Ngk Spark Plug Company, Limited

Nissan Motor Company Limited

Tsuneo Itoh

Shinichi Yokoi

Hiroshi Kondo

Seishi Yasuhara

Kozo Nishiwaki

In an auxiliary starter apparatus for four-cylinder diesel engine, each cylinder of which has a 12-volt glow plug adapted to be operated by a voltage of 12 volt, each of the four glow plugs has an electrical resistor. There is provided a first state in which each of the two electrical resistors connected in series is connected in parallel to form an electrically conductive path. A second state is provided in which the four electrical resistors are each connected in series to form an electrically conductive path. Electromagnetic relays are placed to alternatively select the first and second state. A 24-volt battery cell is provided, a voltage of which is impressed across the electrically conductive path of the first state by the first and second electromagnetic relay when starting the diesel engine, while the voltage of the 24-volt battery cell impressed across the electrically conductive path of the second state by the first and second electromagnetic relay once the diesel engine has started.

Auxiliary starter apparatus for multi-cylinder diesel engine by using

A dual line ceramic glow plug uses a ceramic heater as an incandescent body which protrudes from the bottom of a metal fitting and which is made of an incandescent wire of a refractory metal embedded in a sintered ceramic powder. The bare ends of the incandescent wire terminate in a pair of metal terminal fittings secured to the end of the ceramic heater within the metal fitting. Electrical leads protruding from the terminal fittings are welded to a pair of terminal electrodes projecting outwardly from the top of the metal fitting. The ceramic heater is held in position by a metal sheath that is slipped over and bonded to the middle portion of said heater. The middle portion of the ceramic heater is brazed to the inner surface of the metal sheath in electrically insulated relation thereto with an intervening glass layer formed on the outer surface of the ceramic heater.

Dual line ceramic glow plug

A rapid heating self-control type glow plug used for starting a Diesel engine, particularly, such a glow plug which is also used for regulating the cylinder or auxiliary combustion chamber temperature following starting and during normal operations of the engine. A resistor wire is connected in series with a heating wire embedded in a ceramic body. The heating wire is formed of a tungsten alloy having a temperature resistance coefficient at 1000.degree. C. no greater than 4 times that at room temperature, while the resistor has a positive temperature resistance coefficient at 1000.degree. C. no less than 5 times that at room temperature. Preferably, the tungsten alloy consists of tungsten and at least one of rhenium, cobalt, thorium, molybdenum and zirconium, with rhenium in an amount of 2 to 50 wt % being preferred, and rhenium in an amount of 10 to 30 wt % being the most preferable. The resistor is preferably a wire made of at least one of nickel, tungsten, molybdenum and iron.

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Aichi, Japan

Tsuneo Itoh