JP5091002B2 - Ignition coil for internal combustion engine - Google Patents

Description

  The present invention relates to an ignition coil for an internal combustion engine for supplying a high voltage to an ignition plug of an internal combustion engine such as an automobile to generate a spark discharge, and in particular, the position of a lead portion of the igniter is not shifted, and The present invention relates to an ignition coil for an internal combustion engine that can reliably connect a lead portion and an external terminal by welding, soldering, or the like.

  In general, an ignition coil for an internal combustion engine forms an electromagnetic circuit with a primary coil, a secondary coil, and an iron core, and controls the conduction and blocking of the primary coil by an igniter, thereby exciting the magnetic flux generated in the formed electromagnetic circuit. Is greatly changed to increase the counter electromotive force generated by the electromagnetic induction by the turn ratio of the primary coil and the secondary coil, and a high voltage is generated in the secondary coil. The secondary coil supplies the spark plug of the internal combustion engine.

For this reason, as shown in FIG. 3, the conventional ignition coil 1 for an internal combustion engine includes a primary coil (not shown) for forming an electromagnetic circuit in an insulating case 2 and an illustration provided on the outside of the primary coil. At least a secondary coil that is not shown, and an iron core (not shown) that is disposed inside the secondary coil and the primary coil and magnetically couples these coils. Furthermore, an igniter case 4 that houses an igniter 3 that controls conduction to and disconnection from the primary coil is fitted into the insulating case 2, and an insulating resin (not shown) is injected into the insulating case 2 and hardened. Necessary insulation is maintained.
The igniter 3 has a lead portion 3a composed of three terminals and a mold portion 3b. One of the three terminals of the lead portion 3a is connected to one end of the primary coil, and the lead portion 3a is an igniter case. 4 is connected to an external terminal 4 a included in the connector case part 41 of 4 and accommodated in the igniter accommodating part 42 of the igniter case 4. The igniter case 4 includes the connector case portion 41, a mold portion storage portion 421 that is connected to the connector case portion 41 and stores the mold portion 3 b of the igniter 3, and a lead portion that stores the lead portion 3 a of the igniter 3. The igniter accommodating part 42 which consists of the accommodating part 422 is comprised.

The circuit board on which the igniter 3, an ion current detection circuit for detecting an ion current generated by combustion of the air-fuel mixture, and a processing circuit for processing a signal indicating the ion current detected by the ion current detection circuit are formed. Is disclosed in Japanese Patent Application Laid-Open No. 2004-228688, in which an ignition coil for an internal combustion engine with improved accuracy in determining misfire of the internal combustion engine by reliably detecting an ionic current is housed in an insulating case. ing.
JP 2003-83220 A

  Here, in the conventional ignition coil 1 for an internal combustion engine, when the igniter 3 is accommodated in the igniter accommodating portion 42 of the igniter case 4 while the lead portion 3a is connected to the external terminal 4a, the mold portion 3b of the igniter case 4 is In particular, the igniter 3 is positioned by being housed so as to be in contact with the inner surface of the mold portion housing portion 421 of the igniter housing portion 42. For this reason, as shown in FIG. 4, the lead part 3a of the igniter 3 may be welded or soldered due to the backlash of parts such as tolerance, and the connection with the external terminal 4a may be shifted, which may cause poor connection. There was a problem that there was.

  Therefore, the present invention has been proposed in view of the above circumstances, and by positioning the igniter so as to ensure the connection between the lead part of the igniter and the external terminal, welding between the lead part of the igniter and the external terminal, An object of the present invention is to provide an ignition coil for an internal combustion engine that can reliably perform connection by soldering or the like, eliminate the possibility of causing connection failure, and contribute to quality improvement.

In order to achieve the above object, the present invention provides a mold part housing part for housing an igniter mold part, an igniter housing part comprising a lead part housing part for housing the lead part of the igniter, and the igniter housing part. It is continuously provided, and a connector case portion with an external terminal for connecting the igniter to an external power source, have a, one end of the external terminals from the connector case portion to the lead portion housing portion of the igniter receiving portion In the ignition coil for an internal combustion engine having an igniter case that protrudes and connects the lead portion of the igniter to one end thereof, a protrusion is provided on the inner surface of the igniter case facing the lead portion storage portion. wherein one of the igniter, and positioning the lead portion connected to said external terminal, to characterized in that the .

In an internal combustion engine ignition coil according to the present invention, a projection provided on opposing inner surfaces of the lead portion housing portion of the igniter receiving portion in the igniter case, since the positioning of the leads of the igniter by the protrusion, and the lead portion of the igniter since at a position close to the connection portion between the external terminals provided in the connector case portion in the igniter case it is possible to position the lead portion of the igniter, the position of connection to an external terminal provided in the lead and the igniter case of the igniter is deviated Therefore, the connection between the lead portion of the igniter and the external terminal by welding, soldering, or the like can be reliably performed, and there is no possibility of causing a connection failure, which can contribute to quality improvement.

Accordingly, the present invention, in the possible be made reliable connection between the lead and the external terminal of the igniter, the welding between the lead portion and the external terminals of the igniter, possible to reliably perform the connection by soldering or the like Therefore, it is possible to provide an ignition coil for an internal combustion engine with improved quality that does not cause poor connection.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments.
FIG. 1 is an explanatory view showing a state where an igniter is housed in an igniter case in an ignition coil for an internal combustion engine according to an embodiment of the present invention, and FIG. 2 is an igniter in the ignition coil for an internal combustion engine according to a reference example . It is explanatory drawing which shows the state in which the igniter was accommodated in the case. 3 and FIG. 4 that are the same as or equivalent to those shown as conventional examples are given the same reference numerals, and description thereof is omitted.

  As shown in FIG. 1, the ignition coil for an internal combustion engine according to the present invention is provided with a protrusion 4X in a lead portion storage portion 422 of an igniter storage portion 42 in an igniter case 4 and the igniter 3 is positioned by the protrusion 4X. is there. In particular, the protrusion 4X is provided on the inner surface 423 of the igniter case 4 facing the lead portion storage portion 422. In other words, the ignition coil for an internal combustion engine according to the present invention has a lead portion 3a of the igniter 3 that is in the vicinity of a connection portion between the lead portion 3a of the igniter 3 and the external terminal 4a of the connector case portion 41 of the igniter case 4. In order to position the igniter 3, the protrusion 4 </ b> X is provided on the inner surface 423 of the igniter housing portion 42 of the igniter housing 4 facing the lead portion housing portion 422.

  Then, in the ignition coil for an internal combustion engine according to the present invention, the igniter 3 is positioned in the vicinity of the connection portion between the lead portion 3a of the igniter 3 and the external terminal 4a included in the connector case portion 41 of the igniter case 4. Therefore, the position of the connection between the lead portion 3a of the igniter 3 and the external terminal 4a included in the connector case portion 41 in the igniter case 4 is not shifted or minimized. Therefore, the connection between the lead portion 3a of the igniter 3 and the external terminal 4a is reliably performed by welding, soldering, or the like, and the possibility of causing a connection failure is eliminated.

Further, as shown in FIG. 2, the ignition coil for the internal combustion engine according to the reference example is provided in the lead portion 3 a of the igniter 3 in the state where the igniter 3 is housed in the lead portion housing portion 422 of the igniter housing portion 42 in the igniter case 4. The protrusions 4X are provided at the sandwiched positions. In other words, the ignition coil for an internal combustion engine according to another embodiment of the present invention is an igniter that is in the immediate vicinity of a connection portion between the lead portion 3a of the igniter 3 and the external terminal 4a included in the connector case portion 41 of the igniter case 4. In order to position the igniter 3 with the three lead portions 3a, the protrusion 4X is provided at a position between the lead portion 3a accommodated in the lead portion accommodating portion 422 of the igniter accommodating portion 42 in the igniter case 4. is there.

Then, in the ignition coil for an internal combustion engine according to the reference example , the igniter 3 is positioned in the vicinity of the connection portion between the lead portion 3a of the igniter 3 and the external terminal 4a included in the connector case portion 41 of the igniter case 4. Therefore, the position of the connection between the lead portion 3a of the igniter 3 and the external terminal 4a included in the connector case portion 41 in the igniter case 4 is not shifted or minimized. Therefore, the connection between the lead portion 3a of the igniter 3 and the external terminal 4a is reliably performed by welding, soldering, or the like, and the possibility of causing a connection failure is eliminated.

Have been described in detail with implementation forms of the present invention, the present invention is, if there is no departing from the matters described in the claims, is not limited to the above embodiments, and various modifications in design Is possible.

That is, the present invention has a configuration in which a protrusion is provided on the inner surface of the lead portion storage portion of the igniter case facing each other and the lead portion of the igniter is positioned by this protrusion, and the igniter lead portion and the external terminal provided in the igniter case as long as it positioning the lead portion of the igniter in close proximity of the connection portion between the position of connection to an external terminal provided in the lead and the igniter case of the igniter eliminating that deviates, or minimize Therefore, the connection between the lead portion of the igniter and the external terminal by welding, soldering, etc. can be reliably performed, and there is no risk of poor connection, which can contribute to quality improvement. An ignition coil for an internal combustion engine belonging to

It is explanatory drawing which shows the state in which the igniter was accommodated in the igniter case in the ignition coil for internal combustion engines which concerns on one Embodiment of this invention. It is explanatory drawing which shows the state by which the igniter was accommodated in the igniter case in the ignition coil for internal combustion engines which concerns on a reference example . It is a schematic plan view which shows the outline of the conventional ignition coil for internal combustion engines. It is explanatory drawing which shows the state by which the igniter was accommodated in the igniter case in the conventional ignition coil for internal combustion engines.

DESCRIPTION OF SYMBOLS 1 Ignition coil for internal combustion engines 2 Insulating case 3 Igniter 3a Lead part 3b Mold part 4 Igniter case 41 Connector case part 42 Igniter accommodating part 421 Mold part accommodating part 422 Lead part accommodating part 423 Inner surface of lead part accommodating part 4a External terminal 4X Projection Part

Claims (1)

An igniter housing part comprising a mold part housing part for housing the mold part of the igniter, and a lead part housing part for housing the lead part of the igniter, and connected to the igniter housing part for connecting the igniter to an external power source possess a connector case portion having an external terminal, a for the said from the connector case portion to the lead portion housing portion of the igniter receiving portion is protruded at one end of the external terminals, the leads of the igniter to the end In the ignition coil for an internal combustion engine provided with an igniter case for connecting the parts,
Protruding portions are provided on the inner surfaces of the igniter case facing the lead portion storage portion , and the protruding portions positioned the lead portions of the igniter connected to the external terminals .
An ignition coil for an internal combustion engine.

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