Claims
- 1. A solenoid for providing linear actuation, comprising:
a) first and second polepieces having first and second respective axial bores coaxially disposed along a common axis; b) an electrical conductor wound around said polepieces in a plurality of turns; c) a lubricious sleeve disposed in one of said first and second axial bores; d) an armature slidably disposed in said sleeve; e) a bearing axially disposed in the polepiece other than the polepiece containing said sleeve; and f) a shaft attached coaxially to said armature and extending through a supportive bore in said bearing, said shaft being axially displaceable by electromagnetic displacement of said armature to provide said actuation.
- 2. A solenoid in accordance with claim 1 wherein said armature is separated from said polepiece other than the polepiece containing said sleeve by a generally cylindrical air gap.
- 3. A solenoid in accordance with claim 1 further comprising a housing surrounding said polepieces and said wound conductor, said housing being intimately connected to said polepieces at interfaces characterized by substantially zero reluctance.
- 4. A solenoid in accordance with claim 3 wherein said housing is joined to each of said polepieces by magnetic forming.
- 5. A solenoid in accordance with claim 1 wherein said solenoid is included in an actuator attachable to a device for providing linear actuation to said device.
- 6. A solenoid in accordance with claim 1 wherein the respective diameters of said bearing bore and said shaft are as nearly identical as is possible without engendering drag on said shaft.
- 7. A valve assembly for exhaust gas recirculation between the exhaust manifold and the intake manifold of an internal combustion engine, said assembly including an exhaust gas recirculation valve and further including a solenoid actuator attached to said valve, said solenoid actuator having first and second polepieces having first and second respective axial bores coaxially disposed along a common axis, an electrical conductor wound around said polepieces in a plurality of turns, a lubricious sleeve disposed in one of said first and second axial bores, an armature slidably disposed in said sleeve, a bearing axially disposed in the polepiece other than the polepiece containing said sleeve, and a shaft attached coaxially to said armature and extending through a supportive bore in said bearing, said shaft being axially displaceable by electromagnetic displacement of said armature to provide said actuation.
- 8. An internal combustion engine, comprising
a) an intake manifold; b) an exhaust manifold; and c) a valve assembly for exhaust gas recirculation between said exhaust manifold and said intake manifold, said assembly including an exhaust gas recirculation valve and further including a solenoid actuator attached to said valve, said solenoid actuator having first and second polepieces having first and second respective axial bores coaxially disposed along a common axis, an electrical conductor wound around said polepieces in a plurality of turns, a lubricious sleeve disposed in one of said first and second axial bores, an armature slidably disposed in said sleeve, a bearing axially disposed in the polepiece other than the polepiece containing said sleeve, and a shaft attached coaxially to said armature and extending through a supportive bore in said bearing, said shaft being axially displaceable by electromagnetic displacement of said armature to provide said actuation.
CROSS-REFERENCE TO RELATED-APPLICATIONS
[0001] This application claims the benefit of U.S. Provisional Application Serial No. 60/184,514, filed Feb. 24, 2000.
Provisional Applications (1)
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Number |
Date |
Country |
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60184514 |
Feb 2000 |
US |