JP2004221147A - Coil bobbin and ignition coil apparatus for internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coil bobbin and an ignition plug apparatus for an internal combustion engine without causing a rare short circuit among layers of the coil. <P>SOLUTION: A secondary coil bobbin 26 includes a plurality of flanges 26b provided and going around the outer periphery of a cylinder 26a for forming a groove 26d around which a secondary coil 27 is wound, and a cutout 26c provided in the flange 26 and extending from an outer peripheral end of the flange to the cylinder 26a. In the secondary coil bobbin 26, the width w of the cutout 26c is set to range within 0.3 mm to 1.0 mm. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a coil bobbin around which a coil is wound around an outer periphery, and to an ignition coil device for an internal combustion engine that uses the coil bobbin to supply a high voltage for generating spark discharge to a spark plug.
[0002]
[Prior art]
FIG. 4 is a longitudinal sectional view showing a schematic configuration of an example of an ignition coil device for an internal combustion engine.
In FIG. 4, reference numeral 11 denotes an insulating case formed of a synthetic resin having an insulating property. The insulating case 11 is integrally formed with an insulating case body 12 having an open upper surface and a side wall 13 of the insulating case body 12 so as to protrude outward. And a high-pressure tower 16 integrally formed on the bottom 14 of the insulating case main body 12 so as to protrude outward.
A plurality of primary terminals 18 are attached to the socket 15, and a high-voltage terminal 19 is attached to the high-voltage tower 16.
[0003]
Reference numeral 21 denotes a coil-core assembly, in which a primary coil bobbin 23 having a cylindrical shape, a primary coil body 22 composed of a primary coil 24 wound around the outer periphery of the primary coil bobbin 23, and an outer portion of the primary coil body 22 A secondary coil bobbin 26 having a tubular shape concentric with the primary coil bobbin 23 and a secondary coil body 25 composed of a secondary coil 27 wound around the outer periphery of the secondary coil bobbin 26 are disposed. A rod-shaped center core 28 penetrating the coil bobbins 23 and 26 concentrically, an annular side core 29 surrounding the center core 28 in a plane, and a permanent core disposed between the side core 29 and the center core 28. And a magnet 30.
Reference numeral 31 denotes an insulating resin such as an epoxy resin.
[0004]
In the ignition coil device for an internal combustion engine, a high-voltage terminal 19 is press-fitted into the high-pressure tower 16 of the insulating case 11 from, for example, a lower side of the high-pressure tower 16, and both ends of the primary coil 24 and the secondary One end of the coil 27 is connected, and the other end of the secondary coil 27 is connected to the high voltage terminal 19.
Then, the coil-core assembly 21 is placed on the bottom 14 so that the cores 28 and 29 are parallel to the bottom 14 of the insulating case main body 12, and a plurality of primary terminals 18 are pressed into the socket 15. Attach.
When the coil-core assembly 21 is placed on the bottom 14 in this manner, a part of the coil-core assembly 21 (the lower side of the primary and secondary coil bodies 22 and 25) is housed in the high-pressure tower unit 16. .
[0005]
Next, each member of the coil-core assembly 21 is insulated and fixed in the insulation case 11 by injecting and solidifying an insulating resin 31 in the insulating case 11 so as to cover the coil-core assembly 21. can do.
Therefore, by applying a predetermined voltage to the primary terminal 18, it is possible to generate a high voltage at the high voltage terminal 19 for generating a spark discharge in the spark plug.
[0006]
5 is an enlarged sectional view of the conventional secondary coil bobbin shown in FIG. 4, FIG. 6 is an enlarged side view of the conventional secondary coil body shown in FIG. 4, and FIG. 7 is a partially enlarged view of FIG.
FIG. 5 is a sectional view corresponding to line XX in FIG.
In these figures, the secondary coil bobbin 26 has a rectangular cylinder 26a having a horizontally long cross section, and is provided around the outer periphery of the cylinder 26a to form a groove 26d around which the secondary coil 27 is wound. It is composed of a plurality of collars 26b.
Each flange 26b is provided with a notch 26c extending from the outer peripheral end to the cylindrical body 26a so that the winding 27a can pass from one groove 26d to the adjacent other groove 26d.
Note that h indicates the height of the flange 26b, and w indicates the width (maximum width) of the notch 26c.
[0007]
[Problems to be solved by the invention]
In the secondary coil bobbin 26 constituting the conventional ignition coil device for an internal combustion engine, the width w of the notch 26c is set in a range of 1.2 mm to 4.0 mm.
Usually, the cylindrical portion 26a is 11.2 mm to 25.6 mm × 13.0 mm to 25.6 mm, the height h of the flange 26b is 1.7 mm to 6.3 mm, and the thickness of the flange 26b is 0 mm. 0.5 mm to 1.0 mm, and the diameter of the winding 27a is 0.035 mm to 0.065 mm.
[0008]
Therefore, the width w of the notch (crossover portion) 26c is increased, and as shown in FIG. 7, the winding 27a of the notch 26c is disturbed or bulged, thereby causing a rare short between the layers of the secondary coil 27. It was easy.
[0009]
SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned inconveniences, and an object thereof is to provide a coil bobbin and an ignition coil device for an internal combustion engine, in which rare short-circuit does not occur between coil layers.
[0010]
[Means for Solving the Problems]
First, according to the first aspect of the present invention, a plurality of orbiting flanges forming grooves for winding coils are provided on the outer periphery of the cylindrical body, and a cutout portion from the outer peripheral end to the cylindrical body is provided in the flange. In the coil bobbin, the width of the notch is set in a range of 0.3 mm to 1.0 mm.
Next, the invention according to claim 2 is to accommodate a coil-iron assembly in which an iron core passes through a primary coil and a secondary coil in an insulating case, and inject and solidify an insulating resin into the insulating case. In an internal combustion engine ignition coil device in which each member of a coil-core assembly is insulated and fixed in an insulating case, a secondary coil bobbin for winding a secondary coil is wound around a cylinder and an outer periphery of the cylinder. The flange is provided with a plurality of flanges forming a groove around which the secondary coil is wound, and the flange is provided with a notch from the outer peripheral end to the cylindrical body, and the width of the notch is 0.3 mm to 1. It is set in the range of 0 mm.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an enlarged sectional view of a secondary coil bobbin according to an embodiment of the present invention, FIG. 2 is a side view of a secondary coil body in which a secondary coil is wound around the secondary coil bobbin shown in FIG. 1, and FIG. FIG. 8 is a partially enlarged view of FIG. 2, and the same or corresponding parts as in FIGS.
FIG. 1 is a sectional view corresponding to line YY in FIG.
[0012]
In these figures, the secondary coil bobbin 26 has a rectangular cylinder 26a having a horizontally long cross section, and is provided around the outer periphery of the cylinder 26a to form a groove 26d around which the secondary coil 27 is wound. It is composed of a plurality of collars 26b.
Each flange 26b is provided with a notch 26c extending from the outer peripheral end to the cylindrical body 26a so that the winding 27a can pass from one groove 26d to the adjacent other groove 26d.
[0013]
Note that h indicates the height of the flange 26b, and w indicates the width (maximum width) of the notch 26c.
And the cylinder part 26a is set to 11.2 mm-25.6 mm x 13.0 mm-25.6 mm, the height h of the flange 26 b is set to 1.7 mm-6.3 mm, and the thickness of the flange 26 b is 0.5 mm. The diameter of the winding 27a is 0.035 mm to 0.065 mm.
Further, the width w of the notch 26c is set in a range of 0.3 mm to 1.0 mm.
[0014]
As described above, according to the embodiment of the present invention, the width w of the cutout portion (crossover portion) 26c is reduced, so that the winding 27a of the cutout portion 26c is not turbulent or bulged as shown in FIG. By reducing the number, rare short between the layers of the secondary coil 27 does not occur.
[0015]
In the above-described embodiment, the secondary coil bobbin 26 of the ignition coil device for an internal combustion engine has been described as an example. However, it is needless to say that the present invention can be applied to other devices such as a coil bobbin of a transformer.
[0016]
【The invention's effect】
As described above, according to the present invention, the width of the notch (crossover) is set in the range of 0.3 mm to 1.0 mm, so that the width of the notch (crossover) is reduced.
Therefore, since the winding of the winding in the cutout portion is less disturbed and bulged, rare short-circuiting between the coil layers does not occur.
[Brief description of the drawings]
FIG. 1 is an enlarged sectional view of a secondary coil bobbin according to an embodiment of the present invention.
FIG. 2 is a side view of a secondary coil body in which a secondary coil is wound around the secondary coil bobbin shown in FIG.
FIG. 3 is a partially enlarged view of FIG. 2;
FIG. 4 is a longitudinal sectional view showing a schematic configuration of an example of an ignition coil device for an internal combustion engine.
FIG. 5 is an enlarged sectional view of the conventional secondary coil bobbin shown in FIG.
FIG. 6 is an enlarged side view of the conventional secondary coil body shown in FIG.
FIG. 7 is a partially enlarged view of FIG. 6;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Insulation case 12 Insulation case main body part 13 Side wall 14 Bottom 15 Socket part 16 High voltage tower part 18 Primary terminal 19 High voltage terminal 21 Coil-iron assembly 22 Primary coil body 23 Primary coil bobbin 24 Primary coil 25 Secondary coil body 26 Secondary coil bobbin 26a Cylindrical body 26b Flange 26c Notch 26d Groove 27 Secondary coil 27a Winding 28 Center core 29 Side core 30 Permanent magnet 31 Insulating resin h Flange height w Notch width

Claims (2)

Around the outer periphery of the cylindrical body, a plurality of circumferential flanges forming a groove for winding the coil are provided, and in the coil bobbin provided with a cutout from the outer peripheral end to the cylindrical body at the flange.
The width of the notch was set in the range of 0.3 mm to 1.0 mm,
A coil bobbin characterized by the above-mentioned. A coil-core assembly in which an iron core passes through a primary coil and a secondary coil is accommodated in an insulating case, and an insulating resin is injected into the insulating case and solidified, so that the coil-core is inserted into the insulating case. In an ignition coil device for an internal combustion engine in which each member of the assembly is insulated and fixed,
A secondary coil bobbin for winding the secondary coil, a cylindrical body, a plurality of flanges provided around the outer periphery of the cylindrical body, forming a groove for winding the secondary coil,
A notch provided from the outer peripheral end to the cylindrical body was provided on the flange, and the width of the notch was set in a range of 0.3 mm to 1.0 mm.
An ignition coil device for an internal combustion engine.

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