Designing a Control and Containment Device for Cradle-Mounted, Axial-Actuated Swash Plates

2002 ◽  
Vol 124 (3) ◽  
pp. 456-464 ◽  
Author(s):  
Noah D. Manring
Keyword(s):  
High Pressure ◽  
Closed Form ◽  
High Speed ◽  
Control Device ◽  
Operating Conditions ◽  
Axial Piston Pumps ◽  
Swash Plate ◽  
Proper Design ◽  
Critical Components ◽  
Axial Piston

Many axial-piston pumps utilize a swash plate for regulating discharge flow. In this research, the required control and containment forces are examined for a cradle-mounted, axial-actuated swash plate. These forces are described in closed-form for providing the designer with information that is necessary for sizing these critical components within the pump. In this research, it is shown that a proper design of the control device may be used to load the cradle bearings equally during high-pressure operation. While previous research has shown that a transverse-actuated swash plate will tend to dislocate itself from the cradle during high speed and low pressure operation, this research shows that an axial-actuated swash-plate tends to keep the swash-plate well seated within the cradle during all operating conditions. The information presented here is generalized for typical characteristics of swash plates that are used within the industry and is therefore useful for analyzing existing designs as well as new ones.

Designing a Control and Containment Device for Cradle-Mounted, Transverse-Actuated Swash Plates

2000 ◽  
Vol 123 (3) ◽  
pp. 447-455 ◽  
Author(s):  
Noah D. Manring
Keyword(s):  
Closed Form ◽  
Failure Mode ◽  
Low Pressure ◽  
Design Criterion ◽  
Catastrophic Failure ◽  
Successful Operation ◽  
Axial Piston Pumps ◽  
Swash Plate ◽  
Critical Components ◽  
Axial Piston

Many axial-piston pumps utilize a swash plate for regulating discharge flow. In this research, the required control and containment forces are examined for a cradle-mounted, transverse-actuated swash plate. These forces are described in closed-form for providing the designer with information that is necessary for sizing these critical components within the pump. In this research, it is shown that improper design of the containment device will cause the swash plate to dislocate itself from the cradle. In general, it is noted that this failure mode is severe and that it may even cause catastrophic failure of the pump. In summary, a design criterion is presented which describes the limits of successful operation during both high and low-pressure conditions. Design and operational changes are suggested for improving the adequacy of the swash-plate containment design.

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.

Analysis on Kinematics between Piston and Cylinder Block in Swash-Plate Axial Piston Motor

2014 ◽  
Vol 1006-1007 ◽  
pp. 313-316 ◽  
Author(s):  
Jin Yan Shi
Keyword(s):  
High Pressure ◽  
High Speed ◽  
Displacement Velocity ◽  
Cylinder Block ◽  
Swash Plate ◽  
Axial Piston

Analysis was carried out to the kinematics between piston and cylinder block in the axial piston motor. And the formula of displacement, velocity and acceleration of the movement of piston in the cylinder block were given, and some suggestions were also presented to help the design of the axial piston motor with high speed and high pressure in the further.

Improving the Volumetric Efficiency of the Axial Piston Pump

2012 ◽  
Vol 134 (11) ◽  
Author(s):  
Shu Wang
Keyword(s):  
Operating Conditions ◽  
Volumetric Efficiency ◽  
Valve Plate ◽  
Piston Pump ◽  
Efficient Design ◽  
Axial Piston Pumps ◽  
Definition Of ◽  
Engineering Practices ◽  
First Time ◽  
Axial Piston

The volumetric efficiency is one of the most important aspects of system performance in the design of axial piston pumps. From the standpoint of engineering practices, the geometric complexities of the valve plate (VP) and its multiple interactions with pump dynamics pose difficult obstacles for optimization of the design. This research uses the significant concept of pressure carryover to develop the mathematical relationship between the geometry of the valve plate and the volumetric efficiency of the piston pump. For the first time, the resulting expression presents the theoretical considerations of the fluid operating conditions, the efficiency of axial piston pumps, and the valve plate designs. New terminology, such as discrepancy of pressure carryover (DPC) and carryover cross-porting (CoCp), is introduced to explain the fundamental principles. The important results derived from this study can provide clear recommendations for the definition of the geometries required to achieve an efficient design, especially for the valve plate timings. The theoretical results are validated by simulations and experiments conducted by testing multiple valve plates under various operating conditions.

Applicability of Pump Models for Varying Operational Conditions

2003 ◽  
Author(s):  
Heikki O. J. Kauranne ◽  
Jyrki T. Kajaste ◽  
Asko U. Ellman ◽  
Matti T. Pietola
Keyword(s):  
Rotational Speed ◽  
Operating Conditions ◽  
Fluid Temperature ◽  
Limited Information ◽  
Operational Conditions ◽  
Axial Piston Pumps ◽  
Pump Construction ◽  
Temperature And Pressure ◽  
Axial Piston ◽  
Type Pressure

It is commonly known that the characteristics of a fluid power pump depend on pump type, pressure, rotational speed and displacement. But in addition to these, also all the other parameters or factors associated with the operating conditions may have a significant effect on the characteristics. The most important of these are the pump construction and size, operating point temperature and the characteristics of the oil, which also depend on temperature and pressure. The aim of this study is to show the effects that the varying operational conditions have on the characteristics of a axial piston pump, to compare the measured characteristics with other published characteristics of axial piston pumps and to study the capability of pump models to represent these characteristics. The results include information of the effects of fluid temperature, type of fluid and the setting value of the displacement on the pump characteristics along with the effects of pressure and rotational speed. The sensitivity of the pump to each of the parameters is discussed. The effect of limited information of pump characteristics on the reliability of simulation results is studied using the Schlo¨sser models.

scholarly journals Degradation Status Recognition of Axial Piston Pumps under Variable Conditions Based on Improved Information Entropy and Gaussian Mixture Models

Processes ◽  
2020 ◽  
Vol 8 (9) ◽  
pp. 1084
Author(s):  
Chuanqi Lu ◽  
Zhi Zheng ◽  
Shaoping Wang
Keyword(s):  
Information Entropy ◽  
Gaussian Mixture ◽  
Operating Conditions ◽  
Processing Variable ◽  
Axial Piston Pumps ◽  
Failure Data ◽  
Status Recognition ◽  
Axial Piston ◽  
Variable Operating Conditions ◽  
Instantaneous Energy

Axial piston pumps are crucial for the safe operation of hydraulic systems and usually work under variable operating conditions. However, deterioration status recognition for such pumps under variable conditions has rarely been reported until now. Therefore, it is valuable to develop effective methods suitable for processing variable conditions. Firstly, considering that information entropy has strong robustness to variable conditions and empirical mode decomposition (EMD) has the advantages of processing nonlinear and nonstationary signals, a new degradation feature parameter, named local instantaneous energy moment entropy, which combines information entropy theory and EMD, is proposed in this paper. To obtain more accurate degradation feature, a waveform matching extrema mirror extension EMD, which is used to suppress the end effects of EMD decomposition, was employed to decompose the original pump’s outlet pressure signals, taking the quasi-periodic characteristics of the signals into consideration. Subsequently, given that different failure modes of pumps have different degradation rates in practice, which makes it difficult to effectively recognize degradation status when using the modeling methods that need the normal and failure data, a Gaussian mixture model (GMM), which has no need for failure data when building a degradation identification model, was introduced to capture the new degradation status index (DSI) to quantitatively assess the degradation state of the pumps. Finally, the effectiveness of the proposed approach was validated using both simulations and experiments. It was demonstrated that the defined local instantaneous energy moment entropy is able to effectively characterize the degree of degradation of the pumps under variable operating conditions, and the DSI derived from the GMM is able to accurately identify different degradation states when compared with the previously published methods.

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