thumb|Freewheel mechanism thumb|right|Ratchet (device)|Ratcheting freewheel mechanism (van Anden, 1869)
thumb|Freewheel mechanism thumb|right|Ratchet (device)|Ratcheting freewheel mechanism (van Anden, 1869)
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.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).