柱塞泵预紧力对滑靴回程盘影响的仿真分析

轴向柱塞泵中滑靴的倾覆偏磨、回程盘的磨损与其所受应力大小有关。为改善二者的磨损性能,研究预紧力增大对滑靴、回程盘应力变化特性的影响。通过对A4VG125型柱塞泵中心弹簧预紧力的分析计算,应用仿真软件ADAMS和ANSYS搭建轴向柱塞泵的刚柔耦合模型,研究分析预紧力增大时,滑靴、回程盘应力的变化规律,得到同周期内最大应力点图和应力云图。分析结果表明:合理增大预紧力有助于减小滑靴平面、滑靴颈部的磨损;回程盘孔口与滑靴颈部的碰撞得到改善;当预紧力为707N时,该型号轴向柱塞泵的滑靴与回程盘应力分布状态最好。     

轴向柱塞泵滑靴柱塞结构分析

轴向柱塞泵滑靴柱塞结构分析田国瑞一、前言如图１所示．常用的ＣＹ型轴向柱塞泵滑靴柱塞的优点很多．但与图２所示的开路式泵的滑靴柱塞结构相比．经生产试验验证和用户使用证明、开路式泵的滑靴柱塞结构明显优于ＣＹ型泵滑靴柱塞结构：它图１ＣＹ型轴向拉塞泵滑靴柱塞结...     

基于ANSYS workbench的柱塞泵回程盘结构优化设计

针对某型号斜盘式轴向柱塞泵回程盘与柱塞组件试验出现局部严重磨损及干涉故障,利用ANSYS Workbench软件对斜盘式柱塞泵回程盘进行了强度和刚度分析,首先找出了回程盘的应力主要集中区和变形量较大的位置,为回程盘的设计提供了参考;其次,对回程盘进行了优化,在保证回程盘的强度达到设计要求的情况下,增强了回程盘的刚度,改善了泵的整体性能,为斜盘式轴向柱塞泵的结构优化、提高效率等方面提供实用经验和参考。     

轴向柱塞泵滑靴磨损故障分析

通过对轴向柱塞泵产生松靴故障的机理分析,选取8~12kHz特征频率范围来研究故障信息,经信号处理后,对比正常泵和故障泵的低频信号功率谱图,171.5 Hz及其倍频处是滑靴磨损故障特征的敏感频率。     

轴向柱塞泵滑靴副倾覆现象数值分析

采用一种新的研究方法对滑靴副油膜动态特性进行研究,首先对滑靴副静压支承固定阻尼加可变阻尼组成的流量压力负反馈调节系统进行建模,然后以此为边界条件对滑靴受力/力矩情况和滑靴副倾覆油膜模型的耦合关系进行研究,最后通过Matlab编程搭建滑靴副油膜耦合关系仿真模型,用Newton迭代法求解油膜模型非线性方程组,动态显示滑靴副油膜特性,以分析滑靴副倾覆现象的本质以及弹簧预压紧力对滑靴副倾覆的影响.利用三点确定一平面的原理,通过三点处油膜厚度值对滑靴副油膜厚度场进行建模.分析结果表明,滑靴偏磨一般发生在柱塞腔吸油区到排油区的过渡区,此时的滑靴倾覆程度最大,在滑靴结构一定时,可以通过增大弹簧预压紧力的方法减弱滑靴的倾覆程度.     

轴向柱塞泵滑靴副楔形油膜特性分析

轴向柱塞泵工作过程中,滑靴会在倾覆力矩作用下相对于斜盘表面形成一定的楔形油膜,在油膜静压支承力和油膜动压效应和挤压效应作用下滑靴副楔形油膜压力场始终与滑靴所受的外力和外力矩处在动态的平衡中。本文采用一种新的研究方法对滑靴油膜动态特性进行研究,用牛顿迭代算法对滑靴受力/力矩情况和滑靴副油膜的耦合关系进行研究。在Matlab软件中以低层编程的方法揭示滑靴副楔形油膜动态特性,从而对滑靴副工作特性进行预测。     

海水淡化轴向柱塞泵滑靴副的结构设计

由于采用黏度比液压油低得多的海水进行润滑,海水淡化轴向柱塞泵滑靴副的结构设计方法需要在油压轴向柱塞泵的基础上进行修正.采用剩余压紧力法进行设计时剩余压紧系数的选取比油泵要小,采用完全平衡法进行设计时,通过分析得出可变阻尼区流动一般处于层流状态,而固定阻尼区的流动一般处于湍流状态,导致固定阻尼的压力一流量特性发生变化,可使得细长孔阻尼的长度大为减小,静压支承液膜刚度理论不再成立.     

带斜盘夹角的轴向柱塞泵流量脉动分析

流量脉动品质的好坏是衡量液压泵工作性能的重要指标之一。本文就带斜盘夹角的轴向柱塞亲流量脉动情况进行分析,并提出了降低液压泵流量脉动的具体措施。     

轴向柱塞泵松靴故障特征信号的分析与选择

对轴向柱塞泵产生松靴故障的机理进行分析.选取振动信号和油液温升信号作为监测参量.分析研究表明,泵壳体振动信号和外泄口油液的温升信号是轴向柱塞泵松靴故障的敏感特征参量.     

斜轴式轴向柱塞泵干涉分析计算

根据斜轴式柱塞泵的工作原理和结构特点,分析研究了这种泵存在的干涉问题,指出了孔壁干涉、端面干涉和杆面干涉三种干涉情况,提出了判别干涉的准则,并应用向量分析法推导出了避免这些干涉的条件。根据这些条件进行干涉分析计算简单易行。为保证斜轴式柱塞泵正常运转,必须避免这些干涉。这些条件的提出为斜轴式柱塞泵的设计制造提供理论依据,并具有重要的实际意义。     

斜盘式轴向柱塞泵最佳柱塞数确定方法

给出了斜盘式轴向柱塞泵结构及性能的主要影响因素,分析了柱塞数与各因素之间的关联性。运用综合因素评价法,对各因素进行综合性加权比较,得出了柱塞数选取最佳方案。运用该方法确定了K3V型双联轴向柱塞泵设计中的最佳柱塞数(最佳柱塞数为9)。     

轴向柱塞泵配流盘结构对流量脉动的影响

运用三次元流体分析技术对轴向柱塞泵的流量脉动进行了数值解析,定性分析了轴向柱塞泵不同结构形式配流盘流量脉动的关系.     

Dynamic Modeling of Floating Valve Plate Motion in an Axial Piston Pump

The objectives of this study were to analytically and experimentally investigate the motion of the floating valve plate in an axial piston pump under various operating conditions. To achieve the objectives of the analytical investigation, the equations of motion for the valve plate were coupled with a time-dependent lubrication model. The balance pistons that support the floating valve plate were represented by equivalent spring and dashpot systems. The system of equations was then solved using the Runge-Kutta and the control volume finite difference methods to determine the pressure, film thickness, and motion of the valve plate for various operating conditions. To achieve the experimental objectives, a previously developed axial piston pump test rig was instrumented with proximity probes to measure the motion of the valve plate. The stiffness and damping of the balance pistons supporting the floating valve plate were determined using the impact and frequency response methods. Using the experimentally determined stiffness and damping coefficients in the coupled dynamic lubrication model, the analytical and experimental results of the valve plate motions were compared. The model was then used to conduct a parametric study to determine the overall system stiffness and damping coefficients during pump operation. Using the stiffness and damping coefficients from the parametric study in the dynamic lubrication model, the pressure, film thickness, and motion of the valve plate were calculated for various operating conditions. The experimental and analytical displacements of the valve plate were then corroborated and found to be in good agreement.     

轴向柱塞泵降噪分析与研究

轴向柱塞泵在某平地机装机试用过程中出现啸叫的现象,通过原型泵和故障泵噪声对比测试分析,判断柱塞泵噪声异常是由于配流盘过渡区采用小孔阻尼引起的。根据对配流盘的计算分析、CFD仿真,认为配流盘过渡区小孔阻尼结构会导致柱塞腔较大的压力冲击,从而产生较大的流体噪声。将配流盘过渡区小孔结构改进为三角槽结构后,降噪效果得到显著的改善。     

Experimental and Analytical Investigation of Floating Valve Plate Motion in an Axial Piston Pump

The purpose of this investigation was to experimentally measure the motion of the floating valve plate in an axial piston pump under various operating conditions and to develop a model to determine how the floating valve plate motion affected the lubricating pressures between the valve plate and cylinder block. In order to achieve the objectives, a hydraulic circuit was designed and developed to incorporate and operate a floating valve plate axial piston pump. The hydraulic circuit integrating the axial piston pump (axial piston pump apparatus, APPA) consists of a series of valves, pressure sensors, a charge pump, flow meters, temperature sensors, a heat exchanger, and proximity probes. The floating valve plate axial piston pump housing was modified to incorporate three proximity probes to measure the valve plate position and motion relative to the cylinder block, thus allowing for determination of the film thickness within this contact. The results illustrate that as the pump starts up the valve plate experiences vibrations and begins to lift relative to the cylinder block. Then as the pump reaches steady-state operation the valve plate achieves a fixed position and tilt. The results also demonstrate that under steady-state operation, the valve plate vibrates and this vibration correlates well with the speed and the number of pistons in the pump. The measured film thickness results were then used in a lubrication model to determine the pressures generated between the floating valve plate and the cylinder block. The analytical results highlight how the motion of the valve plate directly correlates to the pressure pulsations seen in the lubricating gap.     

轴向柱塞泵配流副润滑特性的研究进展

介绍了国内外有关轴向柱塞泵配流副润滑特性方面的研究成果，并进行了综合分析和比较。指出需借鉴国外现有的关于轴向柱塞泵配流副压力分布规律的理论，确定最佳剩余压紧系数，现有的配流副结构设计方法和理论依据需进一步完善。建立了轴向柱塞泵配流副润滑特性试验平台，可在不同压力、温度、转速、结构下测试配流副间隙并得出配流副润滑膜的形成及变化规律。通过润滑特性测试平台还可以确定最佳水液压柱塞泵配流副润滑结构和材料配对，为研制出性能良好的轴向柱塞式水液压泵奠定实验基础。     

水压柱塞泵(马达)配流盘的研究与仿真

介绍了柱塞泵 (马达 )配流型式的发展 ,对水压轴向柱塞泵 (马达 )力矩全平衡型配流盘进行了分析。通过数字仿真研究了配流盘结构对柱塞腔内压力的影响 ,发现减振槽及其过流面积对气蚀的产生有直接的作用 ,合适的吸入口压力或背压可减小泵或马达发生气蚀的可能性     

斜盘式轴向柱塞泵泄漏量的分析与计算

通过对斜盘式轴向柱塞泵泄漏途径的分析研究,得到了奇偶数泵的泄漏量计算公式,并对泵在不同参数下的泄漏量进行了仿真分析,为进一步研究泄漏量对奇偶数斜盘式轴向柱塞泵实际流量及脉动系数的影响提供了较好的理论依据。     

水压柱塞泵中柱塞与缸孔接触比压的分析与探讨

在考虑柱塞与缸孔之间间隙的基础上 ,利用材料力学的基本原理 ,对柱塞与缸孔的受力模型做了详尽推导 ,并运用 MATLAB工具进行求解 ,结果发现该接触比压值较传统方法的计算值大 1 0倍以上 ,同时发现该接触比压受摩擦副材料的弹性模量、摩擦副间隙大小等因素的影响。针对该接触比压的深入分析为水压柱塞泵柱塞与缸孔的粘着磨损现象提供了可信的解释