Patent ID: 7635826

Claim:
A glow plug which includes a built-in sensor and which is adapted to be attached to an internal combustion engine, comprising: a heater member having a heater conductor which generates heat upon energization, said heater member disposed at an axially front end of the glow plug along an axis of the glow plug; a plurality of heater power lead wires each having a conductor and a coating layer which covers the conductor and is formed from an insulating resin, said heater power lead wires extending axially rearward, the conductors electrically communicating with one end of the heater conductor so as to supply power to the heater conductor; a sensor portion which outputs predetermined information concerning the internal combustion engine or the glow plug; at least a single sensor connection line covered with an insulating resin, connected directly or indirectly to the sensor portion, said sensor connection line extending axially rearward from the sensor portion; an enclosing member circumferentially enclosing a rear end portion of the heater member, front-end portions of the heater power lead wires, at least a portion of the sensor portion, and a front-end portion of the sensor connection line; and a grommet disposed in a rear end portion of said enclosing member, said grommet being formed from an insulating, rubber-like elastic material and forming a liquid-tight seal with said enclosing member, said grommet having a plurality of insertion holes that extend axially therethrough, said heater power lead wires and said sensor connection line extending through said insertion holes, said grommet forming a fluid-tight seal around said heater power lead wires and the sensor connection line.