Ignition distributor with noise suppression electrodes

Ignition distributor for an internal combustion engine having

• a fixed electrode means including a plurality of fixed electrodes (15, 16) located on the circumference of an imaginary cylindrical surface;
• connection means (20) connecting each of said electrodes to a spark plug wire (17', 18') for connection to a respective spark plug (17, 18);
• a distributor rotor (10);
• a central distributor contact (9, 116) on the rotor;
• means (8) connecting said contact to the secondary (7) of a spark coil (4);
• and a terminal electrode means (13, 13') on the rotor (10) to provide a connecting spark gap in conjunction with a respective fixed electrode as the electrode means on the rotor rotates past the fixed electrodes,
• at least one of the electrode means (13, 13', 15, 16) including in its electrical conduction path a resistance material having a resistance sufficiently high to form a radio interference noise suppression resistance,
• wherein, in accordance with the invention,
• said at least one electrode means comprises a composite structure having a substrate carrier (113) of insulating material and a high-resistance, or semiconducting characteristic electrode layer (119;116, 114, 116) located on said substrate, and
• said layer comprises a metal silicide.

Ignition distributor for an internal combustion engine having

• a fixed electrode means including a plurality of fixed electrodes (15, 16) located on the circumference of an imaginary cylindrical surface;
• connection means (20) connecting each of said electrodes to a spark plug wire (17', 18') for connection to a respective spark plug (17, 18);
• a distributor rotor (10);
• a central distributor contact (9, 116) on the rotor;
• means (8) connecting said contact to the secondary (7) of a spark coil (4);
• and a terminal electrode means (13, 13') on the rotor (10) to provide a connecting spark gap in conjunction with a respective fixed electrode as the electrode means on the rotor rotates past the fixed electrodes,
• at least one of the electrode means (13, 13', 15, 16) including in its electrical conduction path a resistance material having a resistance sufficiently high to form a radio interference noise suppression resistance,
• wherein, in accordance with the invention,
• said at least one electrode means comprises, as said resistance material, a ceramic--metal mixture in which the metal forms, simultaneously, the binder, and the electrical conductive component of said electrode means, and
• said ceramic-metal mixture comprises at least one of:
• aluminum oxide--molybdenum;
• nickel oxide--tungsten;
• aluminum oxide titanium oxide--nickel;
• chromium silicate--silicon;
• silicon carbide--chromium nickel;
• boron carbide--nickel.