Investigation on structural optimization of anti-overturning slipper of axial piston pump

Xu, Bing; Zhang, Junhui; Yang, Huayong

doi:10.1007/s11431-012-4955-x

Cited by 52 publications

(35 citation statements)

References 5 publications

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“…3, where S 1 , S 2 , S 3 , and S 4 stand for the quadrants divided by the o-xy coordinate system. Taking a certain representative elemental volume dv of oil film as the analytical object, the corresponding tangential velocity v o of the representative elemental volume can be derived as (Xu et al, 2012) …”

Section: Simulation Modelingmentioning

confidence: 99%

“…The implicit numerical program models are built by using the Reynolds equation of lubrication, solved with the finite volume method (FVM), taking the influences of dynamic macro-motion and micro-motion of parts, the elastic deformation, the force equilibrium, and the pressureviscosity effect into consideration. The details are given in the previous studies of the authors (Xu et al, 2012;.…”

Section: Components Analysis Of Leakage Flow Via the Gap Between Slipmentioning

confidence: 99%

“…(41) and (42), where δ pm and δ sm denote the mean depths of oil film of piston/cylinder pair and slipper/swash plate pair, respectively, K p and K s are the total numbers of discrete nodes of oil film field of piston/cylinder pair and slipper/swash plate pair, and δ pk and δ sk are the depths of the kth discrete node of oil film field of the piston/cylinder pair and the slipper/swash plate pair, respectively. The discretization methods of oil film field of piston/cylinder pair and slipper/swash plate pair are introduced in detail in the previous studies undertaken by the present authors (Xu et al, 2012;2015c). .…”

Section: Components Analysis Of Leakage Flow Via the Gap Between Slipmentioning

confidence: 99%

“…12, the overturning angle α s of slipper can be calculated by Eq. (43) respectively, which can be determined by the verified implicit numerical program developed in the previous study of the authors (Xu et al, 2012).…”

Section: Variation Characteristics Of Volumetric Losses With Displacementioning

confidence: 99%

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Characteristics of volumetric losses and efficiency of axial piston pump with respect to displacement conditions

Zhang

et al. 2016

JZUS-A

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Abstract:A good efficiency performance of a pump over a wide range of displacement conditions is crucially important for variable pump control systems to save energy. However, according to the literature, less attention has been paid to the understanding of the efficiency, leakage flow, and compression flow characteristics of the pump with respect to displacement conditions. In this study, a test bench was built, and a novel explicit volumetric loss model was proposed to investigate these problems. The overall efficiency is found to drop considerably with the decreasing displacement. The volumetric losses range from 13% to 47% of the total power losses of pump at the rated speed, under the conditions of pressure ranging from 5 to 35 MPa and displacement ranging from 13% to 100% of full displacement. The highest proportion of compression flow losses in the total volumetric losses of pump at the rated speed can reach up to 41% when the pressure and displacement are greater than 30 MPa and 88% of full displacement, respectively; after that, the proportion gradually decreases with decreasing displacement. However, the leakage flow generally increases with decreasing displacement, or may decrease first and begin to increase after the minimum with the further decrease of displacement. In the components of leakage of slipper/swash plate pair, the squeeze leakage is found to reach a magnitude equal to that of the Poiseuille leakage. The findings can guide the further research and design of pumps with better efficiency performance.

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Section: Simulation Modelingmentioning

confidence: 99%

Section: Components Analysis Of Leakage Flow Via the Gap Between Slipmentioning

confidence: 99%

Section: Components Analysis Of Leakage Flow Via the Gap Between Slipmentioning

confidence: 99%

Section: Variation Characteristics Of Volumetric Losses With Displacementioning

confidence: 99%

See 2 more Smart Citations

Characteristics of volumetric losses and efficiency of axial piston pump with respect to displacement conditions

Zhang

et al. 2016

JZUS-A

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“…This abrasion intensifies the slipper tilting and accelerates this abrasion furthermore and consequently the slipper leakage will increase. In order to improve pump efficiency, optimization of the slope on the sealing belt inner edge is recommended [11].…”

Section: Swashplate-slipper Pairmentioning

confidence: 99%

Computer Aided Design of Axial Piston Machines Having a Roller Piston Bearing

Elashmawy¹

2015

IJMEA

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Swashplate axial piston machines are simple, compact and low price. This simplicity is at the expense of piston transverse forces which limits machine characteristics. The aim of this study is to propose more effective developed design using roller piston bearing. Ball bearing was proposed to reduce transverse forces acting on the piston end of the axial piston machines. The proposed roller bearing design will provide line contact bearing between roller and cam contour compared to point contact of ball bearing arrangement. The roller runs on a flat surface contour formed on the swashplate which is simpler in manufacturing process. The sliding friction between swashplate and slipper is replaced by a rolling friction between roller and runway of cam surface contour. Results show the feasibility of the developed design. The proposed design promises to increase the pressure limitation of the ball bearing arrangement. Parameters such as piston displacement, cam action angle are the same for both roller and ball piston bearing. A comparison analysis was also performed between two alternative cam contours, sinusoidal and linear piston displacement. The selection criterion was based on piston transverse torque. Results show that sinusoidal piston displacement is much better choice than the linear one.

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Lubrication characteristics analysis of slipper bearing in axial piston pump considering thermal effect

Tang

Yin

2015

Lubr. Sci.

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In this study, the lubrication characteristics of a slipper bearing for axial piston pump considering oil thermal effect have been investigated. A mathematical model is developed to predict the film thickness and temperature on the slipper/swash plate interface under different operating conditions. Based on the mathematical model, a parametric study is conducted to evaluate the slipper lubrication performance. It is found that the slipper is characterised by an unstable behaviour and the behaviour is enhanced by lower pressure and higher rotational speed. As the film temperature increases rapidly due to high shaft speed and piston chamber pressure, the overall result is a rather low decline in the film thickness. The leakage flow rate increases with increasing speed or oil film thickness. The structure parameter can be optimised to obtain satisfactory slipper performance. Copyright © 2015 John Wiley & Sons, Ltd.

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Investigation on structural optimization of anti-overturning slipper of axial piston pump

Cited by 52 publications

References 5 publications

Characteristics of volumetric losses and efficiency of axial piston pump with respect to displacement conditions

Characteristics of volumetric losses and efficiency of axial piston pump with respect to displacement conditions

Computer Aided Design of Axial Piston Machines Having a Roller Piston Bearing

Lubrication characteristics analysis of slipper bearing in axial piston pump considering thermal effect

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