JPH0669052A - Ignition coil device for engine and its assembly jig - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an ignition coil device for an engine and a jig for assembling the engine, which has high reliability, is easy to assemble, and can be downsized. [Structure] A core formed by integrally forming a center core and a side core with a soft magnetic material into a substantially E-shape, a coil unit fitted to the center core and comprising a primary coil and a secondary coil, a side core and a coil unit. In an ignition coil device for an engine, which includes an IC unit having a built-in element for controlling a current flowing through a primary coil, provided between the center coil and the side core, except for the vicinity of the tips of the center core and the side core.
The outer peripheries of the side cores and other components and the regions extending over these spaces are covered and filled, and the core, the coil unit and the IC unit are integrally fixed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ignition coil device for an engine and a jig for assembling the ignition device for an engine, and particularly to a high pressure magnet generator (magneto) type engine ignition device. The present invention relates to an ignition coil device for an engine and a jig for assembling the same.

[0002]

2. Description of the Related Art Conventionally, in a certain type of high-voltage magnet generator, a short-circuit current is generated in the primary coil of the ignition coil by a mechanism similar to that of a normal AC generator, and a short-circuit current is generated in the vicinity of the maximum value of the short-circuit current. The circuit is cut off and a high voltage is generated in the secondary coil by changing the current value in the primary coil. By applying this principle, sparks due to discharge are generated in the spark plug, and the mixed gas of vaporized fuel and air is explosively burned to drive the engine.

FIG. 5 is a partially sectional front view showing an example of an ignition coil device constituting a conventional ignition device, and FIG. 6 is shown in FIG.
FIG. 4 is a main part A arrow view in FIG. In FIGS. 5 and 6, reference numeral 1 is a core, and the center core 2 and the side core 3 are integrally formed into a substantially E-shape. Such a core is usually formed by laminating a plurality of plate materials made of a soft magnetic material such as a soft iron plate.

Reference numeral 4 is a coil unit, and a primary coil 5
Bobbins 7 and 8 made of an insulating material for the secondary coil 6 and the secondary coil 6, respectively.
It is formed by being wound around the outer periphery of and is fitted to the center core 2. A support plate 9 supports the primary coil 5 and the secondary coil 6, and is fixed to the core 1 via the ground terminal 10. Reference numeral 11 is a primary lead wire, and 12 is a secondary lead wire, which are connected to one end of each of the primary coil 5 and the secondary coil 6. The other end of each of the primary coil 5 and the secondary coil 6 is connected to the ground terminal 10. Reference numeral 13 denotes an IC unit, which has a built-in diode and other elements and has a function of controlling a current flowing through the primary coil 5 by connecting to the primary lead wire 11.

In the case of assembling the ignition coil device having the above-mentioned structure, the primary coil 5 and the secondary coil 6 are coaxially fitted, and the outer periphery of the primary coil 5 and the secondary coil 6 is covered with a coating 14 made of an insulating resin. Then, the center core 2 is fitted together with the support plate 9. Next, at least one of the plate materials that constitutes the center core 2 is cut into a substantially 9
The coil unit 4 is bent at 0 ° and brought into contact with the lower end of the bobbin 7 of the primary coil 5 to prevent the coil unit 4 from slipping out of the center core 2. And connect the ground terminal 10 to the core 1,
The required wiring connection work is performed.

[0006]

In the ignition coil device having the above-mentioned conventional structure, the coil unit 4 is loosely fitted to the center core 2 and only the lower end thereof is supported by the bent portion 2a. Therefore, it easily vibrates or resonates due to vibration of the engine or the like. Therefore, there is a problem that undesired noise is generated and loosening is easily caused at the electrical and / or mechanical connection points.

Since the IC unit 13 for controlling the current flowing through the primary coil 5 is separately attached,
There is also a problem that the assembling work is complicated and an extra space for mounting the IC unit 13 is required, which makes it difficult to downsize the entire device.

Further, the coil unit 4 is provided with a coating 14 on its outer periphery for maintaining insulation, but cracks are generated in the coating 14 due to environmental changes and the like, and the primary coil 5 and the secondary coil 6 are There is also the problem of short-circuiting, which lowers the reliability of the device. FIG. 7 is a vertical cross-sectional view of a main part showing a conventional coil unit 4, and the same parts are designated by the same reference numerals as those in FIGS. 5 and 6. When the crack 15 is generated in the coating 14 as shown in FIG. 7, the insulation between the primary coil 5 and the secondary coil 6 is impaired, and the predetermined high voltage is not generated in the secondary coil 6.

The present invention solves the above-mentioned problems existing in the prior art, has high reliability, is easy to assemble, and can be downsized, and an ignition coil device for an engine and a jig for assembling the same. The purpose is to provide.

[0010]

In order to achieve the above object, in the first aspect of the present invention, a center core and a side core made of a soft magnetic material are integrally formed in a substantially E shape, and a center core. Ignition coil device for engine, which includes a coil unit that is fitted to the coil and that includes a primary coil and a secondary coil, and an IC unit that is provided between the side core and the coil unit and that includes an element that controls a current flowing through the primary coil. In the above, except for the vicinity of the tips of the center core and the side cores, the outer periphery of the side cores and other components and the region extending over these spaces are covered and filled with an insulating molding resin, and the core, the coil unit and the IC are covered. We adopted the technical means of fixing the units together.

Next, in the second aspect of the present invention, a core formed of a soft magnetic material in which a center core and a side core are integrally formed into a substantially E-shape, and a center coil fitted into the core are provided. In a jig for assembling an engine ignition coil device, which comprises a coil unit consisting of a coil and an IC unit which is provided between the side core and the coil unit and which contains an element for controlling a current flowing through a primary coil, a hollow cylinder with a bottom is formed. A mask member, which is made of an elastic and flexible material and is formed so as to be in close contact with the outer periphery of the tip end portions of the center core and the side core, is detachably provided on the bottom of the formed body, and the mask member is pressed to the outside of the bottom of the body. We adopted a technical means of fixing the pressing member to make it possible to liquid-seal the insulative molding resin filled in the main body.

[0012]

With the above structure, the IC unit can be housed in the inner space of the core, the assembling work can be facilitated, and the size of the device can be reduced. Moreover, since the constituent members can be integrally fixed by the molding resin, durability against vibration and other external forces can be increased.

[0013]

1 is a partial sectional front view showing an embodiment of the present invention, FIG. 2 is a sectional plan view of the same portion, FIG. 3 is a right side view thereof, and the same portions are the same reference numerals as those in FIG. Indicate. In these figures, 9a is a support, which is formed integrally with the support plate 9 and is fixed to the upper end of the core 1 by locking it.

The IC unit 13 is interposed between the side core 3 and the coil unit 4, connects the lead wire 13a with the primary lead wire 11 and the ground terminal 10, and supports the support wire 13b integrally implanted. It is suspended and supported by the support plate 9 by being locked in the support hole 9b provided in the plate 9. The primary coil 5 and the secondary coil 6 are the same as the conventional ones in that they are suspended and supported by the support plate 9 via lead wires, respectively. With the above structure, a molding resin 1 having an insulating property by using a mold as described later together
6, the constituent members can be integrally fixed.

FIG. 4 is a partial sectional front view showing an example of an assembling jig for integrating the constituent members by molding in the embodiment of the present invention, and the same portions are designated by the same reference numerals as those in FIGS. 1 to 3. Indicate. In FIG. 4, reference numeral 20 denotes a mold, for example, a main body 21 and a pressing member 22 formed in a bottomed hollow cylindrical shape with a plastic material or the like, and a mask member 2 formed with rubber or another elastic flexible material.
3 and 24.

The internal size of the main body 21 is formed to be slightly larger than the external size of the assembly composed of the constituent members shown in FIGS. Next, the mask member 23 is provided at its upper end with a recessed portion 23a having an inner dimension corresponding to the outer dimension of the center core 2. Further, the mask member 24 is provided with a hole 24a having an inner dimension corresponding to the outer dimension of the cross section of the side core 3. The recess 23a and the hole 24a
It is preferable that the inner dimensions of the above are formed to be slightly smaller than the outer dimensions of the corresponding center core 2 and side core 3. After the mask members 23 and 24 having the above-described configuration are fitted in the stepped holes provided in the bottom portion of the main body 21, the pressing member 22 is fixed to the main body 21 via, for example, a set screw (not shown). , 24 are positioned and fixed.

With the above configuration, the assembly in which the coil unit 4 and the IC unit 13 are mounted on the core 1 is inserted into the mold 20. Then, the protrusion 3a and the stepped portion 3b provided on the side core 3 are pushed in until they come into contact with the bottom of the main body 21, whereby the positioning is completed. That is, the lower end of the center core 2 fits into the recess 23 a of the mask member 23, and the lower end of the side core 3 fits into the hole 24 a of the mask member 24.

In this state, the main body 21 is filled with a liquid molding resin having an insulating property up to a level shown by a chain line, for example, and after solidification, the core 1 is pulled out upward, as shown in FIGS. 1 to 3. As described above, the constituent members can be integrally fixed by the molding resin 16. The lower ends of the center core 2 and the side cores 3 are masked by the mask members 23, 2
Since it is masked by 4, it is possible to prevent undesired deposition of the molding resin 16.

FIG. 8 is a longitudinal sectional view of an essential part showing a modified example of the coil unit 4 in the embodiment of the present invention, and the same parts are designated by the same reference numerals as those in FIG. In FIG. 8, 7a
Is a closed portion, which is formed integrally with the bobbin 7 and is shown in FIG.
Also, it is provided on the side corresponding to the lower end of the center core 2 in FIG. With such a configuration, the primary coil 5 and the secondary coil 6 are completely cut off by the bobbin 7, so that even if cracks 15 occur in the coating 14 as shown in FIG. Can be held. Therefore, it is not necessary to make the coating 14 thick, and the insulation between the primary coil 5 and the secondary coil 6 can be improved even if it is formed by an impregnating means such as varnish.

[0020]

Since the present invention has the structure and operation as described above, the core and the coil unit are integrally formed, so that the resistance to vibration is large. Further, unlike the conventional configuration in which the coil unit molded in the core is fitted, the core and the coil unit are integrated, so that retention or spot welding of the ground or soldering is not necessary. Furthermore, since resin and other surplus materials do not adhere to the mounting holes provided near the tip of the side core,
The accuracy of attachment to the engine can be improved. Further, since the constituent members can be integrally fixed by the molding resin, the assembling work can be facilitated, the durability against vibration and other external forces can be increased, and the life and reliability of the device can be greatly improved. is there.

[Brief description of drawings]

FIG. 1 is a partially sectional front view showing an embodiment of the present invention.

FIG. 2 is a partial cross-sectional plan view showing an embodiment of the present invention.

FIG. 3 is a right side view showing an embodiment of the present invention.

FIG. 4 is a partial cross-sectional front view showing an example of an assembling jig that integrates the constituent members by molding in the embodiment of the present invention.

FIG. 5 is a partially sectional front view showing an example of an ignition coil device that constitutes a conventional ignition device.

6 is a main part A arrow view in FIG.

FIG. 7 is a vertical cross-sectional view of a main part showing a conventional coil unit 4.

FIG. 8 is a longitudinal sectional view of an essential part showing a modified example of the coil unit 4 in the embodiment of the invention.

[Explanation of symbols]

 1 core 4 coil unit 13 IC unit 16 molding resin

Claims (2)

[Claims] 1. A core formed by integrally forming a center core and a side core of a soft magnetic material into a substantially E shape, a coil unit fitted to the center core, the coil unit including a primary coil and a secondary coil, and a side core. An ignition coil device for an engine comprising an IC unit which is provided between the coil unit and an element for controlling a current flowing through a primary coil, and an insulating molding resin except for the vicinity of the tip portions of the center core and the side cores. According to the above, the ignition coil device for an engine is characterized in that the outer periphery of the side core and other components and the region extending over these spaces are covered and filled, and the core, the coil unit and the IC unit are integrally fixed. 2. A core formed by integrally forming a center core and a side core of a soft magnetic material into a substantially E shape, a coil unit fitted to the center core, the coil unit including a primary coil and a secondary coil, and a side core. A jig for assembling an engine ignition coil device, which comprises an IC unit which is provided between the coil unit and an element for controlling a current flowing through a primary coil, and is attached to a bottom of a main body formed in a hollow cylinder with a bottom. , A mask member made of an elastic and flexible material and formed so as to be in close contact with the outer peripheries of the center core and the side cores, and a pressing member for pressing the mask member is fixed to the outside of the bottom of the main body, A jig for assembling an ignition coil device for an engine, characterized in that an insulating molding resin filled in the main body can be liquid-sealed. .