Hydrostatic Bearing Characteristics Investigation of a Spherical Piston Pair with an Annular Orifice Damper in Spherical Pump

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.

Identifying the influence of design parameters of a hydrostatic bearing in an aircraft fuel pump on its static characteristics

“…An unconventional arrangement of load-bearing chambers on the working surface of a hydrostatic bearing is proposed. The above analysis of the influence of design parameters on the static characteristics of a hydrostatic bearing was not considered in [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. The results allow for a more rational design of hydrostatic bearings and show the possibility of their use in aircraft fuel pumps.…”

“…However, the work does not pay attention to the influence of lubricant flow turbulence on the bearing capacity. In [12], the characteristics of a hydrostatic bearing with an annular throttle damper in a spherical pump are considered. The article solves the basic Reynolds equation in spherical coordinates and studies the characteristics of a hydrostatic bearing.…”

“…In the literature [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15], there is no information on the study of the influence of the circumferential arrangement of load-bearing chambers on the working surface of a bearing on its load-bearing capacity and flow of working fluid. The influence of changes in the temperature of the working fluid at different positions of the load-bearing chambers in the bearing on its load-bearing capacity and fluid flow has also not been considered.…”