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롤러 프로파일링을 고려한 박용 디젤기관 캠-롤러사이의 탄성유체윤활해석
구영필,조용주 한국마린엔지니어링학회 2000 한국마린엔지니어링학회지 Vol.24 No.6
A numerical procedure to analyze 3-dimensional elastohydrodynamic lubrication was applied on the cam-roller contact of the valve mechanism for a marine diesel engine. Both the pressure distribution and the film thickness between the cam and roller follower were calculated for each time step of the whole cycle. The pressure spike is shown at the outlet of the roller edge and it is getting higher as the external load is increased. An effective profiling method for the roller edge was suggested using the results of elastohydrodynamic lubrication analysis and the peak pressure was removed completely with the new profiling.
Flash Temperature Analysis on the Contact Surfaces between Cam and Roller-Follower Mechanism
구영필,김민남,김남식,Koo, Young-Pil,Kim, Min-Nam,Kim, Nam-Shik The Korean Society of Manufacturing Process Engine 2004 한국기계가공학회지 Vol.3 No.2
The flash temperature distribution on the contact surfaces between cam and roller-follower mechanism was analysed numerically. The elasto-hydrodynamic lubrication pressure and film thickness were used to get the accurate analysis results. The temperature distribution was obtained by numerical integration by making use of Carslaw and Jaeger's formulation to the whole contact surfaces. The maximum flash temperature was increased with both the increasing slip ratio of the contact surface and increasing external load Profile of the temperature distribution was affected by the sliding velocity of the surface.
치면 프로파일 모델에 따른 기어 치면 내부의 응력 분포
구영필(Young-Pil Koo),김형자(Hyung-Ja Kim),김영대(Young-Dae Kim) 한국트라이볼로지학회 2003 한국트라이볼로지학회 학술대회 Vol.36 No.-
The sub-surface stress field beneath the gear's contacting surface due to the contact pressure in lubricated condition has been calculated. To evaluate consequence of the clearance shape on the stress field, two kinds of tooth profile models were chosen. One is conventional cylinder contact model and another is new numerical model. The Love's rectangular patch solution was used to obtain the sub-surface stress field. The maximum effective stress of the new model is lower than the one of the old model and the depth where the maximum effective stress occurs is shorter at high load.
[구조강도부문] 디젤기관 캠-롤러 접촉부의 표면아래 응력해석
구영필(Youngpil Koo),이문주(munju Lee),조용주(Youngjoo Cho) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this study, the subsurface stress field beneath the roller by fluid film pressure working on the roller surface has been calculated by using the rectangular patch solution. Main purpose of this study in view of engineering is to prove the validity of the profiling roller presented by Koo et al. Koo et al. obtained the fluid film pressure by EHL analysis of earn-roller mechanism. To prove the advantage of this study, we compared Koo's profiling with the existing Dub-off profiling roller. To obtain the subsurface stress field created by normal force, namely, fluid film pressure, Love's solution is used.