本文選題：弧齒錐齒輪 + 承載能力��； 參考：《北京交通大學(xué)》2016年碩士論文

【摘要】：隨著現(xiàn)代工業(yè)的不斷發(fā)展,弧齒錐齒輪所需要傳遞的功率越來越大、承載能力越來越高、轉(zhuǎn)速越來越快、體積和重量越來越小,這些都促使了對弧齒錐齒輪的嚙合設(shè)計(jì)、加工制造、工作環(huán)境等綜合特性帶來更大的挑戰(zhàn)。目前,航空弧齒錐齒輪的設(shè)計(jì)與應(yīng)用技術(shù)已經(jīng)成為制約我國航空航天裝備向高速重載、大功率、輕量化和高壽命等方向發(fā)展的重要因素。本文是針對某航空發(fā)動(dòng)機(jī)高速弧齒錐齒輪的承載能力不足、潤滑效果不理想的問題,采用有限元法和有限體積法從結(jié)構(gòu)和潤滑兩方面展開了詳細(xì)的數(shù)值分析研究。首先,針對某航空發(fā)動(dòng)機(jī)高速弧齒錐齒輪傳動(dòng)性能達(dá)不到現(xiàn)階段使用要求的現(xiàn)狀,通過對弧齒錐齒輪的嚙合設(shè)計(jì)理論、加載接觸分析及其本身結(jié)構(gòu)進(jìn)行分析,提出了增大原有弧齒錐齒輪副模數(shù)和齒寬的改進(jìn)方案。接著,采用傳統(tǒng)的強(qiáng)度計(jì)算公式進(jìn)行校核,表明改進(jìn)后弧齒錐齒輪的接觸強(qiáng)度、彎曲強(qiáng)度和膠合承載能力均得到了提高。然后,基于有限元技術(shù)建立改進(jìn)后弧齒錐齒輪的有限元模型,對嚙合區(qū)的接觸應(yīng)力和彎曲應(yīng)力進(jìn)行了詳細(xì)分析。結(jié)果表明本次設(shè)計(jì)解決了原有齒輪強(qiáng)度裕度不足的問題,使錐齒輪接觸疲勞強(qiáng)度提高了約27.3%,輪齒彎曲強(qiáng)度提高了約40.2%,齒面膠合承載能力提高了約28.7%。其次,分析了噴油潤滑特性對高速弧齒錐齒輪承載能力的影響,由于弧齒錐齒輪的空間嚙合理論比較復(fù)雜,直接對其進(jìn)行潤滑數(shù)值分析非常困難,本文引入了當(dāng)量直齒圓柱齒輪。結(jié)合摩擦學(xué)、傳熱學(xué)、流體動(dòng)力學(xué)等理論知識(shí),并借助計(jì)算流體動(dòng)力學(xué)軟件對其噴油潤滑系統(tǒng)進(jìn)行深入研究,主要分析了其溫度場、壓力場和速度場的分布及變化趨勢。然后詳細(xì)分析了噴油潤滑的幾個(gè)主要因素(包括潤滑油粘度、齒輪轉(zhuǎn)速和噴油速度)對其承載能力的影響。得到了齒輪潤滑系統(tǒng)的溫度、壓強(qiáng)、速度分析方法,結(jié)果表明粘度和噴油速度對溫度場的影響較大,轉(zhuǎn)速和噴油速度對壓力場的影響較大,三種因素對速度場的影響均較為顯著。隨后分析了三種因素的兩兩耦合作用對潤滑的影響,得到了更為系統(tǒng)的噴油潤滑影響因素研究結(jié)論。本文改進(jìn)后的弧齒錐齒輪不僅能滿足現(xiàn)階段的使用要求,而且采用的有限元法和有限體積法將對弧齒錐齒輪承載能力的數(shù)值模擬研究提供技術(shù)支持和幫助。
[Abstract]:With the continuous development of modern industry, the arc bevel gears need to transfer more and more power, the bearing capacity is higher and higher, the speed is faster and faster, the volume and the weight are smaller and smaller, all these promote the meshing design of the arc bevel gears.Processing and manufacturing, working environment and other comprehensive characteristics bring greater challenges.At present, the design and application technology of aero-arc bevel gear has become an important factor restricting the development of aerospace equipment in our country towards the direction of high-speed heavy load, high power, lightweight and long life.In this paper, the finite element method and finite volume method are used to analyze and study the structure and lubrication of the high-speed arc bevel gear of an aero-engine due to its insufficient bearing capacity and unsatisfactory lubricating effect.First of all, in view of the fact that the transmission performance of a high-speed arc bevel gear of an aero-engine can not meet the requirements of the present stage, through the meshing design theory of the arc bevel gear, the load contact analysis and its own structure are analyzed.An improved scheme to increase the module number and tooth width of the original arc bevel gear pair is put forward.Then, the traditional strength calculation formula is used to check, which shows that the contact strength, bending strength and adhesion bearing capacity of the improved spiral bevel gear have been improved.Then, based on the finite element technique, the finite element model of the improved rear arc bevel gear is established, and the contact stress and bending stress in the meshing region are analyzed in detail.The results show that this design solves the problem of insufficient strength margin of the original gear, increases the contact fatigue strength of bevel gear by 27.3s, increases the bending strength of gear teeth by about 40.2 percent, and increases the bearing capacity of tooth surface adhesion by about 28.7.Secondly, the influence of oil injection lubrication characteristics on the bearing capacity of high speed spiral bevel gear is analyzed. Due to the complexity of space meshing theory of arc bevel gear, it is very difficult to directly analyze its lubrication numerical value.In this paper, an equivalent spur gear is introduced.Based on the theoretical knowledge of tribology, heat transfer and fluid dynamics, and with the help of computational fluid dynamics software, the distribution and variation trend of temperature field, pressure field and velocity field are analyzed.Then, the influence of several main factors (including the viscosity of lubricating oil, gear speed and fuel injection speed) on its bearing capacity is analyzed in detail.The analysis method of the temperature, pressure and velocity of the gear lubrication system is obtained. The results show that the viscosity and the injection velocity have a great influence on the temperature field, and the rotational speed and the fuel injection speed have a great influence on the pressure field.The effect of three factors on the velocity field is significant.Then, the effect of coupling of three factors on lubrication is analyzed, and a more systematic conclusion of the influence factors of fuel injection lubrication is obtained.The improved spiral bevel gear can not only meet the requirements of the present stage, but also the finite element method and the finite volume method will provide technical support and help for the numerical simulation of the bearing capacity of the spiral bevel gear.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：V232

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