• 제목/요약/키워드: 실린더 보어

검색결과 12건 처리시간 0.025초

유압 액셜 피스톤 펌프의 실린더 보어 내부 비정상 압력 특성에 관한 실험적 연구 (An Experimental Study on Dynamic Pressure Characteristics in the Cylinder Bore of Oil Hydraulic Axial Piston Pump)

  • 김종기;정석훈;정재연
    • 한국정밀공학회지
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    • 제18권1호
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    • pp.74-81
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    • 2001
  • Dynamic pressure is one of the major sources on noise emission in oil hydraulic piston pump. This paper reports an experimental study of dynamic pressure characteristics in the cylinder bore of oil hydraulic piston pump. We experimently measured dynamic pressure at BDC with delivery pressure, rotational speed and oil temperature. Because the V-grooves at the ends of the kidney ports with three types valve plates. We hope this paper help to design of the valve plate in oil hydraulic piston pump.

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

  • 김범근;장훈
    • 한국자동차공학회논문집
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    • 제11권3호
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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.

강제 진동을 고려한 실린더 보어의 동적 변형 해석 (Dynamic Deformation Analysis of Cylinder Bore considering Forced Vibration)

  • 윤성호;조덕형
    • 한국자동차공학회논문집
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    • 제10권5호
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    • pp.174-181
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    • 2002
  • Dynamic deformation of the cylinder bore during actual engine operation has an important effect on the combustion gas sealing, oil consumption, friction and so on. The dynamic analysis using the finite element method is performed to investigate the dynamic deformation of the cylinder bore subjected to forced vibration under excitation of the combustion gas pressure. However, this analysis requires large computer memory and tremendous solving time. The pseudo-static analysis can be an alternative to the dynamic analysis at the expense of accuracy. Dynamic analysis and static analysis results are presented for both closed-deck block and open-deck block that are respectively combined with the cylinder block, cylinder head, transmission, and oil pan.

신뢰성 설계를 위한 엔진 실린더 블록과 메인 보어의 유한요소해석 (Finite Element Analysis of Engine Cylinder Block and Main Bore for Reliable Design)

  • 양철호;한문식
    • 한국자동차공학회논문집
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    • 제13권4호
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    • pp.39-48
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    • 2005
  • Finite element analyses have been performed for the purpose of obtaining the robust and reliable design of engine cylinder block. Fatigue under high cycle operating loads is a primary concern and is evaluated by a probabilistic method. The robust and reliable design by a probabilistic method can provide satisfactory design conditions for the performance of the system under the influence of noise factors. Therefore, the design by this method will be desensitized to the uncontrollable noise factors. The simple methodology evaluates the distortion of main bore is proposed for the purpose of maintaining a well-controlled clearance between the crankshaft and main bores. The proposed methodology has proven a capability of predicting the distortion of the main bore under assembly, thermal, and firing loads. The calculated results are correlated well with the experimental ones.

자동차 실린더 블록 주조에서 워터 자켓용 샌드 코어 특성에 영향을 미치는 인자 (Factors Influencing Characteristics of Sand Core for Water Jacket in Automotive Cylinder Blocks Casting)

  • 김기준
    • 한국융합학회논문지
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    • 제12권2호
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    • pp.185-191
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    • 2021
  • 본 자동차 실린더 블록 주조시 실린더 보어 내에서 발생하는 열로부터 구조적 변형을 방지하는데 필요한 워터 자켓 코어용 주물사의 특성을 분석하였다. 샌드 코어의 특성평가를 위하여 인장강도 시험기, 입도 지수(AFS-GFN), 광학현미경을 사용하였다. 주물사의 SiO2 함량이 높으면 고온팽창에 의한 치수 불량, 베이닝 불량이 발생하며, 너무 낮으면 코어 파손, 기포, 화학적 소착 등이 발생하였다. 입도 지수와 입형이 코어강도와 레진 소비량에 영향을 미치고, 이로 인한 불량 유형 변화가 발생하였다. 건조사가 염분이 높을수록 코어 강도는 감소하며, 알칼리성일수록 코어 강도가 감소하였다. 레진 함량 1.6~1.8%에서 1시간 경화 이후에 코어 강도 증가는 대략 최대를 보였다.

자동차용 가솔린 기관의 실린더 블록에 대한 열적 거동 해석 (Thermal Behavior Analysis on the Cylinder Block of an Automotive Gasoline Engine)

  • 손병진;김창헌
    • 한국자동차공학회논문집
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    • 제6권5호
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    • pp.211-221
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    • 1998
  • Thermal behavior on the cylinder block of a 4-cylinder, 4-stroke 2.0L SOHC gasoline engine was numerically and experimentally analyzed. The numerical calculation was performed using the finite element method. The cylinder block was modelled as a three dimensional finite element by considering its geometry. The physical domain was devided into hexahedron elements. 16 thermocouples were installed at points of 2mm inside from cylinder wall near top ring of piston in cylinder block, which points have suffered major thermal loads and suggested as proper measurement points for engine design by industrial engineers. Under full load and 9$0^{\circ}C$ coolant temperature condition, temperature behavior of cylinder block according to engine speed were analyzed. The results showed that temperature rose gradually to conform to a function of 2nd~4th order of engine speed at intake side, exhaust and siamese side, respectively. As engine load was changed from 100 to 50% by 25% step, temperature curve also conformed to 2nd~7th order function of engine speed. Temperature differences by load condition were similar among 100, 75% and 50%. Under full load and coolant temperature of 11$0^{\circ}C$, temperature behavior were also analyzed and the result also showed conformance to 2n d~7th order function of engine speed. Temperature curve was transferred in parallel upwards corresponding coolant temperature rise.

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내경 플라즈마 용사법에 의한 과공정 Al-Si 합금의 실린더 블록 보어 개발을 위한 기초연구 (Basic Research for Development of Hypereutectic Al-Si Alloyed Cylinder Block Bore by Plasma Spraying System for Internal Diameters)

  • 김병희;이형근;김혜성
    • 한국재료학회지
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    • 제11권11호
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    • pp.965-971
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    • 2001
  • The objective of this study is to investigate the characteristics - microstructure, hardness, adhesive strength and friction coefficient - of the coatings with aging - treatment after optimizing internal- plasma spraying parameters for Al-30wt%Si powder as a basic research to manufacture the cylinder block bore for Al engine composed of Al-30wt%Si alloy on Al alloy, The optimum internal-plasma spraying parameters of Al-30wt%Si alloy are summarized as follows: voltage: 37.5V, current: 160A, working distance: 25mm, gun traverse speed: 4.5mm/s, rotating speed: 518m/min. The primary Si particles grew aggressively with increasing heat-treating temperature. The hardness of the as-sprayed coating was about Hv=275 but this value was abruptly decreased with increasing heat-treating temperature. And average friction coefficient of the coating was below 0.08 after heat treatment for 48h at $175^{\circ}C$.

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