JPS63262559A - Oxygen sensor of internal combustion engine - Google Patents
Oxygen sensor of internal combustion engineInfo
- Publication number
- JPS63262559A JPS63262559A JP62095327A JP9532787A JPS63262559A JP S63262559 A JPS63262559 A JP S63262559A JP 62095327 A JP62095327 A JP 62095327A JP 9532787 A JP9532787 A JP 9532787A JP S63262559 A JPS63262559 A JP S63262559A
- Authority
- JP
- Japan
- Prior art keywords
- oxygen sensor
- sensor element
- powder layer
- oxygen
- electrode
- 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.)
- Pending
Links
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 71
- 239000001301 oxygen Substances 0.000 title claims abstract description 71
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 66
- 238000002485 combustion reaction Methods 0.000 title claims description 8
- 239000000843 powder Substances 0.000 claims abstract description 28
- 239000011810 insulating material Substances 0.000 claims abstract description 6
- 239000007784 solid electrolyte Substances 0.000 claims abstract description 6
- 239000004020 conductor Substances 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 3
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 abstract description 10
- 239000000758 substrate Substances 0.000 abstract description 4
- 230000008642 heat stress Effects 0.000 abstract 1
- 238000010030 laminating Methods 0.000 abstract 1
- 239000000919 ceramic Substances 0.000 description 9
- 239000012212 insulator Substances 0.000 description 9
- 239000011521 glass Substances 0.000 description 5
- 230000008646 thermal stress Effects 0.000 description 5
- 230000006378 damage Effects 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は、内燃機関の排気管に装着され該機関に供給さ
れる混合気の空燃比と密接な関係にある排気中の酸素濃
度を測定してその出力信号を空燃比フィードバック制御
のフィードバック信号として利用する内燃機関の酸素セ
ンサに関する。[Detailed Description of the Invention] <Industrial Application Field> The present invention is a method for measuring the oxygen concentration in exhaust gas, which is attached to the exhaust pipe of an internal combustion engine and is closely related to the air-fuel ratio of the air-fuel mixture supplied to the engine. The present invention relates to an oxygen sensor for an internal combustion engine that uses the output signal as a feedback signal for air-fuel ratio feedback control.
〈従来の技術〉
従来の内燃機関の酸素センサとしては、内外電極間に酸
素イオン伝導性固体電解質を介装し、内外電極のそれぞ
れに接触する気体の酸素濃度差により酸素濃度を検出す
る酸素センサ素子を備えたものがある（特開昭５５−１
２５４４８号公報及び実開昭６０−１６３３５４号公報
参照）。<Prior art> Conventional oxygen sensors for internal combustion engines include an oxygen ion conductive solid electrolyte interposed between the inner and outer electrodes, and detects the oxygen concentration based on the difference in the oxygen concentration of the gas that contacts the inner and outer electrodes. There is one equipped with an element (Japanese Patent Application Laid-Open No. 55-1
(See Japanese Utility Model Publication No. 25448 and Japanese Utility Model Application Publication No. 60-163354).
かかる酸素センサ素子５は、第４図に示すように、アル
ミナ等の絶縁材５Ａ上に、絶縁シート５Ｂにより挟持さ
れたヒータ５Ｃと、固体電解質のグリーンシート５Ｄと
、触媒としての作用を併せ持つ白金製の内側電極５Ｅ及
び外側電極５Ｆとの間に介装されたジルコニア等の酸素
イオン伝導性固体電解質製の基板５Ｇと、を順次積層し
て構成される。また、前記グリーンシー）５Ｄには、前
記内側電極５Ｅの端部が収納される開口凹部５ａと、該
開口凹部５ａと大気側とを連通ずる溝５ｂと、が形成さ
れている。As shown in FIG. 4, the oxygen sensor element 5 includes a heater 5C sandwiched between insulating sheets 5B on an insulating material 5A such as alumina, a solid electrolyte green sheet 5D, and a platinum material that also functions as a catalyst. A substrate 5G made of an oxygen ion conductive solid electrolyte such as zirconia is interposed between an inner electrode 5E and an outer electrode 5F, which are made of aluminum, and are successively laminated. Further, the green sea) 5D is formed with an open recess 5a in which the end of the inner electrode 5E is accommodated, and a groove 5b that communicates the open recess 5a with the atmosphere side.
第５図に示すように、酸素センサは、スリット１０ａを
有するプロテクタ１０がその先端側外周に嵌合されたホ
ルダ９を備え、ホルダ９基端側外周にアウタキャップ１
２及びインナキャップＩ４からなるケース１１が嵌合さ
れている。As shown in FIG. 5, the oxygen sensor includes a holder 9 in which a protector 10 having a slit 10a is fitted on the outer periphery of the distal end thereof, and an outer cap 1 on the outer periphery of the proximal end of the holder 9.
2 and an inner cap I4 are fitted together.
そして、酸素センサ素子５は、その略中央部でワッシャ
６、パツキン７及びパツキン７に接触して配設されたガ
ラス粉末とタルク粉末との混合物層８を介してホルダ９
内に保持される一方、その基端部でガラス層１３を介し
てインナキャップ１４内に保持されている。Then, the oxygen sensor element 5 is transferred to a holder 9 through a washer 6, a packing 7, and a mixture layer 8 of glass powder and talc powder, which is disposed in contact with the packing 7, at a substantially central portion thereof.
On the other hand, the proximal end thereof is held within the inner cap 14 via the glass layer 13.
ここで、ガラス層１３は、酸素センサ素子５の基端側の
インナキャップ１４内空間を酸素センサ素子５の先端側
と気密性を保持して分割する一方、リードハーネス１７
又はインナキャップ１４に電気接続されたリードプレー
目６と、酸素センサ素子５の内外電極５Ｅ、５Ｆに接続
された電極端子１５と、の接続部を固定している。なお
、酸素センサ素子５基端例のインナキャップ１４内空間
は、大気に連通されると共に、図示しない連通通路によ
り酸素センサ素子５の溝５ｂと連通している。Here, the glass layer 13 divides the space inside the inner cap 14 on the proximal end side of the oxygen sensor element 5 from the distal end side of the oxygen sensor element 5 while maintaining airtightness, and the lead harness 17
Alternatively, the connecting portion between the lead play eye 6 electrically connected to the inner cap 14 and the electrode terminal 15 connected to the inner and outer electrodes 5E and 5F of the oxygen sensor element 5 is fixed. Note that the inner space of the inner cap 14 at the base end of the oxygen sensor element 5 is communicated with the atmosphere as well as with the groove 5b of the oxygen sensor element 5 through a communication passage (not shown).
なお、１Ｂは、リードプレーｊ・１６とり−ドハーネス
１７との接続部を保護するグロメットであり、１９は、
ガスケットホルダである。In addition, 1B is a grommet that protects the connection part with the lead play j・16 and the lead harness 17, and 19 is a
It is a gasket holder.
〈発明が解決しようとする問題点〉
しかしながら、このような従来の酸素センサにおいては
、外側電極５Ｆを単にインナキャップ１４にアースする
ためのみに、外側電極５Ｆに電極端子１５をスポット溶
接すると共に該電極端子１５をインナキャップ１４にス
ポット溶接するリードプレート１６にスポット溶接して
いるため、部品数及び組付工数が増加してコストを増大
させる一方、電気接続の信軌性が低下するという問題が
生ずる。<Problems to be Solved by the Invention> However, in such a conventional oxygen sensor, in order to simply ground the outer electrode 5F to the inner cap 14, the electrode terminal 15 is spot-welded to the outer electrode 5F and the Since the electrode terminal 15 is spot welded to the lead plate 16 which is spot welded to the inner cap 14, there is a problem that the number of parts and assembly man-hours increase, increasing the cost, and at the same time, the reliability of the electrical connection decreases. arise.
また、酸素センサ素子５の基端部がガラス層１３を介し
てインナキャップ１４に固定的に支持されているため、
酸素センサが機関の排気熱を受けて温度上昇するに伴っ
てガラス層１３が熱膨張して、酸素センサ素子５に熱応
力を生じさせ、酸素センサ素子５が破壊することがあっ
た。Furthermore, since the base end portion of the oxygen sensor element 5 is fixedly supported by the inner cap 14 via the glass layer 13,
As the temperature of the oxygen sensor rises due to exhaust heat from the engine, the glass layer 13 thermally expands, causing thermal stress in the oxygen sensor element 5, which may cause the oxygen sensor element 5 to break.
本発明はこのような従来の技術の問題点に着目してなさ
れたもので、安価で電気接続の信頼性が向上できると共
に、酸素センサ素子への熱応力の負荷が低減できる内燃
機関の酸素センサを提供することを目的とする。The present invention was made by focusing on the problems of the conventional technology, and provides an oxygen sensor for an internal combustion engine that is inexpensive, improves the reliability of electrical connection, and reduces thermal stress load on the oxygen sensor element. The purpose is to provide
〈問題点を解決するための手段〉
このため、酸素センサ素子の先端部側を外部に露出させ
ると共に基端部側を包囲して絶縁材料からなる支持部材
を介してケース部材内に保持する一方、ケース部材内に
位置する酸素センサ素子の外表面に外側電極と導通ずる
リード面を配設し、該リード面を含む酸素センサ素子基
端側の軸方向所定巾全周とケース部材内壁との間に導電
性材料からなる粉体を気密に封入した。<Means for solving the problem> For this reason, the distal end side of the oxygen sensor element is exposed to the outside, and the proximal end side is surrounded and held within the case member via a support member made of an insulating material. A lead surface that conducts with the outer electrode is provided on the outer surface of the oxygen sensor element located in the case member, and a predetermined width in the axial direction on the base end side of the oxygen sensor element including the lead surface is connected to the inner wall of the case member. A powder made of a conductive material was hermetically sealed between the two.
〈作用〉
上記のような構成を採用したので、外側電極とケース部
材との間の電気接続が導電性粉末層を介してなされるた
め、一つの電極端子及びリードプレートの削減が可能と
なり、コストの低減や電気接続の信転性向上が図られる
。<Function> Since the above configuration is adopted, the electrical connection between the outer electrode and the case member is made through the conductive powder layer, which makes it possible to reduce the number of electrode terminals and lead plates, thereby reducing costs. This reduces the amount of noise and improves the reliability of electrical connections.
さらに、酸素センサ素子が酸素センサ素子とケース部材
との間に封入された導電性粉末層によりケース部材内に
保持される。このため、使用時に温度上昇が生じても、
粉体層には粉体粒子間のなじみにより大きな熱膨張が生
することがなく、酸素センサ素子への熱応力の負荷を抑
制でき、酸素センサ素子の破壊が防止される。Further, the oxygen sensor element is held within the case member by a conductive powder layer sealed between the oxygen sensor element and the case member. Therefore, even if the temperature rises during use,
Large thermal expansion does not occur in the powder layer due to compatibility between powder particles, and thermal stress load on the oxygen sensor element can be suppressed, thereby preventing destruction of the oxygen sensor element.
〈実施例〉
以下に、第１図〜第３図に基づいて本発明の一実施例に
ついて説明する。なお、従来例と同様な要素には同一の
符号を付して説明を省略する。<Example> An example of the present invention will be described below based on FIGS. 1 to 3. Note that elements similar to those in the conventional example are designated by the same reference numerals, and description thereof will be omitted.
第２図に示すように、酸素センサ素子２０は、従来と同
様な要素、すなわち絶縁材２ＯＡと、絶縁シート２０Ｂ
と、ヒータ２０Ｃと、グリーンシート２０．Ｄと、内側
電極２０Ｅと、外側電極２０Ｆと、酸素イオン伝導性固
体電解質製の基板２０Ｇと、を順次積層して構成される
。また、グリーンシー１〜２０Ｄには、開口凹部２０ａ
と、溝２０ｂが形成されている。As shown in FIG. 2, the oxygen sensor element 20 includes the same elements as before, namely an insulating material 2OA and an insulating sheet 20B.
, heater 20C, and green sheet 20. D, an inner electrode 20E, an outer electrode 20F, and a substrate 20G made of an oxygen ion conductive solid electrolyte are sequentially laminated. In addition, green seas 1 to 20D have opening recesses 20a.
A groove 20b is formed.
第３図に示すように、酸素センサ素子２０には、その基
端部付近に溝２Ｏｂ内の内側電極２０Ｅに電気接続され
たリード面２０Ｈが露出して設けられる一方、その中間
部に酸素センサ素子２０外面の外側電極２０Ｆに連なっ
て形成されたリード面２０１が設けられている。As shown in FIG. 3, the oxygen sensor element 20 is provided with an exposed lead surface 20H electrically connected to the inner electrode 20E in the groove 2Ob near its base end, while an oxygen sensor A lead surface 201 is provided that is continuous with the outer electrode 20F on the outer surface of the element 20.
第１図に示すように、酸素センサ素子２０の先端部付近
は、たとえばセラミックス製の絶縁碍子２１を介してホ
ルダ９内に支持されている。As shown in FIG. 1, the vicinity of the tip of the oxygen sensor element 20 is supported within a holder 9 via an insulator 21 made of ceramic, for example.
酸素センサ素子２０の中間部は、インナキャップ１４内
に圧入されたタルク粉末層２２により保持されると共に
、タルク粉末層２２に隣接する導電性粉末層２３を介し
て保持されている。The middle portion of the oxygen sensor element 20 is held by a talc powder layer 22 press-fitted into the inner cap 14 and is held via a conductive powder layer 23 adjacent to the talc powder layer 22.
導電性粉末層２３は、たとえば鱗状カーボン等の導電性
材料からなる粉末を、リード面２０１と接触して酸素セ
ンサ素子２０とインナキャンプ１４内壁との間に加圧封
入して形成される。また、導電性粉末層２３は、ホルダ
９及びインナキャップ１４内空間を、酸素センサ素子２
０の先端側と基端側とに気密性を保持して分割している
。The conductive powder layer 23 is formed by pressurizing and sealing powder made of a conductive material such as scaly carbon between the oxygen sensor element 20 and the inner wall of the inner camp 14 in contact with the lead surface 201 . Further, the conductive powder layer 23 connects the space inside the holder 9 and the inner cap 14 to the oxygen sensor element 2.
0 is divided into a distal end side and a proximal end side while maintaining airtightness.
２４は、タルク粉末及び導電性粉末をインナキャップ１
４内に圧入するためのセラミック製絶縁碍子であり、２
５及び２６は、タルク粉末層２２又は導電性粉末層２３
の漏洩防止用パツキンである。24 is the inner cap 1 with talc powder and conductive powder.
It is a ceramic insulator to be press-fitted into 2.
5 and 26 are the talc powder layer 22 or the conductive powder layer 23
This is a gasket to prevent leakage.
酸素センサ素子２０の基端部は、セラミック製絶縁碍子
２７によりインナキャップ１４に支持されている。A base end portion of the oxygen sensor element 20 is supported by the inner cap 14 by a ceramic insulator 27 .
セラミック製絶縁碍子２７には、四部２７ａが形成され
ており、該凹部２７ａ内にハーネス１７の端部に取り付
けられたターミナル１７ａを若干弾性変形して圧入して
、セラミック製絶縁碍子２７内に挿入保持されたリード
面２０Ｈにターミナル１７ａを当接して、内側電極２０
Ｅと図示しない検出器との電気接続を図っている。The ceramic insulator 27 is formed with four parts 27a, and the terminal 17a attached to the end of the harness 17 is press-fitted into the recess 27a with slight elastic deformation, and inserted into the ceramic insulator 27. The terminal 17a is brought into contact with the held lead surface 20H, and the inner electrode 20
Electrical connection is made between E and a detector (not shown).
ターミナル１７ａとハーネス１７との境界部は、セラミ
ック製絶縁碍子２８によりインナキャップ１４内に支持
されている。なお２９は、酸素センサ素子２０内に内挿
されたヒータ２０Ｃに電気接続されるハーネスである。The boundary between the terminal 17a and the harness 17 is supported within the inner cap 14 by a ceramic insulator 28. Note that 29 is a harness electrically connected to the heater 20C inserted within the oxygen sensor element 20.
ここで、ホルダ９及びインナキャップ１４は本発明のケ
ース部材を構成し、セラミック製絶縁碍子２１、２４．
２７並びにタルク粉末層２２及びパツキン２５゜２６は
、本発明の絶縁材料からなる支持部材を構成する。Here, the holder 9 and the inner cap 14 constitute a case member of the present invention, and the ceramic insulators 21, 24 .
27, the talc powder layer 22, and the packing 25 and 26 constitute a support member made of the insulating material of the present invention.
なお、本実施例の酸素センサは、酸素センサ素子２０先
端部を図示しない機関の排気通路内に配設し、ホルダ９
を排気通路に接地して取り付けて使用する。In addition, in the oxygen sensor of this embodiment, the tip of the oxygen sensor element 20 is arranged in the exhaust passage of an engine (not shown), and the holder 9
Use by grounding and installing in the exhaust passage.
かかる構成によれば、導電性粉末層２３により酸素セン
サ素子２０の外側電極２０Ｆとインナキャップ１４とを
電気接続できる。このため、端子電極１５やリードプレ
ート１６が不要となり、信頼性の高い電気接続構造とな
る共に、コストが低減できる。According to this configuration, the outer electrode 20F of the oxygen sensor element 20 and the inner cap 14 can be electrically connected by the conductive powder layer 23. Therefore, the terminal electrode 15 and the lead plate 16 are not required, resulting in a highly reliable electrical connection structure and cost reduction.
一方、酸素センサ素子２０がタルク粉末層２２及び導電
性粉末層２３により保持されているので、酸素センサの
温度が上昇しても、粉体粒子間のなじみにより粉体層に
は大きな熱膨張が生ずることがない。したがって、酸素
センザ素子２０への熱応力を負荷が低減され、温度上昇
に伴う酸素センサ素子２０の破壊が防止できる。On the other hand, since the oxygen sensor element 20 is held by the talc powder layer 22 and the conductive powder layer 23, even if the temperature of the oxygen sensor increases, the powder layer will undergo large thermal expansion due to the compatibility between the powder particles. It never occurs. Therefore, the thermal stress load on the oxygen sensor element 20 is reduced, and destruction of the oxygen sensor element 20 due to temperature rise can be prevented.
また、外部に設けられた検出器と内側電極２０Ｂとの電
気接続をターミナル１７ａとリード面２０Ｈとの弾性的
な当接で行うようにしたため、簡単な構造で確実な電気
接続が図れる。Further, since the electrical connection between the externally provided detector and the inner electrode 20B is made by elastic contact between the terminal 17a and the lead surface 20H, reliable electrical connection can be achieved with a simple structure.
また、セラミック製絶縁碍子２１及び２７により、酸素
センサ素子２０を両端で支持するようにしたので、その
中間にタルク粉末層２２及び導電性粉末層２３が介装さ
れていても、酸素センサ素子２ｏを安定してホルダ９及
びインナキャップ１４内に保持できる。Moreover, since the oxygen sensor element 20 is supported at both ends by the ceramic insulators 21 and 27, even if the talc powder layer 22 and the conductive powder layer 23 are interposed between them, the oxygen sensor element 2o can be stably held within the holder 9 and the inner cap 14.
なお、実施例では、内側電極２０Ｂと外部検出器との間
の電気接続を、リード面２０Ｈとターミナル１７ａとの
接触によったが、従来と同様な電極端子１５及びリード
プレート１６を介してハーネス１７に接続するものであ
ってもよい。In the embodiment, the electrical connection between the inner electrode 20B and the external detector was made through contact between the lead surface 20H and the terminal 17a, but the electrical connection between the inner electrode 20B and the external detector was made through contact between the lead surface 20H and the terminal 17a. 17 may also be used.
また、実施例では、導電性粉末層２３に気密機能を併せ
持たせたが、導電性粉末層２３を補完する他の気密構造
を設けたものであってもよい。Furthermore, in the embodiment, the conductive powder layer 23 also has an airtight function, but other airtight structures that complement the conductive powder layer 23 may be provided.
〈発明の効果〉
以」二説明してきたように、本発明によれば、酸素セン
サ素子のケース部材内に位置する外表面に外側電極と導
通するリード面を配設し、該リード面を含む酸素センサ
素子基端側の軸方向所定巾全周とケース部材内壁との間
に導電性材料からなる粉体を気密に封入したので、コス
トの低減や電気接続の信頼性向上を図ることができると
共に、酸素センサ素子への熱応力の負荷を抑制してこの
破壊を防止することができる。<Effects of the Invention> As described above, according to the present invention, a lead surface that is electrically connected to the outer electrode is disposed on the outer surface of the oxygen sensor element located inside the case member. Powder made of conductive material is hermetically sealed between the entire circumference of the base end of the oxygen sensor element over a predetermined width in the axial direction and the inner wall of the case member, reducing costs and improving the reliability of electrical connections. At the same time, it is possible to suppress the load of thermal stress on the oxygen sensor element and prevent this destruction.
第１図は本発明の一実施例の断面図、第２図は同上の酸
素センサ素子の積層構造を示す図、第３図は同上の酸５
素センサ素子の斜視図、第４図は従来の酸素センサ素子
の積層構造を示す図、第５図は同上の酸素センサの断面
図である。
９・・・ホルダ １４・・・インナキャップ ２０
・・・酸素センサ素子 ２０Ｂ・・・内側電極 ２
０Ｆ・・・外側電極 ２０Ｇ・・・基板 ２０Ｈ，
２０Ｉ・・・リード面２１、２４．２７・・・セラミッ
ク製絶縁碍子 ２２・・・タルり粉末層 ２３・・
・導電性粉末層 ２５．２６・・・パツキン
特 許 出 願 人 日本電子機器株式会社代 理 人
弁理士 笹 島 富二雄第１図
第２図
第３図
１Ｊｌ
第４図
１１開昭６３−２Ｇ２５５９（５）
第５図FIG. 1 is a cross-sectional view of one embodiment of the present invention, FIG. 2 is a diagram showing the laminated structure of the oxygen sensor element as described above, and FIG.
FIG. 4 is a perspective view of the oxygen sensor element, FIG. 4 is a diagram showing the laminated structure of the conventional oxygen sensor element, and FIG. 5 is a cross-sectional view of the same oxygen sensor. 9...Holder 14...Inner cap 20
...Oxygen sensor element 20B...Inner electrode 2
0F...Outer electrode 20G...Substrate 20H,
20I... Lead surface 21, 24. 27... Ceramic insulator 22... Smooth powder layer 23...
・Conductive powder layer 25.26...Patsukin patent Applicant: Japan Electronics Co., Ltd. Agent: Patent attorney Fujio Sasashima 5) Figure 5
Claims (1)
解質を介装して該内外電極のそれぞれに接触する気体の
酸素濃度差により酸素濃度を検出する酸素センサ素子を
、その先端部側を外部に露出させると共に基端部側を包
囲して絶縁材料からなる支持部材を介してケース部材内
に保持する一方、前記ケース部材を内燃機関の排気通路
に接地して取り付け前記酸素センサ素子の先端部を排気
通路内に臨ませて配設するようにした内燃機関の酸素セ
ンサにおいて、前記ケース部材内に位置する酸素センサ
素子の外表面に前記外側電極と導通するリード面を配設
する一方、該リード面を含む酸素センサ素子基端側の軸
方向所定巾全周と前記ケース部材内壁との間に導電性材
料からなる粉体を気密に封入したことを特徴とする内燃
機関の酸素センサ。An oxygen ion conductive solid electrolyte is interposed between the electrodes disposed inside and outside the sensor, and an oxygen sensor element detects the oxygen concentration based on the difference in the oxygen concentration of the gas that contacts the inner and outer electrodes. The distal end of the oxygen sensor element is exposed to the outside, and the proximal end side is surrounded and held in a case member via a support member made of an insulating material, and the case member is grounded and attached to an exhaust passage of an internal combustion engine. In the oxygen sensor for an internal combustion engine, the oxygen sensor element is disposed so as to face an exhaust passage, and a lead surface electrically connected to the outer electrode is disposed on the outer surface of the oxygen sensor element located within the case member; An oxygen sensor for an internal combustion engine, characterized in that powder made of a conductive material is hermetically sealed between the entire periphery of a predetermined width in the axial direction on the base end side of the oxygen sensor element including the lead surface and the inner wall of the case member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62095327A JPS63262559A (en) | 1987-04-20 | 1987-04-20 | Oxygen sensor of internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62095327A JPS63262559A (en) | 1987-04-20 | 1987-04-20 | Oxygen sensor of internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63262559A true JPS63262559A (en) | 1988-10-28 |
Family
ID=14134635
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62095327A Pending JPS63262559A (en) | 1987-04-20 | 1987-04-20 | Oxygen sensor of internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63262559A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0443005A (en) * | 1990-06-08 | 1992-02-13 | Japan Electron Control Syst Co Ltd | Sheet laminating device for oxygen sensor |
| JPH10508384A (en) * | 1995-08-30 | 1998-08-18 | ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング | Seal for sensor element of gas sensor |
-
1987
- 1987-04-20 JP JP62095327A patent/JPS63262559A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0443005A (en) * | 1990-06-08 | 1992-02-13 | Japan Electron Control Syst Co Ltd | Sheet laminating device for oxygen sensor |
| JP2525934B2 (en) * | 1990-06-08 | 1996-08-21 | 株式会社ユニシアジェックス | Plate stacking device for oxygen sensor |
| JPH10508384A (en) * | 1995-08-30 | 1998-08-18 | ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング | Seal for sensor element of gas sensor |
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