Patent ID: 6538543
Filing Date: 2003-03-25
Classification: F02M,F16K,H01F

Abstract:
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 rigid 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 rigid bearing-containing polepiece is provided with ventilative means for permitting the draining and evaporation of fluid from within said solenoid.