| 摘要 |
<p>An electro-mechanical fuel injector (10) comprising: a housing (12) and valve seat (14) including a valve seating surface (16) and a metering orifice (18) disposed at a lower end (20) of the housing (12). An armature assembly (30) is movable relative to the valve seating surface (16) for opening and closing the metering orifice (18) and includes an armature (32) and a pin (34) extending therefrom and adapted to engage the seating surface (16); a coil assembly (40) and spring (46) are provided to move the armature assembly in a direction to open and close the metering orifice. The injector includes a fluid chamber (50) defined upstream of the metering orifice, in surrounding relation to a portion of the armature assembly (30). A damping assembly (60) is also provided, movable with the armature assembly (30), for generating a viscous shear damping force by interacting with the wall (64) of the chamber (50).</p> |
