PIEZO INJECTOR WITH DIRECT DRIVEN TYPE

摘要

A direct drive piezo injector is disclosed. The disclosed direct drive piezo injector having a guide part in an inside comprises: a body having a spraying part for spraying a fuel to a combustor chamber in a lower part of the guide part; a piezo stack arranged inside the body along an axis direction of the body; a pressure controlling part formed in a lower part of the piezo stack; a niddle, which is arranged in a lower part of the pressure controlling part, for opening and closing the spraying part by being moved up and down by a pressure of the pressure controlling part; an accumulator, which is formed between the piezo stack and the guide part, for storing a fuel provided from an outside; and a fuel inflow path, which is connected to the accumulator, and which is formed by penetrating the body and the needle. According to the present invention, a time and an amount of spraying a fuel, which is sprayed from the injector, can be controlled more minutely by controlling the fuel, which is provided for the injector, by using a movement of the needle.