An Experimental Study of Transient Thermal Effects in a Plain Journal Bearing

[+] Author and Article Information
B. Kucinschi

Universitatea Politehnica Bucuresti, Facultatea Inginerie Mecanica, Catedra Organe de Masini si Tribologie, 313, Spl. Independentei, sect. 6, Bucuresti 77206, Romania

M. Fillon

Laboratoire de Mécanique des Solides, UMR CNRS 6610, S.P.2M.I., BP 179, 86960 Futuroscope cedex, France

J. Tribol 121(2), 327-332 (Apr 01, 1999) (6 pages) doi:10.1115/1.2833940 History: Received February 02, 1998; Revised June 03, 1998; Online January 24, 2008


The present study deals with the experimental determination of temperature distribution in a plain, steadily loaded journal bearing, during transient thermal periods such as start-up or slow changing in velocity. A number of chromel-alumel thermocouples, placed circumferentially in the median section of the bearing, are used in order to carry out the measurements. The temperature at film-shaft interface is also measured by means of a chromel-alumel thermocouple and a mercury transmitter. The effects of journal speed and load on bearing temperature and fluid friction torque are analyzed. The bearing temperature increases considerably with the increase of rotational speed. In addition, for slight bearing loads the bearing temperatures are greater than for higher loads, due to the oil recirculation. The fluid friction torque increases at start-up and afterwards tends to decrease because of the temperature rise which decreases the oil viscosity.

Copyright © 1999 by The American Society of Mechanical Engineers
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