發(fā)布時間：2018-06-08 15:08

  本文選題：無級變速 + 傳動控制　； 參考：《吉林大學》2016年碩士論文

【摘要】：無級變速器(CVT)是一種技術先進的變速器產品,與傳統(tǒng)變速器相比其結構簡單、成本低、能夠充分發(fā)揮發(fā)動機的動力特性,實現(xiàn)動力傳動系統(tǒng)的綜合控制。從變速的平穩(wěn)性以及良好的燃油經濟性這兩項優(yōu)勢來看,無級變速器(CVT)的市場前景十分廣闊。目前,無級變速器大多采用液壓控制系統(tǒng)對錐盤加壓實現(xiàn)變速傳動控制,本文依托企業(yè)委托技術開發(fā)實際項目,提出一種機械式傳功控制機構。該機構通過螺旋機構對錐盤進行加壓,利用伺服電機進行調速,與傳統(tǒng)液壓控制機構相比,能顯著降低汽車油耗,提高變速系統(tǒng)的傳動效率。本文通過對比分析不同傳動形式的變速器,結合機械式CVT傳動控制機構的國內外研究現(xiàn)狀,詳細闡述了鏈式CVT變速傳動系統(tǒng)的主要組成部件與變速原理,針對鏈式CVT的變速系統(tǒng)力學模型,對變速系統(tǒng)的鏈條張力以及錐盤夾緊力受力模型進行了研究和分析。從無級變速傳動系統(tǒng)的設計要求和機電一體化控制的原理出發(fā),提出了行星輪系與微調螺旋機構聯(lián)合控制的傳動控制方案。根據(jù)變速傳動控制機構的設計要求對機械式變速傳動控制機構進行了系統(tǒng)性的設計,同時針對行星輪系中的齒輪進行了參數(shù)化設計。利用ADAMS動力學分析軟件,建立了變速傳動控制機構在三種典型傳動比工況下的動力學仿真模型,研究了不同傳動比工況下變速系統(tǒng)的動力學特性,計算了變速系統(tǒng)的傳動比誤差,分析了系統(tǒng)的傳遞效率。根據(jù)變速系統(tǒng)鏈節(jié)之間的張力、銷軸與錐盤之間的接觸力,分析了變速系統(tǒng)的受力情況。根據(jù)標記鏈節(jié)在特定平面內的運行軌跡,分析了變速傳動過程中鏈條系統(tǒng)的波動情況。利用ANASYS對傳動控制機構中行星輪系進行了靜力學特性分析計算,對行星輪系中的太陽輪與行星齒輪之間的嚙合特性進行了研究,根據(jù)中心輪與行星輪在靜載荷作用下的應力和應變云圖分析了應力應變情況,計算結果表明所設計行星輪系機構滿足其強度與剛度設計要求。本文研究成果為CVT傳動控制系統(tǒng)的設計與分析奠定了重要的理論基礎,對加快我國無級變速器研發(fā)技術的自主化與產業(yè)化進程以及提升我國汽車產品的自主創(chuàng)新能力具有重要的工程指導意義。
[Abstract]:CVT is a kind of technologically advanced transmission product. Compared with traditional transmission, CVT has a simple structure and low cost. It can give full play to the power characteristics of the engine and realize the comprehensive control of the power transmission system. From the point of view of the smoothness of speed change and good fuel economy, the market prospect of CVT (CVT) is very broad. At present, the stepless transmission mostly uses hydraulic control system to realize the variable speed drive control on the conical disc. This paper puts forward a kind of mechanical power transmission control mechanism based on the enterprise entrusting technology to develop the actual project. Compared with the traditional hydraulic control mechanism, this mechanism can significantly reduce the fuel consumption of the automobile and improve the transmission efficiency of the variable speed system. In this paper, the main components and principle of chain CVT transmission system are described in detail by comparing and analyzing the transmission with different transmission forms and combining with the domestic and international research status of mechanical CVT transmission control mechanism. Based on the mechanical model of variable speed system of chain CVT, the model of chain tension and clamping force of tapered disk is studied and analyzed. Based on the design requirements of stepless variable speed transmission system and the principle of electromechanical integrated control, the drive control scheme of planetary gear train and fine adjusting screw mechanism is put forward. According to the design requirements of the variable speed transmission control mechanism, the mechanical transmission control mechanism is systematically designed, and the parameterized design of the gear in the planetary gear train is carried out at the same time. Using Adams dynamic analysis software, the dynamic simulation model of the variable speed transmission control mechanism under three typical transmission ratio conditions is established, and the dynamic characteristics of the variable speed system under different transmission ratio conditions are studied. The transmission ratio error of the variable speed system is calculated and the transmission efficiency of the system is analyzed. According to the tension between the chain joints and the contact force between the pin shaft and the cone disc, the force of the variable speed system is analyzed. The fluctuation of chain system in the process of variable speed transmission is analyzed according to the running track of the marked link in a particular plane. The static characteristics of planetary gear train in transmission control mechanism are analyzed and calculated by ANASYS, and the meshing characteristics between solar gear and planetary gear in planetary gear train are studied. According to the stress and strain cloud diagram of the center gear and the planetary wheel under static load, the stress and strain conditions are analyzed. The calculated results show that the designed planetary gear train meets the design requirements of strength and stiffness. The research results in this paper have laid an important theoretical foundation for the design and analysis of CVT transmission control system. It is of great significance to accelerate the independent development and industrialization of stepless transmission technology in China and to enhance the independent innovation ability of automobile products in China.
【學位授予單位】：吉林大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：U463.2

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本文編號：1996219