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http://dx.doi.org/10.5762/KAIS.2018.19.7.9

Measurement of Journal Bearing Friction Loss of Turbocharger in a Passenger Vehicle  

Chung, in-Eun (Dept. of Mechanical Engineering, Korea Univ. of Technology and Education)
Jeon, Se-Hun (Dept. of Mechanical Engineering, Graduate School, Korea Univ. of Technology and Education)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.19, no.7, 2018 , pp. 9-15 More about this Journal
Abstract
The turbochargers, which are used widely in diesel and gasoline engines, are an effective device to reduce fuel consumption and emissions. On the other hand, turbo-lag is one of the main problems of a turbocharger. Bearing friction losses is a major cause of turbo lag and is particularly intense in the lower speed range of the engine. Current turbochargers are mostly equipped with floating bearings: two journal bearings and one thrust bearing. This study focused on the bearing friction at the lower speed range and the experimental equipment was established with a drive-motor, load-cell, magnetic coupling, and oil control system. Finally, the friction losses of turbochargers were measured considering the influence of the rotating speed from 30,000rpm to 90,000rpm, oil temperature from $50^{\circ}C$ to $100^{\circ}C$, and oil supply pressure of 3bar and 4bar. The friction power losses were increased exponentially to 1.6 when the turbocharger speed was increased. Friction torques decreased with increasing oil temperature and increased with increasing oil pressure. Therefore, the oil temperature and pressure must be maintained at appropriate levels.
Keywords
Friction loss; Journal bearing; Load cell; Thrust bearing; Turbocharger; Turbo lag;
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