| 摘要 |
PROBLEM TO BE SOLVED: To provide an electromagnetic damper for generating sufficient damping force even when expansion speed is high. SOLUTION: This electromagnetic damper is provided with a screw nut 4 provided in a second cylinder 5 that is slidably inserted into a first cylinder 2, a screw shaft 3 rotatably engaged with the screw nut 4, and rotatably connected to the first cylinder 2, and a motor 1, so that damping force is generated by electromagnetic force. A cylinder 20 to be connected to the second cylinder 5 is provided outward of the first cylinder 2, and a circular piston 21 is provided around the first cylinder 2 to part the inside of the cylinder 20 into an upper changer R1 and a lower chamber R2 in which operating fluid O is filled. In the middle of a passage 30 connecting the upper chamber R1 with the lower chamber R2, a damping valve 31 is provided, so that reduction of damping force generated by electromagnetic force when expansion speed becomes higher is compensated by damping force generated by pressure loss of operating fluid O passing the damping valve. COPYRIGHT: (C)2005,JPO&NCIPI
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