| 摘要 |
PURPOSE:To dissolve a bad influence on a motor based on a rotation of a fan resulting from ram pressure by connecting the front edge of a shaft of a motor with the surfaces of a fan boss confronting with each other through gearing cogs which are disengaged automatically when the higher ram pressure than a fixed level is applied. CONSTITUTION:A boss holder 10 is secured on a threaded portion 5 of the edge of a shaft 2 of a motor 1 with a nut 6 and a fan boss 9 is fitted loosely on the shaft 2 rotatably. Gearing cogs 11 and 12 are provided on the surfaces of the boss holder 10 and the fan boss 9 confronting with each other, a spring is applied to the fan boss in the direction of the boss holder 10 by a spring 8a supported by a stopper 7 and those boss holder and boss are gearing with each other normally. When a travelling speed of a motor car is increased, ram pressure to be applied to fan is increased until it exceedes a pressure of the spring 8a the gearing cogs 11 and 12 are disengaged automatically and a load to be applied to the motor is released. |
