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[Gear] cast material
     Manufacture of gears commonly used steel has quenched and tempered steel, hardened steel, carburizing steel, and nitriding steel. Slightly lower than the forged steel strength steel, commonly used in a larger size gear; the poor mechanical properties of gray cast iron, can be used for light load open gear drive; ductile iron may be partially replaced by steel gear; multi-purpose plastic gear in light load and low noise requirements of local, paired with good thermal conductivity is generally gear steel gear. And the development of the theory of gears and manufacturing processes will be further study the mechanism of tooth damage, which is to establish a reliable method of strength calculation basis is to improve the carrying capacity of gears, gear extended theoretical basis of life; the development of a circular arc tooth profile represented new tooth; research of new materials and manufacturing gear gear new technology; the elastic deformation of gear, manufacture and installation errors and the distribution of temperature field, performed tooth modification to improve the smoothness of running gear and at full load when increasing the contact area of the tooth, thereby improving the carrying capacity of the gear.

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