Know Which gear is more efficient?

Comparing efficiencies of different gear types across various reduction ratios will help us to make right gearbox selection for our applications. Please note that these efficiency values are for general guideline and refer manufacturers catalog for more accurate values.

Gear Efficiency Comparison Table

No Type Normal Ratio Range  Efficiency Range
1 Spur 1:1 to 6:1 94-98%
2 Straight Bevel 3:2 to 5:1 93-97%
3 Spiral Bevel 3:2 to 4:1 95-99%
4 Worm 5:1 to 75:1 90-50%
5 Hypoid 10:1 to 200:1 80-95%
6 Helical 3:2 to 10:1 94-98%
7 Cycloid 10:1 to 100:1 75% to 85%

 Spur Gear Efficiency

Spur gearing is a parallel shaft arrangement, and these gears can achieve much higher efficiencies compared to other gears types. Its efficiency varies from 94% to 98% with lower gears ratios.

Straight Bevel Gear Efficiency

Straight bevel gearing is similar to spur gearing with perpendicular shaft arrangement. Like spur gearing these gears also only can handle lower gears ratios with higher efficiencies (93% to 97%).

Spiral Bevel Gear Efficiency

Because of tooth shape and contact spiral bevel having less noise and vibrations compared to straight bevel gears, and thus having better efficiency (95% to 99%).

Worm Gear Efficiency

Worm gears efficiency varies significantly when lead angle, friction factor and gears ratio changes. In higher ratios efficiency of worm gears, drops.

Hypoid Gear Efficiency


The efficiency of a hypoid gears is around 80-95% and can achieve very high gears ratios up to 200:1.

Helical Gear Efficiency

Helical gears can run with very high pitch line velocity and can achieve much higher efficiencies (94%-98%) with maximum gears ratios up to 10:1.

Cycloid Gear Efficiency

These gears can work in very high efficiencies at relatively high gears ratios above 30:1 and under normal working conditions cycloid gearing efficiency ranges from 75% to 85%.

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