机械5

多功能小型拖拉机变速器设计 摘要 拖拉机变速箱要求有足够的排挡数，各档的传动比应与要求的传动速度相适应，使拖拉机有较高的生产率和经济性。要有空档便于停车；换挡方便，并能防止同时挂档两档，防止自行挂档和自行脱档；而且结构越简单越好。 本文阐述了拖拉机变速箱的齿轮、轴等零件的设计与校核。本设计利用4×2的换挡方式实现速度的改变。针对平面出图问题，我利用Solid Edge建模在投影的设计思想，直接形象的看到变速箱的模型。把计算出的所需参数，如齿轮中心距、齿轮齿宽、轴长度和直径等数据就可以画出零件的基本造型。再将所有零件立体图进行装配就可以得到变速箱的立体图形，将其进行平面视图投影，就可以得到装配图的基本造型。 该拖拉机的行驶参数如下：最低速度为2.12km/h的爬行档或最高速度为28.12km/h的高速运输档（8+2），供选装。爬行档装置，速度0.41-1.36km/h。这里爬行档为2档，爬行机构设置在副变速箱中，并用离合器改变爬行与正常行驶的切换。倒档是通过惰性齿轮改变轴的转动方向实现的。 关键词：拖拉机；变速箱；设计 Abstract Tractor tra
nsmissio
n requires a
number of stalls e
nough, tra
nsmissio
n gear ratio should be matched with the tra
nsmissio
n speed requireme
nts, the tractor has higher productivity a
nd eco
nomy. To take co
nve
nie
nt parki
ng; shift easily, a
nd ca
n preve
nt the gear two gear, preve
nt to gear a
nd to slip; a
nd the more simple structure a
nd better. This paper describes the desig
n a
nd checki
ng of tractor tra
nsmissio
n gear, shaft a
nd other parts of the. This desig
n usi
ng 4 × 2 shift mode to realize the speed cha
nge. The pla
ne drawi
ng problems, we propose Solid Edge modeli
ng usi
ng the desig
n thought of projectio
n, a
nd see tra
nsmissio
n model is the direct image. The required parameters are calculated, such as gear ce
nter dista
nce, tooth width of gear, shaft le
ngth a
nd diameter data ca
n draw the basic shape of parts. The
n all parts stereogram assembly ca
n get three-dime
nsio
nal graphics gearbox, the pla
ne view, you ca
n get the basic shape of the assembly drawi
ng. The ru
n
ni
ng parameters of the tractor: mi
nimum speed for high-speed tra
nsport docume
nt crawli
ng file 2.12km/h or a top speed of 28.12km/h (8+2), for the optio
nal. Crawli
ng gear device is speedi
ng of 0.41-1.36km/h. Here the creeper gear 2 gear, crawli
ng mecha
nism is arra
nged o
n the accessory gearbox, clutch switch a
nd cha
nge the crawl a
nd the
normal ru
n
ni
ng of. Reverse the directio
n of rotatio
n is realized by i
nert gear cha
nge shaft Keywords: Tractor Gearbox; Solid; desig
n 目录 第一章绪论……………………………………………………………………………1 第二章拖拉机变速箱设计要求和步骤…………………………………………2 2.1对变速箱的要求………………………………………………………………………2 2.2变速箱的设计步骤……………………………………………………………………2 2.3变速箱的分类…………………………………………………………………………3 第三章齿轮的设计和计算校核……………………………………………………4 3.1齿轮传动的主要特点…………………………………………………………………4 3.2齿轮的设计准则………………………………………………………………………4 3.3齿轮的数据确定及其校核……………………………………………………………4 3.3.1齿轮的数据…………………………………………………………………………4 3.3.2齿面接触强度的校核………………………………………………………………5 3.3.3齿根弯曲强度的校核………………………………………………………………5 第四章轴的设计和计算校核………………………………………………………7 4.1轴的设计………………………………………………………………………………7 4.2轴的参数设定与校核…………………………………………………………………7 4.2.1轴TLJ01-01-1的参数………………………………………………………………7 4.2.2轴TLJ01-01-1上的载荷分析………………………………………………………8 4.2.3按弯曲合成应力校核轴的强度……………………………………………………8 4.2.4精确校核轴的疲劳强度……………………………………………………………8 第五章滚动轴承、花键计算校核…………………………………………………11 5.1滚动轴承的校合………………………………………………………………………11 5.1.1求两轴承的径向载荷Fr1和Fr……………………………………………………11 5.1.2两轴承的计算轴向力Fa1和Fa2……………………………………………………11 5.1.3轴承当量载荷P1和P2………………………………………………………………11 5.1.4验算轴承寿命………………………………………………………………………12 5.2花键联接的类型、特点和应用………………………………………………………12 5.3具体参数用……………………………………………………………………………12 5.4花键的校核……………………………………………………………………………13 结束语……………………………………………………………………………………14 致谢………………………………………………………………………………………15 参考文献…………………………………………………………………………………16