JPS603483A - Ignition distributor - Google Patents

Abstract

PURPOSE:To improve adiabatic property and radiation property of a rotor electrode by spacing the neiborhood of an end at the side electrode side of the rotor electrode from the upper surface of a rotor arm portion to provide a radiation fan and notch in a portion projecting from a contact portion of the rotor electrode with the rotor arm portion. CONSTITUTION:The side eldctrode side end 5a of a rotor electrode 5 and the neiborhood thereof are spaced from the upper surface of a rotor arm portion 4 and project from a contact portion of the rotor electrode 5 with the rotor arm portion 4. This projecting portion is provided with a radiation fan 11 and a circular notch 12. Further, between said projecting portion and a side electrode side end 4a is provided a radiation gap 13. Thus, high voltage resisting property of a rotor 3 is maintained while the radiating property and adiabatic property of the rotor electrode 5 can be improve respectively by the radiation fin 11 and the notch 12. Hence, even when high energy is supplied through an ignition distributor, the rotor arm portion 4 contacting the rotor electrode 5 can be prevented from fusion.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an ignition distributor for internal combustion engines, and in particular to an ignition distributor suitable for high-energy ignition.

[Background of the invention]

FIG. 1 is a diagram showing a conventional (Japanese Unexamined Patent Publication No. 56-115865) general ignition power distribution device for internal combustion engines, and FIG. 2 is a diagram showing its rotor portion.

To roughly explain its structure, there is a rotor shaft 2 at the center of the housing 1 that rotates in conjunction with the camshaft of the engine, and a rotor 3 made of an insulating material such as synthetic resin is attached to the rotor shaft 2.
or installed. A rotor electrode 5 is attached to the arm portion 4 of the rotor 3 and rotates together with the rotor 3.

On the other hand, at the center of the cap 6 attached to the housing 1 is a center terminal 7 connected to an ignition coil, and a center carbon 9 is connected to the center terminal 7 via a coil spring 8. A plurality of side electrodes 10 connected to a spark plug are arranged around the power distributor cap 6, and the engine is operated 11''I.

The rotor electrode 5 rotates while being in contact with the center carbon 9.
Electricity is distributed to the spark plaque of each cylinder by the discharge generated between the side electrode 10 and the side electrode 10.

However, in such a conventional ignition distributor, one side of the rotor electrode 5 is in close contact with the rotor arm portion 4 over almost the entire surface, and the heat dissipation area of the end portion 5a on the side electrode side of the rotor electrode 5 is small. In particular, it is used in high-energy ignition systems where, after the insulation between the spark plug gaps is destroyed by the secondary induced voltage of the ignition coil, a low-voltage, large current is passed from a pre-charged capacitor through the secondary side of the ignition coil to produce a superimposed discharge. In this case, the tip portion 5a of the side electrode 5 of the rotor electrode 5 becomes extremely hot during the discharge between the side electrode 10 and the side electrode 10.
There was a problem in that the rotor arm portion 4 in contact with the rotor electrode 5 was damaged by melting.

[Purpose of the invention]

An object of the present invention is to provide a durable ignition distributor suitable for high-energy ignition, which prevents the rotor arm portion from being eroded due to overheating of the rotor electrode as described above.

[Summary of the invention]

In order to achieve the above object, in the present invention, the vicinity of the end of the side electrode of the rotor electrode is separated from the upper surface of the rotor arm so that it protrudes from the contact part of the rotor electrode with the rotor arm, and a heat dissipation fin is provided on this protruding part. In addition, a notch is provided at an intermediate portion between the contact portion of the rotor electrode and the heat dissipation fin to improve the heat dissipation and heat insulation properties of the rotor electrode.

[Embodiments of the invention]

Figures 3 and 4 show an embodiment of the present invention, in which a rotor electrode 5 is attached to the arm part 4 of the rotor 3 made of an insulating material such as synthetic resin, and the ignition timing can be adjusted within a range. Therefore, the conventional method shown in FIGS. 1 and 2 is to distribute power to the spark plug by discharge between the side electrode side tip 5a of the rotor electrode 5, which is formed in an enlarged arc shape, and a side electrode (not shown). Although it is the same as the example, in this example, the side electrode side tip portion 5a of the rotor electrode 5 and its vicinity are separated from the upper surface of the rotor arm portion 4 and protrude from the contact portion of the rotor electrode 5 with the rotor arm portion 4, A radiation fin 11 is provided in this protruding portion, and a circular notch 12 is provided in an intermediate portion between the contact portion of the rotor electrode 5 and the radiation fin 11. The heat dissipation fins 11 are preferably provided by bending upward the both sides of the side electrode end portion 5a enlarged into an arc shape of the rotor electrode 5 as shown in the figure.In this way, a sufficiently large heat dissipation area can be obtained. , and as the rotor 3 rotates, the radiation fins 11
Both sides are in contact with the air flow, resulting in good heat dissipation. 1
Reference numeral 3 denotes a heat dissipation gap formed between the portion of the rotor electrode 5 that protrudes from the contact portion with the rotor arm portion 4 and the side electrode side tip portion 4a of the rotor arm portion 4, with both sides extending from the circumference of the rotor 3. It is open in the direction.

The end portion 4a of the rotor arm portion 4 on the side electrode side is the rotor electrode 5.
The creepage insulation distance required to prevent high voltage leakage between the
It has high pressure resistance.

When the ignition distributor according to this embodiment is used in the above-described high-energy ignition device using superimposed discharge, the rotor electrode 5
By injecting high energy several times the normal ignition energy during discharge between the rotor electrode 5 and the side electrode
A large amount of heat is generated at the tip 5a of the side electrode 5a, or the side electrode of the rotor electrode 5 is heated due to the air flow generated in the heat radiation gap 13 as the rotor 3 rotates and the air flow flowing along the heat radiation fins. Heat dissipation from the side tip 5a is performed well, and the notch 12 provided in the rotor electrode 5 reduces the heat transfer area from the side electrode side tip 5a of the rotor electrode 5 to the contact portion with the rotor arm 4, resulting in heat insulation. Since the contact area of the rotor electrode 5 with the rotor arm part 4 does not reach a high temperature unlike the conventional case, it is possible to prevent the rotor arm part 4 made of synthetic resin etc. from melting. can.

〔Effect of the invention〕

As described above, in the present invention, the vicinity of the tip end of the side electrode of the rotor electrode is separated from the upper surface of the rotor arm part so as to protrude from the contact part with the rotor tour 4 part of the rotor electrode, and the radiation fin 11 is attached to this protruding part. By providing the notches 12, it is possible to improve the heat dissipation and insulation properties of the rotor electrodes while maintaining the high pressure resistance of the rotor, and to inject energy several times higher than normal ignition energy through the ignition distributor. Even in the case where the rotor arm is in contact with the rotor electrode, it is possible to prevent melting and damage of the rotor arm portion that comes into contact with the rotor electrode, thereby providing sufficient durability.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing a conventional ignition distributor, Fig. 2 is a view showing its rotor part, (al is a plan view, (b) is a side sectional view, and Fig. 3 is an embodiment of the present invention. In the example diagrams, (a) is a plan view, (b) is a side sectional view, and FIG. 4 is a perspective view showing the rotor electrode. 3: Loaf 4: Rotor arm portion 5: Rotor electrode 5a: Electrode side electrode side tip 6: Distributor cap 10: Side electrode 11: Heat dissipation fin 12: Notch 13: Heat dissipation gap Agent patent attorney Nakaso Junnosuke Volume 2M 1-3 Figure 11 Bow

Claims (1)

[Claims] In an ignition distributor that distributes power to the ignition plug through discharge between the rotor electrode attached to the arm of the rotor and the side electrode attached to the distributor cap, the tip of the rotor electrode on the side electrode side. The vicinity is separated from the upper surface of the rotor arm portion to protrude from the contact portion of the rotor electrode with the rotor arm portion, and a heat radiation fin is provided on this protruding portion, and a heat radiation fin is provided between the contact portion of the rotor electrode and the heat radiation fin. An ignition power distribution device characterized by having a notch in a part.