摘要
根据文献[1]推导出的主滚轮纯滚动的动力学必要条件进行了进一步分析,结合某反圆柱凸轮设计实例进行了计算,将主滚轮简化成厚度为t,密度为ρ,外部半径为R,内孔半径为Rn的圆盘,分别进行了回转体有无角加速度ε1的判断计算。分析结果表明,在ε1=0时,能满足滚轮纯滚动,而当ε1达到32 000rad·s-2时,出现了突然而短暂的非滚动状态,并且滚轮正压力近似增大3倍。同时指出适当减小主滚轮厚度t、增大主滚轮内孔半径Rn、减小主滚轮外部半径R均有助于实现纯滚动。此研究成果将对合理设计凸轮机构提供参考。
Detailed analysis and study were given based on dynamics necessary condition of roller＇s pure rolling deduced in previous paper. Taking a certain inverse cylinder cam mechanism as design example, and using simplified main roller as a circular plate which thickness t, density p, external radius R and inner radius Rn, judgement analysis and calculation with and without rotating body＇s angle accelaration el were performed. The analyzed result showed that when ε1 =0, the main roller can purely roll, but when ε1 up to 32 000 rad·s^-2 , the main roller has short and non-pure rolling state, and its pressure can increase up to 3 times. At the same time, the analyzed result also showed that properly reducing thickness t of the roller, increasing the Rn, reducing R can be helpful to realize roller＇s pure rolling. This study result can provide some reference for profound design of inverse cylinder cam mechanism.
出处
《火炮发射与控制学报》
北大核心
2008年第4期97-99,共3页
Journal of Gun Launch & Control
关键词
机械设计
反圆柱凸轮
纯滚动
摩擦
mechanical design
inverse cylinder cam
oure rolling
friction
