scholarly journals Characteristics of Fluid Films Between a Valve Plate and a Cylinder Block of Axial Piston Pumps and Motors

1984 ◽  
Vol 15 (4) ◽  
pp. 314-321 ◽  
Author(s):  
Atushi Yamaguchi ◽  
Yasuo Fujitani ◽  
Yukio Isoda ◽  
Seiji Shimizu
Keyword(s):  
Valve Plate ◽  
Cylinder Block ◽  
Fluid Films ◽  
Axial Piston Pumps ◽  
Axial Piston

An Approach to Visualize Lifetime Limiting Factors in the Cylinder Block/Valve Plate Gap in Axial Piston Pumps

2017 ◽  
Author(s):  
Roman Ivantysyn ◽  
Ahmed Shorbagy ◽  
Jürgen Weber
Keyword(s):  
State Of The Art ◽  
Operating Conditions ◽  
Valve Plate ◽  
Limiting Factors ◽  
Cylinder Block ◽  
Axial Piston Pumps ◽  
First Results ◽  
Gap Height ◽  
Axial Piston ◽  
External Loads

The lifetime of axial piston pumps is depending on the application and it’s overall robustness to external loads, but even in ideal conditions pumps will fail eventually. The analytics to this problem are known to pump manufacturers. Bearing and shaft calculations paired with FEM models are invaluable tools, however the main questions remain with the rotating kit – cylinder block, pistons, and slippers. If properly designed these parts should theoretically outlast the finite lifetime parts, such as roller bearings due to their hydrostatic and hydrodynamic bearings. In reality however failures still occur due to fatigue or other factors such as contamination or wear. This paper describes an approach for the thermal analysis of the cylinder block / valve plate sealing interface. Using a state of the art test rig the temperature distribution, instantaneous gap height as well as particle wear have been analyzed across the entire operating range of an axial piston pump at the block / valve plate sealing interface. Simulations are done with cooperation of Purdue University by using their developed gap simulation model called Caspar FSTI. These simulations along with the measurements are used to locate potential lifetime reducing operating conditions and analyze them. The first results of the thermal behavior of this interface will be presented in this paper.

scholarly journals A new dynamic seven-stage model for thickness prediction of the film between valve plate and cylinder block in axial piston pumps

2016 ◽  
Vol 8 (9) ◽  
pp. 168781401667144 ◽  
Author(s):  
Chao Zhang ◽  
Shaokang Huang ◽  
Jun Du ◽  
Xingjian Wang ◽  
Shaoping Wang ◽  
...  
Keyword(s):  
Valve Plate ◽  
Cylinder Block ◽  
Stage Model ◽  
Axial Piston Pumps ◽  
Thickness Prediction ◽  
Axial Piston

A partial lubrication model between valve plate and cylinder block in axial piston pumps

2015 ◽  
Vol 229 (17) ◽  
pp. 3201-3217 ◽  
Author(s):  
Lei Han ◽  
Shaoping Wang ◽  
Chao Zhang
Keyword(s):  
Film Thickness ◽  
Reynolds Equation ◽  
Multiple Scales ◽  
Valve Plate ◽  
Cylinder Block ◽  
Height Distribution ◽  
Axial Piston Pumps ◽  
Surface Profiles ◽  
Axial Piston ◽  
Lubrication Conditions

Axial piston hydraulic pumps are commonly used in aircraft, which makes analysis of their lubrication conditions of significant importance. Oil film between valve plate and cylinder block plays an most important role in pump lubrication. This paper proposes a partial lubrication model of the contact surfaces between valve plate and cylinder block in axial piston pumps for predicting film thickness. The asperity curvature at multiple scales and height distribution are obtained by analyzing actual contact surface profiles, then the separating pressure of asperities is estimated by the Hertz theory and the fluid separating pressure is calculated by Reynolds equation. Experimental results indicate that this model can predict film thickness accurately.

“Transparent Pump”: An Approach to Visualize Lifetime Limiting Factors in Axial Piston Pumps

2016 ◽  
Author(s):  
Roman Ivantysyn ◽  
Jürgen Weber
Keyword(s):  
Pressure Sensors ◽  
Transitional Zone ◽  
Operating Conditions ◽  
Valve Plate ◽  
Limiting Factors ◽  
Cylinder Block ◽  
Axial Piston Pumps ◽  
Critical Areas ◽  
First Results ◽  
Axial Piston

The lifetime of axial piston pumps is depending on the application and it’s overall robustness to external loads, but even in ideal conditions pumps will fail eventually. The analytics to this problem are known to pump manufacturers. Bearing and shaft calculations paired with FEM models are invaluable tools, however the main questions remain with the rotating kit — cylinder block, piston, and slippers. If properly designed these parts should theoretically outlast the finite lifetime parts, such as roller bearings due to their hydrostatic and hydrodynamic bearings. In reality however failures still occur due to fatigue or other factors such as contamination or wear. This paper describes the approach to measure and quantify the physical effects that occur in the lubricating gaps of axial pumps by means of simulation and measurements. Simulations are done with cooperation of Purdue University and the Caspar FSTI tool. These simulations are used to locate potential lifetime affecting areas and analyze them. The analysis includes temperature and pressure distributions in the gap with changing operating conditions and studies of the influence of wear and deformation on the parts that are forming the lubricating gaps. After the most critical areas are located within the simulation environment, gap and temperature sensors are placed right at these critical locations. This is planned at two of the three main lubricating gaps — slipper and swash plate as well as cylinder block and valve plate. In addition pressure sensors are placed within many critical areas of the pump, such as the transitional zone between high pressure and low pressure on the valve plate, as well as in the displacement chamber. The first results for the slipper/swashplate investigation of this approach will be shown in this paper.

scholarly journals Novel design of hydrodynamic–magnetic compound support for cylinder block–valve plate in axial piston pump

AIP Advances ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 115221
Author(s):  
Jihai Jiang ◽  
Boran Du ◽  
Jian Zhang ◽  
Geqiang Li
Keyword(s):  
Valve Plate ◽  
Piston Pump ◽  
Cylinder Block ◽  
Axial Piston Pump ◽  
Axial Piston ◽  
Novel Design
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