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Reverse gear whine has me curious...

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Old 05-27-2008, 10:33 AM   #1
TacoinSC [OP] TacoinSC is offline
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Reverse gear whine has me curious...

Being this is my first Toyota, I've noticed a distinct whine when using reverse. Makes a "wind-up" kind of noise. Come to think of it, I've noticed this on a lot of Toyotas, old and new, which leads me to believe it's completely normal.

I'm not concerned by it, just curious: what causes it? Is it the way the gears are cut?
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Old 05-27-2008, 01:22 PM   #2
TacoinSC [OP] TacoinSC is offline
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Never mind. Found the answer:


"The teeth on gears of mass market automobiles are not straight-cut, but are helically cut, in order to reduce gear whine. Reverse gear often is straight-cut, however, leading to a characteristic whine from many cars when reversing."

Excerpt taken from:
http://www.spiritus-temporis.com/man...internals.html
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Old 05-27-2008, 05:41 PM   #3
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Good job! Its correct. Most all vehicles will whine in reverse.
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Old 05-27-2008, 06:52 PM   #4
TacoinSC [OP] TacoinSC is offline
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The Tremec T-56 in my GTO has constant mesh synchronized reverse, I guess that's why you can't hear it. Why do you think Toyota (actually Aisin) uses straight cut gears for reverse? Cost savings?
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Old 05-27-2008, 07:00 PM   #5
With sufficient thrust, pigs fly just fine.
chris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shedchris4x4 is one of the sharper tools in the shed
 
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Quote:
Originally Posted by TacoinSC View Post
The Tremec T-56 in my GTO has constant mesh synchronized reverse, I guess that's why you can't hear it. Why do you think Toyota (actually Aisin) uses straight cut gears for reverse? Cost savings?
More than likely. Other manufacturers use a straight cut gear for revers as it is narrower than the other gears, and allows them to save a little space and weight.
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