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The editor of Dongguan Jichuang classifies the straight tooth planetary reducer as a precision planetary reducer, and the helical planetary reducer as a high precision planetary reducer. What are the advantages and disadvantages?
The shortcomings of spur gears in spur gear precision planetary reducers are mainly that they generate vibration. Whether due to design, manufacturing or deformation, some changes in the involute profile may occur along the entire tooth surface at the same time. This will result in a regular, one-time excitation per tooth, which is often very strong.
The resulting vibration causes both heavy loads and noise on the gears. Another disadvantage is that the additional strength sometimes obtained from the engagement of 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.
The helical gear used in the helical gear planetary reducer can be regarded as a cylindrical gear formed by a group of lamella gears that are misaligned, so that the contact of each piece is in a different part of the tooth profile, thereby generating compensation for the error of each lamella gear The compensation effect is very effective due to the elasticity of the gear teeth. Therefore, such a result is obtained. The gear teeth with an error within 10mm can make the error play an average role. Therefore, under load, the error can be within 1mm. The gear teeth run smoothly.
Because at any instant, about half of the time (assuming the degree of coincidence is about 1.5) will have two teeth engaged, which brings additional benefits in terms of strength. Therefore, the stress can be established on the basis of 1.5 times the tooth width instead of one tooth width.
It is difficult and uneconomical to manufacture and assemble a large number of thin spur gears, so it is manufactured as a united gear with teeth along the spiral direction. Helical gears are not like spur gears, it can cause undesirable axial forces. But the benefits in terms of vibration and strength far outweigh the disadvantages caused by axial thrust and slightly increased manufacturing costs.
Straight-tooth planetary reducer and helical-tooth planetary reducer can be said to have their own advantages and disadvantages. The manufacturing cost of a helical planetary reducer is higher than that of a straight-tooth planetary reducer. But the helical gear planetary reducer is very advantageous in terms of vibration and strength.
The above is the difference between the precision planetary reducer and the helical planetary reducer analyzed by Dongguan Jichuang editor. 
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