| 主权项 |
1. A damper comprising:
a vessel for accommodating a viscous fluid in its interior; at least one hampering wall provided in the interior of said vessel to hamper the flow of the viscous fluid in a direction about an axis of said vessel; a partitioning member for partitioning the interior of said vessel accommodating the viscous fluid whose flow has been hampered by said hampering wall into at least two chambers in the direction about the axis, said partitioning member being provided in the interior of said vessel rotatably in the direction about the axis with respect to said vessel; at least one communicating hole formed in said partitioning member so as to allow the two chambers in the interior of said vessel to communicate with each other via a variable passage whose passage cross-sectional area changes; and flow limiting means for limiting the flow of the viscous fluid in the chamber on one direction side in the direction about the axis into the chamber on another direction side in the direction about the axis through said communicating hole when the internal pressure of the viscous fluid accommodated in the chamber on the one direction side in the direction about the axis has exceeded a fixed value on the basis of the rotation of said partitioning member in the one direction in the direction about the axis with respect to said vessel, wherein said flow limiting means includes: a variable passage forming member which has a through hole which, in an end face in the one direction in the direction about the axis of said variable passage forming member, is open to the chamber on the one direction side in the direction about the axis, said variable passage forming member being fitted to said partitioning member movably in such a manner as to oppose, at an end face in another direction in the direction about the axis of said variable passage forming member, a side face in the one direction in the direction about the axis of said partitioning member, so as to form the variable passage communicating with, on one side, the through hole and, on another side, said communicating hole in cooperation with the side face in the one direction in the direction about the axis of said partitioning member; and an annular elastic member surrounding the variable passage and disposed between the end face in the other direction in the direction about the axis of the said variable passage forming member and the side face in the one direction in the direction about the axis of said partitioning member, so as to brake the relative rotation in the direction about the axis of said partitioning member with respect to said vessel. |
