Patent ID: 7348694
Filing Date: 2008-03-25
Classification: F16F

Abstract:
1. An electromagnetic actuator comprising: a stationary core supported on a bottom wall of a housing made of a magnetic material; a movable core opposed to the stationary core with an air gap left therebetween to drive a movable member; a coil assembly constructed by winding a coil around a bobbin which is supported in the housing and surrounds the stationary and movable cores; and a tubular bearing member which is disposed inside the coil assembly and slidably supports the movable core, wherein a first yoke for retaining the coil assembly by cooperating with the bottom wall is connected to the housing; the bearing member is fitted into the first yoke; a support for supporting an outward-facing flange formed at one end of the bearing member is mounted on the bottom wall; a set spring for biasing the outward-facing flange toward the support is mounted under compression between the outward-facing flange and the first yoke; and a low-friction material coating made of a fluorocarbon resin is formed on at least one of opposed sliding surfaces of the bearing member and the movable core.