JP6493180B2 - Exhaust pipe for engine - Google Patents

Exhaust pipe for engine Download PDF

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JP6493180B2
JP6493180B2 JP2015236017A JP2015236017A JP6493180B2 JP 6493180 B2 JP6493180 B2 JP 6493180B2 JP 2015236017 A JP2015236017 A JP 2015236017A JP 2015236017 A JP2015236017 A JP 2015236017A JP 6493180 B2 JP6493180 B2 JP 6493180B2
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exhaust
pipe
condensed water
vehicle
exhaust pipe
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JP2017101613A (en
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將嗣 浅野
將嗣 浅野
康彦 香田
康彦 香田
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Toyota Motor Corp
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Description

本発明は、機関用の排気管に関する。   The present invention relates to an exhaust pipe for an engine.

車両に取り付けられる機関用の排気管には、リヤサスペンション等の構造物を回避するために、車両後方に向かって斜め上方に延びる傾斜管部を設けることがある（例えば特許文献１等）。   An engine exhaust pipe attached to a vehicle may be provided with an inclined pipe portion that extends obliquely upward toward the rear of the vehicle in order to avoid structures such as a rear suspension (for example, Patent Document 1).

特開平１０−１３１７４５号公報JP-A-10-131745

ところで、内燃機関から排出された排気が冷やされると、排気中の水蒸気が液化して凝縮水が発生し、その凝縮水が排気管内の下部に溜まるようになる。排気管内に溜まる凝縮水は、排気の流勢によって排気管内を排気下流方向に移動していくのであるが、上述したような傾斜管部が存在すると凝縮水はその傾斜管部を超えにくいため、傾斜管部よりも排気下流側に移動しにくくなり、排気管末端の開口部から排出される凝縮水の量が減少してしまう。そのため、排気管からの凝縮水の排水性が低下するようになる。   By the way, when the exhaust gas discharged from the internal combustion engine is cooled, the water vapor in the exhaust gas is liquefied to generate condensed water, and the condensed water is accumulated in the lower part in the exhaust pipe. The condensed water accumulated in the exhaust pipe moves in the exhaust pipe in the exhaust downstream direction due to the flow of the exhaust, but if there is an inclined pipe portion as described above, the condensed water is unlikely to exceed the inclined pipe portion, It becomes more difficult to move to the exhaust downstream side than the inclined pipe portion, and the amount of condensed water discharged from the opening at the end of the exhaust pipe is reduced. Therefore, the drainage property of the condensed water from an exhaust pipe will fall.

このようにして凝縮水の排水性が低下すると、例えば、外気温の低下による凝縮水の凍結により、排気管内における排気の通路断面積が減少したり、場合によっては排気管内が閉塞したりするおそれがある。   When the drainage of condensed water is reduced in this way, for example, there is a risk that the cross-sectional area of the exhaust passage in the exhaust pipe will decrease or the inside of the exhaust pipe may be blocked due to freezing of the condensed water due to a decrease in the outside air temperature. There is.

ちなみに、上記文献１に記載の排気管では、凝縮水を排出するための孔を排気管の途中に設けるようにしている。しかし、そうした孔を設けると排気管の途中で排気が漏れてしまうため、排気管内における排気の流勢が弱まってしまう。そのため、排気管末端の開口部から排出される凝縮水の量が減少してしまい、凝縮水の排水性が低下するおそれがある。   Incidentally, in the exhaust pipe described in Document 1, a hole for discharging condensed water is provided in the middle of the exhaust pipe. However, if such a hole is provided, the exhaust gas leaks in the middle of the exhaust pipe, so that the flow of exhaust gas in the exhaust pipe is weakened. Therefore, the amount of condensed water discharged from the opening at the end of the exhaust pipe is reduced, and the drainage of condensed water may be deteriorated.

本発明は、こうした実情に鑑みてなされたものであり、その解決しようとする課題は、管内に溜まる凝縮水の排水性を向上させることのできる機関用の排気管を提供することにある。   The present invention has been made in view of such circumstances, and a problem to be solved is to provide an exhaust pipe for an engine that can improve drainage of condensed water accumulated in the pipe.

上記課題を解決する排気管は、車両に取り付けられる機関用の排気管であって、直線状の管部と、前記管部の排気下流端に設けられており車両後方に向かって斜め上方に延びる傾斜管部と、を有している。そして、前記管部における車両下方の壁面には、同管部の内側に向かって突出する突起が設けられている。   An exhaust pipe that solves the above problem is an exhaust pipe for an engine that is attached to a vehicle, and is provided at a straight pipe portion and an exhaust downstream end of the pipe portion, and extends obliquely upward toward the rear of the vehicle. And an inclined pipe portion. And the protrusion which protrudes toward the inner side of the said pipe part is provided in the wall surface below the vehicle in the said pipe part.

同構成によれば、排気の流勢によって凝縮水が排気管内を移動していき、上記管部の突起に到達すると、凝縮水は突起によって跳ね上げられ、突起の壁面から剥離する。ここで、突起は排気管において絞り部となるため、排気が突起を通過する際にはその流速が高められる。そのため、上記剥離した凝縮水は、流速の高められた排気によって加速されながら排気と共に排気下流側に送られるようになり、これにより凝縮水は上記傾斜管部を超えて排気下流側に流されやすくなる。従って、同構成によれば、管内に溜まる凝縮水の排水性が向上するようになる。   According to this configuration, the condensed water moves in the exhaust pipe due to the flow of the exhaust gas. When the condensed water reaches the projection of the pipe portion, the condensed water is splashed by the projection and peeled off from the wall surface of the projection. Here, since the projection serves as a throttle portion in the exhaust pipe, the flow velocity is increased when the exhaust passes through the projection. Therefore, the separated condensed water is sent to the exhaust downstream side together with the exhaust gas while being accelerated by the exhaust gas having an increased flow velocity, so that the condensed water easily flows to the exhaust downstream side beyond the inclined pipe portion. Become. Therefore, according to the same structure, the drainage property of the condensed water collected in a pipe | tube improves.

一実施形態の機関用の排気管が設けられた車両の排気系を示す側面図。The side view which shows the exhaust system of the vehicle provided with the exhaust pipe for engines of one Embodiment. 同車両を上方から見たときの排気系を示す平面図。FIG. 2 is a plan view showing an exhaust system when the vehicle is viewed from above. 図１に示すＡ部を拡大した排気管の断面図。Sectional drawing of the exhaust pipe which expanded the A section shown in FIG. 図３に示すＢ−Ｂ線に沿った排気管の断面図。Sectional drawing of an exhaust pipe along the BB line shown in FIG. 同実施形態の排気管内における凝縮水の動きを説明するための排気管の部分断面図。The fragmentary sectional view of the exhaust pipe for demonstrating the motion of the condensed water in the exhaust pipe of the embodiment. 同実施形態の排気管内における凝縮水の動きを説明するための排気管の部分断面図。The fragmentary sectional view of the exhaust pipe for demonstrating the motion of the condensed water in the exhaust pipe of the embodiment. 同実施形態の変形例における排気管の構造を示す断面図。Sectional drawing which shows the structure of the exhaust pipe in the modification of the embodiment.

以下、車両に取り付けられる機関用の排気管についてその一実施形態を、図１〜図６を参照して説明する。
なお、各図において、車両前方を矢印ＦＲで示し、車両上方向を矢印ＵＰで示す。 Hereinafter, an embodiment of an exhaust pipe for an engine attached to a vehicle will be described with reference to FIGS.
In each figure, the front of the vehicle is indicated by an arrow FR, and the upward direction of the vehicle is indicated by an arrow UP.

図１及び図２に示すように、車両１００の前部には、内燃機関１０が搭載されている。内燃機関１０の排気ポートには、エキゾーストマニホールド２０が接続されている。エキゾーストマニホールド２０の排気下流端には、排気を浄化する触媒装置３０が接続されている。触媒装置３０の排気下流端には、触媒装置３０を通過した排気が流れる第１排気管４１が接続されている。第１排気管４１の排気下流端には、排気の熱を利用して機関冷却水を昇温させる周知の排熱回収器５０が接続されている。排熱回収器５０の排気下流端には、第２排気管４２が接続されている。第２排気管４２の排気下流端には、排気騒音を低減する消音器６０が接続されている。排熱回収器５０、第２排気管４２、及び消音器６０は、車両１００のアンダーフロアに吊り下げられている。   As shown in FIGS. 1 and 2, an internal combustion engine 10 is mounted on the front portion of the vehicle 100. An exhaust manifold 20 is connected to the exhaust port of the internal combustion engine 10. A catalyst device 30 for purifying exhaust gas is connected to the exhaust downstream end of the exhaust manifold 20. A first exhaust pipe 41 through which exhaust gas that has passed through the catalyst device 30 flows is connected to the exhaust gas downstream end of the catalyst device 30. A well-known exhaust heat recovery unit 50 is connected to the exhaust downstream end of the first exhaust pipe 41 to raise the temperature of the engine coolant using the heat of the exhaust. A second exhaust pipe 42 is connected to the exhaust downstream end of the exhaust heat recovery device 50. A silencer 60 for reducing exhaust noise is connected to the exhaust downstream end of the second exhaust pipe 42. The exhaust heat recovery device 50, the second exhaust pipe 42, and the silencer 60 are suspended from the under floor of the vehicle 100.

第２排気管４２は、第１管部４２Ａ〜第５管部４２Ｋ及び第１屈曲部４２Ｂ〜第５屈曲部４２Ｌを有している。
第１管部４２Ａは、排熱回収器５０の排気下流端から車両前後方向に延びる直線状の管であり、この第１管部４２Ａの排気下流端には、第２排気管４２を車幅方向に曲げるための第１屈曲部４２Ｂが設けられている。そして、この第１屈曲部４２Ｂの排気下流端には車幅方向に延びる直線状の第２管部４２Ｃが設けられている。 The second exhaust pipe 42 includes a first pipe part 42A to a fifth pipe part 42K and a first bent part 42B to a fifth bent part 42L.
The first pipe portion 42A is a straight pipe extending in the vehicle front-rear direction from the exhaust downstream end of the exhaust heat recovery device 50. The second exhaust pipe 42 is connected to the exhaust downstream end of the first pipe portion 42A. A first bent portion 42B for bending in the direction is provided. A straight second pipe portion 42C extending in the vehicle width direction is provided at the exhaust downstream end of the first bent portion 42B.

第２管部４２Ｃの排気下流端には、車幅方向に曲げられた第２排気管４２を再び車両前後方向に向けて曲げるための第２屈曲部４２Ｄが設けられており、この第２屈曲部４２Ｄの排気下流端には車両前後方向に延びる直線状の第３管部４２Ｅが設けられている。   A second bent portion 42D for bending the second exhaust pipe 42 bent in the vehicle width direction toward the vehicle longitudinal direction again is provided at the exhaust downstream end of the second pipe portion 42C. A straight third pipe portion 42E extending in the vehicle front-rear direction is provided at the exhaust downstream end of the portion 42D.

第３管部４２Ｅの排気下流端には、車両１００の後輪１１０を懸架する懸架装置に第２排気管４２が当たるのを避ける目的で、第２排気管４２を車両後方に向かって斜め上方に曲げるための第３屈曲部４２Ｆが設けられている。この第３屈曲部４２Ｆの排気下流端には、車両後方に向かって斜め上方に延びる第４管部４２Ｇが設けられている。こうした、第３屈曲部４２Ｆ及び第４管部４２Ｇを第２排気管４２に設けることにより、第２排気管４２には、第３管部４２Ｅの排気下流端に設けられており車両後方に向かって斜め上方に延びる傾斜管部Ｋが形成されている。   In order to avoid the second exhaust pipe 42 from hitting the suspension device for suspending the rear wheel 110 of the vehicle 100 at the exhaust downstream end of the third pipe portion 42E, the second exhaust pipe 42 is inclined upwardly toward the rear of the vehicle. A third bent portion 42F is provided for bending. A fourth pipe portion 42G that extends obliquely upward toward the rear of the vehicle is provided at the exhaust downstream end of the third bent portion 42F. By providing the third bent part 42F and the fourth pipe part 42G in the second exhaust pipe 42, the second exhaust pipe 42 is provided at the exhaust downstream end of the third pipe part 42E and faces the rear of the vehicle. An inclined pipe portion K extending obliquely upward is formed.

第４管部４２Ｇの排気下流端には、車両後方に向かって斜め上方に延びる第２排気管４２を、車両後方に向かって斜め下方に曲げるための第４屈曲部４２Ｈが設けられており、この第４屈曲部４２Ｈの排気下流端には、車両後方に向かって斜め下方に延びる第５管部４２Ｋが設けられている。   A fourth bent portion 42H is provided at the exhaust downstream end of the fourth pipe portion 42G to bend the second exhaust pipe 42 extending obliquely upward toward the rear of the vehicle obliquely downward toward the rear of the vehicle. A fifth pipe portion 42K that extends obliquely downward toward the rear of the vehicle is provided at the exhaust downstream end of the fourth bent portion 42H.

第５管部４２Ｋの排気下流端には、車両後方に向かって斜め下方に延びる第２排気管４２を消音器６０に向けて曲げるための第５屈曲部４２Ｌが設けられている。この第５屈曲部４２Ｌの排気下流端には、消音器６０に接続される直線状の第６管部４２Ｍが設けられている。この第６管部４２Ｍの排気下流端は、消音器６０内に開口されている。   A fifth bent portion 42L for bending the second exhaust pipe 42 extending obliquely downward toward the rear of the vehicle toward the silencer 60 is provided at the exhaust downstream end of the fifth pipe portion 42K. A straight sixth pipe portion 42M connected to the silencer 60 is provided at the exhaust downstream end of the fifth bent portion 42L. The exhaust downstream end of the sixth pipe portion 42M is opened in the silencer 60.

図３及び図４に示すように、第３管部４２Ｅの車両下方における壁面には、第３管部４２Ｅの内側に向かって突出する円錐状の突起７０が設けられている。より詳細には、突起７０は、第３管部４２Ｅにおいて傾斜管部Ｋに近い位置に設けられており、第３管部４２Ｅの鉛直方向における最下点の壁面を管内に向けて凹ますことにより形成されている。   As shown in FIGS. 3 and 4, a conical protrusion 70 protruding toward the inside of the third pipe portion 42 </ b> E is provided on the wall surface of the third pipe portion 42 </ b> E below the vehicle. More specifically, the protrusion 70 is provided at a position close to the inclined pipe portion K in the third pipe portion 42E, and the wall of the lowest point in the vertical direction of the third pipe portion 42E is recessed toward the inside of the pipe. It is formed by.

図４に示すように、第３管部４２Ｅの内壁からの突起７０の突出量は、想定される最大量の凝縮水が第３管部４２Ｅの管内に溜まったとしても、突起７０の先端が凝縮水の水面ＷＳから出るように設定されている。   As shown in FIG. 4, the protrusion amount of the protrusion 70 from the inner wall of the third pipe portion 42E is such that even if a maximum amount of condensate is accumulated in the tube of the third pipe portion 42E, the tip of the protrusion 70 is It sets so that it may come out of the water surface WS of condensed water.

次に、本実施形態の第２排気管４２の作用を説明する。
まず、内燃機関１０から排出された排気が排熱回収器５０を通過すると、その通過中には排気から冷却水への熱移動が起きるために排気は冷却される。 Next, the operation of the second exhaust pipe 42 of the present embodiment will be described.
First, when the exhaust discharged from the internal combustion engine 10 passes through the exhaust heat recovery device 50, heat transfer from the exhaust to the cooling water occurs during the passage, so that the exhaust is cooled.

このようにして排気が冷やされると、排気中の水蒸気が液化して凝縮水が発生し、その凝縮水は第２排気管４２内の下部に溜まるようになる。
図５に示すように、第２排気管４２内に溜まった凝縮水Ｗは、排気の流勢によって第２排気管４２内を排気下流方向に移動していき、第３管部４２Ｅの突起７０に到達すると、凝縮水Ｗは突起７０によって跳ね上げられる。そして、跳ね上げられた凝縮水Ｗの先端が突起７０の壁面から剥離する。ここで、突起７０は第２排気管４２において絞り部となるため、排気が突起７０を通過する際には排気の流速が高められる。 When the exhaust gas is cooled in this way, the water vapor in the exhaust gas is liquefied and condensed water is generated, and the condensed water is accumulated in the lower part of the second exhaust pipe 42.
As shown in FIG. 5, the condensed water W accumulated in the second exhaust pipe 42 moves in the second exhaust pipe 42 in the exhaust downstream direction by the flow of the exhaust, and the protrusion 70 of the third pipe portion 42E. The condensed water W is splashed up by the protrusions 70. Then, the tip of the condensed water W bounced off is peeled off from the wall surface of the protrusion 70. Here, since the projection 70 becomes a throttle portion in the second exhaust pipe 42, the flow rate of the exhaust is increased when the exhaust passes through the projection 70.

図６に示すように、上記剥離した凝縮水ＷＨ（以下、突起７０から剥離した凝縮水を凝縮水ＷＨと記載する）は、流速の高められた排気によって加速されながら排気と共に排気下流側に送られ、これにより凝縮水ＷＨは傾斜管部Ｋを超えて排気下流側に流されやすくなる。そして、傾斜管部Ｋを超えて排気下流側に流された凝縮水ＷＨは、その後、第６管部４２Ｍの排気下流端から消音器６０内に排出される。こうして第２排気管４２内の凝縮水が消音器６０内に排出されることにより、例えば、第２排気管４２内における排気の通路断面積が凝縮水の凍結によって減少したり、第２排気管４２内が凝縮水の凍結によって閉塞したりするといった不都合の発生が抑えられる。   As shown in FIG. 6, the separated condensed water WH (hereinafter, condensed water separated from the projection 70 is referred to as condensed water WH) is accelerated by the exhaust having an increased flow rate and sent to the exhaust downstream side together with the exhaust. Thus, the condensed water WH easily flows over the inclined pipe portion K to the exhaust downstream side. The condensed water WH that has flowed to the exhaust downstream side beyond the inclined pipe portion K is then discharged into the silencer 60 from the exhaust downstream end of the sixth pipe portion 42M. Thus, the condensed water in the second exhaust pipe 42 is discharged into the silencer 60, so that, for example, the passage cross-sectional area of the exhaust in the second exhaust pipe 42 is reduced by freezing of the condensed water, or the second exhaust pipe Occurrence of an inconvenience that the inside of 42 is blocked by freezing of condensed water is suppressed.

また、上述したように、突起７０は第２排気管４２において絞り部となっており、その絞り部では排気の通路断面積が小さくなっている。そのため、そうした絞り部は排気の音エネルギーが管内を通る際の抵抗になり、その結果、排気音が低下するようになる。   Further, as described above, the protrusion 70 is a throttle portion in the second exhaust pipe 42, and the exhaust passage cross-sectional area is small in the throttle portion. Therefore, such a throttle portion becomes a resistance when the sound energy of the exhaust passes through the pipe, and as a result, the exhaust sound is lowered.

ちなみに、上記第１管部４２Ａに上記突起７０を設けると、第１管部４２Ａの排気下流端に設けられた第１屈曲部４２Ｂを排気が通過する際に排気の流勢が弱まるため、突起７０を通過する際に加速された凝縮水が排気とともに流れていく勢いも弱まってしまう。そのため、突起７０で凝縮水を壁面から剥離させても、その剥離した凝縮水は傾斜管部Ｋに到達する前に第２排気管４２の内壁に付着してしまうおそれがある。同様に、上記第２管部４２Ｃに上記突起７０を設けると、第２管部４２Ｃの排気下流端に設けられた第２屈曲部４２Ｄを排気が通過する際に排気の流勢が弱まるため、突起７０を通過する際に加速された凝縮水が排気とともに流れていく勢いも弱まってしまう。そのため、この場合にも、突起７０で凝縮水を壁面から剥離させても、その剥離した凝縮水は傾斜管部Ｋに到達する前に第２排気管４２の内壁に付着してしまうおそれがある。   Incidentally, when the projection 70 is provided on the first pipe portion 42A, the exhaust flow is weakened when the exhaust passes through the first bent portion 42B provided at the exhaust downstream end of the first pipe portion 42A. The momentum when the condensed water accelerated when passing through 70 flows with the exhaust gas is weakened. Therefore, even if the condensed water is peeled off from the wall surface by the protrusion 70, the peeled condensed water may adhere to the inner wall of the second exhaust pipe 42 before reaching the inclined pipe portion K. Similarly, when the projection 70 is provided on the second pipe portion 42C, the exhaust flow is weakened when the exhaust passes through the second bent portion 42D provided at the exhaust downstream end of the second pipe portion 42C. The momentum of the condensed water that is accelerated when passing through the protrusion 70 flows with the exhaust gas is also weakened. Therefore, in this case as well, even if the condensed water is separated from the wall surface by the protrusion 70, the separated condensed water may adhere to the inner wall of the second exhaust pipe 42 before reaching the inclined pipe portion K. .

この点、上記実施形態では、上述した第３管部４２Ｅに突起７０を設けるようにしており、突起７０と傾斜管部Ｋとの間の排気管は直線状になっているため、そうした直線状になっている排気管内を排気が流れる際には排気の流勢が落ちにくい。従って、突起７０を通過する際に加速された凝縮水ＷＨは、排気とともに流れていく勢いを維持したまま傾斜管部Ｋに到達するようになり、凝縮水ＷＨは傾斜管部Ｋを超えて排気下流側に流されやすくなる。   In this regard, in the above embodiment, the projection 70 is provided on the above-described third pipe portion 42E, and the exhaust pipe between the projection 70 and the inclined pipe portion K is linear. When the exhaust gas flows through the exhaust pipe, the flow of the exhaust gas is unlikely to drop. Accordingly, the condensed water WH accelerated when passing through the projection 70 reaches the inclined pipe portion K while maintaining the momentum flowing along with the exhaust, and the condensed water WH passes through the inclined pipe portion K and is exhausted. It becomes easy to flow downstream.

また、突起７０は、第３管部４２Ｅにおいて傾斜管部Ｋに近い位置に設けられている。そのため、第３管部４２Ｅにおいて傾斜管部Ｋから遠い位置、つまり第３管部４２Ｅにおいてより排気上流側の位置に突起７０を設ける場合と比較して、傾斜管部Ｋに達したときの凝縮水ＷＨの勢いはより強い状態を維持している。そのため、こうした理由によっても、凝縮水ＷＨは傾斜管部Ｋを超えて排気下流側に流されやすくなる。   Further, the protrusion 70 is provided at a position close to the inclined tube portion K in the third tube portion 42E. Therefore, compared with the case where the projection 70 is provided at a position farther from the inclined pipe part K in the third pipe part 42E, that is, at a position upstream of the exhaust gas in the third pipe part 42E, the condensation when the inclined pipe part K is reached. The momentum of the water WH remains stronger. For this reason, the condensed water WH easily flows over the inclined pipe portion K to the exhaust downstream side for these reasons.

以上、説明した本実施形態によれば、以下の効果を得ることができる。
（１）第３管部４２Ｅに突起７０を設けることにより、凝縮水ＷＨが傾斜管部Ｋを超えて排気下流側に流されやすくなるため、第２排気管４２内に溜まる凝縮水の排水性が向上するようになる。 As described above, according to the present embodiment described above, the following effects can be obtained.
(1) Since the condensate WH easily flows to the exhaust downstream side beyond the inclined pipe portion K by providing the projection 70 on the third pipe portion 42E, the drainage of the condensate collected in the second exhaust pipe 42 Will be improved.

（２）また、突起７０を設けることにより排気音が低下するようになるため、排気の消音性能が向上するようになる。
なお、上記実施形態は、以下のように変更して実施することもできる。 (2) Since the exhaust noise is lowered by providing the projection 70, the noise reduction performance of the exhaust is improved.
In addition, the said embodiment can also be changed and implemented as follows.

・突起７０の形状は円錐状であったが、その他の形状、例えば角錐状などでもよい。
・突起７０は、第３管部４２Ｅの壁面を管内に向けて凹ますことにより形成されていたが、その他の態様で第３管部４２Ｅに突起７０を設けてもよい。例えば、第３管部４２Ｅの内壁に、別途形成された突起７０を固定するようにしてもよい。 -Although the shape of the protrusion 70 was conical, other shapes such as a pyramid may be used.
The protrusion 70 is formed by denting the wall surface of the third tube portion 42E toward the inside of the tube, but the protrusion 70 may be provided on the third tube portion 42E in other modes. For example, a separately formed protrusion 70 may be fixed to the inner wall of the third pipe portion 42E.

・先の図３や図４に示したように、突起７０は、第３管部４２Ｅの鉛直方向における最下点の壁面を管内に向けて凹ますことにより形成していた。そして、第３管部４２Ｅの内壁からの突起７０の突出量は、想定される最大量の凝縮水が第３管部４２Ｅの管内に溜まったとしても、突起７０の先端が凝縮水の水面ＷＳから出るように設定した。   As shown in FIGS. 3 and 4, the protrusion 70 is formed by denting the wall surface of the lowest point in the vertical direction of the third pipe portion 42E toward the inside of the pipe. The protrusion 70 protrudes from the inner wall of the third pipe portion 42E. Even if the maximum amount of condensate is accumulated in the pipe of the third pipe portion 42E, the tip of the protrusion 70 is the water surface WS of the condensed water. Set to leave.

ここで、第３管部４２Ｅの管内に溜まる凝縮水の想定量が非常に多い場合には、それに合わせて突起７０の突出量も大きくしなければならないため、第３管部４２Ｅにおいて突起７０が大きな排気抵抗になってしまうおそれがある。   Here, when the estimated amount of condensed water accumulated in the pipe of the third pipe portion 42E is very large, the protrusion amount of the protrusion 70 must be increased accordingly, and therefore the protrusion 70 is formed in the third pipe portion 42E. There is a risk of large exhaust resistance.

そこで、図７に示すように、第３管部４２Ｅの鉛直方向における最下点Ｌではなく、その最下点Ｌよりも車両上方の壁面を管内に向けて凹ますことにより突起７０を形成するようにしてもよい。この場合には、上記実施形態と比較して、突起７０の形成部位が車両上方に移動することにより突起７０の壁面が凝縮水の水面ＷＳから出やすくなる。従って、突起７０の突出量をそれほど大きくしなくても、凝縮水の水面ＷＳから突起７０を出しやすくなる。そのため、第３管部４２Ｅにおいて突起７０が大きな排気抵抗になることを抑えながらも、凝縮水の排水性を向上させることができる。   Therefore, as shown in FIG. 7, not the lowest point L in the vertical direction of the third pipe portion 42E but the wall surface above the vehicle from the lowest point L is recessed toward the inside of the pipe to form the projection 70. You may do it. In this case, as compared with the above-described embodiment, the wall of the protrusion 70 is likely to come out from the water surface WS of the condensed water by moving the formation portion of the protrusion 70 upward in the vehicle. Therefore, even if the protrusion amount of the protrusion 70 is not increased so much, the protrusion 70 can be easily projected from the water surface WS of the condensed water. Therefore, it is possible to improve the drainage of condensed water while suppressing the protrusion 70 from becoming a large exhaust resistance in the third pipe portion 42E.

・上記実施形態の排気系には、第２排気管４２の排気上流端に排熱回収器５０が接続されていた。この他、排熱回収器５０に代えて、上記消音器６０とは異なる別の消音器が第２排気管４２の排気上流端に接続されている排気系においても、外気温が低いときには、外気との接触面積が比較的大きい消音器の内部を排気が通過する際に排気が冷却される。そのため、排気中の水蒸気が液化して凝縮水が発生し、その凝縮水は第２排気管４２内の下部に溜まるようになる。そこで、第２排気管４２の排気上流端に消音器が接続されている排気系においても、上述したような突起７０を設けることにより、排気管内に溜まる凝縮水の排水性を向上させることができるようになる。   In the exhaust system of the above embodiment, the exhaust heat recovery device 50 is connected to the exhaust upstream end of the second exhaust pipe 42. In addition, in the exhaust system in which another silencer different from the silencer 60 is connected to the exhaust upstream end of the second exhaust pipe 42 instead of the exhaust heat recovery device 50, when the outside air temperature is low, the outside air When the exhaust passes through the silencer having a relatively large contact area with the exhaust, the exhaust is cooled. Therefore, the water vapor in the exhaust gas is liquefied and condensed water is generated, and the condensed water is accumulated in the lower part in the second exhaust pipe 42. Therefore, also in the exhaust system in which the silencer is connected to the exhaust upstream end of the second exhaust pipe 42, the drainage of the condensed water accumulated in the exhaust pipe can be improved by providing the projection 70 as described above. It becomes like this.

・また、第２排気管４２の排気上流端に排熱回収器５０や消音器といった排気の冷却を促す部材が接続されていない排気系でも、外気温度が低いときには第２排気管４２自体の温度が低くなるため、第２排気管４２によって排気が冷却される。そのため、この場合にも第２排気管４２内の下部に凝縮水が溜まりやすい。そこで、第２排気管４２の排気上流端に排気の冷却を促す部材が接続されていない排気系においても、上述したような突起７０を設けることにより、排気管内に溜まる凝縮水の排水性を向上させることができるようになる。   Even in an exhaust system in which a member for promoting exhaust cooling such as the exhaust heat recovery device 50 and the silencer is not connected to the exhaust upstream end of the second exhaust pipe 42, the temperature of the second exhaust pipe 42 itself is low when the outside air temperature is low. Therefore, the exhaust gas is cooled by the second exhaust pipe 42. Therefore, also in this case, the condensed water tends to accumulate in the lower part in the second exhaust pipe 42. Therefore, even in an exhaust system in which a member that promotes cooling of the exhaust is not connected to the exhaust upstream end of the second exhaust pipe 42, by providing the projection 70 as described above, the drainage of the condensed water accumulated in the exhaust pipe is improved. To be able to.

１０…内燃機関、２０…エキゾーストマニホールド、３０…触媒装置、４１…第１排気管、４２…第２排気管、４２Ａ…第１管部、４２Ｂ…第１屈曲部、４２Ｃ…第２管部、４２Ｄ…第２屈曲部、４２Ｅ…第３管部、４２Ｆ…第３屈曲部、４２Ｇ…第４管部、４２Ｈ…第４屈曲部、４２Ｋ…第５管部、４２Ｌ…第５屈曲部、４２Ｍ…第６管部、５０…排熱回収器、６０…消音器、７０…突起、１００…車両、１１０…後輪、Ｋ…傾斜管部、Ｗ…凝縮水、ＷＨ…凝縮水、ＷＳ…水面。   DESCRIPTION OF SYMBOLS 10 ... Internal combustion engine, 20 ... Exhaust manifold, 30 ... Catalyst apparatus, 41 ... 1st exhaust pipe, 42 ... 2nd exhaust pipe, 42A ... 1st pipe part, 42B ... 1st bending part, 42C ... 2nd pipe part, 42D ... 2nd bent part, 42E ... 3rd pipe part, 42F ... 3rd bent part, 42G ... 4th pipe part, 42H ... 4th bent part, 42K ... 5th pipe part, 42L ... 5th bent part, 42M ... 6th pipe part, 50 ... Waste heat recovery device, 60 ... Silencer, 70 ... Projection, 100 ... Vehicle, 110 ... Rear wheel, K ... Inclined pipe part, W ... Condensed water, WH ... Condensed water, WS ... Water surface .

Claims (1)

車両に取り付けられる機関用の排気管であって、
複数の直線状の管部と、
前記管部のうち、最も排気下流側に設けられている管部の排気下流端に設けられており車両後方に向かって斜め上方に延びる傾斜管部とを、排気の熱を利用して機関冷却水を昇温させる排熱回収器よりも排気下流側に有しており、
前記最も排気下流側に設けられている管部の車両下方における壁面には、同管部の内側に向かって突出する突起が設けられている
ことを特徴とする機関用の排気管。 An exhaust pipe for an engine attached to a vehicle,
A plurality of straight pipe sections;
Among the pipe parts, an inclined pipe part provided at the exhaust downstream end of the pipe part provided on the most downstream side of the exhaust gas and extending obliquely upward toward the rear of the vehicle is engine-cooled using the heat of the exhaust gas. It is located downstream of the exhaust heat recovery unit that raises the temperature of the water ,
An exhaust pipe for an engine, characterized in that a projection projecting toward the inside of the pipe portion is provided on a wall surface below the vehicle of the pipe portion provided on the most downstream side of the exhaust.
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