JP2008014176A - Igniter for internal combustion engine and its assembling method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an igniter for an internal combustion engine capable of surely welding a lead terminal and an external terminal, and capable of improving an insulation property between the lead terminals. <P>SOLUTION: The igniter for the internal combustion engine comprises a primary coil and a secondary coil, a laminated iron core magnetically connecting the two coils, a power switch for controlling on-off of an electric current supplied to the primary coil and generating a high voltage current on the secondary coil side, and an insulating case for housing them. A lead terminal end part of the power switch is deformed and processed so as to have a wide inter-terminal distance, and thereby, the lead terminal and the external terminal can be surely welded, and the insulation property between the lead terminals can be improved, and productivity can be improved. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an internal combustion engine ignition device for generating spark discharge in an ignition plug of an engine such as an automobile.

  In a conventional internal combustion engine ignition device, for example, as shown in FIG. 4, a power switch 1 having a general-purpose package size is soldered to make an electrical connection with an external terminal. And the dimensions of the terminal spacing are determined. Further, as a means for connecting the lead terminals of the power switch 1, the lead terminal provided with the convex protrusion and the external connection terminal are sandwiched between the electrodes, and a current is flowed from the electrodes to the protrusions while applying pressure. Projection welding is performed to weld.

  However, when the soldering or projection welding is performed to electrically connect the conventional power switch 1 having such a configuration to the outside, the distance between the terminals becomes as short as about 2.5 mm, which causes a problem in insulation. Has occurred. Further, when connected to an external terminal having a width wider than that of the lead terminal, the distance between the terminals is further reduced, causing a problem in insulation. Further, since the distance between the terminals is narrow and the shape is difficult to be sandwiched between electrodes, there is a problem that the welding operation is stabilized and a plurality of terminals cannot be welded at the same time, and productivity cannot be improved.

  The present invention has been proposed in view of the above, and an object of the present invention is to provide an internal combustion engine ignition device that can improve the insulation and increase the productivity by widening the interval between the lead terminals of the power switch. Is.

  In order to achieve the above object, an ignition device for an internal combustion engine according to the present invention includes a primary coil and a secondary coil, a laminated iron core that magnetically couples the two coils, and an on-off current flowing through the primary coil. An ignition device for an internal combustion engine comprising a power switch that controls and generates a high-voltage current on the secondary coil side, and an insulating case that houses them, wherein the distance between the terminals of the lead terminals of the power switch is widely deformed It is characterized by processing.

  In the present invention, the lead terminal of the power switch is curved three-dimensionally.

  In the present invention, the lead terminal of the power switch can be electrically connected to the outside by welding.

  In the present invention, each lead terminal of the power switch has a step portion.

  In the present invention, the distance between the terminals of the lead terminal tip is at least 3 mm.

  The present invention also provides a primary coil and a secondary coil, a laminated iron core that magnetically couples the two coils, and ON / OFF control of the current flowing through the primary coil to generate a high-voltage current on the secondary coil side. In an assembling method of an ignition device for an internal combustion engine comprising a power switch and an insulating case for housing them, the distance between the terminals of the lead terminal tip of the power switch is widely modified and assembled.

  Since this invention consists of an above-described structure, there can exist an effect which is demonstrated below.

  In the present invention, a primary coil and a secondary coil, a laminated iron core that magnetically couples the two coils, and a power for generating a high-voltage current on the secondary coil side by ON-OFF control of the current flowing through the primary coil. In the internal combustion engine ignition device comprising a switch and an insulating case for housing these, the distance between the terminals of the lead terminals of the power switch has been widely deformed, so that insulation between the lead terminals is ensured and welded. The process can be stabilized. Further, productivity can be improved.

  In the present invention, since the lead terminal of the power switch is curved three-dimensionally, the lead terminal and the external terminal can be reliably welded. Further, the insulation between the lead terminals can be improved.

  In the present invention, since the lead terminal of the power switch is electrically connected to the outside by welding, the lead terminal and the external terminal can be reliably connected.

  In the present invention, since the lead terminals of the power switch each have a stepped portion, a welding operation for connecting the lead terminal and the external terminal can be easily performed.

  In the present invention, since the distance between the terminals of the lead terminal tip is at least 3 mm or more, the lead terminal and the external terminal can be reliably welded by projection welding or the like, and the insulation between the lead terminals is improved. Can do. Moreover, there is no possibility of causing insulation failure.

  In the present invention, the primary coil and the secondary coil, the laminated core that magnetically couples the two coils, and the current flowing through the primary coil are ON / OFF controlled to generate a high-voltage current on the secondary coil side. In the assembling method of the ignition device for an internal combustion engine comprising the power switch and the insulating case for storing these, the lead terminal of the power switch is assembled after the distance between the terminals of the lead terminal of the power switch is widely deformed and assembled. And the external terminal can be more reliably connected, and the insulation between the lead terminals can be improved to improve the productivity.

  In the internal combustion engine ignition device, it is possible to achieve the purpose of ensuring the insulation between the lead terminals and stabilizing the welding process by widely deforming the distance between the terminals of the lead terminals of the power switch. Further, productivity can be improved.

  Hereinafter, the present invention will be described in detail with reference to the drawings illustrating an embodiment. 1 is a longitudinal sectional view showing an outline of an ignition device for an internal combustion engine according to the present invention, FIG. 2 is a front view showing a power switch used in the ignition device for an internal combustion engine of the present invention, and FIG. 3 is a power switch of the present invention. It is a side view which shows after the process. Here, the internal combustion engine ignition device 10 performs ON-OFF control of the primary coil 11 and the secondary coil 12, the laminated iron core 13 that magnetically couples the two coils, and the current flowing through the primary coil 11, An ignition device for an internal combustion engine comprising a power switch 14 for generating a high-voltage current on the secondary coil side and an insulating case 15 for housing them, and the inter-terminal distance H of the lead terminal 16 of the power switch 14 is widely modified. It has been processed.

  For example, as shown in FIGS. 2 and 3, the lead terminals 16 are configured to be curved three-dimensionally so that the distance H between the terminals is at least 3 mm. In the present embodiment, as shown in FIG. 2, among the three lead terminals 16, the central lead terminal 16a is formed by being bent in a direction perpendicular to the paper surface. Further, the left and right lead terminals 16b and 16c are bent in a direction perpendicular to the paper surface and bent in directions away from the center lead terminal 16a. Further, as shown in FIG. 3, a portion A surrounded by a circle of the lead terminal 16 is formed in the stepped portion. That is, the lead terminal 16 is once bent at a right angle with respect to the longitudinal direction of the power switch 14 and then bent again in parallel with the longitudinal direction to form a stepped portion. Further, in the vicinity of the tip of the lead terminal 16, a small protrusion 17 formed in a convex shape is formed. The power switch 14 can use a general-purpose power transistor, for example, a power having a package such as TO-220 type, TO-251 type, TO-126 type, MP-10 type, TO-3P type, etc. It can be applied to a transistor.

  When configured as described above, the lead terminals 16a to 16c are three-dimensionally curved, and the inter-terminal distance H at the tip of the lead terminal can be formed wide. Therefore, when the small protrusion 17 is melted by sandwiching the lead terminal and the external connection terminal between the electrodes and projection welding is performed, the terminal width is wide, so that the welding operation can be easily performed.

Next, a method for assembling the internal combustion engine ignition device will be described.
In this embodiment, the primary coil 11 and the secondary coil 12, the laminated core 13 that magnetically couples the two coils, and the current flowing through the primary coil are ON / OFF controlled, and the secondary coil side has a high voltage. A method of assembling an ignition device for an internal combustion engine comprising a power switch 14 for generating a current and an insulating case 15 for housing them, wherein the distance H between the terminals of the lead terminals of the power switch 14 is widely deformed. Later, the terminals are welded together by flowing the current concentrated on the small protrusions 17 while pressing the lead terminal 16 and the external connection terminal between the electrodes. At this time, the distance between the tips of the lead terminals is wide, so that the work of sandwiching the lead terminal and the external connection terminal between the electrodes is easy. Therefore, workability can be increased and productivity can be improved. Further, the distance between the terminals can be increased, and sufficient insulation can be ensured.

  The present invention is not limited to the above-described embodiments, and various design changes can be made based on the description of the scope of claims.

FIG. 1 is a longitudinal sectional view showing an outline of an internal combustion engine ignition device according to the present invention. FIG. 2 is a front view showing a power switch used in the internal combustion engine ignition device. FIG. 3 is a side view showing the power switch after processing. FIG. 4 is a front view showing an example of a conventional power switch.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Ignition device 11 for internal combustion engine Primary coil 12 Secondary coil 13 Laminated iron core 14 Power switch 15 Insulating case 16 Lead terminal 17 Small protrusion

Claims (6)

A primary coil and a secondary coil, a laminated iron core that magnetically couples the two coils, a power switch that performs on-off control of the current flowing through the primary coil and generates a high-voltage current on the secondary coil side, and these In an ignition device for an internal combustion engine comprising an insulating case for storing
An internal combustion engine ignition device characterized in that a distance between terminals of a lead terminal tip portion of the power switch is widely deformed.   The ignition device for an internal combustion engine according to claim 1, wherein the lead terminal of the power switch is curved three-dimensionally.   The ignition device for an internal combustion engine according to claim 1 or 2, wherein the lead terminal of the power switch is electrically connected to the outside by welding.   The ignition device for an internal combustion engine according to any one of claims 1 to 3, wherein each of the lead terminals of the power switch has a stepped portion.   5. The internal combustion engine ignition device according to claim 1, wherein the distance between the terminals of the lead terminal tip is at least 3 mm or more. A primary coil and a secondary coil, a laminated iron core that magnetically couples the two coils, a power switch that performs on-off control of the current flowing through the primary coil and generates a high-voltage current on the secondary coil side, and these In an assembling method of an ignition device for an internal combustion engine comprising an insulating case for storing
A method of assembling an ignition device for an internal combustion engine, comprising assembling after the distance between terminals of the lead terminal of the power switch is widely deformed.

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