1. The helical gear is developed on the basis of spur gears.
2. In the meshing of the spur gear, the meshing principle of the gear teeth is: the gear teeth are engaged - the involute pure rolling carries out the force transmission - the gear teeth are engaged - the force transmission work is crossed to the next pair of wheels tooth.
3. As can be seen from the above, when the gear is engaged, the meshing of the teeth is actually intermittent. Due to the manufacturing error and installation error of the involute teeth, the characteristics of the intermittent transmission will be highlighted.
4. The reason why the involute is used as the tooth profile is that the transmission is smooth and the transmission ratio is constant. Due to the manufacturing error, the sudden engagement and sudden engagement of the gear teeth will cause the mechanism to form an instantaneous impact and instantaneous transmission ratio change.
5. Then, the helical gear came into being, the meshing principle of the helical gear will not be the impact of the sudden bite and sudden engagement, in the cycle of the biting, the engagement of each pair of teeth will be Gradually, there is no meshing impact phenomenon of the spur gear, the operation is relatively stable, and it is easy to ensure that the transmission ratio is constant.
6. The gear tooth surface of the spur gear is distributed along the axial direction of the gear to the full tooth width, while the force distribution surface of the helical gear is not covered with the full tooth width in the axial direction of the gear. According to this principle, the same modulus is the same. Under the premise of the same number of teeth, the force of the helical gear will be smaller than that of the spur gear. However, since the helical helix angle of the helical gear will enhance the normal force of the gear, it seems that the helical gear and the spur gear are under load. Basically ignored.
7. Therefore, large gears, impacted gears, and mechanisms that have no requirements on the transmission ratio will use spur gears. Otherwise, helical gears will be used.
8. Spur gear manufacturing is simple, helical gear manufacturing and installation is more troublesome, but running smoothly.
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