JPS62116830A - Method of assembling resin mold ignition coil - Google Patents

Abstract

PURPOSE:To connect a primary bobbin and an iron core by the hardening of a thermo- setting resin and simplify the work processes and improve productivity by blocking the lower end of the cylindrical space between the internal circumference of a primary bobbin and the outer face of an iron core and filling also the cylindrical space with a resin when pouring a thermo-setting resin into a case. CONSTITUTION:A packing 9 and a washer 10 have in its center a hole through which the leg section of an iron core passes, their on core 6 being inserted into the inner circumference of a primary bobbin from below. Into the inner circumference of a primary bobbin 3' the leg section of the other iron core is inserted from above, and a thermo-setting resin 5 is poured into a case 2 until the resin level reaches the open upper face of the case. The upper end of a primary bobbin 3' is lower by h than the open upper face of the case, so that at the final stage of the filling, the resin flows into a cylindrical space 8 which is blocked with a package 9 at the lower end and fills the space 8 which includes the distance between the opposite iron cores 6 and 6'. With this arrangement the hardening of the resin can connect the coil assembly and the iron core. Accordingly the work processes are simplified and productivity is improved.

Description

Detailed Description of the Invention (Industrial Application Field) This invention is a coil assembly with a bottom, which consists of a primary coil wound on a primary bobbin and a secondary coil fitted concentrically to the outside of the primary coil. The coil assembly is fixed in the case by a thermosetting resin poured into the case, and the coil assembly is fixed to the inner periphery of the primary bobbin of the coil assembly through the bottom of the case. This invention relates to a method of assembling a resin-molded ignition coil for internal combustion engines, etc., which has a penetrating iron core.

(Prior Art) Such a resin molded ignition coil is known from Japanese Utility Model Application Publication No. 111 of 1983 filed by the applicant of the present patent, and its outline is as shown in Fig. 5, in which an iron core is passed through the bottom. The case 2 has an opening/Y for forming the plastic, and the primary bobbin 3'
One end of the primary bobbin 3I of the coil assembly A where the secondary coil lI is fitted concentrically outside the primary coil J wound above! The coil assembly is fitted into the opening at the bottom of the case 1 to close the opening, and the coil assembly is placed on the bottom inside the case, and the terminals connected to the windings of each coil are arranged in the required state.
In this section, the high-voltage terminal connected to the winding end of the secondary coil is attached to the bottom of the case in a penetrating manner (the rest is omitted), the molten thermosetting resin is cast and filled into the case, and the coil is assembled by solidifying it. In addition to fixing the three-dimensional body in the case, the core 6 is laminated to improve the dielectric strength, and then passed through the bottom of the case to the inner periphery of the primary bobbin of the coil assembly, and is easily caulked and laminated so as not to fall apart. Insert it from the top and bottom, and in that state, in order to assemble the core in a straight manner, weld the opposing faces of both cores together, or sandwich both cores together with two backing plates, and caulk them together with the backing plates. Alternatively, use a U-shaped leaf spring clamp to clamp both cores together and tighten.

(Problem to be Solved by the Invention) In this case, a cylindrical space between the inner periphery of the primary bobbin 3' and the iron core 6.6 is used to connect the assembly A of both the primary and secondary coils to the iron core. It is necessary to put adhesive resin Y inside and adhere it.

However, this gluing is an additional work after assembly, and
The thickness of the cylindrical space is very narrow, around o-sm, and it is difficult to apply adhesive resin between the spaces, which causes a decrease in productivity.

Furthermore, the amount of resin applied tends to vary, which causes the bonding strength between the core and the coil assembly to vary and not be as uniform as desired.

(Means for solving the problem) Therefore, the present invention closes the lower end of the cylindrical space between the inner periphery of the primary bobbin and the outer surface of the iron core, and when casting thermosetting resin into the case, the resin is removed. It is characterized in that it also fills the cylindrical space.

(Function) The thermosetting resin filled in the cylindrical space connects the primary bobbin and the iron core by solidifying.

(Example) In each of the embodiments shown in FIGS. 1 to 3, the same elements as in the conventional example described above are given the same reference numerals.

In both embodiments, when the primary bobbin is placed on the bottom of the case, the top end of the primary bobbin is slightly lower than the open top surface of the case. The main difference between each embodiment is that the cylindrical space l
This is a method of closing the lower end of the

First, in the embodiment shown in FIG. 1, one end of the primary bobbin 3' is fitted into the opening l in the bottom of the case, and the coil assembly is erected on the bottom of the case in the same manner as in the conventional example. Of course, the opening / is the primary bobbin 3'
The shape corresponds to the outer shape of one end of the . And on the bottom of the case is a padskin 9'? ! - Place a washer IO on the bottom surface of this packing. The packing 9 and washer 10 are provided at the center of a hole through which the legs of the iron core B are inserted from below into the inner periphery of the primary bobbin. Therefore, washer 1
By passing the legs of the above iron core from below through the holes in the packing machine, the washer ioy is inserted into the sideways bent part of the iron core.
2. Can be supported from below.

Then, the legs of the other iron core are inserted into the inner periphery of the primary bobbin 3' from above, and then the thermosetting resin j'11 is poured into the case up to the open upper surface thereof. As mentioned above, the upper end of the primary bobbin 3' is five days lower in height than the open upper surface of the case, so at the end of filling, the resin flows into the cylindrical space closed by the lower end and the iron core 6. ,
The above space gy (fills) including the opposing distance between the legs of B.

This allows the coil assembly and the iron core to be joined together by assimilating the resin j.

As shown in the figure, if the washer IO is provided with an enclosing wall IO'7 that shallowly fits around the outer periphery of the packing and holds the packing, the washer and the packing can be assembled and placed without being separated, and the inner periphery of the hole in the center of the packing can be assembled and placed. are pressed into contact around the legs of the iron core that pass therethrough, effectively preventing resin from leaking between them.

In addition, in order to prevent resin leakage from the underside of the packing 9 and the bottom of the case, an endless protrusion that bites into the packing from above is provided on the bottom of the case, surrounding the opening, as shown in the figure. It is also effective to put

Furthermore, the washer 70 under the packing is supported from below at a location opposite to the sideways portion of the iron core, and in order to prevent the packing and washer from tilting (missing), the iron core is provided with a protrusion l as shown in the figure.
-l is provided (preferably. This protrusion is located at the iron core 6
It may be provided for each sheet when punching with a press, or it may be formed by punching out without protrusions, simply caulking, laminating, and then processing by extrusion or the like.

In the embodiment shown in FIG. 2, an endless protrusion isy, 2 is provided on the inner periphery of one end of the primary bobbin J' that fits into the opening l at the bottom of the case, and this protrusion 13 The lower end of the cylindrical space t is closed.

Further, in the embodiment shown in FIG. 6, as in the embodiment shown in FIG. 1, a packing 9 and a washer 10 are placed on the lower surface of the bottom of the case core, and the iron core is supported from below by a horizontal portion and a protrusion. In addition, in this embodiment, the inner shape of the opening at the bottom of the case is made to correspond to the cross-sectional shape of the leg of the iron core 6, and one end of the primary bobbin 3' of the coil assembly is fitted into the opening. The lower end of the cylindrical space is closed by the peripheral edge l' of the opening l, and the resin is prevented from leaking from between by the gasket 9.

Even in the embodiments shown in Figures 2 and 3 above, thermosetting resin is inside the case l up to the top surface! ! Cylindrical space g by casting filling
The core is filled with resin, and when it solidifies, the coil assembly and core can be connected.

The embodiment shown in FIG. 4 is intended to show that the level at the upper end of the primary bobbin 3' is not lower than the open surface of the case controller, and even if it is the same as the open surface, it is included in the technical idea of the present invention. in,
This embodiment is the same as the embodiment shown in FIG. 1 except for this point and the fact that the iron core 6 is L-shaped.

In this case, the case is made of thermoplastic resin! When filling the case, attach a frame to the upper part of the outer surface of the case and add an amount of thermosetting resin inside the case that can also fill the cylindrical space surrounded by the above frame from the open surface of the case. Cast into. As a result, the amount of the cast resin to fill the cylindrical space gyl overflows upward from the open surface of the case, and is kept inside the frame surrounded by the frame /4. The upper surface of the resin is lowered to the same level as the open surface of the case and the upper surface of the cylindrical space. Then, after assimilation of the resin, the frame/
Simply remove the rod, combine the L-shaped core held through the primary bobbin with another L-shaped core outside the case as shown by the broken line, and assemble them together by sandwiching them between plates or the like.

The two iron cores to be combined are both C-shaped as in the embodiment shown in Figs. 1 to 3, and may be inserted into the inner periphery of the primary bobbin from above and below the legs w of both iron cores, but as shown in Fig. 4. Both are L-shaped,
On the other hand'? : It may pass through the inner circumference of the primary bobbin, or
Furthermore, use the working shape and one C-shaped core, penetrate the working shape into the inner periphery of the primary bobbin, combine this with the other C-shaped core outside the case, and caulk using the plate. You can also combine it with

Furthermore, the entire assembly thus assembled according to the present invention may be covered and packaged with a synthetic resin layer as shown in the above-mentioned publication.

(Effects of the Invention) According to the present invention, the coil assembly is fixed in the A'4 case,
In addition, it is cast inside the case to improve its dielectric strength.
The thermosetting resin 5 filled can simultaneously connect the coil assembly A, the iron core 6, and the coil assembly B. Therefore, the process is simplified and productivity is improved.

Then, since the lower end l of the cylindrical space g between the inner periphery of the primary bobbin 3' and the iron core 6 and the iron core 6 is closed, a resin with low viscosity can be used, and the resin with low viscosity can be used. The resin-metal fitting between the parts can be done well, and the primary bobbin and eventually the coil assembly A
The bonding strength between the iron core and the iron core also becomes constant as required.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a coil assembled according to the first embodiment of the present invention, Fig. 2 is a sectional view of a coil also assembled according to the second embodiment, and Fig. 3 is a sectional view of a coil assembled according to the third embodiment. figure,
Figure 4 is a cross-sectional view of a coil assembled according to another embodiment, and Figure 5 is a cross-sectional view of a coil assembled according to a conventional example. In the figure, / is an opening, C is a case, and J is a primary coil. , 3' is the bobbin, q is the secondary coil, A is the assembly of both coils, j
is a thermosetting resin, 6 is an iron core, t is a cylindrical space, D is a gasket that closes the lower end of the space, /' is the same (periphery of the opening /), 13 is the same (protrusion on the inner periphery of the primary bobbin) 1. Patent applicant: Hanshin Electric Co., Ltd. Figure 4 Figure 5

Claims (1)

[Claims] A coil assembly consisting of a primary coil wound on a primary bobbin and a secondary coil fitted concentrically to the outside of the primary coil is erected on the bottom of a case with a bottom. The coil assembly is fixed in the case using a thermosetting resin poured into the case.
In the method of assembling a resin molded ignition coil in which the iron core is passed through the bottom of the case and into the inner periphery of the primary bobbin of the coil assembly, the lower end of the cylindrical space created between the inner periphery of the primary bobbin and the outer surface of the iron core. A method for assembling a resin molded ignition coil, characterized in that when the thermosetting resin is poured into the case, the cylindrical space is also filled with resin.