JPH0441215Y2 - - Google Patents
Info
- Publication number
- JPH0441215Y2 JPH0441215Y2 JP1986146431U JP14643186U JPH0441215Y2 JP H0441215 Y2 JPH0441215 Y2 JP H0441215Y2 JP 1986146431 U JP1986146431 U JP 1986146431U JP 14643186 U JP14643186 U JP 14643186U JP H0441215 Y2 JPH0441215 Y2 JP H0441215Y2
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- oxygen sensor
- exhaust
- curvature
- pipes
- 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
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 61
- 239000001301 oxygen Substances 0.000 claims description 61
- 229910052760 oxygen Inorganic materials 0.000 claims description 61
- 230000009977 dual effect Effects 0.000 claims description 29
- 239000000463 material Substances 0.000 claims description 9
- 238000009434 installation Methods 0.000 claims description 7
- 239000007789 gas Substances 0.000 description 12
- 238000001514 detection method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000011144 upstream manufacturing Methods 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 238000003756 stirring Methods 0.000 description 3
- 102000004190 Enzymes Human genes 0.000 description 2
- 108090000790 Enzymes Proteins 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- NCGICGYLBXGBGN-UHFFFAOYSA-N 3-morpholin-4-yl-1-oxa-3-azonia-2-azanidacyclopent-3-en-5-imine;hydrochloride Chemical compound Cl.[N-]1OC(=N)C=[N+]1N1CCOCC1 NCGICGYLBXGBGN-UHFFFAOYSA-N 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 210000003437 trachea Anatomy 0.000 description 1
Landscapes
- Exhaust Silencers (AREA)
Description
【考案の詳細な説明】
［産業上の利用分野］
本考案はデユアル部を有する排気管における酸
素センサ取り付け構造に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an oxygen sensor mounting structure in an exhaust pipe having a dual section.
［従来の技術］
デユアルエキゾーストマニホルドに取り付けら
れる排気管は、上流側にデユアル部を有し、下流
側はシングル部となつている。デユアル部を有す
る排気通路に酸素センサを取り付けるときは、エ
キゾーストマニホルドのブランチの合流部か、ま
たはそれより下流の合流部でなければならない。[Prior Art] An exhaust pipe attached to a dual exhaust manifold has a dual portion on the upstream side and a single portion on the downstream side. When installing an oxygen sensor in an exhaust passage having a dual section, it must be installed at the junction of the exhaust manifold branches or at the junction downstream thereof.
エキゾーストマニホルドの合流部に酸素センサ
を設置する例としては、たとえば実開昭61−
19754号公報があり、概略で示すと第３図のよう
になる。第３図の例では、エキゾーストマニホル
ド１にデユアル触媒コンバータ２，３が接続さ
れ、さらにフロントパイプ４のデユアル部５が接
続され、デユアル部５はシングル部６にまとめら
れて、触媒コンバータ７を経てテールパイプ８に
接続される。酸素センサ９，１０はエキゾースト
マニホルド１の合流部と排気管デユアル部５の合
流部に配設される。 An example of installing an oxygen sensor at the confluence part of the exhaust manifold is
No. 19754 is available, and the outline is shown in Figure 3. In the example shown in FIG. 3, dual catalytic converters 2 and 3 are connected to the exhaust manifold 1, and a dual section 5 of a front pipe 4 is also connected. Connected to pipe 8. The oxygen sensors 9 and 10 are disposed at the junction of the exhaust manifold 1 and the exhaust pipe dual section 5.
デユアル排気管の合流部に酸素センサを設ける
例としては、たとえば実開昭60−3225号公報があ
り、概略で示すと通常第４図のようになる。第４
図の例では、エキゾーストマニホルド１に、フロ
ントパイプ４のデユアル部５が接続され、デユア
ル部５はシングル部６にまとめられて、触媒コン
バータ７を経てテールパイプ８に接続される。酸
素センサ１０は排気管デユアル部５の合流部に配
設される。 An example of providing an oxygen sensor at the junction of dual exhaust pipes is disclosed in Japanese Utility Model Application Laid-Open No. 60-3225, which is generally shown in FIG. 4. Fourth
In the illustrated example, a dual portion 5 of a front pipe 4 is connected to the exhaust manifold 1, and the dual portion 5 is combined into a single portion 6 and connected to a tail pipe 8 via a catalytic converter 7. The oxygen sensor 10 is disposed at the merging portion of the exhaust pipe dual portion 5.
従来の排気通路合流部への酸素センサ１０の設
置は、従来第５図のようになつている。すなわ
ち、デユアル部５の２つの通路５ａ，５ｂの流れ
の合流点のすぐ下流側の位置に、シングル部６の
側壁より酸素センサ１０を貫通せて設けるか、ま
たはそれより少し下流側に隔たつた位置に設ける
（第５図の酸素センサ１０′の位置）。 The conventional arrangement of the oxygen sensor 10 at the confluence of exhaust passages is as shown in FIG. That is, the oxygen sensor 10 is provided at a position immediately downstream of the confluence of the flows of the two passages 5a and 5b of the dual section 5, penetrating the side wall of the single section 6, or is separated slightly downstream from the side wall of the single section 6. (the position of the oxygen sensor 10' in FIG. 5).
［考案が解決しようとする問題点］
しかしながら、第３図に示す酸素センサ位置で
あつても第４図に示す下流側の配置センサ配置で
あつても、第５図に示すような酸素センサの従来
配置構造では、デユアル部５の２つの管５ａ，５
ｂを流れてくる流れＡ，Ｂはデユアル部５を出て
シングル部６の対向する管壁迄ほぼストレートに
流れそこで折れ曲つて管壁に沿つて流れるので、
一方の管壁に取り付けられた酸素センサ１０は片
方の流れＢにあたるが、他方の流れＡにはあたり
にくい。このため、各気筒からの排気ガスが均等
に酸素センサにあたらなくなつて酸素センサのガ
スあたりが悪くなり、一方の流れＡに対する酸素
濃度の検出精度が低下する。[Problems to be solved by the invention] However, regardless of the oxygen sensor position shown in FIG. 3 or the downstream sensor arrangement shown in FIG. 4, the oxygen sensor as shown in FIG. In the conventional arrangement structure, the two pipes 5a, 5 of the dual part 5
Flows A and B flowing through b exit the dual part 5 and flow almost straight to the opposing pipe wall of the single part 6, where they bend and flow along the pipe wall.
The oxygen sensor 10 attached to one pipe wall is in contact with one flow B, but is unlikely to be in contact with the other flow A. For this reason, the exhaust gas from each cylinder does not hit the oxygen sensor evenly, resulting in poor gas contact with the oxygen sensor, and the detection accuracy of the oxygen concentration for one flow A is reduced.
また、酸素センサへのガスあたりを良好にし、
かつ均等にするために、酸素センサ設置部位また
はその上流側に、ガス流れを酵素センサに向ける
案内板あるいは突起等を付けたり、酵素センサ取
り付け部上流に攪拌槽を設けたりする提案がなさ
れているが、これらの手段による場合は何れも別
部材で案内板等を構成して取り付けるため、構造
が複雑になるとともに管内への溶接取付けが難し
くなるか、攪拌槽の設置等のために車両への搭載
性の自由度が低下するか、案内板が抵抗になつた
り強制攪拌を伴なつたりしエンジン排圧が上昇し
エンジンの出力低下を招く、等の問題があつた。 In addition, it improves the gas contact with the oxygen sensor,
In order to make the flow even, proposals have been made to attach a guide plate or protrusion to direct the gas flow toward the enzyme sensor at or upstream of the oxygen sensor installation site, or to install a stirring tank upstream of the enzyme sensor installation site. However, in all of these methods, the guide plate etc. is made up of separate parts and attached, making the structure complicated and difficult to weld into the pipe, or requiring installation of a stirring tank on the vehicle. There were problems such as a reduction in the degree of freedom in mounting, or the guide plate acting as resistance or forced agitation, resulting in an increase in engine exhaust pressure and a decrease in engine output.
本考案は、酸素センサへの排気ガスあたりを改
善し、酸素センサ濃度検出精度を向上されること
を目的とし、しかも、これを部品点数増加や取付
け困難化を伴なわない単純な構造で、かつ本質的
に排圧上昇を伴なわない構造で達成することを目
的とする。 The purpose of this invention is to improve the exhaust gas contact with the oxygen sensor and improve the oxygen sensor concentration detection accuracy, and to achieve this with a simple structure that does not increase the number of parts or make installation difficult. The aim is to achieve this with a structure that essentially does not involve an increase in exhaust pressure.
［問題点を解決するための手段］
上記目的を達成するための本考案に係る酸素セ
ンサ取り付け用排気管は、排気マニホルドより下
流に位置しパイプ材から構成した酸素センサ取付
け用排気管であつて、ほぼストレートの管と該管
より曲率半径が小の管との同径の２つの管を有す
るデユアル部を下流に向つて拡径する集合部で集
合させて前記２つの管の断面積の和以上の断面積
を有する１つの管からなるシングル部に接続し、
前記曲率半径が小側の管の外壁の接線の延長線と
管壁との交点に酸素センサの中心軸がくるように
酸素センサの設置位置を定め、前記曲率半径が小
側の管のパイプ材先端を前記ほぼストレートの管
の前記曲率半径小側の管に最寄りの管壁の接線の
延長線迄管内に突出させて突き出し案内部を形成
した酸素センサ取り付け用排気管から成る。[Means for Solving the Problems] The exhaust pipe for attaching an oxygen sensor according to the present invention to achieve the above object is an exhaust pipe for attaching an oxygen sensor located downstream of an exhaust manifold and constructed of pipe material. , a dual part having two pipes of the same diameter, a substantially straight pipe and a pipe with a smaller radius of curvature than the pipe, is brought together at a gathering part whose diameter expands toward the downstream, so that the sum of the cross-sectional areas of the two pipes is obtained. Connected to a single part consisting of one pipe having a cross-sectional area of
The installation position of the oxygen sensor is determined so that the central axis of the oxygen sensor is at the intersection of the extension line of the tangent to the outer wall of the pipe with the smaller radius of curvature and the pipe wall, and the pipe material of the pipe with the smaller radius of curvature is The exhaust pipe is comprised of an oxygen sensor mounting exhaust pipe having a distal end protruding into the substantially straight pipe up to an extension of a tangent to the pipe wall closest to the pipe on the smaller radius of curvature side to form a protruding guide part.
［作用］
上記本考案の酸素センサ取り付け用排気管にお
いては、ほぼストレートの管を通る排気ガスの流
れが酸素センサにあたるのは当然であるが、曲率
半径が小側の管の突き出し案内部の形成と該壁の
接線上の酸素センサ配置によつて曲率半径小側の
管を通る流れも酸素センサにあたり、酸素センサ
のガスあたりが改善され、かつ均等化され、酸素
センサの検出精度は向上される。[Function] In the exhaust pipe for attaching an oxygen sensor of the present invention, it is natural that the flow of exhaust gas passing through the almost straight pipe hits the oxygen sensor, but the formation of the protruding guide part of the pipe with a small radius of curvature By arranging the oxygen sensor on the tangent to the wall, the flow passing through the pipe on the side with a smaller radius of curvature also hits the oxygen sensor, improving and equalizing the gas coverage of the oxygen sensor, and improving the detection accuracy of the oxygen sensor. .
また、曲率半径が小側の管の先端を突き出して
突き出し案内部を形成するだけで、特別に別部材
の案内板を設ける構造をとつていないから構造は
単純である。しかも、管外側から接合部を溶接で
きるので作業も容易である。 Further, the structure is simple because the tip of the tube with the smaller radius of curvature is simply protruded to form the protruding guide portion, and no special guide plate is provided as a separate member. Moreover, since the joint can be welded from the outside of the tube, the work is easy.
さらに集合部の拡管とシングル部の断面積設定
により、エンジンの排圧上昇は防止されている。 Furthermore, by expanding the converging section and setting the cross-sectional area of the single section, an increase in engine exhaust pressure is prevented.
［実施例］
以下に、本考案に係る酸素センサ取り付け用排
気管の望ましい実施例を、第１図および第２図を
参照して説明する。[Example] Hereinafter, a preferred example of the exhaust pipe for attaching an oxygen sensor according to the present invention will be described with reference to FIGS. 1 and 2.
第１図および第２図は、従来の第３図およ第４
図の酸素センサ１０設置位置近傍に対応する部位
に適用される本考案の構成を示している。図中１
１，１２は排気管フロントパイプのデユアル部を
構成する２つの管を示しており、１３は排気管フ
ロントパイプのシングル部を構成する管を示して
いる。デユアル部の２つの管１１，１２は集合部
１４で集合し、シングル部１３へと接続される。
管１１，１２，１３と集合部１４はステンレスの
パイプ材または拡管材からなり、接合部を管外側
から溶接することにより、溶接で互に接合され
る。 Figures 1 and 2 are similar to conventional Figures 3 and 4.
1 shows a configuration of the present invention applied to a portion corresponding to the vicinity of the installation position of the oxygen sensor 10 shown in the figure. 1 in the diagram
Reference numerals 1 and 12 indicate two pipes constituting a dual portion of the front exhaust pipe, and numeral 13 indicates a pipe constituting a single portion of the front exhaust pipe. The two pipes 11 and 12 of the dual section are gathered at a gathering section 14 and connected to a single section 13.
The tubes 11, 12, 13 and the gathering part 14 are made of stainless steel pipe material or expanded pipe material, and are joined to each other by welding by welding the joints from the outside of the pipes.
デユアル部を構成する２つの管１１，１２のう
ち、一方の管１２はほぼストレート（真直かまた
は真直に近い大きな曲率半径をもつて）延び、他
方の管１１は集合部１４に近い部分において管１
２の曲率半径より小の曲率半径をもつて集合部１
４に接続される。デユアル部の管１１，１２は互
に同径（直径ｄとする）であり、シングル部の管
１３の直径ＤはD2≧2d2に設定されて、その断面
積はデユアル部の管１１，１２の断面積の和以上
とされている。集合部１４は上流側から下流側に
向つて勾配をつけられて拡径され、この勾配部に
管１１が開口している。管１２の中心軸と管１３
の中心軸とはオフセツトしている。 Of the two tubes 11 and 12 constituting the dual section, one tube 12 extends almost straight (straight or with a large radius of curvature close to straight), and the other tube 11 extends in a portion close to the gathering section 14. 1
The gathering part 1 has a radius of curvature smaller than the radius of curvature of 2.
Connected to 4. The pipes 11 and 12 of the dual part have the same diameter (diameter d), the diameter D of the pipe 13 of the single part is set to D 2 ≧2d 2 , and its cross-sectional area is equal to that of the pipe 11 of the dual part, It is said to be greater than the sum of 12 cross-sectional areas. The collecting portion 14 is sloped and widened in diameter from the upstream side toward the downstream side, and the pipe 11 opens in this sloped portion. Central axis of tube 12 and tube 13
is offset from the central axis of
デユアル部の２つの管１１，１２のうち、曲率
半径小側の管１２を構成するパイプ材の先端部は
集合部１４において排気管内方に中心軸が直線状
に突出され突き出し案内部１５を形成している。
曲率半径小側の管１２の外壁（曲率の外周側壁）
も排気管内方に向つて延び、その接線延長線と排
気管の管１１に対向する側の管壁との交点Ｐに、
酸素センサ１６の中心軸がくるように、酸素セン
サ１６の配設位置が定められている。この配置に
おいては、曲率半径小側の管１１と集合部１４と
の交わる交線がほぼストレート管１２の管１１側
の管壁の接線の延長線となす角度αは、α＝
sin-1（Ｄ／ｄ−１）で決定され、曲率半径小側の
管１１の外壁の接線の延長線が管１２の管１１と
反対側の管壁となす角度βは、β＝π／２−αで
決定される。 Of the two pipes 11 and 12 of the dual section, the tip of the pipe material constituting the pipe 12 with the smaller radius of curvature has its central axis linearly protruding inward of the exhaust pipe at the gathering part 14, forming a protruding guide part 15. are doing.
Outer wall of the tube 12 on the smaller radius of curvature side (outer peripheral side wall of curvature)
extends inward of the exhaust pipe, and at the intersection P of its tangential extension line and the pipe wall of the exhaust pipe on the side opposite to the pipe 11,
The arrangement position of the oxygen sensor 16 is determined so that the central axis of the oxygen sensor 16 is aligned. In this arrangement, the angle α between the line of intersection of the pipe 11 on the side with the smaller radius of curvature and the collecting portion 14 and the extension line of the tangent to the wall of the straight pipe 12 on the pipe 11 side is α=
sin -1 (D/d-1), and the angle β between the extension line of the tangent to the outer wall of the tube 11 on the side with the smaller radius of curvature and the wall of the tube 12 on the opposite side from the tube 11 is β = π/ 2-α.
曲率半径小側の管１１を排気管内に突出するこ
とによつて形成した突き出し案内部１５の先端
は、ほぼストレートに延びる管１２の管１１側に
最寄りの管壁の接線の延長線と一致する位置まで
延ばされている。 The tip of the protruding guide portion 15 formed by protruding the pipe 11 with the smaller radius of curvature into the exhaust pipe coincides with the extension of the tangent to the pipe wall closest to the pipe 11 side of the pipe 12 that extends substantially straight. extended to the position.
デユアル部を構成する管１１，１２において、
一方の管１１は、たとえば６気管のデユアルエキ
ゾーストマニホルドの＃１，＃２，＃３気筒側に
接続され、他方の管１２はデユアルエキゾースト
マニホルドの＃４，＃５，＃６気筒側に接続され
る。気筒の点火順序は＃１，＃５，＃３，＃６，
＃２，＃４気筒の順であり、管１１と管１２から
交互に集合部１４に向つて排気ガスが流れるよう
になつている。 In the tubes 11 and 12 that constitute the dual part,
One pipe 11 is connected, for example, to the #1, #2, and #3 cylinder sides of a dual exhaust manifold with six trachea, and the other pipe 12 is connected to the #4, #5, and #6 cylinder sides of the dual exhaust manifold. Ru. The firing order of the cylinders is #1, #5, #3, #6,
The #2 and #4 cylinders are arranged in this order, and the exhaust gas flows alternately from the pipes 11 and 12 toward the collecting portion 14.
つぎに、上記のように構造、配置が特定された
酸素センサ取り付け用排気管における作用につい
て説明する。 Next, the operation of the exhaust pipe for attaching an oxygen sensor whose structure and arrangement have been specified as described above will be explained.
排気ガスは、デユアル部を構成する管１１，１
２から交互に集合部１４に流入してくる。このと
きほぼストレートの管１２を通る流れＡはそのま
ま酸素センサ１６にあたる。また、曲率半径が小
側の管１１を通つてくる流れは、外壁側の流れＢ
が該管１１および突き出し案内部１５に案内され
て酸素センサ１６の取り付け部交点Ｐに向つて流
れ、内壁側の流れＣは対向管壁にいつたんあたつ
て酸素センサ１６の根本部に向つて流れようとす
る。しかし、突き出し案内部１５によつて完全に
Ｐに向かう流れに制御できないから、流れは酸素
センサ取り付け部交点Ｐより若干酸素センサ１６
の先端側にかたより、酸素センサ１６管内突出部
に全体にあたり、管１１を通る流れも酸素センサ
１６に良好にあたる。このように管１１を通る流
れＡも管１２を通る流れＢ，Ｃも、ともに酸素セ
ンサ１６に良好にあたり、ガスあたりの改善と各
気筒均一の酸素濃度検出が行なわれ、検出結果が
極めて良好となる。 Exhaust gas flows through pipes 11, 1 forming a dual section.
2 alternately flow into the gathering part 14. At this time, the flow A passing through the substantially straight pipe 12 hits the oxygen sensor 16 as it is. Furthermore, the flow passing through the pipe 11 with the smaller radius of curvature is the flow B on the outer wall side.
is guided by the pipe 11 and the protruding guide part 15 and flows toward the intersection P of the attachment part of the oxygen sensor 16, and the flow C on the inner wall side hits the opposite pipe wall and flows toward the root part of the oxygen sensor 16. Trying to flow. However, since the flow cannot be completely controlled toward P by the protruding guide portion 15, the flow is slightly lower than the oxygen sensor attachment point intersection P at the oxygen sensor 16.
Since the oxygen sensor 16 is biased towards the distal end side, the entire protrusion in the tube of the oxygen sensor 16 is hit, and the flow passing through the tube 11 also hits the oxygen sensor 16 well. In this way, both the flow A passing through the pipe 11 and the flows B and C passing through the pipes 12 hit the oxygen sensor 16 well, improving the gas permeability and uniformly detecting the oxygen concentration in each cylinder, resulting in extremely good detection results. Become.
また、本考案構造においては、曲率半径小側の
管１１のパイプ材先端部を排気管内に一部突出さ
せて溶解するだけで突き出し案内部１５を形成
し、特別に別部材からなる案内板を設けていない
から、構造は極めて単純である。また、溶接は管
外から行なわれるので、作業は容易である。この
ような単純構造は、車両への搭載性に自由度をも
たせる。また、集合部１４は下流に向つて徐々に
拡径され、D2≧2d2の断面積を有するシングル部
の管１３へと接続されるので、管１１，管１２を
通る何れの流れも絞られることがなく、従来の案
内板による流れの絞り、攪拌槽による流れの攪拌
において生じていたような、エンジンの排圧上昇
はない。この場合、管１１，１２の流れは交互に
流れるが、互いの流れに若干の干渉があるため、
それを抑制するためにD2≧2d2とされ、排圧上昇
を完全に防止している。集合部１４に突き出し案
内部１５が突き出ていても、突き出し案内部１５
の突き出し量が、ほぼストレートの管１２の管１
１側の管壁の接線の延長線よりは突き出していな
いので、突き出し案内部１５がほぼストレートの
管１２の流れＡを妨げることはなく、この点にお
いてもエンジンの排圧上昇防止は完全なものとな
つている。さらに、酸素センサ１６は、エキゾー
ストマニホルドより下流側に離れて取り付けられ
ているので、エキゾーストマニホルドから酸素セ
ンサ１６の位置まで排気ガスが流れてくる間に約
50℃の温度低下があり、酸素センサ１６の熱劣化
が効果的に防止されている。 In addition, in the structure of the present invention, the protruding guide portion 15 is formed by simply partially protruding the tip of the pipe material of the pipe 11 on the small radius of curvature side into the exhaust pipe and melting it, and a special guide plate made of a separate member is formed. Since it is not provided, the structure is extremely simple. Furthermore, since welding is performed from outside the pipe, the work is easy. Such a simple structure allows flexibility in mounting on a vehicle. In addition, since the gathering part 14 gradually expands in diameter toward the downstream and is connected to the single part pipe 13 having a cross-sectional area of D 2 ≧2d 2 , the flow passing through the pipes 11 and 12 is restricted. There is no increase in engine exhaust pressure, which occurs when the flow is restricted by a guide plate or stirred by a stirring tank in the past. In this case, the flows in the pipes 11 and 12 alternate, but there is some interference between the flows, so
In order to suppress this, D 2 ≧2d 2 is set to completely prevent an increase in exhaust pressure. Even if the protruding guide part 15 protrudes from the gathering part 14, the protruding guide part 15
Pipe 1 of pipe 12 whose protrusion amount is almost straight
Since it does not protrude beyond the extension line of the tangent to the pipe wall on the first side, the protruding guide part 15 does not obstruct the flow A of the almost straight pipe 12, and in this respect as well, the exhaust pressure of the engine is completely prevented from rising. It is becoming. Furthermore, since the oxygen sensor 16 is installed downstream from the exhaust manifold, the exhaust gas flows approximately from the exhaust manifold to the oxygen sensor 16.
There is a temperature drop of 50° C., and thermal deterioration of the oxygen sensor 16 is effectively prevented.
［考案の効果］
以上説明したことから明らかなように、本考案
に係る酸素センサ取り付け用排気管によれば、次
の諸効果が得られる。[Effects of the Invention] As is clear from the above explanation, the exhaust pipe for attaching an oxygen sensor according to the present invention provides the following effects.
イ 曲率半径小側の外壁の接線の延長線と対向排
気管管壁との交点に酸素センサの配設位置を定
め、かつ曲率半径小側の管の外壁を延長して突
き出し案内部を形成したことにより、酸素セン
サへの確実なガスあたりを実現できる。(b) The oxygen sensor is located at the intersection of the extension of the tangent to the outer wall on the side with a smaller radius of curvature and the wall of the opposing exhaust pipe, and the outer wall of the pipe on the side with a smaller radius of curvature is extended to form a protruding guide part. By doing so, reliable gas contact with the oxygen sensor can be realized.
ロ シングル部の断面積をデユアル部の２つの管
の断面積の和以上とし、突き出し案内部をほぼ
ストレート管の接線の位置までの突出したこと
により、エンジンの排圧上昇を防止できる。(b) By making the cross-sectional area of the single part greater than or equal to the sum of the cross-sectional areas of the two pipes of the dual part, and by protruding the protruding guide part to a position approximately tangent to the straight pipe, an increase in the exhaust pressure of the engine can be prevented.
ハ 曲率半径小側の管のパイプ材先端部を排気管
内に突出した突き出し案内部構成としたので、
別部材の案内板を設ける必要がなく、単純な構
造とすることができる。また、管外からの溶接
で管同志を溶接接合でき、作業は容易である。
これらの単純構造によつて車両への搭載性も向
上できる。C. Since the tip of the pipe material of the pipe on the small radius of curvature side is configured as a protruding guide part that protrudes into the exhaust pipe,
There is no need to provide a guide plate as a separate member, and the structure can be simple. In addition, the pipes can be welded together by welding from outside the pipe, making the work easy.
These simple structures also improve the ease of mounting on a vehicle.
ニ 排気管の集合部を含む下流側への酸素センサ
設置とすることができ、酸素センサの熱劣化を
防止できる。D. The oxygen sensor can be installed on the downstream side including the collecting part of the exhaust pipe, and thermal deterioration of the oxygen sensor can be prevented.
第１図は本考案の一実施例に係る酸素センサ取
り付け用排気管の断面図、第２図は第１図の−
線に沿う断面図、第３図はデユアル部集合部へ
酸素センサを取り付ける場合の排気管系統図、第
４図はエキゾーストマニホルド集合部およびデユ
アル部の集合部両方に酸素センサを取り付ける場
合の排気管系統図、第５図は従来の排気管集合部
への酸素センサ取り付けを示す断面図、である。
１１……曲率半径小側の管、１２……ほぼスト
レートの管、１３……シングル部の管、１４……
集合部、１５……突き出し案内部、１６……酸素
センサ。
Fig. 1 is a sectional view of an exhaust pipe for attaching an oxygen sensor according to an embodiment of the present invention, and Fig. 2 is a -
A cross-sectional view along the line, Figure 3 is an exhaust pipe system diagram when an oxygen sensor is attached to the dual part gathering part, and Figure 4 is an exhaust pipe diagram when an oxygen sensor is installed to both the exhaust manifold gathering part and the dual part gathering part. The system diagram and FIG. 5 are cross-sectional views showing the attachment of an oxygen sensor to a conventional exhaust pipe gathering section. 11... Pipe with small radius of curvature, 12... Almost straight pipe, 13... Single section pipe, 14...
Gathering part, 15... Protrusion guide part, 16... Oxygen sensor.
Claims (1)
構成した酸素センサ取り付け用排気管であつて、
ほぼストレートの管と該管より曲率半径が小の管
との同径の２つの管を有するデユアル部を下流に
向つて拡径する集合部で集合させて前記２つの管
の断面積の和以上の断面積を有する１つの管から
なるシングル部に接続し、前記曲率半径が小側の
管の外壁の接線の延長線と管壁との交点に酸素セ
ンサの中心軸がくるように酸素センサの設置位置
を定め、前記曲率半径が小側の管のパイプ材先端
を前記ほぼストレートの管の前記曲率半径小側の
管に最寄りの管壁の接線の延長線迄管内に突出さ
せて突き出し案内部を形成したことを特徴とする
酸素センサ取り付け用排気管。 An exhaust pipe for mounting an oxygen sensor located downstream of the exhaust manifold and constructed from pipe material,
A dual part having two pipes of the same diameter, a substantially straight pipe and a pipe with a radius of curvature smaller than the said pipe, is brought together at a gathering part whose diameter expands toward the downstream, and the cross-sectional area of the two pipes is larger than the sum of the cross-sectional areas of the two pipes. The oxygen sensor is connected to a single part consisting of one tube having a cross-sectional area of The installation position is determined, and the tip of the pipe material of the pipe with the smaller radius of curvature is made to protrude into the pipe up to the extension of the tangent to the pipe wall closest to the pipe with the smaller radius of curvature of the substantially straight pipe, and the protruding guide part An exhaust pipe for attaching an oxygen sensor, characterized in that the exhaust pipe has the following features:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986146431U JPH0441215Y2 (en) | 1986-09-26 | 1986-09-26 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986146431U JPH0441215Y2 (en) | 1986-09-26 | 1986-09-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6352916U JPS6352916U (en) | 1988-04-09 |
| JPH0441215Y2 true JPH0441215Y2 (en) | 1992-09-28 |
Family
ID=31058893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1986146431U Expired JPH0441215Y2 (en) | 1986-09-26 | 1986-09-26 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0441215Y2 (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 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58169112U (en) * | 1982-05-10 | 1983-11-11 | トヨタ自動車株式会社 | exhaust manifold |
| 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 |
-
1986
- 1986-09-26 JP JP1986146431U patent/JPH0441215Y2/ja 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 |
|---|---|
| JPS6352916U (en) | 1988-04-09 |
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