549 橡膠履帶拖拉機變速器改進設(shè)計（有cad圖）,549,橡膠履帶拖拉機變速器改進設(shè)計（有cad圖）,橡膠,履帶,拖拉機,變速器,改進,改良,設(shè)計,cad 摘 要 本文詳細介紹了本次設(shè)計的主要內(nèi)容、設(shè)計方法、設(shè)計理念、設(shè)計思路及設(shè)計心得體會等與設(shè)計有關(guān)的方方面面！首先，分析了當(dāng)今國內(nèi)外重型車變速器的發(fā)展現(xiàn)狀、發(fā)展趨勢及本次設(shè)計采用的方案----雙中間軸式多檔變速器！雙中間軸設(shè)計先進，結(jié)構(gòu)獨特，動力從輸入軸輸入，然后分流至兩個中間軸，最后匯集于主軸輸出，然后分流至兩個中間軸，最后匯集于主軸輸出，實現(xiàn)了箱體內(nèi)部的功率分流，從而使變速器內(nèi)每個中間軸及每個齒輪上的載荷減半，大大改善了齒輪軸承和箱體的受力情況，與單中間軸變速器相比，雙中間軸變速器受路況，載荷和運能等因素影響要小一些，更適合中國國情。在設(shè)計過程中盡力做到有理有據(jù)，確定方案之后對整車的動力性和燃油經(jīng)濟性進行了簡化計算及評定。接著進行了變速器檔數(shù)、主減速器傳動比、各檔傳動比及齒輪幾何參數(shù)的確定。接下來布置草圖和變速器總裝配圖，軸的尺寸確定、換檔機構(gòu)的布置等。對主箱中間軸、主軸進行了強度及剛度的校核計算。而后對每對齒輪進行了彎曲應(yīng)力和接觸應(yīng)力的計算！本次設(shè)計在設(shè)計方法上充分運用了計算機技術(shù)、機械類設(shè)計手冊、設(shè)計軟件。設(shè)計思想上秉著：好造、好用、好看的原則，盡力使各零件標(biāo)準(zhǔn)化、系列化、通用化！從而滿足變速器產(chǎn)品的系列化設(shè)計。從國內(nèi)重型汽車變速器市場容量來看，有三分之一的產(chǎn)品來自進口，而另外三分之二的產(chǎn)品中有80%以上源自國外技術(shù)，國內(nèi)自主開發(fā)的重型汽車變速器產(chǎn)品銷量很小，從而說明國內(nèi)重型汽車變速器廠家的自主開發(fā)能力仍然很薄弱，應(yīng)對整車新車型配套產(chǎn)品的能力遠遠不夠。為此本次設(shè)計的變速器主要是針對重型車而設(shè)計，根據(jù)當(dāng)前的市場供求情況本類型變速器有著廣闊的市場前景！ 關(guān)鍵詞： 雙中間軸 ，強度計算，齒輪應(yīng)力，變速器 ABSTRACT This paper describes the design of the current content, design methods, design concept, design ideas and design experience-such as design-related aspects. First, theanalysis of today's heavy-duty truck transmission of the current state of development trends and the current design of the program - the-middle Cylindrical Roller Bearings Transmission! Middle-axis advanced design, unique structure, dynamic input from the input shaft, and then diverted to the two intermediate shafts. Survey spindle in the final output, and then diverted to the two middle axis, in the final pool spindle output achieved a box within the power split, so that each intermediate transmission shaft and the gear each load half, greatly improved bearings and gear box by the edge of the intermediate shaft and single transmission than double by the middle axle transmission traffic. load and can be transported to the impact of factors such as smaller, more suitable for China's national conditions. In the process of designing the legislature should do its best, determining program on the vehicle after the power and fuel economy for a simplified calculation and assessment. Then a few stalls transmission, the transmission ratio main reducer, the stalls and gear transmission ratio of the geometric parameters determined. Next Layout Plan and the total transmission assembly, the axis to determine the size, shifting the layout. Box in the main intermediate shaft, spindle, and the Deputy boxes of the intermediate shaft strength and stiffness is calculated. Then right gear for each of the bending stress and contact stress calculation! The design methods in the design of the full use of computer technology, mechanical design manual design software. Ideologically animated design: create good, useful, interesting, try to make the various parts standardization, serialization, and generalized! Transmission products to meet