MAGNETIC DAMPER

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PROBLEM TO BE SOLVED : To reduce the size of a magnetic damper used for a seat suspension or the like for an automobile. SOLUTION : A cylinder 10 is composed of a tubular conducting body 11 and a yoke 12 covering an outer peripheral surface thereof. Further, between adjacent permanent magnets 11 constituting a piston 20, preferably, a yoke 22 is provided at an outer side end of the permanent magnet 21 positioned at the axial end, as the configuration. Accordingly, the magnetic flux of the permanent magnet 21 is mostly converged to the yoke 22 between the permanent magnets 21, and the converged large portion of the magnetic flux penetrates the conducting body 11 constituting the cylinder 10. The large portion of the magnetic flux penetrates the conducting body 11, and as the outer peripheral surface of the cylinder 10 is covered with the yoke 12, a magnetic circuit of converged magnetic flux type is formed such that very reduced magnetic flux passes the outside of the cylinder 10. Accordingly, high damping force can be obtained without increasing rare-earth magnets or without upsizing the cylinder and the piston. COPYRIGHT : (C)2012, JPO&INPIT