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       gear is an important mechanical element in the transmission of motion and power, and gear material has a great impact on the bearing capacity and structural size of gear. reasonable selection of gear material is one of the important contents of gear design. it can be seen from the failure form of the gear teeth that when designing the gear transmission, the tooth surface should have enough hardness to ensure the ability of the tooth surface to resist wear, pitting, scuffing and plastic deformation; the gear tooth core shall have sufficient strength and toughness to ensure the ability of tooth root to resist bending and fracture.

       therefore, the basic requirements for the performance of gear materials are: hard tooth surface and tough tooth core. at the same time, the gear material should also have good machining and heat treatment process and economic requirements. the following are commonly used gear materials: 1. steel the steel has good toughness and impact resistance. it can also improve its mechanical properties and hardness of tooth surface through heat treatment or chemical heat treatment, so it is most suitable for manufacturing gears. (1) cast steel except for those with large size or complex structure and shape that are only suitable for casting, forged steel is generally used to make gears, and carbon steel or alloy steel with carbon content of 0.15% - 0.6% is commonly used. (2) cast steel cast steel has good wear resistance and strength, but it should be annealed and normalized, and quenched and tempered if necessary. cast steel is often used for gears with large size.

        2. cast iron gray cast iron is brittle and has poor impact resistance and wear resistance, but has good resistance to scuffing and pitting corrosion. grey cast iron gears are often used in situations with stable operation, low speed and low power. 3. non-metallic materials for gear transmission with high speed, light load and low precision, in order to reduce noise, non-metallic materials (such as cloth plastic, nylon, etc.) are often used as small gears, while large gears are still made of steel or cast iron. in order to make the big gear have enough wear resistance and pitting resistance, the hardness of the tooth surface should be 250-350hbs. jinli transmission provides core transmission scheme for ai!