共查询到19条相似文献,搜索用时 125 毫秒
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正斜盘式轴向柱塞泵关键组件主要有柱塞和滑靴、缸体和配流盘、回程机构、传动轴和轴承等,这些组件的关键技术如果控制不好直接影响泵的工作质量,甚至无法工作,下面基于在实际生产中遇到的问题及问题解决谈一点看法。柱塞与滑靴柱塞与滑靴需要解决的关键技术是,柱塞与缸体孔的配合间隙:滑靴与斜盘的配合间隙;柱塞与滑 相似文献
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《液压气动与密封》2017,(2)
柱塞泵是工程机械液压系统中十分重要的动力元件,依靠柱塞在缸体孔内做往复运动时产生的容积变化进行吸油和压油。斜盘式轴向柱塞泵的缸体一般呈柱形,其柱塞中心线平行于缸体的轴线。这种结构在同等流量输出下,缸体的体积会较大。该文以斜盘式轴向柱塞泵为例,对泵的局部结构进行改进。主要是对缸体进行了优化设计,从原先的直缸直腰式柱形缸变为斜缸斜腰式锥形缸体,以及将常用的滑靴包覆柱塞的结构形式改为柱塞包覆滑靴的结构形式等.在泵体相同体积大小的情况下,轴向柱塞泵的流量特性和自吸性能得到提高。运用泵专用软件pumplinx进行仿真对比缸体结构中斜缸斜腰角度,得出使柱塞泵整体性能最佳的组合。并通过建立斜盘式轴向柱塞泵的锥形缸体结构数学模型,根据缸体结构参数的调整与组合,得出满足工况使用要求,并达到缸体刚度与强度等条件的锥形缸体泵模型。研究结果对柱塞泵的结构设计有一定的参考价值。 相似文献
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斜盘式轴向柱塞泵和马达中活塞与缸体之间的摩擦副是重要的组成部分。其性能好坏直接关系到柱塞泵和马达的寿命和效率。为了对比不同材料的活塞和缸体之间的平均摩擦力和起动摩擦力,在试验台上进行了斜盘式轴向柱塞元件活塞与缸体之间的摩擦力的测量。下面分别介绍试验台的结构原理、试件情况和试验结果。一、试验台结构在斜盘式轴向柱塞元件中,活塞除了受轴向力作用外,滑靴通过其球部对活塞有一个横向作用分力,这个力使活塞在缸体中倾 相似文献
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以滑靴副和配流副为切入点,明确了柱塞泵转子与壳体之间的作用关系;进一步借助转子动力学和有限元方法,分析了斜盘式轴向柱塞泵转子系统的动态特性。在考虑柱塞泵转子系统中柱塞-滑靴组件的非对称分布的基础上,建立了柱塞泵转子有限元模型,使用结构载荷代替转子与壳体间的作用关系,对柱塞泵转子和壳体进行切分,计算了柱塞泵转子所受的稳态激励;基于所建模型计算了柱塞泵转子的瞬态响应,分析了转子轴承刚度特性对响应结果的影响。得到了柱塞-滑靴组件对柱塞泵转子的偏心作用可等效为一恒定偏载这一规律,确定了轴承刚度变化对转子响应的频率成分影响,为进一步计算柱塞泵壳体的结构振动响应和壳体结构优化奠定了基础。 相似文献
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飞机液压系统作为飞机的重要组成系统之一,承担着整个飞机飞控系统、起落架系统以及反推系统等各系统液体驱动力的重要职责。根据生产实际需求,提出了一种在斜盘式轴向柱塞泵中,滑靴球窝研磨方案、柱塞组件的滑靴中,球窝和柱塞球头的轴向活动间隙的检测方案。而液压柱塞泵又是飞机液压系统的核心动力来源,其性能变化时刻关系着飞机液压系统乃至整个飞机的安全与健康状态。针对一种高精度滑靴球窝加工精度难保证和柱塞组件中滑靴球窝及柱塞球头的轴向活动间隙难以检测等瓶颈问题。通过研究分析提出了一种具有创新性、互换性和通用性的方案,即设计一种专用的圆柱形研磨工具和一种采用V型块定位的带表检测量具,经过生产现场验证,成功解决上述瓶颈问题,证明了此方案的可行性,同时提高了柱塞组件的制造和检测效率。 相似文献
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为了解决斜盘式轴向柱塞泵在高速高压下产生柱塞颈部断裂的问题,对柱塞泵柱塞颈部的设计及校核开展研究,提出柱塞颈部最小直径的设计方法。基于排油区柱塞滑靴组件的受力分析,建立高压下柱塞颈部受力模型。基于应力-强度干涉分布理论,结合柱塞颈部应力分布和柱塞疲劳强度,提出柱塞颈部疲劳可靠度表达式,得到轴向柱塞泵柱塞颈部最小直径。利用有限元法对最小颈部直径柱塞进行静力学仿真分析,结合应力云图实现柱塞强度的安全性校核。在额定工况下,对根据柱塞颈部最小直径的设计方法设计出的轴向柱塞泵开展了容积效率和机械效率试验,利用本研究的设计准则针对同类产品的轴向柱塞泵柱塞颈部进行设计验证,验证所提出的柱塞颈部最小直径设计方法的合理性。 相似文献
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轴向柱塞泵滑靴柱塞结构分析 总被引:1,自引:0,他引:1
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... 相似文献
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滑靴副作为大排量柱塞泵的重要摩擦副,其底面结构是影响大排量柱塞泵综合性能的关键因素。为设计一种适用于大排量柱塞泵的滑靴底面结构,改善大排量柱塞泵滑靴副的综合性能,通过构建剩余压紧力条件下滑靴副总效率数学模型,以滑靴副总效率为优化目标,引入黑洞-蚁群优化算法对大排量柱塞泵滑靴底面结构参数进行优化设计。通过仿真的方法分析了不同柱塞腔压力以及不同转速对优化前后滑靴副总效率的影响,结果表明,基于黑洞-蚁群优化算法得到的滑靴底面环结构有着明显的效率提升。 相似文献
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在斜盘式轴向柱塞泵中,滑靴副是主要的摩擦副之一。对滑靴副油膜的形成和流动状况的研究,对于改善其偏磨、烧盘等现象,增加使用寿命,减小泄漏量,提高泵的整体性能有着重要的意义。利用CFD技术对滑靴副流场进行模拟分析,得出压力分布,与通过静压平衡理论公式的计算结果对比,通过仿真结果定量直观地分析了造成磨损的原因,同时说明油膜了在滑靴副中的重要作用。分析表明,滑靴副的结构及其油膜的作用是减小磨损的重要方面。运用Fluent模拟仿真的结果和理论公式计算得出的结果基本吻合,说明Fluent仿真的可行性。 相似文献
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IhnSung Cho IlHyun Beak JaeCheon Jo JuMi Park SeokHyung Oh JaeYoun Jung 《Journal of Mechanical Science and Technology》2010,24(6):1363-1368
The bent-axis type of piston pump driven by the piston rod works by the piston rod driving the cylinder block; because of
this the taper angle of the piston rod and the swivel angle between the cylinder block and the shaft are important design
factors. If these factors cannot satisfy the conditions for optimum design, the friction loss between the cylinder bore and
the piston increases, and the pump can fail to work under conditions of severe friction and wear. Since the piston reciprocates
in the cylinder bore with high velocity, at the same time rotating on its own axis and revolving on the center of the cylinder
block, a decrease of the volume efficiency is generated because of the leakage between the cylinder bore and the piston. Therefore,
to prevent this, the piston ring is designed to be at the end of the piston, and the friction characteristics between the
piston ring and the cylinder bore require further research due to their great influence on the performance of the piston pump.
Thus, in this paper, the elastohydrodynamic lubrication (EHL) analysis of the film thickness, the pressure distribution, and
the friction force, have been studied between the piston ring and the cylinder bore in the bent-axis type of piston pump.
The analyzed results show that the friction force is influenced by the rotating speed and the discharge pressure. 相似文献
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The piston ring is one of the main elements in an internal combustion engine. Together with the cylinder sleeve, the piston ring has two basic functions: (1) contacting the cylinder sleeve to prevent the gases formed above the piston from migrating to the crankcase and (2) as a translation couple, formed of the piston‐ring and cylinder‐sleeve assembly. Complex tribological phenomena occur in the piston‐ring and cylinder‐sleeve tribosystem, according to variations in sliding speed, gas pressure, and temperature. This paper presents a method of calculation of the thickness of the lubricant film in the piston‐ring and cylinder‐sleeve tribosystem, using the Reynolds equation, integrated in specific conditions. According to the Newtonian behaviour of the lubricant, the shear stresses in the lubricant film between the piston ring and cylinder sleeve are determined. A computational procedure to determine flash temperatures in the piston‐ring and cylinder‐sleeve tribosystem is presented. The theoretical results, including film thickness, sliding speed, gas pressure, and flash temperatures for a complete crankshaft cycle are also presented. 相似文献
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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. 相似文献
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斜盘式轴向柱塞泵内柱塞偶件间油膜为相对运动的偶件提供润滑及密封作用。油膜流动将直接影响柱塞偶件的工作性能。深入分析偶件间油膜的流动规律对设计与优化柱塞偶件有重要意义。基于Navier-Stokes(N-S)方程,引入Navier边界滑移推导偶件间油膜流动方程,根据柱塞运动的周期性规律,分析单个周期内滑移长度和柱塞泵转速对油膜流动剪应力及流量的影响。研究发现:吸油阶段时近柱塞壁面处油膜剪应力随滑移长度增大而减小,流量随着滑移长度增大而增大,柱塞运动速度最大且滑移长度由1 μm增大到3 μm后,剪应力减小18%,流量增大13.59%;排油阶段柱塞运动速度越大,近柱塞壁面处剪应力和油膜流量与无滑移条件下的差距越小。在滑移长度为1 μm的条件下柱塞泵转速由1 500 r/min增大到4 000 r/min时,近柱塞壁面处的油膜剪应力与无滑移条件下相比降低明显,一个周期内油膜总流量与无滑移条件下相比差距减小。 相似文献