From the point of view of saving materials and reducing quality, the cross-sections of the shaft are preferably of equal strength.But from the point of view of processing technology, the shape of the shaft is indeed as simple as possible.Simple shaft manufacturing saves labor, heat treatment is not easy to deform, and it is possible to reduce stress concentration.

　　When deciding the shape of the shaft, it is necessary to consider saving materials and facilitating processing and assembly under the premise of assembly accuracy.

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