Apr 9, 2020 Viewed: 641 Tag: Gear Machining  

Material characteristics of planetary gears

The main features of planetary gear transmission are small size, large carrying capacity, and stable operation. However, the high-power high-speed planetary gear transmission structure is relatively complex, requiring high manufacturing accuracy.

The commonly used steels for manufacturing planetary gears are quenched and tempered steel, quenched steel, carburized quenched steel and nitriding steel. The strength of cast steel is slightly lower than that of forged steel, and it is often used for planetary gears with larger sizes; gray cast iron has poor mechanical properties and can be used in light-load open gear transmission; ductile iron can partially replace steel for planetary gears; plastic The gears are mostly used in places with light load and low noise. The gears with which they are paired generally use steel gears with good thermal conductivity.

The development of gear theory and manufacturing process will be to further study the mechanism of gear tooth damage, which is the basis for establishing a reliable strength calculation method, and the theoretical basis for improving the carrying capacity of planetary gears and extending the life of planetary gears; The new tooth shape represented by; the research of new gear materials and the new process of manufacturing planetary gears; the study of the elastic deformation of planetary gears, the manufacturing and installation errors and the distribution of temperature field, and the modification of the gear teeth to improve the smoothness of gear operation , And increase the contact area of the gear teeth when fully loaded, thereby improving the load-bearing capacity of the gear.

Friction, lubrication theory and lubrication technology are the basic work in the research of planetary gears. Studying the theory of elastic fluid dynamic pressure lubrication, promoting the use of synthetic lubricating oil and adding extreme pressure additives to the oil, can not only improve the load capacity of the tooth surface, And it can also improve transmission efficiency.

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