Slanted gears {bevel gear}| can change rotation direction, using straight, spiral, or hypoid teeth.
Smaller gears {pinion}| can engage racks.
Spherical outer gears can engage a central gear in epicyclic gears {planetary}|, as in transmissions.
Gears {rack and pinion gear} can have two cylinders that meet at right angles.
Gears {recirculating ball gear} can be spheres.
Gears {spur gear}| can attach to differentials to mediate axle gears.
Gears can be wheels {wheel gear}.
Gears can have a helix around a cylinder {worm, gear} that turns a wheel {worm wheel} that engages a groove.
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Date Modified: 2022.0225