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含CAD图纸、说明书 履带拖拉机无级变速器设计操纵机构设计 拖拉机说明书 履带拖拉机无级变速器设计操纵机构设计CAD图纸 履带拖拉机无级变速器设计 拖拉机cad【 拖拉机变速器 机构 操纵机构

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履带拖拉机无级变速器设计（操纵机构设计）摘 要拖拉机工作条件复杂，外界负荷复杂多变，要求发动机或变速器能适时的改变转矩的大小或转速，以保证拖拉机的动力性和经济性。传统变速箱虽能通过换挡达到一定的要求，但其档位有限，无法实现无级变速。液压机械无级变速器是一种液压功率流与机械功率流并联的新型转动装置，液压机械无级变速器是综合了机械传动高效率和液压传动无级变速两方面优点的新型传动机构。液压机械无级传动是一种多功率流传动系统，它将功率分为液压和机械两路传递即功率分流，分流机构分流后液压马达在正向和反向最大速度之间来回无级变速。其每一个行程和行星齿轮机构的一种工况相配合，最后，两路汇合成由若干无级调速段相衔接并组逐段升高的全程无级输出速度。液压元件只负担最大功率的一部分，其他功率都由机械路传递。这相当于将液压无级变速功率扩大，传动总效率相对于液压传动也显著提高，和液力机械传动相比，装载量最大可提高30%，燃油经济性最大可提高25%。其特点是通过机械传动实现功率转递，通过液压机械相结合实现无级变速。目前，国外先进的拖拉机，工程车辆已经采用液压无级变速器。马达的最高转速对应着该段的末速度，当这段的末速度等于后一段的初速度及后一段初速度对应马达最高转速位置。此液压机械无级变速器必须与发动机合理匹配才能发挥其优势。匹配的关键是根据各种路况和发动机特性调节变速器的传动比，使发动机工作在最佳状态。 关键词：拖拉机，无级变速器，操纵机构DESIGN OF TRACKED TRACTOR VARIABLE CONTINOUSLY TRANSMISSION（CONTROL MECHANISM）ABSTRACTThe working condition of tractor is complicated complex and the external load is ever-changing. The torque of engine or transmission should change with the external load. Although traditional transmission through shifting can reach a certain standard, but its gear is limited and it can not achieve stepless speed. Hydo-mechanical continuously variable transmission (HMCVT) is a power flow of hydraulic and mechanical power flow parallel to the new rotation device , hydraulic machinery CVT is a synthesis of highly efficient mechanical transmission and hydraulic drive CVT merits of the two new drive institutions. Hydro-Mechanical - drive is a multi-stream transmission, power will be divided into two hydraulic and mechanical way that the power transfer streaming streaming agencies triaged hydraulic motor in forward and reverse maximum speed between both CVT. Each of its itinerary and a planetary gear mechanism for a state match, finally, Road converge into two by a number of variable speed converge and the group has to absolutely no higher level of output speed changes. Hydraulic Components burden only part of the maximum power, the other by mechanical power transmission path. This will be the equivalent of continuously variable hydraulic power expansion drive efficiency relative to the total hydraulic transmission has improved significantly. hydraulic and mechanical transmission, the loading capacity can be increased by 30%, fuel economy can be increased 25%. Its characteristics are achieved through mechanical transmission transmit power through the combination of hydraulic machinery to achieve CVT. Currently, foreign advanced tractors, construction vehicles using hydraulic CVT. Motor corresponding to the maximum speed of the speed at the end, When this speed to the end after a period of the early speed and after a period of initial velocity corresponding maximum speed motor position. Matching is the key to all kinds of traffic regulation and the engine characteristics of the transmission ratio transmission, the engine work in the best condition.Key words: tractor, continuously variable transmission, control device 目 录第一章 绪论. . . . . . .1第二章 液压机械无级变速器传递方案的确定.22.1 液压机械无级传动的原理及特点.22.1.1 液压传动原理.22.1.2 液压传动特点.32.2 液压机械无级变速器传递方案的选择.3第三章 液压泵液压马达调速油路的设计.63.1 变量泵与定量马达排量的确定. .63.1.1 变量马达定量泵所组成的油路.63.1.2 补油泵的选择. .83.1.3 液压油及油管的选择.93.2 液压油路压力损失的确定.93.2.1 液压油流动状态的确定.93.2.2 油路沿途压力损失的计算.93.2.3 局部压力损失.103.3 油箱尺寸的确定. 103.4 液压