sudeepd

Why does Reverse hav Spur Gear & not Helical Gear?

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Manual transmissions use mostly helical gears, but reverse is a special situation that requires a different type of gear - a spur gear.

Why is the Reverse Gear given with Spur Gear unlike other Gears which use Helical?

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spur gears - gears are cut straight or have straight teeth. very basic gears. most commonly found. easy to manufacture and less costly. All bajaj scooters had spur gears. (know that for sure since I worked for 1 year at bajaj akurdi plant as part of curriculum)

Helical gears are cut at an angle - immediate advantage helical gears provide is more contact surface for same thickness of forged gear blank as against the spur gear. heavy load applications, high speed engines typically use them. Also provide smoother transmission. difficult to manufacture and costly.

Since reverse gear very has less usage compared to forward gears it makes sense to use spur gear for reverse and reduce cost.

this link will also be useful - http://science.howstuffworks.com/gear2.htm

 

Also see this link on how manual transmission work. it shows use of spur gear for reverse aswell - http://auto.howstuffworks.com/transmission3.htm
The VTEC guy2009-08-05 22:37:58

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