In the case of reducing the hole diameter properly, modifying the size of a hole alone can not completely eliminate the phenomenon of bad contact on both sides of the gear teeth. In the final scheme, the author selects the combination of the drive crankshaft hole size of 180 mm and the straight shaft hole size of 126 mm for calculation.
The tooth contact of the final scheme under the combination of aperture is shown in the figure. It can be seen from the figure that this aperture combination can completely eliminate the occurrence of bilateral poor contact.
The finite element model of star gear reducer is established, and the contact conditions of gear teeth under various aperture combinations are calculated, and the static dynamic simulation is carried out.
The results show that: the deformation of the hub of the star gear reducer has a bad effect on the meshing characteristics of the gear teeth, which shows that both sides of the meshing teeth are in contact; the dimensions of the transmission crankshaft hole and the directly connected shaft hole on the hub affect the stiffness of the hub, and reducing the hole diameter moderately can improve the number of contact teeth on both sides; The size of the straight shaft hole has a greater influence on the meshing characteristics of the gear teeth, so the size of the straight shaft hole should be considered in the optimization design of the hub of this type of star gear reducer.
Therefore, the size of bearing hole of transmission crankshaft is 180 mm and the size of directly connected shaft hole is 126 mm, which can eliminate the phenomenon of bad contact on both sides.