Glow plug for diesel engine

Abstract

Abstract PURPOSE:To concentrate large electric current at the tip side of the plug at the start of its energizing in order to make red hot glowing possible by a structure wherein two kinds of spiral heating elements, of which the element provided at the rear end side is made of low carbon steel having resistance with enough larger positive temperature coefficient than the temperature coefficient of the resistance of the material of the element provided at the tip side of the plug, are employed in the plug. CONSTITUTION:A sheath 1 made of heat resisting ferrous material such as stainless steel or the like is held by a housing 2, at the rear end part of which an electrode is fitted concentrically through an insulating bushing 3 so as to insert the tip of the electrode into the sheath 1. Furthermore, the first spiral heating element 5, which is made of electric conducting material having the resistance with small temperature coefficient such as Fe-Cr alloys, Ni-Cr alloys or the like, is arranged within the interior space of the sheath 1 at the tip side along the axis line direction of the sheath 1. In addition, the second spiral heating element 6, which is made of electric conducting material having the resistance with enough larger positive temperature coefficient than the temperature coefficient of the resistance of said heating element 5, is arranged within the interior space of the sheath 1 at the rear end side. The one end of the heating element 6 is connected to the heating element 5 and the other end is connected to the electrode 4.

Inventors

• 👤 Hiroji Hatanaka
• 👤 広二 畑中

Bibliographic Details