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    • 20. 发明公开
    • ROTATIONAL DAMPER
    • EP4108954A1
    • 2022-12-28
    • EP20919729.2
    • 2020-02-17
    • TOK, Inc.
    • AKIBA, Junichiro
    • F16F9/12
    • A rotary damper that does not cause a problem that a rotational resistance fluctuates during a rotation of a rotor is provided. On a bottom surface 2b of a housing 2, a plurality of walls 2d are erected concentrically centered on a bearing portion 2c. Notches 2e are formed in the walls 2d0, 2d1, 2d2, and 2d3 at point-symmetrical peripheral positions centered on the bearing portion 2c, and each notch 2e is distributed and arranged at peripheral positions that evenly divide a circumference centered on the bearing portion 2c between the adjacent walls 2d. On a side surface 4b of a rotor 4, a plurality of walls 4d are erected concentrically centered on a center pin 4c at a pitch deviated from a standing pitch of the walls 2d of the housing 2 by a half pitch. Notches 4e are formed in the walls 4d0, 4d1, and 4d2 at point-symmetrical peripheral positions centered on the center pin 4c, and each notch 4e is distributed and arranged at peripheral positions that evenly divide a circumference centered on the center pin 4c between the adjacent walls 4d.