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US 2001/0032633 A1Published application
Magnetically-efficient solenoid for a linear actuator
AssigneeDelphi Technologies, Inc.
InventorsRaul A. Bircann, Dwight O. Palmer
Life of this patent
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AssigneeDelphi Technologies, Inc.
InventorsRaul A. Bircann, Dwight O. Palmer
Estimating the term…
An improved solenoid for providing linear actuation. The outer polepiece of the solenoid is provided with an axial journal bearing for supporting an actuating shaft extending from the solenoid armature. Radial tolerance between the bearing inner bore and the shaft is as small as in practically possible, which feature permits elimination of the prior art portion of the guiding sleeve extending into the outer polepiece, thereby retaining frictional losses with only the remaining sleeve portion in the inner polepiece. Small prior art air gaps at interfaces 42,44 between the polepieces and the housing are eliminated to minimize reluctance of the magnetic circuit. A significant increase in actuating force is realized in comparison with a prior art solenoid actuator.
A solenoid for providing linear actuation, comprising:
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.
An internal combustion engine, comprising
Dependencies are inferred from the claim text.