本文關(guān)鍵詞： 精密行星傳動(dòng) 強(qiáng)過(guò)載 誤差 承載能力　出處：《南京理工大學(xué)》2011年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：空間飛行器直線式作動(dòng)器精密行星傳動(dòng)是重要的動(dòng)力傳動(dòng)部件,要求體積、質(zhì)量最小化,承載能力最大化,綜合性能最優(yōu)化。由于其技術(shù)指標(biāo)要求極其苛刻,短時(shí)過(guò)載力矩是通用行星傳動(dòng)的數(shù)倍,可靠性要求極高,因此強(qiáng)過(guò)載下精密行星傳動(dòng)的設(shè)計(jì)理論是一關(guān)鍵技術(shù)瓶頸,目前沒(méi)有完整的設(shè)計(jì)規(guī)范。文中重點(diǎn)對(duì)直線式作動(dòng)器精密行星傳動(dòng)承載特性進(jìn)行研究,旨在通過(guò)研究找出提高承載能力的規(guī)律,為合理設(shè)計(jì)提供理論依據(jù)。 首先對(duì)作動(dòng)器精密行星傳動(dòng)的強(qiáng)度進(jìn)行理論計(jì)算,通過(guò)不同計(jì)算方法的比較,提出了適用于精密行星傳動(dòng)的齒根彎曲強(qiáng)度和齒面接觸強(qiáng)度的計(jì)算準(zhǔn)則。針對(duì)作動(dòng)器的工作特點(diǎn),研究認(rèn)為齒根壓縮側(cè)的應(yīng)力不可忽略,由此推得齒根壓縮側(cè)應(yīng)力的計(jì)算式。然后綜合強(qiáng)過(guò)載下眾多影響承載的因素,推導(dǎo)出有別于通用齒輪設(shè)計(jì)的強(qiáng)度校核公式。 根據(jù)齒輪嚙合原理找出了五個(gè)特殊嚙合狀態(tài),并在不同的載荷即：額定載荷、兩倍額定載荷、三倍額定載荷下,充分考慮摩擦、齒根過(guò)渡曲線圓角等的影響,應(yīng)用有限元分析得到嚙合齒廓的應(yīng)力分布規(guī)律,提出強(qiáng)過(guò)載下如何提高強(qiáng)度的技術(shù)措施。 文中詳細(xì)分析了制造、裝配誤差對(duì)精密行星傳動(dòng)承載能力的影響,建立了基于質(zhì)量一彈簧的均載計(jì)算模型,并用精密行星傳動(dòng)裝配體有限元離散模型進(jìn)行了驗(yàn)證。分析了在強(qiáng)過(guò)載工況下,存在誤差時(shí)精密行星傳動(dòng)的承載特性,找出了各種誤差對(duì)均載的影響程度。最后利用精密行星傳動(dòng)裝配體有限元離散模型,分析了在強(qiáng)過(guò)載工況下,不同內(nèi)齒圈輪緣厚度對(duì)內(nèi)齒圈應(yīng)力、變形及行星輪均載比例的影響,為合理設(shè)計(jì)內(nèi)齒圈結(jié)構(gòu)提供理論依據(jù)。
[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.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類(lèi)號(hào)】：TH132.41

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