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       with the development of modern technology and technology, as well as the improvement of power and precision, the precision requirements for gear transmission quality will also be improved. the accuracy of involute cylindrical gear transmission is divided into 13 grades, of which grade 0 is the highest and grade 12 is the lowest.

     according to the national standard, the accuracy index of gear transmission is expressed by three tolerance groups. 1st tolerance group. the accuracy of gear transmission motion is determined by the angular error in the gear-rotary. 2nd tolerance group. it is expressed by the angle error between gear and tooth, which determines the smoothness of gear operation. 3rd tolerance group. the uniform degree of gear load distribution is determined by the shape, position and size of the meshing area.

       when selecting the gear accuracy level, the main use functions should be met first, and then other requirements should be considered from the perspective of reducing manufacturing costs. for example, the gear transmission in the instrument is mainly to ensure the movement accuracy; the gear transmission in the aviation power transmission device is mainly to ensure the stability accuracy; gear transmission in rolling mill is mainly to ensure contact accuracy. the same accuracy grade can also be selected for the three accuracy indexes of the same gear. jinli transmission provides core transmission scheme for ai!