题目内容
现在很多高档汽车都应用无极变速,无极变速可以在变速范围内任意连续地变换速度,性能优于传统的档位变速器。如图所示是截锥式无极变速模型示意图,两个锥轮之间有一个滚动轮,主动轮、滚动轮、从动轮之间靠着彼此之间的摩擦力带动(不打滑)。当位于主动轮和从动轮之间的滚动轮从左向右移动时,从动轮转速减小,当滚动轮位于主动轮直径D1、从动轮直径D2的位置时,主动轮转速n1、从动轮转速n2的关系是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250019560673288.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250019560673288.jpg)
A.![]() | B.![]() | C.![]() | D.![]() |
C
试题分析:主动轮、滚动轮、从动轮之间是没有打滑的摩擦传动,故它们的轮缘上的线速度大小相等,即
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001956161415.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001956192470.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001956208563.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001956223548.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001956239602.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001956332698.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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