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) an armature slidably disposed in said axial bores in said polepieces; d) a bearing axially disposed in one of said polepieces; and e) 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, wherein said bearing-containing polepiece is provided with ventilative means for permitting the draining and evaporation of fluid from within said solenoid.
- 2. A solenoid in accordance with claim 1 wherein said ventilative means comprises at least one passageway extending between an interior central region and the exterior of said solenoid.
- 3. A solenoid in accordance with claim 2 wherein said at least one passageway is labyrinthine.
- 4. A solenoid in accordance with claim 1 wherein said ventilative means comprises at least one passageway extending between an interior peripheral region and the exterior of said solenoid.
- 5. A solenoid in accordance with claim 1 wherein said ventilative means comprises at least one passageway extending between an interior central region and the exterior of said solenoid and at least one passageway extending between an interior peripheral region and the exterior of said solenoid.
- 6. A solenoid in accordance with claim 5 further comprising a housing surrounding said electrical conductor, an annular space being provided between said housing and said electrical conductor.
- 7. A solenoid in accordance with claim 1 wherein said bearing-containing polepiece further comprises at least one depression on an axial surface thereof for thermally insulating said polepiece from said electrical conductor.
- 8. A valve assembly for exhaust gas recirculation between an exhaust manifold and an 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, an armature slidably disposed in said polepieces, a bearing axially disposed in one of said polepieces, 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, and
said bearing-containing polepiece being provided with ventilative means for permitting the draining and evaporation of fluid from within said solenoid.
- 9. 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, an armature slidably disposed in said polepieces, a bearing axially disposed in one of said polepieces, 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, and said bearing-containing polepiece being provided with ventilative means for permitting the draining and evaporation of fluid from within said solenoid.
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims the benefit of U.S. Provisional Application, Ser. No. 60/184,571, filed Feb. 24, 2000.
Provisional Applications (1)
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Number |
Date |
Country |
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60184571 |
Feb 2000 |
US |