最近の排気弁の諸問題 : ―燃料の多様化と高出力・低燃費化に対して―

概要

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Following to the recent trends of low fuel consumption, high output and fuel diversification such as heavy fuel use, diesel engine components are exposed under increased load and temperature. The components in the combustion chamber which are subjected to both thermal and mechanical load simultaneously are required higher reliability. In particular, exhaust valve which is one of the highest temperature components is subjected to more severe condition than others. The authors have studied to improve reliability of the exhaust valve used under above mentioned condition. In order to reduce mechanical stress, especially on valve head, FEM calculations as well as stress measurements have been conducted and an optimum shape of valve head was proposed. As for the corrosion resistance of exhaust valve used with heavy fuel, experiments have been made both in laboratory and on test engine. A Nimonic valve is one of the best solution, today, for both stresa resistance under high temperature and corrosion resistance.
社団法人日本マリンエンジニアリング学会の論文