Technical Briefs

Lubricated Hybrid Journal Bearings

[+] Author and Article Information
Roberto Bassani

Department of Mechanical, Nuclear and Production Engineering,  University of Pisa, Via Diotisalvi 2, Pisa 56122, Italy

J. Tribol 133(3), 034501 (Jun 17, 2011) (5 pages) doi:10.1115/1.4002875 History: Received February 16, 2010; Revised October 15, 2010; Published June 17, 2011; Online June 17, 2011

This chapter deals with a hydrodynamic journal bearing provided with hollow bushings, capable of supporting very high loads, even at low speeds, at which separation between the shaft and the housing’s bushing is induced by a specific self-regulating hydrostatic system. The same amount of lubricant can be used for both hydrostatic and hydrodynamic lubrication, thereby facilitating transition between the two. This hybrid bearing can be used in several applications.

Copyright © 2011 by American Society of Mechanical Engineers
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Figure 1

Journal bearing: schematic outline

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Figure 2

Journal bearing: (a1 ) minimum film thickness and eccentricity, (a2 ) lubricant flow rate, and (a3 ) coefficient of friction versus the Sommerfeld number, for some values of the length ratio

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Figure 3

Journal bearings with hydrostatic lift recesses: (a1 ) and (a2 ) schematic outlines, (b) load-carrying capacity, (c) pressure in the recess versus eccentricity, for some types of recess

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Figure 4

Compact hydrodynamic journal bearing with hollow bushings: schematic outline

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Figure 5

Double direction hydrostatic thrust bearings: (a) Self-regulating bearing (b) Load-carrying capacity versus eccentricity ratio

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Figure 6

Compact hydrodynamic journal bearing with self-regulating hydrostatic lift

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Figure 7

Self-regulating hydrostatic lift: (a) comparison between circular and rectangular pads and (b) radius ratios of the circular pad versus threshold length of the rectangular pad



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