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TECHNICAL PAPERS

# Experimental Investigation of the Influence of Supply Temperature and Supply Pressure on the Performance of a Two-Axial Groove Hydrodynamic Journal Bearing

[+] Author and Article Information
F. P. Brito, A. S. Miranda

Mechanical Engineering Department, University of Minho, 4810 Guimarães, Portugal

J. Bouyer, M. Fillon

Laboratoire de Mécanique des Solides, University of Poitiers, U.M.R. C.N.R.S. 6610, SP2MI, BP 30179, 86962 Futuroscope cedex, France

J. Tribol 129(1), 98-105 (Jun 23, 2006) (8 pages) doi:10.1115/1.2401206 History: Received March 15, 2006; Revised June 23, 2006

## Abstract

An experimental study of the influence of oil supply temperature and supply pressure on the performance of a $100mm$ plain journal bearing with two axial grooves located at $±90deg$ to the load line was carried out. The hydrodynamic pressure at the mid-plane of the bearing, temperature profiles at the oil-bush and oil-shaft interfaces, bush torque, oil flow rate, and the position of the shaft were measured for variable operating conditions. Shaft rotational speed ranged from $1000$ to $4000rpm$ and two different values of applied load were tested (2 and $10kN$). The supply temperature ranged from $35$ to $50°C$, whereas the oil supply pressure range was $70$ to $210kPa$. Bearing performance is strongly dependent on the supply conditions. It was found that the existence of the downstream groove significantly affects the temperature profile at the oil-bush interface except for the low load, low feeding pressure cases, where the cooling effect of the upstream groove is significant. Feeding temperature has a strong effect on the minimum film thickness. The increase in maximum temperature is significantly lower than the corresponding increase in supply temperature. Increases in supply pressure lead to a significant rise in oil flow rate but have little effect on the maximum temperature and power-loss, except in the case of the lightly loaded bearing. Shaft temperature was found to be close to the bearing maximum temperature for low applied loads, being significantly smaller than this value for high loads. The mean shaft temperature is only significantly higher than the outlet temperature at high shaft speeds.

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## Figures

Figure 3

Angular location of the thermocouples (⊞) and pressure holes (☉) at the inner surface of the bush.

Figure 4

Detail of the proximity probe system

Figure 6

Locus of the shaft center in relation to the bush center (W=10kN; Tf=40°C)

Figure 7

Influence of speed and supply pressure on power loss for (a) W=2kN, (b) W=10kN(Tf=40°C)

Figure 8

Influence of supply pressure on oil flow rate for variable rotational speed and applied load (Tf=40°C)

Figure 9

Influence of the supply pressure on the temperature profile at the mid-plane of the bush-film interface, for a load of (a) 2kN and (b) 10kN (N=4000rpm; Tf=40°C)

Figure 10

Influence of the oil supply pressure on (a) the maximum temperature at the bush-film interface, (b) the mean shaft-film interface temperature, and (c) the oil outlet temperature (Tf=40°C)

Figure 11

Influence of the supply temperature on the pressure profiles at the mid-plane of the bearing for (a) N=1000rpm and (b) N=4000rpm (W=10kN; Pf=140kPa)

Figure 12

Locus of the shaft center in relation to the bush center (W=10kN; Pf=140kPa)

Figure 13

Influence of oil supply temperature in oil flow rate (Pf=140kPa)

Figure 14

Influence of oil supply temperature on power loss for an applied load of (a) 2kN and (b) 10kN load (Pf=140kPa)

Figure 15

Temperature profiles at the mid-plane of the bush-film interface for three different supply temperatures with (a) W=2kN, N=4000rpm, (b) W=10kN, N=1000rpm, and (c) W=10kN, N=4000rpm(Pf=140kPa)

Figure 16

Influence of oil supply temperature on (a) the mean shaft-film interface temperature and (b) the oil outlet temperature (Pf=140kPa)

Figure 1

Test rig

Figure 2

3D drawing of the inner part of the bush

Figure 5

Pressure profiles for (a) 10kN, 4000rpm tests, (b) 2kN, 4000rpm tests, and (c) maximum pressure values (Tf=40°C)

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