JPH0131962Y2 - - Google Patents
Info
- Publication number
- JPH0131962Y2 JPH0131962Y2 JP6710981U JP6710981U JPH0131962Y2 JP H0131962 Y2 JPH0131962 Y2 JP H0131962Y2 JP 6710981 U JP6710981 U JP 6710981U JP 6710981 U JP6710981 U JP 6710981U JP H0131962 Y2 JPH0131962 Y2 JP H0131962Y2
- Authority
- JP
- Japan
- Prior art keywords
- ceramic insulator
- oxygen sensor
- sensor
- tip
- oxygen
- 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
- 239000001301 oxygen Substances 0.000 claims description 35
- 229910052760 oxygen Inorganic materials 0.000 claims description 35
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 33
- 239000012212 insulator Substances 0.000 claims description 30
- 239000000919 ceramic Substances 0.000 claims description 25
- 238000000605 extraction Methods 0.000 claims description 19
- 239000007784 solid electrolyte Substances 0.000 claims description 9
- 230000000052 comparative effect Effects 0.000 description 11
- 239000007789 gas Substances 0.000 description 10
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 8
- 239000000853 adhesive Substances 0.000 description 8
- 230000001070 adhesive effect Effects 0.000 description 8
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 8
- 230000001681 protective effect Effects 0.000 description 8
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 7
- 229910004298 SiO 2 Inorganic materials 0.000 description 5
- 238000007789 sealing Methods 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- -1 air Chemical compound 0.000 description 3
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 description 3
- 229910052697 platinum Inorganic materials 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N Acrylic acid Chemical compound OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 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
- 239000010425 asbestos Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000005524 ceramic coating Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 229910052839 forsterite Inorganic materials 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 229910001026 inconel Inorganic materials 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 150000002926 oxygen Chemical class 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 239000012945 sealing adhesive Substances 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Landscapes
- Measuring Oxygen Concentration In Cells (AREA)
Description
【考案の詳細な説明】
本考案は低温作動性の向上と出力取り出しを容
易にした酸素センサに関するものである。[Detailed Description of the Invention] The present invention relates to an oxygen sensor that has improved low temperature operability and facilitates output output.
酸素センサは、これまで種々の構造のものが考
えられているが、例えば酸化イツトリウム等で安
定化されたジルコニア等の酸素イオン導伝性固体
電解質を用いて一端が閉止された筒状容器を形成
し、この容器の外側表面に白金系からなる内外電
極を形成せしめ、容器内部には標準物質として例
えば空気のように一定の酸素を含む気体を入れ、
この固体電解質容器の内外電極にそれぞれ接触す
る内部標準物質と被測定ガスとの平衡酸素分圧比
を電位差に変換し、以つて被測定ガスの酸素濃度
を検出する構成のものが知られている。この酸素
センサは、自動車においては、エンジンの空燃比
制御機構にフイードバツクされる排ガス中の酸素
濃度を検出する役割を果しており、三元触媒を用
いた排ガス浄化システムには欠くことのできない
ものである。 Various structures have been considered for oxygen sensors, but for example, oxygen ion-conducting solid electrolytes such as zirconia stabilized with yttrium oxide are used to form a cylindrical container with one end closed. Then, inner and outer electrodes made of platinum are formed on the outer surface of this container, and a gas containing a certain amount of oxygen, such as air, is placed inside the container as a standard substance.
A structure is known in which the equilibrium oxygen partial pressure ratio between the internal standard substance and the gas to be measured, which are in contact with the inner and outer electrodes of the solid electrolyte container, respectively, is converted into a potential difference, thereby detecting the oxygen concentration of the gas to be measured. In automobiles, this oxygen sensor plays the role of detecting the oxygen concentration in exhaust gas, which is fed back to the engine's air-fuel ratio control mechanism, and is indispensable for exhaust gas purification systems that use three-way catalysts. .
従来の酸素センサは、内部標準物質として空気
を用いた場合、通常第１図に示すような構造より
なる。すなわち、素子ａは酸素イオン導伝性固体
電解質で形成された容器状本体a1の内側及び外側
面に内外電極a2，a3を形成したもので、内側電極
a2の電位は容器状本体a1の開口部に挿入されたス
テムｅ、バネｋを介して電位取り出し用端子ｊか
ら取り出され、外側電極a3の電位はハウジングｂ
に伝達され外部へ取り出される。 A conventional oxygen sensor usually has a structure as shown in FIG. 1 when air is used as an internal standard substance. That is, element a has inner and outer electrodes a 2 and a 3 formed on the inner and outer surfaces of a container-shaped body a 1 made of an oxygen ion-conducting solid electrolyte.
The potential of a2 is taken out from the potential extraction terminal j via the stem e and spring k inserted into the opening of the container-like body a1 , and the potential of the outer electrode a3 is taken out from the housing b.
is transmitted to and taken out to the outside.
しかしながら上記第１図に示す構成の酸素セン
サは下記のような欠点を有している。 However, the oxygen sensor having the configuration shown in FIG. 1 has the following drawbacks.
１ 被測定ガスと内部標準ガスとが混合すること
なくかつ被測定ガス中に一定の突出量を確保す
るためには素子を大きくしなければならず、ま
た上端部が外気に接触するため低温状態から素
子が作動しはじめる最低作動温度に達するまで
に時間がかかり同時に特に被測定ガス温が低い
場合には最低作動温度に達しがたい。1. In order to ensure that the gas to be measured and the internal standard gas do not mix and to ensure a certain amount of protrusion into the gas to be measured, the element must be made large, and the top end is in contact with the outside air, so the temperature is low. It takes time to reach the minimum operating temperature at which the element starts operating, and at the same time, it is difficult to reach the minimum operating temperature especially when the temperature of the gas to be measured is low.
２ 自動車の排気管に取付けて走行する際、セン
サ上半の露出部に水がかかる場合があり、水に
よる温度降下がハウジング及びシーリングを介
して素子に速やかに伝達されるため、かかる事
態が高温状態にある時に発生すれば熱衝撃に弱
いジルコニアからなる素子は破壊される。2 When the sensor is attached to the exhaust pipe of a car and driven, water may splash onto the exposed part of the upper half of the sensor, and the drop in temperature caused by the water is quickly transmitted to the element via the housing and sealing, so this situation can cause high temperatures. If this occurs in the current state, the element made of zirconia, which is vulnerable to thermal shock, will be destroyed.
３ ハウジングの上端部をかしめる際、前記酸素
センサの構造ではハウジング上端部にかかるか
しめ力が素子に直接かかることになり、細心の
注意をはらつて作業を実施しないと素子が破壊
される。3. When caulking the upper end of the housing, the structure of the oxygen sensor means that the caulking force applied to the upper end of the housing will be applied directly to the element, and the element will be destroyed unless the work is carried out with extreme caution.
４ 部品点数が多く構造が複雑であるためかしめ
などの組付作業時に非常に手間がかかり、また
素子が大きいためにコストが高くなり生産性に
とぼしいものになつている。4. Since the number of parts is large and the structure is complex, assembly work such as caulking is extremely time-consuming, and the large size of the elements increases costs and reduces productivity.
上記の欠点を解決するために改良型センサとし
て第２図に示すような構造のものが提案されてい
る。 In order to solve the above-mentioned drawbacks, an improved sensor having a structure as shown in FIG. 2 has been proposed.
この改良型酸素センサは、従来の酸素センサと
同様に酸化イツトリウム等で安定化されたジルコ
ニア固体電解質を用いて素子を形成するが、素子
は被測定ガスと接するのに必要な大きさに小型化
し、この素子をセラミツクインシユレーター先端
に密着固定してなるものである。その一例を第２
図及び第３図に従つて説明する。素子１は、一端
が閉止された筒状体で開口部近傍の外径が先端部
外径より大きくした多段の肩部１ｂに形成された
容器本体１ａの内外表面に内側電極１ｃ、外側電
極１ｄが形成され、更に外側電極１ｄ上には多孔
質コーテイング層１ｅが形成されてなる（第２図
ａ参照）。このように形成された素子１を、第３
図に示すように、先端内部に素子１の肩部１ｂの
形状に対応させて固定部２ａを設けた円筒状の外
側セラミツクインシユレーター２内に外側電極用
電位取り出し金具４とともに挿入し、固定部２ａ
にて封着処理する。次に、この外側セラミツクイ
ンシユレーター２内に貫通孔３ａ、素子接触部３
ｂ、内側電極用リード線５、溝３ｃを有している
内側セラミツクインシユレーター３を挿入し、素
子１の開口部に前記素子接触部３ｂが当接するよ
うにして組付け、最後に外側セラミツクインシユ
レーター２の外周に設けられた係止部２ｂにてハ
ウジング６内にセツトして改良型酸素センサを得
る。なお、図中、７は素子保護カバー、８は内外
セラミツクインシユレーター２，３の密着保持性
向上のために充填される無機接着剤、８ａは無機
接着剤からなるシール材、８ｂはハウジング６と
保護カバー９との溶接加工、９は保護カバー、９
ａは空気導入用スリツト、１０はクツシヨン材を
示す。 Like conventional oxygen sensors, this improved oxygen sensor uses a zirconia solid electrolyte stabilized with yttrium oxide to form an element, but the element is miniaturized to the size necessary for contact with the gas being measured. , this element is tightly fixed to the tip of a ceramic insulator. An example of this is shown in the second
This will be explained with reference to the figures and FIG. The element 1 is a cylindrical body with one end closed, and an inner electrode 1c and an outer electrode 1d are formed on the inner and outer surfaces of a container body 1a formed in a multi-stage shoulder portion 1b in which the outer diameter near the opening is larger than the outer diameter of the tip. A porous coating layer 1e is further formed on the outer electrode 1d (see FIG. 2a). The element 1 formed in this way is
As shown in the figure, it is inserted into a cylindrical outer ceramic insulator 2, which has a fixing part 2a corresponding to the shape of the shoulder part 1b of the element 1 inside the tip, together with the outer electrode potential extraction fitting 4, and fixed. Part 2a
Sealing process is performed. Next, a through hole 3a is provided in this outer ceramic insulator 2, and an element contact portion 3 is provided inside the outer ceramic insulator 2.
b. Insert the lead wire 5 for the inner electrode and the inner ceramic insulator 3 having the groove 3c, and assemble it so that the element contact part 3b is in contact with the opening of the element 1. Finally, insert the outer ceramic The insulator 2 is set in the housing 6 using a locking portion 2b provided on the outer periphery of the insulator 2 to obtain an improved oxygen sensor. In the figure, 7 is an element protection cover, 8 is an inorganic adhesive filled to improve the adhesion between the inner and outer ceramic insulators 2 and 3, 8a is a sealing material made of inorganic adhesive, and 8b is a housing 6. and the protective cover 9 are welded, 9 is the protective cover, 9
A indicates a slit for introducing air, and 10 indicates a cushion material.
このような基本構成を有する改良型酸素センサ
は、１）素子の小型化、２）素子割れの防止、
３）作業性の向上、４）簡略化という利点を有し
ているが、なお次の様な欠点を有している。すな
わち、１）外側セラミツクインシユレーター２に
挿入する内側セラミツクインシユレーター３の形
状が複雑である。２）リード線５は接触突出部３
ｂにおいて溶接等により導電性を確保している
が、素子開口部との接触不良あるいは溶接不良に
よる脱着等によりセンサとしての機能を発揮しな
いことがある。更に、３）内側インシユレーター
３の形状が外側インシユレーター２内全体を閉塞
する大きさであるために熱伝導性が良くなり素子
温が不安定となる。また更に、４）充填剤、接着
剤として無機接着剤８を使用しているため、この
無機接着剤が素子の内部電極に浸入しセンサ特性
を悪化させる原因となつている。など多くの解決
すべき問題を有している。 The improved oxygen sensor with this basic configuration has the following features: 1) miniaturization of the element, 2) prevention of element cracking,
Although it has the advantages of 3) improved workability and 4) simplification, it still has the following drawbacks. That is, 1) the shape of the inner ceramic insulator 3 inserted into the outer ceramic insulator 2 is complicated; 2) The lead wire 5 is connected to the contact protrusion 3
Although conductivity is secured by welding or the like in b, the function as a sensor may not be exhibited due to poor contact with the element opening or detachment due to poor welding. Furthermore, 3) since the shape of the inner insulator 3 is large enough to close the entire inside of the outer insulator 2, thermal conductivity is improved and the element temperature becomes unstable. Furthermore, 4) Since the inorganic adhesive 8 is used as a filler and adhesive, this inorganic adhesive penetrates into the internal electrodes of the element and causes deterioration of sensor characteristics. There are many problems that need to be solved.
本考案は、上記問題を解決するためのもので、
使用中において断線、接触不良等のおそれがな
く、加えて低温作動性を向上せしめた改良型酸素
センサを提供せんとするものである。 This invention is intended to solve the above problems.
It is an object of the present invention to provide an improved oxygen sensor that is free from the risk of wire breakage, poor contact, etc. during use, and has improved low-temperature operability.
本考案酸素センサは、酸素イオン導伝性固体電
解質からなる容器状本体の内側及び外側表面にそ
れぞれ電極を形成してなる素子を円筒状セラミツ
クインシユレーター先端に密着固定してなる改良
型酸素センサにおいて、該セラミツクインシユレ
ーター内に軸方向の途中に膨出部を有する円筒状
の内側電極用電位取り出し金具を、該金具の先端
が素子開口部の内側電極に当接するように挿入、
位置せしめ、該セラミツクインシユレーターに位
置決め用パイプを素子固定側と反対側より嵌入し
前記膨出部に係止せしめることによつてセラミツ
クインシユレーター先端部内に空間を設けたこと
を特徴とする。 The oxygen sensor of the present invention is an improved oxygen sensor in which an element is formed by forming electrodes on the inner and outer surfaces of a container-shaped body made of an oxygen ion-conducting solid electrolyte, and is closely fixed to the tip of a cylindrical ceramic insulator. Insert a cylindrical inner electrode potential extraction fitting having a bulge in the middle in the axial direction into the ceramic insulator so that the tip of the fitting comes into contact with the inner electrode of the element opening,
A space is created in the tip of the ceramic insulator by inserting a positioning pipe into the ceramic insulator from the side opposite to the element fixing side and locking it in the bulge. .
以下、本考案を第４図及び第５図に従つて説明
する。 The present invention will be explained below with reference to FIGS. 4 and 5.
第４図は、本考案センサの組立て順序を示した
分解斜視図で、第５図は本考案センサの断面図を
示す。 FIG. 4 is an exploded perspective view showing the assembly sequence of the sensor of the present invention, and FIG. 5 is a sectional view of the sensor of the present invention.
本考案において素子１は従来の改良型酸素セン
サと同様に、酸化イツトリウム等で安定化された
ジルコニア等の酸素イオン導伝性の固体電解質で
同様な形状に形成される。なお、素子１において
肩部１ｂは外側電極電位取り出し部１ｇ，１ｈ、
封着部１ｉよりなり、容器状本体１ａの内外表面
には白金系合金薄膜層からなる内側電極１ｃ、外
側電極１ｄが形成されている。１ｅは多孔質セラ
ミツクコーテイング層を示す。 In the present invention, the element 1 is formed in the same shape as the conventional improved oxygen sensor using an oxygen ion conductive solid electrolyte such as zirconia stabilized with yttrium oxide or the like. In addition, in the element 1, the shoulder portion 1b has outer electrode potential extraction portions 1g, 1h,
An inner electrode 1c and an outer electrode 1d made of a platinum-based alloy thin film layer are formed on the inner and outer surfaces of the container-shaped main body 1a. 1e indicates a porous ceramic coating layer.
本考案の場合、外側電極用電位取り出し金具
４′は好ましくは第４図に示したようにリード部
が板状となつているものを使用するとよい。ま
た、本考案では、内側電極用電位取り出し金具
５′として、第４図に示したような先端にテーパ
部５′ａを有し膨出部５′ｂ、空気導入孔５′ｃを
有する円筒状の金具を使用する。内側及び外側電
極用取り出し金具のいずれも、インコネル例えば
インコ600、インコ601等あるいはステンレススチ
ール例えばSUS310，SUS304，SUS340等の材質
よりプレス成形、引き抜き加工などによつて作ら
れる。 In the case of the present invention, the potential extraction metal fitting 4' for the outer electrode preferably has a plate-shaped lead portion as shown in FIG. 4. In addition, in the present invention, as the potential extraction fitting 5' for the inner electrode, a cylindrical member having a tapered part 5'a at the tip, a bulging part 5'b, and an air introduction hole 5'c as shown in FIG. Use shaped metal fittings. Both the inner and outer electrode extraction fittings are made of Inconel, such as Inco 600, Inco 601, etc., or stainless steel, such as SUS310, SUS304, SUS340, etc., by press molding, drawing, etc.
本考案酸素センサは、第４図に示すように、素
子１を外側電極用取り出し金具４′内に挿入し、
これらを更にセラミツクインシユレーター２′内
に挿入し、素子１の先端部がインシユレーター
２′から突出しているようにして固定し、その後
内側電極用取り出し金具５′を挿入し、位置決め
用パイプ３′を嵌挿する。このようにして得た接
合体をハウジング６′に組付けて完成する。 As shown in FIG. 4, the oxygen sensor of the present invention inserts the element 1 into the outer electrode extraction fitting 4',
These are further inserted into the ceramic insulator 2' and fixed so that the tip of the element 1 protrudes from the insulator 2', and then the inner electrode extraction fitting 5' is inserted, and the positioning pipe is Insert 3'. The thus obtained joined body is assembled into the housing 6' to complete the assembly.
上記においてセラミツクインシユレーター２′
は、従来の外側セラミツクインシユレーターと同
様な形状としてよく、またセラミツクインシユレ
ーター２′及び位置決め用パイプ３′ともに、固体
電解質に比べ強度、耐熱衝撃性に優れ金属材料に
比べ熱伝導率の低い材料、例えばAl2O3，MgO−
Al2O3（スピネル）、フオルステライト、ムライト
等の絶縁材料からなる。なお、セラミツクインシ
ユレーター２′において、２′ａは素子１を固定す
るための固定部、２′ｂはハウジング２′の係止
部、２′ｃは貫通孔を示し、位置決め用パイプ
３′において３′ａは内側電極用リード金具５′の
膨出部５′ｂに係止するための係止部、３′ｂは貫
通孔を示す。 In the above, ceramic insulator 2'
The ceramic insulator 2' and positioning pipe 3' both have superior strength and thermal shock resistance compared to solid electrolytes, and lower thermal conductivity than metal materials. Low material, e.g. Al 2 O 3 , MgO−
Made of insulating materials such as Al 2 O 3 (spinel), forsterite, and mullite. In the ceramic insulator 2', 2'a is a fixing part for fixing the element 1, 2'b is a locking part of the housing 2', and 2'c is a through hole. 3'a is a locking portion for locking to the bulging portion 5'b of the inner electrode lead fitting 5', and 3'b is a through hole.
上記、組付けにあたり、素子１と外側電極用取
り出し金具４′とは、素子１の封着部１ｉに接着
剤８′ａを塗布して封着し、取り出し金具４′を電
位取り出し部１ｇ，１ｈの間には白金（Pt）ペ
ーストを塗布して導通性を向上させた。なお、
Ptペーストは内側電極用取り出し金具５′の先端
テーパー部５′ａにも塗布して素子開口部１ｆに
挿入して導通性を確保した。 In the above-mentioned assembly, the element 1 and the outer electrode extraction fitting 4' are sealed by applying adhesive 8'a to the sealing part 1i of the element 1, and the extraction fitting 4' is sealed to the potential extraction part 1g, Platinum (Pt) paste was applied for 1 hour to improve conductivity. In addition,
The Pt paste was also applied to the tapered tip portion 5'a of the inner electrode extraction fitting 5' and inserted into the element opening 1f to ensure electrical conductivity.
封着用接着剤としては、Ca−Al2O3−MgO系、
SiO2−CaO−Al2O3系、SiO2−CaO−Al2O3−
MgO系、SiO2−Al2O3−Na系、SiO2−MgO系、
TiO2−BaO系、Al2O3−SiO2−Li系等のガラス
剤が挙げられる。これらの接着剤は、例えば
Al2O3−SiO2−Na系の場合、1100℃×30分間還
元雰囲気で加熱することにより封着する。 As the sealing adhesive, Ca-Al 2 O 3 -MgO type,
SiO 2 −CaO−Al 2 O 3 system, SiO 2 −CaO−Al 2 O 3 −
MgO system, SiO 2 -Al 2 O 3 -Na system, SiO 2 -MgO system,
Examples include glass agents such as TiO2 -BaO type and Al2O3 - SiO2 -Li type. These adhesives are e.g.
In the case of Al 2 O 3 −SiO 2 −Na system, sealing is performed by heating in a reducing atmosphere at 1100° C. for 30 minutes.
セラミツクインシユレーター２′と位置決め用
パイプ３′との間にも、内側電極用取り出し金具
５′の固定のために無機接着剤８′、例えばアロン
セラミツクＤ、スミセラム（商品名）等を充填し
た。 Also between the ceramic insulator 2' and the positioning pipe 3', an inorganic adhesive 8' such as Aron Ceramic D, Sumiceram (trade name), etc. was filled in order to fix the inner electrode extraction fitting 5'. .
ハウジング６′への接合体のセツトは、パツキ
ング１１を介してセラミツクインシユレーター
２′の係止部２′ｂで行い、この係止部２′ｂ上に
タルク、アスベスト、パイロフイライト、グラフ
アイト等の耐熱性材料からなるクツシヨン材１０
を充填し、その上から空気導入用スリツト９ａを
有する保護カバー９を取付ける。次に、保護カバ
ー９の位置決めのために、例えばステンレススチ
ール、銅などからなるリング１２を載置し、かか
る状態にて適当な量だけハウジング６′の上端を
かしめて固定した。なお、言うまでもないが、外
側電極用電位取り出し金具４′と保護カバー９は
接合点９ｃにおいて溶接されており、保護カバー
９とハウジング６′とのより完全な導通を得るた
めに溶接８b′がなされる。また、内側電極用取り
出し金具５′と被覆線１３との接点１３ａも溶接
により連結され、保護カバー９の上端部と被覆線
１３との間隙には例えばシリコーンゴム等の耐熱
性弾性体１４を充填し、保護カバー先端部９ｄを
半径方向にかしめ本考案における実施例たる酸素
センサを完成した。 The assembly is set in the housing 6' at the locking part 2'b of the ceramic insulator 2' through the packing 11, and talc, asbestos, pyrofluorite, graphite, etc. are placed on the locking part 2'b. Cushion material 10 made of heat-resistant material such as Aite
A protective cover 9 having an air introduction slit 9a is attached from above. Next, in order to position the protective cover 9, a ring 12 made of, for example, stainless steel or copper was placed, and in this state, the upper end of the housing 6' was caulked by an appropriate amount to fix it. Needless to say, the potential extraction fitting 4' for the outer electrode and the protective cover 9 are welded at the joint point 9c, and welding 8b' is performed to obtain more complete conduction between the protective cover 9 and the housing 6'. Ru. Further, the contact point 13a between the inner electrode extraction fitting 5' and the covered wire 13 is also connected by welding, and the gap between the upper end of the protective cover 9 and the covered wire 13 is filled with a heat-resistant elastic material 14 such as silicone rubber. Then, the protective cover tip 9d was caulked in the radial direction to complete an oxygen sensor according to an embodiment of the present invention.
次に、本考案酸素センサの低温作動性及び素子
割れ防止性について試験した結果を示す。 Next, the results of testing the low temperature operability and element crack prevention properties of the oxygen sensor of the present invention will be shown.
第５図に示した構造の酸素センサを本考案の実
施例とし、第１図及び第２図に示した構造の酸素
センサを比較例Ａ、比較例Ｂとした。これらのセ
ンサを自動車用エンジンの排気管に取り付け定常
運転後一旦エンジンを停止し、一定時間後再始動
した際の素子先端の温度上昇の様子を第６図に示
した。図中、エンジン再スタート点を矢印Ｓで示
す。第６図からも明らかな様に、エンジン排気温
の経時変化に対して本考案実施例はよく追従して
おり、良好な結果が得られた。これに対して比較
例Ａ，Ｂは素子先端部の温度上昇が遅く、制御信
号（星印）も遅い時期に発生していることがよく
わかる。 The oxygen sensor having the structure shown in FIG. 5 was taken as an example of the present invention, and the oxygen sensors having the structure shown in FIGS. 1 and 2 were taken as Comparative Example A and Comparative Example B. These sensors were attached to the exhaust pipe of an automobile engine, the engine was stopped once after steady operation, and the temperature rise at the tip of the element was shown in FIG. 6 when the engine was restarted after a certain period of time. In the figure, the engine restart point is indicated by an arrow S. As is clear from FIG. 6, the embodiment of the present invention closely followed the change in engine exhaust temperature over time, and good results were obtained. On the other hand, it can be clearly seen that in Comparative Examples A and B, the temperature rise at the tip of the element is slow, and the control signal (asterisk) is also generated at a late time.
第７図は、実施例及び比較例Ａ，Ｂのセンサを
リツチ雰囲気中にさらしておいて温度を上昇させ
ていつたときのセンサ起電力の変化を示すグラフ
である。図からわかる様に、本考案実施例は比較
例Ａ，Ｂに比して急激な起電力の立ち上りを示し
ている。図において、起電力が0.45Vに達するま
での素子先端部の温度を比較すると、実施例セン
サは比較例Ａ，Ｂセンサに比べ約80℃から50℃も
はやく立ち上つていることがよくわかる。なお、
実施例センサは使用中での断線、接触不良は全く
みられなかつた。 FIG. 7 is a graph showing changes in sensor electromotive force when the sensors of Examples and Comparative Examples A and B are exposed to a rich atmosphere and the temperature is increased. As can be seen from the figure, the example of the present invention shows a rapid rise in electromotive force compared to comparative examples A and B. In the figure, when comparing the temperature at the tip of the element until the electromotive force reaches 0.45V, it is clearly seen that the example sensor rises by about 80°C to 50°C faster than the comparative example A and B sensors. In addition,
In the sensor of the example, no wire breakage or poor contact was observed during use.
次に、センサが高温状態にあるとき、実施例及
び比較例Ａ，Ｂのセンサの露出部に水をかけた後
分解したところ、比較例Ａでは素子にクラツクが
発生していたが、実施例センサは比較例Ｂのそれ
と同様に全く異常はみられず、水たまり走行時の
素子割れに対処できるものと判定できた。 Next, when the sensors were in a high temperature state, water was poured on the exposed parts of the sensors of Example and Comparative Examples A and B, and then they were disassembled. In Comparative Example A, cracks occurred in the element, but in the Example As with Comparative Example B, no abnormalities were observed in the sensor, and it was determined that the sensor could cope with element cracking during running in puddles.
上記のほか、本考案酸素センサによれば素子が
小型化できるため高価な固体電解質の使用量を少
くすることができ、また部品点数も少ないため、
省資源的にも、作業性の面でも有利であり、更に
はコスト的にも有利であるという利点が得られ
る。 In addition to the above, according to the oxygen sensor of the present invention, the element can be made smaller, so the amount of expensive solid electrolyte used can be reduced, and the number of parts is small, so
It is advantageous in terms of resource saving, workability, and cost.
第１図は従来の酸素センサの断面図、第２図は
従来の改良型酸素センサの断面図、第２図ａは第
２図の要部拡大断面図、第３図は第２図のセンサ
の一部の分解斜視図、第４図は本考案酸素センサ
の構成を示す分解斜視図、第５図は本考案酸素セ
ンサの断面図、第６図は実施例及び比較例のセン
サのエンジン実機による温度特性の経時変化を示
すグラフ、第７図は実施例及び比較例のセンサの
温度変化に対するセンサ起電力の変化を示すグラ
フである。
図中、１……素子、２……外側インシユレータ
ー、２′……セラミツクインシユレーター、３…
…内側インシユレーター、３′……位置決め用パ
イプ、４，４′……外側電極用電位取り出し金具、
５……内側電極用リード線、５′……内側電極用
電位取り出し金具、６，６′……ハウジング。
Figure 1 is a sectional view of a conventional oxygen sensor, Figure 2 is a sectional view of a conventional improved oxygen sensor, Figure 2a is an enlarged sectional view of the main part of Figure 2, and Figure 3 is the sensor of Figure 2. FIG. 4 is an exploded perspective view showing the configuration of the oxygen sensor of the present invention, FIG. 5 is a sectional view of the oxygen sensor of the present invention, and FIG. 6 is an actual engine engine of the sensor of the embodiment and comparative example. FIG. 7 is a graph showing changes in sensor electromotive force with respect to temperature changes of the sensors of the example and comparative example. In the figure, 1...element, 2...outer insulator, 2'...ceramic insulator, 3...
...Inner insulator, 3'...Positioning pipe, 4,4'...Outer electrode potential extraction fitting,
5... Lead wire for inner electrode, 5'... Potential extraction fitting for inner electrode, 6, 6'... Housing.
Claims (1)
体の内側及び外側表面にそれぞれ電極を形成して
なる素子を円筒状セラミツクインシユレーター先
端に密着固定してなる酸素センサにおいて、 該セラミツクインシユレーター内に軸方向の途
中に膨出部を有する円筒状の内側電極用電位取り
出し金具を位置せしめ、該セラミツクインシユレ
ーターに位置決め用パイプを素子固定側と反対側
より嵌入し前記膨出部に係止せしめることによつ
て、セラミツクインシユレーター先端部内に空間
を設けたことを特徴とする酸素センサ。[Claims for Utility Model Registration] An oxygen sensor consisting of an element formed by forming electrodes on the inner and outer surfaces of a container-shaped body made of an oxygen ion-conducting solid electrolyte and closely fixed to the tip of a cylindrical ceramic insulator. In this step, a cylindrical inner electrode potential extraction fitting having a bulging part in the middle in the axial direction is positioned in the ceramic insulator, and a positioning pipe is inserted into the ceramic insulator from the side opposite to the element fixing side. An oxygen sensor characterized in that a space is provided within the tip of the ceramic insulator by being locked to the bulge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6710981U JPH0131962Y2 (en) | 1981-05-09 | 1981-05-09 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6710981U JPH0131962Y2 (en) | 1981-05-09 | 1981-05-09 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57179155U JPS57179155U (en) | 1982-11-13 |
| JPH0131962Y2 true JPH0131962Y2 (en) | 1989-10-02 |
Family
ID=29863124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6710981U Expired JPH0131962Y2 (en) | 1981-05-09 | 1981-05-09 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0131962Y2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5947726B2 (en) * | 2011-08-17 | 2016-07-06 | 日本特殊陶業株式会社 | Gas sensor |
| JP5916529B2 (en) * | 2012-06-20 | 2016-05-11 | 日本特殊陶業株式会社 | Gas sensor |
-
1981
- 1981-05-09 JP JP6710981U patent/JPH0131962Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57179155U (en) | 1982-11-13 |
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