行星滚轮摩擦传动自适应加载机构研究  

Self-adaptive loading mechanism based on logarithmic spiral profile connection for planetary friction drives

作　　者：潘浓芬[1] 陈德生[1] 

机构地区：[1]浙江工业大学职业教育与技术学院,浙江杭州310032

出　　处：《机械设计》2013年第3期44-48,共5页Journal of Machine Design

基　　金：浙江省自然科学基金资助项目(Y1110418);浙江省教育厅科研资助项目(Y200908637)

摘　　要：设计了一种行星圆柱滚轮摩擦(牵引)传动装置。它由太阳轮、行星轮、中心轮、行星轮保持架和输入轴组成。太阳轮做成中空并与输入轴通过3段对数螺线型面连接。这样,当输入轴输入运动和转矩时,由于3段弧形楔的楔入作用,使得太阳轮产生弹性变形,从而在太阳轮与行星轮之间及行星轮与中心轮之间自动产生摩擦传动所需的正压力。输入转矩越大,楔入作用越强,产生的正压力越大,反之亦然。故此装置具有自作用、自适应特征。由于此行星滚轮摩擦传动装置采用了圆柱滚子,从而避免了因采用圆锥滚子而可能产生的滚子自转现象的出现。也由于采用对数螺线的型面连接,使得被连接型面之间的接触应力呈均匀分布状态,减小了应力集中的现象,提高了连接表面的接触疲劳寿命。该研究拓展了行星滚轮摩擦传动自适应加载的方法。A planetary cylindrical roller friction-drive device was developed.It consists of a sun roller,three planetary rollers,an outer ring,a stationary carrier and an input shaft.The sun roller is hollow and connected through three logarithmic spiral profiles to the input shaft.Thus,as the input shaft rotates relatively to the sun roller,a wedging action takes place between the input shaft and the sun roller.This makes the sun roller generate a certain amount of elastic deformation,so an appreciable amount of contact load is generated between the sun roller and the planetary rollers and between the planetary rollers and the outer ring.The greater the input torque is,the stronger the strength of the wedging action and the greater the contact load,and vice versa.So this device is self-actuating.Here,as cylindrical rollers are used in the planetary friction-drive device,the spin motion as would present in the case that tapered rollers were used will not occur.Meanwhile,as a logarithmic spiral is used in the profile connection,the distribution of contact stress between the two connected surfaces will be uniform.This reduces the concentration of contact stress of the connected surfaces,and prolongs the life of the contact fatigue of the contacting surfaces.This research expands the adaptive loading method of the planetary roller traction drive.

关 键 词：摩擦传动 自适应加载 行星滚轮机构 型面连接 对数螺线 

分 类 号：TH12[机械工程—机械设计及理论]