Calculation Method of Lubricant Film Pressure Distribution of Axial Piston Pump Slippers

2013 ◽  
Vol 328 ◽  
pp. 629-633
Author(s):  
Ya Jun Wang
Keyword(s):  
High Pressure ◽  
Pressure Distribution ◽  
Mass Conservation ◽  
Piston Pump ◽  
Axial Piston Pump ◽  
Shearing Flow ◽  
Pump Speed ◽  
Pressure Area ◽  
The Difference ◽  
Axial Piston

A method is implemented to get the pressure distribution of the axial piston pump slipper. Slipper was seen as translating thrust bearing, taking slipper tilt and spin in account, based on finite volume method, hydrodynamic and hydrostatic pressure has been calculated by using the mass conservation principle. For a representative element volume, the difference flow was averaged by the difference flow between the tilting planes, and the shearing flow by slipper translating was averaged by the shearing flow between the tilting planes. The numerical calculating result based two liquid resistance assume was compared, the results showed that two methods have got the same pressure distribution schematics, and the high pressure area locates at the slipper titling direction, but for the pressure values at high pressure area, the second method is slightly higher than the first method, and that the higher pump speed were, the higher the pressure values, and at the same pump speed, the slipper spin speed affects slightly the pressure, and at the lower pump speed, the lubricant pressure tends to the hydrostatic lubrication.

Study on the Influence of Deformation of the Slipper of Axial Piston Pump under High Pressure on Oil Film Structure

2014 ◽  
Vol 900 ◽  
pp. 734-737 ◽  
Author(s):  
Huai Chao Wu ◽  
Yun Liu Yu
Keyword(s):  
High Pressure ◽  
Film Structure ◽  
Piston Pump ◽  
Axial Piston Pump ◽  
Working Pressure ◽  
Element Analysis ◽  
Oil Film ◽  
The Finite Element Analysis ◽  
Order Of Magnitude ◽  
Axial Piston

The stress and strain of the slipper of 35 MPa high pressure axial piston pump are analyzed by the finite element analysis method, and the following facts are revealed: in spite of the fact that the slipper can satisfy the use requirement in the aspect of stress, whereas, in the aspect of strain, the deformation of the bottom of the slipper increases with the pressure increase, and the deformation of the slipper has reached the order of magnitude of the oil film thickness under 35 MPa working pressure. Therefore, when the slipper pair of 35 MPa high pressure axial piston pump is designed and its oil film performances are studied, the influence of deformation of the slipper on the oil film structure must be considered comprehensively. The results of this study can provide some guides for developing 35 MPa high pressure axial piston pump.

scholarly journals Research on thermal-fluid-structure coupling of valve plate pair in an axial piston pump with high pressure and high speed

2018 ◽  
Vol 70 (6) ◽  
pp. 1137-1144
Author(s):  
Zhanling Ji
Keyword(s):  
High Pressure ◽  
High Speed ◽  
Valve Plate ◽  
Piston Pump ◽  
Axial Piston Pump ◽  
Fluid Structure ◽  
Content Type ◽  
Oil Film ◽  
Field Coupling ◽  
Axial Piston

Purpose High pressure and high speed of the axial piston pump can improve its power density, but they also deteriorate the thermal-fluid-structure coupling effect of the friction pairs. This paper aims to reveal the coupling mechanism of the pump, for example, valve plate pair, by carrying out research on multi-physics field coupling. Design/methodology/approach Considering the influences of temperature on material properties and thermal fluid on structure, the thermal-fluid elastic mechanics model is established. A complete set of fast and effective thermal-fluid-structure coupling method is presented, by which the numerical analysis is conducted for the valve plate pair. Findings According to calculations, it is revealed that the temperature and pressure evolution laws of oil film with time, the pressure distribution law of the fluid, stress and displacement distribution laws of the solid in the valve plate pair. In addition, the forming history of the wedge-shaped oil film and mating clearance change law with rotational speed and outlet pressure in the valve plate pair are presented. Originality/value For an axial piston pump operating under high speed, high pressure and wide temperature range, the multi-physics field coupling analysis is an indispensable means and method. This paper provides theoretical evidence for the development of the pump and lays a solid foundation for the research of the same kind of problem.

Wear behavior of friction pairs of different materials for ultra-high-pressure axial piston pump

2018 ◽  
Vol 233 (5) ◽  
pp. 945-953 ◽  
Author(s):  
Jin Zhang ◽  
Xiaogang Qiu ◽  
Xuezhi Gong ◽  
Xiangdong Kong
Keyword(s):  
High Pressure ◽  
Friction Coefficient ◽  
Surface Morphology ◽  
Ceramic Materials ◽  
Piston Pump ◽  
Wear Testing ◽  
Axial Piston Pump ◽  
Ultra High Pressure ◽  
Two Samples ◽  
Axial Piston

This paper evaluates the wear of two different materials (ceramic and 30Cr2MoVA) of friction pairs of ultra-high-pressure axial piston by means of experimental investigations. Face sliding wear test was carried out on wear testing machine to analyze the coefficient of friction during boundary friction. Then wear amount of the sample is obtained by weighing with the electronic balance. The change of the surface morphology was observed by a laser confocal microscope. By comparing the friction coefficient, wear amount, surface morphology, temperature change, and roughness of the two samples, it has been found that ceramic materials have lower friction coefficient, better wear resistance, and less oil temperature rise than 30Cr2MoVA material. By the above research results it was found that ceramic materials perform better than 30Cr2MoVA, which provides the foundation for further study of the friction pair of the ultra-high-pressure axial piston pump.

Experimental Simulation of Piston Leakage in an Axial Piston Pump

2005 ◽  
Author(s):  
Zeliang Li ◽  
Richard Burton ◽  
Peter Nikiforuk
Keyword(s):  
High Pressure ◽  
Experimental System ◽  
Pressure Control ◽  
Piston Pump ◽  
Experimental Simulation ◽  
Axial Piston Pump ◽  
Very High Frequency ◽  
High Frequency Response ◽  
Pressure Discharge ◽  
Axial Piston

A method used to introduce “artificial leakage” into an axial piston pump to simulate leakage from a worn piston is described in this paper. A pressure control servo valve with a very high frequency response was employed to divert flow from the pump outlet in a prescribed waveform directly to tank. The purpose was to simulate piston leakage from the high pressure discharge chamber to the pump case drain chamber as the “simulated worn piston” made contact with the high pressure chamber. The system and associated control algorithms mimiced the action of a single worn piston at various degrees of wear. The experimental results indicated that the experimental system could successfully introduce artificial leakage into the pump which was consistent with a unit with a “real” worn piston. Comparisons of the pressure ripples from an actual faulty pump (with one worn piston) and the artificial faulty pump (with one simulated worn piston) are presented.

scholarly journals Modeling and Performance Improvement of the Constant Power Regulator Systems in Variable Displacement Axial Piston Pump

2013 ◽  
Vol 2013 ◽  
pp. 1-11 ◽  
Author(s):  
Sung Hwan Park ◽  
Ji Min Lee ◽  
Jong Shik Kim
Keyword(s):  
Computer Simulation ◽  
Performance Improvement ◽  
Simulation Software ◽  
Piston Pump ◽  
Axial Piston Pump ◽  
Constant Power ◽  
Power Regulator ◽  
Pressure Area ◽  
And Performance ◽  
Axial Piston

An irregular performance of a mechanical-type constant power regulator is considered. In order to find the cause of an irregular discharge flow at the cut-off pressure area, modeling and numerical simulations are performed to observe dynamic behavior of internal parts of the constant power regulator system for a swashplate-type axial piston pump. The commercial numerical simulation software AMESim is applied to model the mechanical-type regulator with hydraulic pump and simulate the performance of it. The validity of the simulation model of the constant power regulator system is verified by comparing simulation results with experiments. In order to find the cause of the irregular performance of the mechanical-type constant power regulator system, the behavior of main components such as the spool, sleeve, and counterbalance piston is investigated using computer simulation. The shape modification of the counterbalance piston is proposed to improve the undesirable performance of the mechanical-type constant power regulator. The performance improvement is verified by computer simulation using AMESim software.

Pressure, Flow, Force, and Torque Between the Barrel and Port Plate in an Axial Piston Pump

2008 ◽  
Vol 130 (1) ◽  
Author(s):  
J. M. Bergada ◽  
J. Watton ◽  
S. Kumar
Keyword(s):  
Pressure Distribution ◽  
Operating Conditions ◽  
Piston Pump ◽  
Axial Piston Pump ◽  
Operating Characteristics ◽  
Double Peak ◽  
Fluctuation Pattern ◽  
Total Magnitude ◽  
Axial Piston ◽  
Insight Into

This paper analyzes the pressure distribution, leakage, force, and torque between the barrel and the port plate of an axial piston pump. A detailed set of new equations is developed, which takes into account important parameters such as tilt, clearance and rotational speed, and timing groove. The pressure distribution is derived for different operating conditions, together with a complementary numerical analysis of the original differential equations, specifically written for this application and used to validate the theoretical solutions. An excellent agreement between the two approaches is shown, allowing an explicit analytical insight into barrel/port plate operating characteristics, including consideration of cavitation. The overall mean force and torques over the barrel are evaluated and show that the torque over the XX axis is much smaller than the torque over the YY axis, as deduced from other nonexplicit simulation approaches. A detailed dynamic analysis is then studied, and it is shown that the torque fluctuation over the YY axis is typically 8% of the torque total magnitude. Of particular novelty is the prediction of a double peak in each torque fluctuation resulting from the more exact modeling of the piston/port plate/timing groove pressure distribution characteristic during motion. A comparison between the temporal torque fluctuation pattern and another work shows a good qualitative agreement. Experimental and analytical results for the present study demonstrate that barrel dynamics do contain a component primarily directed by the torque dynamics.

Research on lubrication mechanism with fluid–solid coupling of port plate pair in swash plate axial piston pump

2019 ◽  
Vol 234 (4) ◽  
pp. 515-527 ◽  
Author(s):  
Zhaoqiang Wang ◽  
Yanfei Xu ◽  
Shan Hu ◽  
Hong Ji ◽  
Jian Yang
Keyword(s):  
High Pressure ◽  
Structural Parameters ◽  
Valve Plate ◽  
Piston Pump ◽  
Fluid Viscosity ◽  
Pressure Side ◽  
Axial Piston Pump ◽  
Oil Film ◽  
Swash Plate ◽  
Axial Piston

When a swash plate axial piston pump operates under high-pressure conditions, the valve plate will undergo warping deformation. Based on the theory of elastic fluid dynamic lubrication, this work establishes a fluid–solid coupling model of a swash plate axial piston pump and solves the governing equations of the lubrication with respect to the port plate pair. Cylinder speed, cylinder angle, fluid viscosity, oil film thickness, seal belt width, and structural parameters are also considered to observe their influence on the valve plate warpage deformation with the swash plate axial piston pump. The results show that the deformation cloud of the valve plate on the axial piston pump is symmetrical, with the axis line of the waist groove as the axis. The deformation of the outer seal zone on the high-pressure side of the valve plate is the largest, and the deformation of the outer seal zone on the low-pressure side of the valve plate is the smallest. Under the same conditions, the material and structure of the valve plate affect the thickness and shape of the oil film. This study provides a theoretical basis for the high pressure of the swash plate axial piston pump.

The Effect of Oil Entrapment in an Axial Piston Pump

1985 ◽  
Vol 107 (4) ◽  
pp. 246-251 ◽  
Author(s):  
S. J. Lin ◽  
A. Akers ◽  
G. Zeiger
Keyword(s):  
Pressure Distribution ◽  
Dynamical Equation ◽  
Control Volume ◽  
Equation Of Motion ◽  
Piston Pump ◽  
Axial Piston Pump ◽  
Angular Rotation ◽  
Instantaneous Pressure ◽  
Discharge Pressure ◽  
Axial Piston

Values of pressure caused by entrapment beneath a valve plate have been calculated. The technique used consists of the solution of the dynamical equation of motion in the piston control volume. Instantaneous and average values of torque have also been deduced from the pressure distribution. Plots have been constructed showing the effect of swashplate angle, pump angular rotation, discharge pressure, and entrapment angle upon instantaneous pressure, torque, and average torque for a typical axial piston pump.

Kinematic Analysis of Swash Plate Axial Piston Pump Based on Adams Simulation

2015 ◽  
Vol 741 ◽  
pp. 517-520 ◽  
Author(s):  
Hong Chuan Deng ◽  
Yu Zhang ◽  
Hai Sheng Qian
Keyword(s):  
High Pressure ◽  
High Speed ◽  
Low Cost ◽  
Piston Pump ◽  
Pump Efficiency ◽  
Axial Piston Pump ◽  
Compact Structure ◽  
Swash Plate ◽  
Radial Pump ◽  
Axial Piston

The swash plate axial piston pump is a main part in liquid press system.It is a positive displacement pump which rely on the change of the plunger cavity content to realize oil absorption or discharge of oil by the reciprocating movement of the plunger in the plunger cavity. Plunger, the slippery boots, oil pan, cylinder body are important parts of the swash plate axial piston pump. Sliding boots is one of commonly used by high-pressure plunger pump form, it can meet the needs of the high pressure high speed;the oil distribution plate and cylinder directly affect of the pump efficiency and life span[1]. Because the swash plate axial piston pump has the advantages of compact structure, fewer parts, good manufacture ability, low cost, small volume, light weight, than the radial pump has the advantages of simple structure, easy to realize step less variable and convenient maintenance, it has been widely used in the industrial production.

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