The wastegate valve regulates the maximum boost pressure inside the turbocharger to prevent damage to the engine and turbocharger which can occur from overload. However, even though the opening and closing behaviors of the valve should be controlled accurately, thermal deformations of the turbocharger system can lead to excessive distortion of the actuator rod, which can have a significant effect on the turbocharger performance. In this study, thermal deformation analysis of the turbocharger assembly has been analyzed through finite element analysis under operation condition. The result shows that the deformation in the turbine housing is relatively large and actuator rod is bent by thermal load. It causes rotational deformation at the wastegate valve face connected to the rod. And it is efficient to increase the stiffness of the EWGA rod to minimize the rotational deformation of the valve face. It means that the actuator rod should be placed in a position close to the center of the turbocharger to minimize the length of the rod that has the greatest effect on stiffness enhancement.

ABSTRACT
 1. 서 론
 2. EWGA 구조와 유한요소 모델
  2.1 EWGA Linkage 구조
  2.2 유한요소 모델
 3. 유한요소 해석결과
  3.1 운전조건 하에서의 터보차저 계 온도분포
  3.2 터보차저와 EWGA 링키지 변형
  3.3 설계인자들의 영향 분석
 4. 결 론
 References

• 홍성기(Keyyang Precision R&D Center) | S. K. HONG
• 최복록(Gangneung-Wonju National University School of Mechanical & Automotive Engineering) | B. L. CHOI Corresponding Author