To miniaturize a muffler by securing a muffler chamber below an engine.SOLUTION: An exhaust system (50) guides exhaust gas from an exhaust pipe (51L) at the front of an engine (30) to a muffler at the rear of the engine. The exhaust system includes a primary catalyst case (53) in which a primary catalyst (54) for purifying the exhaust gas downstream of the exhaust pipe is stored, a secondary catalyst case (61) in which a secondary catalyst (62) for purifying the exhaust gas downstream of the primary catalyst is stored, and a chamber (71) in which a muffler chamber for reducing exhaust sound downstream of the second catalyst is formed. The primary catalyst case is arranged in a front space of the engine, the secondary catalyst case is arranged in the front side of a lower space of the engine, and the chamber can occupy the rear side of the lower space of the engine at least.SELECTED DRAWING: Figure 3

    【課題】エンジンの下方に消音室を確保してマフラの小型化を図る。【解決手段】排気装置(50)は、エンジン(30)の前方の排気管(51L)から当該エンジンの後方のマフラに排気ガスを導いる。排気装置には、排気管の下流で排気ガスを浄化する一次触媒(54)が収容された一次触媒ケース(53)と、一次触媒の下流で排気ガスを浄化する二次触媒(62)が収容された二次触媒ケース(61)と、二次触媒の下流で排気音を低減する消音室が形成されたチャンバ(71)と、が設けられている。一次触媒ケースがエンジンの前方空間に配置され、二次触媒ケースがエンジンの下方空間の前側に配置され、チャンバが少なくともエンジンの下方空間の後側を占有可能に配置されている。【選択図】図3


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    Title :

    EXHAUST SYSTEM


    Additional title:

    排気装置


    Contributors:

    Publication date :

    2022-07-21


    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 / B62M RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES , Antrieb von Radfahrzeugen oder Schlitten durch den Fahrer



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