What are the types and classifications of gears?

Question

Accepted Answer

Gears are classified based on their shape, size, and arrangement. Common types include spur, helical, bevel, worm, and rack gears.

Spur gears: most common type, teeth are straight and parallel to the gear axis
Helical gears: teeth are angled in a helix around the gear axis, providing smoother and quieter operation
Bevel gears: used to transmit motion between intersecting shafts, teeth are conically shaped
Worm gears: consist of a screw (worm) meshing with a gear wheel, providing high gear reduction ratios
Rack gears: straight or flat gear with teeth along a straight line, used in linear motion systems