Effect of Valve Train Layout on Cam/Tappet Wear Characteristics of End Pivot Rocker Arm Type OHC Valve Train

끝단 지지 로커암형 오버 헤드 밸브트레인의 캠/종동자 마모 특성에 미치는 밸브트레인 레이아웃의 영향

  • Published : 2001.07.01

Abstract

Cam/tappet wear is one of the critical concerns in valve train deign. Maximum contact stress and minimum oil film thickness between the cam and tappet are usually checked for the estimation of wear characteristics. If the two extreme cases arise simultaneously, there is a strong possibility of cam/tappet wear. In this paper, effects of valve train layout on the wear characteristics were studied. Especially for swinging arm type valve trains, initial geometric layout must be very carefully defined to avoid wear problems. The study was performed fur an end pivot type OHC valve train, which had severe wear problems. Analysis results show that some geometric parameter affect very sensitively on the wear characteristics. Experiments were also performed for the original and modified valve trains, which strongly support the analysis results.

Keywords

References

  1. SAE 770018 Elasto-hydrodynamic Lubricationand Wear of Cams Bearing Against Cylindrical Tappets A.Dyson
  2. Tribology International Kinematics and Wear Patterns of Cam and Finger Follower Automotive Valve Gear A.Dyson
  3. Motor Tech. Z. The Effect of Lubrication on Cam and Tappet Performance R.Muller
  4. SAE 901728 A Process to Predict Friction in an Automotive Valve Train M.E.Crane;R.C.Meyer
  5. SAE 830165 An Analysis of Valve Train Friction in Terms of Lubrication Principles J.T.Staron;P.A.Willermet
  6. FISITA, F2000A168 Analysis of Transient Minimum Film Thickness in Cam and Flat Follower S.Jang
  7. 한국자동차공학회 춘계학술대회 논문집 직동식 밸브트레인 시스템의 캠/종동자 접촉부의 혼합 윤활 해석 신흥주;조명래;한동철
  8. Automobile Engine Lubrication A.Schilling