Patent ID: 7554429
Filing Date: 2009-06-30
Classification: F16F,H01F

Abstract:
1. An electromagnetic actuator comprising: a coil assembly having a coil of a cylindrically wound conducting wire; a movable core arranged movably in an axial direction of the coil assembly in a sealed space defined within the coil assembly; a fixed core opposed to an axial one end face of the movable core; and a sealing member sandwiched between an inner side face of a flange extending radially outward of the fixed core and an axial one end face of the coil assembly opposed to the inner side face of the flange to seal the sealed space, wherein both of the inner side face of the flange and the axial one end face of the coil assembly are formed as flat faces, wherein the sealing member comprises: an inner ring portion and an outer ring portion which are arranged at a distance therebetween and respectively inside and outside in the radial direction, the inner and the outer ring portions being clamped between the flange of the fixed core and the axial one end face of the coil assembly in a compressed state, respectively; and a thin connection portion integrally connecting the inner and the outer ring portions, wherein the inner and the outer ring portions are each formed to have a cross-sectional shape projecting outside of opposite faces of said thin connection portion in said axial direction in both of a free state and said compressed state of the respective ring portions.