| 摘要 |
A rotary damper (D) is constituted by: housings ( 11, 51 ); a silicon oil ( 21 ) being housed inside the housings ( 11, 51 ); a rotor ( 31 ) wherein a resistive portion ( 36 ) moving through the silicon oil 21 inside the housings ( 11, 51 ) is provided in an axial portion ( 32 ) which is housed inside the housings ( 11, 51 ) and projects from the housings ( 11, 51 ); and an O-ring ( 61 ) preventing the silicon oil ( 21 ) from leaking between the axial portion ( 32 ) and the housing ( 51 ), and multiple arc-like through-bores ( 37 ) are provided in the resistive portion ( 36 ) on a concentric circle, and depressed grooves ( 38 ) communicating with the arc-like through-bores ( 37 ) are provided. Accordingly, during the assembly, the air being mixed into the housing is not allowed to be excessively compressed, so that even if the rotor rotates bi-directionally, the noise being caused by the air being mixed into the housing can be prevented.
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