一种新型的混凝土搅拌车中空滚道

轻量化设计已成为专用汽车技术及结构改进的一大趋势,也是设计人员孜孜不倦追求的目标.笔者对混凝土搅拌运输车承受载荷大的零部件——滚道,提出了一种全新的轻量化结构设计的改进方案,以达到滚道的轻量化和降低生产成本的目的,同时还可以降低传统滚道开焊等质量问题.     

混凝土搅拌运输车滚道和托轮常见问题及改善措施

通过分析混凝土搅拌运输车常见问题产生的原因,提出了采取改进滚道的材料和制造工艺、优化滚动结构等措施来改善滚道和托轮的工作状况,保证搅拌筒滚道和托轮接触处于最佳状态,从而延长滚道和滚轮的使用寿命,降低搅拌筒滚道和托轮“运动副”的故障。     

一种新型可拆卸式混凝土搅拌运输车的滚道结构

常见的大方量混凝土搅拌运输车筒体与滚道是整体焊接的,因滚道的承载力太大,容易引起滚道异常磨损而造成搅拌筒的整体报废。将混凝土搅拌运输车滚道改为可拆卸式结构后,则可以有效地避免滚道异常磨损后的筒体报废。不仅节约了生产成本,还可以为用户节省了大量的维修费用和维修时间,从而提高了用户的经济效益,得到了市场的认可。     

循环球转向器的转向螺母双圆弧滚道的拉削加工

介绍了利用普通车床拉削加工转向螺母双圆弧滚道的原理,机床调整及工夹具的设计计算。     

太原牌循环球式转向器

我厂从1970年开始设计,试制太原牌循环球式转向器,现在已成批生产。这种转向器的连接件与解放牌载重汽车相同,可以做为这种汽车的配件。太原牌循环球式转向器(图1)由壳体、单圆弧滚道蜗杆、钢球(φ8毫米)、单圆孤滚道螺母、扇形齿轴等零件组成。     

齿条齿扇循环球转向器中螺母滚道设计的几个问题

本文以BJ-130型汽车转向器为例,分析齿条齿扇式循环球转向器螺杆螺母付滚道中的受力状况,阐明滚道与齿条相对位置对受力状况的影响以及合理选择滚道与滚球接触角的方法。     

球笼式等速万向节接触应力分析与计算

球笼式等速万向节是前置前驱动轿车的关键部件之一，其性能和寿命与接触应力密切相关。对球笼式等速万向节的接触应力进行了分析，给出了计算方法，并对某一车型的ＢＪ７５型球笼式等速万向节进行了计算，结果表明内滚道接触应力大于外滚道，内滚道易于磨损。     

客车外摆门研究

分析了客车单扇外摆门的结构，阐明了滚道螺杆，滚道螺母式外摆门泵及与此种门泵相应的外摆门驱动机构的作用原理，介绍了外摆门的优良,性能设计方法，步骤以及设计过程中应注意的问题，并对外摆门摆动机构的运动轨迹，各部件间的间隙关系，外摆门驱动机构的工作过程中的受力状况和各驱动部件间相工作用关系做了一定的研究，同时，总结 了一些生产实践中安装，调试外摆门的经验，教训，探索了合理装配，调整外摆门的程序和方法。     

搭建平台共同促进：探讨“一种新型的双托轮承载结构”

安徽星马汽车股份有限公司程坤 1.双托轮结构支承的优点:与搅拌简滚道的多点接触,相对于单托轮结构支承筒体滚道而言,间距得到了适当的增大,从而提高了搅拌筒的稳定性和改善了筒体的受力状况;单托轮受上装结构限制,若增大间距,简体的后支承座势必增大,结构增大则会使重量增加.     

前轮毂轴承的失效分析

为查找某前轮毂轴承失效的原因,进行了失效形貌观察、腐蚀机理分析和理化检验等工作。通过分析轴承滚道和滚珠的腐蚀特点和磨损特点,得出该轴承零部件的失效原因:即由于密封不严,水或水汽进入轴承内部,造成了腐蚀;腐蚀物质的沉积及点坑的形成,使滚珠与滚道异常接触,造成异响。     

起动机渐开线螺旋花键轴的设计及其冷滚轧技术

汽车用起动机电枢轴上的螺旋花键，已多采用冷滚轧加工的多键渐开线螺旋花键来代替铣削加工的四键或六键的矩形花键。阐述了渐开线螺旋键冷忆使用的新轧轮的特点及应用；指明了渐开线螺旋花键轴几何尺寸设计时应注意的问题。     

轮胎滚动阻力试验系统研究

许多汽车性能试验均在底盘测功机上进行，而轮胎滚动阻力是影确测试精度的重要原因。由于目前我国大多数企业均使用双滚筒式底盘测功机，所以设计双滚筒式测功机上轮胎滚动阻力测试系统，将为台试轮胎滚动阻力特性研究奠定基础。双滚筒式试验台上测试轮胎滚动阻力采用反拖法实现，滚动阻力测试系统由双滚筒式底盘测功机改制而成。通过对加载方式、误差处理方法、系统测试精度等问题的探讨，验证了系统的可靠性和准确性。     

炊事车水路系统结构设计

介绍了炊事车水路系统结构设计时应考虑的问题,并结合多年的产品设计提出新的设计思路供有关人员设计参考。     

Influence of the track quality and of the properties of the wheel–rail rolling contact on vehicle dynamics

This work describes an analytical approach to determine what degree of accuracy is required in the definition of the rail vehicle models used for dynamic simulations. This way it would be possible to know in advance how the results of simulations may be altered due to the existence of errors in the creation of rolling stock models, whilst also identifying their critical parameters. This would make it possible to maximise the time available to enhance dynamic analysis and focus efforts on factors that are strictly necessary. In particular, the parameters related both to the track quality and to the rolling contact were considered in this study. With this aim, a sensitivity analysis was performed to assess their influence on the vehicle dynamic behaviour. To do this, 72 dynamic simulations were performed modifying, one at a time, the track quality, the wheel–rail friction coefficient and the equivalent conicity of both new and worn wheels. Three values were assigned to each parameter, and two wear states were considered for each type of wheel, one for new wheels and another one for reprofiled wheels. After processing the results of these simulations, it was concluded that all the parameters considered show very high influence, though the friction coefficient shows the highest influence. Therefore, it is recommended to undertake any future simulation job with measured track geometry and track irregularities, measured wheel profiles and normative values of the wheel–rail friction coefficient.     

CT双扩方舱车总体设计

介绍了一款CT双扩方舱车的设计思路和方法,介绍了方舱内外部布置及总体结构设计,特别介绍了控制间X射线防护铅板的厚度设计、控制间壁板的布置及警示灯的安装,最后对该车进行了安全性校核.经出厂前各项试验检测,产品各项技术指标均较好.     

优选法在汽车齿轮辗扩工艺试验中的应用

分析了ＥＱ１４０型汽车差速器从动齿轮锻件辗扩变形特点和辗扩用毛坯设计中的主要问题，阐明了辗扩用毛坯优选法设计的原理和计算过程，应用优选法指导ＥＱ１４０型汽车差速器从动齿轮扩工艺试验，可使试验次数大为减少。     

Dynamic Train-Track Interaction: Variability Attributable to Scatter in the Track Properties

A numerical method to simulate vertical dynamic interaction between a rolling train and a railway track has been used to investigate the influence of stochastic properties of the track structure. A perturbation technique has been used to investigate the influence of the scatter in selected track properties. The train-track interaction problem has been numerically solved by use of an extended state-space vector approach in conjunction with a complex modal superposition for the whole track structure. All numerical simulations have been carried out in the time-domain with a moving mass model. Properties such as rail pad stiffness, ballast stiffness, dynamic ballast-subgrade mass and sleeper spacing have been studied. To obtain sufficient statistical information from track structures, full-scale measurements in the field and laboratory measurements have been carried out. The influence of scatter in the track properties on the maximum contact force between the rail and the wheel, the maximum magnitude of the vertical wheelset acceleration, and the maximum sleeper displacement have been studied. Mean values and standard deviations of these quantities have been calculated. The effects of the variation of the investigated track properties are discussed.     

Dynamic Train-Track Interaction: Variability Attributable to Scatter in the Track Properties

A numerical method to simulate vertical dynamic interaction between a rolling train and a railway track has been used to investigate the influence of stochastic properties of the track structure. A perturbation technique has been used to investigate the influence of the scatter in selected track properties. The train-track interaction problem has been numerically solved by use of an extended state-space vector approach in conjunction with a complex modal superposition for the whole track structure. All numerical simulations have been carried out in the time-domain with a moving mass model. Properties such as rail pad stiffness, ballast stiffness, dynamic ballast-subgrade mass and sleeper spacing have been studied. To obtain sufficient statistical information from track structures, full-scale measurements in the field and laboratory measurements have been carried out. The influence of scatter in the track properties on the maximum contact force between the rail and the wheel, the maximum magnitude of the vertical wheelset acceleration, and the maximum sleeper displacement have been studied. Mean values and standard deviations of these quantities have been calculated. The effects of the variation of the investigated track properties are discussed.