| 摘要 |
<p>PROBLEM TO BE SOLVED: To protect an electric motor equipped as a driving source of an unmanned helicopter from adhesion of liquids and dusts and effectively radiate heat generated by driving so as to maintain the output of the electric motor.SOLUTION: A housing 66c of an electric motor 66 connected with a main mast 61 through a gear is enclosed by a motor cover 67, and hole parts 67a respectively formed on left and right side surfaces of the motor cover 67 are covered by an air duct 68 in which a blower is installed and an exhaust port 68b is provided at a lower end part. Air in the motor cover 67, which is suctioned by the blower, is exhausted from an opening 68b of the air duct 68 to the exterior of the motor cover 67.</p> |
