The Impact of Using a Secondary Swash-Plate Angle Within an Axial Piston Pump

2004 ◽  
Vol 126 (1) ◽  
pp. 65-74 ◽  
Author(s):  
Noah D. Manring ◽  
Zhilin Dong
Keyword(s):  
Equations Of Motion ◽  
Piston Pump ◽  
Plate Motion ◽  
Axial Piston Pump ◽  
Proper Position ◽  
Control Effort ◽  
Pump Speed ◽  
Swash Plate ◽  
The Impact ◽  
Axial Piston

In this paper, the control and containment forces acting on the swash plate of an axial-piston pump are examined. The most novel aspect of this research is that it includes the analysis of a secondary swash-plate angle that is occasionally used in aerospace pump applications. From a practical standpoint, swash-plate control and containment devices take on many different designs; however, they must all resist the same essential moments and forces that attempt to dislocate the swash plate from its proper position. By considering the basic machine design without its control and containment mechanisms, this work generally derives the needed forces and moments for insuring proper swash plate motion and thereby gives the designer of these machines a useful tool for designing control and containment devices of any type. In this research, the dynamic characteristics of the control and containment forces are studied by deriving instantaneous and average equations of motion for the swash plate. Results from this analysis are generated by holding the pump speed and discharge pressure constant, and by prescribing a typical second-order response for the primary swash plate angle. In conclusion, it is shown that the primary advantage of implementing a secondary swash-plate angle is that it can be used to reduce the overall control effort of the pump. Disadvantages of using the secondary swash-plate angle are associated with additional containment requirements for the swash plate.

The Control and Containment Forces on the Swash Plate of an Axial-Piston Pump

1999 ◽  
Vol 121 (4) ◽  
pp. 599-605 ◽  
Author(s):  
Noah D. Manring
Keyword(s):  
Machine Design ◽  
Piston Pump ◽  
Plate Motion ◽  
Axial Piston Pump ◽  
Proper Position ◽  
Swash Plate ◽  
Practical Standpoint ◽  
Axial Piston ◽  
Actual Control

In this research, the control and containment forces and moments acting on the swash plate of an axial-piston pump are examined. From a practical standpoint, swash plate control and containment devices take on many different designs; however, they must all resist the same essential moments and forces that attempt to dislocate the swash plate from its proper position. By considering the basic machine design without its control and containment mechanisms, this work generally derives the needed forces and moments for insuring proper swash-plate motion and thereby gives the designer of these machines a useful tool for designing control and containment devices of any type. The success of the actual control and containment devices will be measured by how well they exert the proper forces and moments on the swash plate which are presented here.

Surface modification effects on lubricant temperature and floating valve plate motion in an axial piston pump

2019 ◽  
Vol 234 (1) ◽  
pp. 3-17 ◽  
Author(s):  
David Richardson ◽  
Farshid Sadeghi ◽  
Richard G Rateick ◽  
Scott Rowan
Keyword(s):  
Equations Of Motion ◽  
Surface Modifications ◽  
Analytical Investigation ◽  
Operating Conditions ◽  
Valve Plate ◽  
Piston Pump ◽  
Plate Motion ◽  
Cylinder Block ◽  
Axial Piston Pump ◽  
Axial Piston

The objectives of this study were to experimentally measure motion of a floating valve plate and analytically investigate the effects of floating valve plate surface modifications on the lubricant film thickness and temperature distribution. In order to achieve the experimental objectives, a previously developed axial piston pump test rig was instrumented with proximity probes to measure the motion of the valve plate. To achieve the objectives of the analytical investigation, the thermal Reynolds equation augmented with the Jakobsson-Floberg-Olsson (JFO) boundary condition and the energy equation were simultaneously solved to determine the pressure, cavitation regions, and temperature of the lubricant at the valve plate/cylinder block interface. The lubricating pressures were then coupled with the equations of motion of the floating valve plate to develop a dynamic lubrication model. The stiffness and damping coefficients of the floating valve plate system used in the dynamic lubrication model were determined using a parametric study. The elastic deformation of the valve plate was also considered using the influence matrix approach. The experimental and analytical motions of the valve plate were then corroborated and found to be in good agreement. Four- and eight-pocket designs were then added as surface modifications to the floating valve plate in the dynamic lubrication model. The addition of surface modifications on the valve plate resulted in increased minimum film thicknesses and lowered lubricant temperatures at the same operating conditions.

Impact of Valve Plate Design on Noise, Volumetric Efficiency and Control Effort in an Axial Piston Pump

2006 ◽  
Author(s):  
Ganesh Kumar Seeniraj ◽  
Monika Ivantysynova
Keyword(s):  
Volumetric Efficiency ◽  
Valve Plate ◽  
Piston Pump ◽  
Design Parameters ◽  
Axial Piston Pump ◽  
Control Effort ◽  
Flow Ripple ◽  
Swash Plate ◽  
Plate Design ◽  
Axial Piston

In designing an axial piston pump, lot of attention is given to the design of the valve plate. A well designed valve plate can reduce both flow pulsations as well as oscillating forces on the swash plate. In the presented study, a computational tool, CASPAR, has been used for investigating the effect of valve plate design on flow ripple (fluid borne noise), oscillating forces (structure borne noise) and volumetric efficiency. The impact of various valve plate design parameters such as precompression grooves, cross port, indexing and additional precompression volume will be presented using simulation results from CASPAR. The study also details how rate of pressurization and decompression inside the displacement chamber directly relate to the flow ripple, forces applied on swash plate and the control effort needed to stroke the swash plate. The effect of noise reduction techniques on volumetric efficiency will also be presented with simulated results.

scholarly journals Load of the slipper-swash plate kinematic pair of an axial piston pump

2018 ◽  
Vol 157 ◽  
pp. 08013 ◽  
Author(s):  
Tadeusz Złoto ◽  
Konrad Kowalski
Keyword(s):  
Piston Pump ◽  
Geometrical Parameters ◽  
Kinematic Pair ◽  
Axial Piston Pump ◽  
Swash Plate ◽  
Axial Piston

The paper presents problems related to the twisting moment of the slipper. The load of the slipper and the piston has been presented and the complex formula of twisting moment of the slipper has been established. Achieved results has been presented graphically. The conducted research has indicated that the value of the twisting moment relays on both the exploitation and geometrical parameters.

Research on the Dynamics and Variable Characteristics of a Double-Swash-Plate Hydraulic Axial Piston Pump With Port Valves

2018 ◽  
Vol 141 (1) ◽  
Author(s):  
Pengcheng Qian ◽  
Zengqi Ji ◽  
Bihai Zhu
Keyword(s):  
Rotational Speed ◽  
Flow Distribution ◽  
Variable Method ◽  
Piston Pump ◽  
Axial Piston Pump ◽  
Working Pressure ◽  
Swash Plate ◽  
Working Principle ◽  
Hydraulic Axial Piston Pump ◽  
Axial Piston

Axial piston pumps with port valves are widely used in applications that require high pressure and high power. In the present research, a new type of double-swash-plate hydraulic axial piston pump (DSPHAPP) with port valves is presented. The structure and working principle of the pump are discussed, and the balance characteristics of the pump are analyzed. A mathematical model of the pump flow distribution mechanism considering the leakage is established, based on which the effects of centrifugal forces acting on the port valves, working pressure, and rotational speed on the flow distribution characteristics are studied. A new method of varying the displacement of the pump that changes the phase relation of the two swash plates is proposed, and the principle and regulating characteristics of the variable method are studied. A detailed analysis of the forces and moments acting on the cylinder and the bearing reaction forces is presented. Finally, the relationship between volumetric efficiency and working pressure, and rotational speed and variable angle, is presented. It is revealed through an analysis that the working principle of the pump is feasible, and that the variable method can meet the requirements of varying the displacement of the pump. The characteristics of static balance and dynamic balance of the double-swashplate pump have the advantage of reducing vibration and noise. The research results also show that the reasonable matching of the working pressure and rotational speed can increase the pump's working performance to its optimum level.

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