JPS5836810Y2 - Exhaust manifold for internal combustion engines - Google Patents
Exhaust manifold for internal combustion enginesInfo
- Publication number
- JPS5836810Y2 JPS5836810Y2 JP10178278U JP10178278U JPS5836810Y2 JP S5836810 Y2 JPS5836810 Y2 JP S5836810Y2 JP 10178278 U JP10178278 U JP 10178278U JP 10178278 U JP10178278 U JP 10178278U JP S5836810 Y2 JPS5836810 Y2 JP S5836810Y2
- Authority
- JP
- Japan
- Prior art keywords
- oxygen concentration
- concentration sensor
- exhaust manifold
- detection end
- internal combustion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Exhaust Silencers (AREA)
Description
【考案の詳細な説明】
本考案は、三元触媒を備えた排気ガス浄化システムに使
用される酸素濃度センサを効果的に働かせることの可能
な排気マニホルドの新規な構造に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel structure of an exhaust manifold that allows an oxygen concentration sensor used in an exhaust gas purification system equipped with a three-way catalyst to work effectively.
三元触媒（三成分同時処理触媒）によって排気ガス中の
有害三成分（即へＨＣ，ＣＯ，ＮｏＸ）を除去するため
には排気ガスの空燃比の精密制御が必要であり、そのた
め酸素濃度センサを排気系に設けここからの電気信号に
よって、空燃比を制御するようにしたシステムが既に知
られている。In order to remove the three harmful components (HC, CO, and NoX) from exhaust gas using a three-way catalyst (three-component simultaneous processing catalyst), precise control of the air-fuel ratio of the exhaust gas is required. A system is already known in which the air-fuel ratio is controlled by an electric signal provided in the exhaust system and from the electric signal.
堵で、かかるシステムにおける酸素濃度センサの取付箇
所は排気ガスが高温であることが酸素濃度の正確な検知
には必要であるという事情から、エンジン燃焼室に近い
排気マニホルドに設けるのが普通である。In such a system, the oxygen concentration sensor is usually installed in the exhaust manifold near the engine combustion chamber, since the high temperature of the exhaust gas is necessary for accurate detection of oxygen concentration. .
そして、従来の酸素濃度センサの取付を第１図によって
概説すると、１０は排気マニホルドで、エンジン（この
例では４気筒エンジン）の各気筒の燃焼室に一端が接続
される枝管部１２ａ、１２ｂｔ１２ｃｔ１２ｄと、これ
らの枝管部の他端より延びる管部１６とを備えている。To outline the installation of a conventional oxygen concentration sensor with reference to FIG. 1, 10 is an exhaust manifold, and branch pipe portions 12a, 12bt12ct12d have one end connected to the combustion chamber of each cylinder of an engine (four-cylinder engine in this example). and a tube portion 16 extending from the other end of these branch tube portions.
管部１６の端部に、図示しない排気パイプと接続するた
めのフランジ部１８が形成されている。A flange portion 18 is formed at the end of the pipe portion 16 for connection to an exhaust pipe (not shown).
２０は酸素濃度センサで排気マニホルドの管部１６に固
定されて、その検知端２２は管部１６の上側内壁面から
排気ガスに接触すべく多少突出して位置している。Reference numeral 20 denotes an oxygen concentration sensor fixed to the pipe section 16 of the exhaust manifold, and its sensing end 22 is positioned to protrude somewhat from the upper inner wall surface of the pipe section 16 so as to come into contact with the exhaust gas.
ところで、かかる従来の排気マニホルドにおける酸素濃
度センサ２０の取付けでは、枝管部１２ａｔ１２ｂｔ１
２ｃｔ１２ｄより管部１６に導入される排気ガス流が酸
素濃度センサ２０の検知端２２に均等に当らない問題が
ある。By the way, in installing the oxygen concentration sensor 20 in such a conventional exhaust manifold, the branch pipe portion 12at12bt1
There is a problem in that the exhaust gas flow introduced into the pipe portion 16 from the 2ct 12d does not evenly hit the detection end 22 of the oxygen concentration sensor 20.
即ち枝管部１２ｃ、１２ｄからの排気カスは図の破線Ｐ
の如く一旦排気マニホルド１０の下側内壁に点Ｐにて衝
突してからｙの如く反対されて酸素濃度センサの検知端
２２に接触可能であるが、枝管部１２ａ、１２ｂからの
排気ガス流は図の実線の経過Ｑで示すように排気マニホ
ルド１０の下側内壁に流れるため上側内壁に設けられた
酸素濃度センサ検知端２２に接触し難い構成となってい
る。That is, the exhaust gas from the branch pipes 12c and 12d is indicated by the broken line P in the figure.
After colliding with the lower inner wall of the exhaust manifold 10 at point P, it is reversed as shown in y and can contact the detection end 22 of the oxygen concentration sensor, but the exhaust gas flow from the branch pipes 12a and 12b As shown by the solid line curve Q in the figure, the oxygen flows to the lower inner wall of the exhaust manifold 10, so that it is difficult to come into contact with the oxygen concentration sensor detection end 22 provided on the upper inner wall.
かして、従来技術は１．酸素濃度センサ２ｏが各枝管部
１２ａ、１２ｂｔ１２ｃｔ１２ａからの排気ガスの酸素
濃度を均一に検知してないという問題点を内包するもの
である。Therefore, the conventional technology is 1. This includes the problem that the oxygen concentration sensor 2o does not uniformly detect the oxygen concentration of the exhaust gas from each branch pipe portion 12a, 12bt12ct12a.
酸素濃度の検知が不正確であると、当然のことながら、
三元触媒の三成分同時処理能力が失われることとなる。Of course, if the oxygen concentration detection is inaccurate,
The ability of the three-way catalyst to simultaneously process three components will be lost.
従って本考案の目的は、かかる従来技術の欠点を解決し
酸素濃度センサが酸素濃度を正確に検知することを確実
にする排気マニホルドの新規な構造を提供することにあ
る。It is therefore an object of the present invention to provide a novel structure for an exhaust manifold that overcomes the drawbacks of the prior art and ensures that the oxygen concentration sensor accurately detects the oxygen concentration.
第２図は本考案の第１実施例を示すもので、第１図と同
様な部品には、第１図の参照番号に１００を足した参照
番号で示される。FIG. 2 shows a first embodiment of the invention, and parts similar to those in FIG. 1 are designated by the reference numerals of FIG. 1 plus 100.
排気マニホルド１１０の管部１１６は酸素濃度センサ１
２０の取付箇所の手前で曲折され、その結果、酸素濃度
センサ１２０の検知端１２２に対面しかつこの検知端１
２２の位置よりやや上流の位置における下側内壁面が傾
斜面１５０を呈している。The pipe portion 116 of the exhaust manifold 110 is connected to the oxygen concentration sensor 1
20, and as a result, it faces the detection end 122 of the oxygen concentration sensor 120 and this detection end 1
The lower inner wall surface at a position slightly upstream from the position 22 presents an inclined surface 150.
この傾斜面１５０は枝管部１１２ａ、１１２ｂからの排
気ガスの流れＱを酸素濃度センサ１２０の検知端１２２
に指向させるような形状を持つ。This inclined surface 150 directs the flow Q of exhaust gas from the branch pipes 112a and 112b to the detection end 122 of the oxygen concentration sensor 120.
It has a shape that directs it to.
このようにすることにより枝管部１１２ａ、１１２ｂか
らの排気ガスをも酸素濃度センサ１２０の検知端１２２
に接触させ得、又枝管部１１２ｃ、１１２ｄからの排気
ガスの流れは第１図と同様破線ｐ、ｐ’の如く点、で反
対され検知端１２２に接触させ得る。By doing this, the exhaust gas from the branch pipes 112a and 112b is also transferred to the detection end 122 of the oxygen concentration sensor 120.
Also, the flow of exhaust gas from the branch pipe portions 112c and 112d can be reversed at points such as dashed lines p and p' as in FIG. 1 and brought into contact with the sensing end 122.
かくして、本考案によれば全ての枝管部１１２ａ〜ｄか
らの排気ガス流を酸素濃度センサ１２０の検知端１２２
に当てることができ精密な酸素濃度測定が可能である。Thus, according to the present invention, the exhaust gas flow from all the branch pipe sections 112a to 112d is transmitted to the detection end 122 of the oxygen concentration sensor 120.
It is possible to measure oxygen concentration accurately.
第３図に示す第二の実施例では第１図と同様な部品は第
１図の参照番号に２００を足した参照番号で示す。In the second embodiment shown in FIG. 3, parts similar to those in FIG. 1 are designated by the reference numerals of FIG. 1 plus 200.
排気マニホルド２１０の管部２１６の下側内壁には案内
突起３０が設けられる。A guide protrusion 30 is provided on the lower inner wall of the pipe portion 216 of the exhaust manifold 210 .
その案内突起３０上の傾斜面１５０は酸素濃度センサ２
２０の検知端２２２に対面しかつこの検知端２２２の位
置よりやや上流に位置している。The inclined surface 150 on the guide protrusion 30 is connected to the oxygen concentration sensor 2.
It faces the detection end 222 of No. 20 and is located slightly upstream from the detection end 222.
そのため第２図の実施例と同様、枝管部２１２ａ。Therefore, as in the embodiment of FIG. 2, the branch pipe portion 212a.
２１２ｂからの排気ガスの流れＱを酸素濃度センサ２２
０の検知端２２２に指向させることができる。The flow Q of exhaust gas from 212b is detected by the oxygen concentration sensor 22.
0 detection end 222.
そのため第１の実施例と同様全ての枝管部２１２ａ−ｄ
からの排気ガスの流れを酸素濃度センサ２２０の検知端
２２２に当てることが可能となり、この第３図の実施例
にあっても酸素濃度の精密検知が担保される。Therefore, as in the first embodiment, all the branch pipe parts 212a-d
It becomes possible to direct the flow of exhaust gas from the oxygen concentration sensor 220 to the detection end 222 of the oxygen concentration sensor 220, and accurate detection of the oxygen concentration is ensured even in the embodiment shown in FIG.
第１図は従来の排気マニホルドを示す図、第２図及び第
３図は夫々本考案に係る排気マニホルドを示す図である
。
１０（１１０，２１０）・・・排気マニホルド、１２（
１１２，２１２）・・・枝管部、１６（１１６２１６）
管部、２０（１２０，２２０）、・・酸素濃度センサ、
２２（１２２，２２２）・・・酸素濃度センサ検知端、
１５０・・・傾斜面。FIG. 1 shows a conventional exhaust manifold, and FIGS. 2 and 3 show exhaust manifolds according to the present invention, respectively. 10(110,210)...exhaust manifold, 12(
112,212)...Branch pipe section, 16 (116216)
Pipe part, 20 (120, 220), ... oxygen concentration sensor,
22 (122, 222)...Oxygen concentration sensor detection end,
150...Slope surface.
Claims (1)
部と、該枝管部の他端より延びるーっの管部とより威る
排気マニホルドを備え、該管部の内壁面に酸素濃度セン
サ検知端を位置させた内燃機関の排気系の構造において
、前記酸素濃度センサ検知端１２２；２２０に対面しか
つこの酸素濃度センサ検知端の位置よりやや上流の位置
における前記管部１１６；２１６の内壁面に、前記枝管
部１１２ａ：１１２ｂからの排気ガスの流れを酸素濃度
センサ検知端１２２；２２０に指向せしめる傾斜面１５
０を設けたことを特徴とする内燃機関用排気マニホルド
。It is equipped with a plurality of branch pipe sections whose one end is connected to the combustion chamber of the cylinder of the engine, a pipe section extending from the other end of the branch pipe section, and a more powerful exhaust manifold. In the structure of the exhaust system of an internal combustion engine in which the concentration sensor detection end is located, the pipe portion 116; 216 is located at a position facing the oxygen concentration sensor detection end 122; 220 and slightly upstream from the oxygen concentration sensor detection end An inclined surface 15 that directs the flow of exhaust gas from the branch pipe portions 112a: 112b toward the oxygen concentration sensor detection end 122; 220 is provided on the inner wall surface of the
An exhaust manifold for an internal combustion engine, characterized in that an exhaust manifold is provided with a zero.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10178278U JPS5836810Y2 (en) | 1978-07-26 | 1978-07-26 | Exhaust manifold for internal combustion engines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10178278U JPS5836810Y2 (en) | 1978-07-26 | 1978-07-26 | Exhaust manifold for internal combustion engines |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5520611U JPS5520611U (en) | 1980-02-08 |
| JPS5836810Y2 true JPS5836810Y2 (en) | 1983-08-19 |
Family
ID=29040736
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10178278U Expired JPS5836810Y2 (en) | 1978-07-26 | 1978-07-26 | Exhaust manifold for internal combustion engines |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5836810Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108952917A (en) * | 2017-05-19 | 2018-12-07 | 本田技研工业株式会社 | The exhaust apparatus of internal combustion engine |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6054551U (en) * | 1983-09-22 | 1985-04-17 | 株式会社 大和鉄工所 | Label for sealing the cap of containers such as drums |
| JP5772567B2 (en) * | 2011-12-16 | 2015-09-02 | トヨタ自動車株式会社 | Exhaust pipe |
-
1978
- 1978-07-26 JP JP10178278U patent/JPS5836810Y2/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108952917A (en) * | 2017-05-19 | 2018-12-07 | 本田技研工业株式会社 | The exhaust apparatus of internal combustion engine |
| CN108952917B (en) * | 2017-05-19 | 2020-10-30 | 本田技研工业株式会社 | Exhaust device for internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5520611U (en) | 1980-02-08 |
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