Figure 1 shows the design of a cylindrical gear vibration reduction slot hole structure, with a longitudinal groove in the middle of the tooth crest, which is connected to the through hole. The structural sectional view and partial enlargement are shown in Figure 2. Notching can serve three purposes:
(1) Making the cylindrical gear teeth have a rigid-flexible coupling characteristic to reduce meshing impact; When the side clearance is insufficient, it can prevent the gear teeth from getting stuck.
(2) Reduces the influence deformation between the front and rear gear teeth and the tooth surfaces on both sides, and the load deformation of the cylindrical gear teeth will not lead to the influence change of adjacent tooth pitches.
(3) Circular holes can relax some of the root stress and reduce the stress concentration at the root.
Focus on its role in vibration reduction.
| Gear | Number of teeth z | Modulus m/mm | Modification coefficient x | pressure angle α （/ °） | Tooth top height coefficient hα* | Top clearance coefficient c* | Tooth width b/mm |
| z1 | 34 | 6 | 0.394 5 | 20 | 1 | 0.25 | 60 |
| z2 | 34 | 6 | 0.394 5 | 20 | 1 | 0.25 | 60 |
To verify the vibration reduction effect of this structure, a gear pair with the structure shown in Figure 1 was specially designed for verification. The main geometric parameters of cylindrical gears are shown in the table, with the center distance between two cylindrical gears a=208 4 mm。