Patent ID: 9404550
Filing Date: 2016-08-02
CPC Classification: F16F

Claim Text:
1. A rotary damper comprising: a shaft having a hollow portion and capable of rotating about a central axis; a pair of side panels that support the shaft rotatably; a case provided between the pair of side panels such that an operating chamber is defined in an interior thereof; a vane provided on the shaft such that a tip end thereof slides against an inner periphery of the case and divides the operating chamber into a first chamber and a second chamber; and a damping valve provided in the shaft to apply resistance to a flow of a fluid traveling between the first chamber and the second chamber, the damping valve including a partition wall member inserted into the hollow portion to define, within the hollow portion, a first side valve chamber that communicates with the first chamber and a second side valve chamber that communicates with the second chamber; a sliding partition wall that is inserted into the hollow portion to be free to slide and defines a gas chamber and a liquid chamber within the hollow portion; a rod that penetrates the partition wall member; a partitioning member provided on a base end of the rod and inserted into the hollow portion so as to partition the liquid chamber from the first side valve chamber; a holder member that holds the rod and closes the second side valve chamber; and an outer peripheral screw nut that is screwed to an inner periphery of the hollow portion so as to fix the holder member to the hollow portion, wherein: a step portion is provided on the inner periphery of the hollow portion, the holder member includes an annular portion attached to an outer periphery of the rod, and a fitting portion provided on an outer periphery of the annular portion and fitted to the hollow portion, and the outer peripheral screw nut and the step portion sandwich the fitting portion of the holder member such that the fitting portion is fixed to the hollow portion.