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    • 9. 发明专利
    • EXHAUST MUFFLER STRUCTURE OF MARINE VESSEL PROPELLER
    • JPS6424109A
    • 1989-01-26
    • JP17916587
    • 1987-07-20
    • SANSHIN KOGYO KK
    • OKAZAKI MASAKIFUJIMOTO HIROAKI
    • B63H21/32F01N1/02F01N1/16F01N1/22F01N3/04F01N13/12F02B61/04
    • PURPOSE:To enhance an exhaust muffling effect by providing an elastic guide wall for changing the flow direction of exhaust in a subsidiary exhaust passage in a system comprising a main exhaust passage for guiding exhaust of an engine to a main exhaust port opened below the surface of the water. CONSTITUTION:A cylinder 22 is disposed at the central portion of a casing 14 loaded with an engine 16 on the upper portion thereof, and an exhaust pipe 26 connected to an exhaust passage 24 of the engine 16 is opened to a main expansion chamber 23 formed in the cylinder. The main expansion chamber 23 is communicated with below the surface of the water through an exhaust passage 27 disposed under the casing 14 and a main exhaust port 29 formed on a boss portion 28 of a propeller 19, and a main exhaust passage is formed by the above respective elements 23, 24, 27. Further, the main expansion chamber 23 is communicated with below the surface of the water or in the air through a subsidiary exhaust passage 30 formed on the casing 14 and the cylinder 22 and a subsidiary exhaust port 31. In this case, an elastic wall 38 is provided opposite to a pore-like passage 32 of a subsidiary expansion chamber 33 forming the subsidiary exhaust passage 30 to damp wave energy of exhaust.