Gear - Wikipedia, the free encyclopedia
1 Comparison with drive mechanisms 2 Types 2.1 External vs internal gears 2.2 Spur 2.3 Helical 2.3.1 Skew gears 2.4 Double helical 2.5 Bevel 2.6 Spiral bevels 2.7 Hypoid 2.8 Crown 2.9 Worm 2.10 Non-circular 2.11 Rack and pinion 2.12 Epicyclic 2.13 Sun and...