【正文】 their owncdsvlpa,mxukgf.()ybTqCzjSAX摘 要 目前機械轉(zhuǎn)動應(yīng)用的帶式無級變速器主要是帶傳動無級變速器。廣泛應(yīng)用于機械、石油汽車等行業(yè)。機械、石油行業(yè)多采用橡膠寬 V帶式，自動檔汽車采用金屬帶式無級變速器。無級調(diào)速原理目前主要采用國外技術(shù)專利引進(jìn)的擠壓帶傳動式帶傳動無級變速技術(shù)，調(diào)速擠壓力產(chǎn)生的主要問題：①橡膠 V 帶磨損、熱變形嚴(yán)重，壽命短，承載能力降低；②金屬帶成本高；③調(diào)速時主、從動輪傳動帶不在同一工作平面內(nèi)；④傳動帶承載能力計算超出柔性體傳動的歐拉公式范圍；⑤帶輪槽為曲線形狀，加工成本高，尤其無法在家用電動轎車普遍應(yīng)用等。 通過調(diào)研分析，采用 分體帶輪結(jié)構(gòu)設(shè)計，開發(fā)新型帶傳動無級變速器，使其能滿足家用微型轎 車使用要求，調(diào)速時帶輪分體在調(diào)速機構(gòu)的作用下可以沿徑向連續(xù)膨脹或 收縮，達(dá)到改變帶輪的工作直徑，實現(xiàn)無級變速目的，消除了作用在 V帶側(cè)面的擠壓力帶輪的問題。 畢業(yè)課題論文研究主要完成了以下工作 : 對分體帶輪帶傳動無級變速器的工作原理以及各部分的主要功能分析，說明了新型 V 帶無級變速器可以滿足傳動要求； 結(jié)合設(shè)計參數(shù)的要求，完成了分體帶輪帶傳動無級變速器主要零件 (錐體軸和帶輪分體等 )的結(jié)構(gòu)尺寸設(shè)計； 研究工作取得以下成果 : 創(chuàng)新提出分 體帶輪結(jié)構(gòu)，通過調(diào)速控制機構(gòu)可以改變主從動帶輪的工作直徑，實現(xiàn)連續(xù)無級變速； 結(jié)構(gòu)簡單，成本低，適用性強〔可適應(yīng)普通 V帶、平帶、圓帶、楔型帶無級變速 )； 調(diào)速時消除了作用在傳動帶側(cè)面的擠壓力，減小由此產(chǎn)生的傳動帶的過大磨損等問題； their owncdsvlpa,mxukgf.()ybTqthCzjSAXII 總結(jié)出 分體式 V帶傳動無級變速器的有效圓周力計算方法。 關(guān)鍵詞 ：帶式傳動；無級變速器；分體帶輪 全套圖紙，加 153893706 河南理工大學(xué)萬方科技學(xué)院本科畢業(yè)論 文 their owncdsvlpa,mxukgf.()ybTqCzjSAXIII ABSTRACT The belttype continuously variable transmission (CVT) has been widely used in the mechanics and the fields of petroleum and automobiles nowadays. To be exact, the rubber Vbelt CVT is adopted for the mechanics and petroleum, while the metal CVT is used for automatic automobile. The working principle of CVT is mainly based on the technology of the pressed belt type CVT, which is of abroad technology patent. The main problem involves (1) the likely wear of rubber V belt the serious deformation from heat, the short service life and the reduced capacity of carrying.(2 )the high cost of metal belt.(3 )The main belts and auxiliary belts are not in the same working horizon when regulating speed. (4) The calculation on carrying capacity is beyond the format. (5) The pulley sleeve is in the form of curve, and the cost of production is too high. By careful analysis， The use of the structural design of split pulley， development of new CVT Belt Drive， To enable them to meet their owncdsvlpa,mxukgf.()ybTqthCzjSAXIV the requirements of domestic use of electric cars。 It proves to reduce the wear of belt and avoid misalignment of pulleys to a large extent by adopting the parted pulleys and unique mood to vary speed. The study work has been pleted as follows： 1. It proves that this new type of CVT can meet the driving requirement by analyzing the working principle of CVT with parted pulleys and main functions of each ponent. 2. The dimension of main ponents of CVT with parted pulleys has been designed in fully pliance with the requirement of design parameters. 3. The design plan has been optimized and the best parameters of construction of CVT with parte pulleys has been determined by the stress analysis, with the result that the parted block can change the working diameter by means of moving radially. The following achievement has been made： 1. The parted pulley construction has been designed in the new way. 2. The construction is simple, the cost is low and the application is wide. 3. The pressing force acting on the side of transmission belt is eliminated when regulating speed, hereby, the wear is greatly reduced. 4. Summarized split CVT Vbelt drive of the effective Circumference force method of calculating. 河南理工大學(xué)萬方科技學(xué)院本科畢業(yè)論 文 their owncdsvlpa,mxukgf.()ybTqCzjSAXV Key words: belttype transmission。 continuously variable transmission (CVT)。 parted pul 河南理工大學(xué)萬方科技學(xué)院本科畢業(yè)論 文 their owncdsvlpa,mxukgf.()ybTqCzjSAX 目 錄 前言 ......................................................... 1 1 機械無級變速器的概況 ....................................... 4 分類及應(yīng)用 ........................................... 4 國內(nèi)外研究情況 ....................................... 5 帶式無級變速器的特點及存在的問題 ..................... 7 課程 設(shè)計 內(nèi)容及意義 .................................. 10 設(shè)計任務(wù) ....................................... 10 設(shè)計 內(nèi)容 ....................................... 10 2 小功率微型電動轎車無級變速器工作原理 ...................... 11 方案分析 ............................................ 11 結(jié)構(gòu)組成 ............................................ 11 工作原理 ............................................ 13 主要性能參數(shù) ........................................ 13 傳動比 ......................................... 13 變速比帶 ....................................... 14 滑動率 ......................................... 14 3 分體帶輪及錐體的設(shè)計 ...................................... 15 帶傳動參數(shù)計算 ...................................... 15 錐體及分體設(shè)計 ...................................... 16 帶傳動計算 .......................................... 18 帶輪結(jié)構(gòu) ............................................ 24 4 軸及軸承的設(shè)計 ............................................ 25 軸的初設(shè)計 .......................................... 26 主要軸承選用與校核 .................................. 26 軸向尺寸確定 ........................................ 29 軸的校核 ............................................ 29 按彎扭合成強度條件校核軸的強度 ................. 29 按疲勞強度計算危險截面的安全系數(shù) ............... 32 靜強度安全系數(shù)校核 ............................. 33 their owncdsvlpa,mxukgf.()ybTqthCzjSAXii 軸的剛度校核 ................................... 34 鍵強度校核 .......................................... 37 花鍵強度校核 ................................... 37 輸入輸出平鍵強度校核 ........................... 38 分體式 V 帶傳動無級變速器的有效拉力計算 .............. 39 汽車驅(qū)動力與行駛速度校核 ............................ 42 5 調(diào)速機構(gòu)設(shè)計 .............................................. 44 調(diào)速機構(gòu)綜述 ........................................ 44 液壓機構(gòu)設(shè)計 ........................................ 45 液壓缸的設(shè)計計算 ............................... 46 速度輸出曲線 ................................... 49 結(jié) 論 ...................................................... 50 致 謝 ...................................................... 51 參考文獻(xiàn) .................................................... 52 河