延长内曲线液压马达导轨疲劳寿命的研究

内曲线径向柱塞式液压马达因柱塞的加速度惯性力的变化对导轨产生冲击,容易导致导轨形变与疲劳点蚀,甚至出现滚柱脱离导轨的现象,极大的降低了液压马达导轨的使用寿命。考虑到滚柱脱离导轨的因素,对其产生的冲击力与液压马达导轨的使用寿命的关系进行定量的分析,根据液压马达工作原理建立动力学仿真,解出滚柱脱离导轨的具体位移数据,建立滚柱冲击导轨的有限元模型,求出导轨所受的冲击力。考虑到滚柱对导轨的冲击是交变载荷,应用Goodman算法预测导轨的疲劳寿命。研究结果表明:通过优化导轨结构参数可以有效的降低滚柱对导轨的冲击力。本篇论文的研究内容为从事内曲线液压马达研究设计人员提供了一定的参考。     

注塑机预塑机构液压马达选型浅析

本文论述了注塑机预塑机构用液压传动代替电传动的优越性,并结合预塑载荷谱及液压马达特性,选择并分析对比了摆线马达、多作用内曲线径向柱塞式马达及单作用连杆型径向柱塞式马达这三类低速大转矩马达的性能规格、产销情况等,为塑机厂选择预塑马达提供尽可能详尽的参考资料。     

基于AMESim对多作用内曲线径向柱塞马达建模与仿真分析

为了研究多作用内曲线径向柱塞马达的动态特性。在AMESim仿真软件凸轮设计器中，创建与内曲线马达定子环曲线相同的盘形滚子凸轮子模块，解决了软件模型库中元件模块不能直接搭建内曲线马达液压模型的问题。并搭建16柱塞10作用径向柱塞马达液压模型，对比验证液压模型是正确和可靠的，仿真分析得到内曲线马达在不同流量下转速曲线、不同压力下输出扭矩曲线以及转速与压力曲线，为内曲线马达的研究提供理论依据。     

基于AMESim和ADAMS的内曲线液压马达联合仿真研究

在详细分析多作用内曲线径向柱塞马达结构和工作原理的基础上,运用AMESim和ADAMS分别建立内曲线液压马达的液压模型和动力学模型,按照马达的相关数据设置参数,进行仿真,最后通过仿真结果 验证联合仿真模型的正确性.     

内曲线多作用式径向柱塞液压马达的故障分析

本文通过横梁传递切向力的内曲线多作用式径向柱塞液压马达的结构２，工作原理介绍，分析其自身的故障现象及原因。     

稳定土拌和机液压系统的改造

路面稳定土拌合机转子液压马达多是意大利SAI品牌的低速大扭矩液压马达和英国STAFFA品牌的液压马达。低速大扭矩液压马达主要有两大类:一是偏心轴单作用液压马达、静平衡无连杆液压马达和摆缸柱塞式液压马达;另一类是内曲线导轨多作用液压马达和横梁及柱塞传力的内曲线液压马达等。原理均是     

多作用内曲线径向柱塞马达结构优化分析

该文阐述了液压系统多作用内曲线径向柱塞马达设计过程中遇到的一些具体问题以及解决问题的方法,对于优化多作用内曲线径向柱塞马达的设计,提供了一定的依据和具体的途径。     

力平衡型多速双定子马达泄漏与容积效率分析

根据力平衡型多速双定子马达研究的基本原理,对其泄漏情况进行分析,研究了马达在2个和4个单马达同时工作时的容积效率变化,以及马达的3种主要泄漏:滑靴与定子表面、柱塞与转子柱塞孔以及配流壳筒与转子外表面的间隙泄漏,并进行了样机原理性实验。结果表明:随着进口油压的逐渐升高,泄漏量增大,马达容积效率呈下降趋势。该研究为力平衡型多速双定子马达的结构优化提供了参考。     

凸轮式径向柱塞马达

英国雷诺(Renoid)有限公司设计的HM 系列径向柱塞马达有许多重要的结构特点。图1所示的典型结构由支承在4段内曲线凸轮上的6个径向柱塞组成。相对的柱塞副彼此相互受压,因此转子上受力平衡,这就使重载转子轴承的全部承载能力都可用于承受侧向负荷。轴承的载荷和马达壳体的结构允许将轮子直接装在马达输出轴上。工作液体通过泄漏很小的中心配流阀进入柱塞腔     

径向双球塞柱塞马达广义椭圆定子曲线导轨的分析与设计

针对常规径向液压马达存在定子导轨曲线绘图精度低且过程繁琐、曲线导轨磨损严重的问题,提出了一种采用广义椭圆定子曲线导轨的双球塞结构的液压马达。广义椭圆定子曲线延展性好,在一定程度上可以解决常规径向液压马达定子导轨曲线绘图精度低且过程繁琐的问题;双球塞结构增大了球塞与定子曲线内壁的接触面积,一定程度上可以解决常规径向液压马达导轨磨损严重的问题。当作用次数为5~12,长、短轴比例系数为1.07~1.18时,该类型球塞马达可以获得较为优异的输出性能。     

An Investigation of Hydraulic Motor Efficiency and Tribological Surface Properties

Hydraulic motor efficiency does not depend upon viscosity alone. Under low-speed, high-torque conditions, hydraulic motors operate in the boundary regime and, therefore, surface interactions of lubricant additives can affect friction and efficiency. This article presents an investigation of boundary film formation, friction, and surface topography in benchtop tribometers and hydraulic motors. Fluids investigated included those with varied antiwear packages (zinc dialkyldithiophosphate [ZDDP], ashless) and friction modifiers (with and without) and base oil (Group I, Group III). The mechanical efficiencies of geroler, axial piston, bent-axis, and radial piston motors were measured under low-speed, high-torque conditions. The addition of a friction modifier to an ashless hydraulic fluid increased the efficiency of the motors at low speed. Energy-dispersive X-ray spectroscopy (EDX) analysis of motor surfaces after testing revealed the presence of tribochemical films from the hydraulic fluid additives. In benchtop tribometer testing, the friction modifier reduced friction significantly but also increased wear. This could be related to surface competition of the friction modifier and antiwear chemistries, as evidenced by the reduced concentration of phosphorus on the surface. These findings are significant because they provide insights toward the development of fluids that can enhance motor efficiency but also demonstrates the need for a well-balanced additive package so that improved motor efficiency can be achieved without affecting other important properties of the fluid.     

海水径向柱塞泵陶瓷摩擦副摩擦学性能研究

海水径向柱塞泵通过增加单转柱塞往复运动频率,减少了泄漏量,提高了泵的容积效率,适用于低转速场合。但低速下的泵内摩擦副尤其是微型面接触摩擦副很难形成流体动力润滑,这就对摩擦副材料性能提出了较高要求。选择几种陶瓷材料与17-4PH配对,通过海水环境中销盘摩擦实验,考察了材料的摩擦学性能。实验结果表明在不同载荷下,ZrO₂摩擦系数和磨损量均为最低,磨损后的表面粗糙度最低。ZrO₂与17-4PH配对更适合作为微型面接触摩擦副的材料。     

考虑磨损进程的轴向柱塞马达柱塞副泄漏研究

轴向柱塞马达广泛应用于航空航天、工程机械液压作动系统,容积效率是其重要指标。然而其柱塞副承载润滑状态恶劣,发生的磨损会导致泄漏损失增大,进而使马达的容积效率低于理想设计值。建立了轴向柱塞马达柱塞副磨损退化进程模拟模型,获得了其从跑合磨损到稳态磨损过程中承载界面轮廓的变化,基于此,对自然磨损状态下柱塞副泄漏行为进行分析。结果表明,随着缸孔的磨损,柱塞副泄漏量呈先增大后减小的趋势,柱塞副运行400 min时达到稳态磨损阶段,此时泄漏量相比初始泄漏量增加了2.3%。指出了柱塞副磨损状态和泄漏损失变化的映射关系,对提高轴向柱塞马达的容积效率和实现轴向柱塞马达磨损预测性维护具有一定指导意义。     

新型静力平衡能量回收油马达工作原理的探讨

传统曲轴连杆式径向油马达存在配流方式复杂、壳体和连杆制造困难等缺点,而静力平衡径向油马达柱塞所受到的侧向力较大,弹簧容易疲劳破坏,压力环容易啃伤柱塞底面,且这两种油马达工作时都浪费储存在压力油和缸体等构件中的弹性能。针对上述缺点提出一种新型静力平衡能量回收式单作用油马达的设计思想,并给出了实现方案;对其工作原理进行了分析;探讨了马达设计中的静力平衡、配油机构、能量回收等问题。     

Wear testing and specification of hydraulic fluid in industrial applications

The aim of this paper was to investigate the possibilities to use a model test to simulate the wear between cylinder bore and piston in a radial piston hydraulic motor. The tests were performed in a reciprocating test rig where the contact geometry is of the cylinder–plate type. The influence of different types of commercially available hydraulic fluids on wear protection and friction was studied. From the study, it was concluded that the use of water glycols can cause increased wear in hydraulic motors operating in low speed applications. It was also seen that the FZG test alone appears not to be enough as a hydraulic fluid wear test, at least not in the tribological conditions present in the performed wear test.     

变粘度条件下柱塞摩擦副泄漏流量的计算

在变粘度的条件下，并同时考虑柱塞的偏心和变密封长度问题，对轴向柱塞泵中校塞与缸孔之间的特殊圆环缝隙的泄漏流量公式进行了推导，得到了该圆环缝隙泄漏流量计算公式的修正系数，为高速高压轴向柱塞泵的设计提供了一定的理论依据。     

直线电机驱动水液压柱塞泵运动规划及仿真分析

水液压柱塞泵是水液压系统的关键元件,由于水介质的理化特性差异导致其泄漏、摩擦磨损、腐蚀、气蚀等现象比油压柱塞泵严重,为解决传统斜盘式水液压柱塞泵流量脉动大的问题,提出了一种新型的直线电机驱动水液压柱塞泵结构。通过研究恒流量直线电机驱动柱塞泵的可行运动规划,选取了直线电机以三角波间隔T/4相位差的运动方案,以实现双直线电机双作用水压柱塞泵实际输出较小的流量脉动。应用AMESim软件,构建了两种不同配流方式的双直线电机双作用柱塞泵系统的仿真模型。仿真发现,柱塞配流电机柱塞泵相比阀配流,其压力和流量脉动很小,其压力脉动幅度小于2%,流量脉动率仅为0.008。     

Investigation on the radial micro-motion about piston of axial piston pump

The limit working parameters and service life of axial piston pump are determined by the carrying ability and lubrication characteristic of its key friction pairs. Therefore, the design and optimization of the key friction pairs are always a key and difficult problem in the research on axial piston pump. In the traditional research on piston/cylinder pair, the assembly relationship of piston and cylinder bore is simplified into ideal cylindrical pair, which can not be used to analyze the influences of radial micro-motion of piston on the distribution characteristics of oil-film thickness and pressure in details. In this paper, based on the lubrication theory of the oil film, a numerical simulation model is built, taking the influences of roughness, elastic deformation of piston and pressure-viscosity effect into consideration. With the simulation model, the dynamic characteristics of the radial micro-motion and pressure distribution are analyzed, and the relationships between radial micro-motion and carrying ability, lubrication condition, and abrasion are discussed. Furthermore, a model pump for pressure distribution measurement of oil film between piston and cylinder bore is designed. The comparison of simulation and experimental results of pressure distribution shows that the simulation model has high accuracy. The experiment and simulation results demonstrate that the pressure distribution has peak values that are much higher than the boundary pressure in the piston chamber due to the radial micro-motion, and the abrasion of piston takes place mainly on the hand close to piston ball. In addition, improvement of manufacturing roundness and straightness of piston and cylinder bore is helpful to improve the carrying ability of piston/cylinder pair. The proposed research provides references for designing piston/cylinder pair, and helps to prolong the service life of axial piston pump.     

四配流窗口轴向柱塞马达机液耦合仿真分析

针对工程机械回转机构能耗大的问题,分析了四配流窗口轴向柱塞液压马达实现回转执行机构能量回收方法的原理。物理样机实验对泄漏和内部接触应力研究存在一定困难,且样机试制成本高、周期较长。鉴于以上情况,提出一种机液耦合仿真分析实验方法。通过AMESim和RecurDyn共同联合搭建仿真平台,得到四配流窗口轴向柱塞马达对应于不同工况下柱塞副、滑靴副间的的瞬态应力应变。仿真结果表明,四配流窗口轴向柱塞马达结构设计合理,并验证了联合仿真方法的可行性,为后续结构改进优化提供参考依据。