Actuator
AssigneeMicrohydraulics, Inc.
InventorGeorge Kadlicko
Life of this patent
Estimating the term…
Abstract
An electromagnetic actuator has an armature assembly including a pair of spaced plate springs to locate the magnetic core radially. The springs are formed from concentric rings interconnected by radial bridges so that flexure of the spring does not cause radial displacement. A single coil or double coil may be used and each coil is supported on a pair of bobbins. One bobbin overlies the core and the other has a recess to receive part of the core to maintain a uniform air gap between the core and bobbin.
Claims24
An electromagnetic actuator comprising a body, an armature movable within said body for reciprocation along a longitudinal axis, a pair of supports extending from said body to said armature at longitudinally spaced locations to support said armature and a coil assembly located in said body and encompassing said armature, each of said supports including a resilient plate member extending normal to said longitudinal axis and secured to said body, said plate member flexing in a direction of said longitudinal axis upon application of an electromagnetic force between said coil assembly and said armature, wherein said plate members include a plurality of concentric rings interconnected to one another by a plurality of radial bridges for inhibiting relative torsional displacement of said armature with respect to said body.
An electromagnetic actuator comprising a body, an armature moveable within said body for reciprocation along a longitudinal axis, a pair of supports extending from said body to said armature at longitudinally spaced locations to support said armature and a coil assembly located in said body and encompassing said armature, each of said supports including a resilient member extending normal to said longitudinal axis and secured to said body, said resilient member flexing in a direction of said longitudinal axis upon application of an electromagnetic force between said coil and said armature, thereby providing a bias to said armature, said armature including a magnetizable core mounted on a tube extending between said members and secured thereto by pins passing through said members and into said tube, wherein said pins expanding said tube radially for securing said core to said tube.
An electromagnetic actuator comprising a body, an armature moveable within said body for reciprocation along a longitudinal axis, a pair of supports extending from said body to said armature at longitudinally spaced locations to support said armature and a coil assembly located in said body and encompassing said armature, each of said supports including a resilient member for locating said armature radially with respect to said body, said resilient member extending normal to said longitudinal axis and secured to said body, said member flexing in a direction of said longitudinal axis upon application of an electromagnetic force between said coil and said armature thereby providing a bias to said armature, said coil assembly including a coil and a pair of bobbins located at opposite ends of said coil, said bobbins extending between said coil and said body to locate said coil axially and having an axially extending shoulder to support said coil radially, wherein said resilient member and said axially extending shoulder facilitate a radially fixed spatial relationship between said armature and said coil assembly.
Dependencies are inferred from the claim text.