直线式作动器中精神行星传动的承载能力研究

发布时间：2018-01-25 21:05

本文关键词： 精密行星传动强过载误差承载能力　出处：《南京理工大学》2011年硕士论文　论文类型：学位论文

【摘要】：空间飞行器直线式作动器精密行星传动是重要的动力传动部件,要求体积、质量最小化,承载能力最大化,综合性能最优化。由于其技术指标要求极其苛刻,短时过载力矩是通用行星传动的数倍,可靠性要求极高,因此强过载下精密行星传动的设计理论是一关键技术瓶颈,目前没有完整的设计规范。文中重点对直线式作动器精密行星传动承载特性进行研究,旨在通过研究找出提高承载能力的规律,为合理设计提供理论依据。首先对作动器精密行星传动的强度进行理论计算,通过不同计算方法的比较,提出了适用于精密行星传动的齿根弯曲强度和齿面接触强度的计算准则。针对作动器的工作特点,研究认为齿根压缩侧的应力不可忽略,由此推得齿根压缩侧应力的计算式。然后综合强过载下众多影响承载的因素,推导出有别于通用齿轮设计的强度校核公式。根据齿轮啮合原理找出了五个特殊啮合状态,并在不同的载荷即：额定载荷、两倍额定载荷、三倍额定载荷下,充分考虑摩擦、齿根过渡曲线圆角等的影响,应用有限元分析得到啮合齿廓的应力分布规律,提出强过载下如何提高强度的技术措施。文中详细分析了制造、装配误差对精密行星传动承载能力的影响,建立了基于质量一弹簧的均载计算模型,并用精密行星传动装配体有限元离散模型进行了验证。分析了在强过载工况下,存在误差时精密行星传动的承载特性,找出了各种误差对均载的影响程度。最后利用精密行星传动装配体有限元离散模型,分析了在强过载工况下,不同内齿圈轮缘厚度对内齿圈应力、变形及行星轮均载比例的影响,为合理设计内齿圈结构提供理论依据。
[Abstract]:The precision planetary transmission of linear actuator of space vehicle is an important part of power transmission, which requires minimum volume, minimum mass, maximum bearing capacity and optimum comprehensive performance. The short-time overload torque is several times as high as the universal planetary transmission, so the design theory of the precision planetary transmission under strong overload is a key technical bottleneck. At present, there is no complete design specification. This paper focuses on the study of the bearing characteristics of the linear actuator precision planetary transmission, in order to find out the law of improving the bearing capacity and provide the theoretical basis for the rational design. At first, the strength of the precise planetary drive of actuator is calculated theoretically, and the comparison of different calculation methods is made. The calculation criteria of tooth root bending strength and tooth surface contact strength for precision planetary transmission are proposed. According to the working characteristics of actuator, the stress of tooth root compression side can not be ignored. The formula for calculating the compressive side stress of the tooth root is deduced, and then the strength checking formula different from the general gear design is derived by synthesizing many factors affecting the bearing capacity under the strong overload. According to the gear meshing principle, five special meshing states are found, and under different loads, namely rated load, double rated load and three times rated load, the effects of friction and tooth root transition curve roundness are fully considered. The stress distribution law of meshing tooth profile is obtained by finite element analysis, and the technical measures of how to improve the strength under strong overload are put forward. In this paper, the influence of manufacturing and assembly errors on the bearing capacity of precision planetary transmission is analyzed in detail, and a load-sharing calculation model based on mass-spring is established. The finite element discrete model of the precise planetary transmission assembly is used to verify and analyze the bearing characteristics of the precision planetary transmission under the strong overload condition and the error. Finally, the finite element discrete model of the precise planetary transmission assembly is used to analyze the stress of the inner gear ring under the strong overload condition with different thickness of the inner gear rim. The influence of deformation and the ratio of planetary gear load to uniform load provides a theoretical basis for reasonable design of inner gear ring structure.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH132.41

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