本文選題：直齒錐齒輪　切入點(diǎn)：汽車差速器　出處：《武漢理工大學(xué)》2012年碩士論文　論文類型：學(xué)位論文

【摘要】：直齒錐齒輪因具有傳動(dòng)平穩(wěn)、效率高、承載能力強(qiáng)等優(yōu)點(diǎn),已在汽車、航空航天、石油、化工等諸多領(lǐng)域中來(lái)實(shí)現(xiàn)相交軸間的運(yùn)動(dòng)傳遞。另外,直齒錐齒輪構(gòu)成的復(fù)雜齒輪機(jī)構(gòu)因繼承雙齒嚙合到單齒嚙合的嚙合規(guī)律,具有更加復(fù)雜的輪齒嚙入嚙出規(guī)律。例如重載卡車后橋中的差速器往往長(zhǎng)時(shí)間處于重載、沖擊等復(fù)雜多變的工作環(huán)境,若能準(zhǔn)確預(yù)測(cè)齒輪在嚙合過(guò)程的齒面接觸應(yīng)力、齒根彎曲應(yīng)力和傳動(dòng)誤差等參量的變化規(guī)律,有利于人們更清楚地認(rèn)識(shí)汽車差速器的工作性能,為汽車差速器設(shè)計(jì)過(guò)程中的接觸應(yīng)力的分析提供了參考價(jià)值。另外,在現(xiàn)代工業(yè)中,齒輪的設(shè)計(jì)要求滿足高速、重載而尺寸小、重量輕的特點(diǎn)。對(duì)于這一特點(diǎn),進(jìn)行齒輪的疲勞分析來(lái)確保齒輪的設(shè)計(jì)可靠性就變得至關(guān)重要。因此,分析直齒錐齒輪的疲勞失效形式有利于人們確定齒輪副中的主要疲勞部件,并且有利于人們了解接觸疲勞應(yīng)力和彎曲疲勞應(yīng)力對(duì)齒輪壽命的影響,對(duì)于提高汽車差速器的使用壽命具有現(xiàn)實(shí)的指導(dǎo)意義。 本文根據(jù)直齒錐齒輪的嚙合原理和加工過(guò)程,在Pro/E軟件環(huán)境下,采用球面漸開(kāi)線齒廓方程,建立了直齒錐齒輪的三維參數(shù)化精確幾何模型,并進(jìn)行虛擬裝配和運(yùn)動(dòng)仿真分析,為進(jìn)行有限元分析打下了基礎(chǔ)。 利用現(xiàn)代有限元仿真分析技術(shù),在通用有限元軟件ANSYS中建立汽車差速器和直齒錐齒輪副的非線性靜態(tài)接觸分析有限元模型,分析了汽車差速器在不同嚙合位置的齒面接觸應(yīng)力和齒根彎曲應(yīng)力的分布規(guī)律,驗(yàn)證了齒端效應(yīng)的存在,討論了差速器的對(duì)稱性、行星齒輪的等效性和傳動(dòng)誤差。此外,根據(jù)疲勞累積準(zhǔn)則和疲勞曲線方程來(lái)分析直齒錐齒輪副的接觸疲勞應(yīng)力和彎曲疲勞應(yīng)力。預(yù)測(cè)了直齒錐齒輪發(fā)生疲勞的關(guān)鍵嚙合位置。通過(guò)疲勞分析的有限元模擬結(jié)果與理論計(jì)算結(jié)果的比較,證明了有限元模型的可靠性�；谶@個(gè)可靠地有限元模型,分析了主動(dòng)輪和被動(dòng)輪的疲勞應(yīng)力在工程應(yīng)用中所起的作用,并比較分析了主動(dòng)輪和被動(dòng)輪的接觸疲勞壽命和彎曲疲勞壽命。對(duì)于主動(dòng)輪和被動(dòng)輪自身的疲勞壽命和彎曲壽命也進(jìn)行了比較分析。分析結(jié)果有利于更清楚地認(rèn)識(shí)直齒錐齒輪副的疲勞失效形式。
[Abstract]:Straight bevel gears have been used in many fields such as automobile, aerospace, petroleum, chemical industry and so on because of their advantages of smooth transmission, high efficiency and strong bearing capacity. In addition, the bevel gears have been used to transfer the motion between intersecting shafts in many fields, such as automobile, aerospace, petroleum, chemical industry, etc. The complex gear mechanism composed of straight bevel gears has more complicated gear-in-and-out rules because it inherits the meshing law of double-tooth meshing to single-tooth meshing. For example, the differential in the rear axle of heavy-duty truck is often in heavy load for a long time. In complex and changeable working environment such as impact, if we can accurately predict the change law of tooth surface contact stress, tooth root bending stress and transmission error of gear in meshing process, it is helpful for people to understand the working performance of automobile differential more clearly. It provides reference value for the analysis of contact stress in the design process of automobile differential. In addition, in modern industry, the design requirements of gears meet the characteristics of high speed, heavy load, small size and light weight. It is very important to make fatigue analysis of gears to ensure the design reliability of gears. Therefore, analyzing the fatigue failure forms of straight bevel gears is helpful to determine the main fatigue components in gear pairs. It is helpful for people to understand the influence of contact fatigue stress and bending fatigue stress on gear life, and has practical guiding significance to improve the service life of automobile differential. According to the meshing principle and machining process of straight bevel gear, in the environment of Pro/E, using spherical involute tooth profile equation, the three-dimensional parameterized precise geometric model of straight bevel gear is established, and the virtual assembly and motion simulation analysis are carried out. It lays a foundation for finite element analysis. The nonlinear static contact analysis finite element model of automobile differential and straight bevel gear pair is established by using the modern finite element simulation analysis technology in the general finite element software ANSYS. The distribution of tooth surface contact stress and tooth root bending stress in different meshing positions of automobile differential is analyzed. The existence of tooth end effect is verified. The symmetry of the differential, the equivalence of planetary gear and the transmission error are discussed. According to fatigue accumulation criterion and fatigue curve equation, contact fatigue stress and bending fatigue stress of straight bevel gear pair are analyzed. The key engagement position of straight bevel gear is predicted. The comparison between the simulated results and the theoretical results, The reliability of the finite element model is proved. Based on this reliable finite element model, the effect of the fatigue stress of the active wheel and the passive wheel on the engineering application is analyzed. The contact fatigue life and bending fatigue life of the active wheel and the passive wheel are compared and analyzed. The fatigue life and bending life of the active wheel and the passive wheel are also compared and analyzed. Identify the fatigue failure form of straight bevel gear pair.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類號(hào)】：TH132.41

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