偏心变位齿轮在分插机构中的设计及应用

Design and Application of the Eccentric Modified Gears in planetary transplanting mechanism

针对偏心齿轮行星系分插机构存在啮合间隙的问题,提出一种变位系数随齿轮节曲线位置变化的设计方法来改变齿厚,消除齿侧间隙。根据节曲线位置计算出偏心齿轮几何中心距的变动系数,确定齿隙,对偏心齿轮进行连续的非零不等量变位,设计出偏心变位齿轮;利用工具齿条包络出齿轮的齿廓,获得偏心变位齿轮的齿廓数据;采用粉末冶金方法加工出偏心变位齿轮,并成功应用于齿轮行星系分插机构。实验结果表明:与偏心齿轮分插机构相比,采用此种方法设计的偏心变位齿轮行星系分插机构,可以实现无侧隙传动。

A design method for eccentric gears is proposed,in which the modification coefficient varies with the position of the pitch curves of eccentric gears to change the tooth thickness and eliminate the tooth backlash.The center distance modification coefficient is worked out according to the location of the pitch curves of eccentric gears,the backlash is determined,the continuously variable modification coefficient is calculated,and the eccentric modified gears are designed.According to the involutes tooth profile generating principle,the tooth profile data is obtained.The eccentric modified gears are manufactured through powder metallurgy,and have been successfully applied to the planetary transplanting mechanism.The experiment results show that,the planetary transplanting mechanism with eccentric modified gears can achieve non-backlash meshing transmission.