JPH0447945Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an ignition coil, and particularly to an advantageous mounting structure of a direct coupler to a coil case.

[Prior Art] A conventional direct coupler for an ignition coil is fixed to the tip of the bobbin or core cover of the primary coil placed in the coil case prior to casting, and then fixed to the core cover of the primary coil placed inside the coil case. The surrounding area and interior were cast with epoxy resin or the like to cover and fill the area.

[Problems to be Solved by the Invention] However, in the conventional ignition coil direct coupler mounting structure as described above, the direct coupler tends to tilt during manufacturing. Therefore, in order to accurately position and fix the direct coupler, it is necessary to take precautions to prevent the direct coupler from tilting during manufacturing.
Some kind of jig was required. For this reason, the installation work of the direct coupler was troublesome. Furthermore, in the conventional mounting structure, the direction in which the coupler is taken out is the casting surface, which complicates casting workability.

The purpose of the present invention was to provide a direct coupler for ignition coils that allows for easy and reliable installation of the direct coupler and improves casting workability. Provides mounting structure.

[Means for Solving the Problems] The ignition coil according to the present invention includes a pair of guide rails extending along the longitudinal direction on the outer surface of the coil case, and a positioning protrusion provided between the guide rails. and slide guide pieces provided at both ends in the width direction of the main body of the direct coupler along the guide rail, and connect the engagement hole provided at one end of the main body to the positioning protrusion. An ignition coil characterized in that a direct coupler is fixed to an outer surface of a coil case by engaging with the ignition coil.

[Operation of the invention] In the direct coupler of the invention, when the guide piece is fitted into the guide rail provided on the outer surface of the coil case and the engagement hole is further engaged with the positioning protrusion, the direct coupler can be connected in a so-called one-touch manner. can be easily fixed onto the side of the coil case. In addition, since the direct coupler attached to the coil case is immovably supported by the rigidity of the coil case, the inclination of the direct coupler is reduced when resin is cast inside the coil case, allowing accurate positioning. be done.

[Example] Hereinafter, details of the present invention will be explained using examples shown in the drawings.

FIGS. 1 and 2 are diagrams showing one embodiment of an ignition coil employing a direct coupler mounting structure according to the present invention. As shown in FIG. 1, the coil case 10 is formed to have a substantially U-shaped cross section, and a guide portion 11 is provided on the outer surface 10a of the coil case 10. The guide portion 11 is composed of a pair of guide rails 11a, 11b extending along the longitudinal direction of the outer surface 10a at upper and lower positions of the outer surface 10a of the coil case 10. are bent inward so that their tips face each other. Further, the coil case 10
On the outer surface 10a of the guide rails 11a, 11
A protrusion 12 for positioning the direct coupler in the advancing and retracting direction, which will be described later, is provided so as to be located between the protrusions 12 and 12b. Furthermore, both sides 10c of the lower opening 10b of the coil case 10 are bent inward so as to face each other, and guide grooves 10d are provided on the inner side of the side edges 10c. There is.

An iron core 13 is arranged inside the coil case 10, and both longitudinal ends 13 of this iron core 13 are arranged inside the coil case 10.
a, 13b are configured to protrude outward from both ends in the longitudinal direction of the coil case 10, and mounting holes 13c, 13d are provided in both ends 13a, 13b to penetrate in the vertical direction. A locking member made of an elastic body as shown in detail in FIG. 3 is attached to both ends 13a and 13b of the iron core 13 so as to sandwich these ends 13a and 13b from above and below. Mounting holes 14c and 14d are provided in the upper and lower pieces 14a and 14b, respectively. Top piece 14
a can be elastically deformed and moved in the direction of arrow A in FIG. 1, and the mounting hole 14c provided in the upper piece 14a has a long hole shape with a longer diameter in the direction of movement of the upper piece 14a. These mounting holes 14c, 14d
In the state before installation, the hole position is shifted in the direction of arrow A, and by pressing and moving the upper piece 14a in the direction of arrow A against the urging force due to the elasticity of the lock member 14 itself, the hole position is shifted in the direction of arrow A. This allows the positions of both holes to match.

The mounting holes 14c, 14d of the iron core 13 and the mounting holes 14c, 14d of the lock member 14 are adapted to be inserted into a mounting boss 16 fixed to a cylinder head 15 (see FIG. 2) of the engine. An engaging portion 16a consisting of an annular groove is provided near the upper end of this mounting boss 16.
A rubber suspension 17 is mounted below a. In this way suspension 17
Since it uses the cylinder head 15, it is not easily affected by vibrations applied from the cylinder head 15.

When the mounting holes 13c, 13d of the iron core 13 are inserted into the mounting boss 16 and mounted, the peripheral edge of the mounting hole 14c provided in the upper piece 14a of the locking member 14 is shaped as shown in FIG. To,
It is in a state of engagement with the engaging portion 16a of the mounting boss 16, and prevents the iron core 13 and the lock member 14 from coming off from the mounting boss 16. Note that a nut 18 attached to the lower part of the attachment boss 16 is embedded in the cylinder head 15.

A primary coil 19 is fitted into the longitudinally intermediate portion of the iron core 13, and a secondary coil 20 is further fitted so as to be positioned around the outer periphery of the primary coil 19. Bobbin 2 of this secondary coil 20
As shown in FIG. 1, mounting pins 22 are provided at the bottom of the flange portions 21a formed at both ends of the flange 1. As shown in FIG. The mounting pin 22 is fitted into and supported in a hole 24c of a support piece 24a projecting from the longitudinal end of the flat plate portion 24 of the secondary coil fixing guide 23. Note that the hole 24c of the support piece 24a provided at the left end of the flat plate portion 24 is circular, and the hole 24c of the support piece 24a provided at the right end of the flat plate portion 24 is circular.
The hole 24d of the hole 4b has a circular shape with a partially cut-out upper end opening. Further, the flat plate portion 24 is provided with a fitting hole 24e having a rectangular shape in plan view, with one end touching the support piece 24b. 25
A is designed to be fitted and mounted. Further, the widthwise dimension of the flat plate portion 24 is formed to be approximately equal to the widthwise dimension of the lower opening 10b of the coil case 10, and lower openings provided in the coil case 10 are formed at both widthwise ends thereof. Guide pieces 24f and 24g are provided so as to fit into the guide piece 10b. These guide pieces 24f, 24g
The flat plate portion 24 is attached to the coil case 10 through the coil case 10, so that the lower opening 10b is completely closed.

The high-pressure plate 25 is integrally provided with a rising portion 25b at the right end position of the substrate portion 25a and a bent portion 25c at the upper end position of the rising portion 25b. The tip of this bent portion 25c is fitted into the hole 24d of the support piece 24b. As a result, the high voltage plate 25 is attached to the flat plate part 24 in a state where the secondary coil fixing guide 23 is prevented from coming off the flat plate part 24. Further, the high voltage side winding end 20a of the secondary coil 20 is connected to the bent portion 25c protruding from the hole 24d.

Further, a connection hole 24h is bored at the left end of the bottom wall of the fitting hole 24e, and the cylindrical portion 26 is integrated with the lower surface of the flat plate portion 24 so as to be located below the guide piece 24g. It is set in. The hole in this cylindrical portion 26 communicates with the connection hole 24h, and a female thread is provided on the inner wall thereof, although it is not clear from the drawing.

A male screw 27a located above the high voltage terminal 27 is inserted into the cylindrical portion 26 from below and is screwed into the cylindrical portion 26. Furthermore, a protrusion 27b located at the upper end of the male screw 27a is connected to the substrate portion 25a of the high voltage plate 25. The structure is such that it is inserted and coupled into a small hole 25d provided in the.

Connecting portion 27c provided at the bottom of the high voltage terminal 27
A joint member 28 is fitted into the joint member 28, and after aligning the mounting hole 14d of the connecting portion 27c with the mounting hole 28a provided at the upper part of the joint member 28, insert the rivet 2 into these mounting holes 27d and 28a.
By inserting and caulking 9, the connecting portion 27c and the joint member 28 are connected as shown in FIGS. 2 and 4. Joint member 2
As shown in detail in an exaggerated manner in FIG. 5, the shape of 8 is formed into an ellipse in which the diameter connecting the mounting holes 28a is the minor axis above the longitudinal middle part, and the longitudinal middle part The lower part has an elliptical shape with a longer axis corresponding to the shorter axis. Further, a mounting hole 28b is provided in a short diameter portion perpendicular to the long diameter portion of this lower portion. Therefore, the mounting hole 28a and the mounting hole 28b are provided at positions perpendicular to each other. The upper part 30a of the connector register 30 is fitted into the lower part of the joint member 28. The connector resistor 30 has a mounting hole 30 provided in the upper part 30a.
b is the lower mounting hole 2 of the joint member 28.
8b, the rivets 31 are inserted into these mounting holes 30b and 28b and caulked to connect to the joint member 28. There is a plug 3 at the bottom of the connector register 30.
The upper ends of the two are connected. The connector resistor 30 and the like are inserted into an insulating cap boot 32a. In addition, this cap boots 3
2a corresponds to a conventional plug cap.

The direct coupler 33 is fixed to the outer surface 10a of the coil case 10. That is, the width direction dimension of the main body part 33a of the direct coupler 33 is formed such that the distance between the guide rails 11a and 11b is equal, and the width direction dimension of the main body part 33a is formed such that the distance between the guide rails 11a and 11b is equal. A guide piece 33 that fits into and engages with the
b and 33c are integrally provided. The positioning protrusion 1 is attached to the protrusion 33d provided on the right end of the main body 33a of the direct coupler 33 in the longitudinal direction.
An engagement hole 33e is formed in which the connector 2 can be engaged, and a socket 34 on the power supply side is provided on the upper surface of the right end in the longitudinal direction. Further, a pair of terminal pieces 33f and 33g are provided on the lower surface of the left end in the longitudinal direction of the main body part 33a. For example, one terminal piece 33f connects to one terminal 19a of the primary coil 19, and the other terminal piece 33g
are connected to the other terminal 19b of the primary coil 19 and the low voltage side winding end 20b of the secondary coil 20, respectively.

The inside of the coil case 10 is filled with an insulating coil mold 35 made of epoxy resin or the like. Also, the area around the coil case 10 is the iron core 13.
, the cylindrical portion 26 of the secondary coil fixing guide 23, and the socket 34 of the direct coupler 33 are covered with another coil mold.

Next, the installation work of the direct coupler 33 will be explained. First, after fitting the primary coil 19 to the iron core 13 placed inside the coil case 10,
The secondary coil 20 is moved to the coil case 10 side together with the secondary coil fixing guide 23. After positioning and fitting the guide pieces 24f and 24g provided on the flat plate portion 24 of the secondary coil fixing guide 23 into the guide groove 10d of the coil case 10,
It is pushed along the guide groove 10d of the coil case 10 so as to close the lower opening 10b of the coil case 10. When this pushing is completed, the secondary coil fixing guide 23 constitutes one wall and bottom part of the coil case 10. At the same time as the installation of the secondary coil fixing guide 23 is completed, the work of fitting the secondary coil 20 around the primary coil 19 is also completed. After that, the direct coupler 33 is fixed to the outer surface 10a of the coil case 10. That is, the guide pieces 33b and 33c of the direct coupler 33 are connected to the guide rail 11 provided on the outer surface 10a.
a, 11b, and further along the guide rails 11a, 11b, the direct coupler 33
When the positioning protrusion 12 provided on the outer surface 10a is engaged with the engagement hole 33e, the outer surface 1 of the coil case 10 of the direct coupler 33 is moved.
Installation to 0a is completed. After this, the terminal piece 33
Connect f, 33g and the winding end of each coil,
The inside of the coil case 10 is filled with resin through a casting operation. Furthermore, both ends 13a of the iron core 13,
13b, cylindrical part 2 of the secondary coil fixing guide 23
6 and the coil case 10 except for the socket 34 of the direct coupler 33 are covered with a coil mold 35.
Then, the manufacturing of the ignition coil is completed.

[Effect of the invention] As explained above, according to the invention, the guide pieces provided at both ends in the width direction of the main body of the direct coupler are slidably guided by the guide rails provided on the outer surface of the coil case. The direct coupler is fixed to the outer surface of the coil case by engaging an engagement hole provided at one end of the main body with a positioning protrusion provided on the outer surface of the coil case. . In this way, the rigidity of the coil case is used to attach the direct coupler with one touch, so the inclination of the direct coupler during manufacturing can be reduced, and the direct coupler can be fixed easily and reliably. can. Furthermore, since the casting surface can be made wider, the casting workability can be improved.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of the ignition coil according to the present invention, Fig. 2 is a schematic side view showing the installed state of the ignition coil, Fig. 3 is a partially enlarged sectional view of the lock member,
FIG. 4 is an enlarged perspective view of the main parts, and FIG. 5 is an enlarged perspective view of the joint member. Explanation of symbols, 10...Coil case, 10a...
...Outer surface, 11... Guide portion, 11a, 11b...
... Guide rail, 12 ... Positioning protrusion, 33
... Direct coupler, 33a ... Main body, 33
b, 33c...Guide piece, 33e...Engagement hole.

Claims (1)

[Scope of utility model registration request] A pair of guide rails extending along the longitudinal direction on the outer surface of the coil case and a positioning protrusion provided between the guide rails are provided, and a pair of guide rails are provided at both ends in the width direction of the main body of the direct coupler. The direct coupler is attached to the outer surface of the coil case by slidingly guiding the guide piece along the guide rail and engaging the engagement hole provided at one end of the main body with the positioning protrusion. An ignition coil characterized by being fixed.