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According to Hertz theory, the difference of contact stress for non-circular gearsand equivalent gearsis compared in thepaper,acalculating method of contact stress for non-circular gearsby using equivalent gearsis researched,andcomputing formulas of power and rotation speed for equivalent gears are deduced.Anumerical simulation ofcontact stress for non-circular gearshas also been conductedbasedon thefinite element method. By the comparison of fitting curves, the feasibility of using equivalent gearsinstead of non-circular gearsto calculate the contact stress is testified.