毕业设计（论文）-352履带拖拉机－滑动齿轮变速箱设计（含全套CAD图纸）.docVIP

摘要 履带式拖拉机行驶速度很低，每次切断动力换挡都会导致拖拉机停车。所以变速器采用直齿滑动齿轮换挡，成本低廉，工作可靠，维修方便。由于拖拉机工作环境变化较大，要求其变速器传动比范围也较大，可采用两对齿轮相啮合的三轴式变速器，有利于扩大传动比。同时，拖拉机要求有动力输出装置，可采用中间轴上置兼做动力输出轴，输入轴和输出轴下置。这样可以省去一根轴，在输入轴常啮合齿轮下侧布置一常啮合齿轮用作溅油齿轮。在拖拉机停车工作时溅油润滑。操纵机构采用传统的手动直接换挡，省去长距离换挡机构。换挡齿轮布置在上方的中间轴上，有利于缩短换挡拔长度，同时在换挡滑轨上设置自锁、互锁装置，以避免变速器工作时脱挡和同时挂上两个挡等操纵失误。一挡、二挡及倒挡扭矩较大，布置在两端靠近支承点处。一挡、倒挡共用一个滑动齿轮。换挡滑动齿轮做成双联齿轮有利于换挡。该变速器所有齿轮均采用模数为4的标准直齿齿轮，有利于生产制造。齿轮与轴联接均采用花键联接，由于不受轴向力，采用成本低廉的深沟球轴承。输出轴受到主减速器小锥齿轮轴向力影响采用一对圆锥滚子轴承支承。该变速器大量采用传统成熟技术，成本低廉，工作可靠同时又能满足设计要求。 关键词： 履带式，拖拉机，变速器，滑动直齿 ABSTRACT The track type tractor driving very low, and cutting off the motive to change to block and will cause tractor parking each time.So the transmission sadoption glide the wheel gear changes to block, the cost is cheap, work dependable, maintain the convenience.Because the tractor work environment variety compare greatly, request it the spreads to move to compare the scope to also compare greatly, can adopt two rightnesses of wheel gears to spread dynamic three stalk type transmission, be advantageous to extension to spread to move the ratio.At the same time, the tractor requests the power output device, can adopt in the center the stalk places and does the power output stalk up, inputting the stalk and outputting the stalk descend place.Can go to a stalk with the province thus, the side arranges a wheel gear to used to splash the oil wheel gear while input the stalk.At the tractor parking the work splash the oil lubrication.Manipulate the traditional hand of the organization adoption moves to change to block directly, the province goes to the long pull to change to block the organization.Change to block the wheel gear to arrange at above of middle stalk up, be advantageous to shorten to change to block to pull out the length, the constitution locks the device from the lock and with each other in changing to block the slippery track at the same time, taking off to block while toing avoid the transmission work and pin up at the same time two block e