• Title/Summary/Keyword: Main bore distortion

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

  • Yang Chulho;Han Moonsik
    • Transactions of the Korean Society of Automotive Engineers
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    • v.13 no.4
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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.

A Finite Element Analysis on Cylinder Liner Deformation of a Diesel Engine (디젤기관 실린더 라이너 변형에 대한 유한요소 해석)

  • Sangho Ahn
    • Journal of Auto-vehicle Safety Association
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    • v.6 no.1
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    • pp.33-40
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    • 2014
  • In this study the cylinder liner deformation which is one of the most influencing factors in a diesel engine oil consumption was performed by the finite element analysis on the basic designed structure consisting of the cylinder block, head and liners under the conditions of assembly, thermal and gas loads. Compared with a large number of other cylinder blocks showing remarkable harmonic orders of the liner distortion, results are excellent. Namely. the higher harmonic order amplitudes of the radial liner deformation amount to 1 ~ 2㎛ maximally. The main reason lies in the relatively large wall thickness of the liner which amounts to 8.2% of the bore diameter. Besides, a very stiff and symmetrical cylinder block design in combination with a bolt force introduction approximately 1.5mm below the block top deck have a further share on these results. Therefore excellent low oil consumption can be expected.