Discussion on gear accuracy grade standard of reducer

For the gear reducer, the accuracy has always been a very important index to measure the quality of the reducer. Many customers will ask how high the accuracy of your gear reducer can reach, but many customers are not very familiar with this. Today, I will give you a brief introduction on the accuracy.

The gear accuracy of the gear reducer has 12 grades, which are represented by the numbers 1, 2, 3,... 12 in order from high to low. The commonly used grades are 5 to 9. In addition, according to different requirements for motion accuracy, transmission stability and load distribution uniformity, the tolerances of each accuracy level are divided into three groups, i.e. the first tolerance group, the second tolerance group and the third tolerance group. The accuracy grade of the gear of the gear reducer shall be determined according to the purpose of transmission, service conditions, transmission efficiency, circumferential speed and other economic and technical indicators.

Grade 5 gear is precision grade. Processing method: it is processed on the precision gear machine tool with very small periodic error. The tooth surface is finally precision ground, and large gears are ground or shaved after Hobbing with precision hobbing. The tooth surface roughness reaches 0.4-0.8. Scope of use: gear for precision indexing mechanism; For gears with high speed and high requirements for running stability and noise; Gears for high-speed steam turbines, etc.

The 7-Stage gear is of relatively high accuracy. Processing method: generating processing on high-precision gear machine tool. Non quenched tooth surfaces are cut with high-precision tools; Hardened gears need finishing (grinding, shaving, grinding, etc.). The tooth surface roughness reaches 1.6. Scope of use: for high-speed, small load or reverse gear; The feed gear of the machine tool needs a gear with matching movement; Medium speed reduction gear; Aircraft gear; Medium speed gear with herringbone teeth, etc.