JPH05195932A - Ignition distributor for internal combustion engine - Google Patents

Abstract

PURPOSE:To make an ignition distributor compact by the efficient disposition structure of an ignition coil and a distributing part. CONSTITUTION:The outer peripheral wall part 3a of a distributor cap 3 is fixed to the side wall part 2a of a housing for holding a shaft 1 rotatably. A coil storage part 3f for storing an ignition coil 5 is formed at the distributor cap 3, and a bowl-shape distributor rotor 15 extended into a ring-shape space 3e after making a detour around the coil storage part 3f from the tip part of the shaft 1 is fixed to the shaft 1. An axially-extended rotor electrode 16 is then fixed to the outer peripheral end of the distributor rotor 15, and a side electrode 10 is disposed in opposition to the rotor electrode 16. An angle-of- rotation sensor 25 is further disposed at the outer peripheral part of the tip part of the shaft 1 in the housing 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ignition distributor for an internal combustion engine in which an ignition coil is integrally mounted on a distribution cap.

[0002]

2. Description of the Related Art In the conventional device of this type, an ignition coil is integrally mounted by projecting above the power distribution cap (for example, Japanese Patent Laid-Open No. 63-75356).

[0003]

However, in the above-mentioned conventional one, since the ignition coil is integrally mounted by projecting above the power distribution cap, the power distribution unit and the ignition coil are miniaturized. The layout is not considered at all.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a favorable arrangement structure for downsizing the power distribution section and the ignition coil.

[0005]

Therefore, according to the present invention, a shaft rotatably driven by an internal combustion engine, a housing for rotatably holding the shaft, and a cylindrical outer peripheral wall portion mounted on the housing are provided. The shaft has a radial wall portion that extends in an inner diameter direction from an end portion of the outer peripheral wall portion opposite to the housing, and a bottom wall portion that protrudes from the inner diameter side of the radial wall portion toward the tip end portion of the shaft. A distribution cap made of an electrically insulating material having a coil storage space on the side opposite to the coil storage space and a coil storage space having a ring-shaped space formed between the coil storage space and the outer peripheral wall, and the ignition stored in the coil storage space. The coil, a plurality of side electrodes protruding into the ring-shaped space and arranged at a predetermined interval in the vicinity of the radial wall portion of the distribution cap, and mounted on the tip of the shaft. A distribution rotor made of an insulating material that extends from the tip of the shaft to bypass the coil storage portion and extends toward the ring-shaped space, and a high voltage is supplied from the ignition coil, and the rotation of the shaft causes the rotation of the shaft. An ignition distributor for an internal combustion engine is provided, which includes a side electrode and a rotor electrode mounted on the distribution rotor so as to face the side electrode.

[0006]

As a result, the power distribution section can be constructed by utilizing the ring-shaped space around the outer circumference of the coil housing section projecting from the power distribution cap toward the tip of the shaft.

Further, the space on the outer peripheral side of the shaft tip portion can be effectively used as a space for disposing the rotation angle sensor.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3, reference numeral 1 denotes a shaft which is rotationally driven by a cam shaft (not shown) of an internal combustion engine. The shaft 1 is rotatably held by a housing 2 having a relatively low cylindrical side wall 2a. There is. Reference numeral 3 denotes a power distribution cap made of an electrically insulating synthetic resin material. It has a radial wall portion 3b extending further in the inner diameter direction and a bottom wall portion 3c protruding from the inner diameter side of the radial wall portion 3b toward the tip of the shaft 1, and a coil storage space 3d on the opposite side of the shaft 1. It has a coil housing portion 3f which is formed and also has a ring-shaped space 3e formed between it and the outer peripheral wall portion 3a.

Reference numeral 5 denotes an ignition coil housed in the coil housing space 3d, which has parallel magnetic path portions 6a and 6b extending in a direction parallel to the bottom wall 3c of the coil housing portion 3f. Of the two L-shaped cores 6A and 6B, and the bottom wall 3c of the parallel magnetic path portions 6a and 6b.
Of the secondary coil 7 wound around the magnetic path portion 6a on the side and the magnetic path portion 6b on the side opposite to the bottom wall of the parallel magnetic path portions 6a and 6b.
The secondary coil 8 and the insulating resin material 9 partially filling the peripheral portion of the secondary coil 7 in the coil housing space 3d are included. In this way, the primary coil 8 and the secondary coil 7 are separated, and the insulating resin material 9 is partially filled in the peripheral portion of the secondary coil 7 located below the primary coil 8. As a result, it is possible to reduce the weight of the ignition coil 5 by reducing the filling rate of the insulating resin material 9 with respect to the ignition coil 5 and to lower the center of gravity of the ignition coil 5 while having a structure that ensures the withstand voltage of the secondary coil 7. Therefore, it is suitable as an ignition coil integrated structure for the power distribution cap 3.

Then, the side electrodes 10 corresponding to the number of cylinders are arranged at predetermined intervals in the vicinity of the radial wall portion 3b of the power distribution cap so as to project into the ring-shaped space 3e. The detailed configuration is such that axial tower portions 3g are formed at predetermined intervals on the radial side wall 3b of the power distribution cap 3 by a predetermined number of cylinders, and a ring-shaped stopper member 11 is provided on the outer periphery of the tip of each tower portion 3g.
Is fixed, and a ring-shaped step portion 11a is provided on the outer periphery of each tower portion 3g by the lower end portion of the stopper member 11. Further, each high voltage cord 12 is coupled to the upper end of each side electrode 10 in a right angle direction, and each side electrode 10 is left with the tip side of each side electrode 10 left.
And the high voltage cords 12 are joined to each other by molding with a resin. Reference numeral 14 denotes a holding member made of synthetic resin for coupling and holding each mold portion 13 to each tower portion 3g, and each ring-shaped step portion 11 of each tower portion 3g.
a pair of claw portions 14a hooked on a, and each mold portion 1
A resin spring portion 14b for pressing the tower 3 against each tower portion 3g by elastic force is integrally formed.

An insulating material (synthetic resin) 15 is attached to the tip of the shaft 1 and extends from the tip of the shaft to the ring-shaped space 3e, bypassing the coil housing 3f.
The power distribution rotor 15 is formed of a bowl shape. Reference numeral 15A denotes a partial bowl-shaped curved shape along the outer surface of the bowl-shaped rotor 15 from the tip of the shaft 1,
A rotor holding plate made of a metal plate that is fixed to the tip of the shaft 1 by welding and that holds the bowl-shaped rotor 15 on its outer diameter side by screws 15B.
Between the rotor 15 and the rotor holding plate 15A,
The projection 15b and the hole (not shown) into which the projection 15b is fitted are positioned.

A high voltage 16 is supplied from the ignition coil 7 and each side electrode 1 is rotated as the shaft 1 rotates.
0 is a rotor electrode made of a ceramic resistor mounted on the distribution rotor 15 so as to face the distribution rotor 15. The rotor electrode 16 extends axially from a part of the outer diameter end of the distribution rotor 15.
The rotor electrode is adhered and fixed to the inner peripheral surface of a in the axial direction, and the rotor electrode is pressed against the tongue piece 16 by one end of a metal leaf spring 17, and has a circular arc-shaped diameter facing each side electrode 10. Has an outer side surface in the direction, and the upper end of the outer side surface in the radial direction projects upward from the tongue piece 15a.

Reference numeral 18 denotes an igniter arranged on the open end side in the coil housing space 3d for connecting and disconnecting the primary current of the ignition coil 5, and 19 electrically connects the igniter 18 and the ignition coil 5 in the coil housing space 3d. A terminal made of a metal plate to be electrically connected, 20 is attached to the opening end of the coil housing portion 3f so as to cover the coil housing space 3d and is closely attached to the side surface of the igniter 18, 21 is an external member of the igniter 18. It is a connector for supplying signals and power, and is adhesively fixed to a notch 3h formed at the open end of the coil housing 3f. Reference numeral 27C is a noise-preventing capacitor arranged near the igniter 18.

Further, the radial wall portion 3b of the power distribution cap 3 is formed with a hole 3i for connecting the coil housing space 3d and the ring-shaped space 3e. 22 is an ignition coil 5
Is supplied with a high voltage, and the bottom wall portion 3c of the coil housing portion 3f is
And a pair of spring insertion grooves 22a formed in parallel to the tangential direction by connecting the inside and the outside to the opening end side.
A central electrode 23 having a cylindrical brush housing portion 22b (see FIG. 5) in which the above is formed is housed in the brush housing portion 22b, and the tip end side becomes a tapered truncated cone portion 23.
Reference numeral 24 is a carbon brush formed with a (see FIG. 5), and 24 is a clip-shaped spring that is inserted into the spring insertion groove 22a and presses the tapered portion 23a of the brush 23. The other end of the leaf spring 17 is elastically contacted with the tip of the brush 23, and the leaf spring 17 is fixed to the power distribution rotor 15 by the heat caulking of the protrusion 15c provided on the power distribution rotor 15, Is supplied to the rotor electrode 16 via the leaf spring 17.

Reference numeral 25 denotes a rotation angle sensor which is separated from the ignition coil 5 via a bowl-shaped power distribution rotor 15 and is disposed in the housing 2 at a position substantially parallel to the tip end portion of the shaft 1 in the axial direction. The signal rotor is fixed to the tip of the shaft 1 so as to face the rotation angle sensor 25. The signal rotor 26 is fixed to the back surface of the rotor holding plate 15A by welding to fix the magnet holding plate 26a made of a metal plate fixed to the tip of the shaft 1 via the rotor holding plate 15A, and the magnet holding plate 26a. It is composed of a permanent magnet 26c held on the outer periphery of the curved portion 26b formed in a part of the above, and a non-magnetic metal plate 26d which covers the outer periphery of the magnet 26c and is fixed to the curved portion 16b. Further, the rotation angle sensor 25 is composed of an electromagnetic pickup or a hall sensor that generates an output voltage by changing the interlinkage magnetic flux from the permanent magnet 26c, and a connector 27 for taking out the output thereof is integrally formed of resin. The connector 27 is fitted in the notch 2b formed at the opening end of the side wall 2a of the housing 2.

Further, an air vent hole 2c is formed on the outer peripheral side of the bottom wall portion of the housing 2, and the bottom wall portion of the housing 2 on the inner peripheral side of the air hole 2c projects axially inward of the housing 2. An arc-shaped partition 2d is integrally formed. Reference numeral 28 denotes a ring-shaped synthetic resin pressure-resistant cover arranged between the power distribution rotor 15 and the rotation angle sensor 25, and a ring-shaped rubber seal member 29 having a U-shaped cross section along the entire outer peripheral edge thereof.
The outer peripheral edge of the pressure resistant cover 28 is sandwiched and held between the side wall 2 a of the housing 2 and the outer peripheral wall portion 3 a of the power distribution cap 3 via the seal member 29.

The coil storage portion 3f projects into the power distribution cap 3, bypasses the coil storage portion, and extends from the tip of the shaft 1 into a ring-shaped space 3e on the outer circumference of the coil storage portion 3f. 15 is extended and a ring-shaped space on the outer circumference of the coil housing portion 3f can be utilized to configure a power distribution section. Further, the space on the outer circumference side of the tip end portion of the shaft 1 is provided with a rotation angle sensor 25 and a pressure resistant cover 28. It can be effectively used as an arrangement space, and an efficient arrangement structure with a high occupied volume of components can be obtained, and the overall size of the ignition distributor can be reduced.

As described above, in the type in which the ignition coil 5 and the igniter 18 are assembled from the upper surface (outer side) of the power distribution cap 3, the primary coil 8 and the igniter 18 of the ignition coil 5 are exposed to the outside air and adversely affected by water and dust. In order to prevent (decrease in electrical insulation, corrosion, etc.), a heat radiating plate 20 covering the ignition coil housing space 3d is provided.

However, if this is completely sealed, there is a concern that the above-mentioned adverse effect on the internal parts may be caused by the generation of dew condensation due to the difference between the inside and outside temperatures. Therefore, it becomes necessary to provide an atmosphere opening hole for communicating the ignition coil housing space 3d of the cap 3 with the outside air. You have to take out the rubber cap you have), which leads to an increase in the total length of the assembly and an increase in the number of parts.

Therefore, in this structure, the holes 3 are formed in the dead space on the back surface of the cap 3 during the molding process of the cap 3.
By providing i and adopting a structure that avoids the above-mentioned adverse effects, it is possible to further reduce the total length and the number of parts.

The cylinder number and the direction of rotation must normally be specified on the cap 3, but this is usually different for each internal combustion engine. Therefore, the cylinder number and the like can be formed by the mold of the cap 3. If we try to represent it, we need to make a mold for each internal combustion engine. However, in this structure, on the upper surface of the heat radiating plate 20, the name plate 2 that clearly indicates the cylinder number and the rotating direction together with the product number as shown in FIG.
By sticking 0a (the product number is different for each internal combustion engine), it is possible to obtain the effect that one mold of the cap 3 can be used in common.

The ground terminal (ground terminal) from the igniter 18 is a plate-like terminal 19a as shown in FIG.
Through the bolt to the bolt insertion hole 3j outside the power distribution cap 3, and the plate-like terminal 19a is fastened together with the cap 3 together with the housing 2 by the bolt 4, so that the terminal 19a is bolted to the housing 4 (both The engine is grounded via a conductive metal material).

Next, a portion for transmitting the high voltage generated by the ignition coil 5 to the power distribution rotor 15, a carbon brush 23 is used here conventionally. As a structure for shortening the overall length of the ignition distributor, there is a method of crimping the carbon brush 23 and fixing it to the electrode 22, but since the carbon brush 23 cannot be attached and detached, there is a problem in market serviceability.

Therefore, in this structure, as shown in FIG. 5, a truncated cone-shaped carbon brush 23 is fixed to the aluminum center electrode 22 by inserting a clip-shaped spring 24 from the arrow direction (direction perpendicular to the shaft 1). However, it is removable in the market.

At this time, if the taper portion 23a of the carbon brush 23 is sandwiched by the springs 24, a force for pressing the carbon brush 23 against the center electrode 22 (a force in the axial direction of the shaft 1) is generated. It is possible to prevent 23 rattling.

Further, as shown in FIG. 6, instead of the conical tapered portion 23a, the carbon brush 23 can be prevented from rotating by forming a tapered notch 23b on both sides of the carbon brush 23. Moreover, since the spun ring 24 holds the brush 23 in line contact, it is possible to reduce the stress applied to the carbon brush 23.

Next, a method for reducing ignition noise in this structure will be described. Conventionally, as one means for reducing ignition noise, a rotor electrode 16 made of a thin plate-shaped ceramic resistor has been used at the discharge tip of the distribution rotor 15. However, in the product of this structure, if the rotor electrode 16 made of a thin plate-shaped ceramic resistor is arranged vertically to the shaft 1, there is a problem that the size of the product becomes large.
Therefore, in this structure, the rotor electrode 16 is erected in the axial direction of the shaft 1, and the side of the rotor electrode 16 is arranged as shown in FIG. 7 so that the distance between the rotor electrode 16 and the side electrode 10 does not change due to the difference in ignition timing. It is characterized in that the radially outer surface 16a facing the electrode 10 has an arc shape.

When such a rotor electrode 16 is used, electrical connection and distribution of the rotor electrode 1 from the distribution rotor 3
Metal leaf spring 17 and side electrode 10 also serving to prevent falling of 6
When the distance between the rotor electrode 16 and the rotor electrode 16 is short, discharge may occur directly from the metal leaf springs 17 to the side electrodes 10 and the ignition noise may not be reduced. It is possible to secure a sufficient distance between the leaf spring 17 and the side electrode 10 at the lower portion of the inner diameter side surface so that the upper portion of 16a faces the side electrode 10.

Next, regarding the connecting portion between the ignition distributor and the high-voltage cord 12, it is assumed that size reduction, ease of attachment / detachment, degree of freedom in the withdrawal direction of the high-voltage cord 12, sealing property, cost, etc. are simultaneously satisfied. , And has the following structure.

The side electrode 10 is attached at a right angle to the end of the high-voltage cord 12, and both ends are molded with resin while leaving the tip. This mold part 13 is provided with a claw part 14a.
It is attached to the tower portion 3g of the power distribution cap 3 by another resin holding member 14 provided with. Tower part 3 of power distribution cap 3
A ring-shaped stopper member 11 is fixed to the distal end of the g, and the pair of claw portions 14a of the holding member 14 are hooked on the ring-shaped stepped portion 11a at the lower end of the stopper member 11, whereby the power distribution cap 3 of the high-voltage cord 12 is closed. Is completed.

With this structure, the size can be reduced as compared with the structure in which the metal fitting on the high-voltage cord 12 side and the side electrode on the power distribution cap side are connected in series. Further, by removing the pair of claw portions 14a from the stopper member 11, the high voltage cord 12
Can be easily removed from the power distribution cap 3.

In addition, since the stopper member 11 is ring-shaped, the holding member 1 is provided for each withdrawal direction of the high-voltage cord 12.
It is possible to pull out the high-voltage cord 12 in any direction with one type of holding member 14 without having to make the cord 4.

Further, a pair of resin spring portions 14b are formed on the ceiling portion of the holding member 14, and the high pressure cord 12 is held by this spring force. This holding method is more advantageous in terms of cost than the conventional holding method using a reaction force of an expensive silicon rubber grommet.

Further, the reliability is improved by using two or more O-rings 30 between the inner peripheral surface of the tower portion 3g and the mold portion 13 on the outer peripheral portion of the side electrode 10. The ring-shaped stopper 11 also has a function of preventing the O-ring 30 from falling off.

In the above-described embodiment, the shape of the power distribution rotor 15 is bowl-shaped, but it has a tongue piece 15a portion, a holding portion of the leaf spring 17 and a fixing portion to the rotor holding plate 15A. Coil housing 3 from the tip of 1
Any shape may be used as long as it is a shape that bypasses f and curves and extends in the ring-shaped space 3e.

In each of the above embodiments, the igniter 18,
Although the heat sink 20, the connector 21, and the anti-noise capacitor 27C are separate bodies and are connected and assembled by terminal welding, these may be integrated and integrated to simplify the assembly process.

In this case, as in the embodiment shown in FIGS. 8 to 10, the igniter 18A, the heat sink 20A, the connector 21A,
An igniter case 32 made of resin in which the anti-noise capacitor 27A is integrated is provided. Igniter 18A, connector 2
1A, anti-noise capacitor 27A is connected to terminal 3
0,31, but these terminals 30,31
Is previously insert-molded in the igniter case 32.

A protrusion 33 is provided on the lower surface of the igniter case 32.
Are integrated in several places. This is a pillar that supports the igniter case 32 when the igniter case 32 is attached to the end of the opening of the cap 3A. Further, the radial wall portion 3b of the cap 3A is also provided with a flat portion 37 on which the protrusion 33 rides.

Assembling order is such that after the ignition coil 5A is attached to the opening of the cap 3A, the insulating resin material 9A is filled in the ignition coil housing 3d up to the peripheral portion of the primary coil 8. Next, the igniter case 32 is attached to the opening of the cap 3A. At this time, the protrusion 33 is the flat portion 37 of the cap 3A.
At this time, the igniter case 32 is positioned with respect to the cap 3A. At this time, the insulating resin material 9 previously filled
The liquid level of A is set to such a level that a part of the protrusion 33 is immersed.

Next, when the insulating resin material 9A is cured,
The protrusion 33 is fixed to the cap 3A by the insulating resin material 9A, and thus the igniter case 32 is fixed to the cap 3A.

The connection between the igniter case 32 and the ignition coil 5A is carried out from the igniter case 32 and the ignition coil 5A side to the outside of the cap 3A, respectively.
8 and 39 are welded and connected after the insulating resin material 9A is cured.
Further, a cover 40 is attached to the cap 3A to prevent a short circuit due to water on the terminals 38 and 39.

As described above, the assembly process can be simplified by integrating and integrating the constituent parts. further,
In each of the above-mentioned embodiments, the ignition coil 5 is reduced in size by 1
The structure is such that the secondary coil 7 and the secondary coil 7 are separated from each other, and the anti-noise capacitor 27 is arranged above the core 6B.
As in the embodiment shown in FIGS. 11 to 12, the ignition coil 5B has a concentric winding structure in which the secondary coil 7 is arranged on the outer periphery of the primary coil 8, and the secondary spool 7a for winding the coil 7 is provided.
The structure for disposing the anti-noise capacitor 27B on the top may be adopted.

This embodiment has a concentric winding structure for the purpose of improving the conversion efficiency of the magnetic flux generated in the primary coil 8 in order to improve the performance of the ignition coil 5B. The ignition coil 5B is a closed magnetic circuit core formed by combining the C-shaped core 6C and the I-shaped core 6D, the primary coil 8 is wound around the core 6D portion, and the secondary coil 7 is arranged on the outer periphery thereof. To do.

Next, when the anti-noise capacitor 27B is arranged above the core 6C as in the above-described embodiment, the height dimension of the cap 3B increases, so that the ribs 43b and 43c at the both ends of the slot of the secondary spool 7a and the center. A part of the rib 43d is extended to provide a space for disposing the anti-noise capacitor 27B.

By disposing the anti-noise capacitor 27B in this space in a direction perpendicular to the core 6C, the height dimension of the ignition coil 5B portion can be suppressed. At this time, in order to avoid dielectric breakdown during use, a structure is provided in which a constant distance is maintained between the surface of the secondary coil 7 winding and the anti-noise capacitor 27B.

As described above, even when the ignition coil 5B has a concentric winding structure, the height of the cap 3B can be suppressed.

[0047]

As described above, according to the present invention, the power distribution unit can be configured by utilizing the ring-shaped space around the outer circumference of the coil housing that projects from the power distribution cap toward the tip of the shaft. There is an excellent effect that the ignition distributor can be downsized by a good arrangement configuration for downsizing the parts and the ignition coil.

Further, the space on the outer peripheral side of the shaft tip portion can be effectively used as a space for disposing the rotation angle sensor to further improve the space factor of the parts.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a power distributor of the present invention.

FIG. 2 is a vertical cross-sectional view of the upper half of the distributor shown in an exploded view.

FIG. 3 is a vertical cross-sectional view of the lower half of the distributor shown in an exploded view.

FIG. 4 is a plan view showing a power distribution cap of the power distributor.

5A is a diagram showing a structure of a brush fixing portion to the center electrode in the distributor, and FIG. 5B is a longitudinal sectional view thereof.

FIG. 6A is a view showing the structure of another embodiment of the brush fixing portion to the center electrode in the distributor, and FIG. 6B is a vertical sectional view thereof.

7 is a perspective view showing rotor electrodes in the distributor of FIG. 1. FIG.

FIG. 8 is a vertical cross-sectional view showing another embodiment of the power distribution cap portion of the power distributor.

9 is a bottom view of an igniter case assembled to the power distribution cap of FIG. 8. FIG.

10 is a plan view of the power distribution cap of FIG. 8 before assembling the igniter case.

FIG. 11 is a vertical cross-sectional view showing still another embodiment of the power distribution cap portion of the power distributor.

12 is a vertical cross-sectional view of the power distribution cap of FIG. 11 from different directions.

[Explanation of symbols]

 1 shaft 2 housing 3, 3A, 3B power distribution cap 3a outer peripheral wall portion 3b radial wall portion 3c bottom wall portion 3d coil storage portion space 3e ring-shaped space 3f coil storage portion 3g tower portion 3i hole 5, 5A, 5B ignition coil 6a Parallel magnetic path part 6b Parallel magnetic path part 7 Secondary coil 7a Secondary spool 8 Primary coil 9,9A Insulating resin material 10 Side electrode 11a Ring-shaped step part 12 High voltage cord 13 Mold part 14 Holding member 14a Claw part 15 Distribution Rotor 15A Rotor holding member 16 Rotor electrode 18,18A Igniter 19 Terminal 20,20A Heat dissipation plate 21,21A Connector 22 Center electrode 23 Carbon brush 24 Clip-shaped spring 25 Rotation angle sensor 26 Signal rotor 26a Magnet holding plate 26c Permanent magnet 27C, 27A, 27 B noise prevention capacitor 32 igniter case 43b, 43c, 43d rib

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideo Inaba 1-1-chome, Showa-cho, Kariya city, Aichi Nihon Denso Co., Ltd.

Claims (13)

[Claims] 1. A shaft rotatably driven by an internal combustion engine, a housing for rotatably holding the shaft, a cylindrical outer peripheral wall portion mounted on the housing, and an outer peripheral wall portion of the outer peripheral wall portion opposite to the housing. Has a radial wall portion that extends in the inner diameter direction from the end portion and a bottom wall portion that projects from the inner diameter side of the radial wall portion toward the tip of the shaft, and forms a coil storage space on the opposite side of the shaft. A distribution cap made of an electrically insulating material that has a coil housing portion that forms a ring-shaped space with the outer peripheral wall portion, an ignition coil housed in the coil housing space, and a ring-shaped space A plurality of side electrodes that are protruded and arranged at a predetermined interval near the radial wall portion of the power distribution cap, and are attached to the shaft tip portion, and the coil storage is performed from the shaft tip portion. A distribution rotor made of an insulating material, which bypasses and extends toward the ring-shaped space; and a high voltage is supplied from the ignition coil, and the rotor is opposed to the side electrode as the shaft rotates. An ignition distributor for an internal combustion engine, comprising: a rotor electrode mounted on a distribution rotor. 2. An igniter, which is disposed on the opening end side in the coil housing space and connects and disconnects the primary current of the ignition coil, and the igniter and the ignition coil are electrically connected in the coil housing space. 2. The ignition distributor for an internal combustion engine according to claim 1, further comprising: a terminal that is provided with a heat radiating plate that is attached to an opening end of the coil housing portion so as to cover the coil housing space and is in close contact with the igniter. 3. The ignition coil includes a core having two parallel magnetic path portions extending in a direction parallel to a bottom wall of the coil housing portion, and a magnetic path on the bottom wall side of each of the parallel magnetic path portions. Part wound around the secondary coil, a primary coil wound around the magnetic path on the side opposite to the bottom wall of the parallel magnetic path, and a part around the secondary coil in the coil housing space. An ignition distributor for an internal combustion engine according to claim 1 or 2, further comprising an insulating resin material that is filled therein. 4. An ignition distributor for an internal combustion engine according to claim 3, wherein a hole for communicating the coil housing space and the ring-shaped space is formed in a radial wall portion of the power distribution cap. 5. The ignition distributor for an internal combustion engine according to claim 2, further comprising a name plate attached to an outer surface of the heat dissipation plate, the name plate indicating a cylinder number of the side electrode and a rotation direction of the shaft. 6. A pair of spring insertion grooves formed by being supplied with a high voltage of the ignition coil, fixed to a bottom wall portion of the coil housing portion, and communicating inward and outward with an opening end side and being parallel to a tangential direction. A center electrode having a cylindrical brush accommodating portion formed with, a carbon brush accommodating in the brush accommodating portion and having a taper portion whose tip side becomes thin, and a taper of the brush inserted into the spring insertion groove. An ignition distributor for an internal combustion engine according to any one of claims 1 to 5, further comprising a clip-shaped spring that presses a portion. 7. The power distribution rotor is formed in a bowl shape, and further has a curved shape extending from an end portion of the shaft along an outer surface of the bowl-shaped rotor, and is fixed to the tip end portion of the shaft and at the same time. A rotor holding plate for fixedly holding the rotor in the shape of an outer diameter on its outer diameter side.
6. An ignition distributor for an internal combustion engine according to any one of 6. 8. A rotation angle sensor which is separated from the ignition coil via the bowl-shaped power distribution rotor and is disposed in the housing at a position substantially parallel to the tip end portion of the shaft in the axial direction, The ignition distributor for an internal combustion engine according to claim 7, further comprising: a signal rotor that is arranged to face the rotation angle sensor and is fixed to a tip portion of the shaft. 9. The signal rotor comprises a magnet holding plate fixed to the tip of the shaft and a permanent magnet held on the outer periphery of the holding plate, and the rotation angle sensor changes the interlinkage magnetic flux from the permanent magnet. 9. The ignition distributor for an internal combustion engine according to claim 8, which is composed of an electromagnetic pickup that generates an output voltage by means of. 10. The rotor electrode extends in the axial direction from the outer diameter side of the distribution rotor and has a radially outer surface formed in an arc shape facing the side electrode.
9. An ignition distributor for an internal combustion engine according to any one of 9. 11. The radial side wall portion of the power distribution cap has axial tower portions projectingly formed thereon, and ring-shaped step portions are respectively provided on the outer circumferences of the tower portions, and further coupled to the side electrodes. Each of the high voltage cords, each of the side electrodes and each of the high voltage cords is molded with resin to leave the tip side of each of the side electrodes, and each of the molding portions is formed, and each of the tower portions is formed of a ring-shaped step. 11. Each holding member for forming each claw part to be hooked to, and each holding member for mounting the respective mold parts to the respective tower parts with the tip side of the respective side electrodes facing the rotor electrode. An ignition distributor for an internal combustion engine according to any one of them. 12. An igniter for connecting and disconnecting the primary current of the ignition coil, a noise-preventing capacitor, and a capacitor arranged at the opening end side in the coil housing space to integrate the igniter and the capacitor and a connector. 2. An ignition distributor for an internal combustion engine according to claim 1, further comprising an igniter case made of resin integrally molded with. 13. The ignition coil includes a core having two parallel magnetic path portions extending in a direction parallel to a bottom wall of the coil housing portion, and a magnetic path on the bottom wall side of each of the parallel magnetic path portions. Primary coil and secondary coil that are concentrically wound around the portion, a capacitor for noise prevention disposed on the side surface of the magnetic path portion on the side opposite to the bottom wall of the parallel magnetic path portions, and the secondary winding 2. A secondary spool having a rib wound around the coil and extending toward the capacitor to form a space for arranging the capacitor, and an insulating resin material filled in the coil housing space. An ignition distributor for the internal combustion engine described.