Spur gears are widely used transmission components. In the traditional design process, the noninvolute part of the tooth profile\ncurve is difficult to describe with mathematical equations. This article puts forward a new parametric modeling method, which can\ndescribe the modified involute part of spur gears and parameterize and optimize the transition part of the involute curve of the\nspur gear. And this model of the spur gear can be created by parameters which is input in Scilab software and the spur gear graphic\ncan be completed correspondingly. The experiments show that this modeling method can more quickly produce the standard spur\nor modified spur gear, and it also improves the efficiency and accuracy of spur gear modeling.
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