In the process of gear processing, the small pressure angle gear has a small bearing capacity, while the large pressure angle gear has a higher bearing capacity, but under the same transmission torque, the bearing load increases, so it is only used in special cases. And the tooth height of the gear has been standardized, and the standard tooth height is usually used. Modified gears have many advantages and have been widely used in various mechanical equipment.

The gear material and heat treatment process have an impact on the gear's load-carrying capacity, size and weight. Before the 1950s, carbon steel was used for gears, alloy steel was used in the 1960s, and case-hardened steel was used in the 1970s.

According to the hardness of the tooth surface, the gear has a soft tooth surface and a hard tooth surface. Gears with soft flanks have low bearing capacity, are easy to manufacture and have good running properties, and are mostly used in environments with low requirements. In the paired gears, the small wheel has a heavy load, so the hardness of the tooth surface of the small wheel is higher than that of the large wheel.

The machining and manufacturing costs of gears are relatively high. Some are gears with special tooth shape or high precision. Because special or high precision machine tools, tools and measuring instruments are required, the manufacturing process is complicated and the cost is high. Low precision, transmission noise, vibration and shock, pollute the environment. No overload protection effect.

The above is an introduction to what materials are needed for gear processing and production.