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  本文關(guān)鍵詞： 粗糙齒面 接觸應(yīng)力 齒輪轉(zhuǎn)速 混合熱彈流潤滑　出處：《太原理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：現(xiàn)行齒輪傳動接觸疲勞強度的設(shè)計依據(jù)是赫茲(Hertz)理論,但是該理論的使用條件是沒有潤滑油環(huán)境的光滑表面接觸,這與大多數(shù)齒輪傳動工作在混合熱彈流潤滑狀態(tài)的實際工況是不相符的。齒輪轉(zhuǎn)速是影響齒輪傳動混合熱彈流潤滑的重要參數(shù)之一,所以不少學(xué)者對此影響先后做了研究。然而,現(xiàn)有研究往往基于光滑齒面假設(shè)或假定齒面粗糙峰谷呈余(正)弦分布,導(dǎo)致研究結(jié)果具有一定的局限性。因此,基于真實粗糙齒面探究轉(zhuǎn)速對齒輪傳動混合熱彈流潤滑的影響,是完全必要的。本文首先應(yīng)用表面粗糙度輪廓測量儀實測了具有橫向紋理的圓盤試件表面粗糙度;然后,通過對實測所得數(shù)據(jù)的傅里葉非線性變換擬合出粗糙度函數(shù),并將其疊加至油膜厚度方程中從而建立了齒輪傳動混合熱彈流潤滑模型�；诖四Ｐ�,在保持潤滑油參數(shù)和齒輪傳動參數(shù)不變的基礎(chǔ)上,針對中、重載齒輪傳動,通過改變齒輪轉(zhuǎn)速,進行了702組數(shù)值計算,定量分析了齒輪轉(zhuǎn)速對粗糙齒面接觸應(yīng)力、油膜厚度的影響。分析、總結(jié)本文研究結(jié)果,可得如下結(jié)論:(1)當(dāng)傳遞功率不變時,提高齒輪轉(zhuǎn)速有利于增大油膜厚度、減小齒面壓力;同時,還會減緩油膜厚度和齒面壓力波動,并可降低接觸區(qū)次表面應(yīng)力集中現(xiàn)象。(2)當(dāng)齒輪轉(zhuǎn)速不變時,提高傳遞功率不僅會使齒面壓力增大,同時還會加劇齒面壓力與油膜厚度波動及接觸區(qū)次表面的應(yīng)力集中現(xiàn)象。(3)隨著轉(zhuǎn)速的不斷變大,齒輪傳動潤滑狀態(tài)由混合彈流潤滑逐漸變?yōu)槿櫥瑺顟B(tài),這意味著輪齒載荷由原來的齒面粗糙峰與潤滑油膜共同承擔(dān)逐漸變?yōu)橛蓾櫥湍と砍袚?dān)。(4)在相同轉(zhuǎn)速條件下,載荷(功率)變化對油膜厚度影響甚微。(5)粗糙齒面接觸應(yīng)力隨齒輪轉(zhuǎn)速的增大單調(diào)下降。在混合潤滑狀態(tài)下,其下降幅度較大;但在全膜潤滑狀態(tài)下,下降幅度比較緩慢。一般而言,工業(yè)齒輪傳動大都在混合潤滑狀態(tài)下工作。因此,增加齒輪轉(zhuǎn)速可有效降低齒面接觸應(yīng)力,從而提高工業(yè)齒輪傳動的接觸疲勞壽命。文末,運用多元回歸理論,針對中、重載九種工況,分別建立了粗糙齒面接觸應(yīng)力與齒輪轉(zhuǎn)速之間的定量關(guān)系。這些公式的建立對完善齒輪傳動接觸疲勞強度設(shè)計具有一定的借鑒意義。本項研究雖然使用了實測所得的真實粗糙度數(shù)據(jù),但是為了降低數(shù)值計算難度,所建模型仍然采用了其中一個齒面是光滑齒面的假設(shè),這與齒輪傳動實際情況有較大差異。
[Abstract]:On the basis of the current design of the contact fatigue strength of gear transmission is Hertz (Hertz) theory, but the theory of the use of conditions there is no smooth surface contact lubrication environment, the actual condition of this work and most gear drive in mixed lubrication state thermal elastohydrodynamic lubrication is not consistent. The gear speed is one of the important parameters affecting the gear mixed heat the elastohydrodynamic lubrication, so many scholars has done a study effect. However, existing studies are often based on the smooth tooth surface assumption or supposition of tooth surface roughness peak valley Chengyu (positive) string distribution, cause the results have some limitations. Therefore, the real tooth surface rough inquiry speed mixed thermal elastohydrodynamic lubrication of gear transmission based on is absolutely necessary. This paper firstly applied surface roughness measuring instrument was measured with transverse texture of the specimen surface roughness; then, based on the measurement. Fourier nonlinear transform fitting data the roughness function, which added to the oil film thickness equation is established and gear mixed thermal elastohydrodynamic lubrication model. Based on this model, based on maintaining the lubrication parameters and gear parameters unchanged, in gear transmission, by changing the gear speed of the 702 groups of numerical calculations, the quantitative analysis of the gear speed on rough tooth surface contact stress and the influence of oil film thickness. The analysis, summarize the results of this study are summarized as follows: (1) when the transmission power is constant, increasing gear speed can increase the oil film thickness, reduce the tooth surface pressure; at the same time, also slow down the oil film thickness and tooth surface pressure fluctuations, and can reduce the stress of the surface contact area concentrated phenomenon. (2) when the gear speed is constant, increasing the transmission power will not only make the tooth surface pressure increases, while also increasing the tooth surface pressure With the fluctuation of film thickness and contact area on the stress concentration phenomenon. (3) as the speed increases, the lubrication state of gear transmission has gradually changed from mixed elastohydrodynamic lubrication for liquid lubrication, which means the original tooth load of tooth surface asperity and the lubricating oil film to bear gradually by the lubricating oil film all bear. (4) at the same rotational speed, load (power) has little effect on the film thickness changes. (5) the contact stress decreased with increasing rotating speed of gear tooth surface. The rough monotone in mixed lubrication state, it decreased greatly; but in the full film lubrication regime fell. The amplitude is relatively slow. In general, industrial gears are working in mixed lubrication state. Therefore, the increase of gear speed can effectively reduce the tooth surface contact stress, so as to improve the contact fatigue life of gear industry. At the end of this paper, using multiple regression theory, for Heavy, nine conditions were established, rough tooth contact quantitative relation between stress and gear speed. To establish perfect gear transmission has certain reference significance to the contact fatigue strength design formula. In this study, although the use of the measured real rough degree according to, but in order to reduce the difficulty of numerical calculation, the the model is used in which a tooth surface is smooth tooth surface with this assumption, the actual situation of gear transmission are quite different.

【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TH132.41

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