Patent ID: 6098765
Filing Date: 2000-08-08
Classification: B60G,F16F

Abstract:
A rotary damper, comprising:a pressure generating mechanism portion including a casing, a stationary vane fixed on an inner peripheral surf ace of the casing, and a pivotably installed swingable vane, at least one pair of pressure chambers being defined and formed between the stationary vane and the pivotably installed swingable vane so that when a volume of one of the pressure chambers is increased due to a pivotal movement of the swingable vane, the volume of the other pressure chamber is decreased, and within which a fluid is filled;a damping force generating mechanism portion including damping force generating means, interposed in a midway through a flow passage in which the fluid is filled, for restricting a fluid circulation in at least one direction of the flow passage so as to develop a damping force;a first transmission mechanism portion, interposed between one of the pressure chambers in the pressure generating mechanism portion and one end of the flow passage in the damping force generating mechanism portion, for transmitting a movement of the fluid and a pressure of the fluid via a movable partitioning wall; anda second transmission mechanism portion, interposed between one of the pressure chambers in the pressure generating mechanism portion and the other end of the flow passage in the damping force generating mechanism portion, for transmitting the movement of the fluid and the pressure of the fluid via the movable partitioning wall, and wherein the fluid having a viscosity at least higher than that of the fluid filled in the flow passage located in the damping force generating mechanism portion is used as the fluid filled within both of the pressure chambers in the pressure generating mechanism portion.