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倾斜式双滚子包络环面蜗杆传动几何特性分析

Keywords: 无侧隙,双滚子,环面蜗杆传动,几何特性

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Abstract:

为消除环面蜗杆传动齿侧间隙,提出倾斜式双滚子包络环面蜗杆传动,采取双排滚子错位布置,且滚子轴线与蜗轮径向倾斜一定角度.阐述了倾斜式双滚子包络环面蜗杆传动的工作原理,依据空间齿轮啮合理论和微分几何理论,采用运动学法建立了蜗杆副的静态坐标系及活动坐标系,推导了该新型环面蜗杆齿面方程,并导出了该传动的蜗杆轴向截面齿廓方程、法向截面齿廓方程、一界函数、螺旋升角等几何特性相关的方程及计算公式,分析了滚柱半径R、滚柱偏距c2、倾斜角γ等啮合参数对蜗杆几何特性的影响.结果表明:该新型传动蜗杆喉部齿廓非常接近直线,蜗杆不会发生根切和齿顶变尖现象.要使该传动保持良好的几何特性,R不宜超过12mm,c2在5~9mm之间,γ在18°~25°之间.

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