The helical planetary reducer can be regarded as a set of cylindrical gears with misaligned thin gears, so the contact points of each part are located at different parts of the tooth profile, thereby producing the effect of compensating the error of each thin gear.The elasticity of the teeth is very efficient, so a tooth with an error of less than 10 mm can average out, and under load, run as smoothly as a tooth with an error of 1 mm.Since at a given moment approximately half of the time (assuming a certain degree of overlap of 1.5) there will be two teeth, this has an added benefit in terms of strength.Therefore, the stress can be based on 1.5 times the tooth width instead of one tooth width.
The main disadvantage of spur planetary gear units is that they generate vibration.Whether due to design, manufacturing, or deformation, some variation in the involute profile may occur simultaneously along the entire tooth flank.This will result in periodic one-shot firing of each tooth, which is usually quite intense.The resulting vibrations cause large loads and noise on the gears.Another disadvantage is that the additional strength sometimes obtained by the meshing of two pairs of teeth during the contact time cannot be exploited because the stresses are limited by the conditions of a single tooth meshing in the cycle.
First of all, starting from the gear system, when two different gears are running well, the accuracy requirement of the helical gear is definitely higher than that of the spur gear.Then, from the perspective of planetary reducer product structure analysis, the bracket of the helical planetary reducer must be supported by a double support structure, and the bracket of the spur gear planetary reducer can be directly used as a single support or double support.
The precision, noise and efficiency of the single technical support of the spur gear can not be lower than the double support of the spur gear.Compared with the helical gear planetary reducer, the precision of the double-supported cylindrical planetary reducer is higher than that of the spur gear, so the precision of the helical gear planetary reducer is higher.
