scholarly journals A Study on Design of Notches in Valve Plate of Swash Plate Type Axial Piston Pumps Operated Bi-directionally

2016 ◽  
Vol 13 (3) ◽  
pp. 39-46
Author(s):  
Sae Ryung Choi ◽  
Ill Yeong Lee ◽  
Sung Min Han ◽  
Jung Woo Shin
Keyword(s):  
Valve Plate ◽  
Axial Piston Pumps ◽  
Swash Plate ◽  
Axial Piston ◽  
Plate Type

Advanced Virtual Prototyping of Axial Piston Machines

2016 ◽  
Author(s):  
Rene Chacon ◽  
Monika Ivantysynova
Keyword(s):  
Numerical Models ◽  
Virtual Prototyping ◽  
Valve Plate ◽  
Cylinder Block ◽  
Plate Interface ◽  
Design And Optimization ◽  
Swash Plate ◽  
Axial Piston Machine ◽  
Axial Piston ◽  
Plate Type

This paper explains how a combination of advanced multidomain numerical models can be employed to design an axial piston machine of swash plate type within a virtual prototyping environment. Examples for the design and optimization of the cylinder block/valve plate interface are presented.

Numerical Simulation of a Slipper Model for Swash Plate Type Axial Piston Pumps and Motors: Effects of Concave and Convex Surface Geometry

2012 ◽  
Vol 6 (4) ◽  
pp. 434-439 ◽  
Author(s):  
Toshiharu Kazama ◽  
◽  
Yukihito Narita
Keyword(s):  
Convex Surface ◽  
Sliding Surface ◽  
Surface Geometry ◽  
Axial Piston Pumps ◽  
Swash Plate ◽  
Convex Geometries ◽  
Thrust Pad ◽  
Axial Piston ◽  
Plate Type ◽  
Load Conditions

In this study, the slipper of swash plate axial piston pumps and motors is modeled as a hybrid (hydrostatic and hydrodynamic) thrust pad bearing. The effects of the slightly concave and convex geometries of the slipper sliding surface are examined. The motion of the slipper model is numerically simulated, and its tribological characteristics are examined under eccentric and dynamic load conditions. The calculations under these conditions indicate that, for the concave slipper, the fluctuation of the bearing pad azimuth increases, and the attitude of the slipper becomes unstable. In contrast, for the convex slipper, the attitude becomes stable, but the clearance increases.

Lubrication Analysis of the Thrust Bearing in the Valve Plate of a Swash-Plate Type Axial Piston

2011 ◽  
Author(s):  
J. H. Shin ◽  
H. E. Kim ◽  
K. W. Kim
Keyword(s):  
Thrust Bearing ◽  
Valve Plate ◽  
Time Dependent ◽  
Fluid Film ◽  
Simulation Tool ◽  
Film Pressure ◽  
Swash Plate ◽  
Cylinder Barrel ◽  
Axial Piston ◽  
Plate Type

This application study of a swash-plate type axial piston pump was concerned about the hydrostatic lubrication characteristics of cylinder barrel and valve plate which are main rotating body and its opposite moving part respectively. A computer simulation was implemented to assess thrust bearing and mechanical sealing functions of the fluid film between cylinder barrel and valve plate. A new algorithm was developed to facilitate simultaneous calculations of dynamic cylinder pressure, 3 degree-of-freedom barrel motions considering inertia effect, and fluid film pressure assuming full fluid film lubrication regime. Using the simulation tool, force and moment balancing of cylinder barrel which is a key issue of piston pump design was analyzed. Time dependent fluid film pressure and thickness distributions for several given balance ratios were calculated. This analysis helps to decide appropriate balance ratio in the valve and cylinder barrel. Oil leakage flow and friction torque in the fluid film between cylinder barrel and valve plate were calculated as well and discussed in the viewpoint of energy loss. The results show that film thickness in plain surface is not high enough to bear the barrel and reduce power loss and that surface waviness which exists in actual sliding surfaces can have a positive effect on it. This simulation tool could also predict time dependent barrel motions due to simultaneous calculation algorithm. It has been known that cylinder barrel rotates with oscillation. Therefore average clearance, tilt angle, and azimuth angle were calculated for each time step and the results were discussed.

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