FUEL INJECTOR AND CALIBRATION TUBE THEREOF

摘要

A fuel injector includes a valve member for selectively preventing and permitting flow of fuel through a valve seat by selectively engaging and disengaging the valve seat, an actuator for selectively applying a force to the valve member in order to unseat the valve member from the valve seat, and a return spring which biases the valve member into contact with the valve seat when the actuator is not applying the force to the valve member. A calibration tube is positioned within the fuel tube and holds the return spring in compression so as to set a force on the return spring to achieve a desired dynamic flow of fuel through the fuel injector. The calibration tube includes at least one protrusion extending outward therefrom such that the protrusion engages the fuel tube, thereby creating a spring fit between the calibration tube and the fuel tube.

主权项

1. A fuel injector for supplying fuel to a fuel consuming device, said fuel injector comprising:
a fuel inlet for receiving said fuel; a fuel outlet for dispensing said fuel from said fuel injector; a fuel tube defining a fuel passage at least in part from said fuel inlet to said fuel outlet; a valve member for selectively preventing and permitting flow of said fuel through a valve seat by selectively engaging and disengaging said valve seat; an actuator for selectively applying a force to said valve member in order to unseat said valve member from said valve seat; a return spring which biases said valve member into contact with said valve seat when said actuator is not applying said force to said valve member; a calibration tube positioned within said fuel tube such that said return spring is held in compression between said valve member and said calibration tube, said calibration tube being positioned within said fuel tube so as to set said force on said return spring to achieve a desired dynamic flow of fuel through said fuel injector, wherein said calibration tube includes at least one protrusion extending outward therefrom such that said at least one protrusion engages said fuel tube, thereby creating a spring fit between said calibration tube and said fuel tube.