In the case of constant center distance a, when the transmission ratio i=4.5, for the typical situation: the sun gear and planetary gear are carburized and quenched, and the tooth surface hardness is 57~61HRC; the inner gear is quenched and tempered, and the hardness is 262~293HBS, Has a high carrying capacity. 2. The transmission ratio that is more favorable to the structural layout From the structural design of related parts, the main effect of the transmission ratio is the rotation support of the planetary gear, that is, the planetary gear bearing.Generally, it is desirable to set the bearing in the shaft hole of the planetary gear. Therefore, when the planetary gear adopts rolling bearings, the diameter of the planetary gear should not be too small as much as possible, that is, the transmission ratio should not be too small.

　　The transmission ratio should not be too large. If the transmission ratio is too large, it will not only cause the loss of load-bearing capacity, but also make the diameter of the sun gear too much smaller than the diameter of the high-speed shaft, causing other improprieties.Transmission ratio distribution of multi-stage transmission The allowable range of transmission ratio of planetary transmission is restricted by structure and strength.

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