论斜盘式轴向柱塞泵与叶片泵的竞争与发展

论斜盘式轴向柱塞泵与叶片泵的竞争与发展徐绳武斜盘式轴向柱塞泵（以下简称斜盘式轴向泵）和叶片泵是现代液压传动系统中广泛使用的动力元件，也是可实现无级变量的两类泵。１９０６年斜盘式轴向泵第一次使用于军舰的炮塔上到现在已有近９０年的历史；从Ｈ．Ｆ．Ｖｉｃｋ...     

斜盘式轴向柱塞泵的单片机流量控制研究

介绍了一种由单片机控制斜盘式轴向柱塞泵的变量机构,以及以步进电机驱动的数字控制轴向柱塞泵,包括数字泵的工作原理,硬件的设计思路和主程序框图。通过控制步进电机的运动来实现对柱塞泵流量的精确控制。     

轴向柱塞泵变量机构控制策略研究

轴向柱塞泵具有耐高压、效率高、传输功率大、转速范围宽、寿命长等优点,已经在液压机、工程机械和船舶等场合中有着广泛的应用,但是由于其非线性特性,现有工作响应速度较慢。通过经验累计和理论计算,得到该变量机构的数学模型。针对轴向柱塞泵变量机构控制的研究,从模糊控制着手,分析了该控制效果的稳定程度,经过与经典PID控制方法仿真对比实验,结果表明：T-S PID稳定性更好,响应速度更快,可以减少50%左右的调整时间。     

双联斜盘式轴向柱塞泵在行走机械中的应用

针对行走液压的性能要求,分析了双联斜盘式轴向柱塞泵的结构和工作特点.实际应用表明,双联斜盘式轴向柱塞泵适合在结构紧凑、功率/体积比大、无级变速、性能可靠的行走机械上使用.     

斜盘式轴向柱塞泵配流副失效原因的研究

在工程机械液压传动系统中,经常出现配流副早期磨损失效,导致斜盘式轴向柱塞泵磨损失效。通过对配流副润滑油膜厚度的实验研究和综合分析,得出配流副磨损失效的主要原因是油液中的污染物造成的,并提出改善配流副工作性能、延长泵使用寿命的措施。     

直轴斜盘式柱塞泵常见故障的排除

该文归纳了国产典型直轴斜盘式柱塞泵及关键零部件在使用过程中的常见故障,分析了故障原因并提出处理措施。     

直轴斜盘式柱塞泵常见故障的排除

本文归纳了国产典型直轴斜盘式柱塞泵及关键零部件在使用过程中的常见故障,分析了故障原因并提出处理措施。     

变量柱塞泵常见四种故障

<正>斜盘式轴向柱塞泵(简称柱塞泵)的形式有多种,但其构造原理基本相同。现以通轴泵为例介绍其常见故障原因。1.缸体与配流盘接触端面磨损     

On the instantaneous and average piston friction of swash plate type hydraulic axial piston machines

Piston friction is one of the important but complicated sources of energy loss of a hydraulic axial piston machine. In this paper, two formulas are derived for estimating instantaneous piston friction force and average piston friction moment loss. The derived formula can be applicable for piston guides with or without bushing as well as for axial piston machines of motoring and pumping operations. Through the formula derivation, a typical curve shape of friction force found from several experimental measurements during one revolution of a machine is clearly explained in this paper that it is mainly due to the equivalent friction coefficient dependent on its angular position. Stribeck curve effect can easily be incorporated into the formula by replacing outer and inner friction coefficients at both edges of a piston with the coefficient given by Manring (1999) considering mixed/boundary lubrication effects. Novel feature of the derived formula is that it is represented only by physical dimensions of a machine, hence it allows to estimate the piston friction force and loss moment of a machine without hardworking experimental test.     

Relation between pressure variations and noise in axial type oil piston pumps

Pressure variation is one of the major sources on noise emission in the axial type oil piston pumps. Therefore, it is necessary that the pressure variation characteristics of the oil hydraulic piston pumps be clarified to reduce the pump noise. Pressure variations in a cylinder at the discharge region and the pump noise were simultaneously measured with discharge pressures and rotational speeds during the pump working. To investigate the effects of the pre-compres-sion and the V-notch in the valve plate, we used the three types of valve plates. In this research, it is clear that the pressure variation characteristics of axial type oil piston pumps is deeply related to the pre-compression and to the V-notch design in valve plate. Therefore, we could reduce the pump noise by using the appropriate pre-compression angle and the notch design that are between the suction port and the discharge port in valve plate.     

锥形缸体斜柱塞泵的回程机构分析与设计

锥形缸体斜柱塞泵是在传统的柱形缸体直柱塞泵基础上发展而来的,其性能比柱形缸体直柱塞泵更为优良,但设计和加工难度也更大,其中锥形缸体斜柱塞泵的回程机构关系到泵的性能和寿命.在该文中,对锥形缸体斜柱塞泵回程机构的结构及受力进行了分析,计算出回程力和中心弹簧预压力,给出了回程盘几何尺寸,其结果可作为锥形缸体斜柱塞泵回程机构的设计依据.     

Lubrication characteristics of dual piston ring in bent-axis type piston pumps

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.     

Driving mechanism of tapered pistons in bent-axis design axial piston pumps

In order to assure the quality of the bent axis design axial piston pumps driven by tapered pistons, it is necessary to know the characteristics of force applied to tapered pistons and the mechanism for driving the tapered pistons. Since they are able to perform both reciprocating and spinning motions in cylinder block, it is difficult to understand the driving mechanismand-tomeasure the forces applied to tapered pistons experimentally. In the presem study, the theoretical mechanism for driving the tapered pistons is studied by use of the geometric method. The driving area of tile tapered pistons is measured by measuring the strain of a cylinder forced against a tapered piston using an electric strain gauge and a slip ring. The forces applied to tapered pistons is also investigated with the change of discharge wessure and the rotational speed As a results of this investigation, it is concluded that the cylinder block is driven by one tapered piston in a limited area and flue driving area is changed due to space angle of the tapered pistons and the swivel angle of the cylinder block. It is also observed that the force applied to tapered pistons increases as the discharge pressure and the rotational speed increase.     

斜盘式柱塞泵柱塞-缸体摩擦副的润滑计算与分析

通过对柱塞-缸体间的油膜厚度进行理论计算与分析,进一步分析柱塞-缸体间的倾角、供给压力、柱塞自转及偏心距等相关因素对油膜压力分布的影响,并从润滑角度提出改善其润滑状态、减少磨损和延长使用寿命的建议.     

Measurement of fluid film thickness on the valve plate in oil hydraulic axial piston pumps (I)-bearing pad effects-

The tribological mechanism between the valve plate and the cylinder block in oil hydraulic axial piston pumps plays an important role on high power density. In this study, the fluid film thickness between the valve plate and the cylinder block was measured with discharge pressure and rotational speed by use of a gap sensor, and a slip ring system in the operating period. To investigate the effect of the valve plate shapes, we designed two valve plates with different shapes : the first valve plate was without a bearing pad, while the second valve plate had a bearing pad. It was found that both valve plates behaved differently with respect to the fluid film thickness characteristics. The leakage flow rates and the shaft torque were also experimented in order to clarify the performance difference between the valve plate without a bearing pad and the valve plate with a bearing pad. From the results of this study, we found out that in the oil hydraulic axial piston pumps, the valve plate with a bearing pad showed better film thickness contours than the valve plate without a bearing pad.     

轴向柱塞泵配流副润滑特性分析

配流副润滑特性直接影响柱塞泵的使用性能及工作特性,而油膜承载力是衡量润滑特性的重要指标,为此开展轴向柱塞泵配流副油膜承载力的研究。首先根据柱坐标下雷诺方程(Reynolds)推导配流副楔形油膜压力场模型,其次建立配流副稳态计算模型,借助CFD流场仿真软件分析油膜承载力对配流副润滑特性的重要影响。对比理论模型与仿真结果,验证理论模型的正确性,为轴向柱塞泵的性能优化奠定基础。     

Measurment of fluid film thickness on the valve plate in oil hydraulic axial piston pumps (Part II: Spherical design effects)

Tribologtcal characteristics in the sliding parts of oil hydraulic piston pumps are very important in increasing overall efficiency In this study, the fluid film between the valve plate and the cylinder block was measured by using a gap sensor and the mercury-cell slip ring unit under real working conditions To investigate the effect of the valve shape, we designed three valve plates each having a different shape One of the valve plates was without bearing pad, another valve plate had bearing pad and the last valve plate was a spherical valve plate It was noted that these three valve plates observed different aspects of the fluid film characteristics between the cylinder block and the valve plate The leakage flow rates and the shaft torque were also investigated in order to clarify the performance difference between these three types of valve plates From the results of this study, we found that the spherical valve plate estimated good fluid film patterns and good performance more than the other valve plates in oil hydraulic axial piston pumps