Gear by gear, gear shapes, tooth shape, tooth surface and manufacturing method of classification.
Tooth shape of gear including tooth profile curve, pressure angle, height and variable. Involute gear easier to manufacture, so the modern use of the gear and involute gears an absolute majority, and cycloidal gear and circular arc gears application is less.
In terms of pressure angle, small pressure angle of gear load capacity of small and large pressure angle gear, although a higher load capacity, but under the same torque increases the bearing load, so only for special cases. The height of the gear is standardized, and are commonly used as the standard height. More advantages of gear, has spread in all types of machinery and equipment.