| 摘要 |
PROBLEM TO BE SOLVED: To provide a dynamic damper, a dynamic damper unit provided with the dynamic damper and a method for manufacturing the dynamic damper reducing generation of a shutting up sound regardless of magnitude of vibration generated on a door. SOLUTION: The active dynamic dampers (ACD) 101 are mounted to respective doors 81-83 of an automobile. In the ACD 101, a movable element can be reciprocated in an axial direction of a stator by changing a direction of a current flowing in a coil. Thereby, since the movable element is operated according to the vibration generated on the respective doors 81-83, the vibration generated on the respective doors 81-83 is correctly vibration-proofed. Accordingly, since air in a space 90 between an inner plate 84 and an outer plate 85 of the respective doors 81-83 is restrained from being oscillated, and as a result, air in a cabin is also restrained from being oscillated, generation of the shutting up sound is reduced. COPYRIGHT: (C)2007,JPO&INPIT
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