Freewheel

（重定向自Free wheel）

Ratcheting freewheel mechanism (van Anden, 1869)

In mechanical or automotive engineering, a freewheel or overrunning clutch is a device in a transmission that disengages the driveshaft from the driven shaft when the driven shaft rotates faster than the driveshaft. An overdrive is sometimes mistakenly called a freewheel, but is otherwise unrelated.

单词	Free wheel
释义	Free wheel 原声例句十字小溪（下） Between us we freed the wheel enough so that I could drive the car. 在我们之间，我们充分释放了车轮，这样我就可以开车了。英语百科 Freewheel （重定向自Free wheel） In mechanical or automotive engineering, a freewheel or overrunning clutch is a device in a transmission that disengages the driveshaft from the driven shaft when the driven shaft rotates faster than the driveshaft. An overdrive is sometimes mistakenly called a freewheel, but is otherwise unrelated.
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