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research-article

ON THE INFLUENCE OF LUBRICANT SUPPLY CONDITIONS AND BEARING CONFIGURATION ON THE PERFORMANCE OF (SEMI) FLOATING RING BEARING SYSTEMS FOR TURBOCHARGERS

[+] Author and Article Information
Luis San Andres

Mast-Childs Chair Professor, ASME Fellow, Mechanical Engineering Department, Texas A&M University, College Station, Texas 77843, USA
lsanandres@tamu.edu

Feng Yu

Product Line Engineer, Honghua America, LLC, Houston, Texas, USA, Research Assistant at Texas A&M University
whyufeng@gmail.com

Kostandin Gjika

Honeywell Transportation Systems, Thaon-les-Vosges, France
kostandin.gjika@honeywell.com

1Corresponding author.

ASME doi:10.1115/1.4037920 History: Received July 05, 2017; Revised July 25, 2017

Abstract

Engine oil lubricated (semi) floating ring bearing (S)FRB systems in passenger vehicle turbochargers (TC) operate at temperatures well above ambient and must withstand large temperature gradients that can lead to severe thermo-mechanical induced stresses. Physical modeling of the thermal energy flow paths and an effective thermal management strategy are paramount to determine safe operating conditions ensuring the TC component mechanical integrity and the robustness of its bearing system. The paper details a model to predict the pressure and temperature fields and the distribution of thermal energy flows in a bearing system. The impact of lubricant supply conditions, bearing film clearances, and oil supply grooves is quantified. Either a low oil temperature or a high supply pressure increases the generated shear power. A high supply pressure or a large clearance allow more flow through the inner film and draws more heat from the hot journal, yet raises the shear drag power as the oil viscosity remains high. Nonetheless, the peak temperature of the inner film is not influenced by the changes on the way the oil is supplied into the film as the thermal energy displaced from the hot shaft into the film is overwhelming. Adding axial grooves on the inner side of the (S)FRB improves its dynamic stability, albeit increasing the drawn oil flow as well as the drag power and heat from the shaft. The results identify a compromise between different parameters of groove designs thus enabling a bearing system with a low power consumption.

Copyright (c) 2017 by ASME
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