共查询到18条相似文献,搜索用时 718 毫秒
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为研制变排量非对称轴向柱塞泵,依据三配流窗口轴向柱塞泵的配流思想,提出基于斜盘摆角位置反馈的排量控制方案,建立变排量非对称轴向柱塞泵的数学模型,对其频率响应影响因素进行分析。通过AMESim对该泵的变排量特性进行研究,仿真结果表明:当配流窗口A吸油、配流窗口B和T排油时,柱塞对斜盘的合力作用点轨迹具有较长的作用力臂,若配流窗口B和T压差过大,则斜盘摆角减小时响应将显著降低;当配流窗口B和T吸油、配流窗口A排油时,柱塞对斜盘的合力作用点轨迹与对称式轴向柱塞泵相似,配流窗口A压力对斜盘响应影响较小。通过试验验证了仿真模型的正确性,同时试验表明该泵具有较好的动态特性。 相似文献
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提出一种有别于常规阀配流泵的"斜盘转动而缸体不动"而采用缸体和配流阀一起旋转的双斜盘阀配流轴向柱塞式液压电机泵。建立该泵配流机构的数学模型,研究各种结构参数和工作参数对配流特性的影响,尤其是配流阀芯所受离心力对配流特性的影响。以仿真模型和得出的单个柱塞腔的压力响应曲线和输出流量曲线为基础,研究该类型泵流量脉动和侧向力脉动的特点,得出随着泵的工作转速增加,流量脉动和侧向力脉动都增大,当柱塞数量足够多时,柱塞数量的奇偶性在影响流量脉动上没有明显的区别,偶数个柱塞比奇数个柱塞产生的侧向力脉动要大。提出一种新型的阀配流轴向柱塞泵的变量调节方式,并研究该变量方式的原理和调节特性。样机泵的试验结果表明该泵的工作原理可行,进而展望双斜盘阀配流轴向柱塞式液压电机泵的应用前景。 相似文献
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基于斜盘式轴向柱塞泵结构优化的应用研究 总被引:1,自引:0,他引:1
针对应用于工程机械上某型号斜盘式轴向柱塞泵滑靴与柱塞组件及缸体试验出现局部严重磨损及干涉故障,从滑靴与柱塞组件及缸体的力平衡关系、滑靴与柱塞组件工艺与结构以及缸体配合间隙三个方面进行失效分析,在保证柱塞泵容积效率的前提下,提出以下改进措施:优化设计了滑靴内外辅助支撑面与中心通油孔的固定节流器结构、利用回程盘与滑靴联动配合理论进行结构优化尝试对比应用薄壁空心柱塞,将这些措施运用于产品批量制造,取得较好效果。为斜盘式轴向柱塞泵的结构优化、提高效率和性能方面提供实用经验,具有一定的综合效益和推广价值。 相似文献
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柱塞副是斜盘式轴向柱塞泵重要的摩擦副之一,在原有柱塞副受力分析基础上考虑了套筒的影响,建立了柱塞受力分析的数学模型,将柱塞副摩擦润滑状态看做边界摩擦,分析了柱塞转动时轴向摩擦力的变化,并得到了[P]、[PV]值得变化。针对配流副的摩擦性能采用剩余压紧力的方法计算分析了剩余压紧力、剩余压紧力系数和[P]的变化规律,以及发生磨损和"烧盘"的位置和原因。结果表明,柱塞各位置受力不均,前端大于后端,配流盘边缘易发生磨损和"烧盘"。 相似文献
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介绍了一种斜柱塞轴向柱塞泵,通过运用Matlab工具对其柱塞进行仿真受力分析,初步得出柱塞倾斜角度对泵侧向力的影响,为进一步的设计研究工作提供了参考。 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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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。 相似文献
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为了研究电比例斜盘式恒压柱塞泵的动静态特性,在分析其工作原理、运动特性和流量特性的基础上,利用SimulationX软件搭建恒压泵的机械、液压联合仿真模型进行研究,分析了变量缸大小腔直径比、变量缸弹簧刚度和主控压力阀的阀芯直径对恒压泵动态特性的影响。研究结果表明:电比例斜盘式恒压柱塞泵泵具有良好的动静态特性;主控压力阀阀芯直径越大,压力稳态值越接近设定压力值;弹簧刚度的增大和变量缸大小腔直径比值的减小都会提高恒压泵的动态响应速度,但超调量也会随之增大。 相似文献
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Experimental and Analytical Investigation of Floating Valve Plate Motion in an Axial Piston Pump 总被引:1,自引:0,他引:1
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. 相似文献
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Il-Hyun Baek Ihn-Sung Cho Jae-Youn Jung Lu Hong 《Journal of Mechanical Science and Technology》2008,22(9):1726-1733
To improve the performance of the bent-axis type axial piston pump driven by the tapered piston, it is necessary to know the
driving characteristics and mechanism of the tapered piston and the cylinder block. Since each piston not only rotates on
its axis and reciprocates in the cylinder bore but also revolves around the axis of the driving shaft, it is difficult to
analyze the driving mechanism theoretically. The theoretical mechanism for the bent-axis type axial piston pump is studied
by using the geometrical method. The driving range of the tapered piston is determined by theoretical equations. The results
show that the cylinder block is driven by one tapered piston in a limited range and the core parameters such as the tilting
angle of the piston and the ahead delay angle influence performance of the bent-axis type axial piston pump. 相似文献
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传统海水液压柱塞泵中,滑靴的固有结构形式使其易发生偏磨、烧靴等问题。提出了一种新型滑盘结构,从根本上消除了因离心力产生的滑靴倾覆问题,并减小了柱塞所受的侧向力。建立了滑盘副润滑数学模型,并分析了温度和工况参数对滑盘副的润滑特性及能耗特性的影响。结果表明:随着介质温度的升高,滑盘副的动压效应减弱,水膜厚度减小,导致泄漏量降低;同时,黏度随温度升高而降低,滑盘所受到的摩擦力减小,黏性摩擦功率损失降低;随着泵工作压力的升高,水膜厚度变大,泄漏量增大,相反黏性摩擦功率损失降低;而随着泵的工作转速的增大,滑盘副的泄漏量功率损失和黏性摩擦功率损失均有所增加。 相似文献