| 摘要 |
PROBLEM TO BE SOLVED: To obtain powerful damping effect by the action of high torque at the beginning and end of rotation while preventing the dull motion of a cover and a door by the action of low torque during the time between the beginning and end of rotation. SOLUTION: An angle from an axis L obtained by converting the circumferential thickness width of a protruding part 41 is madeθ0 by first and second flow resistance control means 30, 40 for controlling the flow resistance of a viscous fluid 12. Further in the state of a protrusion 36 of a movable valve being in close contact with the protruding part 41 through a cover 35, an angle formed by the circumferential thickness centerline of the protruding part 41 and that of the protrusion 36 is madeθ1, and the floating angle of the protrusion 36 to the cover 35 is madeθ2. In the case of the separating angle of a recessed part 42 from the protrusion 36 beingθS, an expression :θS>θ1+θ2-θ0/2 is materialized.
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