JP2007002707A - Internal combustion engine - Google Patents

Internal combustion engine Download PDF

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JP2007002707A
JP2007002707A JP2005182704A JP2005182704A JP2007002707A JP 2007002707 A JP2007002707 A JP 2007002707A JP 2005182704 A JP2005182704 A JP 2005182704A JP 2005182704 A JP2005182704 A JP 2005182704A JP 2007002707 A JP2007002707 A JP 2007002707A
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exhaust
combustion engine
internal combustion
diameter
branch pipe
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JP4558592B2 (en
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Masatoshi Haneda
雅敏 羽田
Susumu Nomura
晋 野村
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Aichi Machine Industry Co Ltd
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Aichi Machine Industry Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an internal combustion engine, capable of improving exhaust gas purifying effect by sufficiently putting exhaust gas in contact with an exhaust sensor, and improving flow of exhaust gas without increasing the number of components. <P>SOLUTION: This internal combustion engine is provided with an exhaust manifold 1, and an exhaust emission control device 2 disposed just downstream of the exhaust manifold 1. The exhaust manifold 1 is provided with an enlarged chamber 6a provided with the exhaust sensor 7 on the top, and having an inner space gradually enlarged from the top toward a lower part where it is directly coupled with the exhaust emission control device 2, and branch tubes 4 and 5 connected to a first exhaust port at one end, connected to a second exhaust port at the other end, and opening-connected to the enlarged chamber 6a through opening parts 4c and 5c, in which wall parts 4d and 5d are directed toward the exhaust sensor 7 at the opening parts 4c and 5c. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、内燃機関に関するものである。   The present invention relates to an internal combustion engine.

従来、この種の内燃機関としては、例えば特許文献１に開示されているように、排気通路の集合部に排気センサを設けるとともに、この集合部の下流に排気浄化装置を設けたものとなっており、この内燃機関では、排気ガスを排気センサに導くために、集合部に案内板を設けるものとしている。
実開昭６２−４７７４３号公報 Conventionally, as an internal combustion engine of this type, for example, as disclosed in Patent Document 1, an exhaust sensor is provided at a collection portion of an exhaust passage, and an exhaust purification device is provided downstream of the collection portion. In this internal combustion engine, a guide plate is provided at the collecting portion in order to guide the exhaust gas to the exhaust sensor.
Japanese Utility Model Publication No. 62-47743

しかしながら、こうした内燃機関では、案内板を別途設ける必要があり、部品点数の増大につながるとともに、排気浄化装置に導くための通路の一部を形成する集合部に案内板を設けるので、排気ガスの流れの抵抗となるという問題点があった。   However, in such an internal combustion engine, it is necessary to provide a guide plate separately, which leads to an increase in the number of parts, and a guide plate is provided at a collecting portion that forms a part of the passage for leading to the exhaust purification device. There was a problem of resistance to flow.

本発明は上記従来の問題点に鑑み案出したものであって、部品点数を増加させることなく、排気ガスを排気センサに充分に接触させることを目的の１つとし、また排気ガスの流れを良好なものとすることを目的の１つとし、さらに、排気ガスの浄化作用の向上を目的の１つとする内燃機関を提供するものであり、その請求項１は、排気マニホールドと該排気マニホールドの直下流に配置された排気浄化装置と、を備える内燃機関であって、前記排気マニホールドは、頂部に排気センサが設けられ該頂部から前記排気浄化装置が直結される下部にかけて漸次拡径された内空間を有する拡径室と、一端が第１排気ポートに接続され他端が第２排気ポートに接続されるとともに、前記拡径室に開口部をもって開口接続され、少なくとも該開口部において壁部が前記排気センサに指向してなるブランチ管とを備えることである。   The present invention has been devised in view of the above-described conventional problems, and is intended to bring exhaust gas into sufficient contact with an exhaust sensor without increasing the number of components, and the flow of exhaust gas can be reduced. The present invention provides an internal combustion engine having one of the objectives of improving the exhaust gas and further improving the purifying action of the exhaust gas. Claim 1 includes the exhaust manifold and the exhaust manifold. An exhaust gas purification device disposed immediately downstream of the exhaust manifold, wherein the exhaust manifold is provided with an exhaust sensor at a top portion and is gradually expanded in diameter from the top portion to a lower portion to which the exhaust purification device is directly connected. The expansion chamber having a space, one end connected to the first exhaust port and the other end connected to the second exhaust port, and an opening connected to the expansion chamber with an opening, at least in the opening Wall Te is that comprises a branch tube made directed to the exhaust sensor.

また請求項２は、前記壁部は、前記排気浄化装置側が前記下部にかけて漸次拡径された形状に形成されてなることである。   According to a second aspect of the present invention, the wall portion is formed in a shape in which the exhaust purification device side is gradually enlarged in diameter toward the lower portion.

また請求項３は、前記拡径室および／または前記壁部の前記下部は、前記排気浄化装置の排気浄化部と略同径となるよう拡径されてなることである。   According to a third aspect of the present invention, the diameter-expanding chamber and / or the lower portion of the wall is expanded to have substantially the same diameter as the exhaust purification unit of the exhaust purification device.

また請求項４は、前記拡径室は、前記内空間が略円蓋状または略円錐状に形成されてなることである。   According to a fourth aspect of the present invention, the inner diameter space of the expansion chamber is formed in a substantially circular lid shape or a substantially conical shape.

また請求項５は、前記ブランチ管は、略Ｕ字形状に形成されてなることである。   According to a fifth aspect of the present invention, the branch pipe is formed in a substantially U shape.

また請求項６は、前記ブランチ管は、前記壁部が前記内空間に突出して形成されてなることである。   According to a sixth aspect of the present invention, the branch pipe is formed such that the wall portion projects into the inner space.

また請求項７は、前記第１排気ポートと前記第２排気ポートとは、互いに排気干渉が発生しないポートであることである。   The seventh aspect of the present invention is that the first exhaust port and the second exhaust port are ports in which no exhaust interference occurs.

本発明の内燃機関は、排気マニホールドが、頂部に排気センサが設けられ頂部から排気浄化装置が直結される下部にかけて漸次拡径された内空間を有する拡径室と、一端が第１排気ポートに接続され他端が第２排気ポートに接続されるとともに拡径室に開口部をもって開口接続され、少なくとも開口部において壁部が排気センサに指向してなるブランチ管とを備えることにより、一端を第１排気ポートに他端を第２排気ポートに接続したブランチ管の壁部を、少なくとも拡径室との開口部において排気センサに指向するように拡径室に接続するので、部品点数の増加を招くことなく、排気ガスを排気センサに充分接触させることができる。
しかも、拡径室が、排気センサを設けた頂部から排気浄化装置が直結される下部にかけて漸次拡径された内空間を有するので、排気ガスの流れを良好に排気浄化装置に導くことができる。 In the internal combustion engine of the present invention, the exhaust manifold has an enlarged chamber having an inner space that is gradually expanded from the top to the lower portion where the exhaust purification device is directly connected, and one end is connected to the first exhaust port. The other end is connected to the second exhaust port and is connected to the diameter-expanded chamber with an opening, and at least the opening has a branch pipe whose wall faces the exhaust sensor. Since the wall portion of the branch pipe having the other end connected to the first exhaust port and the second exhaust port is connected to the expansion chamber so as to be directed to the exhaust sensor at least in the opening with the expansion chamber, the number of parts can be increased. Without inviting, the exhaust gas can be sufficiently brought into contact with the exhaust sensor.
In addition, since the expansion chamber has an inner space that is gradually expanded from the top where the exhaust sensor is provided to the lower portion where the exhaust purification device is directly connected, the flow of the exhaust gas can be favorably guided to the exhaust purification device.

また、壁部は、排気浄化装置側が下部にかけて漸次拡径された形状に形成されてなることにより、壁部も排気浄化装置側で漸次拡径された形状に形成できるため、排気ガスの流れをより良好に排気浄化装置に導くことができるものとなる。   Further, since the wall portion is formed in a shape in which the exhaust purification device side is gradually expanded in diameter toward the lower portion, the wall portion can also be formed in a shape in which the diameter is gradually expanded on the exhaust purification device side, so that the flow of exhaust gas can be reduced. It can lead to the exhaust gas purification device better.

また、拡径室および／または壁部の下部は、排気浄化装置の排気浄化部と略同径となるよう拡径されてなることにより、排気ガスを排気浄化部の略全面に接触させることができ、排気ガスの浄化作用が向上するものとなる。   Further, the diameter expansion chamber and / or the lower portion of the wall portion is expanded to have substantially the same diameter as the exhaust purification unit of the exhaust purification device, so that the exhaust gas can be brought into contact with the substantially entire surface of the exhaust purification unit. This can improve the exhaust gas purification action.

また、拡径室は、内空間が略円蓋状または略円錐状に形成されてなることにより、排気浄化装置への排気ガスの流れをより良好なものとすることができる。   Further, since the inner space of the diameter expansion chamber is formed in a substantially circular lid shape or a substantially conical shape, the flow of the exhaust gas to the exhaust purification device can be improved.

また、ブランチ管は、略Ｕ字形状に形成されてなることにより、ブランチ管をコンパクトなものとすることができ、内燃機関のコンパクト化が図れるものとなる。   Further, since the branch pipe is formed in a substantially U shape, the branch pipe can be made compact, and the internal combustion engine can be made compact.

また、ブランチ管は、壁部が内空間に突出して形成されてなることにより、より積極的に排気ガスを排気センサに導くことができるものとなる。   Further, the branch pipe is formed such that the wall portion projects into the inner space, so that the exhaust gas can be more actively guided to the exhaust sensor.

また、第１排気ポートと第２排気ポートとは、互いに排気干渉が発生しないポートであることにより、第１排気ポートからの排気と第２排気ポートからの排気とが、互いに干渉することを防止することができるものとなる。   The first exhaust port and the second exhaust port are ports that do not cause exhaust interference with each other, thereby preventing the exhaust from the first exhaust port and the exhaust from the second exhaust port from interfering with each other. Will be able to do.

以下、本発明の実施例を図面に基づいて説明する。
図１は、本発明の一実施例である内燃機関（直列４気筒）に組み付けられる排気マニホールド１と排気浄化装置２の一例を正面から見た正面構成図であり、図２は、図１の平面構成図であり、図３は、図１の右側面構成図であり、図４は、図１の底面構成図である。
また図５は、図１のＢ−Ｂ線断面図であり、図６は、図５のＣ−Ｃ線断面図である。 Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a front structural view of an example of an exhaust manifold 1 and an exhaust purification device 2 assembled in an internal combustion engine (in-line four cylinders) according to an embodiment of the present invention, and FIG. 3 is a plan configuration diagram, FIG. 3 is a right side configuration diagram of FIG. 1, and FIG. 4 is a bottom configuration diagram of FIG.
5 is a cross-sectional view taken along line BB in FIG. 1, and FIG. 6 is a cross-sectional view taken along line CC in FIG.

図において、内燃機関の排気マニホールド１は、シリンダヘッドの排気ポート部に取付固定される取付フランジ３と、取付フランジ３に接続された排気の流路としての第１ブランチ管４および第２ブランチ管５と、これら第１ブランチ管４および第２ブランチ管５に開口接続される拡径室部６とから構成されている。   In the figure, an exhaust manifold 1 of an internal combustion engine includes an attachment flange 3 attached and fixed to an exhaust port portion of a cylinder head, and a first branch pipe 4 and a second branch pipe as exhaust passages connected to the attachment flange 3. 5 and an enlarged-diameter chamber 6 that is openly connected to the first branch pipe 4 and the second branch pipe 5.

第１ブランチ管４および第２ブランチ管５は、略Ｕ字状に形成されており、第１ブランチ管４は、内燃機関の第１気筒部からの排気を排出する第１排気ポート４ａと内燃機関の第４気筒部からの排気を排出する第４排気ポート４ｂとに接続され、第２ブランチ管５は、内燃機関の第２気筒部からの排気を排出する第２排気ポート５ａと内燃機関の第３気筒部からの排気を排出する第３排気ポート５ｂとに接続される。このような接続とすることで、排気ポート４ａと４ｂおよび排気ポート５ａと５ｂは、同時期に排気が排出されることがないので、排気干渉が生じないものとなっている。   The first branch pipe 4 and the second branch pipe 5 are formed in a substantially U shape, and the first branch pipe 4 has a first exhaust port 4a for exhausting exhaust gas from the first cylinder portion of the internal combustion engine and an internal combustion engine. The second branch pipe 5 is connected to the fourth exhaust port 4b for exhausting exhaust from the fourth cylinder portion of the engine, and the second branch pipe 5 is connected to the second exhaust port 5a and internal combustion engine for exhausting exhaust from the second cylinder portion of the internal combustion engine. Is connected to a third exhaust port 5b for discharging exhaust from the third cylinder portion. With this connection, the exhaust ports 4a and 4b and the exhaust ports 5a and 5b are not exhausted at the same time, so that no exhaust interference occurs.

拡径室部６は、排気センサ７を取り付ける取付部を頂部として断面が略円形となるドーム状の本体部６’と、下端に排気浄化装置２を接続する為の連結フランジ６ｄとから構成されており、本体部の内部には、拡径室６ａが形成されている。   The expansion chamber portion 6 includes a dome-shaped main body portion 6 ′ having a substantially circular cross section with an attachment portion to which the exhaust sensor 7 is attached as a top portion, and a connecting flange 6d for connecting the exhaust purification device 2 to the lower end. An enlarged chamber 6a is formed inside the main body.

拡径室部６の本体部６’には、第１ブランチ管４が拡径室６ａに開口する開口部４ｃをもって接するように接続されているとともに、第２ブランチ管５が排気センサ７を挟んで第１ブランチ管４とは反対側のほぼ同じ高さ位置で拡径室６ａに開口する開口部５ｃをもって接するように接続されている。これにより、開口部４ｃ，５ｃは、略楕円状をなしている。   The first branch pipe 4 is connected to the main body 6 ′ of the diameter expansion chamber 6 so as to contact with the opening 4 c that opens to the diameter expansion chamber 6 a, and the second branch pipe 5 sandwiches the exhaust sensor 7. Thus, the first branch pipe 4 is connected so as to be in contact with an opening 5c that opens to the diameter-enlarged chamber 6a at substantially the same height position opposite to the first branch pipe 4. As a result, the openings 4c and 5c are substantially elliptical.

拡径室６ａは、拡径室部６の本体部６’と同様、排気センサ７を取り付ける取付部を頂部として排気浄化装置２側の下部に向かって漸次拡径された断面が略円形となるドーム状に形成されており、開口部４ｃ，５ｃの下線部において、開口部４ｃ，５ｃから排出される排気が排気センサ７の下端部に指向するように、開口部４ｃ，５ｃの下縁を形成する第１ブランチ管４および第２ブランチ管５の壁部４ｄ，５ｄを含む上傾状の壁部６ｅが突出形成されている。   As with the main body 6 ′ of the diameter expansion chamber 6, the diameter expansion chamber 6 a has a substantially circular cross section that is gradually expanded in diameter toward the lower part on the exhaust purification device 2 side with the mounting portion to which the exhaust sensor 7 is attached as the top. It is formed in a dome shape, and the lower edges of the openings 4c and 5c are arranged in the underlined portions of the openings 4c and 5c so that the exhaust discharged from the openings 4c and 5c is directed to the lower end of the exhaust sensor 7. An upwardly inclined wall portion 6e including the wall portions 4d and 5d of the first branch pipe 4 and the second branch pipe 5 to be formed is formed to protrude.

壁部６ｅは、開口部４ｃ，５ｃの下縁部において拡径室６ａの全周に亘って形成されたものとなっており、内周形状は略円形に形成されたものとなっている。また、壁部６ｅの下部は、拡径室６ａの下部と一体状に下方側に向かって漸次拡径した拡径部６ｃとなっており、排気浄化装置２への開口端の径は後述する排気浄化装置２内の排気浄化部（触媒）８の外径と略同径となるように設定されている。   The wall 6e is formed over the entire circumference of the diameter expansion chamber 6a at the lower edge of the openings 4c and 5c, and the inner peripheral shape is formed in a substantially circular shape. Further, the lower portion of the wall portion 6e is an enlarged diameter portion 6c that is gradually enlarged toward the lower side integrally with the lower portion of the enlarged diameter chamber 6a, and the diameter of the opening end to the exhaust purification device 2 will be described later. The exhaust gas purification unit (catalyst) 8 in the exhaust gas purification device 2 is set to have substantially the same diameter as the outer diameter.

排気浄化装置２は、排気ガス中の有毒なＣＯやＨＣ、ＮＯｘ等を無害なＣＯ２やＨ２Ｏ、Ｎ２にするための略円柱状の排気浄化部（触媒）８と、この触媒８を内装する略円筒形の触媒ケース７とから構成され、触媒ケース７の上端部外周に形成されたフランジ部を拡径室部６の連結フランジ６ｄにボルト締結等により連結される。 The exhaust purification device 2 includes a substantially cylindrical exhaust purification unit (catalyst) 8 for converting toxic CO, HC, NOx and the like in the exhaust gas into harmless CO 2 , H 2 O, N 2 , and the catalyst 8 And a flange portion formed on the outer periphery of the upper end portion of the catalyst case 7 is connected to a connecting flange 6d of the diameter expansion chamber portion 6 by bolt fastening or the like.

次に、こうして構成された実施例の内燃機関に組み付けられた排気マニホールド１および排気浄化装置２における排気ガスの動作について説明する。いま、第１気筒部において排気が行なわれた場合を考える。このとき、第２気筒部においては燃焼行程、第３気筒部においては吸入行程、第４気筒部においては圧縮行程が行なわれているので、第１ブランチ管４および第２ブランチ管５のそれぞれにおいて排気の干渉は起こらないものとなっている。   Next, the operation of the exhaust gas in the exhaust manifold 1 and the exhaust purification device 2 assembled in the internal combustion engine of the embodiment thus configured will be described. Consider a case where exhaust is performed in the first cylinder portion. At this time, the combustion stroke is performed in the second cylinder portion, the intake stroke is performed in the third cylinder portion, and the compression stroke is performed in the fourth cylinder portion. Therefore, in each of the first branch pipe 4 and the second branch pipe 5 Exhaust interference does not occur.

第１気筒部において排気が行なわれると、排気ガスは第１排気ポート４ａから第１ブランチ管４に排出され、第１ブランチ管４を通って開口部４ｃに達し、開口部４ｃから拡径室６ａ内に排出される。このとき、壁部６ｅ、特に壁部４ｄによって排気ガスは排気センサ７の下端部に向かって排出される。これにより、排気された排気ガスを充分に排気センサ７に接触させることができる。拡径室６ａ内に排出された排気ガスは、排気センサ７に充分に検出された後、下方側に向かって漸次拡径したドーム状の拡径室６ａの内壁および拡径部６ｃに沿って、良好に下方へ導かれる。   When exhaust is performed in the first cylinder portion, exhaust gas is discharged from the first exhaust port 4a to the first branch pipe 4, passes through the first branch pipe 4, reaches the opening 4c, and reaches the opening 4c from the opening 4c. It is discharged into 6a. At this time, the exhaust gas is discharged toward the lower end of the exhaust sensor 7 by the wall 6e, particularly the wall 4d. As a result, the exhaust gas exhausted can be sufficiently brought into contact with the exhaust sensor 7. The exhaust gas discharged into the enlarged diameter chamber 6a is sufficiently detected by the exhaust sensor 7, and then along the inner wall and the enlarged diameter portion 6c of the dome-shaped enlarged diameter chamber 6a whose diameter is gradually expanded downward. , Well guided down.

こうして下方に導かれた排気ガスは、触媒８と接触された無害なＣＯ２やＨ２Ｏ、Ｎ２に変換されて図示しない排気マフラーを介して外気に排出される。ここで、拡径部６ｃの下端である拡径室６ａの触媒８に対する開口部の径が触媒８の外径と略同径に形成されていることから、排気ガスを触媒８の略全面に良好に接触させることができ、排気ガスの浄化作用が向上するものとなる。 The exhaust gas thus guided downward is converted into harmless CO 2 , H 2 O, and N 2 in contact with the catalyst 8 and discharged to the outside air through an exhaust muffler (not shown). Here, since the diameter of the opening with respect to the catalyst 8 of the expanded diameter chamber 6a, which is the lower end of the expanded diameter portion 6c, is formed to be substantially the same as the outer diameter of the catalyst 8, exhaust gas is spread over substantially the entire surface of the catalyst 8. It can be satisfactorily brought into contact and the exhaust gas purification action is improved.

以上説明した実施例の内燃機関によれば、第１ブランチ管４および第２ブランチ管５の壁部４ｄ、５ｄを含む壁部６ｅによって部品点数を増加させることなく排気ポートから排出される排気ガスを排気センサ７に充分に接触させることができる。しかも、拡径室６ａを下方側に向かって漸次拡径したドーム状に形成することにより触媒８が接続された下方側に排気ガスを良好に導くことができる。さらに、拡径室６ａの触媒８に対する開口部の径を触媒８の外径と略同径に形成することにより、排気ガスの浄化作用を向上させることができる。   According to the internal combustion engine of the embodiment described above, the exhaust gas discharged from the exhaust port without increasing the number of parts by the wall portion 6e including the wall portions 4d and 5d of the first branch pipe 4 and the second branch pipe 5. Can be sufficiently brought into contact with the exhaust sensor 7. Moreover, the exhaust gas can be favorably guided to the lower side to which the catalyst 8 is connected by forming the diameter-expanding chamber 6a into a dome shape that gradually increases in diameter toward the lower side. Furthermore, by forming the diameter of the opening of the diameter expansion chamber 6a with respect to the catalyst 8 substantially the same as the outer diameter of the catalyst 8, the exhaust gas purification action can be improved.

実施例の内燃機関では、壁部６ｅを拡径室６ａの全周に亘って形成するものとしたが、開口部４ｃ，５ｃの下縁にのみ、即ち、壁部４ｄ，５ｄだけを形成するものとしても構わない。この場合、排気ガスを排気センサ７の下端部に指向させることができれば、壁部４ｄ，５ｄを拡径室６ａ内に突出形成させずに、壁部４ｄ，５ｄの下部が拡径室６ａに沿った形状のものとすることもできる。   In the internal combustion engine of the embodiment, the wall 6e is formed over the entire circumference of the diameter expansion chamber 6a. However, only the walls 4d and 5d are formed only at the lower edges of the openings 4c and 5c. It does n’t matter. In this case, if the exhaust gas can be directed to the lower end portion of the exhaust sensor 7, the lower portions of the wall portions 4d and 5d become the expanded diameter chamber 6a without protruding the wall portions 4d and 5d into the expanded diameter chamber 6a. It can also be of the shape along.

実施例の内燃機関では、拡径室部６および拡径室６ａをドーム状に形成するものとしたが、下方側に向かって漸次拡径していれば、例えば、略円錐状にするなど、如何なる形状であっても構わない。この場合、例えば、拡径室部６を略円錐状に形成し、拡径室６ａをドーム状に形成する等、拡径室部６と拡径室６とを異なる形状で形成することもできる。   In the internal combustion engine of the embodiment, the diameter expansion chamber portion 6 and the diameter expansion chamber 6a are formed in a dome shape. However, if the diameter gradually increases toward the lower side, for example, a substantially conical shape, Any shape may be used. In this case, for example, the diameter expansion chamber 6 and the diameter expansion chamber 6 can be formed in different shapes, for example, the diameter expansion chamber 6 is formed in a substantially conical shape and the diameter expansion chamber 6a is formed in a dome shape. .

実施例の内燃機関では、第１ブランチ管４および第２ブランチ管５を略Ｕ字状に形成するものとしたが、両端が互いに排気干渉を生じない排気ポートに接続されていれば、例えば、略Ｗ字状や略Ｖ字状に形成するもの等、如何なる形状であっても構わない。   In the internal combustion engine of the embodiment, the first branch pipe 4 and the second branch pipe 5 are formed in a substantially U shape, but if both ends are connected to exhaust ports that do not cause exhaust interference with each other, for example, Any shape such as a substantially W-shape or a substantially V-shape may be used.

以上、本発明の実施の形態について実施例を用いて説明したが、本発明はこうした実施例に何等限定されるものではなく、本発明の要旨を逸脱しない範囲において、種々なる形態で実施し得ることは勿論である。   Although the embodiments of the present invention have been described with reference to the embodiments, the present invention is not limited to these embodiments and can be implemented in various forms without departing from the gist of the present invention. Of course.

本発明の一実施例である内燃機関に組み付けられる排気マニホールドと排気浄化装置の一例を正面から見た正面構成図である。It is the front lineblock diagram which looked at an example of the exhaust manifold assembled to the internal-combustion engine which is one example of the present invention, and an exhaust purification device from the front. 図１の平面構成図である。It is a plane block diagram of FIG. 図１の右側面構成図である。It is a right-side block diagram of FIG. 図１の排気マニホールドの底面構成図である。FIG. 2 is a bottom view of the exhaust manifold of FIG. 1. 図１におけるＢ−Ｂ線断面図である。It is the BB sectional view taken on the line in FIG. 図５におけるＣ−Ｃ線断面図である。It is CC sectional view taken on the line in FIG.

符号の説明Explanation of symbols

１ 排気マニホールド
２ 排気浄化装置
３ 取付フランジ
４ 第１ブランチ管
４ａ 第１排気ポート
４ｂ 第４排気ポート
４ｃ 開口部
４ｄ 壁部
５ 第２ブランチ管
５ａ 第２排気ポート
５ｂ 第３排気ポート
５ｃ 開口部
５ｄ 壁部
６ 拡径室部
６’ 本体部
６ａ 拡径室
６ｃ 拡径部
６ｄ 連結フランジ
６ｅ 壁部
７ 触媒ケース
８ 排気浄化部（触媒） DESCRIPTION OF SYMBOLS 1 Exhaust manifold 2 Exhaust gas purification device 3 Mounting flange 4 1st branch pipe 4a 1st exhaust port 4b 4th exhaust port 4c Opening part 4d Wall part 5 2nd branch pipe 5a 2nd exhaust port 5b 3rd exhaust port 5c Opening part 5d Wall portion 6 Expanded chamber portion 6 'Main body portion 6a Expanded chamber 6c Expanded portion 6d Connection flange 6e Wall portion 7 Catalyst case 8 Exhaust gas purification portion (catalyst)

Claims (7)

排気マニホールドと、該排気マニホールドの直下流に配置された排気浄化装置と、を備える内燃機関であって、
前記排気マニホールドは、
頂部に排気センサが設けられ、該頂部から前記排気浄化装置が直結される下部にかけて漸次拡径された内空間を有する拡径室と、
一端が第１排気ポートに接続され他端が第２排気ポートに接続されるとともに、前記拡径室に開口部をもって開口接続され、少なくとも該開口部において壁部が前記排気センサに指向してなるブランチ管と、
を備える内燃機関。 An internal combustion engine comprising an exhaust manifold and an exhaust purification device disposed immediately downstream of the exhaust manifold,
The exhaust manifold is
An expansion sensor having an inner space that is provided with an exhaust sensor at the top and gradually increases in diameter from the top to the lower part directly connected to the exhaust purification device;
One end is connected to the first exhaust port and the other end is connected to the second exhaust port, and the diameter-expanded chamber is open-connected with an opening, and at least the wall in the opening is directed to the exhaust sensor. A branch pipe,
An internal combustion engine. 前記壁部は、前記排気浄化装置側が前記下部にかけて漸次拡径された形状に形成されてなる請求項１に記載の内燃機関。   2. The internal combustion engine according to claim 1, wherein the wall portion is formed in a shape in which the diameter of the exhaust purification device is gradually expanded toward the lower portion. 前記拡径室および／または前記壁部の前記下部は、前記排気浄化装置の排気浄化部と略同径となるよう拡径されてなる請求項２に記載の内燃機関。   The internal combustion engine according to claim 2, wherein the diameter expansion chamber and / or the lower portion of the wall portion is expanded to have substantially the same diameter as the exhaust purification portion of the exhaust purification device. 前記拡径室は、前記内空間が略円蓋状または略円錐状に形成されてなる請求項１ないし請求項３いずれかに記載の内燃機関。   The internal combustion engine according to any one of claims 1 to 3, wherein the inner diameter space of the expansion chamber is formed in a substantially circular lid shape or a substantially conical shape. 前記ブランチ管は、略Ｕ字形状に形成されてなる請求項１ないし請求項４いずれかに記載の内燃機関。   The internal combustion engine according to any one of claims 1 to 4, wherein the branch pipe is formed in a substantially U shape. 前記ブランチ管は、前記壁部が前記内空間に突出して形成されてなる請求項１または請求項５に記載の内燃機関。   6. The internal combustion engine according to claim 1, wherein the branch pipe is formed such that the wall portion projects into the inner space. 前記第１排気ポートと前記第２排気ポートとは、互いに排気干渉が発生しないポートである請求項１ないし請求項６いずれかに記載の内燃機関。   The internal combustion engine according to any one of claims 1 to 6, wherein the first exhaust port and the second exhaust port are ports that do not cause exhaust interference with each other.
JP2005182704A 2005-06-22 2005-06-22 Internal combustion engine Expired - Fee Related JP4558592B2 (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6078927U (en) * 1983-11-04 1985-06-01 株式会社日本自動車部品総合研究所 exhaust manifold
JPS6247743U (en) * 1985-09-11 1987-03-24
JPH0868316A (en) * 1994-08-29 1996-03-12 Honda Motor Co Ltd Exhaust device for multi-cylinder internal combustion engine
JPH09280039A (en) * 1996-04-10 1997-10-28 Yutaka Giken Co Ltd Exhaust manifold with o2 sensor
JP2000248926A (en) * 1999-03-02 2000-09-12 Yutaka Giken Co Ltd Double pipe exhaust manifold
JP2002266635A (en) * 2001-03-06 2002-09-18 Aichi Mach Ind Co Ltd Exhaust passage structure
JP2003120286A (en) * 2001-09-28 2003-04-23 Hyundai Motor Co Ltd Exhaust manifold structure of automobile

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6078927U (en) * 1983-11-04 1985-06-01 株式会社日本自動車部品総合研究所 exhaust manifold
JPS6247743U (en) * 1985-09-11 1987-03-24
JPH0868316A (en) * 1994-08-29 1996-03-12 Honda Motor Co Ltd Exhaust device for multi-cylinder internal combustion engine
JPH09280039A (en) * 1996-04-10 1997-10-28 Yutaka Giken Co Ltd Exhaust manifold with o2 sensor
JP2000248926A (en) * 1999-03-02 2000-09-12 Yutaka Giken Co Ltd Double pipe exhaust manifold
JP2002266635A (en) * 2001-03-06 2002-09-18 Aichi Mach Ind Co Ltd Exhaust passage structure
JP2003120286A (en) * 2001-09-28 2003-04-23 Hyundai Motor Co Ltd Exhaust manifold structure of automobile

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