| 摘要 |
PURPOSE:To obtain sufficient sound shielding effect by surrounding the outer peripheral surfaces of a motor body and a gear body with a felt to engage a geared motor in a casing, thereby eliminating the necessity of accurately position the motor in the casing. CONSTITUTION:An arm 4 which varies the inclining angle of a blade 6 is mounted on an output shaft 3 projected above the upper surface of a gear box 2 of a geared motor. The outer peripheral surfaces of a motor body 1 and the gear box 2 are coated with a wool felt 10, and engaged within a casing 20. Thus, the motor can be stably secured. Since the displacement of the relative position between the motor and the casing 20 is absorbed by the felt 10, it is not necessary to accurately position the motor in the casing 20. Further, the sound of the special frequency band based on the operating sound of the motor is remarkably reduced. |
