NOISE REDUCTION DEVICE AND NOISE REDUCTION METHOD FOR INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To provide a noise reduction device that efficiently reduces noise generated from an internal combustion engine.SOLUTION: The noise reduction device includes: at least one combustion chamber cooling water passage 2a formed around a combustion chamber 4 of an internal combustion engine 100; and at least one reduced sound discharge means 6 for imparting sound to the cooling water inside the combustion chamber cooling water passage 2a. The sound discharged from the reduced sound discharge means 6 is reduced sound for reducing noise propagated to the outside of the internal combustion engine 100 from the combustion chamber 4.SELECTED DRAWING: Figure 1