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Optimum Design of Teeth Shapes of Rotating Serration and Spline-type Torque Converter Parts Operating in a High Temperature Fluids

고온에서 맞물려 회전하는 토크컨버터 부품간 열 및 토크를 고려한 치형상의 최적설계

  • Lee, Dong-uk (School of Mechanical Engineering, Kyungpook Nat'l Univ.) ;
  • Kim, Cheol (School of Mechanical Engineering, Kyungpook Nat'l Univ.) ;
  • Kim, Jungjun (Korea Powertrain Co., LTD., R & D Center) ;
  • Shin, Sooncheol (Korea Powertrain Co., LTD., R & D Center)
  • 이동욱 (경북대학교 기계공학부) ;
  • 김철 (경북대학교 기계공학부) ;
  • 김정준 (한국파워트레인(주) 기술연구소) ;
  • 신순철 (한국파워트레인(주) 기술연구소)
  • Received : 2017.05.31
  • Accepted : 2017.07.18
  • Published : 2017.11.01

Abstract

The tooth shapes of serration-type and spline-type reactors are optimized using finite element methods to improve the working life of the part and to lower the stress concentration during rotation resulting from contact with the outer race for a reactor operating with $170^{\circ}C$ transmission oil. The results of thermal expansion analyses between an Al reactor and the steel outer race indicate that, before optimization, the gap between the two parts increases further as the serration-type reactor expands by 0.1 mm and the spline-type one strains by 0.08 mm. Because of shape optimization, a trapezoidal shape is obtained from the initial triangular serration and the rectangular spline of the two reactors. The maximum von Mises stress of the serration-type convertor decreased by 24.5 %, and by 9.3 % for the spline-type convertor. In addition, there is a 13 % reduction in the axial thickness, as compared to the initially designed model.

$170^{\circ}C$의 고온에서 작동하는 자동변속기 토크컨버터의 리액터와 끝단 레이스 두 부품간 이빨이 서로 맞닿는 부분의 응력을 분산시키고, 수명을 증가시키기 위하여 치(이빨), 스플라인 두 형태의 리액터의 치형상을 FEM 최적화하였다. 최적화에 선행하여 서로 다른 재료로 된 두 부품의 열팽창에 의한 간격을 해석하였으며, 그 결과 열팽창 후에 치형 리액터는 약 0.1 mm, 스플라인형 리액터는 약 0.08 mm의 추가 간격이 발생한다는 것을 확인하였다. 형상최적화 결과 두 가지 형태의 리액터 치가 모두 비대칭 사다리꼴 형상으로 최적화 되었다. 이로 인해 치형 리액터의 경우 기존 비최적화 모델 대비, 최대등가응력이 24.5 % 감소하였으며, 스플라인형 리액터는 기존 비최적화 모델 대비 최대등가응력은 9.3 % 감소하였으며, 축 방향 두께는 13 % 감소하였다.

Keywords

References

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