Recent Trends of Cylinder Block in Internal Combustion Engine Contributing towards Carbon Neutrality

DOI
  • HIBI Taiga
    1st Research Dept., ISUZU ADVANCED ENGINEERING CENTER, LTD.
  • MITA Takuro
    1st Research Dept., ISUZU ADVANCED ENGINEERING CENTER, LTD.
  • YAMASHITA Kenichi
    1st Research Dept., ISUZU ADVANCED ENGINEERING CENTER, LTD.

Bibliographic Information

Other Title
  • カーボンニュートラルに貢献する内燃機関用シリンダブロックの技術動向
  • ―Improvement in Diesel Engine Performance by Improving Cylinder Bore Profile under Firing Conditions―
  • ―実働時のシリンダボア形状改善によるディーゼル機関の性能向上―

Abstract

<p>A cylinder block involves bore deformation due to assembling stress of cylinder head and thermal stress. Friction analysis method of a piston skirt was established and the bore deformation effect on engine performance was clarified. Bore distortion analysis revealed the bore profile of constriction at bottom side and expansion toward upper side in the case of normal bore. This distortion is found to be the cause of exacerbation of the trade-off between skirt friction and piston slap. As a result of CAE prediction, ideal cylindrical bore under the highest thermal load condition significantly improved skirt friction, blow-by gas flow and LOC. Simulation results indicated that the change of design parameters for piston and rings lead to additional improvement of engine performance.</p>

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