| 摘要 |
PROBLEM TO BE SOLVED: To provide a pressure accumulation unit injector capable of increasing the number of times of injection per cycle of an engine and ensuring high responsiveness by directly releasing a valve closing force of a needle valve by an actuator.SOLUTION: A piezo actuator 3 that is an actuator is configured such that one end portion 36 thereof is supported by and provided in a nozzle main body 1 around a push rod 5 in the nozzle main body 1 and that the other end portion 37 thereof is arranged to face a flange part 35 of the push rod 5. When being urged, the piezo actuator 3 lifts the push rod 5 and a needle valve 2 is set free and lifted by a fuel pressure to open an injection hole 17, whereby pressurized fuel 30 supplied from a fuel pressurizing chamber 22 or a pressure accumulation chamber 23 is injected from a fuel reservoir 33 via a fuel path 49 and the injection hole 17. |
