| 摘要 |
<P>PROBLEM TO BE SOLVED: To facilitate opening/closing a needle valve by reducing pressure applied to a needle valve back part when the needle valve is opened, and inject fuel at high injection pressure with good controllability without increasing attraction force, in an injector using a method for directly driving the needle valve by an electromagnetic drive part. Ž<P>SOLUTION: In the injector I, an armature part 1a is integrally provided in a base end part of the needle valve 1 stored in a bar-shaped body 2, and attraction is enabled by a solenoid 5 in the electromagnetic drive part. In the armature part 1a, back pressure of a pressure control chamber 7 communicated with a high-pressure fuel supply passage is applied, and a control valve 6 for opening/closing a space between the pressure control chamber 7 and a low-pressure fuel outflow passage is attracted and driven by the solenoid 5. When the back pressure of the pressure control chamber 7 is declined to predetermined pressure, the needle valve 1 is lifted by the attraction force of the solenoid 5. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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