The types of gears can be divided according to different classification criteria, as follows:
Sort by tooth line shape. Spur gear, helical gear, herringbone gear, curve gear.
Classification by gear shape. Cylindrical gear, bevel gear, non-circular gear, rack, worm gear.
Classified by the surface on which the teeth are located. External gear, internal gear.
Classified by manufacturing method. Casting gear, cutting gear, rolling gear, sintering gear, etc.
Classification by tooth shape of gears. Involute gear, cycloidal gear, arc gear.
Classified by gear mounting mode. Parallel shaft gear (including spur gear, helical gear, internal gear, rack and helical rack, etc.), intersecting shaft gear (including straight bevel gear, spiral bevel gear, zero bevel gear, etc.), staggered shaft gear (including staggered helical gear, worm gear, hypoid gear, etc.).
In addition, there are pressure Angle classification, including small pressure Angle gear and large pressure Angle gear.
