DEVELOPMENT OF A VARIABLE GEOMETRY TURBOCHARGER THRUST BEARING

Open Access
Author:
Longacre, Christian Charles
Area of Honors:
Mechanical Engineering
Degree:
Bachelor of Science
Document Type:
Thesis
Thesis Supervisors:
  • Liming Chang, Thesis Supervisor
  • Zoubeida Ounaies, Honors Advisor
Keywords:
  • tribology
  • thrust bearing
  • turbocharger
Abstract:
Turbocharging is an effective way to increase power, decrease emissions, and improve efficiency in modern diesel engines. In recent years the demand for increased engine performance and decreased emissions, driven by customers and the federal government respectively, has continually spurred the development of more efficient turbochargers. This honors thesis presents a variable pad geometry turbocharger thrust bearing. The design mimics the behavior of a common pivot-pad thrust bearing, replacing the pivot with a deflecting cantilever. The variable pad geometry thrust bearing was developed and tested with BorgWarner Turbo Systems in Arden, NC. Test results showed improved thrust load capacity and power loss characteristics compared to baseline tests conducted with current taperland thrust bearings. The design process, testing methods and results, analysis of bearing performance, and suggestions for further development are included.