Hitachi, Ltd.

Nissan Motor Company Limited

Hiroji Sawada

Tatsuo Igawa

Hiromitsu Nagae

A distributor for distributing high-voltage pulses generated by an ignition coil to individual ignition plugs through a center electrode, a rotor electrode and a plurality of side electrodes disposed opposite to the rotor electrode with a discharge gap defined therebetween, in which the discharge-participating area of the rotor electrode and/or each side electrode includes finely interspersed conductive regions and high-resistance regions thereby reducing the discharge voltage at the discharge gap between the rotor electrode and each side electrode for suppressing generation of radio noises. The discharge participating areas of the rotor and stationary electrodes may be formed of ferrite.

Distributor

A distributor for distributing a high voltage from an ignition system of an internal combustion engine to sparking plugs arranged so as to oppose to the rotating electrode through very small gaps is improved by the provision of a filmy layer made of an oxide of an alkaline-earth metal which is formed on the discharge portion of the rotating electrode or the surface of each of the fixed electrodes.

Growing community of inventors

Hitachi, Japan

Hiroji Sawada