To be able to improve the heat insulation property of the exhaust pipe while arranging the exhaust pipe compactly in the arrangement direction of the exhaust pipe.SOLUTION: In an exhaust pipe structure of serial four-cylinder internal combustion engine that comprises: a serial four-cylinder internal combustion engine; four exhaust pipes 40a, 40b, 40c, and 40d connected to the exhaust port of each cylinder of the internal combustion engine; and a collective exhaust pipe 41 connected to a collecting part (45) where the downstream ends of all the exhaust pipes (40a, 40b, 40c, and 40d) collect, each exhaust pipe 40a, 40b, 40c, and 40d is configured by a double pipe including an outer pipe 50 and an inner pipe 51 provided inside the outer pipe 50, in the collecting part 45, while the four exhaust pipes 40a, 40b, 40c, and 40d being arranged in parallel in a straight line, the adjacent exhaust pipes 40a, 40b, 40c, and 40d are directly welded to the outer pipes 50 at the front and downstream ends.SELECTED DRAWING: Figure 7

    【課題】排気管を排気管の配列方向にコンパクトに配置するとともに、排気管の保温性を向上できるようにする。【解決手段】直列4気筒の内燃機関と、前記内燃機関の各気筒の排気ポートに接続される4本の排気管40a,40b,40c,40dと、全ての排気管(40a,40b,40c,40d)の下流端が集合する集合部(45)に接続される集合排気管41とを有する直列4気筒内燃機関の排気管構造において、各排気管40a,40b,40c,40dは、外管50と外管50の内側に設けられる内管51とを備える二重管で構成され、集合部45では、4本の排気管40a,40b,40c,40dが直線状の並びで並列に配列されるとともに、隣り合う排気管40a,40b,40c,40dは、前下流端の外管50同士が直接溶接される。【選択図】図7


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    Title :

    EXHAUST PIPE STRUCTURE OF SERIAL FOUR-CYLINDER INTERNAL COMBUSTION ENGINE


    Additional title:

    直列4気筒内燃機関の排気管構造


    Contributors:

    Publication date :

    2020-03-19


    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 / B60K Anordnung oder Einbau von Antriebseinheiten oder von Kraft- bzw. Drehmomentübertragungen in Fahrzeugen , ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES




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