Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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Optimal Location Issue on both Supporting Bearing and Unbalance Mass of the Balance Shaft Module in a Inline 4-Cylinder Engine

직렬 4기통 엔진용 밸런스 샤프트 모듈의 불평형 질량 및 베어링 위치 선정

  • 이동원 (자동차부품연구원 ICE / EV구동융합연구센터) ;
  • 김찬중 (자동차부품연구원 ICE / EV구동융합연구센터) ;
  • 배철용 (자동차부품연구원 ICE / EV구동융합연구센터) ;
  • 이봉현 (자동차부품연구원 ICE / EV구동융합연구센터)
  • Received : 2009.01.12
  • Accepted : 2010.01.27
  • Published : 2010.07.01
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Abstract

Large quantity of bending deformation as well as irregular rotating torque fluctuation are the main struggles of the balance shaft module during a high speed rotation. Since two issues are much sensitive to the location of both supporting bearing and unbalance mass at a balance shaft, it is recommended to construct a design strategy on balance shaft at the early stage so as to save developing time and effort before approaches to the detailed design process. In this paper, an optimal design formulation is proposed to minimize the elastic strain energy due to bending as well as the kinematic energy of polar moment of inertia in rotation. Case studies of optimal design are conducted for different mass ratio as well as linear combination of objective function and its consequence reveals that global optimum of balance shaft model is existed over possible design conditions. Simulation shows that best locations of both supporting bearing and unbalance are globally 20% and 80%, respectively, over total length of a balance shaft.

Keywords

References

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