There are 13 precision grades of gears, which are arranged from low to high by the numbers 0-12. Grade 0 is the highest and grade 12 is the lowest. Gear accuracy refers to the comprehensive error of gear shape, including some important parameters such as tooth shape, tooth direction, radial jump, etc.
- Tooth shape: refers to the radial shape of teeth.
- Tooth direction: refers to the longitudinal shape of teeth.
- Radial jump: refers to the error of distance between two adjacent teeth.
Gear accuracy is mainly to control the transmission accuracy between gears during operation, such as: the stability of transmission, the fluctuation of instantaneous speed, if there is alternating reverse operation, whether the backlash reaches the minimum, if there is impact load, the accuracy should be slightly improved, so as to reduce the damage of impact load to gears.
The selection of gear accuracy grade shall be determined according to the purpose of transmission, service conditions, transmission power, peripheral speed, performance index or other technical requirements.
The precision grades recommended for different mechanical transmission gears are as follows, for reference only. For specific product selection, please consult the same manufacturer for free.
The processing technology difference of different precision grade gear products is described as follows:
- Accuracy grade din6: tempering / high frequency quenching of tooth surface / grinding of tooth surface / grinding of four sides
- Accuracy class din7: tempering / tooth surface finishing milling / four side grinding
- Precision grade DIN8: tempering / tooth surface finishing milling / four side finishing milling
- Precision grade din9: quenching and tempering / high frequency quenching of tooth surface / fine milling of tooth surface / four side grinding
- Precision grade din10: tempering / high frequency quenching of tooth surface / finish milling of tooth surface / finish milling of four sides