| 摘要 |
An emission control valve is operated by an electric actuator that has an electric coil, stator structure, and a positioning mechanism, including an armature that is selectively positionable along an axis, for selectively positioning a valve element. The stator structure is separated from the armature by an air gap that includes a non-ferromagnetic guide sleeve that is in surface-to-surface contact with the armature for guiding armature motion along the axis. The guide sleeve and the stator structure are in surface-to-surface contact for mutually concentricity with the axis. Along a region of mutual overlapping a minimum air gap is provided between the guide sleeve and the stator structure by radial spacing between the stator structure and the guide sleeve. Various embodiments are disclosed.
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