Measurement accuracy of profile deviation was affected when adopting normal polar coordinate in the gear, measuring center, and also instrument structure was complex. Therefore, Radial polar coordinate method was adopted to measure profile deviation for large gear, by generating involutes using radial benchmark and rotating benchmark, as well as avoiding using tangential benchmark. The mathematical model was established according to the principle of involute, and then profile measurement equation was deduced combining with the working principle of gear measuring center. For further, profile deviation equation was obtained according to the definition of profile deviation. Finally, experiment was carried out utilizing a standard gear. Experiment results show that the measurement accuracy can meet the engineering requirement.%在齿轮测量中心上采用法线极坐标法测量大齿轮齿形偏差,仪器结构将过于庞大,影响测量精度.利用径向长度基准和回转基准生成渐开线,实现极坐标法测量大齿轮的齿形偏差,避免了使用切向长度基准.以渐开线原理为基础,建立了极坐标系下齿轮渐开线数学模型；结合齿轮测量中心的工作原理,给出了齿轮渐开线测量方程；根据齿形偏差的定义,得出了齿形偏差的测量方程；并对标准齿轮样板进行了测试实验.实验结果表明,在齿轮测量中心上采用极坐标法测量齿形偏差,测量精度满足生产实际的要求.
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