Eccentric operation of conical hydrostatic thrust bearings
TL;DR: A theoretical study of the behavior of capillary-compensated annular recess conical hydrostatic thrust bearings under conditions of eccentricity and rotation is reported in this paper, where the influence of aspect ratios, cone angles and resistance ratios on the static and dynamic characteristics is discussed.
About: This article is published in Wear.The article was published on 1983-06-01. It has received 9 citations till now. The article focuses on the topics: Thrust bearing & Conical surface.
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TL;DR: In this paper, the load-carrying capacity, power losses and stiffness of disk-type hydrostatic thrust bearings including the case of eccentric loading are discussed theoretically based on a two-dimensional elastohydrostatic problem with an elastic deformation model, which is extended to adapt it for a non-axisymmetric load acting on the thrust bearing.
35 citations
TL;DR: In this article, the influence of the tilt and recess shape on the static and dynamic performance characteristics of the hydrostatic thrust pad bearing system having Rabinowitsch fluid model lubricant was numerically analyzed.
35 citations
TL;DR: In this paper, the static characteristics of water-lubricated hydrostatic conical bearings with spiral grooves were described and compared with experimental results. But the results were limited to high speed spindles.
Abstract: This paper describes the static characteristics of water-lubricated hydrostatic conical bearings with spiral grooves. Hydrostatic conical bearings treated here have been designed for high speed spindles and are intended to apply to spindles for drilling small holes of printed circuit-boards. Pressurized water is first fed to the inside of the rotating shaft and supplied to spiral grooves on the shaft surface through feeding holes. Therefore, water pressure is greatly increased at outlets of feeding holes due to the centrifugal force by shaft rotation. Furthermore, water pressure is also increased by the viscous pump effect of spiral grooves. Water pressures in the bearings under concentric condition are numerically obtained by using the finite element method and calculated results are compared with experimental ones. It is consequently found that this water-lubricated hydrostatic conical bearings with spiral grooves are very suitable for precision high speed spindles.
27 citations
TL;DR: In this paper, a theoretical analysis of a 4 pocket capillary compensated conical hybrid journal bearing system operating with micropolar lubricant has been carried out for different values of micropolastic parameters, that is, characteristic length and coupling number.
Abstract: The present paper deals with a theoretical analysis of 4-pocket capillary compensated conical hybrid journal bearing system operating with micropolar lubricant. The modified Reynolds equation for a conical journal bearing system operating with micropolar lubricant has been derived. In the present study, Eringen's micropolar theory has been used to model micropolar lubrication in cylindrical coordinate system. The study has been carried out for the different values of micropolar parameters, that is, characteristic length () and coupling number (). The conical bearing configurations having semicone angle 10∘, 20∘, 30∘, and 40∘ have been studied. The study suggests that micropolar lubricant offers better performance vis- a-vis Newtonian lubricant for bearing configurations having values of semicone angle 10∘and 20∘.
20 citations
Cites background from "Eccentric operation of conical hydr..."
...[7] T. J. Prabhu and N. Ganesan, “Finite element application to the study of hydrostatic thrust bearings,” Wear, vol. 97, no. 2, pp. 139–154, 1984....
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...Prabhu and Ganesan [4, 6, 7] analyzed the dynamic stiffness characteristics of capillary compensated annular recess conical hydrostatic thrust bearings....
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...[6] T. J. Prabhu and N. Ganesan, “Theoretical analysis of the dynamic stiffness of conical hydrostatic thrust bearings under tilt, eccentricity and rotation,” Wear, vol. 91, no. 2, pp. 149– 159, 1983....
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...[4] T. J. Prabhu and N. Ganesan, “Eccentric operation of conical hydrostatic thrust bearings,” Wear, vol. 87, no. 3, pp. 273–285, 1983....
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TL;DR: In this article, the influence of micro-texture with different shapes used on the bearing surface is studied and a parametric study is carried out to optimize the dimple attributes on the basis of radial load.
18 citations
References
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TL;DR: In this paper, a theoretical study of the characteristics of a multipad plane hydrostatic thrust bearing was made taking into account the effect of rotational lubricant inertia, and design data for the load capacity, flow and stiffness and damping characteristics were obtained for practically useful radius and resistance ratios for capillary and orifice compensation.
28 citations
19 citations
01 Jun 1970
TL;DR: An experimental and theoretical investigation was carried out into the effects of tilt on the operation of circular hydrostatic thrust pads, the results of which show that the characteristics of a tilted pad can be reliably predicted, assuming the lubricant to be isoviscous as mentioned in this paper.
Abstract: The majority of hydrostatic thrust bearings are designed on the assumption that the bearing surfaces are parallel but, with the possibility of manufacturing and assembly errors and structural deformations, this condition is rarely, if ever, achieved in practice. With the increasing demands being made in modern machinery, more detailed design information is required.An experimental and theoretical investigation was carried out into the effects of tilt on the operation of circular hydrostatic thrust pads, the results of which show that, for static conditions, the characteristics of a tilted pad can be reliably predicted, assuming the lubricant to be isoviscous. With this information, a thrust pad can be designed to operate in any specified tilted configuration or can be incorporated in a rigorous structural design. In many applications, however, it may be difficult to specify the tilt and in such situations it is more useful for the designer to have some indication of how the operating conditions may be mod...
14 citations
TL;DR: In this paper, the effect of tilt on the performance characteristics of a bearing is investigated and a semianalytical solution of the pressure equation is used to find the characteristic values of the bearing are found to be strong functions of the tilt parameter and the bearing number.
14 citations
TL;DR: In this paper, a semi-analytical solution was presented to obtain the pressure distribution, the load capacity, the frictional moment and the lubricant flow rate for a laminar flow, hydrostatic bearing with its axis offset from the rotation axis of the saw blade.
12 citations