To provide a catalyst arrangement structure in which an exhaust gas treatment catalyst is disposed in opposition to an exhaust port while keeping a simple structure of an exhaust pipe connected to the exhaust port, and which can contribute to early activation of the exhaust gas treatment catalyst, in a catalyst arrangement structure of a saddle riding-type vehicle including a horizontal cylinder internal combustion engine.SOLUTION: In a catalyst arrangement structure of a saddle riding-type vehicle 1, 101 in which a horizontal cylinder internal combustion engine 4, 104 is mounted, and an exhaust port 48, 148 of the horizontal cylinder internal combustion engine is directed to a vehicle lower part, an exhaust pipe 5, 105 connected to the exhaust port and extended to a lower part has an upstream end straight pipe portion 51, 151, a curved pipe portion 52, 152 connected with the upstream end straight pipe portion, and a downstream straight pipe portion 53, 153 connected with a downstream side of the curved pipe portion, and a first exhaust gas treatment catalyst 71, 171 is disposed in the upstream straight pipe portion.SELECTED DRAWING: Figure 2
【課題】水平シリンダ内燃機関を備えた鞍乗型車両の触媒配置構造において、排気口に接続する排気管を簡潔な構造のまま排気口に臨んで排気ガス処理触媒が設けられ、排気ガス処理触媒の早期活性化に寄与できる触媒配置構造。【解決手段】水平シリンダ内燃機関4,104が搭載され、水平シリンダ内燃機関の排気口48,148が車両下方を指向して配置された鞍乗型車両1,101の触媒配置構造において、排気口に接続し下方へ延出する排気管5,105は、排ガス流れ方向上流側から上流端直管部51,151と、上流端直管部に接続する湾曲管部52,152と、湾曲管部の下流に接続する下流直管部53,153を有し、上流直管部内に第1の排気ガス処理触媒71,171が配置された。【選択図】図2
CATALYST ARRANGEMENT STRUCTURE OF SADDLE RIDING-TYPE VEHICLE
鞍乗型車両の触媒配置構造
2020-02-20
Patent
Electronic Resource
Japanese
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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