Patent ID: 9315127
Filing Date: 2016-04-19
CPC Classification: B60N,F16F

Claim Text:
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 a flow of the viscous fluid in a rotating direction about an axis of said vessel, said rotating direction having a clockwise rotating direction and a counterclockwise rotating direction opposite to the clockwise rotating direction; a partitioning member for partitioning the interior of said vessel accommodating the viscous fluid into at least first and second chambers in the rotating direction, said partitioning member being provided in the interior of said vessel rotatably in the rotating direction with respect to said vessel; at least one communicating hole formed in said partitioning member so as to allow the first and second 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 from the first chamber into the second chamber through said communicating hole when an internal pressure of the viscous fluid accommodated in the first chamber has exceeded a fixed value on a basis of a rotation of said partitioning member in the clockwise rotating direction with respect to said vessel, wherein said flow limiting means includes: a variable passage forming member which is movably fitted to said partitioning member and has, in a first end face of the variable passage forming member in the rotating direction facing a side face in the rotating direction of said partitioning member, a communicating groove which is open at a first end portion of the communicating groove to said first chamber and is open at a second end portion of the communicating groove to said communicating hole; and an annular elastic member which is located between the first end portion and the second end portion of the communicating groove in a radial direction and fitted to the side face in the rotating direction of said partitioning member, such that the variable passage for effecting mutual communication between the first and second chambers in said vessel by means of said communicating hole by allowing said first chamber and said communicating hole to communicate is formed by the annular elastic member and the first end face in the rotating direction of said variable passage forming member having the communicating groove, so as to brake the relative rotation in the rotating direction of said partitioning member with respect to said vessel.