Ngk Spark Plug Company, Limited

Hiroshi Harada

Yoshihiro Yamamoto

Akimitsu Sassa

Toshiki Hirokawa

Kenjiro Nishiyuki

Masahiro Kawakatsu

A glow plug having a rod-shaped heater including a resistance heating element; a tubular metallic shell; a rod-shaped inner shaft accommodated in the metallic shell and to which electric current is applied externally; and a conductive tubular member disposed inside the metallic shell. The tubular member has openings at its opposite ends. The rear end of the heater is press-fitted into one of the openings, and the front end portion of the inner shaft is inserted into the other opening, whereby the resistance heating element and the inner shaft are electrically connected. The heater includes an electrode terminal portion formed on the outer circumferential surface thereof. The tubular member includes an intermediate portion located between the one end and the other end and in contact with the electrode terminal portion, and the wall thickness at the one end is smaller than the wall thickness at the intermediate portion.

Glow plug

A glow plug including a heater () having a rear heat-generating element () formed of a resistance heat-generating element, and provided in an axial region thereof between a forward end () of a housing and a rear end () of a displacement member () located rearward of the forward end (). The heat-generating element () is arranged separately from a forward heat-generating element () provided at a forward end portion of the heater.

Glow plug with combustion pressure sensor

A pressure sensor including a rod-shaped member, a tubular housing, a variable member and a pressure measuring element. The variable member is entirely disposed within the housing, is connected to the housing and the rod-shaped member, and deforms when the rod-shaped member is displaced relative to the housing along an axial direction. The variable member includes a first portion connected to the rod-shaped member, a second portion connected to the housing, and a bent portion which connects the first portion and the second portion to each other and has a bent shape. A portion of the second portion is a pressure receiving portion which displaces the rod-shaped member in the axial direction when receiving a pressure. The pressure receiving portion of the second portion has a substantially uniform thickness, and the thickness of the pressure receiving portion of the second portion is larger than that of the first portion.

Growing community of inventors

Tajimi, Japan

Hiroshi Harada