拖拉机动力输出机构故障分析及基于有限元的结构改进
发布时间：2018-07-25 12:25
【摘要】：拖拉机在我国农业生产中有着举足轻重的作用,除在农业生产中提供牵引力外,还主要通过动力输出机构来实现配套机械的农业机械化。动力输出机构的损坏直接导致拖拉机不能正常使用,给农业生产带来不利影响。因此,随着拖拉机用途的不断延伸,提高动力输出机构的承载能力,快速分析拖拉机在实际使用中的故障原因,提出改进方案,并通过有效手段验证改进效果就显得很有必要,从而可避免批量质量事故的产生,降低企业损失。本文在理论分析和金相检验的基础上,系统性归纳出动力输出机构的损坏形式,采用金相、经验等常规失效分析手段找到了动力输出机构相关零件的失效原因,逐一提出控制措施。其中重点研究了动力输出壳体挡圈卡槽结构失效的原因,根据动力输出机构的结构和零件相互干涉磨损的损坏形式,确定轴向力是导致了动力输出壳体失效的主要原因。结合国家标准和实际使用情况,创新性的采用有限元分析的方法,对技术中心改进前和改进后的结构进行有限元分析,并将分析结果与实际损坏零件进行对比,确认有限元建模的正确性,进而发现原挡圈卡槽结构承受轴向力的能力难以达到国家标准规定的要求。经与其他拖拉机动力输出的结构进行对比,结合该动力输出机构的特点,提出台阶承受轴向力的改进方案。该改进方案的涉及更改零件少,加工容易实现,且装配方案与原装配基本相同,企业投入低,并经过有限元分析,验证了该改进方案是可行和可靠的。
[Abstract]:Tractors play an important role in agricultural production in China. In addition to providing traction in agricultural production, agricultural mechanization of supporting machinery is mainly realized by means of power output mechanism. The damage of the power output mechanism directly causes the tractor not to be used normally, and brings the adverse effect to the agricultural production. Therefore, with the extension of tractor application, it is necessary to improve the bearing capacity of the power output mechanism, analyze the causes of the failure of the tractor in practical use, put forward the improvement scheme, and verify the effect of the improvement by effective means. Thus, the accident of batch quality can be avoided and the loss of enterprises can be reduced. On the basis of theoretical analysis and metallographic examination, this paper systematically induces the damage form of power output mechanism, and finds out the failure reason of relevant parts of power output mechanism by means of conventional failure analysis, such as metallography and experience. Put forward control measures one by one. According to the structure of the power output mechanism and the damage form of the interference wear of the parts, the axial force is the main cause of the failure of the dynamic output shell. Combining with the national standard and the actual application, the finite element analysis method is used to analyze the structure before and after the improvement of the technical center, and the results are compared with the actual damaged parts. The correctness of finite element modeling is confirmed, and it is found that the ability of the original retaining ring clamped groove structure to bear axial force is difficult to meet the requirements of the national standard. By comparing with other tractor power output structures and combining the characteristics of the power output mechanism, an improved scheme of step bearing axial force is put forward. The improvement scheme involves fewer parts changed, easy to be processed, and the assembly scheme is basically the same as the original assembly, and the enterprise investment is low. Through finite element analysis, it is proved that the improved scheme is feasible and reliable.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：S219.03
本文编号：2143811
[Abstract]:Tractors play an important role in agricultural production in China. In addition to providing traction in agricultural production, agricultural mechanization of supporting machinery is mainly realized by means of power output mechanism. The damage of the power output mechanism directly causes the tractor not to be used normally, and brings the adverse effect to the agricultural production. Therefore, with the extension of tractor application, it is necessary to improve the bearing capacity of the power output mechanism, analyze the causes of the failure of the tractor in practical use, put forward the improvement scheme, and verify the effect of the improvement by effective means. Thus, the accident of batch quality can be avoided and the loss of enterprises can be reduced. On the basis of theoretical analysis and metallographic examination, this paper systematically induces the damage form of power output mechanism, and finds out the failure reason of relevant parts of power output mechanism by means of conventional failure analysis, such as metallography and experience. Put forward control measures one by one. According to the structure of the power output mechanism and the damage form of the interference wear of the parts, the axial force is the main cause of the failure of the dynamic output shell. Combining with the national standard and the actual application, the finite element analysis method is used to analyze the structure before and after the improvement of the technical center, and the results are compared with the actual damaged parts. The correctness of finite element modeling is confirmed, and it is found that the ability of the original retaining ring clamped groove structure to bear axial force is difficult to meet the requirements of the national standard. By comparing with other tractor power output structures and combining the characteristics of the power output mechanism, an improved scheme of step bearing axial force is put forward. The improvement scheme involves fewer parts changed, easy to be processed, and the assembly scheme is basically the same as the original assembly, and the enterprise investment is low. Through finite element analysis, it is proved that the improved scheme is feasible and reliable.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：S219.03
【参考文献】
相关期刊论文 前4条
1 李尚平;叶才福;张彪;杨代云;罗春周;;甘蔗收获机分动箱传动轴失效的有限元分析[J];装备制造技术;2016年07期
2 吕嫣;;750拖拉机动力输出轴断裂分析及解决措施[J];装备制造技术;2015年07期
3 王天哲;张刚;梁松;张义民;;深沟球轴承径向载荷分布与刚度参数的研究[J];机械设计与制造;2013年09期
4 李怀刚;;拖拉机分体式动力输出轴改进设计[J];农业机械;2008年31期
，本文编号：2143811
本文链接：https://www.wllwen.com/kejilunwen/qiche/2143811.html
