The following notes are taken from Wind Turbine Technology by Ahmad Hemami.
- Gears are used to change the speed and torque between two shafts
- driving shaft is the input
- driven shaft is the output
- usually used as speed reducers, torque on output shaft larger than input torque
- In wind turbines gears increase the speed of rotor to match higher speed of electric generators
- Configurations for a pair of gears
- Spur Gears the shaft are parallel
- bevel gears shafts are perpendicular
- worm gears shafts are perpendicular
- Gears can be categorized based on the angle of the teeth with the body of the gears
- helical gears have teeth cut an angle
- Backlash is the free play between a pair of gears
- optimally want to minimize
- Planetary Gears
- sets of gears with a particular arrangement
- Sun Gear
- Ring Gear
- often stationary and doesn't rotate
- Planet Gear
- Arm
- Gears can be combined in a gearbox, planetary gear combined with other gears
- Lubrication is vital reduces friction, cooling, moves dirt and debris away
- Alignment is also crucial
- Damage leads to permanent failure
- types of damage are fracture, bending, wear, fatigue, cracks, and scuffing
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