摘要 |
An internal combustion engine fuel injector ( 1 ) has a rod ( 10 ) movable along an axis ( 3 ) to open/close a nozzle, and a servovalve ( 7 ) having a control chamber ( 23 ) with a discharge passage ( 26 ) which is opened/closed by a shutter ( 17 ) movable axially under the control of an electro-actuator ( 14 ); the servovalve ( 7 ) also has a fixed axial rod ( 33 ) having an outer lateral surface ( 34 ) through which the discharge passage ( 26 ) comes out; the shutter ( 17 ) is fitted to the axial rod ( 33 ) to slide axially in substantially fluidtight manner, and, when closing the discharge passage ( 26 ), is subjected to substantially zero resultant axial pressure by the fuel; and the control chamber ( 23 ) is bounded radially by a tubular portion ( 8 ) formed in one piece with said axial rod ( 33 ).
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