In this paper, the main objective is to determine the mechanical responses due to the axial forces on thrust bearing for an automotive turbocharger. The rotating shaft in a turbocharger is supported by the bearings, usually oil-lubricated radial journal bearings and a thrust bearing. The axial forces acting on the thrust bearing have significant influences on the mechanical friction losses, which reduces the efficiency and performance of high-speed turbocharger. There are simple well-known formulas such as Petroff’s equation for calculating the mechanical frictional losses in these types of bearings. However, it's difficult to estimate the accurate axial forces from this formula. Thus, this work determined the relationship between thrust forces and strains by measuring and calculating the strains on thrust bearing and compared both results. The result shown that behaviors of axial strain are changed linear and non-linear depend on the boundary condition. Therefore, it’s possible to predict the magnitudes of the axial forces by measuring the strains under operating turbocharger.

1. 서 론
 2. 축계 구성요소
 3. 터보차저 축계의 축방향 거동특성
  3.1 스러스트 베어링 구조
  3.2 변형률 측정 결과
 4. 유한요소 해석
  4.1 유한요소 모델
  4.2 유한요소 해석결과
 5. 결 론
 References

• 이인범(Member, Keyyang Precision R&D center) | I. B. LEE Corresponding author
• 홍성기(Gangneung- Wonju National University) | S. K . H ong
• 최복록(Gangneung- Wonju National University) | B. L. CHOI