准双曲面齿轮的修正节锥设计方法及切齿试验

为了提高准双曲面齿轮的强度和耐磨性，提高准双曲面齿轮的使用寿命，提出准双曲面齿轮的修正节锥设计方法。在不改变大轮外径和中点工作齿高的的情况下，令大轮的齿顶高系数fa≤ ，从而可以导出新的节锥参数，此时新的节锥与面锥重合或在准双曲面齿轮实体之外。利用齿面接触分析(TCA)、齿面承载接触分析(LTCA)和有限元法(FEM)，分析齿轮副的啮合性态、齿面接触应力、齿根最大拉伸应力和齿根最大压缩应力。计算机模拟显示，采用修正节锥设计方法设计的准双曲面齿轮的齿面接触应力、齿根最大拉伸应力和齿根最大压缩应力显著减少，采用修正节锥设计方法设计的准双曲面齿轮在加工过程中可用一般的刀具，不需要特殊的工具。

MODIFIED PITCH CONE METHOD IN THE HYPOID GEAR DESIGN AND TOOTH-CUTTING EXPERIMENT

In order to improve the strength and endurance of hypoid gear, and extend the lifetime of hypoid gear, the modified pitch cone method is firstly introduced. On the condition of the invariant mean working tooth depth, invariant outer diameter of gear and the gear addendum coefficient ≤0, the new pitch cone parameters are derived. The new pitch cone is coincident to face cone or out of the gear solid. The meshing behavior, the tooth surface contact stress, the maximum tensile bending stress and the maximum compressive bending stress are researched by using tooth contact analysis (TCA), loaded tooth contact analysis (LTCA) and finite element method (FEM). The computer simulation results show that the tooth surface contact stress, the maximum tensile bending stress and the maximum compressive bending stress of the pinion to hypoid gear pair designed by new method are markedly reduced. The results of the experiment show that the new type hypoid gear can be processed by the general cutter, and doesn’t need other special tools.