| 摘要 |
PURPOSE: A fuel injector is provided to improve the property of gas being discharged from a diesel engine. CONSTITUTION: A fuel injector comprises a needle valve tool (200), a needle valve actuator (230), a booster (300), a pilot valve (400), and a solenoid valve (500). The needle valve tool comprises a needle valve (252) installed near a nozzle unit (250) and a combustion chamber (254). The needle valve actuator comprises a piston (210) with a spring (240). The booster comprises first, second, and third chambers (310, 320, 330) at upper, middle, and lower parts around a piston (350), and has a piston without a spring. The pilot valve is operated by pressure difference between supply fuel and solenoid valve. The pilot valve comprises a spool (475) and a spacer (485) on the spool. The solenoid valve controls the pressure applied to the fuel in order to operate the pilot valve or needle valve actuator. An orifice (550) is installed at one side of the solenoid valve. |
