Strength And Reliability Analyses For A Small Teeth Difference Mechanism Based On FEA

小齒差機構基於有限元素法的強度和可靠度分析

蔡有藤(Yuo-Tern Tsai) ； 王國雄(Kuo-Shong Wang) ； 林寬泓(Kuan-Hong Lin)

《中國機械工程學刊》 41卷1期 (2020/02) Pp. 1-10

摘要

Speed-reduced mechanisms designed with small teeth difference (STD) possess many excellent features such as small volume, compact structure, and high reduced ratios, etc. This paper presents the designed methods of STD mechanisms including interference analysis and stress evaluation of the paired gears. The interference conditions are investigated for giving proper shifting amounts for the gears to avoid meshing interferences. The geometric models of a STD mechanism are created using CAD software for performing interference analysis and stress evaluation. The stresses of the gear sets are simulated using Finite Element Analysis (FEA). An evaluated procedure of stress variations is proposed. The reliabilities of the mechanism are further rated according to the analyzed stresses so that the allowed loads can be decided accordingly. The study is useful in structural design, stress analysis and reliability evaluation for a reducer designed with involute gears.

關鍵字

speed-reduced mechanism ； design ； stress analysis ； reliability

並列摘要

減速機構設計用小齒差（STD）具有很多優良特性，如體積小、結構緊湊，減速比高等。本研究發表小齒差機構的設計方法，包括干涉分析，應力估計，使用移位齒形消除干涉，本文研究不同齒數差齒輪齧合無干涉移位量，以為設計STD機構齒輪基礎。用CAD軟體創建一STD機構以進行干涉分析和應力估計，使用有限元素法（FEM）分析齒輪齧合在不同齒數差下的應力，以為評估機構應力失效優先次序。本研究提出了一應力變異估計法，結合先前應力分析評估機構可靠度，以為決定容許負載基礎。綜合而言，本研究之應力分析和可靠度評估技術可用於漸開線齒輪減速器之設計開發。