JP4687448B2 - Silencer - Google Patents

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JP4687448B2
JP4687448B2 JP2005372358A JP2005372358A JP4687448B2 JP 4687448 B2 JP4687448 B2 JP 4687448B2 JP 2005372358 A JP2005372358 A JP 2005372358A JP 2005372358 A JP2005372358 A JP 2005372358A JP 4687448 B2 JP4687448 B2 JP 4687448B2
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vehicle
silencer
outer cylinder
air
automobile
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JP2007170343A (en
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守 八島
隆人 石畑
昌良 中田
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Toyota Motor Corp
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Description

本発明は、車両に搭載される消音器に関するものである。   The present invention relates to a silencer mounted on a vehicle.

自動車等の車両においては、内燃機関の排気系に、特許文献１に示されるような排気浄化装置が設けられ、同装置にて内燃機関の排気浄化が図られる。更に、同装置の排気下流側には、非特許文献１に示されるような消音器が設けられ、同消音器にて内燃機関の排気音が消音される。こうした消音器は、断面略円形状に形成された外筒を備えており、車両の下面に例えば車両の幅方向に延びた状態で取り付けられる。   In a vehicle such as an automobile, an exhaust purification device as disclosed in Patent Document 1 is provided in an exhaust system of an internal combustion engine, and the exhaust purification of the internal combustion engine is achieved by this device. Furthermore, a silencer as shown in Non-Patent Document 1 is provided on the exhaust downstream side of the apparatus, and the exhaust sound of the internal combustion engine is silenced by the silencer. Such a silencer includes an outer cylinder having a substantially circular cross section, and is attached to the lower surface of the vehicle, for example, in a state of extending in the width direction of the vehicle.

ところで、車両においては、その下面が平面に近いほど、走行時における車両下側の空気の流れが上記下面に沿ったものとなってスムーズになり、走行中の空気抵抗を受けにくくなるという傾向がある。また、走行時における車両下側の空気の流れがスムーズになると、車両下側の空気が車両後方へと効率よく抜けるために車両下側の気圧が低下し、車両下側と車両上側との気圧差が大となる。そして、この気圧差に基づく力が車両を下方に押さえるように働くことになることから、上記力を大きくして車両を安定して走行させることが可能になる。   By the way, in a vehicle, as the lower surface thereof is closer to a plane, the flow of air below the vehicle during traveling becomes smoother along the lower surface, and the air resistance during traveling tends to be less likely to be received. is there. In addition, when the air flow on the lower side of the vehicle becomes smooth during running, the air on the lower side of the vehicle is efficiently exhausted to the rear of the vehicle, so that the air pressure on the lower side of the vehicle decreases and The difference becomes large. And since the force based on this pressure difference works so as to hold down the vehicle, it is possible to increase the force and make the vehicle run stably.

このため、車両の下面に消音器を取り付ける際には、図８に示されるように、車両５１の下面５２に凹部５３を設け、その凹部５３内に消音器５４を配置することで、上記下面５２から下方への消音器５４の突出量を可能なかぎり小さく抑え、その消音器５４によって走行時における車両下側の空気の流れが乱れるのを抑えることが考えられる。
特開２００３−９０２１４公報 発明協会公開技報 公技番号２０００−３２９３ Therefore, when the silencer is attached to the lower surface of the vehicle, as shown in FIG. 8, a concave portion 53 is provided on the lower surface 52 of the vehicle 51, and the silencer 54 is disposed in the concave portion 53. It is conceivable that the amount of protrusion of the silencer 54 downward from 52 is suppressed as much as possible, and the silencer 54 suppresses the disturbance of the air flow on the lower side of the vehicle during traveling.
JP 2003-90214 A Japan Society for Invention and Innovation Technical Bulletin No. 2000-3293

上記のように車両５１の下面に形成された凹部５３内に消音器５４を取り付けることで、下面５２から下方への消音器５４の突出量を可能な限り小さく抑えることはできるものの、消音器５４全体を凹部５３内に収めることはできず、下面５２から下方に消音器５４の下部が突出することは避けられない。   Although the silencer 54 is attached in the recess 53 formed on the lower surface of the vehicle 51 as described above, the amount of protrusion of the silencer 54 downward from the lower surface 52 can be suppressed as much as possible, but the silencer 54 The entirety cannot be stored in the recess 53, and it is inevitable that the lower portion of the silencer 54 protrudes downward from the lower surface 52.

ここで、消音器５４全体を凹部５３内に収めることができない理由としては、以下の二つの点があげられる。すなわち、下面５２に凹部５３を形成するということは、それによって下面５２が車両の室内側に膨らむということであり、車両の室内の広さを確保する必要がある関係から、上記凹部５３を大きくするのには限界がある。また、消音器５４の消音性能を十分なものにするには、消音器５４の容量をある程度確保する必要があることから、消音器５４を小さくするのにも限界がある。こうした二つの理由により、消音器５４全体を凹部５３内に収めることができず、凹部５３内に消音器５４を取り付けるようにしたとしても、下面５２から下方に消音器５４の下部が突出する。   Here, there are the following two reasons why the entire silencer 54 cannot be accommodated in the recess 53. That is, the formation of the concave portion 53 in the lower surface 52 means that the lower surface 52 swells toward the vehicle interior side, and the above-described concave portion 53 is made larger because it is necessary to ensure the size of the vehicle interior. There are limits to doing it. In addition, in order to make the silencer 54 have a sufficient silencing performance, it is necessary to secure a certain amount of capacity of the silencer 54, and thus there is a limit to reducing the silencer 54. For these two reasons, the entire silencer 54 cannot be accommodated in the recess 53, and even if the silencer 54 is mounted in the recess 53, the lower part of the silencer 54 protrudes downward from the lower surface 52.

車両５１の下面５２から下方に消音器５４の下部が突出する場合、走行時における車両下側の空気の流れは図中の矢印で示されるようなものになる。すなわち、走行中における車両下側の空気は、消音器５４の前側に当たった後、下方に向けて円弧状に膨らむ消音器５４の外面に沿って後側に流れる。そして、消音器５４に沿って後方に流れる上記空気は、消音器５４の下端ＬＥを通過すると、同消音器５４の外面が上方に向けて曲がっていることから、図９に矢印で示されるように後方に流れて上記外面から剥離する。このように外面から剥離した空気は、剥離直前まで湾曲した同外面に沿って流れており、剥離後に車両５１の下面５２に沿って流れるよう方向づけられてはいない。また、車両の走行中においては、消音器５４の後方の気圧が低くなっている。   When the lower part of the silencer 54 protrudes downward from the lower surface 52 of the vehicle 51, the flow of air below the vehicle during traveling is as shown by the arrows in the figure. That is, the air below the vehicle during traveling hits the front side of the silencer 54 and then flows to the rear side along the outer surface of the silencer 54 that bulges downward in an arc shape. Then, when the air flowing backward along the silencer 54 passes through the lower end LE of the silencer 54, the outer surface of the silencer 54 is bent upward, so that it is indicated by an arrow in FIG. To the rear and peel from the outer surface. The air thus peeled from the outer surface flows along the curved outer surface until just before peeling, and is not directed to flow along the lower surface 52 of the vehicle 51 after peeling. Further, the atmospheric pressure behind the silencer 54 is low while the vehicle is traveling.

従って、上記外面から剥離した後の空気は、上述した外面からの剥離直前の空気流の整流状態、及び、車両走行中における消音器５４後方の気圧低下に起因して、消音器５４の後方にて上方に巻き込まれることとなる。このように外面から剥離した後の空気の流れが乱れると、走行時における車両下側の空気の流れが滞り、車両走行中の空気抵抗が大となる。更に、車両下側の気圧が高くなって車両上側と車両下側との気圧差が小となり、その気圧差に基づいて車両を下方に抑えるように力が働くとき、その力が小さくなって車両の安定走行に悪影響を及ぼすおそれがある。   Therefore, the air after peeling from the outer surface is behind the silencer 54 due to the rectified state of the air flow just before peeling from the outer surface and the pressure drop behind the silencer 54 while the vehicle is running. Will be caught upward. When the air flow after peeling from the outer surface is disturbed in this way, the air flow on the lower side of the vehicle during running is delayed, and the air resistance during running of the vehicle increases. Furthermore, when the air pressure on the vehicle lower side becomes higher and the air pressure difference between the vehicle upper side and the vehicle lower side becomes smaller, and the force acts to restrain the vehicle downward based on the air pressure difference, the force becomes smaller. May adversely affect the stable running of the car.

本発明はこのような実情に鑑みてなされたものであって、その目的は、走行中の車両下側における空気の流れをスムーズにすることのできる消音器を提供することにある。   This invention is made | formed in view of such a situation, The objective is to provide the silencer which can smooth the flow of the air on the vehicle lower side during driving | running | working.

以下、上記目的を達成するための手段及びその作用効果について記載する。
上記目的を達成するため、請求項１記載の発明では、断面略円形状の外筒を備えており、車両の下面に同車両の幅方向に延びるように取り付けられる消音器において、前記外筒の下側には車両走行時における車両下側の空気の流れが車両の下面における前記外筒の車両後方側に位置する車体フロアに向かう流れとなるよう整流する整流板が設けられ、前記整流板は、車両の下面における前記外筒よりも車両後方側に位置する車体フロアに向けて延びるものであり、かつ鈍角に屈曲しており、前記外筒の下側にて車両の下面における前記外筒よりも車両後方に位置する車体フロアに向けて延びる指向部と、その指向部の車両前方側に位置して車両の前方に向かうほど同車両の下面に接近するよう傾斜する傾斜部とを備えていることを要旨とした。 In the following, means for achieving the above object and its effects are described.
In order to achieve the above object, according to the first aspect of the present invention, in the silencer that includes an outer cylinder having a substantially circular cross section and is attached to the lower surface of the vehicle so as to extend in the width direction of the vehicle, On the lower side is provided a rectifying plate that rectifies the air flow on the vehicle lower side during vehicle travel so as to flow toward the vehicle body floor located on the vehicle rear side of the outer cylinder on the lower surface of the vehicle , , Extending toward the vehicle body floor located on the vehicle rear side with respect to the outer cylinder on the lower surface of the vehicle, bent at an obtuse angle, and below the outer cylinder on the lower surface of the vehicle with respect to the outer cylinder Also includes a directing portion extending toward the vehicle body floor located at the rear of the vehicle, and an inclined portion that is located on the vehicle front side of the directing portion and is inclined so as to approach the lower surface of the vehicle toward the front of the vehicle. The gist

上記構成によれば、車両走行中に後方に向けて流れる車両下側の空気は、消音器の外筒の下側を通過する際、整流板によって車両の下面における外筒よりも車両後ろ側に位置する車体フロアに向けて流れるよう方向づけられる。その結果、車両の走行中に消音器の後方の気圧が低くなるとしても、整流板から離れて後方に流れる空気が消音器の後方にて上方に巻き込まれることは抑制される。そして、整流板から離れて後方に流れる空気は、車両の下面における消音器よりも車両後ろ側に位置する車体フロアに沿って流れることになる。従って、走行中の車両下側の空気の流れが乱れて滞るのを抑制することができ、その空気の流れをスムーズなものとすることができる。また、走行中における車両下側の空気の流れがスムーズであるため、車両走行中の空気抵抗が大となるのを抑制することができる。更に、車両下側の気圧を低くして車両上側と車両下側との気圧差を大きい値に保つことができ、その気圧差に基づいて車両を下方に抑えるように力が働くとき、その力が小さくなって車両の安定走行に悪影響を及ぼすのを抑制することもできる。
また、上記構成によれば、車両走行中に後方に向けて流れる車両下側の空気は、消音器の外筒の下側を通過する際、車両の下面における外筒よりも車両後ろ側に位置する車体フロアに向けて延びる整流板に沿って流れ、その後に整流板よりも後方に流れることとなる。このように整流板から離れた空気は、その直前まで車両の下面における消音器よりも車両後ろ側に位置する車体フロアに向けて延びる整流板に沿って流れており、これによって整流板から離れた後に上記下面に向けて流れるよう方向づけられる。 According to the above configuration, the air on the lower side of the vehicle that flows backward while the vehicle is traveling passes through the lower side of the outer cylinder of the silencer, and is placed on the rear side of the vehicle below the outer cylinder on the lower surface of the vehicle. Directed to flow toward the vehicle body floor located. As a result, even if the air pressure behind the silencer becomes low during the traveling of the vehicle, the air flowing away from the rectifying plate and flowing backward is suppressed from being caught upwards behind the silencer. And the air which flows backward away from the current plate flows along the vehicle body floor located on the vehicle rear side with respect to the silencer on the lower surface of the vehicle. Therefore, it is possible to suppress the turbulence and stagnation of the air flow on the lower side of the running vehicle, and to smooth the air flow. Further, since the air flow on the lower side of the vehicle during traveling is smooth, it is possible to suppress an increase in air resistance during vehicle traveling. Furthermore, the pressure on the lower side of the vehicle can be lowered to keep the pressure difference between the upper side of the vehicle and the lower side of the vehicle at a large value, and when the force works to keep the vehicle downward based on the pressure difference, It is possible to suppress the adverse effect on the stable running of the vehicle due to a decrease in the vehicle speed.
Further, according to the above configuration, the air on the lower side of the vehicle that flows backward while the vehicle is traveling is located on the vehicle rear side with respect to the outer tube on the lower surface of the vehicle when passing the lower side of the outer tube of the silencer. It flows along the current plate extending toward the vehicle body floor, and then flows backward from the current plate. Thus, the air separated from the current plate flows along the current plate extending toward the vehicle body floor located on the vehicle rear side of the silencer on the lower surface of the vehicle until just before that, and thus separated from the current plate. It is directed to flow toward the lower surface later.

また、上記構成によれば、車両走行中に後方に向けて流れる車両下側の空気は、整流板の傾斜部に当たって同傾斜部に沿いつつ、指向部に向かって流れる。このため、車両下側の空気を効率よく整流板の指向部に導くことができる。また、消音器の前方及び下側が各々整流板の傾斜部及び指向部によって覆われるため、車両走行中における路面からの飛び石等が上記整流板によって遮られ、こうした飛び石等が消音器に衝突するのを抑制することができる。更に、外筒から下方に向けての熱の放射を上記整流板によって遮断することができる。 Moreover, according to the said structure, the vehicle lower side air which flows toward the back during vehicle travels against the inclination part of a baffle plate, and flows toward the directivity part along the inclination part. For this reason, the air below the vehicle can be efficiently guided to the directing portion of the rectifying plate. In addition, since the front and lower sides of the silencer are respectively covered by the inclined portion and the directing portion of the rectifying plate, the stepping stones from the road surface while the vehicle is running are blocked by the rectifying plate, and such stepping stones collide with the silencer. Can be suppressed. Furthermore, the radiation of heat downward from the outer cylinder can be blocked by the rectifying plate.

請求項２記載の発明では、請求項１記載の発明において、前記整流板は前記外筒に設けられるものとした。
上記構成によれば、排気から消音器へと伝達される熱が外筒から整流板へと伝達される。そして、車両走行中には、整流板に沿って流れる空気と同整流板との間で熱交換が行われるため、消音器からの放熱を上記整流板を通じて効果的に行うことができる。 According to a second aspect of the present invention, in the first aspect of the present invention, the rectifying plate is provided on the outer cylinder.
According to the said structure, the heat transmitted from exhaust_gas | exhaustion to a silencer is transmitted from an outer cylinder to a baffle plate. And while driving | running | working a vehicle, since heat exchange is performed between the air which flows along a baffle plate, and the baffle plate, heat dissipation from a silencer can be effectively performed through the said baffle plate.

上記構成によれば、車両走行中に後方に向けて流れる車両下側の空気は、消音器の外筒の前側に当たって同外筒の外面に沿って後方に流れるため、その空気を外筒の下端から車両の下面における上記外筒よりも車両後方に位置する車体フロアに向かって延びる整流板へと効率よく導くことができる。   According to the above configuration, the vehicle lower air flowing backward while the vehicle is running hits the front side of the outer cylinder of the silencer and flows rearward along the outer surface of the outer cylinder. Can be efficiently guided from the outer cylinder on the lower surface of the vehicle to the current plate extending toward the vehicle body floor located behind the vehicle.

請求項３記載の発明では、請求項１または２に記載の発明において、前記整流板には車両の前後方向に延びるリブが形成されていることを要旨とした。
上記構成によれば、リブによって整流板の強度を高めることができる。また、このリブは車両の前後方向に延びるように形成されているため、車両走行時には同整流板に沿って流れる空気が上記リブに沿っても流れるようになる。従って、その空気の流れが車両の幅方向に歪んで乱れるのを抑制することができ、同空気の車両後方に向かう流れを一層スムーズなものとすることができる。 The invention according to claim 3 is summarized in that, in the invention according to claim 1 or 2 , the rectifying plate is formed with ribs extending in the front-rear direction of the vehicle.
According to the said structure, the intensity | strength of a baffle plate can be raised with a rib. Further, since the rib is formed so as to extend in the front-rear direction of the vehicle, the air flowing along the current plate also flows along the rib when the vehicle travels. Therefore, it can suppress that the flow of the air is distorted and disturbed in the width direction of the vehicle, and the flow of the air toward the rear of the vehicle can be made smoother.

請求項４記載の発明では、請求項３記載の発明において、前記リブは複数設けられており、それらリブの車両幅方向の間隔は車両の後方に向かうほど小となっていることを要旨とした。 In the invention of claim 4, wherein, in the invention of claim 3, wherein said rib is provided with a plurality, in the vehicle width direction between their ribs was summarized in that has a small enough toward the rear of the vehicle .

上記構成によれば、複数のリブにおける車両前方側の端部の車両幅方向の間隔を大とするほど、整流板によって車両の下面における外筒の車両後側に位置する車体フロアに向けて流れるよう整流される空気の流れが多くなる。また、複数のリブにおける車両後方側の端部の車両幅方向の間隔を小とするほど、車両走行中に整流板に沿って空気が流れるとき、その空気が整流板から車両後方に離れるときの同空気の流速が速くなる。従って、複数のリブにおける車両前方側の端部及び車両後方側の端部の車両幅方向の間隔を各々適宜調節することで、車両走行中に整流板に沿って流れる空気が当該整流板から車両後方に離れるときの同空気の流量及び流速を、車両下側の空気の流れを良好にするのに好ましい値へと調整することができる。   According to the above-described configuration, the larger the gap in the vehicle width direction of the front ends of the plurality of ribs, the larger the flow in the vehicle width toward the vehicle body floor located on the vehicle rear side of the outer cylinder on the lower surface of the vehicle. The flow of air to be rectified increases. In addition, the smaller the gap in the vehicle width direction at the vehicle rear side ends of the plurality of ribs, the more the air flows along the current plate while the vehicle travels, and the air is separated from the current plate toward the rear of the vehicle. The flow rate of the air becomes faster. Accordingly, the air flowing along the rectifying plate during the traveling of the vehicle can be adjusted from the rectifying plate to the vehicle by appropriately adjusting the distance in the vehicle width direction between the end portion on the vehicle front side and the end portion on the vehicle rear side of the plurality of ribs. The flow rate and flow velocity of the air when leaving the rear can be adjusted to preferred values for good air flow under the vehicle.

以下、本発明を自動車用の消音器に具体化した一実施形態を図１〜図４に従って説明する。
図１（ａ）は、自動車に搭載された内燃機関の排気系における消音器１周りを自動車の下面側から見た図である。消音器１には内燃機関に繋がる排気管２が接続されており、その排気管２を通って内燃機関の排気が消音器１の内部に導入される。また、消音器１には上記排気を外部に放出するための排気管３が接続されている。従って、内燃機関の排気は、排気管２、消音器１、及び排気管３を通って外部に排出される。そして、内燃機関の排気音は上記消音器１によって消音される。 Hereinafter, an embodiment in which the present invention is embodied in an automobile silencer will be described with reference to FIGS.
FIG. 1A is a view of the periphery of the silencer 1 in the exhaust system of an internal combustion engine mounted on an automobile as viewed from the lower surface side of the automobile. An exhaust pipe 2 connected to the internal combustion engine is connected to the silencer 1, and exhaust gas from the internal combustion engine is introduced into the silencer 1 through the exhaust pipe 2. The silencer 1 is connected to an exhaust pipe 3 for discharging the exhaust to the outside. Therefore, the exhaust gas of the internal combustion engine is discharged to the outside through the exhaust pipe 2, the silencer 1, and the exhaust pipe 3. The exhaust sound of the internal combustion engine is silenced by the silencer 1.

図１（ｂ）は、内燃機関の排気系における消音器１周りを自動車の側面側から見た図である。この消音器１は断面楕円形状に形成された外筒１ａを備えている。外筒１ａは金属からなる板状の素材を楕円形状に巻くことによって形成されている。こうした消音器１は、自動車の下面４に設けられた凹部５内に自動車の幅方向に延びた状態で取り付けられている。上記のように消音器１を自動車の下面４に形成された凹部５内に取り付けることで、下面４から下方への消音器１の突出量が可能な限り小さく抑えられるようになる。   FIG. 1 (b) is a view of the periphery of the silencer 1 in the exhaust system of the internal combustion engine as seen from the side of the automobile. The silencer 1 includes an outer cylinder 1a having an elliptical cross section. The outer cylinder 1a is formed by winding a plate-shaped material made of metal into an elliptical shape. Such a silencer 1 is mounted in a recess 5 provided on the lower surface 4 of the automobile in a state extending in the width direction of the automobile. By mounting the silencer 1 in the recess 5 formed on the lower surface 4 of the automobile as described above, the protruding amount of the silencer 1 downward from the lower surface 4 can be suppressed as small as possible.

ただし、消音器１全体を凹部５内に収めることはできず、消音器１の下部が下面４から下方に突出することは避けられないため、その突出した部分によって走行中における自動車の下側の空気の流れが消音器１の後方で乱れることは、［発明が解決しようとする課題］の欄に記載したとおりである。そして、このように走行中における自動車下側で空気の流れが乱れると、走行時における車両下側の空気の流れが滞り、自動車の走行中の空気抵抗が大となる。更に、自動車の下側の気圧が高くなって同自動車の上側と車両下側との気圧差が小となり、その気圧差に基づいて自動車を下方に抑えるように力が働くとき、その力が小さくなって自動車の安定走行に悪影響を及ぼすおそれがある。   However, since the entire silencer 1 cannot be housed in the recess 5 and the lower part of the silencer 1 cannot be avoided from projecting downward from the lower surface 4, the projecting portion of the silencer 1 lowers the vehicle during traveling. The fact that the air flow is disturbed behind the silencer 1 is as described in the section “Problems to be solved by the invention”. When the air flow is disturbed on the lower side of the vehicle while traveling as described above, the air flow on the lower side of the vehicle during traveling is delayed, and the air resistance during the traveling of the vehicle is increased. Furthermore, when the atmospheric pressure on the lower side of the automobile becomes higher and the atmospheric pressure difference between the upper side and the lower side of the automobile becomes small, and the force works to keep the automobile downward based on the atmospheric pressure difference, the force becomes small. This may adversely affect the stable driving of the car.

そこで本実施形態では、消音器１の外筒１ａの下側に、走行中における自動車下側の空気の流れが自動車の下面４における消音器１よりも自動車後方側に位置する車体フロア４ａに向かう流れとなるよう整流する整流板７を設けている。この整流板７は、自動車の下面４における消音器１よりも自動車後方側に位置する車体フロア４ａに向けて延びる平板状をなしており、溶接等によって外筒１ａの下側に取り付けられている。   Therefore, in the present embodiment, the air flow on the lower side of the automobile while traveling is directed to the vehicle body floor 4a located on the rear side of the automobile with respect to the silencer 1 on the lower surface 4 of the automobile, below the outer cylinder 1a of the silencer 1. A rectifying plate 7 for rectifying the flow is provided. The rectifying plate 7 has a flat plate shape extending toward the vehicle body floor 4a located on the rear side of the vehicle with respect to the silencer 1 on the lower surface 4 of the vehicle, and is attached to the lower side of the outer cylinder 1a by welding or the like. .

上記整流板７を設けた場合、自動車の走行中に後方に向けて流れる自動車下側の空気は、消音器１の外筒１ａの下側を通過する際、自動車の下面４における消音器１よりも自動車後方側に位置する車体フロア４ａに向けて延びる整流板７に沿って流れ、その後に整流板７よりも後方に流れることとなる。このように整流板７から離れた空気は、その直前まで自動車の下面４における消音器１よりも自動車後方側に位置する車体フロア４ａに向けて延びる整流板７に沿って図１（ｂ）の矢印Ｙ１方向に流れており、これによって整流板７から離れた後に上記下面４に向けて流れるよう方向づけられる。   When the rectifying plate 7 is provided, the air on the lower side of the vehicle that flows backward while the vehicle is running passes through the lower side of the outer cylinder 1a of the muffler 1 from the muffler 1 on the lower surface 4 of the vehicle. Also flows along the rectifying plate 7 extending toward the vehicle body floor 4a located on the rear side of the automobile, and then flows behind the rectifying plate 7. The air away from the rectifying plate 7 in this way is shown in FIG. 1B along the rectifying plate 7 extending toward the vehicle body floor 4a located on the rear side of the vehicle with respect to the silencer 1 on the lower surface 4 of the vehicle until just before that. It flows in the direction of arrow Y1, and is thereby directed to flow toward the lower surface 4 after leaving the rectifying plate 7.

ここで、自動車の走行中には消音器１の後方で気圧が低くなるが、整流板７から離れて後方に流れる空気は、上述したように自動車の下面４における消音器１の自動車後方側に位置する車体フロア４ａに向けて流れるよう方向づけられているため、消音器１の後方で上方に巻き込まれることは抑制される。その結果、整流板７から離れて後方に流れる空気は、自動車の下面４における消音器１よりも自動車後方側に位置する車体フロア４ａに沿って矢印Ｙ２方向に流れるようになる。従って、走行中の自動車下側の空気の流れが乱れて滞るのを抑制することができ、その空気の流れをスムーズなものとすることができる。   Here, while the automobile is running, the air pressure is lowered behind the silencer 1, but the air that flows backward away from the rectifying plate 7 is on the automobile rear side of the silencer 1 on the lower surface 4 of the automobile as described above. Since it is directed to flow toward the vehicle body floor 4a located, it is suppressed that it is caught up behind the silencer 1. As a result, the air that flows backward from the rectifying plate 7 flows in the direction of the arrow Y2 along the vehicle body floor 4a that is located on the vehicle rear side with respect to the silencer 1 on the lower surface 4 of the vehicle. Accordingly, it is possible to suppress the air flow under the traveling vehicle from being disturbed and stagnant, and to smooth the air flow.

このように、走行中における自動車下側の空気の流れがスムーズとなることで、自動車走行中の空気抵抗が大となるのを抑制することができる。更に、消音器１よりも後ろの自動車下側の気圧を低くして自動車の上側と下側との気圧差を大きい値に保つことができ、その気圧差に基づいて自動車を下方に抑えるように力が働くとき、その力が小さくなって自動車の安定走行に悪影響を及ぼすのを抑制することもできる。   As described above, since the air flow on the lower side of the automobile during traveling is smooth, it is possible to suppress an increase in air resistance during traveling of the automobile. Further, the pressure on the lower side of the vehicle behind the silencer 1 can be lowered to keep the pressure difference between the upper side and the lower side of the vehicle at a large value, and the vehicle is suppressed downward based on the pressure difference. When the force works, it can be suppressed that the force is reduced and adversely affects the stable driving of the automobile.

次に、消音器１の外筒１ａの下側に設けられた整流板７の形状について、図２〜図４を参照して詳しく説明する。
図２は、図１（ｂ）に示される整流板７の拡大図である。図２に示されるように、整流板７は、鈍角に屈曲しており、消音器１の外筒１ａの下側にて自動車の下面４における消音器１よりも自動車後方側に位置する車体フロア４ａに向けて延びる指向部７ａと、その指向部７ａの自動車前方側に位置して自動車の前方に向かうほど上記下面４に接近するよう傾斜する傾斜部７ｂとを備えている。なお、指向部７ａにおける自動車の前後方向の長さについては、自動車の走行中に指向部７ａに沿って流れた後に整流板７から自動車後方に流れる空気が消音器１の後方で上方に巻き込まれることなく、消音器１の自動車後方側に位置する車体フロア４ａに到達するよう、上記空気の流れを方向づけることの可能な長さに設定されている。具体的には、指向部７ａにおける自動車の前後方向の長さは、消音器１における自動車の前後方向の長さの１０％以上の長さに設定されている。 Next, the shape of the current plate 7 provided on the lower side of the outer cylinder 1a of the silencer 1 will be described in detail with reference to FIGS.
FIG. 2 is an enlarged view of the current plate 7 shown in FIG. As shown in FIG. 2, the rectifying plate 7 is bent at an obtuse angle, and is located below the outer cylinder 1 a of the silencer 1 and located on the vehicle rear side of the lower surface 4 of the vehicle, rather than the silencer 1. A directing portion 7a extending toward 4a and an inclined portion 7b that is positioned on the front side of the automobile of the directing portion 7a and that inclines so as to approach the lower surface 4 toward the front of the automobile. Regarding the length of the automobile in the front-rear direction in the directing portion 7a, the air that flows along the directing portion 7a and travels from the rectifying plate 7 to the rear of the automobile while the vehicle is running is wound upward behind the silencer 1. Instead, the air flow is set to a length that can direct the air flow so as to reach the vehicle body floor 4a located on the vehicle rear side of the silencer 1. Specifically, the length in the front-rear direction of the automobile in the directing portion 7a is set to a length of 10% or more of the length in the front-rear direction of the automobile in the silencer 1.

この構成により、自動車の走行中に後方に向けて流れる自動車下側の空気は、図中の矢印Ｙ３で示されるように、整流板７の傾斜部７ｂに当たって同傾斜部７ｂに沿いつつ、指向部７ａに向かって流れる。このため、自動車下側の空気を効率よく整流板７の指向部７ａに導くことができる。また、消音器１の前方及び下側が各々整流板７の傾斜部７ｂ及び指向部７ａによって覆われるため、自動車の走行中における路面からの飛び石等が上記整流板７によって遮られ、こうした飛び石等が消音器１に衝突するのを抑制することができる。更に、整流板７には消音器１の外筒１ａからの熱が伝達され、自動車の走行中に整流板７に沿って流れる空気と同整流板７との間で熱交換が行われるため、消音器１からの放熱を上記整流板７を通じて効果的に行うことができる。   With this configuration, the air on the lower side of the vehicle that flows backward while the vehicle is traveling hits the inclined portion 7b of the rectifying plate 7 along the inclined portion 7b as shown by the arrow Y3 in the drawing, and the directing portion It flows toward 7a. For this reason, the air under the automobile can be efficiently guided to the directing portion 7 a of the rectifying plate 7. Further, since the front and lower sides of the silencer 1 are respectively covered with the inclined portion 7b and the directing portion 7a of the rectifying plate 7, stepping stones from the road surface while the vehicle is running are blocked by the rectifying plate 7, and such stepping stones are prevented. A collision with the silencer 1 can be suppressed. Furthermore, heat from the outer cylinder 1a of the silencer 1 is transmitted to the rectifying plate 7, and heat exchange is performed between the air flowing along the rectifying plate 7 and the rectifying plate 7 during the traveling of the automobile. Heat dissipation from the silencer 1 can be effectively performed through the rectifying plate 7.

図３において、（ａ）は整流板７を自動車の下側から見た図であり、（ｂ）は（ａ）の整流板７を矢印Ｋ方向から見た断面図である。また、図４において、（ａ）は図４（ａ）の整流板７を矢印Ａ方向から見た側面図であり、（ｂ）〜（ｉ）はそれぞれ上記整流板７を矢印Ｂ、Ｃ、Ｄ、Ｅ、Ｆ、Ｇ、Ｈ、Ｊ方向から見た断面図である。図３（ａ）に示されるように、整流板７には自動車の前後方向（図中の左右方向）に延びる複数のリブ８が互いに平行となるように形成されている。これらリブ８は、図３（ｂ）に示されるように、整流板７を下方（図中左方）に向けて突出するよう折り曲げることによって形成されている。そして、これらリブ８は、整流板７における指向部７ａと傾斜部７ｂとの両方に亘って、自動車の前後方向に延びている。   3A is a view of the rectifying plate 7 viewed from the lower side of the automobile, and FIG. 3B is a cross-sectional view of the rectifying plate 7 of FIG. 4A is a side view of the rectifying plate 7 of FIG. 4A viewed from the direction of the arrow A, and FIGS. 4B to 4I are views of the rectifying plate 7 with the arrows B, C, It is sectional drawing seen from D, E, F, G, H, and J direction. As shown in FIG. 3A, the current plate 7 is formed with a plurality of ribs 8 extending in the front-rear direction (left-right direction in the drawing) of the automobile so as to be parallel to each other. As shown in FIG. 3B, these ribs 8 are formed by bending the current plate 7 so as to protrude downward (leftward in the figure). And these ribs 8 are extended in the front-back direction of a motor vehicle over both the direction part 7a and the inclination part 7b in the baffle plate 7. FIG.

こうしたリブ８を整流板７に形成することにより、同整流板７の強度を高めることができる。また、自動車の走行中には整流板７に沿って流れる空気が自動車の前後方向に延びる各リブ８に沿っても流れるため、その空気の流れが自動車の幅方向（図３の上下方向）に歪んで乱れるのを抑制することができ、同空気の自動車の後方側に向かう流れを一層スムーズなものとすることができる。   By forming such ribs 8 on the current plate 7, the strength of the current plate 7 can be increased. Further, since the air flowing along the rectifying plate 7 also flows along the ribs 8 extending in the front-rear direction of the vehicle while the vehicle is running, the air flow is in the width direction of the vehicle (vertical direction in FIG. 3). Distortion and distortion can be suppressed, and the flow of the air toward the rear side of the automobile can be made smoother.

以上詳述した本実施形態によれば、以下に示す効果が得られるようになる。
（１）自動車の走行中に後方に向けて流れる自動車下側の空気は、消音器１の外筒１ａの下側に設けられた整流板７に沿って流れることにより、整流板７から離れた後に自動車の下面４における消音器１よりも自動車後方側に位置する車体フロア４ａに向けて流れるよう方向づけられる。このため、整流板７から離れて後方に流れた空気は、消音器１の後方で上方に巻き込まれることなく、自動車の下面４における消音器１よりも自動車後方側に位置する車体フロア４ａに沿って流れ、自動車の後方に抜けることになる。従って、走行中の自動車下側の空気の流れが乱れて滞るのを抑制することができ、その空気の流れをスムーズなものとすることができる。 According to the embodiment described in detail above, the following effects can be obtained.
(1) The air on the lower side of the vehicle that flows backward while the vehicle is running is separated from the current plate 7 by flowing along the current plate 7 provided on the lower side of the outer cylinder 1a of the silencer 1. It is directed so as to flow toward the vehicle body floor 4a located on the rear side of the vehicle later than the silencer 1 on the lower surface 4 of the vehicle. For this reason, the air that has flowed rearward away from the rectifying plate 7 does not get caught up behind the silencer 1, and is along the vehicle body floor 4 a located on the vehicle rear side of the silencer 1 on the lower surface 4 of the vehicle. Will flow to the back of the car. Accordingly, it is possible to suppress the air flow under the traveling vehicle from being disturbed and stagnant, and to smooth the air flow.

（２）走行中における自動車下側の空気の流れがスムーズとなることで、自動車走行中の空気抵抗が大となるのを抑制することができる。更に、消音器１よりも後ろの自動車下側の気圧を低くして自動車の上側と下側との気圧差を大きい値に保つことができ、その気圧差に基づいて自動車を下方に抑えるように力が働くとき、その力が小さくなって自動車の安定走行に悪影響を及ぼすのを抑制することもできる。   (2) Since the air flow on the lower side of the automobile during traveling is smooth, it is possible to suppress an increase in air resistance during traveling of the automobile. Further, the pressure on the lower side of the vehicle behind the silencer 1 can be lowered to keep the pressure difference between the upper side and the lower side of the vehicle at a large value, and the vehicle is suppressed downward based on the pressure difference. When the force works, it can be suppressed that the force is reduced and adversely affects the stable driving of the automobile.

（３）整流板７は、消音器１の外筒１ａの下側にて自動車の下面４における消音器１よりも自動車後方側に位置する車体フロア４ａに向けて延びる指向部７ａと、その指向部７ａの自動車前方側に位置して自動車の前方に向かうほど上記下面４に接近するよう傾斜する傾斜部７ｂとを備えている。このため、自動車の走行中に後方に向けて流れる自動車下側の空気は、整流板７の傾斜部７ｂに当たって同傾斜部７ｂに沿いつつ、指向部７ａに向かって流れる。従って、自動車下側の空気を効率よく整流板７の指向部７ａに導くことができる。   (3) The rectifying plate 7 has a directing portion 7a that extends toward the vehicle body floor 4a located on the rear side of the vehicle below the silencer 1 on the lower surface 4 of the vehicle below the outer cylinder 1a of the silencer 1, and its directivity. It is provided with an inclined portion 7b which is located on the front side of the automobile of the portion 7a and is inclined so as to approach the lower surface 4 toward the front of the automobile. Therefore, the air on the lower side of the vehicle that flows backward while the vehicle is traveling hits the inclined portion 7b of the current plate 7 and flows toward the directing portion 7a along the inclined portion 7b. Therefore, the air under the automobile can be efficiently guided to the directing portion 7a of the rectifying plate 7.

（４）内燃機関の排気が消音器１を通過するとき、その排気の熱が消音器１に伝達される。このように消音器１に伝達された熱は外筒１ａを介して整流板７に伝達される。そして自動車の走行中には、整流板７に沿って流れる空気と同整流板７との間で熱交換が行われるため、消音器１からの放熱を上記整流板７を通じて効果的に行うことができる。   (4) When the exhaust gas of the internal combustion engine passes through the silencer 1, the heat of the exhaust gas is transmitted to the silencer 1. Thus, the heat transmitted to the silencer 1 is transmitted to the rectifying plate 7 through the outer cylinder 1a. During the traveling of the automobile, heat exchange is performed between the air flowing along the rectifying plate 7 and the rectifying plate 7, so that heat dissipation from the silencer 1 can be effectively performed through the rectifying plate 7. it can.

（５）消音器１の前方及び下側が各々整流板７の傾斜部７ｂ及び指向部７ａによって覆われるため、自動車の走行中における路面からの飛び石等が上記整流板７によって遮られ、こうした飛び石等が消音器１に衝突するのを抑制することができる。   (5) Since the front and lower sides of the silencer 1 are respectively covered with the inclined portion 7b and the directing portion 7a of the rectifying plate 7, stepping stones from the road surface while the vehicle is running are blocked by the rectifying plate 7, and such stepping stones and the like Can be prevented from colliding with the silencer 1.

（６）整流板７に複数のリブ８を形成したため、整流板の強度を高めることができる。
（７）上記各リブ８は自動車の前後方向に延びるように形成されており、自動車の走行中には整流板７に沿って流れる空気が各リブ８に沿っても流れる。このため、上記空気の流れが自動車の幅方向に歪んで乱れるのを抑制することができ、同空気の自動車の後方側に向かう流れを一層スムーズなものとすることができる。 (6) Since the plurality of ribs 8 are formed on the rectifying plate 7, the strength of the rectifying plate can be increased.
(7) The ribs 8 are formed so as to extend in the front-rear direction of the automobile, and the air flowing along the current plate 7 also flows along the ribs 8 while the automobile is running. For this reason, it can suppress that the flow of the air is distorted and disturbed in the width direction of the automobile, and the flow of the air toward the rear side of the automobile can be made smoother.

（８）リブ８を整流板７の折り曲げにより形成しているため、整流板７の重量増加を抑えつつ整流板７の強度を高めることができる。
なお、上記実施形態は、例えば以下のように変更することもできる。 (8) Since the rib 8 is formed by bending the rectifying plate 7, the strength of the rectifying plate 7 can be increased while suppressing an increase in the weight of the rectifying plate 7.
In addition, the said embodiment can also be changed as follows, for example.

・上記実施形態では、図５（ａ）に示されるように、各リブ８を自動車の前後方向に互いに平行となるように形成したが、本発明はこれに限定されない。例えば、図５（ｂ）に示されるように、各リブ８の自動車の幅方向（図中上下方向）の間隔が自動車の後方に向かうほど小となるよう各リブ８を形成してもよい。この場合、複数のリブ８における自動車前方側の端部の上記幅方向の間隔を大とするほど、整流板７によって自動車の下面４における消音器１の自動車後側に位置する車体フロア４ａに向けて流れるよう整流される空気の流れが多くなる。また、複数のリブ８における自動車後方側の端部の上記幅方向の間隔を小とするほど、自動車の走行中に整流板７に沿って空気が流れるとき、その空気が整流板７から自動車の後方に離れるときの同空気の流速が速くなる。従って、複数のリブ８における自動車の前方側の端部及び後方側の端部の上記間隔を適宜調節することで、自動車走行中に整流板７に沿って流れる空気が当該整流板７から自動車後方に離れるときの同空気の流量及び流速を、自動車下側の空気の流れを良好にするのに好ましい値へと調整することができる。   In the above embodiment, as shown in FIG. 5A, the ribs 8 are formed so as to be parallel to each other in the longitudinal direction of the automobile, but the present invention is not limited to this. For example, as shown in FIG. 5B, the ribs 8 may be formed such that the distance between the ribs 8 in the width direction (vertical direction in the figure) of the automobile becomes smaller toward the rear of the automobile. In this case, the larger the gap in the width direction of the end portions of the plurality of ribs 8 on the front side of the vehicle, the larger the gap in the width direction toward the vehicle body floor 4a located on the vehicle rear side of the silencer 1 on the lower surface 4 of the vehicle. The flow of air that is rectified so as to flow increases. Further, the smaller the gap in the width direction of the end portions on the rear side of the automobile in the plurality of ribs 8, the more the air flows along the current plate 7 while the vehicle is running, the air flows from the current plate 7 to the vehicle. The flow velocity of the air when moving backward is increased. Accordingly, by appropriately adjusting the distance between the front end and the rear end of the automobile in the plurality of ribs 8, the air flowing along the current plate 7 while the vehicle is running from the current plate 7 to the rear of the vehicle. The flow rate and flow velocity of the air when moving away from the vehicle can be adjusted to values favorable for good air flow under the automobile.

・リブ８を複数設けたが、一つだけにしてもよい。この場合でも、上記（６）及び（７）に準じた効果を得ることができる。
・リブ８については必ずしも設ける必要はない。 Although a plurality of ribs 8 are provided, only one rib may be provided. Even in this case, the effects according to the above (6) and (7) can be obtained.
-The rib 8 is not necessarily provided.

・板状の素材を楕円状形状に巻いて外筒１ａを形成する際、図６に示されるように素材の巻き終わりの部分を二カ所で屈曲させて指向部７ａ及び傾斜部７ｂを形成し、上記素材の巻き終わりの部分を指向部７ａ及び傾斜部７ｂを備える整流板として機能させてもよい。この場合、外筒１ａの形成と同時に指向部７ａ及び傾斜部７ｂが形成され、整流板７が外筒１ａと一体的に設けられるため、整流板７を外筒１ａに溶接等によって取り付ける作業が必要なくなる。また、排気から消音器１に伝達された熱が外筒１ａを介して指向部７ａ及び傾斜部７ｂに伝達されやすくなり、消音器１から指向部７ａ及び傾斜部７ｂを介しての放熱がより効果的に行われるようになる。   When the outer material 1a is formed by winding a plate-shaped material into an elliptical shape, the directing portion 7a and the inclined portion 7b are formed by bending the winding end portion of the material at two places as shown in FIG. The winding end portion of the material may function as a current plate including the directing portion 7a and the inclined portion 7b. In this case, since the directing portion 7a and the inclined portion 7b are formed simultaneously with the formation of the outer cylinder 1a, and the rectifying plate 7 is provided integrally with the outer cylinder 1a, the work of attaching the rectifying plate 7 to the outer cylinder 1a by welding or the like. No longer needed. In addition, heat transmitted from the exhaust to the silencer 1 is easily transmitted to the directing portion 7a and the inclined portion 7b through the outer cylinder 1a, and heat radiation from the silencer 1 through the directing portion 7a and the inclined portion 7b is further improved. To be effective.

・整流板７を自動車の下面など外筒１ａ以外の箇所に取り付けたり、断熱材を介して外筒１ａに取り付けたりしてもよい。この場合、外筒１ａから整流板７への熱伝達が行われにくくなり、消音器１から下方に向けての熱の放射を上記整流板７によって遮断することができる。   -You may attach the baffle plate 7 to places other than the outer cylinder 1a, such as the lower surface of a motor vehicle, or you may attach to the outer cylinder 1a via a heat insulating material. In this case, heat transfer from the outer cylinder 1 a to the rectifying plate 7 is difficult to be performed, and radiation of heat from the silencer 1 downward can be blocked by the rectifying plate 7.

・図７に示されるように、整流板７として外筒１ａの下端ＬＥから自動車の下面４における外筒１ａよりも自動車後方に位置する車体フロア４ａに向かって延びるものを採用してもよい。この場合、自動車の走行中に後方に向けて流れる自動車下側の空気は、矢印Ｙ５に示されるように消音器１の外筒１ａの前側に当たって同外筒１ａの外面に沿って後方に流れるため、その空気を外筒１ａの下端ＬＥから自動車の下面４における外筒１ａの自動車後方側に位置する車体フロア４ａに向かって延びる整流板７へと効率よく導くことができる。また、上記（１）及び（２）と同等の効果も得られるようになる。   As shown in FIG. 7, a plate that extends from the lower end LE of the outer cylinder 1 a toward the vehicle body floor 4 a located behind the outer cylinder 1 a on the lower surface 4 of the automobile may be adopted as the rectifying plate 7. In this case, since the air on the lower side of the automobile that flows backward while the automobile is running hits the front side of the outer cylinder 1a of the silencer 1 and flows rearward along the outer surface of the outer cylinder 1a as indicated by the arrow Y5. The air can be efficiently guided from the lower end LE of the outer cylinder 1a to the current plate 7 extending toward the vehicle body floor 4a located on the rear side of the outer cylinder 1a on the lower surface 4 of the automobile. In addition, the same effects as in the above (1) and (2) can be obtained.

（ａ）及び（ｂ）は、自動車に搭載された内燃機関の排気系における消音器周りを自動車の下面側から見た図、及び上記背景系の消音器周りを自動車の側面側から見た図。(A) And (b) is the figure which looked at the silencer periphery in the exhaust system of the internal combustion engine mounted in the motor vehicle from the lower surface side of the motor vehicle, and the figure which looked at the silencer periphery of the said background system from the side surface side of the motor vehicle. . 消音器の整流板を示す側面図。The side view which shows the baffle plate of a silencer. （ａ）は整流板を自動車の下側から見た図であり、（ｂ）は上記（ａ）の整流板を矢印Ｋ方向から見た断面図である。(A) is the figure which looked at the baffle plate from the vehicle lower side, (b) is sectional drawing which looked at the baffle plate of said (a) from the arrow K direction. （ａ）は図３（ａ）の整流板を矢印Ａ方向から見た側面図であり、（ｂ）〜（ｉ）はそれぞれ上記整流板を矢印Ｂ、Ｃ、Ｄ、Ｅ、Ｆ、Ｇ、Ｈ、Ｊ方向から見た断面図である。(A) is the side view which looked at the baffle plate of Fig.3 (a) from the arrow A direction, (b)-(i) respectively shows the said baffle plate by arrow B, C, D, E, F, G, It is sectional drawing seen from the H and J directions. （ａ）は実施形態におけるリブの形成態様を示す模式図であり、（ｂ）は上記リブの形成態様の他の例を示す模式図である。(A) is a schematic diagram which shows the formation aspect of the rib in embodiment, (b) is a schematic diagram which shows the other example of the formation aspect of the said rib. 消音器の外筒の他の例を示す模式図。The schematic diagram which shows the other example of the outer cylinder of a silencer. 整流板の他の例を示す消音器周りの側面図。The side view around the silencer which shows the other example of a baffle plate. 内燃機関の排気系における消音器周りの従来例を示す模式図。The schematic diagram which shows the prior art example around the silencer in the exhaust system of an internal combustion engine. 上記消音器の下端周辺を拡大した模式図。The schematic diagram which expanded the lower end periphery of the said silencer.

符号の説明Explanation of symbols

１…消音器、１ａ…外筒、２…排気管、３…排気管、４…下面、４ａ…車体フロア、５…凹部、７…整流板、７ａ…指向部、７ｂ…傾斜部、８…リブ。   DESCRIPTION OF SYMBOLS 1 ... Silencer, 1a ... Outer cylinder, 2 ... Exhaust pipe, 3 ... Exhaust pipe, 4 ... Lower surface, 4a ... Vehicle body floor, 5 ... Recessed part, 7 ... Current plate, 7a ... Direction part, 7b ... Inclined part, 8 ... rib.

Claims (4)

断面略円形状の外筒を備えており、車両の下面に同車両の幅方向に延びるように取り付けられる消音器において、
前記外筒の下側には車両走行時における車両下側の空気の流れが車両の下面における前記外筒の車両後方側に位置する車体フロアに向かう流れとなるよう整流する整流板が設けられ、
前記整流板は、車両の下面における前記外筒よりも車両後方側に位置する車体フロアに向けて延びるものであり、
かつ鈍角に屈曲しており、前記外筒の下側にて車両の下面における前記外筒よりも車両後方に位置する車体フロアに向けて延びる指向部と、その指向部の車両前方側に位置して車両の前方に向かうほど同車両の下面に接近するよう傾斜する傾斜部とを備えていることを特徴とする消音器。 In a silencer that includes an outer cylinder having a substantially circular cross section and is attached to the lower surface of the vehicle so as to extend in the width direction of the vehicle.
A rectifying plate is provided on the lower side of the outer cylinder to rectify the flow of air on the lower side of the vehicle during vehicle travel so as to flow toward the vehicle body floor located on the vehicle rear side of the outer cylinder on the lower surface of the vehicle .
The rectifying plate extends toward the vehicle body floor located on the vehicle rear side of the outer cylinder on the lower surface of the vehicle,
And, it is bent at an obtuse angle, and is located on the vehicle front side of the directing portion that extends toward the vehicle body floor located behind the outer cylinder on the lower surface of the vehicle and behind the outer cylinder on the lower surface of the vehicle. And a sloping portion that inclines so as to approach the lower surface of the vehicle toward the front of the vehicle . 前記整流板は前記外筒に設けられるものである請求項１記載の消音器。 The silencer according to claim 1 , wherein the rectifying plate is provided on the outer cylinder. 前記整流板には車両の前後方向に延びるリブが形成されている請求項１または２に記載の消音器。 The silencer according to claim 1 or 2 , wherein a rib extending in a longitudinal direction of the vehicle is formed on the current plate. 前記リブは複数設けられており、それらリブの車両幅方向の間隔は車両の後方に向かうほど小となっている請求項３記載の消音器。 The silencer according to claim 3, wherein a plurality of the ribs are provided, and an interval between the ribs in the vehicle width direction becomes smaller toward the rear of the vehicle.
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