| 摘要 |
<p>[Problem] To provide a rotational damper having excellent response and exhibiting a damping effect only in one direction, and a vehicle seat provided with the rotational damper. [Solution] A rotational damper 10 comprising: a casing 13 provided therein with a partition wall portion 12 provided with a flow path 11; a rotation body 16 rotatably disposed within the casing and provided with a pair of rotary vanes 14, 15 for partitioning the inside of the casing into two chambers R1, R2, in corporation with the casing; a viscous fluid L contained within the casing; lip seals 17 mounted to the pair of rotary vanes in such a manner that, only when the rotation body rotates and moves in one direction, the lip seals 17 expand in the direction perpendicular to the vertical direction to prevent the viscous fluid from flowing between the two chambers; and a lid body 18 for closing the opening of the casing.</p> |
