边界元法在汽车变速器齿轮弯曲问题中的应用

本文首先建立了汽车变速器齿轮弯曲分析的数学模型,并利用边界元理论,建立了相应的边界元模型;最后用该模型对某轻型车变速器齿轮的弯曲问题进行了分析计算。从而为分析和模拟汽车变速器齿轮弯曲问题提供了一种新方法。     

日野ZM440型汽车变速器副轴的损坏与修复

从失效分析人手，探讨了日野ZM440型15吨载货汽车变速器副轴损坏修复的堆焊工艺，提出了齿轮内孔修复及变速轴弯曲矫正的方法。     

汽车变速器齿轮故障的定量诊断研究

基于振动监测技术，以不解体汽车变速器为前提，探讨了倒谱分析机理。根据理论分析，倒谱值大小可以作为定量诊断汽车变速器齿轮故障的参量。通过汽车变速器台架模拟故障试验分析，得出用倒谱诊断汽车变速器齿轮故障的阈值。理论分析与试验结果一致。     

基于EMD和AR模型的汽车变速器齿轮故障诊断方法

提出了基于EMD和AR模型的汽车变速器齿轮故障诊断方法。该方法采用EMD将齿轮振动信号分解成若干个平稳的IMF分量,对每一个IMF分量建立AR模型,以模型的自回归参数和残差的方差作为特征向量建立Mahalanobis。距离判别函数,进而识别齿轮的工作状态。实验分析表明,该方法能有效地应用于变速器齿轮的故障诊断。     

关于齿轮振动,噪声与齿轮修形关系的探讨

对汽车变速器的振动和噪声的研究表明，主要的激振源和噪声源是传动齿轮的啮合冲击，而齿轮修形技术能有效地降低了汽车变速器齿轮的传动噪声，它可提高齿轮传动质量，探讨了某汽车变速器齿轮修形参数的求解过程，并为汽车齿轮修形规范的制订提供了一定依据。     

变速器可靠性优化设计

论述了变速器可靠性优化设计的必要性，建立了变速器系统可靠性分配模型，提出了变速器齿轮传动可靠性优化设计的方法和数学模型，并进行了实例分析计算。     

汽车变速器齿轮制造缺陷的声频特征提取

汽车变速器齿轮制造缺陷声频特征的提取，是汽车变速器噪声声故障诊断专家系统准确诊断齿制造缺陷的关键。本文通过齿轮制造缺陷噪声分类测试实验，从齿轮制造缺陷的噪声差谱，分析提出了齿轮制造缺陷的声频特征。     

修形珩齿新工艺

1国内外齿轮加工现状 1．1国外 降低汽车变速器齿轮传动噪声，一直是汽车变速器行业的主攻对象。世界上大多数国家，特别是发达国家对汽车变速器规定了严格的噪声标准。为了降低噪声，汽车齿轮行业从设计和制造两方面做了大量工作。其中在制造方面，齿轮加工工艺的不断改进和制造精度的不断提高，使变速器齿轮传动噪声降低很多。上世纪80年代以来，国外很多汽车齿轮行业，将原有的滚、剃工艺和滚、     

六安江淮汽车齿轮制造有限公司

六安江淮汽车齿轮制造有限公司（原安徽省汽车齿轮箱总厂）是安徽江淮汽车集团核心企业之一，具有22011.38万元。公司有较高的汽车变速器总成及零部件加工能力和先进的检测计量手段。拥有高效数控齿轮加工、热处理连续渗碳自动线、变速器壳盖生产线、总成装配线等主计量理化中心、齿轮检测中心并配备有三坐标检测机、数控齿轮测量中心等国际领先的检测设备。主要产品有LC5T97、6800系列客六安江淮汽车齿轮制造有限公司     

汽车变速器焊接修复工艺

<正>随着国民经济的发展及人民生活水平的不断提高，汽车已成为主要的代步工具，汽车变速器是汽车传动系的重要部件之一，汽车在行驶过程中由于路面颠簸、交通事故、金属疲劳等原因易造成变速器壳体及齿轮损坏。变速器壳体为铝合金材质，变速器齿轮为20CrMnTi渗碳钢材质，修配厂经过多年的攻关和经验积累，掌握了汽车铝合金变速器壳体及齿轮的焊接修复技术。     

平地机后桥齿轮的有限元仿真与失效分析

利用Pro/E软件构建了PY160平地机后桥齿轮的精确模型,并进行装配.将简化后的装配模型导入ANSYS软件中,建立起非线性接触分析的有限元模型.通过有限元分析,得出后桥输出齿轮齿根最大弯曲应力、轮齿最大接触应力和轮齿在多个啮合位置的应力分布云图,在此基础上对齿轮失效原因进行分析,结果可为齿轮的寿命预估提供参考.     

A locomotive–track coupled vertical dynamics model with gear transmissions

A gear transmission system is a key element in a locomotive for the transmission of traction or braking forces between the motor and the wheel–rail interface. Its dynamic performance has a direct effect on the operational reliability of the locomotive and its components. This paper proposes a comprehensive locomotive–track coupled vertical dynamics model, in which the locomotive is driven by axle-hung motors. In this coupled dynamics model, the dynamic interactions between the gear transmission system and the other components, e.g. motor and wheelset, are considered based on the detailed analysis of its structural properties and working mechanism. Thus, the mechanical transmission system for power delivery from the motor to the wheelset via gear transmission is coupled with a traditional locomotive–track dynamics system via the wheel–rail contact interface and the gear mesh interface. This developed dynamics model enables investigations of the dynamic performance of the entire dynamics system under the excitations from the wheel–rail contact interface and/or the gear mesh interface. Dynamic interactions are demonstrated by numerical simulations using this dynamics model. The results indicate that both of the excitations from the wheel–rail contact interface and the gear mesh interface have a significant effect on the dynamic responses of the components in this coupled dynamics system.     

基于应力测试技术的重型车变速器齿轮失效研究

针对某重型车变速器齿轮的失效问题,利用应力测试技术对易产生弯曲疲劳失效的齿轮进行了应力测试,并通过与有限元计算结果的比较,论述了有限元计算结果的局限性。根据测试结果,从齿根过渡圆角和基节偏差的角度分析了变速器齿轮的失效原因,提出了增大主动齿轮刀具刀顶圆角半径及对基节误差进行控制的改进措施,并通过台架试验进行了验证。     

齿向修形CAD／CAM闭环系统的理论分析

为了减少汽车变速齿轮的载荷集中，提高齿轮副的承载能力和延长其使用寿命，提出并研制了齿向修形的CAD／CAM闭环系统，有效地解决了修形曲线中心可任意偏离齿宽中点和修型精度问题。该系统已装在Y4232C型剃齿机上使用，效果良好。     

汽车齿轮齿条式转向器变速比传动的研究

对汽车转向系杆系的力学特性进行了分析，指出了齿轮齿条式转向器采用定速比传动的缺点及采用变速比传动的必要性。讨论了手动及动力转向器变速比曲线的选择原则及方法。剖析了国外为夏利轿车转向器设计的速比曲线，给出了其解析表达式。     

Dynamic analysis of spiral bevel geared rotor systems applying finite elements and enhanced lumped parameters

The dynamics of spiral bevel gears like most high-speed precision gears employed in motor vehicles and off highway equipments are substantially affected by the structural characteristics of the shafts and bearings. The lumped parameter model is one of the common tools applied to perform gear dynamic analysis. Even though the lumped parameter approach is computationally fast and conveniently efficient, it typically uses limited number of coordinates and may not fully account for the shaft-bearing structural characteristics accurately. In this analysis, the finite element formulation, that can generally represent more complete characteristics of the shaft-bearing assembly, is employed to enhance the current lumped parameter synthesis theory using the concept of effective mass and inertia elements. Computational output shows that the enhanced lumped parameter synthesis model is capable of predicting sufficiently accurate dynamic response when compared to the direct dynamic finite element calculations, and much more precise response than previous lumped parameter results, especially when the gear dynamics are associated with the pinion or gear bending modes. Even though this analysis focuses primarily on the spiral bevel geared rotor systems, the proposed methodology and analysis results can be easily extended to other types of gears.     

Locomotive dynamic performance under traction/braking conditions considering effect of gear transmissions

Traction or braking operations are usually applied to trains or locomotives for acceleration, speed adjustment, and stopping. During these operations, gear transmission equipment plays a very significant role in the delivery of traction or electrical braking power. Failures of the gear transmissions are likely to cause power loses and even threaten the operation safety of the train. Its dynamic performance is closely related to the normal operation and service safety of the entire train, especially under some emergency braking conditions. In this paper, a locomotive–track coupled vertical–longitudinal dynamics model is employed with considering the dynamic action from the gear transmissions. This dynamics model enables the detailed analysis and more practical simulation on the characteristics of power transmission path, namely motor–gear transmission–wheelset–longitudinal motion of locomotive, especially for traction or braking conditions. Multi-excitation sources, such as time-varying mesh stiffness and nonlinear wheel–rail contact excitations, are considered in this study. This dynamics model is then validated by comparing the simulated results with the experimental test results under braking conditions. The calculated results indicate that involvement of gear transmission could reveal the load reduction of the wheelset due to transmitted forces. Vibrations of the wheelset and the motor are dominated by variation of the gear dynamic mesh forces in the low speed range and by rail geometric irregularity in the higher speed range. Rail vertical geometric irregularity could also cause wheelset longitudinal vibrations, and do modulations to the gear dynamic mesh forces. Besides, the hauling weight has little effect on the locomotive vibrations and the dynamic mesh forces of the gear transmissions for both traction and braking conditions under the same running speed.     

Prediction of vibrating forces on meshing gears for a gear rattle using a new multi-body dynamic model

An efficient multibody dynamic model was developed to predict the vibrating transmitted gear forces of loaded and unloaded pairs of helical gears simultaneously at all speeds. The model can also calculate the bearing forces of a manual transmission that, in turn, may be converted to rattling noises. The bending of meshing gear teeth and torsional flexibility of transmission shafts were considered and embodied effectively in the multibody dynamic model by calculating the tooth bending stiffness and adding a torsion spring on a shaft section between two gears, respectively. The reactive forces on teeth and bearings were calculated and compared using three different models that were developed for this study — an equivalent model, a rigid-body model, and a frequency-based model. The equivalent model took only 58% computation time, compared to the frequency-based method, even though the two showed very similar results.     

电动车两档变速器设计开发

设计了一款电动车用变速器,对驱动电机进行参数匹配设计。依据整车动力性和经济性的要求,对传动系统的速比进行了优化设计,制定了以电机高效运行为原则的换挡控制策略,并与采用固定速比减速器的电动汽车进行了对比验证试验,整车的能耗降低了6%,续驶里程延长了7%。