目前,在工程机械的动力换档行星变速箱上,行星齿轮的支承广泛使用无内、外圈的滚针轴承,行星齿轮的内孔和行星齿轮轴的表面直接当作滚针轴承的滚道,故该表面须有一定的硬度。滚道的表面硬度影响滚针轴承的容量,其关系如下。C_H=f_H·C式中C_H—考虑硬度影响的滚针轴承容量f_H—硬度影响系数C—轴承的额定动负荷,一批同样轴 At present, on the power shift planetary gearbox of construction machinery, the support of the planetary gear is widely used without the inner and outer ring needle roller bearings, the inner hole of the planetary gear and the surface of the planetary gear shaft are directly used as the raceway of the needle roller bearing , So the surface must have a certain hardness. The surface hardness of the raceway affects the capacity of needle roller bearings, the relationship is as follows. C_H = f_H · C Where C_H- Needle Bearing Capacity Considering Hardness f_H Hardness Influence Coefficient C-Bearing Dynamic Load Rating, Same Number of Axes