In order to make the diameter of sh

In order to make the diameter of shaft and spline not smaller than the diameter of stem, the end of machined spline tends to be thicker and the depth of local spline keyway is reduced, so the number of spline teeth must be increased accordingly. Most of the failure forms of half shafts are torsional fatigue failure, so the fillet radius of each transition part should be increased as much as possible in structural design to reduce stress concentration. In order to make the transition fillet between shaft and flange have a larger radius without interference from other parts, the shaft flange is usually forged by flat forging machine.This design adopts 40 half shafts, and the heat treatment of half shafts adopts high frequency and medium frequency induction quenching. This treatment hardens the surface of the shaft to the depth of the hardened layer, which is about 1/3 of its radius. The hardness of the heart can be determined as follows. Hardness of non-quenched zone (edge, etc.) can be set within this range. The static strength and fatigue strength of the shaft are greatly improved, especially the fatigue strength is significantly increased due to the formation of a large surface residual compressive stress shaft, the use of shot peening and the transition angle of the root edge of the rolling shaft, and so on.