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近代仪器设计制造中,在某些情况下由于结构上的原因,不可避免地必须在传动链内插入万向传动轴来满足距离可调的要求。例如图1所示的大型电影经纬仪的俯仰传动系统中,精密蜗轮9直接与望远镜相连接,并由S569直流伺服电动机4驱动,在由伺服电动机驱动的主传动齿轮箱3的输出轴与传动蜗杆6之间,即是采用了一根精密万向传动轴5。从而对其提出不仅要传递一定值的扭矩,并且必须具有高精度、虚动量小,并能保持长期润滑等条件。本文将对这类精密的万向传动轴的精度分析和虚动量的估算作一探讨。
In modern instrument design and manufacture, in some cases, due to structural reasons, it is inevitable to insert a PTO shaft in the transmission chain to meet the requirements of adjustable distance. For example, in the pitch motion system of the large theodolite shown in FIG. 1, the precision worm gear 9 is directly connected with the telescope and is driven by the S569 DC servo motor 4. When the output shaft of the main transmission gearbox 3 driven by the servo motor and the transmission worm 6, that is, using a precision universal joint shaft 5. Therefore, it is proposed not only to transmit a certain value of torque, and must have high precision, small virtual momentum, and can maintain long-term lubrication and other conditions. In this paper, the precision analysis and the estimation of the virtual motion of this kind of precision universal joint transmission shaft are discussed.