markjs Posted July 16, 2005 Share Posted July 16, 2005 Why do manual transmission cars "whine" when you run them in reverse gear? Link to comment Share on other sites More sharing options...
Humble Nuto 53 Posted July 16, 2005 Share Posted July 16, 2005 forward gears are all "helical" slanted and curved....strong teethies reverse gears are all straight cut, cheaper but noisy... (straight cut gears are something like 8% more efficient than helical) (one reason yamaha motorcycles always had a distinctive whine) Link to comment Share on other sites More sharing options...
NorthWet Posted July 16, 2005 Share Posted July 16, 2005 forward gears are all "helical" slanted and curved....strong teethies reverse gears are all straight cut, cheaper but noisy... (straight cut gears are something like 8% more efficient than helical) (one reason yamaha motorcycles always had a distinctive whine) Helical gears are actually much weaker than straight cut, as the contact surface is really a patch that moves from one side of the gear to the other as the two gears mesh. But because of this gradual, moving contact point they are quieter. Straight cut gears have contact along the entire length of the tooth all at once, providing a stronger mesh. But because the entire length makes contact at once it crates noise vibration from the contact. Link to comment Share on other sites More sharing options...
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