Efficiency of Small Machine Elements

Typical efficiencies of well lubricated small machine elements:

• ordinary bearings : 95 - 98%
• roller bearings : 98%
• ball bearings : 99%
• spur gears with cut teeth including bearings : 99%
• bevel gears with cut teeth including bearings : 98%
• belts : 96 - 98%
• high-class silent power transmission chain : 97 - 99%
• roller chains : 95 - 97%
• bicycle derailer : 87 - 97%
• bicycle gear hub : 86 - 95%

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