Patent ID: 6281772
Filing Date: 2001-08-28
Classification: H01F

Abstract:
A rectilinear motion solenoid, comprising:a housing;an annular coil of electrical wire mounted in said housing and having a central hole therethrough;a first magnetic pole piece oriented adjacent a first axial end face of said annular coil and a second magnetic pole piece oriented adjacent a second end face of said annular coil, said first and said second pole pieces being coupled together by a third magnetic piece;a first hole through said first pole piece coaxial with said central hole;a second hole through said second pole piece coaxial with said central hole;an armature of magnetic material rectilinearly movably displaceably mounted in said central hole with sufficient radial clearance therebetween and having non-magnetic rod parts projecting coaxially from axially facing ends thereof, a first one of said non-magnetic rod parts being coaxially received in said first hole with sufficient radial clearance therebetween, an end of said armature remote from said first rod part being coaxially received in said central hole with sufficient radial clearance therebetween and to define a non-working air gap;first and second substantially linear spring for securing respective said first and second rod parts to said housing to effect a frictionless resilient suspension of said armature in said central hole and to orient an annular axial end face of said armature adjacent said first rod part in opposing relation to said first pole piece to define a working air gap therebetween;a closed chamber filled with a liquid, said second rod part operatively coupled to a member oriented in said chamber, a disk mounted on said member for movement therewith, a perimeter of said disk being oriented in close relation to an interior wall surface of said chamber to define a liquid flow restricting gap therebetween and effecting during operation a dynamic dampening of armature movement.