• Title/Summary/Keyword: 자동차 실린더헤드

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Review of the Sealing on the Cylinder Head Gasket in the InternalCombustion Engine(1) (내연기관 실린더 헤드 가스켓의 밀봉에 관한 조사(1))

  • 오성환
    • Journal of the korean Society of Automotive Engineers
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    • v.7 no.4
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    • pp.9-17
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    • 1985
  • 엔진이 고성능화가 되어감에 따라 실린더 헤드 가스켓 재료나 밀봉(sealing) 구조가 계속해서 변 천되어 가고 있고 이는 엔진의 성능향상이 헤드 가스켓에 의해 크게 좌우된다는 것을 알려준다. 그러나 종래에는 헤드와 엔진보아(bore) 간의 밀봉문제가 가스켓만의 문제로 해서 검토하는 경우 가 많았다. 거기에다 검토 되어지는 것도 엔진의 개발 최종단계에서 이기 때문에 엔진을 개선할 수 없어 여러 가지 문제점을 가스켓이 부담하는 경우가 많았다. 그에 의한 무리한 대책은 나중 에 여러 가지 문제를 야기하는 결과를 가져다 준다. 그래서 여기서는 실린더 헤드 가스켓에 관 한 전반적인 내용을 서술하고자 한다.

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Steady Flow Characteristics of Four-Valve Cylinder Heads (실린더헤드 형상에 따른 정상유동 특성)

  • 배충식;정경석
    • Transactions of the Korean Society of Automotive Engineers
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    • v.4 no.5
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    • pp.197-205
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    • 1996
  • The flow characteristics of five different 4-valve cylinder heads were investigated in a steady flow rig using laser-Doppler velocimetry. The tumble flow of each head with pentroof combustion chamber was quantified by nondimensional tumble number using a tumble adaptor. The formation of tumbling vortex was examined in an optical single-cylinder engine which has windows for in-cylinder LDV measurements. Tumble vortex ratio was estimated from the tumble flow measurement. The four-valve cylinder heads with pent-roof combustion chamber showed the tumble vortex from the intake process, which was investigated in the steady flow test. The tumble adaptor which converts the tumble into swirl flow was found to be feasible in predicting the tumble flow in the real engine. The tumble strength in the steady flow test coincides with that in the real engine experiment within 15%. It was found that the steady flow test on the four-valve cylinder heads provides the tip for a better design of cylinder head.

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A Study on 6 Edges Reamer for the Improvement of Accuracy of Automotive Cylinder Head Guide Pin (자동차 실린더헤드 가이드 핀의 정밀도 향상을 위한 6날 리머에 관한 연구)

  • Kim Hae-Ji;Kim Nam-Kyung
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.13 no.6
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    • pp.81-86
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    • 2004
  • Generally, automotive cylinder head is manufactured by FCD45 material that is hard to cutting materials, and it needs the accurate machining tool fir higher output of engine. This paper is concerned with a study on TiN coated 6 edges reamer for improving machining accuracy of cylinder head guide pin. The reamer shape is changed from 4 edges to 6 edges for the improvement of machining accuracy. Also, TiN coating is applied to the improvement of surface roughness of cylinder head guide pin and tool life of 6 edges reamer. It is noted that 6 edges reamer are effective in controlling the dimensional accuracy and surface roughness as well as increasing tool life.

Effect of the Anti-Freeze Coolant on the Corrosion Resistance of Aluminum Cylinder Heads (알루미늄 실린더헤드의 내식성에 미치는 부동액의 영향)

  • 김영찬;배도인
    • Transactions of the Korean Society of Automotive Engineers
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    • v.7 no.5
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    • pp.89-95
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    • 1999
  • In this study, the corrosion resistance of the aluminum casting commercial materials used in the automotive engine parts with respect to the anti-freeze coolant environment has been tested by the potentio dynamic method. especially, the effect of borax additive in engine coolant on the corrosion resistance of the aluminum casting materials has been evaluated. It was found that the borax in commercial engine coolant, used to prevent the corrosion in cast iron engine, causes a pit corrosion of aluminum casting materials at high temperature. During the engine endurance test with the coolant containing borax, the aluminum cylinder head was failed by the pitting corrosion near the exhaust port. Conclusively, it was suggested that the use of borax in the anti-freeze coolant be restricted for the automotive with aluminum cylinder head.

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Study for Failure Examples Involved to Spark Plug Assembling Part Damage, Timing Maladjustment and Alien Substance Insertion in Intake Valve Part on LPG Vehicle Engine (자동차용 LPG 엔진의 점화플러그 장착 부 손상, 점화시기 조정불량, 흡입밸브 부 이물질유입 고장사례 연구)

  • Lee, IL Kwon;Kook, Chang Ho;Ham, Sung Hoon;Kim, Sung Mo;Hwang, Han Sub;Jung, Dong Hwa;Moon, Hak Hoon;Lee, Jeong Ho
    • Journal of the Korean Institute of Gas
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    • v.25 no.2
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    • pp.22-27
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    • 2021
  • This paper is a purpose to study the failure examples for LPG vehicle. The first example, the researcher certified the incongruity phenomenon decreased engine power by ignition fire leakage because of spark plug threaded part damage assembling in cylinder head. The second example, the timing mark that accurately adjusting the camshaft and crankshaft position were twisted about 0.5 block each other. Finally, the researcher seeked the disharmony phenomenon as it couldn't set ignition timing. The third example, the researcher knew the failure phenomenon by interrupted the closing period for intake valve moving with air flow in the number 3 port of cylinder head as the foreign substance in cylinder head didn't remove. Therefore, the manager of a car has to thorough going inspect and the manufacture of a car must remove the cause of failure with quality assurance.

Finite Element Analysis of Cylinder Head/Block Compound (엔진 실린더 헤드/블록의 유한 요소 해석)

  • Kim, Beom-Keun;Chang, Hoon
    • Transactions of the Korean Society of Automotive Engineers
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    • v.11 no.3
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    • pp.28-38
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    • 2003
  • Finite element analysis of cylinder heat/block compound under assembly, thermal and firing condition were performed. FE model including two cylinders with gasket, head bolts, liners and valve seats was used. FE modeling method and boundary conditions were introduced. Stress distribution and deformation of cylinder head and block under each loading condition were presented. Gasket pressure distribution and bore distortion level were predicted. Measured data of bore distortion was compared with the analysis results. The analysis result showed similar trends with the experimental data. High cycle fatigue analysis on the basis of this result has been performed in order to find the critical areas of the engine assembly.

Robust Design Study of Engine Cylinder Head (엔진 실린더헤드 강건 설계 방안)

  • Yang, Chull-Ho;Han, Moon-Sik
    • Transactions of the Korean Society of Automotive Engineers
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    • v.19 no.6
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    • pp.133-139
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    • 2011
  • Maintaining adequate sealing in engine cylinder head is a crucial factor in engine design. Failure of engine operations occurs mainly owing to the leaking by decreased sealing pressure. Reliability-robustness concept is applied to the engine cylinder head system. Deterministic way to obtain engineering solution in CAE industry may not consider the effects of noises and disturbances experienced during operation. However, analytical reliability-robustness concept may make possible to reduce the sensitivity of system with noise factors. Influences of design factors including noise factors would be predicted in analytical way. Optimized design may be obtained by shrinking variability and shifting to design target. Three-dimensional finite element analyses have been performed to apply analytical reliability-robustness concept.

Visualization of Coolant Flow in the Cylinder Read and Exhaust Valve Bridge for the Countermeasure of Thermal Loading in the DOHC Gasoline Engine (DOHC 가솔린기관의 열부하대책을 위한 실린더헤드 및 국소 배기밸브 브릿지부의 냉각수 유동해석)

  • 위신환;이종태
    • Transactions of the Korean Society of Automotive Engineers
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    • v.10 no.6
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    • pp.1-10
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    • 2002
  • As the preliminary stage for the countermeasure of thermal loading in miller cycle engine, coolant flows in the cylinder head of base engine including exhaust valve bridge were visualized and analyzed by using PIV technique. It was found that low coolant velocity regions were around exhaust valve bridge, around which stagnation of the coolant flow was observed due to the complex geometry configuration of water jacket. And velocity variation between each cylinder was remarkable. For the countermeasure of these, it is necessary to enhance coolant flow around exhaust valve bridge and to improve the deviation of coolant flow between each cylinder.

Numerical Optimization of the Coolant Flow Rates through Cylinder Head Gasket Holes by applying CFD Techniques (CFD 기법을 이용한 실린더헤드 가스켓홀 통과 유량의 최적화)

  • 백경욱;이상호;조남효
    • Transactions of the Korean Society of Automotive Engineers
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    • v.8 no.5
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    • pp.121-128
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    • 2000
  • Simple design methods were developed to control the coolant flow rates through cylinder head gasket holes. Applying the concept of flow through an obstruction the ratio of intake to exhaust side flow rates could be easily controlled while maintaining the flow rates per cylinder of the original model. Flow distribution in the coolant passage of the original model was calculated by CFD and the flow rates at the gasket holes were modified based on the calculation results. The calculated flow rated of the modified gasket holes were reasonably close to target values. For more accurate control of the flow rate distribution, a design method with iterative CFD calculations was also suggested. The final size of gasket holes for the target flow rates were obtained just after a few optimization iterations. These methods can be very useful for the optimization of heat transfer characteristics in engine cylinder head and block.

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