JP2566301Y2 - Exhaust sensor mounting structure - Google Patents
Exhaust sensor mounting structureInfo
- Publication number
- JP2566301Y2 JP2566301Y2 JP1992072307U JP7230792U JP2566301Y2 JP 2566301 Y2 JP2566301 Y2 JP 2566301Y2 JP 1992072307 U JP1992072307 U JP 1992072307U JP 7230792 U JP7230792 U JP 7230792U JP 2566301 Y2 JP2566301 Y2 JP 2566301Y2
- Authority
- JP
- Japan
- Prior art keywords
- exhaust
- exhaust sensor
- mounting structure
- collecting pipe
- exhaust gas
- 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 - Lifetime
Links
Landscapes
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Exhaust Silencers (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本考案は，内燃機関の排気系にお
ける排気ガスの状態を検出する排気センサの取付構造に
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure of an exhaust sensor for detecting a state of exhaust gas in an exhaust system of an internal combustion engine.
【０００２】[0002]
【従来の技術】近年における内燃機関では，排気ガスの
浄化の促進を図る目的で，排気ガス中におけるＯ2 等の
濃度に応じて，吸気系における空燃比をフィードバック
制御することが行われており，このフィードバック制御
に際しては，排気ガス中のＯ2等の濃度が排気系に設け
られた排気センサにより検出される。そして，上記のよ
うな排気センサの排気系への取付構造としては，例えば
実開昭６０−６１４２９号公報に開示のものが知られて
いる。上記公報に開示の取付構造では，排気マニホール
ドの適宜箇所に膨出部を設け，その内部に感応部を突出
させるようにして上記排気センサが取付けられている。
上記のように感応部の突出部分に対応させて膨出部が設
けられているのは，この感応部の突出により管路内にお
ける排気ガスの流通断面積が減少するのを回避するため
である。2. Description of the Related Art In recent years, in an internal combustion engine, in order to promote purification of exhaust gas, feedback control of an air-fuel ratio in an intake system is performed according to a concentration of O 2 or the like in the exhaust gas. , in the feedback control, the concentration of O 2 or the like in the exhaust gas is detected by the exhaust sensor provided in the exhaust system. As an attachment structure of the exhaust sensor to the exhaust system as described above, for example, one disclosed in Japanese Utility Model Laid-Open Publication No. 60-61429 is known. In the mounting structure disclosed in the above publication, a bulging portion is provided at an appropriate position of the exhaust manifold, and the exhaust sensor is mounted so that the sensitive portion protrudes inside the bulging portion.
The reason why the bulging portion is provided corresponding to the protruding portion of the sensitive portion as described above is to avoid a reduction in the flow cross-sectional area of the exhaust gas in the pipeline due to the protruding portion of the sensitive portion. .
【０００３】[0003]
【考案が解決しようとする課題】ところが，上記のよう
に排気マニホールドに膨出部を設け，その内部に単に排
気センサの感応部を突出させた構造では，管内を流通す
る排気ガスが適度に混合されず，従って，排気ガス中の
濃度成分が該管内における排気ガスの流通部位に応じて
は不均一となり，精度の良い濃度検出の結果を得ること
ができない。そこで，本考案は，上記事情に鑑みて創案
されたものであり，排気マニホールドに繋がる集合管内
への感応部の突出による排気ガスの流通断面積の減少を
回避しつつ，該排気ガスを適宜混合してその濃度分布を
ほぼ均一な状態となし得る排気センサの取付構造の提供
を目的とするものである。However, in the structure in which the swelling portion is provided in the exhaust manifold and the sensitive portion of the exhaust sensor is simply protruded inside the exhaust manifold as described above, the exhaust gas flowing through the pipe is mixed appropriately. Therefore, the concentration component in the exhaust gas becomes non-uniform depending on the location of the exhaust gas flow in the pipe, so that accurate concentration detection results cannot be obtained. The present invention has been developed in view of the above problem, while avoiding a reduction in cross-sectional flow area of the exhaust gas by projecting the sensitive part to a collection tube leading to the exhaust manifold, as appropriate exhaust gas It is an object of the present invention to provide a mounting structure of an exhaust sensor capable of mixing to make the concentration distribution substantially uniform.
【０００４】[0004]
【課題を解決するための手段】上記目的を達成するため
に，本考案が採用する主たる手段は，その要旨とすると
ころが，内燃機関の排気マニホールドに繋がる集合管の
途中の適宜部位に設置され，その感応部が該管経路の内
部に突出される排気センサの取付構造において，上記集
合管の上記排気センサの設置部位に，該集合管の軸芯方
向に係る内面上縁部分を該集合管の内面に沿わせて断面
が上記排気センサの軸芯上にずらされた略円形状の膨出
部を形成した点に係る排気センサの取付構造である。In order to achieve the above-mentioned object, the main means adopted by the present invention is, in its gist, a collecting pipe connected to an exhaust manifold of an internal combustion engine .
It is installed at an appropriate site in the middle, in the mounting structure of an exhaust sensor that sensitive part is protruded to the inside of the tube path, the current
The installation portion of the exhaust sensor case tube, a substantially circular shape the internal surface upper portion of the axial direction of the collecting pipe in and along the inner surface of the collecting pipe cross section are displaced on the axis of the exhaust sensor Fig. 5 is a mounting structure of an exhaust sensor according to a point where a bulging portion is formed.
【０００５】[0005]
【作用】上記構成に係る排気センサの取付構造では，そ
の感応部の突出部位に対応して膨出部が設けられている
ことから，その部分での排気ガスの流通断面積の減少を
回避することができる。そして，この膨出部は，上述の
如く，管経路の軸芯方向に係る内面上縁部分を該管経路
の内面に沿わせて断面が排気センサの軸芯上にずらされ
ているので，この部分を流通する排気ガスに対して攪拌
作用を誘起させる。その結果，この部分を流通する排気
ガスは適宜混合され，その濃度分布がほぼ均一化され
る。In the exhaust sensor mounting structure according to the above configuration, since the bulging portion is provided corresponding to the protruding portion of the sensitive portion, a decrease in the cross-sectional area of exhaust gas flow at that portion is avoided. be able to. And, as described above, the cross section of the bulged portion is shifted on the axis of the exhaust sensor with the upper edge portion of the inner surface in the axial direction of the pipe route along the inner surface of the pipe route. An agitating action is induced on the exhaust gas flowing through the portion. As a result, the exhaust gas flowing through this portion is appropriately mixed, and the concentration distribution is made substantially uniform.
【０００６】[0006]
【実施例】以下添付図面を参照して，本考案を具体化し
た実施例につき説明し，本考案の理解に供する。尚，以
下の実施例は，本考案を具体化した一例であって，本考
案の技術的範囲を限定する性格のものではない。ここ
に，図１は本考案の一実施例に係る排気センサの取付構
造を示すものであって，（Ａ）は要部正面図，（Ｂ）は
（Ａ）におけるＡ−Ａ´矢視断面図である。この実施例
に係る取付構造では，図１に示す如く，図外の排気マニ
ホールドに繋がる集合管１上の適宜部位に，排気センサ
２が配備されている。上記排気センサ２の先端部分に設
けられた感応部２a は，上記集合管１の内部に突出さ
れ，その部分に対応して上記集合管１には断面が略円形
状の膨出部３が形成されている。上記膨出部３は，上記
集合管１の軸芯１b 方向に係る内面上縁部分３a が該集
合管１の内面１a に沿わされ，上記排気センサ２の軸芯
２b 上で下方へずらされている。上記構成とすることに
より，排気センサ２の感応部２a に対して，集合管１と
膨出部３との間における排気ガスの流通部分が断面視で
非対称形状となり，この部分を通過する排気ガスに対し
て適度の混合作用を生じる。これは，同図（Ｂ）におけ
るＢ部分，Ｃ部分，Ｄ部分等において排気ガスの流通に
係る速度分布が異なり，それによる攪拌が進むためであ
る。本実施例に係る排気センサ２の取付構造は上記した
ように構成されているため，集合管１内への感応部２a
の突出による排気ガスの流通断面積が減少するのを回避
することができると共に，その部分において，上記排気
ガスを適宜混合してその濃度分布をほぼ均一な状態とな
すことができ，精度の良い検出結果を得ることができ
る。なお，本考案に係る取付構造においては，膨出部３
を設ける位置は，上記実施例のように集合管１に限定さ
れることはなく，該集合管１の下流側に接続される排気
管等に設けてもよいことはいうまでもない。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; It should be noted that the following embodiment is an example that embodies the present invention and does not limit the technical scope of the present invention. 1A and 1B show a mounting structure of an exhaust sensor according to an embodiment of the present invention, wherein FIG. 1A is a front view of a main part, and FIG. 1B is a cross-sectional view taken along line AA ′ in FIG. FIG. In the mounting structure according to this embodiment, as shown in FIG. 1, an exhaust sensor 2 is provided at an appropriate position on a collecting pipe 1 connected to an exhaust manifold (not shown). A sensitive portion 2a provided at the tip of the exhaust sensor 2 projects into the collecting pipe 1. A bulging portion 3 having a substantially circular cross section is formed in the collecting pipe 1 corresponding to that portion. Is formed. The bulging portion 3 has an upper surface upper edge portion 3 a in the direction of the axis 1 b of the collecting pipe 1 along the inner surface 1 a of the collecting pipe 1, and a lower portion on the axis 2 b of the exhaust sensor 2. Has been staggered. With the above configuration, the exhaust gas flow portion between the collecting pipe 1 and the bulging portion 3 becomes asymmetrical in cross-sectional view with respect to the sensitive portion 2a of the exhaust sensor 2, and the exhaust gas passing through this portion is formed. Produces a moderate mixing effect on the gas. This is because the velocity distributions related to the flow of the exhaust gas are different in the B portion, the C portion, the D portion, and the like in FIG. Since the mounting structure of the exhaust sensor 2 according to the present embodiment is configured as described above, the sensitive portion 2 a
It is possible to avoid a reduction in the flow cross-sectional area of the exhaust gas due to the protrusion of the gas, and at the same time, it is possible to mix the above-mentioned exhaust gas appropriately to make the concentration distribution substantially uniform, thereby achieving high accuracy. A detection result can be obtained. In the mounting structure according to the present invention, the bulge 3
Needless to say, the position at which is provided is not limited to the collecting pipe 1 as in the above embodiment, but may be provided at an exhaust pipe connected downstream of the collecting pipe 1.
【０００７】[0007]
【考案の効果】本考案は，上記したように，内燃機関の
排気マニホールドに繋がる集合管の途中の適宜部位に設
置され，その感応部が該管経路の内部に突出される排気
センサの取付構造において，上記集合管の上記排気セン
サの設置部位に，該集合管の軸芯方向に係る内面上縁部
分を該集合管の内面に沿わせて断面が上記排気センサの
軸芯上にずらされた略円形状の膨出部を形成したことを
特徴とする排気センサの取付構造であるから，排気管内
への感応部の突出による排気ガスの流通断面積の減少を
回避しつつ，該排気ガスを適宜混合してその濃度分布を
ほぼ均一な状態となすことができる。[Effects of the Invention] As described above, the present invention
Placed in the middle of an appropriate site of the collecting pipe leading to the exhaust manifold, the mounting structure of an exhaust sensor that sensitive part is protruded to the inside of the tube path, the installation portion of the exhaust gas sensor of the collecting pipe, the collecting pipe An exhaust sensor characterized in that a substantially circular bulged portion whose cross section is shifted on the axis of the exhaust sensor is formed by making an upper edge portion of an inner surface in an axial direction along the inner surface of the collecting pipe. With the mounting structure described above, the exhaust gas can be appropriately mixed and the concentration distribution can be made substantially uniform while avoiding a decrease in the flow cross-sectional area of the exhaust gas due to the projection of the sensitive portion into the exhaust pipe. .
【図１】 本考案の一実施例に係る排気センサの取付構
造を示すものであって，（Ａ）は要部正面図，（Ｂ）は
（Ａ）におけるＡ−Ａ´矢視断面図。1A and 1B show a mounting structure of an exhaust sensor according to an embodiment of the present invention, wherein FIG. 1A is a front view of a main part, and FIG. 1B is a sectional view taken along the line AA ′ in FIG.
１…集合管 １a …内面 １b …軸芯 ２…排気センサ ２a …感応部 ２b …軸芯 ３…膨出部 ３a …内面上縁部分1 ... collector pipe 1 a ... inner surface 1 b ... axial center 2 ... exhaust sensor 2 a ... sensitive part 2 b ... axial center 3 ... bulge portion 3 a ... inner surface upper portion
Claims (1)
合管の途中の適宜部位に設置され，その感応部が該管経
路の内部に突出される排気センサの取付構造において， 上記集合管の上記排気センサの設置部位に，該集合管の
軸芯方向に係る内面上縁部分を該集合管の内面に沿わせ
て断面が上記排気センサの軸芯上にずらされた略円形状
の膨出部を形成したことを特徴とする排気センサの取付
構造。1. A collector connected to an exhaust manifold of an internal combustion engine.
In an exhaust sensor mounting structure, which is installed at an appropriate position in the middle of a joint pipe and whose sensitive part protrudes into the inside of the pipe path, the installation position of the exhaust sensor of the collecting pipe is set in the axial direction of the collecting pipe. A mounting structure for an exhaust sensor, wherein a substantially circular bulged portion whose cross section is shifted on the axis of the exhaust sensor is formed along the upper edge portion of the inner surface according to the inner surface of the collecting pipe .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1992072307U JP2566301Y2 (en) | 1992-10-16 | 1992-10-16 | Exhaust sensor mounting structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1992072307U JP2566301Y2 (en) | 1992-10-16 | 1992-10-16 | Exhaust sensor mounting structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0635959U JPH0635959U (en) | 1994-05-13 |
| JP2566301Y2 true JP2566301Y2 (en) | 1998-03-25 |
Family
ID=13485487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1992072307U Expired - Lifetime JP2566301Y2 (en) | 1992-10-16 | 1992-10-16 | Exhaust sensor mounting structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2566301Y2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6320809U (en) * | 1986-07-25 | 1988-02-10 |
-
1992
- 1992-10-16 JP JP1992072307U patent/JP2566301Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0635959U (en) | 1994-05-13 |
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