Mixed Lubrication Simulation of Hydrostatic Spherical Bearings for Hydraulic Piston Pumps and Motors

Mixed and fluid film lubrication characteristics of hydrostatic spherical bearings for swash-plate-type axial piston pumps and motors are studied theoretically under non-steady-state conditions. The basic equations incorporating interference and contact of surface roughness are derived fundamentally...

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Bibliographic Details
Published in:Journal of Advanced Mechanical Design, Systems, and Manufacturing Systems, and Manufacturing, 2008, Vol.2(1), pp.71-82
Main Author: KAZAMA, Toshiharu
Format: Article
Language:English
Subjects:
Ball Joint
Bearings
Caulking
Eccentricity
Fluid Power Systems
Hydraulic Piston Pumps and Motors
Hydrostatic Bearings
Hydrostatics
Lubrication
Mixed Lubrication
Motors
Piston pumps
Power loss
Simulation
Sockets
Sphere
Tribology
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Summary:Mixed and fluid film lubrication characteristics of hydrostatic spherical bearings for swash-plate-type axial piston pumps and motors are studied theoretically under non-steady-state conditions. The basic equations incorporating interference and contact of surface roughness are derived fundamentally through combination of the GW and PC models. Furthermore, a programming code that is applicable to the caulked-socket-type and open-socket-type bearings is developed. Effects of caulking, operating conditions, and the bearing dimension on the motion of the sphere and tribological performance of the bearings are examined. Salient conclusions are the following: The sphere's eccentricity increases in the low supply pressure period. The time-lag of the load change engenders greater motion of the sphere. Caulking of the bearing socket suppresses the sphere's motion. The bearing stiffness increases and power loss decreases for smaller recess angles. Minimum power loss is given under the condition that the bearing socket radius nearly equals the equivalent load radius.
ISSN:1881-3054
1881-3054
DOI:10.1299/jamdsm.2.71