| 摘要 |
PROBLEM TO BE SOLVED: To control the lift of a needle valve with high accuracy even at the time of a low output of an engine, and stably inject fuel in all output zones of the engine by arranging, on a lower part of an upper spring receiver, a stopper for restricting the lift of the needle valve while deforming with volume change of thermal expansion liquid, and appropriately controlling a temperature of the thermal expansion liquid. SOLUTION: In a valve main body 40, a needle valve 4 is fitted to a nozzle 31 in which an injection hole 5 is drilled on a tip end freely to perform reciprocating motion, and both upper and lower end parts of the needle valve 4 are supported by both upper and lower spring receivers 7, 9. In this case, a needle valve lift stopper 10 is disposed on a lower surface of the upper spring receiver 9, and thus thermal expansion liquid whose volume is expanded by means of heating is filled freely to deform. A temperature of the thermal expansion liquid detected by a temperature sensor of a heating part-cum-temperature detection 11 is inputted to a control device 12, and the power of heating wire of the heating part-cum-temperature detection 11. The thermal expansion liquid is expanded, the needle valve lift stopper 10 is deformed, and the lift of the needle valve 4 is controlled with high accuracy. |
