- November 21, 2017
- Posted by: maxpower
- Category: Gear Motors
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%.