JPS598188Y2 - oxygen sensor - Google Patents
oxygen sensorInfo
- Publication number
- JPS598188Y2 JPS598188Y2 JP1976168632U JP16863276U JPS598188Y2 JP S598188 Y2 JPS598188 Y2 JP S598188Y2 JP 1976168632 U JP1976168632 U JP 1976168632U JP 16863276 U JP16863276 U JP 16863276U JP S598188 Y2 JPS598188 Y2 JP S598188Y2
- Authority
- JP
- Japan
- Prior art keywords
- oxygen sensor
- heat
- resistant elastic
- lead wire
- elastic body
- 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
Landscapes
- Measuring Oxygen Concentration In Cells (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Description
【考案の詳細な説明】
本考案は水等の浸入が防止できるリード線取出し構造を
有する酸素センサに関する。[Detailed Description of the Invention] The present invention relates to an oxygen sensor having a lead wire extraction structure that can prevent water from entering.
最近、車輌の排気ガス中の有害物を無害化するために、
一酸化炭素、窒素酸化物、未燃炭化水素を同時に無害化
する３元触媒が開発されたが、この３元触媒が効果的に
作動するには空燃比の制御が不可欠となる。Recently, in order to detoxify harmful substances in vehicle exhaust gas,
A three-way catalyst has been developed that simultaneously detoxifies carbon monoxide, nitrogen oxides, and unburned hydrocarbons, but air-fuel ratio control is essential for this three-way catalyst to work effectively.
この空燃比を制御は排気ガス中の酸素濃度を測定し、こ
れを内燃機関の吸入系にフィードバックして行なわれて
いが、排気ガス中の酸素濃度の検出に酸素センサが用い
られる。This air-fuel ratio is controlled by measuring the oxygen concentration in the exhaust gas and feeding it back to the intake system of the internal combustion engine, and an oxygen sensor is used to detect the oxygen concentration in the exhaust gas.
酸素センサは、一般に、酸素イオン伝導性を有する特殊
なセラミック材から戊る固体電解質体の内外表面に金属
電極を形威した素子をボデイに収容して車輌の排気マニ
ホルドまたは排気管に取付け、素子の外表面を排気ガス
に触れさせると共に、素子の内表面を金属と金属酸化物
の混合物から戊る固体酸素極を封入した標準酸素濃度雰
囲気又は大気に触れさせ、酸素分圧の相違により前記両
金属電極に発生した起電力を両金属電極の両方又は一方
からリード線により取出すように構或されていた。Oxygen sensors generally have an element in which metal electrodes are formed on the inner and outer surfaces of a solid electrolyte body made of a special ceramic material that has oxygen ion conductivity. The outer surface of the element is exposed to exhaust gas, and the inner surface of the element is exposed to a standard oxygen concentration atmosphere containing a solid oxygen electrode made of a mixture of metal and metal oxide, or to the atmosphere. The structure was such that the electromotive force generated in the metal electrodes was taken out from both or one of the metal electrodes by a lead wire.
しかし、リード線の取出しにあたってはリード線が酸素
センサを貫通しながければならないことから、該貫通部
から酸素センサ内に、車輌走行中水や塩水等が侵入する
虞れがあり、これによって電流のリーク、錆の発生、そ
れらに伴なう種々の不都合が生じる危険性があった。However, since the lead wire must pass through the oxygen sensor to take out the lead wire, there is a risk that water, salt water, etc. may enter the oxygen sensor from the penetration part while the vehicle is running. There was a risk of current leakage, rust formation, and various other problems associated with these.
本考案は上記不都合の発生を解消した酸素センサを提供
することを目的とするものである。An object of the present invention is to provide an oxygen sensor that eliminates the above-mentioned disadvantages.
以下に本考案に係る酸素センサの一実施例を図に従って
説明する。An embodiment of the oxygen sensor according to the present invention will be described below with reference to the drawings.
図において、１は酸素イオン伝導性を有するセラミック
材、たとえばＺｒＯ２など、から戊る固体電解質体であ
り、その内外両表面にはｐｔなとの金属電極２，３を形
威して酸素センサ素子が構或してある。In the figure, 1 is a solid electrolyte body made of a ceramic material having oxygen ion conductivity, such as ZrO2, and metal electrodes 2 and 3 such as PT are formed on both the inner and outer surfaces of the solid electrolyte body to form an oxygen sensor element. is structured.
固体電解質体１の内部は標準酸素濃度を確保できるよう
にしてあるが、具体的には図に示したように金属と金属
酸化物の混合物から戒る固体酸素極４を充填して密封し
た構造とするかまたは大気に連通させた構造としてある
。The interior of the solid electrolyte body 1 is designed to ensure a standard oxygen concentration, but specifically, as shown in the figure, it has a sealed structure filled with a solid oxygen electrode 4 made of a mixture of metal and metal oxide. or as a structure that communicates with the atmosphere.
酸素センサ素子はボデイ５に支持させて車輌の排気マニ
ホルドまたは排気管に取付けてあり、その取付けは外部
金属電極３が排気ガスに触れるようにしてある。The oxygen sensor element is supported by the body 5 and attached to the exhaust manifold or exhaust pipe of the vehicle, and is attached so that the external metal electrode 3 comes into contact with exhaust gas.
６は多数の穿孔を有するカバーであり酸素センサ素子を
保護するためのものである。6 is a cover having a large number of perforations for protecting the oxygen sensor element.
金属電極２，３に発生した起電力は、一方を車輛にアー
スして他方にリード線を接続して外部に取出すか、また
は両方の金属電極の夫々にリード線を接続して外部に取
出される。The electromotive force generated in the metal electrodes 2 and 3 can be taken out by grounding one side to the vehicle and connecting a lead wire to the other, or by connecting a lead wire to each of both metal electrodes. Ru.
図は金属電極２，３の夫々にリード線７を接続して外部
に取出す場合のみを示している。The figure shows only the case where lead wires 7 are connected to each of the metal electrodes 2 and 3 and taken out to the outside.
ボテ゛イ５の内部には耐熱性絶縁材、たとえばセラミッ
ク８が装入してあり、リード線７が短絡することがない
構造としてある。A heat-resistant insulating material such as ceramic 8 is charged inside the body 5, and the structure is such that the lead wire 7 will not be short-circuited.
ボデイ５にはカバーチューブ９が結合してあり、シーノ
レ材１３によってカバーチューフ゛９とボテ゛イ５間を
液密としてある。A cover tube 9 is connected to the body 5, and a seam material 13 makes the gap between the cover tube 9 and the body 5 liquid-tight.
カバーチューブ９のボデイ５と反対側の端部には、耐熱
弾性体１０たとえばテフロンが圧大してあり、圧入取付
けによってカバーチューブ９とボデイ５間のシールを確
保してある。A heat-resistant elastic material 10 such as Teflon is compressed at the end of the cover tube 9 opposite to the body 5, and a seal between the cover tube 9 and the body 5 is ensured by press-fitting.
酸素センサ素子に接続するリード線７は耐熱弾性体１０
を貫通して外部に引出してあり、貫通部１１は耐熱弾性
体１０とリード線７とがしょっぱめになるようにしてあ
る。The lead wire 7 connected to the oxygen sensor element is a heat-resistant elastic body 10
The heat-resistant elastic body 10 and the lead wire 7 are connected to each other in the penetrating portion 11.
リード線７は、耐熱弾性体１０の貫通部１１において被
覆されていることが望ましい。It is desirable that the lead wire 7 is covered at the penetration part 11 of the heat-resistant elastic body 10.
また、カバーチューブ９は耐熱弾性体１０圧入後かしめ
によってしぼり部１２を形或し耐熱弾性体１０と抜止め
を図ることが望ましい。Further, it is preferable that the cover tube 9 is caulked after the heat-resistant elastic body 10 is press-fitted to form a constriction portion 12 or to prevent the heat-resistant elastic body 10 from slipping out.
本考案の酸素センサにあっては、酸素センサに水や塩水
がかかつても、耐熱弾性体１０とカバーチューブ９、カ
バーチューブ９とリード線７との液密が確保されている
ので、酸素センサ内に水が侵入することはない。In the oxygen sensor of the present invention, even if water or salt water gets into the oxygen sensor, liquid tightness between the heat-resistant elastic body 10 and the cover tube 9, and between the cover tube 9 and the lead wire 7 is ensured, so the oxygen sensor No water can get inside.
また、酸素センサ自体は一端が排気ガスに触れてかなり
高温となるが他端は外気中にあって温度は軽減されてお
り、かつリード線７貫通部にテフロン等の耐熱弾性体を
使用してあるので、熱によって液密構造が破壊されるこ
とはない。In addition, one end of the oxygen sensor itself comes in contact with exhaust gas and becomes quite hot, but the other end is in the outside air and the temperature is reduced, and a heat-resistant elastic material such as Teflon is used for the lead wire 7 penetration part. Therefore, the liquid-tight structure will not be destroyed by heat.
前記及び図面においては、主に固体酸素極を用いた酸素
センサで、リード線が２本外部に引出されるものについ
て説明したが、前記のリード線取出構造は、大気運通型
の酸素センサにも適用できるのは当然であり、かつ耐熱
弾性体を貫通するリード線の本数が１本のものにも適用
できることは当然で゛ある。In the above and drawings, the explanation has been given mainly to an oxygen sensor using a solid oxygen electrode with two lead wires drawn out to the outside, but the lead wire extraction structure described above can also be applied to an atmospheric-transport type oxygen sensor. It goes without saying that this invention can be applied, and it is also natural that it can be applied to cases where the number of lead wires passing through the heat-resistant elastic body is one.
本考案は、上記の構戒と作用を有するものであるから、
本考案の酸素センサによるときは、リード線が酸素セン
サを貫通するに拘らず、水や塩水の酸素センサ内への侵
入を防止することができ、それによって生じる種々の不
都合、たとえば電流のリーク、酸素センサの機能阻害、
錆の発生、などを未然に防ぐことができる。Since the present invention has the above-mentioned precepts and functions,
When using the oxygen sensor of the present invention, even though the lead wire passes through the oxygen sensor, it is possible to prevent water or salt water from entering the oxygen sensor, and various problems caused by this, such as current leakage, Oxygen sensor dysfunction,
This can prevent the occurrence of rust, etc.
図は本考案に係る酸素センサの断面図である。
図中の記号の意味は次の通りである。
２，３・・・・・・金属電極、７・・・・・・リード線
、９・・・・・・カバーチューブ、１０・・・・・・耐
熱弾性体。The figure is a sectional view of an oxygen sensor according to the present invention. The meanings of the symbols in the diagram are as follows. 2, 3...Metal electrode, 7...Lead wire, 9...Cover tube, 10...Heat-resistant elastic body.
Claims (1)
して該カバーチューブと該耐熱弾性体との間を液密に保
持し、酸素センサ素子に接続するノード線をしまりばめ
にして液密を保持しつつ前記耐熱弾性体を貫通させて外
部に引出したことを特徴とする酸素センサ。A heat-resistant elastic body is compressed on the cover tube connected to the body to maintain liquid tightness between the cover tube and the heat-resistant elastic body, and a node wire connected to the oxygen sensor element is tightly fitted to maintain liquid tightness. An oxygen sensor characterized in that the heat-resistant elastic body is penetrated and drawn out to the outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1976168632U JPS598188Y2 (en) | 1976-12-15 | 1976-12-15 | oxygen sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1976168632U JPS598188Y2 (en) | 1976-12-15 | 1976-12-15 | oxygen sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5385195U JPS5385195U (en) | 1978-07-13 |
| JPS598188Y2 true JPS598188Y2 (en) | 1984-03-13 |
Family
ID=28776254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1976168632U Expired JPS598188Y2 (en) | 1976-12-15 | 1976-12-15 | oxygen sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS598188Y2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52122787A (en) * | 1976-04-09 | 1977-10-15 | Hitachi Ltd | Monitor circuit |
-
1976
- 1976-12-15 JP JP1976168632U patent/JPS598188Y2/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52122787A (en) * | 1976-04-09 | 1977-10-15 | Hitachi Ltd | Monitor circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5385195U (en) | 1978-07-13 |
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