installed to be vertical. The insertion of the igniter into the coil part case can reduce the thickness of the coil part case, so that not only can the size and weight be reduced, but also the amount of insulating resin filled in the case can be reduced.

(Second invention)
In the ignition coil for an internal combustion engine of the second invention, since the height is shortened, it is difficult to weld the igniter lead and the coil lead. Therefore, a side opening is provided at a position where the igniter is arranged on the side of the coil case in the first invention, so that the welding can be easily performed at the side opening. Further, the side opening is provided with a side opening cover that closes the side opening so that the filled insulating resin does not leak to the outside.

(Third invention)
The ignition coil for an internal combustion engine according to the third aspect of the invention is configured so that a coil part case in which a coil, an iron core and the like are accommodated, and a connector part in which an igniter and the like are accommodated can be divided. First, the coil lead and the welding terminal are welded. Thereafter, the welding terminal and the igniter lead are welded. With the connection as described above, not only can the coil part case and the connector part be produced separately, but also the welding of the respective parts can be facilitated.

  FIG. 1 is a conceptual top view for explaining a coil part case in an ignition coil for an internal combustion engine according to the present invention. FIG. 2 is an AA arrow view of the internal combustion engine ignition coil in FIG. 1 and 2, the coil case 5 houses therein a primary coil 1 and a secondary coil 2 and an iron core 3 that magnetically couples the two coils 1 and 2. The welding terminal 9 is welded to the igniter lead 41. The igniter 4 has a coil portion so that the longitudinal direction of the igniter 4 is parallel to the opening surface 51 of the coil portion case 5 and perpendicular to the insertion direction of the connector inserted into the connector portion 6. It is installed in the case 5. Since the arrangement of the igniter 4 with respect to the coil part case 5 lowers the welding position, the height of the coil part case 5 can be reduced.

  The welding terminal 9 and the igniter lead 41 are welded to each other. Further, the coil case 5 is provided with a side opening 521 at a position where the igniter 4 of the side 52 is disposed. The side opening 521 facilitates the welding operation between the welding terminal 9 and the igniter lead 41. The side opening 521 is provided with a side opening cover 522 so that the insulating resin filled from the coil case 5 does not leak.

  FIG. 3 is a conceptual top view for explaining a coil case in an internal combustion engine ignition coil according to another embodiment of the present invention. 4 is a BB arrow view of the internal combustion engine ignition coil in FIG. 3 and 4, the installation direction of the igniter 4 is the same as in FIGS. 1 and 2. The difference from the first embodiment is that after welding the coil lead 9 'to the welding terminal 10 of the coil, the welding terminal 10 and the igniter lead 42 are welded. Since the welding lead 10 can separate the coil lead 9 ′ and the igniter lead 42, attachment work is facilitated.

  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. As the primary and secondary coils, the iron core, the filling insulating resin, the case, the connector, and the like described in the embodiment of the present invention for the ignition coil for an internal combustion engine, those of known or known materials and shapes can be used. The igniter having a known or well-known structure and shape can be used.

It is a conceptual top view for demonstrating the coil part case in the ignition coil for internal combustion engines of this invention. Example 1 It is an AA arrow line view of the ignition coil for internal combustion engines in FIG. It is a conceptual top view for demonstrating the coil part case in the ignition coil for internal combustion engines in the other Example of this invention. (Example 2) It is a BB arrow line view of the ignition coil for internal combustion engines in FIG. It is a conceptual top view for demonstrating the coil part case in the conventional ignition coil for internal combustion engines. It is CC sectional drawing of the ignition coil for internal combustion engines in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Primary coil 2 ... Secondary coil 3 ... Iron core 4 ... Igniter 41, 42 ... Igniter lead 5 ... Coil part case 51 ... Opening surface 52 ... Side part 521 ... Side opening 522 ... Side opening cover 6 ... Connector part 9 ... Welding terminal 9 '... Coil lead 10 ... Welding terminal 16 ... Plug hole

Claims (3)

A primary coil and a secondary coil;
An iron core for magnetically coupling the primary coil and the secondary coil;
A coil part case for housing the coil and iron core, and the like;
An igniter that is housed in the coil part case, and controls energization / cutoff of the primary current according to the ignition signal;
A connector portion having a connector connected to the coil;
In an ignition coil for an internal combustion engine having at least
The internal combustion engine characterized in that the igniter is installed so that a longitudinal direction thereof is parallel to an opening surface of the coil part case and perpendicular to an insertion direction of a connector to be inserted into the connector part. Ignition coil. In the side part of the coil part case, a side opening provided at a position where the igniter is disposed,
A side opening cover for closing the side opening;
The ignition coil for an internal combustion engine according to claim 1, characterized by comprising: A coil part case in which the primary coil, secondary coil, iron core, etc. are housed;
A connector portion that houses the igniter and has a connector that connects to the outside;
The internal combustion engine ignition coil according to claim 1, wherein the internal combustion engine ignition coil is configured to be separable.

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