Ignition distributor for an internal combustion engine

摘要

An ignition distributor for an internal combustion engine has a cylindrical distributor rotor of synthetic resin, rotated synchronously with the revolution of the engine, and a rotor electrode radially and outwardly extending from the central portion on the upper surface of the rotor. A plurality of circumferential electrodes are disposed in the rotating locus of the rotor and are separated from the rotor electrode by a discharge gap. The rotor electrode has the shape of letter T a vertical portion of which is fixed to the distributor rotor and a horizontal portion of which opposes to the circumferential electrode, being in the shape of a circular segment. The surface of the rotor electrode horizontal portion opposing to the respective circumferential electrodes is formed to have a rugged or wavy profile comprising a plurality of peaks and the rugged surface is coated with a dielectric material such as silicon varnish to provide a low discharge voltage and reduced radio frequency interference in prolonged use.