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针对齿形的结构，在相同模数条件下，提出了应力场偏差的计算公式，并计算出对称齿形齿轮与不对称齿形齿轮模数的变化量，从而得出通过改变非工作齿廊压力角实现减少不对称齿形齿轮的尺寸和质量的结论．
According to the structure of tooth profile, under the same modulus condition, the formula of stress field deviation is proposed, and the variation of module number of symmetrical gear and asymmetrical gear profile is calculated. The pressure angle achieves the conclusion of reducing the size and the mass of the asymmetrical toothed gear.