Freewheel

（重定向自Overrunning clutch）

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	Overrunning clutch
释义	Overrunning clutch 英语百科 Freewheel （重定向自Overrunning clutch） 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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