PROBLEM TO BE SOLVED: To improve discharging performance of condensed water with a simple structure.SOLUTION: When a vehicle is tilted frontward, condensed water LW staying in a horizontal part 90 of an exhaust pipe 20 is moved to a space 74C of a concave part 70 and stays there and a channel cross-section area decreases. Therefore, flux of exhaust gas passing through the upper side of the condensed water LW rises, a negative pressure is generated in the concave part 70 and water level of the condensed water LW is raised. Accordingly, a water film which closes a channel in the concave part 70 is formed and an exhaust pressure rises instantaneously. By the exhaust gas of which the exhaust pressure rises, the condensed water LW in the exhaust pipe 20 containing the condensed water LW in the space 74C together with the water film is discharged at a stroke. When the vehicle is tilted rearward, the condensed water LW staying in the horizontal part 90 stays in a space 84C of a concave part 80 and the condensed water LW in the exhaust pipe 20 is similarly discharged. According to devises on shape of the exhaust pipe 20 of the concave part 70 and the concave 80, discharging performance of the condensed water LW is improved and, therefore, the discharging performance of the condensed water LW is improved with a simple structure.SELECTED DRAWING: Figure 3

    【課題】簡易な構造で、凝縮水の排出性を向上させる。【解決手段】車両が前傾になると、排気管20の水平部90に溜まった凝縮水LWは、凹部70の空間74Cに移動して溜まり、流路断面積が減少する。このため、凝縮水LWの上側を通過する排気ガスの流速が上がり、凹部70内に負圧が発生して、凝縮水LWの水面が持ち上がる。これにより、凹部70での流路を閉じる水膜が形成され、瞬間的に排気圧力が上昇する。排気圧力が上昇した排気ガスによって、水膜と共に、空間74C内の凝縮水LWを含む排気管20内の凝縮水LWが、一気に排水される。車両が後傾となった場合は、水平部90に溜まった凝縮水LWが、凹部80の空間84Cに溜まり、前述と同様に、排気管20内の凝縮水LWが排水される。凹部70及び凹部80の形成という排気管20の形状の工夫により、凝縮水LWの排水性を向上させるので、簡易な構造で、凝縮水LWの排出性が向上する。【選択図】図3


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    Title :

    EXHAUST PIPE STRUCTURE


    Additional title:

    排気管構造


    Contributors:
    SAWAI OSAMU (author)

    Publication date :

    2018-04-26


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

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



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