【摘要】：武裝直升機(jī)是執(zhí)行低空和超低空作戰(zhàn)任務(wù)最有效的武器,但同時(shí)也容易受到從天上到地面多方位、多種類的攻擊,其傳動(dòng)系統(tǒng)中彈漏油的概率很大。直升機(jī)減速器在漏油失去潤(rùn)滑條件下,由于大量摩擦熱引起零部件熱變形,將可能使得其弧齒錐齒輪傳動(dòng)系統(tǒng)齒輪嚙合側(cè)隙或滾動(dòng)軸承正常游隙消除而導(dǎo)致傳動(dòng)失效。為研究這一極端條件下弧齒錐齒輪傳動(dòng)系統(tǒng)的生存壽命,本文以某型直升機(jī)尾減速器弧齒錐齒輪傳動(dòng)系統(tǒng)為研究對(duì)象,基于機(jī)械學(xué)、摩擦學(xué)、熱彈性力學(xué)等理論,對(duì)弧齒錐齒輪傳動(dòng)系統(tǒng)的摩擦功率損失、溫度場(chǎng)、熱變形及生存壽命進(jìn)行了計(jì)算分析,主要工作和成果如下:1、首次較為系統(tǒng)地開展了失去潤(rùn)滑條件下弧齒錐齒輪傳動(dòng)系統(tǒng)生存壽命研究,并構(gòu)建了從系統(tǒng)摩擦發(fā)熱、溫度場(chǎng)、熱變形、工作間隙的變化到生存壽命預(yù)測(cè)這一系統(tǒng)完整的研究思路。2、建立了弧齒錐齒輪摩擦功率損失計(jì)算模型,采用正交試驗(yàn)法分析了壓力角、中點(diǎn)螺旋角、大端端面模數(shù)、齒寬、輸入轉(zhuǎn)速和輸入功率對(duì)弧齒錐齒輪摩擦功率損失的影響及各因素的影響程度,并獲得了在常用取值范圍內(nèi)弧齒錐齒輪摩擦功率損失率最低時(shí)的最優(yōu)參數(shù)組合。3、基于當(dāng)量齒輪原理,通過將弧齒錐齒輪副等效為法面當(dāng)量直齒圓柱齒輪副,提出了弧齒錐齒輪副嚙合側(cè)隙計(jì)算的簡(jiǎn)便方法。利用熱彈性力學(xué)原理,計(jì)算分析了正常潤(rùn)滑條件下傳動(dòng)系統(tǒng)的熱變形對(duì)弧齒錐齒輪副嚙合側(cè)隙及軸承徑向游隙的影響。4、采用熱網(wǎng)絡(luò)法求解了在失去潤(rùn)滑條件下弧齒錐齒輪傳動(dòng)系統(tǒng)的瞬時(shí)溫度場(chǎng)。在此基礎(chǔ)上,利用熱彈性力學(xué)原理,計(jì)算獲得了失去潤(rùn)滑條件下由于熱變形導(dǎo)致的弧齒錐齒輪副嚙合側(cè)隙及滾動(dòng)軸承游隙消除的時(shí)間,從而獲得弧齒錐齒輪傳動(dòng)系統(tǒng)在失去潤(rùn)滑條件下的生存壽命。5、基于30分鐘干運(yùn)轉(zhuǎn)生存能力的要求,對(duì)某型直升機(jī)尾減速器弧齒錐齒輪的最小嚙合側(cè)隙及軸承的最小游隙進(jìn)行了初步綜合設(shè)計(jì)。
[Abstract]:Armed helicopter is the most effective weapon to carry out low-altitude and ultra-low-altitude combat missions, but it is also vulnerable to attack from the sky to the ground in many directions and types. The probability of oil leakage in the transmission system is very high. Under the condition of oil leakage and loss of lubrication, the gear meshing clearance or the normal clearance of the rolling bearing in the gear transmission system of the spiral bevel gear transmission system may be eliminated due to the thermal deformation of the parts caused by a large amount of friction heat, which may lead to the failure of the transmission. In order to study the survival life of the spiral bevel gear transmission system under this extreme condition, this paper takes the arc tooth bevel gear transmission system of a helicopter tail reducer as the research object, based on the theories of mechanics, tribology, thermoelasticity and so on. The friction power loss, temperature field, thermal deformation and survival life of spiral bevel gear transmission system are calculated and analyzed. The main work and results are as follows: 1. The survival life of spiral bevel gear transmission system under unlubricated conditions was studied for the first time, and the friction heat, temperature field and thermal deformation of the system were constructed. The whole research idea of this system is the change of working clearance to the prediction of life. 2. The calculation model of friction power loss of spiral bevel gear with arc teeth is established. The pressure angle, the helical angle of midpoint, the modulus of large end face and the tooth width are analyzed by orthogonal test. The influence of input speed and input power on friction power loss of spiral bevel gear and the degree of influence of each factor are obtained, and the optimal parameter combination is obtained when the friction power loss rate of arc bevel gear is the lowest in the range of commonly used values. Based on the principle of equivalent gear, a simple method for calculating the meshing clearance of arc bevel gear pair is put forward by equating the arc bevel gear pair to the normal plane equivalent spur gear pair. Based on the principle of thermoelastic mechanics, the influence of the thermal deformation of transmission system on the meshing and radial clearance of the arc bevel gear pair under normal lubrication conditions is calculated and analyzed. The instantaneous temperature field of spiral bevel gear transmission system under unlubricated condition is solved by thermal network method. On this basis, the time of meshing clearance of spiral bevel gear pair and clearance elimination of rolling bearing caused by thermal deformation under unlubricated condition are calculated by using thermoelastic principle. Thus, the survival life of the spiral bevel gear transmission system under the condition of losing lubrication is obtained. 5, based on the requirement of 30 minutes dry running survivability, The design of the minimum meshing clearance and the minimum clearance of the bearing of the arc bevel gear of the tail reducer of a certain helicopter has been carried out.
【學(xué)位授予單位】：國(guó)防科學(xué)技術(shù)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TH132.41

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相關(guān)期刊論文 前1條

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本文編號(hào)：2304829