PROBLEM TO BE SOLVED: To provide an engine that can supply an appropriate amount of secondary air to an exhaust passage at appropriate timing.SOLUTION: An engine includes a combustion chamber, an exhaust passage, a secondary air passage, an air control device, and a throttle. The exhaust passage is connected to the combustion chamber. The secondary air passage is connected to the exhaust passage, and secondary air to be supplied to the exhaust passage passes therethrough. The air control device includes a valve element for opening/closing the secondary air passage, and is provided in the secondary air passage. The throttle is provided in the secondary air passage. The valve element is a one-way valve for opening/closing the secondary air passage depending on exhaust pressure in the exhaust passage. In the secondary air passage, a flow passage capacity downstream from the throttle is larger than a flow passage capacity from the valve element to the exhaust passage.SELECTED DRAWING: Figure 6
【課題】適切な量の二次空気を適切なタイミングで排気通路に供給することができるエンジンを提供する。【解決手段】エンジンは、燃焼室と、排気通路と、二次空気通路と、空気制御装置と、絞りと、を含む。排気通路は、燃焼室に接続される。二次空気通路は、排気通路に接続され、排気通路に供給される二次空気が通る。空気制御装置は、二次空気通路を開閉する弁体を含み、二次空気通路に設けられる。絞りは、二次空気通路に設けられる。弁体は、排気通路内の排気の圧力に応じて二次空気通路を開閉する一方向弁である。二次空気通路において、絞りより下流の流路容積は、弁体から排気通路までの流路容積よりも大きい。【選択図】図6
ENGINE AND SADDLE RIDING TYPE VEHICLE
エンジン及び鞍乗型車両
2018-08-02
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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