JP2007270712A - Silencer - Google Patents

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JP2007270712A
JP2007270712A JP2006096864A JP2006096864A JP2007270712A JP 2007270712 A JP2007270712 A JP 2007270712A JP 2006096864 A JP2006096864 A JP 2006096864A JP 2006096864 A JP2006096864 A JP 2006096864A JP 2007270712 A JP2007270712 A JP 2007270712A
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diameter portion
air chamber
inner tube
silencer
small diameter
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Kazutoshi Wakatsuki
一稔 若月
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Toyota Motor Corp
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Toyota Motor Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To prevent the condensed water of the water content contained in exhaust gases from remaining in an air chamber between the outer tube and the inner tube of a silencer. <P>SOLUTION: This silencer comprises the inner tube 1 and the outer tube 2 installed on the outer peripheral part of the inner tube 1 with the air chamber 3 interposed therebetween. A large diameter part 11, a reduced diameter part 12, and a small diameter part 13 are formed in the inner tube 1 in this order from the upstream side of an exhaust gas flow. A drain pipe 5 allowing the inside of the air chamber 3 to communicate with the inside of the small diameter part 13 is connected to the lower side of the small diameter part 13 of the inner tube 1. Since a pressure difference (pressure in the air chamber 3 > pressure in the small diameter part 13) occurs between the inside of the air chamber 3 and the inside of the small diameter part 13 of the inner tube 1, the flow of exhaust gases occurs in the drain pipe 5. The condensed water remaining in the air chamber 3 is sucked into the small diameter part 13 of the inner tube 1 through the drain pipe 5, and drained from the inner tube 1 to the outside of the silencer 100. Consequently, the condensed water can be prevented from remaining in the air chamber 3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、内燃機関の排気ガスの排気系に用いられる消音器に関する。   The present invention relates to a silencer used for an exhaust system of an exhaust gas of an internal combustion engine.

車両に搭載される内燃機関（以下、エンジンともいう）には、車両走行時の排気騒音を低減するため、排気系に消音装置が装着されている。   2. Description of the Related Art An internal combustion engine (hereinafter also referred to as an engine) mounted on a vehicle is equipped with a silencer in an exhaust system in order to reduce exhaust noise during vehicle travel.

エンジンの排気系としては、例えば、エンジンのエキゾーストマニホールドに接続される触媒コンバータ、サブマフラ、メインマフラなどの構成部材を備え、その構成部材を排気管及びフランジ等を用いて相互に連結する構造が採用されている。このような排気系に用いられるサブマフラとして、ストレートタイプの消音器がある。   As an engine exhaust system, for example, a structure that includes catalytic converters, sub-mufflers, main mufflers, etc. connected to the exhaust manifold of the engine, and a structure in which these components are connected to each other using exhaust pipes, flanges, etc. Has been. As a sub-muffler used in such an exhaust system, there is a straight type silencer.

ストレートタイプの消音器の一例を図５に示す。この例の消音器５００は、多数の小孔５０１ａ・・５０１ａが管壁に形成された内管５０１と、その内管５０１の孔形成部の外周部に空気室（共鳴室）５０３を形成するように配設された外筒５０２によって構成されており、内管５０１の小孔５０１ａ・・５０１ａと、外筒５０２と内管５０１との間の空気室５０３による共鳴により、高周波域の騒音を低減する消音器である。   An example of a straight type silencer is shown in FIG. The silencer 500 of this example forms an inner tube 501 in which a large number of small holes 501a... 501a are formed in the tube wall, and an air chamber (resonance chamber) 503 in the outer peripheral portion of the hole forming portion of the inner tube 501. The outer cylinder 502 is arranged in the manner described above, and the resonance of the small holes 501a... 501a of the inner pipe 501 and the air chamber 503 between the outer cylinder 502 and the inner pipe 501 generates high-frequency noise. It is a silencer to reduce.

このような消音器等を備えたエンジン排気系においては、エンジンからの排気ガス中に水分が含まれているため、排気管及び消音器が冷えている間に、排気ガス中の水分が凝縮して消音器内に凝縮水が残留して消音器が腐食する場合がある。   In an engine exhaust system equipped with such a silencer, etc., since moisture is contained in the exhaust gas from the engine, moisture in the exhaust gas is condensed while the exhaust pipe and the silencer are cooled. As a result, condensed water may remain in the silencer and the silencer may corrode.

ここで、消音器の内部への凝縮水の残留を防止する方法として、例えば下記の特許文献１がある。この特許文献１に記載の技術では、シェルの内部に排気ガスを導入するインレットパイプと、シェル内部から排気ガスを導出するアウトレットパイプとを備えた消音器において、アウトレットパイプの下流部の下面部に下方に延びる排水パイプを設けて、シェル内の凝縮水を排水している。
特開２００４−２８５９１６号公報 特開２００２−０７０５２６号公報 特開平０８−０８２２１０号公報 Here, as a method for preventing the condensate from remaining inside the silencer, for example, there is Patent Document 1 below. In the technique described in Patent Document 1, in a silencer including an inlet pipe for introducing exhaust gas into the shell and an outlet pipe for extracting exhaust gas from the inside of the shell, a lower surface portion of a downstream portion of the outlet pipe is provided. A drain pipe extending downward is provided to drain the condensed water in the shell.
JP 2004-285916 A Japanese Patent Laid-Open No. 2002-070526 Japanese Patent Application Laid-Open No. 08-082210

ところで、図５に示すストレートタイプの消音器５００においては、排気ガス中の水分が凝縮して外筒５０２と内管５０１との間の空気室５０３内に凝縮水が生成される。このような凝縮水は、エンジンが高回転で排気ガスのガス流速が大きいときには、そのガス流速にて消音器外部へと排水される。しかし、エンジンが低回転時で排気ガスのガス流速が小さいときには、凝縮水は消音器外部に排水されず、外筒５０２と内管５０１との間の空気室５０３内に残留する。このようにして空気室５０３内に凝縮水が残留すると、その凝縮水によって外筒５０２が腐食するという問題がある。さらに、共鳴室として機能する空気室５０３内に凝縮水が残留すると、空気室５０３の容量が変化するため、共鳴による消音性能が低下する。   By the way, in the straight type silencer 500 shown in FIG. 5, moisture in the exhaust gas is condensed and condensed water is generated in the air chamber 503 between the outer cylinder 502 and the inner pipe 501. Such condensed water is drained to the outside of the silencer at the gas flow rate when the engine speed is high and the gas flow rate of the exhaust gas is large. However, when the engine speed is low and the exhaust gas flow rate is low, the condensed water is not drained outside the silencer and remains in the air chamber 503 between the outer cylinder 502 and the inner pipe 501. When condensed water remains in the air chamber 503 in this way, there is a problem that the outer cylinder 502 is corroded by the condensed water. Furthermore, if condensed water remains in the air chamber 503 functioning as a resonance chamber, the capacity of the air chamber 503 changes, so that the noise reduction performance due to resonance decreases.

ここで、ストレートタイプの消音器において、外筒と内管との間の空気室内に残留した凝縮水を排水する方法として、内管の下部に排水管を設けるという方法が考えられるが、図５に示す構造では、外筒５０２と内管５０１との間の空気室５０３内と、内管５０１内との間に圧力差が発生しないため、単に排水管を設けるだけでは、空気室５０３内に残留した凝縮水を十分に排水することはできない。   Here, in the straight type silencer, as a method of draining the condensed water remaining in the air chamber between the outer cylinder and the inner pipe, a method of providing a drain pipe at the lower part of the inner pipe is conceivable. In the structure shown in the figure, there is no pressure difference between the air chamber 503 between the outer cylinder 502 and the inner tube 501 and the inner tube 501, so that it is simply left in the air chamber 503 simply by providing a drain pipe. It is not possible to drain the condensed water sufficiently.

本発明はそのような実情を考慮してなされたもので、内燃機関が低回転時で排気ガスのガス流速が小さい場合であっても、外筒と内管との間の空気室に凝縮水が残留することを防止することが可能な消音器の提供を目的とする。   The present invention has been made in view of such circumstances, and even when the internal combustion engine is running at a low speed and the gas flow rate of the exhaust gas is small, the condensed water is contained in the air chamber between the outer cylinder and the inner pipe. An object of the present invention is to provide a silencer capable of preventing the remaining of the sound.

上記目的を達成するため、本発明は、内燃機関の排気ガスの排気系に用いられる消音器であって、排気ガス流の上流側から順に、複数の孔が管壁に設けられた大径部、縮径部及び小径部が形成された内管と、前記内管の大径部、縮径部及び小径部の外周部に空気室を形成するように配設された外筒とを備えているとともに、前記内管の小径部の下側に、前記空気室内と当該小径部内とを連通する導管が設けられていることを特徴としている。   In order to achieve the above object, the present invention is a silencer used for an exhaust system of an exhaust gas of an internal combustion engine, and a large-diameter portion in which a plurality of holes are provided in a tube wall in order from the upstream side of the exhaust gas flow. An inner tube in which a reduced diameter portion and a small diameter portion are formed, and an outer cylinder disposed so as to form an air chamber in an outer peripheral portion of the large diameter portion, the reduced diameter portion, and the small diameter portion of the inner tube. In addition, a conduit that communicates the air chamber with the inside of the small-diameter portion is provided below the small-diameter portion of the inner pipe.

本発明の消音器によれば、内管の大径部に設けた複数の小孔と、外筒と内管との間の空気室による共鳴により、排気系に流れる排気ガスの高周波域の騒音を低減することができる。しかも、内管の排気ガス流の下流側に小径部を設け、その小径部の下側に、外筒と内管との間の空気室内と当該小径部内とを連通する導管（排水管）を設けているので、排気ガス中に含まれる水分の凝縮により生成される凝縮水が空気室内に残留することを防止することができる。この点について以下に説明する。   According to the silencer of the present invention, the noise in the high frequency region of the exhaust gas flowing in the exhaust system due to resonance by the plurality of small holes provided in the large diameter portion of the inner tube and the air chamber between the outer tube and the inner tube. Can be reduced. In addition, a small-diameter portion is provided on the downstream side of the exhaust gas flow in the inner pipe, and a conduit (drainage pipe) that communicates the air chamber between the outer cylinder and the inner pipe and the inside of the small-diameter portion is provided below the small-diameter portion. Since it is provided, it is possible to prevent the condensed water generated by the condensation of moisture contained in the exhaust gas from remaining in the air chamber. This will be described below.

まず、本発明の消音器において、排気ガスが内管に流れると、内管の縮径部が抵抗となって縮径部の上流側の大径部内の圧力が上昇するとともに、大径部の複数の小孔を通じて空気室内に流入して空気室内の圧力も上昇する。一方、内管を流れる排気ガスの流れは、縮径部を通過した後に小径部において流速が増加するので、内管の小径部内の圧力が低下する。   First, in the silencer of the present invention, when the exhaust gas flows into the inner tube, the reduced diameter portion of the inner tube becomes a resistance and the pressure in the large diameter portion upstream of the reduced diameter portion increases, and the large diameter portion The air flows into the air chamber through a plurality of small holes, and the pressure in the air chamber also rises. On the other hand, since the flow rate of the exhaust gas flowing through the inner pipe increases in the small diameter portion after passing through the reduced diameter portion, the pressure in the small diameter portion of the inner pipe decreases.

このような空気室内の圧力上昇と、内管の小径部内の圧力低下により、空気室内と内管の小径部内との間に圧力差（空気室内＞小径部内）が発生して、導管の内部に排気ガスの流れ（空気室内から小径部内に向かう流れ）が生じる。このようにして導管内に排気ガスの流れが生じると、外筒と内管との間の空気室内に残留した凝縮水が導管を通じて内管の小径部内に吸い上げられ、その内管の小径部から消音器外部へと排水されるので、空気室内に凝縮水が残留しなくなる。しかも、エンジンが低回転時で排気ガスの流速が小さい場合であっても、排気ガスの流れによって、上記した空気室内の圧力上昇及び内管の小径部内の圧力低下が生じて、空気室内と内管の小径部内との間に圧力差（空気室内＞小径部内）が発生するので、空気室内に凝縮水が残留することを防止することができる。   Due to the pressure increase in the air chamber and the pressure drop in the small diameter portion of the inner pipe, a pressure difference (air chamber> inside the small diameter portion) is generated between the air chamber and the small diameter portion of the inner pipe, An exhaust gas flow (a flow from the air chamber toward the small diameter portion) occurs. When exhaust gas flows in the conduit in this way, condensed water remaining in the air chamber between the outer cylinder and the inner tube is sucked into the small diameter portion of the inner tube through the conduit, and from the small diameter portion of the inner tube. Since it is drained to the outside of the silencer, condensed water does not remain in the air chamber. Moreover, even when the engine is running at a low speed and the exhaust gas flow rate is low, the flow of the exhaust gas causes the pressure increase in the air chamber and the pressure decrease in the small-diameter portion of the inner pipe, and the air chamber and the internal chamber Since a pressure difference (in the air chamber> inside the small diameter portion) occurs between the small diameter portion of the pipe, it is possible to prevent the condensed water from remaining in the air chamber.

本発明において、内管の大径部の下流部に、当該大径部内の圧力を高めるための圧損上昇部材（例えば、複数の貫通孔を有する圧損上昇プレート）を設けておいてもよい。このような構成を採用すると、内管の大径部の圧力をより一層高くすることができ、これによって空気室内と内管内との間に生じる圧力差が大きくなる結果、凝縮水の排水性が更に向上する。   In the present invention, a pressure loss increasing member (for example, a pressure loss increasing plate having a plurality of through holes) for increasing the pressure in the large diameter portion may be provided downstream of the large diameter portion of the inner pipe. By adopting such a configuration, it is possible to further increase the pressure of the large-diameter portion of the inner pipe, and as a result, the pressure difference generated between the air chamber and the inner pipe increases, resulting in the drainage of condensed water. Further improvement.

本発明の消音器によれば、外筒と内管との間の空気室内に凝縮水が残留することを抑制することが可能であるので、凝縮水による外筒の腐食を防止することができる。さらに、空気室内への凝縮水の残留がなくなることから、共鳴室として機能する空気室の容量が変化することがなくなり、常に適正な消音性能を確保することができる。   According to the silencer of the present invention, it is possible to prevent the condensed water from remaining in the air chamber between the outer cylinder and the inner pipe, and therefore corrosion of the outer cylinder due to the condensed water can be prevented. . Furthermore, since no condensate remains in the air chamber, the capacity of the air chamber functioning as the resonance chamber does not change, and an appropriate noise reduction performance can always be ensured.

以下、本発明の実施形態を図面に基づいて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図１は本発明の消音器を適用するエンジンの排気系の概略構成図である。   FIG. 1 is a schematic configuration diagram of an exhaust system of an engine to which the silencer of the present invention is applied.

エンジン２００にはエキゾーストマニホールド２０１が設けられており、このエキゾーストマニホールド２０１に排気系３００が接続されている。排気系３００には、排気ガス流の上流側から順に、触媒コンバータ３０１、サブマフラ１００及びメインマフラ３０２が配置されている。   The engine 200 is provided with an exhaust manifold 201, and an exhaust system 300 is connected to the exhaust manifold 201. In the exhaust system 300, a catalytic converter 301, a sub muffler 100, and a main muffler 302 are arranged in order from the upstream side of the exhaust gas flow.

触媒コンバータ３０１はエキゾーストマニホールド２０１に一対のフランジ３２１，３２１及び排気管（フロントパイプ）３１１を介して接続されている。触媒コンバータ３０１には、サブマフラ１００が一対のフランジ３２２，３２２を介して接続されている。さらに、サブマフラ１００にメインマフラ３０２が排気管（センターパイプ）３１２及び一対のフランジ３２３，３２３を介して接続されており、このメインマフラ３０２にテールパイプ３１３が接続されている。   The catalytic converter 301 is connected to the exhaust manifold 201 via a pair of flanges 321 and 321 and an exhaust pipe (front pipe) 311. The sub-muffler 100 is connected to the catalytic converter 301 via a pair of flanges 322 and 322. Further, a main muffler 302 is connected to the sub muffler 100 via an exhaust pipe (center pipe) 312 and a pair of flanges 323 and 323, and a tail pipe 313 is connected to the main muffler 302.

このような排気系３００の触媒コンバータ３０１により、エンジン２００からの排気ガスが浄化される。さらに、排気系３００に配置された触媒コンバータ３０１、サブマフラ１００及びメインマフラ３０２によって排気音が減衰される。   The exhaust gas from the engine 200 is purified by such a catalytic converter 301 of the exhaust system 300. Further, exhaust noise is attenuated by the catalytic converter 301, the sub muffler 100 and the main muffler 302 arranged in the exhaust system 300.

そして、この例では、排気系３００のサブマフラ１００に本発明の消音器を適用している点に特徴がある。以下、サブマフラ１００を消音器１００という。   This example is characterized in that the silencer of the present invention is applied to the sub-muffler 100 of the exhaust system 300. Hereinafter, the sub muffler 100 is referred to as a silencer 100.

次に、消音器１００について図２を参照しながら説明する。   Next, the silencer 100 will be described with reference to FIG.

この例に用いる消音器１００は金属製の内管１と外筒２とを備えている。内管１は、排気ガス流の上流側から順に、大径部１１、縮径部１２及び小径部１３が形成されている。内管１の大径部１１の管壁には、多数の小孔１１ａ・・１１ａが形成されている。   A silencer 100 used in this example includes a metal inner tube 1 and an outer tube 2. The inner pipe 1 is formed with a large diameter portion 11, a reduced diameter portion 12 and a small diameter portion 13 in order from the upstream side of the exhaust gas flow. A large number of small holes 11 a... 11 a are formed in the tube wall of the large diameter portion 11 of the inner tube 1.

外筒２は、内管１の大径部１１、縮径部１２及び小径部１３を覆うように設けられており、これら外筒２と内管１との間に空気室（共鳴室）３が形成されている。外筒２には、排気ガス流の上流側及び下流側がそれぞれテーパ形状に加工されており、その上流側端部２１は内管１の外周面に溶接等によって固着されている。また、外筒２の下流側端部２２は、内管１の外周面にワイヤメッシュリング４を介して支持されている。   The outer cylinder 2 is provided so as to cover the large diameter portion 11, the reduced diameter portion 12, and the small diameter portion 13 of the inner tube 1, and an air chamber (resonance chamber) 3 between the outer tube 2 and the inner tube 1. Is formed. The outer cylinder 2 is processed into a tapered shape on the upstream side and the downstream side of the exhaust gas flow, and the upstream end 21 thereof is fixed to the outer peripheral surface of the inner tube 1 by welding or the like. Further, the downstream end 22 of the outer cylinder 2 is supported on the outer peripheral surface of the inner tube 1 via the wire mesh ring 4.

そして、この例の消音器１００では、内管１の小径部１３の下側に、下方に延びる排水管（導管）５を設けている点に特徴がある。排水管５の上端は内管１の内部に連通している。排水管５の下端は、外筒２と内管１（小径部１３）との間の空気室３内に、外筒２の底面に対して所定の間隔をあけた状態で配置されており、この排水管５によって空気室３内と内管１の縮径部１３内とは相互に連通している。そして、排水管５は、消音器１００を車両に搭載されるエンジン２００の排気系３００に取り付けた状態で、略鉛直方向に沿うように配置される。   The silencer 100 of this example is characterized in that a drain pipe (conduit) 5 extending downward is provided below the small diameter portion 13 of the inner pipe 1. The upper end of the drain pipe 5 communicates with the inside of the inner pipe 1. The lower end of the drain pipe 5 is disposed in the air chamber 3 between the outer cylinder 2 and the inner pipe 1 (small diameter portion 13) with a predetermined distance from the bottom surface of the outer cylinder 2. By this drain pipe 5, the inside of the air chamber 3 and the inside of the reduced diameter portion 13 of the inner pipe 1 communicate with each other. And the drain pipe 5 is arrange | positioned so that the silencer 100 may be attached to the exhaust system 300 of the engine 200 mounted in a vehicle along a substantially vertical direction.

以上の構造の消音器１００によれば、内管１の大径部１１の管壁に小孔１１ａ・・１１ａを設けるとともに、その大径部１１の外周部に空気室３を設けているので、内管１の小孔１１ａ・・１１ａと、外筒２と内管１との間の空気室３による共鳴により、高周波域の騒音を低減することができる。   According to the silencer 100 having the above structure, the small holes 11a... 11a are provided in the tube wall of the large-diameter portion 11 of the inner tube 1, and the air chamber 3 is provided in the outer peripheral portion of the large-diameter portion 11. The resonance of the small holes 11a... 11a of the inner tube 1 and the air chamber 3 between the outer tube 2 and the inner tube 1 can reduce noise in a high frequency range.

ところで、上述したように、エンジン２００からの排気ガス中には水分が含まれているため、排気管３１２及び消音器１００などが冷えている間に、排気ガス中の水分が凝縮して、消音器１００内に凝縮水が生成される。このような凝縮水は、エンジン２００が高回転で排気ガスのガス流速が大きいときには、そのガス流速にて消音器１００の外部へと排水される。一方、エンジン２００が低回転時で排気ガスのガス流速が小さいときには、凝縮水は消音器１００の外部に排水されず、外筒２と内管１との間の空気室３内に残留するという問題が発生する。このような問題を解消するため、この例の消音器１００では、内管１に縮径部１２を介して小径部１３を設けるとともに、その小径部１３の下側に排水管５を配設することで、空気室３内への凝縮水の残留を抑制している。この点について以下に説明する。   By the way, as described above, since the exhaust gas from the engine 200 contains moisture, the moisture in the exhaust gas is condensed while the exhaust pipe 312 and the silencer 100 are cooled, so that the sound is silenced. Condensed water is generated in the vessel 100. Such condensed water is drained to the outside of the silencer 100 at the gas flow rate when the engine 200 is at a high speed and the gas flow rate of the exhaust gas is large. On the other hand, when the engine 200 is running at a low speed and the gas flow rate of the exhaust gas is small, the condensed water is not drained outside the silencer 100 and remains in the air chamber 3 between the outer cylinder 2 and the inner pipe 1. A problem occurs. In order to solve such a problem, in the silencer 100 of this example, the inner pipe 1 is provided with the small diameter portion 13 via the reduced diameter portion 12 and the drain pipe 5 is disposed below the small diameter portion 13. Thus, the remaining condensed water in the air chamber 3 is suppressed. This will be described below.

まず、図２に示す消音器１００において、排気ガスが内管１内に流入すると、縮径部１２が抵抗となって、内管１の縮径部１２の上流側の大径部１１内の圧力が上昇するとともに、大径部１１の小孔１１ａ・・１１ａを通じて排気ガスが空気室３内に流入して空気室３内の圧力も上昇する。一方、内管１を流れる排気ガスの流れは、縮径部１２を通過した後に小径部１３において流速が増加するので、内管１の小径部１３内の圧力が低下する。   First, in the silencer 100 shown in FIG. 2, when exhaust gas flows into the inner tube 1, the reduced diameter portion 12 becomes a resistance, and the inside of the large diameter portion 11 upstream of the reduced diameter portion 12 of the inner tube 1. As the pressure rises, exhaust gas flows into the air chamber 3 through the small holes 11a... 11a of the large diameter portion 11, and the pressure in the air chamber 3 also rises. On the other hand, since the flow rate of the exhaust gas flowing through the inner pipe 1 increases in the small diameter part 13 after passing through the reduced diameter part 12, the pressure in the small diameter part 13 of the inner pipe 1 decreases.

このような空気室３内の圧力上昇と、内管１の小径部１３内の圧力低下により、空気室３内と内管１の小径部１３内との間に圧力差（空気室３内＞小径部１３内）が発生して排水管５内に排気ガスの流れ（空気室３内から小径部１３内に向かう流れ）が生じる。このようにして排水管５内に排気ガスの流れが生じると、図３に示すように、空気室３内の凝縮水が排水管５を通じて内管１の小径部１３内に吸い上げられて、その内管１の小径部１３から消音器１００の外部へと排水されるので、空気室３内に凝縮水が残留しなくなる。しかも、エンジン２００が低回転時で排気ガスの流速が小さい場合であっても、排気ガス流によって、上記した空気室３内の圧力上昇と、内管１の小径部１３内の圧力低下が生じて、空気室３内と内管１の小径部１３内との間に圧力差（空気室３内＞小径部１３内）が発生するので、空気室３内に凝縮水が残留することを防止することができる。   Due to such a pressure increase in the air chamber 3 and a pressure drop in the small diameter portion 13 of the inner tube 1, a pressure difference (in the air chamber 3> between the air chamber 3 and the small diameter portion 13 of the inner tube 1> In the small-diameter portion 13) is generated, and an exhaust gas flow (flow from the air chamber 3 into the small-diameter portion 13) is generated in the drain pipe 5. When the flow of the exhaust gas is generated in the drain pipe 5 in this way, the condensed water in the air chamber 3 is sucked into the small diameter portion 13 of the inner pipe 1 through the drain pipe 5 as shown in FIG. Since the water is discharged from the small diameter portion 13 of the inner pipe 1 to the outside of the silencer 100, condensed water does not remain in the air chamber 3. Moreover, even when the engine 200 is running at a low speed and the exhaust gas flow rate is small, the exhaust gas flow causes the pressure increase in the air chamber 3 and the pressure decrease in the small diameter portion 13 of the inner pipe 1. As a result, a pressure difference (in the air chamber 3> inside the small diameter portion 13) is generated between the air chamber 3 and the small diameter portion 13 of the inner tube 1, so that the condensed water is prevented from remaining in the air chamber 3. can do.

以上のように、この例の消音器１００では、空気室３内（外筒２の底部）に凝縮水が残留することを防止することができるので、外筒２の腐食を防ぐことができる。さらに、空気室３内への凝縮水の残留がなくなることから、共鳴室として機能する空気室３の容量が変化することがなくなり、常に適正な消音性能を確保することができる。   As described above, in the silencer 100 of this example, it is possible to prevent the condensed water from remaining in the air chamber 3 (the bottom portion of the outer cylinder 2), and thus corrosion of the outer cylinder 2 can be prevented. Furthermore, since no condensate remains in the air chamber 3, the capacity of the air chamber 3 functioning as a resonance chamber does not change, and an appropriate noise reduction performance can always be ensured.

−他の実施形態−
以上の図２の構成に加えて、図４に示すように、大径部１１の排気ガス流の下流部（小孔１１ａの形成部の下流側）に、多数の貫通孔６ａ・・６ａを有する圧損上昇プレート６を設けておいてもよい。このような圧損上昇プレータ６を設けておくと、内管１の大径部１１の圧力をより一層高くすることができ、これによって空気室３内と内管１の小径部１３内との間に生じる圧力差が大きくなる結果、凝縮水の排水性が更に向上する。 -Other embodiments-
In addition to the configuration shown in FIG. 2, as shown in FIG. 4, a large number of through holes 6 a, 6 a are provided in the downstream portion of the exhaust gas flow in the large diameter portion 11 (downstream of the portion where the small holes 11 a are formed). You may provide the pressure loss raising plate 6 which has. Providing such a pressure loss raising plater 6 makes it possible to further increase the pressure of the large-diameter portion 11 of the inner tube 1, and thereby, between the air chamber 3 and the small-diameter portion 13 of the inner tube 1. As a result of the increased pressure difference in the water, the drainage of condensed water is further improved.

以上の例では、エンジン排気系のメインマフラの上流側に配設されるサブマフラに、本発明の消音器を適用した例を示したが、これに限られることなく、サブマフラがメインマフラの下流側に配設される場合には、その下流側のサブマフラに本発明の消音器を適用してもよい。また、複数のサブマフラがメインマフラの上流側と下流側に配設される場合であっても、それら上流側と下流側の各サブマフラに本発明の消音器を適用してもよい。   In the above example, the muffler of the present invention is applied to the sub muffler disposed on the upstream side of the main muffler of the engine exhaust system, but the sub muffler is not limited to this, and the sub muffler is located downstream of the main muffler. The silencer of the present invention may be applied to the downstream sub-muffler. Further, the silencer of the present invention may be applied to each of the upstream and downstream sub-mufflers even when a plurality of sub-mufflers are disposed on the upstream and downstream sides of the main muffler.

以上の例では、エンジン排気系においてメインマフラと対に配設されるサブマフラに本発明を適用した例を示したが、これに限られることなく、エンジン排気系に１つのストレートタイプのマフラが配設される場合には、そのストレートタイプのマフラに本発明の消音器を適用してもよい。   In the above example, the example in which the present invention is applied to the sub muffler disposed in a pair with the main muffler in the engine exhaust system has been described. However, the present invention is not limited to this, and one straight type muffler is disposed in the engine exhaust system. In this case, the silencer of the present invention may be applied to the straight type muffler.

本発明の消音器を適用するエンジンの排気系の概略構成図である。It is a schematic block diagram of the exhaust system of the engine which applies the silencer of this invention. 本発明の消音器の一例を示す縦断面図である。It is a longitudinal section showing an example of a silencer of the present invention. 図２の消音器の作用説明図である。It is operation | movement explanatory drawing of the silencer of FIG. 本発明の消音器の他の例を示す縦断面図である。It is a longitudinal cross-sectional view which shows the other example of the silencer of this invention. 従来のストレートタイプの消音器の一例を示す縦断面図である。It is a longitudinal cross-sectional view which shows an example of the conventional straight type silencer.

符号の説明Explanation of symbols

１００ 消音器（サブマフラ）
１ 内管
１１ 大径部
１１ａ 小孔
１２ 縮径部
１３ 小径部
２ 外筒
３ 空気室（共鳴室）
４ ワイヤメッシュリング
５ 排水管（導管）
２００ エンジン
３００ 排気系
３０１ 触媒コンバータ
３０２ メインマフラ 100 Muffler (sub muffler)
DESCRIPTION OF SYMBOLS 1 Inner pipe 11 Large diameter part 11a Small hole 12 Reduced diameter part 13 Small diameter part 2 Outer cylinder 3 Air chamber (resonance chamber)
4 Wire mesh ring 5 Drain pipe (conduit)
200 Engine 300 Exhaust system 301 Catalytic converter 302 Main muffler

Claims (2)

内燃機関の排気ガスの排気系に用いられる消音器であって、排気ガス流の上流側から順に、複数の孔が管壁に設けられた大径部、縮径部及び小径部が形成された内管と、前記内管の大径部、縮径部及び小径部の外周部に空気室を形成するように配設された外筒とを備えているとともに、前記内管の小径部の下側に、前記空気室内と当該小径部内とを連通する導管が設けられていることを特徴とする消音器。   A muffler used for an exhaust gas exhaust system of an internal combustion engine, in which a large-diameter portion, a reduced-diameter portion, and a small-diameter portion having a plurality of holes provided in a tube wall are formed in order from the upstream side of the exhaust gas flow. An inner tube, and an outer cylinder disposed so as to form an air chamber in the outer periphery of the large-diameter portion, the reduced-diameter portion, and the small-diameter portion of the inner tube, and below the small-diameter portion of the inner tube A silencer characterized in that a conduit is provided on the side to communicate the air chamber and the inside of the small diameter portion. 前記内管の大径部の下流部に、当該大径部内の圧力を高めるための圧損上昇部材が設けられていることを特徴とする請求項１記載の消音器。   The silencer according to claim 1, wherein a pressure loss increasing member for increasing the pressure in the large diameter portion is provided in a downstream portion of the large diameter portion of the inner pipe.
JP2006096864A 2006-03-31 2006-03-31 Silencer Pending JP2007270712A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009138730A (en) * 2007-12-07 2009-06-25 Hyundai Motor Co Ltd Noise eliminator for vehicle, and exhaust device using the same
JP2011146351A (en) * 2010-01-18 2011-07-28 Toyota Industries Corp Fuel-cell system
JP2011169160A (en) * 2010-02-16 2011-09-01 Honda Motor Co Ltd Sub assembly of engine exhaust device
CN105547678A (en) * 2016-01-07 2016-05-04 江苏大学 Silencer overpressure resistance test apparatus
JP2018071521A (en) * 2016-11-04 2018-05-10 トヨタ自動車株式会社 Exhaust pipe structure
JP2018115576A (en) * 2017-01-17 2018-07-26 フタバ産業株式会社 Muffler

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JPS5759612Y2 (en) * 1978-02-21 1982-12-20
JPS6073823U (en) * 1983-10-27 1985-05-24 カルソニックカンセイ株式会社 Silencer
JP2005320950A (en) * 2004-05-04 2005-11-17 Takeshi Oshima Automobile muffler automatically draining corrosive stagnated water

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5759612Y2 (en) * 1978-02-21 1982-12-20
JPS6073823U (en) * 1983-10-27 1985-05-24 カルソニックカンセイ株式会社 Silencer
JP2005320950A (en) * 2004-05-04 2005-11-17 Takeshi Oshima Automobile muffler automatically draining corrosive stagnated water

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009138730A (en) * 2007-12-07 2009-06-25 Hyundai Motor Co Ltd Noise eliminator for vehicle, and exhaust device using the same
JP2011146351A (en) * 2010-01-18 2011-07-28 Toyota Industries Corp Fuel-cell system
JP2011169160A (en) * 2010-02-16 2011-09-01 Honda Motor Co Ltd Sub assembly of engine exhaust device
CN105547678A (en) * 2016-01-07 2016-05-04 江苏大学 Silencer overpressure resistance test apparatus
JP2018071521A (en) * 2016-11-04 2018-05-10 トヨタ自動車株式会社 Exhaust pipe structure
CN108019268A (en) * 2016-11-04 2018-05-11 丰田自动车株式会社 The exhaust pipe structure of vehicle
CN108019268B (en) * 2016-11-04 2020-11-17 丰田自动车株式会社 Exhaust pipe structure of vehicle
US10865930B2 (en) 2016-11-04 2020-12-15 Toyota Jidosha Kabushiki Kaisha Vehicular exhaust pipe structure
JP2018115576A (en) * 2017-01-17 2018-07-26 フタバ産業株式会社 Muffler

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