Optimal Gear Teeth & Radius for Low Friction & Weight

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The optimal number of teeth for spur gears is generally at least 20, with a maximum of around 30 to ensure strength. The relationship between teeth count and gear radius is crucial for minimizing friction and weight effects, as larger teeth contribute to lower friction due to rolling rather than sliding. While specific applications depend on materials and lubrication, industry standards often guide gear design. A standard reference for gear types and their applications can be found in various engineering resources. Understanding these factors is essential for effective gear design and performance.
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Hi all, i have a doubt. How much teeth in relationship to his radius need to have a gear to be optimal? And, if i have 2 gears with same radius and same #of teeth, to have low friction and low negative effect from weight how much teeth they need to have and with which radius?

I know it's too generic question, it depends from material of the gear, lubrification type and shape of teeth. But is there a standard table used in industries with gear types and optimal applications?
 
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There is no simple answer, but for spur gears you will need at least 20 teeth. The teeth should be as big as possible so they are strong. That sets a maximum number of teeth at about 30.
Spur gear teeth roll against each other, they do not slide, so there is low friction.
 
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