| 摘要 |
PURPOSE:To enable to freely change the speed change point to shift to high speed gear in accordance with running conditions by a structure wherein a spring to cope with the centrifugal force of the weight of the automatic centrifugal clutch is provided and the resilient force of the spring is turned to be able to change. CONSTITUTION:During climbing hill, at rapid acceleration or the like, it is preferable to use a low speed gear under high torque while an engine is allowed to run up to considerable higher speed range. In this case, an operating wire 182 is pulled so as to compress a spring 16. through a spring retainer 162 by pivoting an operating lever 18 about a fulcrum 181. The compressed resilient force is transmitted through an arm 17 to a weight adjusting bearing 77 in order to cope with the centrifugal force of the weight 75, resulting in making the engagement of the automatic centrifugal clutch 7 impossible unless the centrifugal force of the weight 75 is increased by the increase of rotation of a second shaft 8. |
