| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To solve problems in a glow plug of a two stage throttling type having: an electrode shaft passed through a main metal fitting; a control coil with one end joined to the electrode shaft; a heat generating coil with one end joined to the control coil; and a sheath attached to the main metal fitting in a state covering the control coil and the heat generating coil, wherein the sheath is formed with a smaller diameter in a leading end than a base end part and a taper part is provided between the leading end and the base end part, and in the two stage throttling type, a junction neighborhood of the control coil and the heat generating coil is easily disconnected and temperature dispersion of the heat generating coil is large in comparison with a type with a straight sheath shape. <P>SOLUTION: In the two stage throttling glow plug, the whole of the heat generating coil 4 is housed in the leading end of the sheath 5, and even the first junction 6 of the control coil 3 and the heat generating coil 4 is housed in the leading end 5b while housing substantially a whole of the control coil 3 in the base end part 5b and in the taper part 5c of the sheath 5. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
