The main reasons for using helical gears in the manufac […]
The main reasons for using helical gears in the manufacture of cycloid reducers are as follows:
The reason why the cycloidal pin wheel does not choose a spur gear is mainly due to the vibration of the spur gear! Due to external reasons such as design and manufacturing or deformation, some changes in the involute profile may occur along the entire tooth surface at the same time. The resulting vibration will cause a large load on the gear, that is, cause noise. Another disadvantage is that sometimes the additional strength obtained by the engagement of the two pairs of teeth during the contact time cannot be used because the stress is limited by the condition of the single tooth engagement during the cycle. Huibang Transmission mainly produces helical gear series cycloid reducers with complete models and specifications.
The helical gear can be regarded as a cylindrical gear made of a set of thin gears with suitable teeth. In this way, the contact of each piece is at a different part of the tooth profile, which has the effect of compensating the error of each thin gear. This compensation effect is due to the wheel The elasticity of the teeth is very effective, so it is concluded that the gear teeth with an error of less than 10mm can average the error, so under load, it can run as smoothly as the gear with an error of 1mm. Because at any instant, there will be two teeth meshing approximately half the time (assuming the coincidence is about 1.5), which brings additional benefits in terms of strength. Therefore, the stress can be based on 1.5 times the tooth width instead of a tooth width.
It is difficult and uneconomical to manufacture and assemble a large number of thin spur gears. Therefore, they are manufactured as a whole gear with the gear teeth in the direction of the helix. Helical gears are not like spur gears in that they cause undesirable axial forces. However, the benefits in terms of vibration and strength far outweigh the disadvantages caused by axial thrust and slightly increased manufacturing costs.