| 摘要 |
A control servo valve ( 8 ) is housed inside the casing of an internal combustion engine fuel injector ( 1 ), and has an actuator ( 9 ), a control chamber ( 13 ) communicating with a fuel inlet ( 5 ) and with a fuel outlet passage ( 22 ), and a shutter ( 35 ) movable along an axis ( 3 ) by the actuator ( 9 ) between a closed position and an open position to close and open the outlet passage ( 22 ) respectively; the servo valve ( 8 ) also has a fixed axial rod ( 29 ) interposed between the actuator ( 9 ) and the control chamber ( 13 ); the outlet passage ( 22 ) comes out through an outer lateral surface ( 30 ) of the axial rod ( 29 ); and the shutter ( 35 ) is defined by a sleeve which slides axially on the outer lateral surface ( 30 ), and, in the closed position, closes the outlet passage ( 22 ) so as to be subjected to a zero axial resultant force by the pressure of the fuel.
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