PURPOSE: To obtain an efficient heating function for fuel and air, by constituting a hot spot, provided in a predetermined position in a combustion chamber for injected fuel to pass through, of a heat generating unit, which is electrically heated, and a heat generated unit of large thermal capacity brought into contact with the heat generating unit.
CONSTITUTION: A cylindrical member 7, mounted by a thread to a cylinder head, mounts a heat generated bottom end of the member 7 inserted into a combustion chamber, and this hot spot 2, comprising the heat generated unit 8 and a heat generating unit 9 arranged along the internal peripheral surface of the heat generated unit 8, screws the point end part of a fuel injection valve 1 to be fitted to an upper end part of the cylindrical member 7. The heat generated unit 8, consisting of ceramics of alumina or the like with a large thermal capacity further with excellence in insulation resistance, etc., forms space communicating with internal space of the cylindrical member 7 while a hole 8a communicating with inside the combustion chamber 3. While the heat generating unit 9, consisting of an electric resistance material, is arranged along the internal peripheral surface of the heat generated unit 8, and the heat generating unit 9 is coated on the upper with an insulating protective layer 11.
INOUE HIDEHIKO
KONDO TOSHIO
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