Gear-Tooth Action
Gears of all types have the common objective of transmitting theoretically smooth motion through the engagement of successive teeth. Certain design parameters need to be maintained to ensure that this occurs, such that one or more pairs of teeth are engaged before a preceding pair disengages.

Standard Tooth Forms
The involute tooth form is almost universally used for spur and helical gears. In principle it is applied to bevel gears and to some wormgears. The involute form can provide accurate transmission of motion, even when there is some slight change in center distance between shafts.

It also offers a number of manufacturing advantages. In some worm and other noninvolute gearing, conjugate forms and accurate manufacturing processes must be employed to ensure smooth transmission.

Modified and Special Tooth Forms
Common modifications to involute gear geometry include tip and root relief, crowning, and profile shift.These are applied to optimize gears for a given application.

See AGMA 913-A98, Method for Specifying the Geometry of Spur and Helical Gears for additional design information. Some noninvolute tooth forms are used to achieve higher capacity.

Normally, very accurate manufacturing and mounting must be maintained to realize this advantage.

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1 comment:

Unknown said...

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