第20卷
会第8期
2012年8月
文章编号
1004924X(2012)08-1765-07
光学精密工程
Optics and Precision Engineering
基于圆柱凸轮的同轴变速传动机构
刘波1,2*，贾继强"，丁亚林"，苏东风"，张雷1
Vol. 20No.8
Aug.2012
（1.中国科学院长春光学精密机械与物理研究所航空光学成像与测量重点实验室，吉林长春，130033；
2.中国科学院研究生院，北京100039）
摘要：针对常规传动方式在径向空间较小情况下难以实现同轴旋转运动的变速功能，提出了一种基于圆柱凸轮的同轴变速传动机构，以变焦距镜头的结构为基础，结合使用两个圆柱凸轮，在主、从动凸轮上开出螺策线槽，使从动凸轮螺旋线槽导程为主动凸轮螺旋线槽导程的倍，从面实现速比为的变速传动。对机构的传动效率和传动精度进行分析，得出主动凸轮螺旋线槽的螺旋升角与传动效率和传动精度的关系及相关规律。在实验室对机构的传动精度进行了测试，结
果表明其速比精度在1.6%以内。此机构结构紧凑，能够自锁且精度较高。关键调：围柱四轮；同轴传动机构；螺旋线导程；传动效率；传动精度
中图分类号：TH112.2
文献标识码：A
doi;10,3788/OPE.20122008.1765
Coaxialtransmissionmechanismbasedoncylindricalcams
LIU Bol-·, JIA Ji-qiang', DING Ya-lin', SU Dong-feng', ZHANG Lei'
(1.Key Laboratory of Airborne Optical Imaging and Meaurement,Changchun Institute of Optics
Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China; 2.Graduate University of Chinese Academy of Sciences,Beijing 100039, China)
CorrespondingauthorE-mail;liubo1985gmail.com
Abstract: As conventional transmission mechanism is difficult to realize coaxial rotation transmission in a narrow radial space,a coaxial transmission mechanism based on cylindrical cams is proposed. On the basis of the structure of a lens, the transmission mechanism is combined by two cylindrical cams, and one is initiative cam and the other is passive cam. Spiral slots are opened on the surface of both cams. When the spiral lead of the passive cam is n times that of initiative cam, the transmission mech-anism can offer a transmission ratio of n. Transmission efficiency and transmission accuracy are ana lyzed and the relation between the angle of initiative cam's spiral slot and the transmission efficiency and transmission accuracy is discussed. An experiment is performed to test transmission accuracy, which shows the transmission ratio accuracy is less than 1. 6%. Obtained mechanism has compact structure,high accuracy and can be locked automatically.
Key words; cylindrical cam; coaxial transmission mechanism; spiral lead; transmission efficiency;
transmission accuracy
收稿日期：2012-04-18；修订日期：2012-06-08
基金项目：国家863高技术研究发展计划资助项目（No.2007AA701203）