Abstract
The spherical pump is a totally new hydraulic concept, with spherical piston and hydrostatic bearing, in order to eliminate the direct contact between the piston and cylinder cover. In this paper, the governing Reynolds equation under spherical coordinates has been solved and the hydrostatic bearing characteristics are systematically investigated. The operating sensitivities of the proposed spherical hydrostatic bearing, with respect to the piston radius, film beginning angle, film ending angle, film thickness, and temperature, are studied. The load carrying capacity, pressure drop coefficient, stiffness variation of the lubricating films, leakage properties, and leakage flow rates are comprehensively discussed. The related findings provide a fundamental basis for designing the high-efficient spherical pump under multiple operating conditions. Besides, these related results and mechanisms can also be utilized to design and improve other kinds of annular orifice damper spherical hydraulic bearing systems.
Highlights
Coatings 2021, 11, 1007. https://The hydrostatic bearing consists of a fluid layer between two surfaces, whose purpose is to avoid direct surface-to-surface contact [1,2,3,4,5,6]
By using the continuity equation of incompressible, lubricating fluid, related expressions are derived for describing the load carrying capacity, pressure drop coefficient, stiffness variation of the lubricating film, leakage properties, the effect of temperature on leakage, and the flow rate of the leakage
The plot horizontal axis is the ratio between the piston pin diameter and the piston radius
Summary
The hydrostatic bearing consists of a fluid layer between two surfaces, whose purpose is to avoid direct surface-to-surface contact [1,2,3,4,5,6]. Pang et al [15] studied the hydrostatic lubrication of the slipper, in a high-pressure plunger pump, by considering the pressure-viscosity effects of the lubricating surface These authors investigated the dynamic stiffness properties of the oil film. The properties of disk-type hydrostatic thrust bearings supporting concentric loads, simulating the major bearing/seal parts of water hydraulic motors and pumps, are studied in [20] Both theoretical and experimental approaches are utilized, to investigate the relationships between film thickness, flow rate leakage, working pressure, and load carrying capacity. The power loss properties, stiffness, and load carrying capacities of the disk-type hydrostatic thrust bearings are analyzed theoretically in [21] Another related research was conducted by Hooke et al [25,26,27,28]. By using the continuity equation of incompressible, lubricating fluid, related expressions are derived for describing the load carrying capacity, pressure drop coefficient, stiffness variation of the lubricating film, leakage properties, the effect of temperature on leakage, and the flow rate of the leakage
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