1. The amplitude class of iso-lateral tooth deviation of gear teeth
For dividing play 5 a Ioooo, modulus diameter (normal modulus) for o. 5-70, tooth width is 4-1000 the ipsilateral tooth surface of involute cylindrical gear tolerance, including tangential comprehensive tolerance, a gear tangential comprehensive tolerance, o a single limit partial building, pitch cumulative total cumulative tolerance limit deviation, pitch, the tooth profile total tolerance, tolerance and helix GB/Tlo095.1-2008 regulation fo, 1 a, a total of 13 precision grade 12, which o level the highest, lowest grade 12.
2. Accuracy class of radial synthesis deviation
For the total radial comprehensive tolerance and one tooth radial comprehensive tolerance of the reading column gear with the dividing group diameter of 5-1000 and modulus of normal (normal modulus) of o.2-LO, GB/D to095.2 -- 2008 stipulates that there are 9 accuracy grades from 4 to 12, among which grade 4 is the highest and grade 12 is the lowest.
3. Accuracy class of radial runout
Radial runout of involute ramrod gears with indexing return diameter of 5 -- 10ooo and modulus (normal modulus) of o. 5 -- 70. (; 13 accuracy grades o, L - 12 are recommended in B/cutting machine T1009E - 22008, among which O is the highest. Level 12 lowest.
Among the gear precision grades, grade O-2 has very high precision requirements. Currently, there is generally no means of manufacturing and measurement, so it belongs to the class to be developed. Grade 3-5 is high precision grade; Grade 6-8 is medium precision grade and most widely used; Level 9 is the lower accuracy level. Elo - L2 is the lower accuracy level.
The tooth profile of involute gear reflects the change of shape. The deviation of the actual tooth profile from the designed tooth profile is called the tooth profile deviation, which is measured in the end plane and perpendicular to the involute tooth profile. The designed tooth profile refers to the tooth profile in accordance with the design provisions, and refers to the end face tooth profile when there is no special provision. The curve of tooth profile includes actual tooth profile, designed tooth profile and average tooth profile.
The working part of the halide profile is usually theoretically bleached. In modern gear design, for high speed gear transmission, in order to reduce the impact, vibration and noise caused by base gear pitch deviation and elastic deformation of gear tooth, the modified tooth profile based on the theory of involute tooth profile is often used, such as modified margin tooth profile, convex tooth profile, etc., so the designed tooth profile can be faulted line tooth profile or modified tooth layer.