WGear
WAmerican Gear Manufacturers Association
WBacklash (engineering)
WBevel gear
WCrown gear
WCycloid gear
WCycloidal drive
WDifferential (mechanical device)
WDuplex worm
WEpicyclic gearing
WGear bearing
WGear oil
WGear shaping
WGear train
WGeneva drive
WHelix angle
WHerringbone gear
WHobbing
WInvolute gear
WLayshaft
WLead (engineering)
WMagnetic gear
WNon-circular gear
WNon-synchronous transmission
WPinion
WPressure angle
WGear
WProfile angle
WRack and pinion
WRavigneaux planetary gearset
WGear
WSpiral bevel gear
WSprocket
WSpur gear
WStarter ring gear
WStrain wave gearing
WSub transmission
WSun and planet gear
WTorque multiplier
WWorm drive
WWuest type herringbone gear