变速比活齿机构.docVIP

非匀速活齿机构的传动原理及典型结构* 刘大伟1 任廷志1 章裕琳2 (1. 燕山大学国家冷轧板带装备及工艺工程技术研究中心 秦皇岛 066004 2. 中国重型机械研究院股份公司 西安 710032) 摘要：由于活齿传动具有结构紧凑，承载能力强，工艺性好等突出优点，将其扩展到非匀速传动领域。首先以推杆活齿传动为例，介绍非匀速活齿机构的基本结构，利用简单的余弦函数构建了内圈齿廓方程，并根据给定传动比函数，建立外圈齿廓方程；其次对活齿机构连续传动的判定准则，以及内，外圈齿廓与推杆之间的压力角进行了讨论，为非匀速活齿机构的设计提供了理论依据；另外根据活齿机构中推杆的初始位置，将其划分为两种基本的传动机构，分别固定内圈，外圈和活齿架后，演化出十种具有不同传动特性的非匀速活齿机构。最后建立了具有椭圆齿轮传动特性的活齿机构，分析了同一组设计参数下，组装结构不同时的十种传动效果，并将其与非圆齿轮传动进行了比较。仿真示例表明，非匀速活齿机构设计制造简单，能实现的变速传动效果多样，具有广阔的应用前景。 关键词：活齿传动 非匀速传动 齿廓模型 压力角 中图分类号：TH132 Transmission theory and typical structure of nonuniform mechanism with movable teeth LIU Dawei1 REN Tingzhi1 ZHANG Yulin2 (1. National Engineering Technology Research Center of Cold Rolling Strip Equipment and Technology, Yanshan University, Qinghuagndao 066004 2. China National Heavy Machinery Research Institute Co.,Ltd, Xi’an, 710032) Abstract: Thanks to characteristics of compact structure, high load strength and good manufacture technics, the movable teeth transmission is expanded to the nonuniform transmission filed. Firstly, the basic structure of nonconstant mechanism with movable rods is introduced. The profile formula of inner ring is constructed by simple cosine function and the outer is built under given transmission ratio. Secondly, the continuous rotation condition and the pressure angle among the rods, inner and outer rings of movable teeth device are discussed, which could provide theory base for its design. In addition, according to the initial position of movable rods, the mechanism is divided to two basic types. Then ten different results are developed by fixing the rods, inner ring and outer ring separately. Finally, a movable teeth device with kinematic feature of elliptical gears is designed. An analysis of ten motion types of the mechanism is made under a set of same geometric datum, with its characters compared with that of elliptical gears. The simulation states that the nonuniform mechanism with movable teeth has bright application prospects by si