JPS63106368A - Distributor for internal combustion engine - Google Patents

Abstract

PURPOSE:To aim at preventing a rotor electrode from being broken, by incorporating an electrode protecting part partly covering a rotor, integrally with the rotor electrode secured to the front part of the rotor and made of electric wave noise reducing material such as ferrite, carbon or the like. CONSTITUTION:A distributor is disposed in the center section of its rotor 14 made of in insulator such as synthetic resin or the like, with a rotor electrode 16 in which a center fitting 15 made of wear-resistant metal is mounted by calking or the like. This rotor electrode 16 is formed from electric wave noise reducing materials such as ferrite, carbon, electrically conductive ceramic materials, porous sintered materials impregnated with silicone oil or the like, and is integrally secured by rotor resin. In this arrangement, an electrode protecting part 17 made of the same material as that of the rotor 4 is integrally incorporated with the latter so as to partly cover the upper part and both side surface of the rotor electrode 16, and a predetermined gap 18 is ensured between the upper surface of the rotor electrode 16 and the rotor 4 by this protecting part 17. With this arrangement it is possible to prevent the rotor electrode form being broken.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a distributor rotor used in an ignition device for an internal combustion engine, and in particular, the ignition device for an internal combustion engine is integrally molded. This invention relates to a distributor that is inexpensive and highly effective in suppressing ignition noise.

[Conventional technology]

Noise radio waves generated by the ignition system of internal combustion engines such as automobiles,
In addition to damaging equipment such as televisions and radios, there is also the risk of interfering with the normal operation of electronic equipment such as electronically controlled fuel injection systems and electronically controlled suspension systems installed in automobiles, so efforts should be made to prevent this. Various methods have been researched and developed for this purpose. One of the ways to do this is to use radio noise reduction materials such as ferrite, carbon, conductive ceramic materials, and silicone oil-impregnated porous materials for the rotor electrodes, thereby suppressing the generation of noise radio waves due to spark discharge between the rotor electrodes and the side electrodes. Distributors are known.

[Problem that the invention seeks to solve]

FIG. 1 shows the main parts of a conventional distributor, where 1 is a housing with an open upper end, 2 is a cap that is attached to the opening 1a of the housing 1, and inside the housing 1 is an engine. A camshaft 3 is provided that rotates in conjunction with a crankshaft, and a rotor 4 made of an insulator such as synthetic resin is attached to the tip of the camshaft 3. This rotor 4
is located near the opening la of the housing, and has a conductive plate 5 made of wear-resistant metal in its center, and a radio noise source such as the aforementioned ferrite, carbon conductive ceramic material, silicon-impregnated porous fired member, etc. at one end. Rotor electrodes 6 made of reducing members are embedded in the rotor 4 or fixed with rivets 7, respectively. On the other hand, the cap 2 has a main electrode 8 fixed at the center and a plurality of side electrodes 9 fixed at the periphery. The main electrode 8 is connected to the secondary side of an ignition coil (not shown), and is connected to the conductive plate 5 by a spring 10.
The rotor electrode 6 is connected via the sensor carbon 11 that is in pressure contact with the
It is electrically conductive. The side electrode 9 is connected to each spark plug (not shown), and its inner surface faces the tip surface 6a of the rotor electrode 6 with a small gap G interposed therebetween.

The tip end surface 6a of the rotor electrode 6 is formed in an arc shape concentric with the rotation center of the rotor 4, as shown in FIG. A gap 12 is provided between the rotor 4 and the rotor 4 to prevent burnout of the tip of the rotor 4 due to discharge sparks.

However, since the above-mentioned radio noise reduction member such as ferrite is generally extremely fragile and has low mechanical strength, in the structure shown in FIG. When it hits the tip of rotor electrode 6.

The tip of the rotor electrode 6 is easily damaged, which increases the defect rate and reduces work efficiency. For this reason, as shown in FIG. 3, some rotor electrodes are provided with an electrode protection portion 13 on the upper surface side of the tip portion of the rotor electrode 6. However, in such conventional products, the protection part was provided for a separate function from the electrode fixing, resulting in poor productivity and high cost.

An object of the present invention is to prevent the cap-side electrode from directly contacting the rotor electrode during assembly, to prevent damage to the rotor electrode made of a radio noise reduction member, and to reduce costs by improving productivity.

[Effect]

According to the above configuration, even if the inner electrode of the cap hits the rotor when the rotor is assembled into the housing and the cap is attached, it will not directly hit the side electrode because it is covered by the rotor electrode protection part. No 0 work in progress,
Even if the side electrode is hit, the impact will not be transmitted to the rotor electrode, and damage to the rotor electrode will be reliably prevented. Furthermore, even if the electrode is dropped during one operation, damage can be prevented because the electrode protection part is partially covered with the same material as the rotor.

[Means for solving problems]

A rotor electrode 6 made of a radio noise reduction material such as ferrite, carbon, conductive ceramic material, silicone oil-impregnated porous fired material, etc. is fixed to the tip of the rotor 4, and is partially formed by integral molding with the same material as the rotor 4. By providing an electrode protection part to cover the electrode and also fixing the electrode by integral molding.

The above objectives are achieved.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings. In the following embodiments, since the overall configuration of the distributor is the same as that shown in FIG. 1, only the rotor portion, which is the main part, will be explained.

That is, as shown in FIGS. 5 to 7, a rotor 14 made of an insulator such as a synthetic resin has a sensor ring 15 made of a wear-resistant metal attached to the center thereof by caulking or the like. A rotor electrode 16 made of a reducing member is fixed integrally with rotor resin. Then, an electrode protection part 1 is formed so as to partially cover the upper side 1 and both sides of the rotor electrode 16.
7 is integrally molded of the same material as the rotor 14, and the rotor electrode 16 is also integrated into the rotor 14. Further, a predetermined gap 18 is secured between the electrode protection portion 17 and the upper surface of the rotor electrode 16, and its tip portion 17b is formed in an arc shape equal to the tip edge 16a of the rotor electrode 16. In this embodiment, a flange portion 14a is provided on the lower surface side of the rotor electrode 16 with a gap 18, similar to that in FIG. 1.2.3.4.
According to the above structure, the cap 2 is installed after the rotor 14 is assembled into the housing 1.
Even if the side electrode 9 inside the cap 2 hits the rotor when attaching the rotor electrode 16 to the electrode protection part 17
Since the side electrodes 9 are covered with
Since the gap 18 is provided between the rotor electrode 16 and the rotor electrode 16, even if the rotor electrode 16 is hit very strongly, the impact will not be transmitted to the rotor electrode 16, and damage to the rotor electrode 16 will be reliably prevented, resulting in low cost and improved workability.

Further, even if the rotor 14 is dropped during operation, the rotor electrode 16 is protected by the electrode protection portion 17 and the flange portion 14a. By providing the above-mentioned gap 18, it is possible to prevent the electrode protection portion 17 from being burnt out due to discharge sparks. On the other hand, the gap 18.1 above and below the rotor electrode 16
9 is set smaller than the wall thickness of the electrode protection part 17 and the flange part 14a, so that if a large number of rotors 14
Even if they are mixed together, they will mesh with each other and the rotor electrode 1
6 will not be broken, and parts management will be easier.

〔Effect of the invention〕

As is clear from the present invention, in the power distributor for an internal combustion engine according to the present invention, during the assembly work of the rotor electrode made of ferrite, carbon, conductive ceramic material, silicone oil-impregnated porous fired member, etc., or when the It has the advantages of reliably preventing time damage, reducing the number of parts, being inexpensive, having good stability and workability, and improving reliability as a distributor.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the main parts of a conventional distributor, Figure 2
The figure is a plan view of the rotor, and Figures 3 and 4 are JP-A-60
Figure 5 is a plan view of the rotor portion of the distributor according to the present invention;
FIG. 6 is a side view of the same, and FIG. 7 is a sectional view of FIG. 5. DESCRIPTION OF SYMBOLS 1... Housing, 2... Cap, 3... Camshaft, 4... Rotor, 4a... Flange part, 5...
Conductive plate, 6... Rotor electrode, 8... Main electrode, 9...
- Side electrode, 11... Center carbon, 12... Gap, 13... Electrode protection part, 14... Gap, 15...
・Center Canada, 17... Electrode Protection Department, 18...
gap.

Claims (1)

[Claims] 1. A rotor made of an insulator that is located in the opening of the housing and rotates in conjunction with the rotation of the internal combustion engine, and a porous material impregnated with ferrite, carbon, conductive ceramic material, and silicone oil fixed to the tip of the rotor. A rotor electrode made of a radio noise reduction member such as a fired material, a cap attached to the opening of the housing, and a plurality of electrodes fixed to the cap and facing the tip surface of the rotor electrode via a minute gap. formed on the rotor with a side electrode of
A power distribution device for an internal combustion engine, characterized in that an electrode protection portion that covers a surface of the tip of the rotor electrode facing the cap is integrated with the resin for fixing the rotor electrode.