| 摘要 |
<p>An automotive emission control valve, such as an EGR valve, has a solenoid for operating a valve element. The solenoid stator has an annular air gap disposed within an electromagnet coil. An annular wall of an armature is disposed in the air gap. The armature is displaced by magnetic flux in the air gap. The air gap is cooperatively defined by juxtaposed walls of the stator that are spaced radially a distance greater than radial thickness of the annular wall of the armature. The annular wall of the armature is disposed radially intermediate the stator walls and spaced from each stator wall. The radially inner stator wall is tapered. Lost-motion is present between the armature and valve element so that initial armature displacement is not transmitted to the valve element. Dimensions of the stator walls and armature at the air gap may be selected to improve linearity of operaton.</p> |
