某皮卡车后桥轮胎螺栓断裂问题分析及优化

文章主要通过对某皮卡车后桥轮胎螺栓断裂问题进行分析,找出了螺栓断裂产生的原因和机理,并相应进行了改进设计,最后对改进设计的样件进行了实物验证,证明了改进是有效的。通过本次故障分析和优化设计,也为同类结构的轮胎螺栓设计提供了几个关键控制因素,为解决同类问题提供可供参考的思路。     

三代轮毂轴承车轮螺栓断裂的机理分析

通过对某B级车三代轮毂轴承的车轮螺栓断裂问题进行分析,从材料检测、CAE分析和轴向夹紧力的角度明确问题发生的原因和机理,提出优化方案并通过考核车轮螺栓的整车试验验证。通过本次问题的解决,为同类结构的车轮螺栓断裂问题提供了排查思路和解决方案。     

车轮螺栓断裂分析

通过对某商用车后桥车轮螺栓断裂问题分析,找出了车轮螺栓断裂产生的原因与机理,提出了后期控制该故障发生的有效解决方法。通过本次故障分析,也为同类结构的车轮螺栓断裂问题分析与解决提供了思路。     

紧固件防松扭矩计算分析

根据现有的螺栓连接方式,对螺栓的旋转松动力矩和螺栓预紧力矩进行了假设性计算,对稳定杆吊管螺栓产生旋转松动的原因进行了分析,分析结果表明左右车轮跳动量差值较大时,由于产生的旋转松动力矩大于螺栓预紧力矩造成螺栓松动。文章针对螺栓松动提出了改进方案,对提高稳定杆螺栓连接的稳定性有重要意义。     

某动力总成悬置胶垫螺栓松动的设计改进

螺栓松动作为汽车可靠性问题中的一个难题,经常困扰着汽车设计人员。文章将针对一款动力总成悬置胶垫螺栓松动问题,通过与紧固件厂家技术合作,对螺栓预紧力、安装扭矩和接触面屈服强度进行计算校核。并针对计算发现的悬置支架接触面存在的屈服压溃风险及螺栓预紧力不足等问题,分别制定了相应的整改方案,最终确定了此悬置紧固螺栓的安装扭矩范围,满足悬置胶垫紧固预紧力要求。根据文章计算方法确定的安装扭矩进行定扭后,通过紧固件横向振动试验和越野路路试,动力总成悬置胶垫紧固螺栓未再出现松动现象,可以看出文中螺栓松动计算校核和改进方案有效。文中案例通过对螺栓预紧力、安装扭矩和接触面屈服强度等进行符合性计算校核和改进,为汽车螺栓松动问题整改提供了一个非常好的解决思路和方法。     

轿车运输过程中后桥与车轮联接螺栓松动和断裂的分析

对某轿车后桥与车轮联接螺栓松动和断裂现象进行了动态试验分析，找出其主要原因并提出改进建议。     

车轮螺栓及车轮螺母设计优化

车轮螺栓滑扣、打转、断裂,轮毂滑坑,车轮螺母松退等问题是很多紧固件厂,车桥厂和整车厂所面临的一个很棘手的问题,通过研究分析,经过几方面结构的设计改进及优化,取得了显著的效果。本文通过几个方面的改进,希望给读者提供一定的思路和方法。     

转向机螺栓松动滑移原因解析

某车型的开发过程中,转向机与前副车架连接螺栓在台架试验中,效率试验时,出现了螺栓拧紧轴力低于最小必要轴力,并在滑移试验时,出现了松动滑移现象,本文通过设计计算及试验验证,分析出现松动滑移的原因及给出解决方法,并对解决方案进行实物的验证,快速有效地解决了松动滑移的问题,为后续类似的问题处理及设计提供借鉴和参考。     

振动对高强度螺栓拧紧效果的影响

本文主要介绍了振动对高强度螺栓拧紧效果的影响。文中通过对车轮、连杆等高强度螺栓进行的高频振动、纵向振动等试验数据,总结出振动对螺栓拧紧效果的影响规律,为高强度螺栓的设计以及装配工艺的制订和验证提供了更贴近合理的试验手段和方法。     

商用汽车车轮螺栓强度分析

本文对商用汽车车轮螺栓强度进行了分析计算,为后续新车型的设计开发提供理论依据和设计参考。     

铝合金车轮花键套连接性能研究

对花键套外形设计、花键套表面粗糙度、铝合金车轮铸造工艺方法等方面进行分析研究,找出了影响铝合金车轮花键套连接强度的因素及工艺参数,避免摩托车铝合金车轮在摩托车行驶过程中花键套与铝合金车轮结合部位发生松动、脱落、异响等情况,提高了摩托车铝合金车轮的安全性能。     

Customer loads of two-wheeled vehicles

Customer usage profiles are the most unknown influences in vehicle design targets and they play an important role in durability analysis. This publication presents a customer load acquisition system for two-wheeled vehicles that utilises the vehicle's onboard signals. A road slope estimator was developed to reveal the unknown slope resistance force with the help of a linear Kalman filter. Furthermore, an automated mass estimator was developed to consider the correct vehicle loading. The mass estimation is performed by an extended Kalman filter. Finally, a model-based wheel force calculation was derived, which is based on the superposition of forces calculated from measured onboard signals. The calculated wheel forces were validated by measurements with wheel–load transducers through the comparison of rainflow matrices. The calculated wheel forces correspond with the measured wheel forces in terms of both quality and quantity. The proposed methods can be used to gather field data for improved vehicle design loads.     

某型车驾驶室人机工程分析

本文利用RAMSIS人机工程分析软件对某型车驾驶室进行了人机工程分析,通过RAMSIS人体库建立了满足GB10000-88中第95百分位、第80百分位、第70百分位、第50百分位的男性(年龄:18-25)人体模型,并利用这些模型在RAMSIS中进行了方向盘分析、踏板分析、换挡手柄分析、空间可及性的分析。在分析完成后,对不合理的地方提出修改意见,综合评价后对设计进行修改,并对不足之处进行总结。     

Shape optimization of a torsion beam axle for improving vehicle handling performance

In this study, shape optimization was conducted for a vehicle’s rear suspension torsion beam to improve its dynamic handling performance. To determine the design variables affecting the vehicle roll characteristics, a sensitivity analysis was conducted using the result of a Taguchi experiment with 6 factors in 8 runs. The upper and lower-flange lengths and web thickness of the torsion beam section, as well as the vertical height difference between the inner and outer of torsion beams, were determined as design variables through sensitivity analysis of the opposite wheel travel test for optimization of the torsion beam axle. The Box–Behnken experimental design with 4 factors and 27 runs was performed using the selected design variables and by performing opposite wheel travel analysis according to the experimental design, and the response surface functions of the roll stiffness, roll steer coefficient, roll center height, and mass of the torsion beam were generated. Using these response functions, shape optimization was conducted for the torsion beam of the rear suspension system. Dynamic performance analysis was performed by applying the optimized H-shaped torsion beam to the rear suspension of the vehicle dynamics model, and it was validated that the dynamic response performance of the optimized vehicle was improved.     

Long-term wear and rolling contact fatigue behaviour of a conformal wheel profile designed for large radius curves

There are many reasons to optimise the wheel–rail interface through redesign or maintenance. Minimising wear and rolling contact fatigue (RCF) initiation on wheels and/or rails is often at the forefront of such considerations. This paper covers the design of a conformal wheel profile and its long-term wear and RCF performance to optimise the wheel–rail interface and subsequently reduce the occurrence of surface-initiated RCF on South Africa’s iron ore export line. A comparative study is performed using multibody dynamics simulation together with numerical wheel wear and RCF predictions. The advantages of a conformal wheel profile design are illustrated by evaluating the worn shape and resulting contact conditions of the conformal design. The conformal design has a steadier equivalent conicity progression and a smaller conicity range compared with the current wheel profile design over the wheel’s wear life. The combination of a conformal wheel profile design with 2?mm hollow wear and inadequate adherence to grinding tolerances often result in two-point contact, thereby increasing the probability of RCF initiation. The conformal wheel profile design proved to have wear and potential RCF benefits compared with the current wheel profile design. However, implementation of such a conformal wheel profile must be accompanied by improved rail grinding practices to ensure rail profile compliance.     

浅析轮系设计实例

本文主要是通过对一个发动机附件轮系设计更改实例的分析,总结出一些轮系设计计算方面的关键点。     

车轮设计优化及双轴试验

车轮在不同路况下行驶时会同时受到来自各个方向的载荷,因传统的弯曲和径向疲劳试验结果,每次仅模拟车轮单一方面的承载情况,所以若不加以修正,很难代表车轮真实的服役情形。文章在介绍车轮装配的基础上,分析了车辆直线行驶和转弯2种状态下车轮的混合应力谱,并对能同时给车轮施以侧向和径向组合载荷的双轴试验原理、设备、过程及其结果评定作了详细论述。表明LBF开发的双轴疲劳试验机能用简单的程序模拟测试整个车轮的承载情形,来自实际工况的经验、数字评估与试验验证的整合构成了车轮的设计优化。     

赛车轮毂多功能集成化设计新方法

由于传统制造工艺在复杂曲面和集成化加工的局限性,导致方程式赛车轮毂的多功能集成化一直被制约,以至于传统赛车轮毂总成普遍存在体积硕大、重量大、传动效率低等问题。文章基于集成化设计原则,在保留传统赛车轮毂总成所需功能的前提下,改变赛车外球笼、轮毂、轮辐等的结构以进行集成化设计从而得到多功能集成化赛车轮毂。所获得的集成化赛车轮毂体积重量明显减小且传动效率明显提高,达到了通过集成化以实现轻量化的目标。     

基于ANSYS workbench的车轮疲劳强度分析

车轮是汽车上的重要部件,它承受车身的重力、驱动力、制动力以及汽车转弯时的横向载荷,对汽车的行驶安全性、稳定性和平顺性都有着非常重要的影响。采用有限元分析的方法可以在新产品设计初期分析出车轮的强度和疲劳寿命,大大缩短设计周期。本文以14×5.5J车轮为研究对象,采用三维建模软件pro/E对车轮进行建模,利用有限元分析软件ANsYs worl出ench对车轮弯曲疲劳强度试验进行模拟,得到车轮强度和疲劳寿命的分析结果。     

基于ADAMS／Insight的多连杆后悬架系统优化分析

在对某型轿车多连杆后悬架系统建立ADAMS多体动力学模型基础上,对该悬架系统进行了仿真分析,分析了轮跳对后轮定位参数的影响,并结合ADAMS／Insight模块对该悬架部分硬点的位置进行了DOE优化。优化结果表明,对该悬架系统所做的优化设计是正确有效的,改善了该悬架系统的运动特性。