| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotary damper wherein excessive force caused by expansion of viscous liquid is prevented from acting on a casing and the like, and braking characteristics are prevented from being changed by change in the viscosity of the viscous liquid. SOLUTION: The rotary chamber includes an operation chamber 3 wherein viscous liquid is filled, a first chamber 7 which is in communication with the operation chamber 3, and is capable of accommodating increase in volume by expansion of the liquid, a second chamber 8 which is provided adjacent to the first chamber 7 with a movable member 9 provided in between, and allows outside-air to flow through, a spring member 10 provided in the second chamber 8 in order to move the movable member 9 in response to the volume of the viscous liquid held in the first chamber 7, a flow path 11 for causing a resistance in the viscous liquid when the viscous liquid passes through by being pushed by vanes 5, and a throttling part 9a. The throttling part 9a is provided in the flow path 11 so as to narrow the flow path 11 in the case when the volume of the first chamber 7 is expanded in accordance with movement of the movable member 9, while in the case when the volume is reduced, the throttling part 9a expands the flow path 11. COPYRIGHT: (C)2008,JPO&INPIT
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