JPS5923074A - Distributor for internal combustion engine - Google Patents

Abstract

PURPOSE:To keep the noise current suppressing effect for a long while, by coating the discharging top end portion of a rotor electrode made of an electrically conductive ceramic material with a metallic oxide such as a semiconducting material of CuO or the like. CONSTITUTION:The discharging top end portion of a rotor electrode 4 is coated beforehand with a layer of a metallic oxide like CuO or the like. The layer 5 is effective in preventing further oxidative degradation of an electrically conductive ceramic material, so that the production of noise current at the early stage can be prevented. Here, in order to form the coating layer 5 of a metallic oxide, it is also possible to connect a sintered metal 5A consisting of a metallic oxide of other semiconducting material of SnO2, V2O3, Ta2O3, NiO or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ignition distributor for suppressing noise radio waves for an internal combustion engine.

It is a well-known fact that using conductive ceramic as a rotor electrode for a power distribution device has the effect of suppressing radio noise, but when used in actual equipment, due to spark discharge between the rotor electrode tip and cap side electrode, ceramic The discharge part of the rotor electrode deteriorates due to oxidation, and eventually the tip becomes insulated over a wide area, and discharge does not occur from the tip of the ceramic electrode, but rather the surface of the insulated ceramic electrode.
On the contrary, a problem occurs in which the noise radio waves increase.

In order to solve the above-mentioned problems, the present invention has been developed by covering the discharge tip of the conductive ceramic rotor electrode t-pole with a metal oxide such as CuO, which is a semiconductor.
Since the discharging part at the tip of the ceramic rotor electrode is covered with oxide, the purpose is to maintain the initial noise radio wave suppressing effect that will not deteriorate due to oxidation due to dirt.

The present invention will be described below with reference to embodiments shown in the drawings.

In Figures 1 and 2, 1 is an insulating resin distributor cassop, 2 is a center contact piece provided at the center of the cassette, 3 is an insulating resin power distribution rotor, and 4 is a power distribution rotor 3. This is a conductive ceramino cloak electrode that is embedded and molded, and a 6J-side electrode that is embedded and molded in the distributor cassob 1. So°ζ, SiC,
CuO1 is applied to the tip of the rotor electrode 4 made of conductive ceramic such as "r"ic or TiN by thermal spraying or the like.
A metal oxide layer 5 such as AI203 is provided. In the above configuration, if the oxide layer 5 is not provided, spark discharge is constantly generated through the discharge gap g between the tip of the rotor electrode 4 and the side electrode 6, so that the conductive ceramic electrode 4 The discharge section deteriorates due to oxidation.

For example, for a SiC electrode, SiO2 and TiC.

If it is a 1' i N electrode, it will change to 'I'' + 02, and since these 5io2 and Tio2 are insulators, as this oxidation deterioration progresses, the tip of the rotor electrode 4 will eventually become insulated over a wide area. However, since the discharge does not occur from the tip of the ceramic electrode 4 but rather through the insulated surface of the ceramic electrode, a problem arises in that the noise radio waves increase on the contrary.

On the other hand, in this embodiment, the discharging tip of the rotor electrode 4 is covered in advance with an oxide layer 5 such as CuO, so that it will not deteriorate further due to oxidation. The electrode portion is not deteriorated by oxidation, and the initial noise radio wave suppressing effect can be maintained.

As another example of providing an oxide layer, as shown in FIGS. 3 and 4, semiconductors such as C110, Ni0, 5n0
2. ■ Sintered pieces 5Δ made of metal oxides such as 203 and Ta 203 are joined and ζ is also L).

Note that the method for joining the sintered pieces 5A of the metal oxide described above is the +J joint 6 (method using a conductive joining agent, or in order to make the joint more durable, the ceramic electrode 4 and the metal oxide After providing a metal layer of PL and Ni on the bonding surface of the sintered piece 5A, IJ
It's good to do that.

[Brief explanation of drawings]

Fig. 1 shows an embodiment of the configuration of the main parts of the power distributor of the present invention. Fig. 2 is a plan view of the main part of the power distributor shown in Fig. 1 with the rotor removed. FIG. 4 is a plan view showing a rotor in the power distributor shown in FIG. 3; FIG. 4...U-electrode, 5...Metal oxide layer, 5Δ...
A metal oxide sintered piece with an oxide layer. Representative Patent Attorney Takashi Okabe Figure 1 Figure 3

Claims (1)

[Claims] An ignition distributor for internal combustion engines that has an oxide layer on the spark discharge part of a rotor electrode made of conductive ceramic.