| 摘要 |
A fuel injector to inject fuel into a cylinder of an internal combustion engine when installed therein, the engine having a high-pressure fuel supply which delivers fuel to the injector and a low-pressure fuel return which removes fuel from the injector. The injector has an injector body which defines an interior cavity, a movable needle valve which cooperates with the interior body to define a variable-volume control chamber and another value for selectively permitting fluid communication between the control chamber and (1) the high-pressure fuel supply; and (2) the low pressure fuel return. Such fluid communication permits controlled variation of the volume of the control chamber which, in turn, varies the position of the needle valve to selectively permit or prevent fluid communication between the high-pressure fuel supply and the engine cylinder. The valve for selectively permitting fluid communication is preferably force balanced by relatively low forces acting thereon.
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