1. The appearance of the difference

Helical gears are gears misplaced on cylindrical gears, while straight teeth are not misplaced.

2. The supporting planets of the planetary frame are different
Helical teeth need double planetary support, straight teeth can be double support or single support

3. the accuracy is different
The accuracy of helical gear is higher than that of straight gear. In terms of the structure of planetary reducer, the planetary frame of helical gear planetary reducer needs double support structure to support it, and the planetary frame of straight gear planetary reducer can do single support, and can also do double support. The single support of spur gear is far less accurate, noisy and efficient than the double support of spur gear. That support straight planetary reducer and helical planetary reducer, because the helical precision than the precision of straight tooth to do higher, so the accuracy of the helical planetary reducer will be higher.

4. Noise is different
The main disadvantage of spur gear planetary reducers is that they produce vibration. Some changes in involute shape may occur along the whole tooth surface at the same time, whether due to design, manufacturing or deformation. This results in a regular, one-tooth-for-tooth excitation, which is often very strong. The resulting vibration not only causes heavy load on the gear, but also causes noise. So straight teeth make more noise than oblique teeth.