| 摘要 |
A fuel injector ( 1 ) for an internal-combustion engine has a shell ( 2 ) provided with two opposite terminal portions; the first terminal portion ( 4 ) has an inlet ( 7 ) for supply of the fuel and is generally designed to extend outside the engine, whilst the second terminal portion ( 5 ) has a nozzle ( 9 ) communicating with said inlet ( 7 ), is designed to be housed in the engine and has, in the radial direction, dimensions smaller than those of the first portion ( 4 ); the injector ( 1 ) further has an actuator ( 16 ) and a servo valve ( 15 ) housed in the first terminal portion ( 4 ); the servo valve ( 15 ) is provided with an open/close element ( 32 ), which can slide axially, under the action of the actuator ( 16 ) and substantially in a fluid-tight way, in a seat ( 27 ) and is subjected to an axial resultant of pressure of the fuel that is substantially zero; the fuel inlet ( 7 ) is made laterally in an intermediate axial position between the actuator ( 16 ) and the nozzle ( 9 ).
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