静液压装载机驱动桥支承轴承疲劳寿命分析

利用RomaxDesigner软件建立了静液压装载机驱动桥齿轮传动系统虚拟样机,采用IS0281和Romax Adjusted轴承疲劳寿命预测方法,对滚动轴承疲劳寿命进行了预测分析。结果表明,各支承轴承的寿命较长,损伤较低,可满足工作要求,这为静液压装载机驱动桥的进一步分析、优化提供了参考。     

工程机械传动系节能技术的研究与应用——山推倾力打造传动系统节能全面解决方案

工程机械传动系统主要分为机械传动、液力传动、静液压传动、电传动。山推工程机械股份有限公司传动分公司产品覆盖液力变矩器、变速箱、驱动桥、减速机等传动零部件,通过资源优化整合,整机匹配优化为用户提供高效、节油、性能可靠的工程机械传动方案。经过实际测试并经优化设计固化后的一套5吨装载机节能传动系统,开发了低转速大能容的液力变矩器,较原5吨装载机传动系节油超过11%,具有良好的经济效益和社会效益。     

装载机行走静液压传动系统特性仿真与试验研究

静液压传动装置已被逐渐用于装载机的行走系统中,是由液压泵和液压马达组成的闭式液压传动系统。该文分析了装载机静液压传动系统的组成及工作原理,针对某4吨装载机研究了一种单泵-双马达行走静液传动系统。在AMESim环境下建立仿真模型,分析了静液压传动系统的特性。此外,还提出了一种针对单泵-双马达静液传动系统的变量调节规律,并将该规律在已经构建模型的基础上进行了仿真模拟。进行了某4吨装载机牵引特性试验,将仿真结果与整机试验进行对比,从而验证了静液传动系统仿真和变量调节规律的正确性。     

静液压传动轮式装载机发展概况

静液压传动轮式装载机的技术发展及优越性由液压泵和液压马达组成的容积调速系统，可通过改变泵或马达的排量来调节马达的转速或扭矩。这种系统又称静液压传动系统。轮式装载机采用这种传动系统后，可以无级调速，而且调速范围宽；没有溢流和节流的能量损失；系统不易发热...     

静液压传动装载机

李志勇：我们今天谈论的话题是静液压传动装载机。从技术角度分析也可,从市场角度分析也可,国内外的情况都可涉及。至于最后,未必就要得出一个结论。最早开发研制出静液压传动装载机的是利勃海尔公司,随后卡特彼勒等公司也开始了这项工作。目前国内天工工程机械有限公司和辽宁利勃海尔装载机有限公司也开始组装生产静液压传动装载机。不过国内市场和用户并未对此达成共识,甚至还存在一些误解。王长江：我觉得这个选题不错。目前王意先生和波克兰公司正在开辟静液压传动市场,力士乐公司也花费了相当的精力开拓静液压传动在国内装载机和…     

车辆差速静液传动系统应用特性分析

车辆差速静液传动系统是由车辆机械传动和静液压传动组成 ,液压定量泵和定量马达构成的静液压传动实现传动系统的无级变速和双向驱动 ,它可使车辆系统获得最佳的工作效率和在车辆零速度时提供较好的起动转矩特性。文中介绍了车辆差速静液传动系统的主要结构 ,对工作原理和工作特性进行了分析 ,探讨差速静液传动系统在车辆传动系统的应用前景     

装载机驱动桥行星齿轮架磨损原因及改进措施

<正>1.故障现象某5t轮式装载机在使用过程中出现驱动桥轮边减速器异常发热现象。拆解检查后发现,齿轮传动系统运转良好,磨损量不大,但是轮边减速器的行星齿轮架磨损严重,行星齿轮侧面的垫片已完全陷入行星齿轮架内。齿轮油变质发黑,行星齿轮架磨损情况如图1所示。2.行星齿轮架结构该装载机采用整体式驱动桥,具有2级减速装置。驱动桥中间为采用圆锥齿轮主减速器,主减速器内设有采用圆锥齿轮的差速器。轮边减速器采用直齿行星齿轮减速器。该驱动桥具有结构     

平地机静液压传动系统的匹配与仿真分析

通过分析平地机静液压传动系统的组成及工作原理,建立了反映系统性能与传动原件参数的数学模型,并基于MATLAB/Simulink软件对某型平地机进行了实际工况下的模拟仿真,结果表明静液压传动能够适应车辆的工作要求,仿真模型可用来快速准确分析静液压传动系统的匹配性能。     

轮式装载机静压传动与液力传动的性能分析与比较

装载机按动力传动系统的不同分为机械式传动、液力机械传动、液压传动和电传动4种类型。该文对装载机的液力传动和静压传动从传动装置的结构形式、操纵和控制性能、转矩传递性能、调速准确性及刚度、多装置系统的匹配性、传动性能与效率、制造成本等几个方面分别进行了分析，通过比较，得出了静压传动系统相对于采用液力机械动压传动的一些优点，指出装载机传动系统开始向高技术、大型化、采用静压传动的趋势发展。     

静液压传动叉车述评

叉车类机动工业车辆的燃油消耗、噪声及作业生产率是设计传动系统时最重要的技术特性。内燃平衡重叉车传动系统通常有机械传动、液力传动及静液压传动三种类型,其中,静液压传动具有优异的性能。以德国林德（Linde）公司为代表的静液压传动叉车是目前国内外堪称一流的产品,但因其生产成本居高不下,一直难以普及应用。近年来逐渐推行的开式静液压传动系统,是一种价格低廉的结构,引起人们的普遍关注。静液压传动系统特点l静液压行走传动（或称容积式传动）系统主要由液压泵和液压马达组成,发动机与行走系统;司不存在机械联系,便于车…     

装载机驱动桥疲劳试验扭矩加载谱编制方法研究

为了使装载机驱动桥疲劳试验更加真实地反映装载机实际作业情况,研究了装载机驱动桥疲劳试验扭矩加载谱的编制方法。在扭矩加载谱的编制过程中,根据装载机驱动桥实际扭矩特性,提出了驱动桥疲劳试验时前传动轴正反转加载的方法,确定了前传动轴载荷谱的分级数、载荷循环阈值和疲劳试验时的转速。结果表明：依据前传动轴正反转加载的方法处理的等效效果与装载机实际作业情况相一致,很大程度地降低疲劳试验难度;疲劳试验时前传动轴转速的选择方法可使疲劳试验更加真实地模拟装载机实际作业情况;加载一个强化疲劳试验加载谱块需11.4 h,相当于装载机实际作业609.2 h,明显加快了驱动桥疲劳试验的进程。     

DAMAGE TOLERANCE ANALYSIS ON HOLLOW AXLES OF HIGH SPEED MOTOR TRAINS

According to the rules of UIC515-3, the service loads of the axles are defined, which include some different loads cases as follows： the static loads; the impact loads resulted from running through the rail joints and unevenness rails; the loads through curves and from braking. Through the calculating and analysis, the stress distribution of the hollow axles is obtained for 200 km/h high speed motor trains used in China. At the same time, the fatigue crack growth of hollow axles is studied, and the initial surface cracks of 2 mm depth caused by hard objects strike or the other causes are discussed. On the basis of the linear elastic fracture mechanics theory, the stress intensity factor of the crack of the geometry transition outside the wheel seat is also studied. Associated with fatigue crack propagation equation and the corresponding crack propagation threshold, the crack propagation characteristics under different shapes are calculated. Then the running distances are educed with different shapes propagating to the critical length, and the estimation of the residual lives about hollow axles which are the reference values of examine and repair limit of the hollow axle is given.     

Reliability and fatigue life evaluation of railway axles

The axle is one of the most important components of a rail vehicle which transmits the weight of the vehicle to the wheels, meets the vertical and horizontal loads formed during static and dynamic moving, and carries the driving moment and braking moment. The prediction of fatigue failure of axles plays an important role in preventing fatigue fractures. Varying loads on components lead to cumulative failure in the mechanism. In this study, failures in axles of rail vehicles serving the Istanbul Transportation Co. have been investigated. Statistical evaluation of real life values has been performed by taking into account the kilometer and load cycle. Equivalent stresses have been used to derive life equations and diagrams by using one of the cumulative life theories known as the Palmgren-Miner method. Finally, theoretical and practical Wohler diagrams S-N (σ-N: stress-life) have been plotted to reveal error calculation.     

近海废弃物收集系统压缩装置的疲劳寿命分析

针对近海废弃物收集系统中压缩装置在焊接处易产生裂纹等问题,对压缩装置的推板进行了疲劳寿命分析。首先基于有限元法对推板进行静力学分析,得到推板在理论载荷和约束下的应力应变云图。结果表明:推板强度能够满足设计要求,最大受力区域位于推板顶部,推板变形较大。为保证推板的安全性,对推板的结构做出改进,并进一步对改进后的推板做静力学分析。结果表明:改进后的推板变形量减小的同时强度依然满足设计要求。将改进后推板的强度分析结果导入Ansys Workbench疲劳寿命分析模块中,在推板的应力历程和疲劳特性S-N曲线的基础上,对推板的疲劳寿命进行预测。结果显示:推板的疲劳寿命最小值为9.2×10⁶次;在最大基本载荷扩大1.1倍后,推板的疲劳寿命循环次数为4.1×10⁵次;推板的整体结构相对安全,但与推板相连的液压缸基座处应力最大,产生疲劳裂纹的可能性最大。     

商用车驱动桥壳CAE分析

文中主要针对某商用车驱动桥壳半轴套管出现大量断裂问题,采用UG软件进行了三维实体建模,通过导入Hypermesh进行划分网格等前处理,利用MSC.Nastran对其进行有限元分析.并按照驱动桥壳静强度分析理论对车桥壳体进行了分析计算.结果表明:该驱动桥壳半轴套管的静强度安全系数和疲劳安全系数均小于许用极限值,从理论上验证了半轴套管会发生疲劳断裂;并提出了改进材料重新选用40钢的新方案,使其静强度和疲劳强度在理论和试验中均能满足桥壳的设计和运行工况的要求.     

圆柱体在平板和漏盘间镦粗时的力学分析

对水压机锻造平板、漏盘间镦粗圆柱体进行了力学分析。针对毛坯高径比大于1时的情况，提出了刚塑性拉应力力学模型；针对毛坯高径比小于1时的情况，提出了静水应力区切向应力力学模型。前者打破了镦粗体不论高径比如何总存在三向压应力之说；后者圆满地解释了锻造的齿轮轴法兰部分存在层状裂纹的机理。两个模型的提出，使镦粗理论走向了正确、完善的阶段。     

MECHANICAL ANALYSIS OF CYLINDERS BEING UPSET BETWEEN SPHERICAL CONCAVE PLATEN AND CONCAVE SUPPORTING PLATE

Mechanical analysis of cylinders being upset between spherical concave platen and concave supporting plate is conducted. Rigid-plastic mechanical models for cylinders are presented. When the ratio of height to diameter, is larger than 1, there exists two-dimensional tensile stress in the deformed body, when the ratio is smaller than 1, there exists shear stress in static hydraulic zone. The former breaks through the theory that there is three-dimensional compressive stress irrespective of any ratio of height to diameter. The latter satisfactorily explains the mechanism of layer-like cracks in disk-shaped forgings and the flanges of forged gear axles. The representation of the two models makes the upsetting, theory into correct and perfect stage.     

一种地铁ATC天线支架结构改进设计

分析了地铁ATC天线安装支架焊缝出现开裂和动应力较大现象的主要影响因素。采取改进设计ATC天线安装支架结构的方式,降低焊缝区域应力,提高ATC天线安装支架疲劳寿命。运用ANSYS进行了静强度和疲劳强度计算,根据静强度应力云图和疲劳强度Goodman曲线进行对比分析。分析结果表明:在同样加载条件下,改进后的ATC天线安装支架焊缝出现开裂和动应力较大处的最大应力大为改善。     

Fatigue life analysis of wheels on guideway vehicle using multibody dynamics

A guideway vehicle is used in automobile, semiconductor and LCD manufacturing industries to transport products efficiently. Since the operating speed of the guideway vehicle should be increased for maximum productivity, the weight of the vehicle has to be reduced, and this weight reduction may cause a failure of a part in the system. Therefore, the estimation of the fatigue life of the parts becomes an important problem. In this study, the fatigue life of the wheels in the guideway vehicle is estimated using an S-N curve. To obtain the fatigue life of a part, the S-N curve, the dynamic stress time history applied to the part, and the material property of the part are required. The S-N curve of the driving wheel is obtained from the fatigue experiment on wheels. To obtain the material properties of the driving wheel, which is composed of aluminum with urethane coating, the result of a compression hardware test and static analysis of the wheel’s FE model are used. The dynamic stress time history influencing the driving wheel can be obtained from linear superposition of the dynamic load time history and the static stress. The dynamic load time history is estimated by multibody dynamic analysis, and the static stress is obtained by finite element analysis.     

基于Pro/E和ADAMS的轮式装载机行驶稳定系统分析

针对为减小轮式装载机物料洒落而加入的液压减振回路的行驶稳定系统,建立其数学振动模型,推导出行驶稳定系统的等效刚度、阻尼并分析其影响因素.为求解数学振动模型的特性参数,采用Pro/E建模和ADAMS仿真方法.分析仿真结果表明:加入液压减振回路可减小行驶稳定系统的振动,而减振效果的关键是选取合适的蓄能器参数.