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分析了内燃机正时齿轮噪声形成原因，国内外文献推荐的几种正时齿轮降噪措施及其效果，并在国产柴油机上进行了验证，为降低柴油机机械噪声作了有益的探索。
The reason of formation of timing gear noise of internal combustion engine is analyzed. Several kinds of timing gear noise reduction measures recommended by domestic and foreign literatures and their effects are also analyzed. The results are validated on domestic diesel engine, which makes a useful exploration to reduce the mechanical noise of diesel engine.