在摩擦角小于半锥角的情况下，给出了极限承载能力的近似计算公式。
The approximate formula for limit load is found when the fraction angle is less than the half conical one.
极限压力角受偏置角、大小轮的螺旋角、节锥角和中点的分度圆直径影响，而与齿面的其他参数无关等结论。
The limit pressure angle is related to such factors as offset angle, mean spiral angle, pitch cone angle and mean pitch cone diameter, not to geometrical shape of the tooth surface.
本文首先给出了集值映射序列的极限映射的上半连续性与J -凸性；其次解决了集值映射序列的极限映射的锥次微分的存在性。
In this paper, we have discussed some problems about the upper semi-continuity and J-convexity of the limit mapping of set-valued mapping sequence.
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