提升副箱中间轴齿轮整体位置度精度的研究

发布时间：2018-11-29 11:09

【摘要】：变速器是汽车动力传动系中的关键部件之一,其性能对整车性能具有决定性的影响。由美国伊顿公司上世纪五、六十年代设计的双中间轴结构变速器因其承载能力强、故障率低等特点已成为国内重型卡车匹配的主力箱型,国内多年的使用证明,该类型变速器发生故障的主要由于副箱打齿导致。副箱中间轴总成由一副箱齿轮与一副箱中间轴经压装焊接组合而成,其加工难度主要体现在两齿轮的对齿精度、焊接强度,总成热变形对齿轮齿向及齿距误差的影响等几个方面,其中对齿精度最为关键,如不能正确的实现副箱对齿,齿轮啮合不良会导致齿轮失衡而严重损坏变速箱。本论文以重型卡车变速器副箱中间轴总成为研究对象,针对副箱中间轴齿轮整体位置度精度展开研究,目标解决副箱齿轮打齿问题实现解放卡车的整体性能的提升。具体开展了以下几个方面的研究:1、副箱齿轮打齿现象及影响因素分析。根据市场反馈具体分析打齿现象发生的规律,分析产生的原因及主要影响因素。2、副箱中间轴的压装工艺研究。研究优化副箱中间轴压装夹具的定位夹紧方式,在现有压装夹具的基础上升级提升压装精度,使压装工艺质量稳定。3、副箱中间轴的焊接工艺研究。分析了副箱中间轴采用不同焊接方式方法的工艺特点,研究如何既满足焊接质量要求,同时使焊接后的变形尽量小,并进行了相应的工艺试验。4、副箱中间轴整体位置度精度的提升研究。通过分析压装及焊接后副箱中间轴位置度的变化,经过多轮反复试验,最终得到了位置度变化规律。通过研究,齿轮的传动强度得到提高,避免产品的主要缺陷,可以为用户创造更多的经济效益。本选题的研究,也是对该种“副箱中间轴齿轮压装及焊接”结构的一种总结和探索,可以为更多的研究者提供一些参考和借鉴,从这个层面讲,该选题具有一定的社会效益。
[Abstract]:Transmission is one of the key parts in the automobile power transmission system, and its performance has a decisive effect on the vehicle performance. The dual intermediate shaft transmission designed by Eaton Company in the 1950s and 1960s has become the main box type for the matching of heavy trucks in China because of its strong bearing capacity and low failure rate, and has been proved in China for many years. The failure of this type of transmission is mainly due to secondary box tapping. The secondary box intermediate shaft assembly is composed of a pair of box gears and a pair of box intermediate shafts by pressure welding. The processing difficulty is mainly reflected in the tooth alignment accuracy and welding strength of the two gears. The effect of assembly thermal deformation on gear tooth orientation and gear pitch error is the most critical one. If the secondary box is not realized correctly, poor gear meshing will lead to gear imbalance and serious damage to the gearbox. In this paper, the secondary box intermediate shaft of heavy truck transmission is always taken as the research object, and the overall position accuracy of the secondary box intermediate shaft gear is studied. The goal is to solve the secondary box gear tapping problem to improve the overall performance of the liberation truck. The main contents are as follows: 1. The gear punch phenomenon of accessory box and its influencing factors are analyzed. According to the market feedback, the occurrence law of tooth tapping phenomenon, the causes and the main influencing factors are analyzed. 2, the press packing technology of the intermediate shaft of the auxiliary box is studied. This paper studies and optimizes the positioning and clamping mode of the intermediate shaft press fixture of the auxiliary box, upgrades and promotes the pressure assembly accuracy on the basis of the existing press fixture, and makes the quality of the press packing process stable. 3. Research on the welding technology of the intermediate shaft of the auxiliary box. The characteristics of different welding methods for intermediate shaft of secondary box are analyzed, and how to meet the requirements of welding quality is studied, and the deformation after welding is minimized, and the corresponding technological tests are carried out. Research on the lifting accuracy of the whole position degree of the intermediate shaft of the secondary box. Through the analysis of the change of the position degree of the intermediate shaft of the secondary box after pressing and welding, the law of the change of the degree of position was obtained after repeated tests. Through the research, the transmission strength of the gear is improved, the main defects of the product are avoided, and more economic benefits can be created for the user. The research of this topic is also a summary and exploration of this kind of "intermediate shaft gear pressing and welding" structure, which can provide some reference and reference for more researchers. From this level, this topic has certain social benefits.
【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】：U463.2

【参考文献】