| 摘要 |
A rotary damper includes a cylindrical rotor for receiving a torque input, a housing having a shaft disposed within the cylindrical rotor and a cylindrical wall surrounding the shaft, a viscous fluid interposed between the cylindrical rotor and the housing shaft, a coil spring provided between the inner periphery of the cylindrical wall and the outer periphery of the cylindrical rotor and having one end secured to the housing and the other end secured to the cylindrical rotor, a cover secured to an open end of the cylindrical wall and having an inner surface facing the end surface of the cylindrical rotor, an excursion groove formed within the inner surface of the cover or within an end surface of the cylindrical rotor and having an end portion defined as a heart-like cam groove, and an operating pin provided upon the cover or upon the cylindrical rotor and capable of excursion along the excursion groove. The coil spring is wound as a result of rotation caused by means of the torque input received by means of the cylindrical rotor.
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