| 摘要 |
<p>PROBLEM TO BE SOLVED: To use the generated heat loss quantity for preheating of fuel by thermally connecting a magnetic coil to a heat exchanging part of a fuel feed path surrounded by the magnetic coil, directly or through a heat transfer coil support body for holding the magnetic coil. SOLUTION: A magnetic coil 21 is wound around a thin coil support body, manufactured as a cylindrical sleeve 29 formed of material with high heat conductivity, particularly metal, so as to bring about thermal contact with excellent heat' conduction between the magnetic coil 21 and a heat exchanging part 6 in a flow hole 3. The 29 is extended to a valve seat body 12 in a flow direction so as to form a valve seat support body. The sleeve 29 transmits the quantity of heat loss, emitted from the magnetic coil 21, radially to a lower reaches core end part 26 facing a needle valve 7 forming the wall of the heat exchanging part 6. In this range, the lower reaches core end part 26 is formed very thin, so that excellent thermal connection is generated between the magnetic coil 21 and fuel flowing through the heat exchanging part 6. Considerable preheating of fuel is thereby attained, and fuel is rapidly evaporated upon coming out of a fuel injection valve.</p> |
