| 摘要 |
<p>A typical solenoid-operated fuel injector (10) comprises a housing (12) forming an enclosure which contains a solenoid coil (24) that is selectively energized by electric current to operate the fuel injector. An inlet connector tube (14) extends into a stator (16) to convey liquid fuel into the enclosure, to a valve (27) via which fuel is ejected from the enclosure. A valve needle (22) is disposed within the enclosure between the stator (16) and the valve (27) and is operated by the solenoid coil (24) acting through a spring-biased armature (20) to open and close a flow path through the enclosure between the inlet connector tube and the valve. The stator (16) forms a portion of a magnetic circuit path that directs magnetic flux across a working gap (28) that is disposed within the enclosure between an end of the stator and one side of the armature (20) wherein the one side of the armature causes impact forces to be exerted axially on the stator during the opening and closing of the flow path. In accordance with the present invention, impact-minimization means (30) are provided to minimize the effect of such impact forces, and the impact-minimization means comprises on the armature (20) multi-dimensional fluid passages (30) through the armature that minimizes the effect of such impact forces in comparison to the effect of such impact forces in the absence of the multi-dimensional fluid passages.</p> |
