【摘要】：濕式多片摩擦離合器廣泛應(yīng)用于車輛、船舶及工程機(jī)械中的一個(gè)重要的傳動(dòng)部件,它依靠摩擦片與對(duì)偶鋼片之間的摩擦力來傳遞動(dòng)力。在濕式多片摩擦離合器的接合過程中,在控制油壓的作用下,活塞壓緊摩擦副,由于離合器的主動(dòng)部分和從動(dòng)部分存在轉(zhuǎn)速差,因此摩擦片和對(duì)偶鋼片相互滑摩,產(chǎn)生大量摩擦熱。摩擦熱流進(jìn)入摩擦片和對(duì)偶鋼片后,引起溫度場(chǎng)的改變,進(jìn)而引起熱應(yīng)力場(chǎng)的產(chǎn)生,改變了盤片的力學(xué)狀態(tài)。由摩擦熱引起的離合器內(nèi)部的溫度場(chǎng)和熱應(yīng)力場(chǎng)的改變是離合器失效的重要因素,它將導(dǎo)致摩擦片和對(duì)偶鋼片的翹曲、局部燒損、盤片表面材料剝離以及表面熱裂紋生成等形式的失效。因此,對(duì)離合器摩擦副進(jìn)行熱分析,對(duì)于解決由摩擦熱引起的離合器失效具有較高的理論意義和實(shí)用價(jià)值。 根據(jù)濕式多片摩擦離合器的基本結(jié)構(gòu),對(duì)摩擦副幾何模型進(jìn)行了合理的簡(jiǎn)化,推導(dǎo)了摩擦生熱以及摩擦熱分配的數(shù)學(xué)模型。在此基礎(chǔ)上建立了模擬濕式多片摩擦離合器摩擦片和對(duì)偶鋼片溫度場(chǎng)及熱應(yīng)力場(chǎng)的有限元模型,在較為準(zhǔn)確地確定邊界條件后,進(jìn)行了熱分析的求解。討論了離合器接合過程中摩擦片和對(duì)偶鋼片溫度場(chǎng)的空間分布規(guī)律、溫度場(chǎng)隨時(shí)間變化的規(guī)律,并通過順序耦合法求得摩擦片和對(duì)偶鋼片的熱應(yīng)力場(chǎng),得到了熱應(yīng)力場(chǎng)的空間和時(shí)間分布規(guī)律。 對(duì)離合器摩擦副中的熱彈不穩(wěn)定特性進(jìn)行了理論分析,研究了擾動(dòng)作用下對(duì)稱型和反對(duì)稱型對(duì)偶鋼片的溫度場(chǎng)、位移場(chǎng)和應(yīng)力場(chǎng)模型,得出了特征方程,求得熱彈不穩(wěn)定特性的臨界速度。著重研究波數(shù)、盤片厚度和結(jié)構(gòu)對(duì)稱性等因素對(duì)摩擦副中熱彈不穩(wěn)定現(xiàn)象影響規(guī)律。 本文的研究成果為改善濕式多片摩擦離合器的性能,延長(zhǎng)其使用壽命提供了指導(dǎo),為高性能濕式多片摩擦離合器的設(shè)計(jì)開發(fā)奠定了理論基礎(chǔ)。
[Abstract]:Wet multi-disc friction clutch is widely used in vehicles, ships and construction machinery as an important transmission component, which relies on the friction between the friction plate and the dual steel plate to transfer power. In the joint process of wet multi-disc friction clutch, under the action of controlling the oil pressure, the piston compacts the friction pair. Because of the difference of rotational speed between the active part and the follower part of the clutch, the friction plate and the dual steel sheet slip each other. Generate a lot of friction heat. When the friction heat flow enters the friction sheet and the dual steel sheet, the temperature field is changed, and the thermal stress field is produced, which changes the mechanical state of the disc. The change of temperature field and thermal stress field in clutch caused by friction heat is an important factor of clutch failure, which will lead to the warpage and local burning of friction plate and dual steel sheet. The failure of the surface material and the formation of hot cracks on the surface of the disc. Therefore, thermal analysis of clutch friction pair is of high theoretical significance and practical value in solving clutch failure caused by friction heat. According to the basic structure of wet multi-disc friction clutch, the geometric model of friction pair is reasonably simplified, and the mathematical models of friction heat generation and friction heat distribution are derived. On this basis, a finite element model for simulating the temperature field and thermal stress field of a wet multi-disc friction clutch is established. After the boundary conditions are determined accurately, the thermal analysis is carried out. The spatial distribution of temperature field of friction plate and dual steel sheet during clutch engagement and the variation of temperature field with time are discussed. The thermal stress field of friction plate and dual steel sheet is obtained by sequential coupling method. The spatial and temporal distribution of thermal stress field is obtained. In this paper, the thermoelastic instability characteristics of clutch friction pair are theoretically analyzed. The temperature field, displacement field and stress field model of symmetric and antisymmetric steel plates under disturbance are studied, and the characteristic equations are obtained. The critical velocity of thermoelastic instability is obtained. The effects of wavenumber, disc thickness and structural symmetry on thermoelastic instability in friction pairs are studied. The research results of this paper provide guidance for improving the performance and prolonging the service life of wet multi-disc friction clutch and lay a theoretical foundation for the design and development of high performance wet multi-disc friction clutch.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類號(hào)】：TH133.4

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