US 4,625,085 AGranted

Material for high frequency suppression and distributor for combustion engine composed of the same material

AssigneesNippondenso Co., Ltd., Toyota Jidosha Kabushiki Kaisha

InventorsIchiro Yoshida, Morihiro Atsumi, Shunzo Yamaguchi, Naotaka Nakamura, Kenji Yagi

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Abstract

A distributor having electrodes made of a sintered body composed of a composite material such that the distributor can suppress radio noises to thereby prevent electric interference. The material for the electrodes, the sintered body, is composed of 45-90 mol % of zinc oxide and 55-10 mol % of ferrite, which can suppress radio noises generated between the electrodes due to spark discharging. At the same time, the energy loss within such composite material is small and consumption of electrode can be restrained. Electrode durability is further improved by including bismuth oxide, manganese oxide and cobalt oxide in the electrode material. An ignition plug and electric discharge machine can also advantageously use the electrodes composed of such materials.

Claims4

Dependent claims

A distributor comprising:

a center electrode;
a rotating electrode rotating in connection with said center electrode;
a plurality of fixed electrodes sequentially opposed to said rotating electrode to form a narrow gap therebetween and each electrically connected to each of an associated ignition plug;
wherein said distributor distributes a high voltage generated by an ignition coil to said ignition plugs via said center electrode, said rotating electrode, and said fixed electrode through a spark discharge occurred at said narrow gap between said rotating electrode and one of said fixed electrodes;
and wherein
at least one of (a) said rotating electrode or (b) said plurality of fixed electrodes is composed of a sintered ceramic consisting essentially of a mixture of 45-90 mol % of zinc oxide (ZnO) and 55-10 mol % of ferrite.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/639,204Filed 9 Aug 1984
Priority: JP 58-15180519 Aug 1983
Granted: 25 Nov 1986
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

F02P 7/023
Mechanical distributors: with magnetically controlled mechanical contacts
C04B 35/453
Based on oxide ceramics: based on zinc, tin, or bismuth oxides or solid solutions thereof with other oxides, e.g. zincates, stannates or bismuthates
F02P 7/025
Mechanical distributors: with noise suppression means specially adapted for the distributor
H01T 7/00
Rotary spark gaps, i.e. devices having one or more rotating electrodes