Patent ID: 8418998
Filing Date: 2013-04-16
Classification: B60N,F16F

Abstract:
1. A damper comprising: a vessel; a partitioning member which partitions an interior of said vessel into first and second accommodation chambers for accommodating a viscous fluid, and which rotates together with said vessel about an axis of said vessel and is movable in an axial direction of said vessel; moving force imparting means for imparting to said partitioning member a moving force in one axial direction by an input of relative rotation about the axis of said vessel with respect to said vessel, so that a moving velocity of said partitioning member to which the moving force is imparted is set to one corresponding to a rotating velocity of the input of relative rotation; first resilient means for resiliently urging said partitioning member in another axial direction; a through hole formed in said partitioning member so as to allow the first and second accommodation chambers inside said vessel to communicate with each other; and an allowing/limiting member which is resiliently urged in the one axial direction to allow the viscous fluid accommodated in said first and second accommodation chambers in said vessel to flow reciprocally between said first and second accommodation chambers through said through hole, and which limits the flow of the viscous fluid in said first accommodation chamber in the one axial direction into said second accommodation chamber in the other axial direction through said through hole against the resilient urge in the one axial direction allowing that flow, when the internal pressure of the viscous fluid accommodated in said first accommodation chamber in the one axial direction is generated in excess of a fixed value on a basis of the movement of said partitioning member in the one axial direction, said first accommodating chamber being defined by a first end face of said partitioning member on the one direction side in the axial direction, said second accommodating chamber being defined by a second end face of said partitioning member on the another direction side in the axial direction, said through hole having an axial one open end opening at the first end face and an axial another open end opening at the second end face, said allowing/limiting member including a lid portion which is disposed in the first accommodating chamber movably in the axial direction and which has a third end face on the another direction side in the axial direction, said third end face opposing said first end face of said partitioning member, said lid portion being resiliently urged in the one axial direction, said first and third end surfaces defining a variable gap for communicating said first accommodating chamber with said through hole therebetween.