Volume 7, Issue 4, August 2019, Page: 111-122
Design of Self-restriction Hydrostatic Thrust Spherical Bearing (Fitted Type)
Ahmad Waguih Yacout Elescandarany, Mechanical Department, Faculty of Engineering, Alexandria University, Alexandria, Egypt
Received: Aug. 14, 2019;       Accepted: Sep. 4, 2019;       Published: Sep. 20, 2019
DOI: 10.11648/j.ijmea.20190704.14      View  109      Downloads  80
Abstract
This is the last part of the series studying the fitted hydrostatic thrust spherical bearing. It handles an unconventional design of this type of bearings. The conception of this design is to break the rules controlling the bearing restrictions, where it is believed that without restrictors no hydrostatic bearing could be got (axiom). The paper focused the effort to derive a general characteristic equation that can control the design in turn the bearing performance and behavior. This general characteristic equation, through its simple form, gives the designer the ability to get a comprehensive conception about his problem and widely opens the door in front of him to design a conventional or unconventional bearing whatever the bearing purpose. The effective parameters; needed to be known for designing the bearing; were concentrated into three items; the rotor speed, the seat dimensions and the lubricant properties. The characteristic equation shows that the seat radius and the inlet angle play the major role in determining the supply pressure, in turn the load carrying capacity. The inertia, the recess angle and the lubricant viscosity have the major effect on determining the bearing stiffness in case of the partial hemispherical seats while in case of the hemispherical seats the stiffness has slightly been affected. The design shows that the bearings with hemispherical seats have extremely low stiffness, practically zero stiffness and very high temperature rise, which make this bearing configuration invalid to be self restriction bearing; while the bearings with partial hemispherical seats have a very wide stiffness range allowing the designer to control and design the bearing with the stiffness needed for any purpose (from zero stiffness to extremely high stiffness). The lubricant temperature rises about three degrees centigrade which practically means that the bearing operates at constant temperature.
Keywords
Hydrostatic Bearings, Spherical Bearings Design, Surface Roughness, Inertia, Viscosity Effects, Self Compensation
To cite this article
Ahmad Waguih Yacout Elescandarany, Design of Self-restriction Hydrostatic Thrust Spherical Bearing (Fitted Type), International Journal of Mechanical Engineering and Applications. Vol. 7, No. 4, 2019, pp. 111-122. doi: 10.11648/j.ijmea.20190704.14
Copyright
Copyright © 2019 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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