To provide: a ship propulsion machine capable of reducing a pressure loss in engine exhaust; a ship including the ship propulsion machine; a ship engine included in the ship propulsion machine; and a ship engine exhaust structure.SOLUTION: A ship propulsion machine includes an engine 20 and a propulsion unit driven with the engine 20. The engine 20 has: a plurality of cylinders which is serially arranged; a plurality of exhaust ports 54 which are respectively connected to combustion chambers of the plurality of cylinders, is curved in a predetermined downstream direction, and allows exhaust to flow out of the combustion chambers; and a collecting exhaust pipe 71. The collecting exhaust pipe 71 is integrated with the plurality of exhaust ports 54 and extended in the downstream direction so as to allow the exhaust in the exhaust ports 54 to flow in the downstream direction. A concave section 75 is installed on an inner face of a connection section between the exhaust ports 54 and the collecting exhaust pipe 71.SELECTED DRAWING: Figure 6

    【課題】エンジンの排気の圧力損失の低減を図ることができる船舶推進機、この船舶推進機を含む船舶、この船舶推進機に含まれる船舶用エンジン、及び、船舶用エンジンの排気構造を提供する。【解決手段】船舶推進機は、エンジン20と、エンジン20によって駆動される推進ユニットと、を含む。エンジン20は、直列に配置された複数のシリンダと、複数のシリンダの燃焼室にそれぞれ接続されて所定の下流方向へ湾曲して燃焼室から排気を流出させる複数の排気ポート54と、集合排気管71と、を含む。集合排気管71は、複数の排気ポート54と一体形成されて下流方向へ延びて排気ポート54内の排気を下流方向へ流す。排気ポート54と集合排気管71との接続部における内面には、凹部75が設けられている。【選択図】図6


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    Title :

    SHIP PROPULSION MACHINE, SHIP, SHIP ENGINE AND SHIP ENGINE EXHAUST STRUCTURE


    Additional title:

    船舶推進機、船舶、船舶用エンジン及び船舶用エンジンの排気構造


    Contributors:

    Publication date :

    2023-05-25


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    F01N GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL , Schalldämpfer oder Auspuffvorrichtungen für Gase von Kraft- und Arbeitsmaschinen oder von Kraftmaschinen allgemein / B63H Schiffsantrieb oder Steuerung der Schiffe , MARINE PROPULSION OR STEERING / F02F CYLINDERS, PISTONS, OR CASINGS FOR COMBUSTION ENGINES , Zylinder, Kolben oder Gehäuse für Brennkraftmaschinen



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