| 摘要 |
<p>A sprocket wheel device with adjustable equivalent diameter, a stepless speed changing device using the sprocket wheel device and a power system including the stepless speed changing device are disclosed. The sprocket wheel device(10) comprises a base plate(1). At least three small sprocket wheels (4') are provided on the base plate, and these small sprocket wheels are all provided with gears. furthermore, these small sprocket wheels move on the base plate in such a manner that the diameter of the excircle of their pitch circles is changed. The sprocket wheel device adjusts the speed changing characteristic of a power and movement transmission mechanism. Therefore, skidding can be prevented, abrasion can be reduced and transmission efficiency can be improved.</p> |
