| 摘要 |
A body 600 of a fuel injector 1000 according to the present invention includes: a needle valve mechanism 200 including a needle valve 252 provided near a nozzle portion 250, and a fuel chamber 254; a needle valve actuator 230 mounted with a piston 235 on a center, wherein a spring 240 is disposed into the piston 235; a booster 300 disposed between the needle valve mechanism 200 and a pilot valve 400, and having only a spring-free piston 350; the pilot valve 400 operating by a pressure difference between supplied fuel pressure and working pressure of a solenoid valve 500; and the solenoid valve 500 controlling working pressure of fuel to operate the needle valve actuator 230. |
