新型静压平衡滑靴副及其在水液压泵中的应用研究

滑靴与斜盘摩擦副是柱塞泵的一对重要摩擦副，尤其是在水液压泵中，它的设计难度更大，文章在分析传统滑靴结构的基础上，提出了一种新型螺旋槽静压平衡滑靴，克服了静压支承滑靴易堵塞，难加工的缺点，可以有效改善水液压柱塞泵的滑靴寿命和可靠性。     

径向柱塞泵中滑靴摩擦副的设计分析

该文介绍了静压支承工作原理，并利用静压支承原理对新型径向柱塞泵的滑靴结构进行了设计。分析了滑靴摩擦副的油膜刚度、漏损及影响油膜厚度的因素。     

具有动压反馈的配流轴的动态特性

在径向柱塞泵配流轴摩擦副的静压支承系统中，增加了压力补偿元件，使该系统具有动态反馈本文讲座了配流轴摩擦和静压支承在两类工况下动态特性。     

静压支承球铰副支承反力的求解

提出了一种基于静压支承原理的球铰副的设计方法,并对该摩擦副油膜支承反力进行了求解,为高速高压轴向柱塞泵的设计提供了一定的理论依据。     

具有动压反馈的配流轴设计方法

径向柱塞泵配流轴摩擦副的静压支承系统,采用动压反馈设计思想增加压力补偿元件,能有效地防止配流轴摩擦副的“抱轴”。     

滑履摩擦副摩擦机理特性及其进口阻尼的探讨

1 引言 在斜盘式轴向柱塞泵中,滑履与斜盘这对摩擦副 一般采用静压支承设计(见图1),即在摩擦副中引入压 力为pr的油液,这样就在摩擦面上产生一个与负载Fs 相反的力Fr0如果Fr=Fs,则称这种支承为完全平衡型静     

静压支承球铰副的支承特性研究

大量的研究表明，柱塞与滑靴之间的球铰副摩擦力很大程度上影响着轴向柱塞泵的性能及寿命。文章提出了一种基于静压支承的珠铰副的设计原理，并对该摩擦副的支承特性进行了研究。     

工作液特性与油膜支承参数

一、概述油膜支承是液压元件中常见的一类支承件,与滚动轴承不同。油膜支承主要依靠支承表面间的油膜层的低摩擦特性。支承表面间油膜的形成或借助于支承表面本身的粘性拖曳,或依靠外部压力油。前者称为自作用油膜支承或流体动压支承,后者为静压支承或外供压支承。液压元件中通常都含有若干对摩擦副,如柱塞泵中的柱塞与缸孔、滑履与斜盘、缸体与配油盘,液压阀中的阀芯与阀孔,齿轮泵中的啮合齿轮等。这些摩擦副部具有以下的共同特点: 1、承受着较大的负载,特别是在一些平     

柱塞泵平面配流副支承力特性试验研究

根据平面静压支承原理,推导柱塞泵平面配流副的支承力平衡方程,结合试验结果研究影响支承力大小的因素和改善支承特性的措施.结果表明,供油压力、转速等工况参数对支承力的影响很大.     

纯水液压柱塞泵滑靴副的设计问题

结合试验，分析了纯水液压泵滑靴副泄漏发生的机理，发现压紧系数是影响纯水液压泵容积效率的主要因素之一，在设计中宜取偏小值或考虑采用静压支承结构。给出了考虑柱塞副摩擦和柱塞滑靴副惯性影响的压紧系数计算方法。     

一种新型滑靴静压支承在水压马达中的应用研究

针对水压传动的新特点 ,研制了一种新的同心圆缝型滑靴静压支承。分析了这种静压支承的工作原理和基本特性 ,介绍了一个设计实例和台架试验。试验表明 ,采用静压平衡法设计的同心圆缝阻尼型静压支承结构滑靴比采用剩余压紧力法设计的滑靴底部的磨损量小 ,接触比压小。这说明同心圆缝型滑靴静压支承结构特别适合水压马达     

WORK PRINCIPLE AND CHARACTERISTIC ANALYSES OF HYDROSTATIC BEARING

Aiming at the new characteristic of water hydraulic system, a kind of hydrostatic bearing with a concentric gap damper is introduced. The lubricative film thickness of the hydrostatic bearing possesses inflexibility and the loading capacity is just determined by the geometrical dimension of the piston-slipper subassembly and has no relation with system pressure, viscosity and temperature of water and speed of rotor. Theoretical analyses and the verification of scheme done at the test rig show that the hydrostatic bearing with a concentric gap damper is especially fit for water hydraulic components.     

水压轴向柱塞泵滑靴静压支承中的惯性影响

在油压轴向柱塞泵的滑靴静压支承设计中,通常忽略Navier-Stockes方程中的惯性项,这是因为它较粘性项小得多,对计算结果的影响不大.然而,在水压轴向柱塞泵的研究中,由于水的粘度比油的粘度小得多,因此,惯性项就起着较大的作用.研究了水的流动惯性对支承间隙中的压力及流速分布的影响,从而对水压静压支承设计进行修正,得出更加合理的结果.     

液压马达滑靴副倾侧状态下的静压支承特性分析

建立了描述滑靴副倾侧状态下的静压支承特性的数学模型，综合考虑了油液粘温效庆及流体动压效应对流场的影响，在此基础上通过数值方法求解流场控制方程，得到了滑块倾侧角度、曲轴转速以及温升对静压支承性能的影响关系，分析表明，滑靴倾侧对静压支承特性的影响随曲轴转速增大而增大，油液粘温关系对承载力影响较大，对抗倾能力影响不大。     

Tribological study on hydrostatic slipper bearing with annular orifice damper for water hydraulic axial piston motor

Hydrostatic slipper bearing is an effective way to maintain a fluid film between slipper pad and swash plate that slide against each other, and thereby mitigate direct surface-to-surface contact in water hydraulic axial piston motor (WHAPM). The hydrostatic slipper bearing with an annular orifice damper is proposed, and the reaction force of the bearing in WHAPM is investigated. The effects from the friction within the cylinder bore, the dynamics of the piston, and the centrifugal force of the piston–slipper assembly are examined. The characteristic equation of the hydrostatic slipper bearing with an annular orifice damper is formulated, where the effects of various geometric parameters (e.g. damping length, supporting length, and clearance between the piston and the cylinder bore) are reflected. The relevant criterion for designing the hydrostatic slipper bearing can then be established. Results of the theoretical analyses indicate that (a) the friction coefficient, the swash plate angle, and the inertia and centrifugal loads (generated under a high motor rotating speed) would have significant influences on the reaction force; (b) an appropriate swash plate angle can help eliminate the fluctuation of the reaction force; (c) the load-carrying capacity of the hydrostatic slipper bearing is more sensitive to the damping length than to the supporting length of the piston; (d) a short damping length can help enhance the load-carrying capacity; (e) a small clearance between the piston and the cylinder bore would help improve the adaptive ability to the varying load for the hydrostatic slipper bearing, when clearance between the slipper pad and the swash plate ranges from 5 to 20 μm. Experimental studies of the slipper pads sliding against the swash plates are conducted at a custom-manufactured test apparatus, given different material combinations and design methods. The experimental results indicate that the hydrostatic slipper bearing with an annular orifice damper would decrease the possibility of the severe wear between the slipper pad and the swash plate in comparison with the hydrostatic clamping ratio bearing in the WHAPM, and the CRA laser cladding (compared to the ZrO₂·MgO-plasma-sprayed coating and the stainless steel 2Cr13) is a promising candidate as the tribo-material when sliding against composite materials in water lubrication system. The hydrostatic slipper bearing with an annular orifice damper has been successfully applied to a WHAPM developed at the Huazhong University Science and Technology. The result demonstrates that the developed bearing has a satisfactory tribolgical performance, and can be extended to the manufacture of water hydraulic axial piston pumps.     

水压轴向柱塞泵的阶梯浅腔滑靴

为了改善水压轴向柱寒泵滑靴的静压支承性能，提出了一种利用动静压混合润滑的阶梯浅腔滑靴结构，并就其结构尺寸和支承性能与普通的滑靴结构型式进行了比较和相应的计算，发现其支承性能有所提高。     

液压缸静压支承抗偏载特性分析

对液压缸静压支承抗偏载特性进行了研究,分析静压支承液压缸的润滑性能与泄漏特性,利用FLUENT软件对油膜的压力场特性进行仿真分析,分析液压缸静压支承的抗偏载特性;对静压支承导向套的矩形和工字形油腔的油膜特性进行分析对比,研究液压缸运动速度、偏心量、入口流量与静压支承导向套的承载力和润滑性能之间的关系;搭建实验台,利用电涡流传感器测量活塞杆的偏心距离,对静压支承液压缸与无静压支承液压缸的抗偏载性能进行对比。     

水压轴向柱塞泵滑靴静压支承分析与计算

如果设计不合理，水的低粘度将使得水压泵滑靴静压支承的泄漏流量极其严重，导致滑靴几乎不能正常工作，于是对其设计计算提出了新的要求，利用滑靴支承面与柱塞头之间的短节流小孔来补偿细长阻尼孔的节流作用，对滑靴结构参数和性能参数进行了详细的分析与计算，为滑靴的设计提供了一定的参考依据，讨论了温度对支承性能的影响。     

变粘度条件下静压止推轴承温升的研究

对静压支承中的静压止推轴承、静压滑环等液压元件的简化模型--旋转对称环形密封缝隙进行了深入研究,探讨了这种缝隙中油液粘度在变粘度条件下的分布规律,在此基础上推导出了环形静压支承进口和出口油液的温升计算公式,得出了有意义的结论,为设计出结构合理、性能优良的液体静压支承提供了理论依据.     

Characteristics of hydrostatic bearing/seal parts for water hydraulic pumps and motors. Part 1: Experiment and theory

In this paper, the load-carrying capacity, power losses and stiffness of disk-type hydrostatic thrust bearings including the case of eccentric loading are discussed theoretically. The numerical analysis method is established based on a two-dimensional elastohydrostatic problem with an elastic deformation model, which is extended to adapt it for a non-axisymmetric load acting on the thrust bearing. The bearing is made of a combination of stainless steel/stainless steel and stainless steel/plastics. For the elastic materials, the maximum stiffness derived from, i.e., minimum film thickness is, larger than that of the rigid material in the range of a large ratio of pocket pressure and a hydrostatic balance ratio of over unity, which is defined as the ratio of the load to the maximum hydrostatic load-carrying capacity. The maximum load-carrying capacity and minimum power loss can exist in the domain of the hydrostatic balance ratio over unity for the case of the bearing consisting of elastic/rigid materials, in comparison with that composed of the same rigid materials. For the case of water, the power loss due to leakage flow is slightly larger but that due to frictional torque is much smaller than that in the case of hydraulic oil. Then, the total power loss is much smaller than that of hydraulic oil.