JPH056529Y2 - - Google Patents
Info
- Publication number
- JPH056529Y2 JPH056529Y2 JP1983174005U JP17400583U JPH056529Y2 JP H056529 Y2 JPH056529 Y2 JP H056529Y2 JP 1983174005 U JP1983174005 U JP 1983174005U JP 17400583 U JP17400583 U JP 17400583U JP H056529 Y2 JPH056529 Y2 JP H056529Y2
- Authority
- JP
- Japan
- Prior art keywords
- electrode layer
- internal electrode
- sensing element
- metal terminal
- 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 - Lifetime
Links
- 239000001301 oxygen Substances 0.000 claims description 39
- 229910052760 oxygen Inorganic materials 0.000 claims description 39
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 38
- 229910052751 metal Inorganic materials 0.000 claims description 37
- 239000002184 metal Substances 0.000 claims description 37
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 15
- 239000007789 gas Substances 0.000 description 7
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 5
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 238000002788 crimping Methods 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000007784 solid electrolyte Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 150000002926 oxygen Chemical class 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000004881 precipitation hardening Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Description
【考案の詳細な説明】
本考案は各種燃焼機器における排気中の酸素濃
度を検出する酸素センサの構造に関するものであ
る。[Detailed Description of the Invention] The present invention relates to the structure of an oxygen sensor that detects the oxygen concentration in exhaust gas in various combustion equipment.
従来より、内燃機関を初め各種燃焼器の排気中
の酸素濃度を検出する酸素センサとして、ジルコ
ニア等の固体電解質からなる酸素検知素子を用い
たものが広く使用されている。 BACKGROUND ART Conventionally, oxygen sensors that use an oxygen sensing element made of a solid electrolyte such as zirconia have been widely used as oxygen sensors for detecting the oxygen concentration in exhaust gas from various combustors including internal combustion engines.
この種の酸素センサは、第１図に図示する如
く、一端を閉塞され筒状に形成されたジルコニア
等からなる酸素検知素子１と、その内外面に被着
形成された白金等からなる内部電極層２及び外部
電極層３と、内部電極層２に電気的に接続され、
内部電極層２から出力を取り出すための出力取り
出し用リード線４と、外部電極層３に電気的に接
続され、酸素検知素子１を把持するためのハウジ
ング５とから構成され、内部電極層２を外気に、
外部電極層３を排気に接触せしめることによつ
て、排気の酸素濃度が検知できるようにされてい
る。 As shown in FIG. 1, this type of oxygen sensor includes an oxygen sensing element 1 made of zirconia or the like, which is formed into a cylindrical shape with one end closed, and internal electrodes made of platinum or the like adhered to the inner and outer surfaces of the element. electrically connected to the layer 2 and the external electrode layer 3 and the internal electrode layer 2;
It is composed of an output lead wire 4 for taking out the output from the internal electrode layer 2, and a housing 5 that is electrically connected to the external electrode layer 3 and for holding the oxygen sensing element 1. To the outside air,
By bringing the external electrode layer 3 into contact with the exhaust gas, the oxygen concentration of the exhaust gas can be detected.
ところで内部電極層２は外気と接触させると共
に出力取り出し用リード線４と接続する必要があ
ることから、この出力取り出し用リード線４と内
部電極層２との接続には種々の難点があつた。例
えば酸素検知素子１の開放端部内面に雌ねじ部６
を刻設し、雄ねじ部７が刻設された管状の金属端
子８を雌ねじ部６に螺合すると共に出力取り出し
用リード線４と接続させることによつて、内部電
極層２と出力取り出し用リード線４とを電気的に
接続するようにした場合には、雌ねじ部６に大き
な締め付け応力が加わり、酸素検知素子１を破損
してしまうといつた問題があつた。また上記筒状
の金属端子８の代わりとしてコイル状に形成され
たコイルバネ端子を用い、このコイルバネ端子を
上記雌ねじ部６に螺入すことによつて酸素検知素
子の破損を防止するといつたことも行われている
が、この場合にはコイルバネ端子が雌ねじ部６の
内周を押圧するように、コイルバネ端子の外径を
雌ねじ部６の内径よりも大きく形成することか
ら、このコイルバネ端子を雌ねじ部６に螺入する
ことは容易ではなく手間がかかるという問題があ
つた。 By the way, since the internal electrode layer 2 needs to be brought into contact with the outside air and connected to the output lead wire 4, there are various difficulties in connecting the output lead wire 4 and the internal electrode layer 2. For example, there is a female thread 6 on the inner surface of the open end of the oxygen sensing element 1.
By screwing a tubular metal terminal 8 with a male threaded part 7 into the female threaded part 6 and connecting it to the output lead wire 4, the internal electrode layer 2 and the output lead are connected. When the wire 4 is electrically connected to the wire 4, a large tightening stress is applied to the female threaded portion 6, causing a problem that the oxygen sensing element 1 may be damaged. It is also said that damage to the oxygen sensing element can be prevented by using a coiled spring terminal in place of the cylindrical metal terminal 8 and screwing this coiled spring terminal into the female threaded portion 6. However, in this case, the outer diameter of the coil spring terminal is made larger than the inner diameter of the female thread part 6 so that the coil spring terminal presses the inner circumference of the female thread part 6. There was a problem that it was not easy to screw in 6 and it took time and effort.
よつて本考案は、内部電極層の内周を内側から
半径方向に押圧する弾発力を有した金属端子を用
いることによつて、酸素検知素子の破損を防止す
ると共に当該金属端子を螺入することなく容易に
組み付け作業を行えるようにした酸素センサを提
供することを目的としている。 Therefore, the present invention prevents damage to the oxygen sensing element by using a metal terminal that has a resilient force that presses the inner periphery of the internal electrode layer in the radial direction from the inside, and also prevents the metal terminal from being screwed in. The object of the present invention is to provide an oxygen sensor that can be easily assembled without any trouble.
かかる目的を達するための本考案の構成は、内
外面に電極層を有する一端が閉塞された筒状の酸
素検知素子を備えると共に、該酸素検知素子内面
の内部電極層と電気的に接続された出力取出し用
リード線を備えた酸素センサにおいて、
上記出力取出し用リード線と上記内部電極層と
の接続部に、金属板を筒状に形成してなり、該金
属板の弾発力により内部電極層の内周面を内部よ
り半径方向に押圧する金属端子を用いたことを特
徴とする酸素センサを要旨としている。 The configuration of the present invention to achieve such an object includes a cylindrical oxygen sensing element with one end closed and having electrode layers on the inner and outer surfaces, and is electrically connected to an internal electrode layer on the inner surface of the oxygen sensing element. In an oxygen sensor equipped with an output lead wire, a metal plate is formed in a cylindrical shape at the connection portion between the output lead wire and the internal electrode layer, and the internal electrode is formed by the elastic force of the metal plate. The gist is an oxygen sensor characterized by using a metal terminal that presses the inner circumferential surface of the layer in the radial direction from the inside.
次に本考案を、一実施例を挙げて図面と共に説
明する。 Next, the present invention will be explained by giving an example and referring to the drawings.
第２図は本実施例の酸素センサの一部破断正面
図である。図において１１は一端が閉塞され、筒
状に形成されたジルコニア等の固体電解質からな
る酸素検知素子、１２は該酸素検知素子１１の内
面に蒸着等により被着された白金の内部電極層、
１３は内部電極層１２と同様に酸素検知素子１１
の外面に被着された外部電極層、１４は内部電極
層１２と電気的に接続され、内部電極層１２の出
力を取り出すための出力取り出し用リード線、１
５は外部電極層１３と電気的に接続され、酸素検
知素子１１を把持するための筒状に形成されたハ
ウジングである。ハウジング１５の外周には燃焼
機器に取り付けるためのねじ部１５ａが刻設され
ており、燃焼機器壁面に当接される部分には排気
が漏れないようガスケツト１６が設けられてい
る。またハウジング１５には加締部１５ｂが形成
されており、この加締部１５ｂを加締めることに
よつてハウジング１５の内周に配設された板パツ
キン１７、滑石１８、加締リング１９及び外筒の
つば部２２ａを介して酸素検知素子１１がハウジ
ング１５に把持されるようになる。２０は、排気
が外部電極層１３に接触されるよう排気の流通孔
２０ａが複数個穿設された、酸素検知素子１１を
保護するためのプロテクタであり、ハウジング１
５の燃焼機器側先端部１５ｃに取り付けられてい
る。 FIG. 2 is a partially cutaway front view of the oxygen sensor of this example. In the figure, 11 is an oxygen sensing element made of a solid electrolyte such as zirconia, which is closed at one end and formed in a cylindrical shape; 12 is an internal electrode layer of platinum deposited on the inner surface of the oxygen sensing element 11 by vapor deposition, etc.;
13 is the oxygen sensing element 11 similar to the internal electrode layer 12
An external electrode layer 14 is electrically connected to the internal electrode layer 12 and is an output lead wire 1 for taking out the output of the internal electrode layer 12.
A cylindrical housing 5 is electrically connected to the external electrode layer 13 and is used to hold the oxygen sensing element 11. A threaded portion 15a for attaching to a combustion device is cut on the outer periphery of the housing 15, and a gasket 16 is provided at a portion that comes into contact with the wall of the combustion device to prevent exhaust gas from leaking. Further, the housing 15 is formed with a caulking portion 15b, and by caulking the caulking portion 15b, the plate packing 17, the talc 18, the caulking ring 19, and the outer ring disposed on the inner circumference of the housing 15 are removed. The oxygen sensing element 11 is held by the housing 15 via the flange portion 22a of the cylinder. 20 is a protector for protecting the oxygen sensing element 11, which is provided with a plurality of exhaust gas flow holes 20a so that the exhaust gas comes into contact with the external electrode layer 13;
It is attached to the combustion equipment side tip part 15c of No. 5.
次に２１は酸素検知素子１１の内部電極層１２
と出力取り出し用リード線１４とを接続するため
の金属端子であり、バネ鋼板、ここでは析出硬化
系ステンレスであるバネ用ステンレス鋼帯
SUS631−CSP（JIS G4313）を用い、後述するよ
うに、半径方向の弾発力を呈しうるようにこれを
丸めて作つた接続部２１ａを有し、該接続部２１
ａは酸素検知素子の開口１１ａ内に圧縮力を加え
て挿入してから開放することによつて開口内面に
被着された内部電極層１２に対して圧接状態とな
つて着定されるとともに電気的に接続される。接
続部２１ａは外筒２２によつて保護される。また
金属端子２１と出力取り出し用リード線１４と
は、出力取り出し用リード線１４の芯線１４ａと
金属端子２１の端子部２１ｂで、圧着によつて接
続され、そして本センサ内部に水や油が浸透しな
いように、ばね２３と、該ばね２３によつて端部
に固定されかつリード線を挿通せしめたシール部
材２４とを有する保護外筒２５によつて保護され
ている。 Next, 21 is an internal electrode layer 12 of the oxygen sensing element 11.
It is a metal terminal for connecting the lead wire 14 for output extraction, and is a spring steel plate, here a stainless steel strip for the spring which is precipitation hardening stainless steel.
Using SUS631-CSP (JIS G4313), as described later, it has a connecting part 21a made by rolling it so as to exhibit elastic force in the radial direction.
a is inserted into the opening 11a of the oxygen sensing element by applying a compressive force and then released, so that it is brought into pressure contact with the internal electrode layer 12 deposited on the inner surface of the opening and is fixed therein. connected. The connecting portion 21a is protected by the outer cylinder 22. Further, the metal terminal 21 and the output lead wire 14 are connected by crimping through the core wire 14a of the output lead wire 14 and the terminal portion 21b of the metal terminal 21, and water and oil penetrate into the sensor. It is protected by a protective outer cylinder 25 having a spring 23 and a sealing member 24 fixed to the end by the spring 23 and having a lead wire inserted therethrough.
次に本考案にかかる主要な部分である金属端子
２１は、第３図に示す如き形状をしている。第３
図イの展開図から明らかな如く、金属端子２１は
金属板を打ち抜いて作られ、接続部２１ａとここ
ではそれから幅狭で長く伸びる延長部の端に設け
た圧着端子部２１ｂとを備える。接続部２１ａ
は、長方形の金属板を単に円筒状に形成したもの
であつて、ねじ部もなく容易に形成されるもので
ある。従つて、本金属端子２１を使用した場合に
は、酸素検知素子１１の開口部内部にねじ部を刻
設する必要もなく、また組み付け作業も容易に行
えるようなる。尚、図におけるロは内部電極接続
部２１ａの側面図、ハはＡ−Ａ線断面図を示して
いる。 Next, the metal terminal 21, which is the main part of the present invention, has a shape as shown in FIG. Third
As is clear from the developed view of FIG. 1, the metal terminal 21 is made by punching out a metal plate, and includes a connecting portion 21a and a crimp terminal portion 21b provided at the end of a narrow and long extension from the connecting portion 21a. Connection part 21a
This is simply a rectangular metal plate formed into a cylindrical shape, and is easily formed without any threaded portion. Therefore, when this metal terminal 21 is used, there is no need to carve a threaded portion inside the opening of the oxygen sensing element 11, and the assembly work can be easily performed. Note that in the figure, B shows a side view of the internal electrode connection portion 21a, and C shows a cross-sectional view taken along the line A-A.
次に第４図及び第５図は接続部２１ａの他の形
状例を示しており、第４図は長方形の金属板に矩
形状の切り込みを入れ円筒状に形成したもの、第
５図は長方形の金属板に波状の切り込みを入れ円
筒状に形成したものである。このように長方形の
金属板に切り込みを入れて金属端子を形成した場
合には、金属端子は内部電極層の押圧部分を複数
個有することとなり、例えば外部からの力によつ
て金属端子が変形され、第４図に示す押圧部Ｐ１
が弾発力を失なつたような場合にでも、他の押圧
部Ｐ２ないしＰ４の弾発力によつて当該金属端子
は内部電極層にしつかりと固定されることから、
金属端子からの出力をより確実に取り出せるよう
になる。 Next, FIGS. 4 and 5 show other examples of the shape of the connecting portion 21a, in which FIG. 4 shows a rectangular metal plate with a rectangular cut formed into a cylindrical shape, and FIG. 5 shows a rectangular metal plate formed into a cylindrical shape. This metal plate is made into a cylindrical shape by making wavy cuts in it. When a metal terminal is formed by making a cut in a rectangular metal plate in this way, the metal terminal will have a plurality of pressed parts of the internal electrode layer, and for example, the metal terminal will be deformed by an external force. , the pressing part P1 shown in FIG.
Even if the metal terminal loses its elasticity, the elastic force of the other pressing parts P2 to P4 will firmly fix the metal terminal to the internal electrode layer.
Output from metal terminals can be taken out more reliably.
尚上記実施例においては、金属端子とリード線
との接合を金属端子の圧着により行なうようにし
ているが、例えばろう付け等、通常行なわれる接
合方法であれは何でもよい。 In the above embodiment, the metal terminal and the lead wire are joined by crimping the metal terminal, but any commonly used joining method such as brazing may be used.
上述した如く、本考案の酸素センサにおいて
は、酸素検知素子内面の内部電極層と出力取り出
し用リード線との接続を、内部電極層を内部より
押圧する弾発力を有する金属端子を用いて行うよ
うにしたことから、内部電極層にねじ部を刻設す
ることもなく容易に接続できるようになり、また
組み付け応力が加わることがないので酸素検知素
子が破損するといつたことも防止できる。更に、
金属端子は弾発力によつて内部電極層を押圧する
ことから、熱による膨張、収縮あるいは振動に対
しても影響されず、常に内部電極層に接続される
ようになり、内部電極層の出力の取り出しを確実
に行うことができるようになる。また更に金属端
子は金属板を筒状に形成したものであり、内部電
極層の内周面を内部より押圧するため、内部電極
層の一部に応力が加わり、電極層が破損するとい
つたことも防止できる。 As described above, in the oxygen sensor of the present invention, the connection between the internal electrode layer on the inner surface of the oxygen sensing element and the output lead wire is performed using a metal terminal that has a resilient force that presses the internal electrode layer from inside. This makes it possible to easily connect the internal electrode layer without having to carve a threaded portion therein, and since no assembly stress is applied, it is possible to prevent damage to the oxygen sensing element. Furthermore,
Since the metal terminal presses the internal electrode layer with its elastic force, it is not affected by thermal expansion, contraction, or vibration, and is always connected to the internal electrode layer, which reduces the output of the internal electrode layer. This makes it possible to reliably take out the material. Furthermore, a metal terminal is a metal plate formed into a cylindrical shape, and since the inner peripheral surface of the internal electrode layer is pressed from inside, stress is applied to a part of the internal electrode layer, which may cause damage to the electrode layer. can also be prevented.
第１図は従来の酸素センサの一例を示す半断面
正面図、第２図は本考案の実施例の酸素センサを
示す一部破断正面図、第３図は金属端子２１の接
続部２１ａの形状を示し、イは展開図、ロは側面
図、ハはＡ−Ａ線断面図、第４図及び第５図は金
属端子２１の他の形状例を示し、第３図と同様、
イは展開図、ロは側面図、ハはＢ−Ｂ線断面図及
びＣ−Ｃ線断面図である。
１，１１……酸素検知素子、２，１２……内部
電極層、４，１４……出力取り出し用リード線、
２１……金属端子。
FIG. 1 is a half-sectional front view showing an example of a conventional oxygen sensor, FIG. 2 is a partially cutaway front view showing an oxygen sensor according to an embodiment of the present invention, and FIG. 3 is a shape of the connecting portion 21a of the metal terminal 21. , A is a developed view, B is a side view, C is a sectional view taken along the line A-A, and FIGS. 4 and 5 show other examples of shapes of the metal terminal 21, similar to FIG.
A is a developed view, B is a side view, and C is a sectional view taken along the line B-B and sectional view taken along the line C-C. 1, 11... Oxygen sensing element, 2, 12... Internal electrode layer, 4, 14... Output lead wire,
21...Metal terminal.
Claims (1)
の酸素検知素子を備えると共に、該酸素検知素子
内面の内部電極層と電気的に接続された出力取出
し用リード線を備えた酸素センサにおいて、 上記出力取出し用リード線と上記内部電極層と
の接続部に、金属板を筒状に形成してなり、該金
属板の弾発力により内部電極層の内周面を内部よ
り半径方向に押圧する金属端子を用いたことを特
徴とする酸素センサ。[Claims for Utility Model Registration] A cylindrical oxygen sensing element with one end closed and having electrode layers on its inner and outer surfaces, and an output lead that is electrically connected to an internal electrode layer on the inner surface of the oxygen sensing element. In the oxygen sensor equipped with a wire, a metal plate is formed in a cylindrical shape at the connection portion between the output lead wire and the internal electrode layer, and the elastic force of the metal plate causes the inner periphery of the internal electrode layer to An oxygen sensor characterized by using a metal terminal whose surface is pressed radially from the inside.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17400583U JPS6090671U (en) | 1983-11-10 | 1983-11-10 | oxygen sensor |
| EP84307109A EP0145175B1 (en) | 1983-11-10 | 1984-10-17 | Oxygen sensor |
| DE8484307109T DE3474352D1 (en) | 1983-11-10 | 1984-10-17 | Oxygen sensor |
| US06/948,467 US4741816A (en) | 1983-11-10 | 1986-12-29 | Oxygen sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17400583U JPS6090671U (en) | 1983-11-10 | 1983-11-10 | oxygen sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6090671U JPS6090671U (en) | 1985-06-21 |
| JPH056529Y2 true JPH056529Y2 (en) | 1993-02-19 |
Family
ID=30378923
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17400583U Granted JPS6090671U (en) | 1983-11-10 | 1983-11-10 | oxygen sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6090671U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0710290Y2 (en) * | 1988-12-12 | 1995-03-08 | 日立化成工業株式会社 | Sensor terminal structure |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4960785A (en) * | 1972-08-28 | 1974-06-12 | ||
| JPS5855391B2 (en) * | 1981-02-10 | 1983-12-09 | 東陶機器株式会社 | Water supply connector for hot water mixer faucet |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5855391U (en) * | 1981-10-12 | 1983-04-14 | 株式会社石崎電機製作所 | heating element device |
| JPS5862261U (en) * | 1981-10-21 | 1983-04-26 | 日本電子機器株式会社 | Oxygen concentration sensor |
-
1983
- 1983-11-10 JP JP17400583U patent/JPS6090671U/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4960785A (en) * | 1972-08-28 | 1974-06-12 | ||
| JPS5855391B2 (en) * | 1981-02-10 | 1983-12-09 | 東陶機器株式会社 | Water supply connector for hot water mixer faucet |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6090671U (en) | 1985-06-21 |
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