| 摘要 |
<p>An electromagnetic fuel injector for use in a spark ignition internal combustion engine and, in particular, for use in a low pressure, throttle body fuel injection system for such an engine. The fuel injector includes an electromagnet actuated valve having a semi-spherical seating surface thereon for cooperation with an annular valve seat at one end of a nozzle assembly for controlling the injection flow of fuel from the injector and a flat surface for abutment against the end of the armature of an electromagnet. This valve is biased toward a closed position in seating engagement against the valve seat by a spring associated with the armature and is biased toward an open position relative to the valve seat by an opposed spring upon energization of the electromagnet. The electromagnet structure includes a small diameter axial extending small diameter guide pin slidably received in a guide bore of the armature for reducing sliding friction of the armature. In a preferred enbodiment the nozzle assembly is threaded into the injector body to abut against a deformable abutment shoulder whereby the stroke of the armature-valve can be adjusted.</p> |
