The commonly used steels for manufacturing gears include quenched and tempered steel, quenched steel, carburized and quenched steel, and nitrided steel.The strength of cast steel is slightly lower than that of forged steel, which is often used for larger gears; gray cast iron has poor mechanical properties and can be used for light-load open gear transmissions.Ductile cast iron can partially replace steel gears; plastic gears are mostly used where light load and low noise are required, and steel gears with good thermal conductivity are generally used for matching gears.
In the future, gears are developing in the direction of heavy load, high speed, high precision and high efficiency, and strive to be small in size, light in weight, long in life, economical and reliable.
The development of gear theory and manufacturing technology will further study the mechanism of gear tooth damage, which is the basis for establishing a reliable strength calculation method, and is also the theoretical basis for improving the bearing capacity of the gear and extending the life of the gear; the development is represented by the arc tooth profile New tooth profile; research new gear materials and new technology for manufacturing gears; research the elastic deformation of gears, manufacturing and installation errors and temperature field distribution, carry out gear modification, improve the smoothness of gear operation, and increase the contact of gear teeth at full load Area, thereby improving the load-carrying capacity of the gear.
Friction, lubrication theory and lubrication technology are the basic work of gear research.Researching the theory of elastohydrodynamic lubrication, popularizing synthetic lubricants, and adding extreme pressure additives to the oil can not only improve the load-bearing capacity of the tooth surface, but also improve the transmission efficiency.
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