FUEL INJECTOR WITH BALANCED METERING SERVOVALVE, FOR INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To provide a fuel injector with a balanced metering servovalve, for an internal combustion engine. SOLUTION: The injector 1 comprises a balanced metering servovalve 5 for controlling a rod 10 for opening/closing a nozzle. The servovalve has a valve body 7 with a control chamber 26 fitted with an outlet passage 42a that is opened/closed by an axially mobile shutter 47. The shutter is integral with a sleeve 41 separated from the armature 17 and is made of a harder material, machined with extreme precision. The shutter 47 has a sharp edge 45 capable of closing an annular chamber in communication with the outlet passage, so as to keep the sleeve in contact with the armature when the armature is operated by the electro-actuator 15. COPYRIGHT: (C)2009,JPO&INPIT