JP3029802B2 - Gas sensor - Google Patents
Gas sensorInfo
- Publication number
- JP3029802B2 JP3029802B2 JP8188547A JP18854796A JP3029802B2 JP 3029802 B2 JP3029802 B2 JP 3029802B2 JP 8188547 A JP8188547 A JP 8188547A JP 18854796 A JP18854796 A JP 18854796A JP 3029802 B2 JP3029802 B2 JP 3029802B2
- Authority
- JP
- Japan
- Prior art keywords
- flange
- insulating member
- annular spring
- end side
- spring 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 - Fee Related
Links
Landscapes
- Measuring Oxygen Concentration In Cells (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、内燃機関の排気ガ
ス中の酸素濃度を検出するために使用される酸素センサ
などのガスセンサ（以下、単にセンサともいう）に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas sensor such as an oxygen sensor used for detecting the concentration of oxygen in exhaust gas of an internal combustion engine (hereinafter, simply referred to as a sensor).
【０００２】[0002]
【従来の技術】この種のガスセンサは、内外面にそれぞ
れ電極層を有する先端が閉塞された筒状のジルコニア等
の酸素イオン導電体（固体電解質）からなる酸素濃度の
検出素子（以下、単に素子ともいう）と、該素子を把持
して排気ガス管に取付けられる取付け金具本体（ホル
ダ）等からなっている。このものは、内燃機関の排気ガ
ス管に取着され、前記素子の内側面の電極層（基準電極
層）を基準酸素ガス（大気）に、外側面の電極層（測定
電極層）を排気ガスに接触させ、素子内外面の酸素濃度
差に対応して両電極間に起電力（電位差）を生じさせ、
この起電力に基づく信号を制御回路に出力し、酸素濃度
を検知し、制御するようにされている。2. Description of the Related Art A gas sensor of this type comprises an oxygen concentration detecting element (hereinafter simply referred to as an element) made of an oxygen ion conductor (solid electrolyte) such as cylindrical zirconia having a closed end and having electrode layers on the inner and outer surfaces. ), And a mounting bracket body (holder) or the like that grips the element and attaches it to the exhaust gas pipe. This is attached to an exhaust gas pipe of an internal combustion engine, and the electrode layer (reference electrode layer) on the inner surface of the element is used as reference oxygen gas (atmosphere), and the electrode layer (measurement electrode layer) on the outer surface is used as exhaust gas. To generate an electromotive force (potential difference) between both electrodes corresponding to the oxygen concentration difference between the inner and outer surfaces of the element,
A signal based on the electromotive force is output to a control circuit to detect and control the oxygen concentration.
【０００３】このようなガスセンサでは、素子の内側と
外側とのシール（気密及び液密）が破壊されると、その
使用過程で排気ガス或いはそれに含まれる油等がその内
側に侵入することになり、素子内面側の基準酸素ガスが
汚染され、酸素濃度の検知能力の低下や内側面の電極層
の腐食を招くなど様々な問題を生じる。したがって、と
くに排気ガスの侵入の可能性のある接合箇所ないし構造
上の間隙（隙間）のシールは十分に確保しないといけな
い。[0003] In such a gas sensor, when the seal (airtightness and liquid tightness) between the inside and the outside of the element is broken, exhaust gas or oil contained therein invades the inside during the use process. In addition, the reference oxygen gas on the inner surface side of the element is contaminated, which causes various problems such as a decrease in the ability to detect the oxygen concentration and corrosion of the electrode layer on the inner side surface. Therefore, it is necessary to secure a sufficient seal especially at a joint or a structural gap (gap) where exhaust gas may enter.
【０００４】図８及び図９は、こうしたガスセンサ１０
１の一例を示すものであるが、このものでは次のように
してシールが確保されている。すなわち、筒状の金具本
体（以下、単に本体ともいう）１０２の内側に検出素子
１０３を内挿し、その間に滑石（タルク粉体）等からな
るシール材１０４を充填して、次記する組み立て手段に
より、そのシール材１０４を軸方向（図８上下方向）に
圧縮することによって金具本体１０２と検出素子１０３
との間の先端側（図８下側）におけるシール性が保持さ
れるよう構成されており、排気ガス管Ｈに取付けられた
際でも排気ガスＧが素子１０３の内側に入り込まないよ
うに構成されている。FIGS. 8 and 9 show such a gas sensor 10.
1 shows an example, in which a seal is secured as follows. That is, a detecting element 103 is inserted inside a cylindrical fitting main body (hereinafter, also simply referred to as a main body) 102, and a sealing material 104 made of talc (talc powder) or the like is filled therebetween. By compressing the sealing material 104 in the axial direction (vertical direction in FIG. 8), the fitting main body 102 and the detecting element 103 are compressed.
The sealing property on the tip side (the lower side in FIG. 8) is maintained so that the exhaust gas G does not enter the inside of the element 103 even when attached to the exhaust gas pipe H. ing.
【０００５】そして、このセンサ１０１は次のように組
み立てられている。すなわち、まず、金具本体１０２の
先端側の内周に内向きに突出する内周段部１０５に、平
パッキン１０６及び上面内周縁が凹部１０７をなすリン
グ状の絶縁部材１０８を順次配置し、その上に、外周に
外向きに突出する外周凸部（フランジ）１０９が周設さ
れた検出素子１０３を、その先端１０３ａ側から本体１
０２内に同軸状に内挿し、その外周凸部１０９をリング
状の絶縁部材の１０８上面内周縁の凹部１０７に板パッ
キン１１０を介して係合させる。そして、金具本体１０
２の内周面と検出素子１０３の外周面との間であって、
検出素子１０３の外周凸部より後端側（図上側）にシー
ル材１０４を充填し、そのシール材１０４より後端側に
リング（円筒）状の絶縁部材１１１を同軸状に内挿す
る。そしてこの絶縁部材１１１の後端面側に金属製のリ
ング状パッキン１１２を介装し、さらにその後端面（上
面）側に、筒体１１３を同軸状に内挿し、その先端部外
周に周設されたフランジ１１４が金属製のリング状パッ
キン１１２に当接するようにし、該パッキン１１２を介
して絶縁部材１１１を先端側に押圧するようにし、その
状態の下で、金具本体１０２の後端部の周縁１１５を内
側に折り曲げてそのフランジ１１４を覆うと共に先端側
に圧縮してその周縁１１５をかしめる。そして、この際
の圧縮力により、シール材１０４を軸方向（図示上下方
向）に圧縮し、そのシール材１０４の弾性を利用して金
具本体１０２と検出素子１０３との間（排気ガスＧ側と
基準ガス側と間）の先端側におけるシール性を保持して
いる。The sensor 101 is assembled as follows. That is, first, a flat packing 106 and a ring-shaped insulating member 108 having an upper inner peripheral edge forming a concave portion 107 are sequentially arranged on an inner peripheral step portion 105 protruding inward on an inner periphery on the distal end side of the fitting main body 102. The detection element 103 having an outer peripheral projection (flange) 109 protruding outward on the outer periphery is provided on the upper side of the main body 1 from its tip 103a side.
02 is coaxially inserted into the inside of the ring-shaped member 02, and the outer peripheral convex portion 109 is engaged with the concave portion 107 on the inner peripheral edge of the upper surface of the ring-shaped insulating member via the plate packing 110. And the metal fitting body 10
2 and the outer peripheral surface of the detection element 103,
A sealing material 104 is filled on the rear end side (upper side in the figure) of the outer peripheral convex portion of the detection element 103, and a ring (cylindrical) insulating member 111 is coaxially inserted on the rear end side of the sealing material 104. A ring-shaped packing 112 made of metal is interposed on the rear end surface of the insulating member 111, and a cylindrical body 113 is coaxially inserted on the rear end surface (upper surface) of the insulating member 111. The flange 114 is brought into contact with the ring-shaped packing 112 made of metal, and the insulating member 111 is pressed to the front end side via the packing 112. Under this state, the peripheral edge 115 of the rear end of the fitting body 102 is formed. Is bent inward to cover the flange 114 and compressed to the tip side to crimp the peripheral edge 115. Then, the sealing material 104 is compressed in the axial direction (vertical direction in the drawing) by the compressive force at this time, and the elasticity of the sealing material 104 is used to allow the space between the metal fitting body 102 and the detection element 103 (exhaust gas G side). The sealability is maintained on the tip side (between the reference gas side).
【０００６】しかして、この工程の後、素子１０３を覆
うように金具本体１０２に保護キャップ１１６を装着
し、要すれば加熱用のセラミックヒータ１１７を内挿
し、或いは各々のリード線１１８の接続をするなどし、
さらに、筒体１１３の上端部外側に、保護外筒１１９を
外嵌して径方向に絞り込むなどして製品となる。After this step, a protective cap 116 is attached to the metal fitting body 102 so as to cover the element 103, and if necessary, a ceramic heater 117 for heating is inserted, or the connection of each lead wire 118 is made. And so on,
Further, a protective outer cylinder 119 is externally fitted on the outer side of the upper end portion of the cylindrical body 113 and is narrowed down in a radial direction to obtain a product.
【０００７】[0007]
【発明が解決しようとする課題】ところで、粉末状のシ
ール材を用いた場合には、金属パッキンやゴムパッキン
等の固体のパッキン材のようにパッキン材自体の寸法精
度が問題とならない上に、シールを確保する相手側部材
（本体１０２や素子１０３）との接触面での精密な嵌合
性をとらなくても安定したシール性を確保できる。しか
し、こうして組み立てられたガスセンサ１０１が排気ガ
ス管Ｈに取付けられて使用される場合には高温で過酷な
雰囲気下にさらされるので、こうした使用条件によって
は、前記従来のガスセンサ１０１のシール構造では、長
期間の使用により気密性が劣化（低下）することがあっ
た。というのは、金具本体１０２が高温域にさらされる
とそれ自体が熱膨張を繰返し起こす一方、滑石などのシ
ール材１０４は一部焼結を起こすので、その体積が収縮
するとともに、前記従来のシール性能は、主として圧縮
されたシール材１０４自体の残留圧縮応力に依存してい
るため、このような状況下に長時間繰返しさらされる
と、少しずつ組み立て時に圧縮されたシール材１０４に
弛緩が生じ、その結果、圧縮応力が低下してしまうため
である。そして、シール性能が低下すると、前記したよ
うにその結果として素子１０３と金具本体１０２との間
から排気ガスＧが侵入してセンサ出力が低下する等の不
具合が発生し、ついには酸素濃度の検出精度が低下する
ことがある。By the way, when a powdery sealing material is used, the dimensional accuracy of the packing material itself does not matter, unlike solid packing materials such as metal packing and rubber packing. Stable sealing performance can be ensured without requiring precise fitting at the contact surface with the counterpart member (main body 102 or element 103) for ensuring sealing. However, when the gas sensor 101 thus assembled is used by being attached to the exhaust gas pipe H, the gas sensor 101 is exposed to a high temperature and severe atmosphere. The airtightness sometimes deteriorated (decreased) due to long-term use. That is, when the metal fitting body 102 is exposed to a high temperature range, the metal body itself repeatedly undergoes thermal expansion, while the sealing material 104 such as talc partially sinters, so that its volume shrinks and the conventional sealing method is used. Since the performance mainly depends on the residual compressive stress of the compressed seal material 104 itself, if the seal material 104 is repeatedly exposed under such a condition for a long time, the compressed seal material 104 gradually relaxes during assembly, As a result, the compressive stress is reduced. When the sealing performance is reduced, as described above, as a result, a problem occurs such that the exhaust gas G enters between the element 103 and the fitting main body 102 and the sensor output is reduced. Accuracy may decrease.
【０００８】もっとも、現在の使用温度条件下では、そ
のような不具合が生じることはないが、今後のエンジン
の高性能化に伴いガスセンサが従来よりも高温の使用条
件で使われる場合もあるので、その対応が要請されてい
る。本発明は、上記従来のガスセンサの持つこのような
問題点に鑑み、さらにこのような要請に鑑みて案出され
たものであって、金具本体と素子との間の先端側のシー
ル性を長期間にわたって確保し、信頼性ないし耐久性の
高いガスセンサを提供することを目的とする。[0008] Although such problems do not occur under the current operating temperature conditions, the gas sensor may be used under higher operating conditions than before in accordance with the future improvement of engine performance. The response is requested. The present invention has been made in view of the above problems of the conventional gas sensor, and further has been devised in view of such a demand. The present invention has a long sealing property at the tip end between the metal fitting body and the element. It is an object of the present invention to provide a highly reliable or highly durable gas sensor that is secured over a period.
【０００９】[0009]
【課題を解決するための手段】上記の目的を達成するた
めに本発明は、先端側の内周に内向きに突出する内周段
部が周設された筒状の金具本体の内側に、外周に外向き
に突出する外周凸部が周設された検出素子が、該検出素
子の先端側から同軸状に内挿されて該外周凸部を前記内
周段部に絶縁を保持して係合され、前記金具本体の内周
面と該検出素子の外周面との間であって、該検出素子の
外周凸部より後端側にはシール材が充填され、該シール
材より後端側にはリング状の絶縁部材が同軸状に内挿さ
れ、さらに端部外周にフランジが周設された筒体が、そ
のフランジで前記絶縁部材を先端側に押圧するように同
軸状に内挿され、該金具本体の後端部の周縁が内側に折
り曲げられて該フランジを覆うと共に、前記シール材を
軸方向に圧縮する構造のガスセンサにおいて、前記絶縁
部材と前記筒体のフランジとの間に、これらとほぼ同軸
状でばね性を有する環状ばね体が配置され、しかも、前
記絶縁部材と前記筒体のフランジは、該環状ばね体の内
周寄り部位と外周寄り部位とを軸方向の互いに反対側に
向けて弾性変形させるような寸法関係に形成され、この
環状ばね体の弾性変形によって前記シール材を圧縮する
方向に前記絶縁部材を常時押圧してなることにある。SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a cylindrical metal fitting body having an inner peripheral step portion which protrudes inward on the inner periphery at the distal end side. A detecting element having an outer peripheral convex portion protruding outward on the outer periphery is coaxially inserted from the distal end side of the detecting element, and the outer peripheral convex portion is engaged with the inner peripheral step portion while maintaining insulation. A seal material is filled between the inner peripheral surface of the metal fitting body and the outer peripheral surface of the detection element, and the rear end side of the outer peripheral convex portion of the detection element is filled with a sealing material, and the rear end side of the sealing material. A ring-shaped insulating member is coaxially inserted, and a cylindrical body having a flange provided on the outer periphery of the end is coaxially inserted so that the flange presses the insulating member toward the distal end. The peripheral edge of the rear end portion of the metal fitting body is bent inward to cover the flange and compress the seal material in the axial direction. In the gas sensor of the present invention, an annular spring body having a spring property that is substantially coaxial with the insulating member and the flange of the cylindrical body is disposed between the insulating member and the flange of the cylindrical body. The annular spring body is formed in such a dimensional relationship as to elastically deform the portion closer to the inner circumference and the portion closer to the outer circumference toward the opposite sides in the axial direction, and in the direction in which the sealing material is compressed by the elastic deformation of the annular spring body. The insulating member is constantly pressed.
【００１０】この場合、前記絶縁部材は、環状ばね体の
内周寄り部位を押圧し、前記筒体のフランジは環状ばね
体の外周寄り部位を押圧し、該環状ばね体は、その内周
寄り部位が後端側に外周寄り部位が先端側に向けて弾性
変形して配置されるようにするとよい。或いはこれと逆
に、前記絶縁部材は、環状ばね体の外周寄り部位を押圧
し、前記筒体のフランジは環状ばね体の内周寄り部位を
押圧し、該環状ばね体は、その外周寄り部位が後端側に
内周寄り部位が先端側に向けて弾性変形して配置される
ようにしてもよい。In this case, the insulating member presses a portion closer to the inner periphery of the annular spring body, and the flange of the cylindrical body presses a portion closer to the outer periphery of the annular spring body. It is preferable that the part is located on the rear end side and the part close to the outer periphery is elastically deformed and disposed toward the front end side. Or, conversely, the insulating member presses a portion closer to the outer periphery of the annular spring body, the flange of the cylindrical body presses a portion closer to the inner periphery of the annular spring body, and the annular spring body presses the portion closer to the outer periphery. However, a portion closer to the inner circumference may be elastically deformed toward the front end side.
【００１１】具体的には、前者は、絶縁部材の後端面側
が環状ばね体の先端面側の内周寄り部位を、フランジの
先端面側が環状ばね体の後端面側の外周寄り部位をそれ
ぞれ軸方向に押圧するような寸法関係にあることで達成
される。また後者は、これと逆に、絶縁部材の後端面側
が環状ばね体の先端面側の外周寄り部位を、フランジの
先端面側が環状ばね体の後端面側の内周寄り部位をそれ
ぞれ押圧するような寸法関係にあることで達成される。
なお、環状ばね体の材質は、耐熱性やばね性に優れるも
のから選択すればよいが、例えば、ステンレス鋼やイン
コネル、或いはハステロイ等が適用でき、ＳＵＳ３０
４、ＳＵＳ３１０、ＳＵＳ３１６、ＳＵＳ４３０等が実
用上適切である。なお、環状ばね体は、ばね性を有する
環状体であればよく、無端のものが好ましいが、輪の一
部を欠いたばね座金状の有端のものでもよい。More specifically, in the former, the rear end face of the insulating member is axially shifted to the inner peripheral portion on the distal end face side of the annular spring body, and the distal end face side of the flange is axially shifted to the outer peripheral portion on the rear end face side of the annular spring body. This is achieved by the dimensional relationship of pressing in the direction. Conversely, in the latter, the rear end surface side of the insulating member presses the outer peripheral portion on the distal end surface side of the annular spring body, and the distal end surface side of the flange presses the inner peripheral portion on the rear end surface side of the annular spring body. This is achieved by having a proper dimensional relationship.
The material of the annular spring body may be selected from materials having excellent heat resistance and spring properties. For example, stainless steel, Inconel, Hastelloy, or the like can be used.
4, SUS310, SUS316, SUS430 and the like are practically appropriate. Note that the annular spring body may be an annular body having spring properties, and is preferably an endless body, but may be a spring washer-shaped end body lacking a part of a ring.
【００１２】上記の手段により、本発明においては、常
時、環状ばね体のばね性によりシール材を圧縮する方向
に絶縁部材が押圧されている。したがって、高温雰囲気
にさらされてシール材に焼結が生じて体積収縮が生じた
り、金具本体が熱膨張したりして、シール材に弛緩が生
じるような場合でも、常時、シール材の圧縮が確保され
るから、金具本体と素子との間の先端側のシール性の低
下が防止される。According to the present invention, the insulating member is constantly pressed in the direction of compressing the sealing material by the resiliency of the annular spring body. Therefore, even when the sealing material is exposed to a high-temperature atmosphere, sintering occurs, the volume shrinks, or the fitting body thermally expands, so that the sealing material is loosened. As a result, a reduction in the sealing performance at the distal end side between the metal fitting body and the element is prevented.
【００１３】[0013]
【発明の実施の形態】本発明に係るガスセンサを具体化
した実施形態例について、図１ないし図５を参照して詳
細に説明する。図中１は本例のセンサであって、金具本
体２はＳＵＳ４３０からなり、先端側（図下側）の内周
に内向きに突出するとともに先細りテーパをなす内周段
部３が周設され、内周段部３の後端（図上）部寄りには
同径の円筒内周面４が形成され、その後端寄り部位に
は、テーパ面５を介して円筒内周面４より拡径されると
ともに薄肉部６を介して拡径部７を備えており、本体２
はその内周面が後端側２ｂから先端側２ａに向かって同
軸状で縮径する段付き円筒状をなしている。なお拡径部
７の後端部の周縁８は薄肉に形成されている。また、本
体２の外周には、排気ガス管Ｈへの取付け用の六角フラ
ンジ９を備えていると共に、下部外周には取付けねじ１
０を備えており、金属製のガスケット１１を介して排気
ガス管Ｈに螺締されるように構成されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a gas sensor according to the present invention will be described in detail with reference to FIGS. In the figure, reference numeral 1 denotes a sensor of the present example, and a metal fitting body 2 is made of SUS430, and an inner peripheral stepped portion 3 which protrudes inward and forms a tapered taper on the inner periphery on the distal end side (lower side in the figure) is provided. A cylindrical inner peripheral surface 4 of the same diameter is formed near the rear end (on the figure) of the inner peripheral step portion 3, and the diameter of the cylindrical inner peripheral surface 4 is increased from the cylindrical inner peripheral surface 4 via a tapered surface 5 at the rear end. The main body 2 is provided with an enlarged diameter portion 7 through a thin portion 6.
Has a stepped cylindrical shape whose inner peripheral surface is coaxially reduced in diameter from the rear end side 2b toward the front end side 2a. The peripheral edge 8 at the rear end of the enlarged diameter portion 7 is formed to be thin. A hexagonal flange 9 for attachment to the exhaust gas pipe H is provided on the outer periphery of the main body 2, and a mounting screw 1 is provided on the lower periphery.
0, and is configured to be screwed to the exhaust gas pipe H via a metal gasket 11.
【００１４】さて、この本体２の内側の内周段部３に
は、後端側からリング状の金属製の平パッキン１２が入
れられ、その上に、上部内周が凹部１３をなすリング
（円筒）状のアルミナ等からなる絶縁座部材１４が挿入
されている。そして、本体２の内側中央には、先端閉塞
状で筒状をなす検出素子１５がその先端１５ａ側から同
軸状に内挿され、その略中央外周に外向きに突出するよ
う周設された外周凸部（フランジ）１６を絶縁座部材１
４の上部内周の凹部１３に金属製のリング平パッキン１
７を介して係合している。A ring-shaped metal flat packing 12 is inserted into the inner peripheral step 3 inside the main body 2 from the rear end side, and a ring (in which the upper inner periphery forms a concave portion 13) is placed thereon. A cylindrical insulating member 14 made of alumina or the like is inserted. At the center of the inside of the main body 2, a detection element 15 having a closed end and having a cylindrical shape is coaxially inserted from the front end 15 a side thereof, and is provided on an outer periphery thereof so as to protrude outward at a substantially central outer periphery. The protrusion (flange) 16 is attached to the insulating seat member 1.
Metal ring flat packing 1
7 are engaged.
【００１５】こうして形成された、金具本体２の円筒内
周面４と検出素子１５の外周面との間であって、検出素
子１５の外周凸部１６より後端側には略一定幅の円環状
の空隙が形成され、この空隙には、本例では滑石などか
らなるシール材１８が所定量充填され、そのシール材１
８より後端側には円筒状のセラミックなどからなる絶縁
部材１９が同軸状に内挿されている。この絶縁部材１９
の後端側（上部）外周はやや厚肉に形成され、本体２の
拡径部７の内周面７ａとの間に所定の幅の環状空間を形
成している。A circle having a substantially constant width is formed between the inner circumferential surface 4 of the metal fitting body 2 and the outer circumferential surface of the detecting element 15 and formed on the rear end side of the outer circumferential projection 16 of the detecting element 15. An annular space is formed, and the space is filled with a predetermined amount of a sealing material 18 made of talc or the like in this example.
An insulating member 19 made of a cylindrical ceramic or the like is inserted coaxially on the rear end side from the position 8. This insulating member 19
The outer periphery of the rear end side (upper part) is formed to be slightly thicker, and forms an annular space having a predetermined width between the outer peripheral surface 7 a of the enlarged diameter portion 7 of the main body 2.
【００１６】そして、金具本体２の拡径部７の内側であ
って絶縁部材１９の後端面２０にはＳＵＳ４３０などの
ばね性の高い金属からなり一定厚さ、一定幅で円環板状
（平座金形状）に形成された環状ばね体２１が同軸状に
配置されている。ただし、環状ばね体２１は、その内径
Ｄｋ１が絶縁部材１９の後端面２０の内径Ｄｚ１より大
径とされて、素子１５との間に円環状の空隙が保持され
ている。また、環状ばね体２１の外径Ｄｋ２は、絶縁部
材１９の後端面２０の外径Ｄｚ２より大径とされ、環状
ばね体２１の外周面が金具本体２の拡径部７の内周面７
ａに近接している。しかして、絶縁部材１９の後端面２
０は、環状ばね体２１の先端面２２の内周寄り部位に当
接しており、環状ばね体２１が絶縁部材１９を軸方向の
先端側に押圧するように配置されている。ただし、本例
では、絶縁部材１９の後端面２０が、環状ばね体２１の
内周寄りの約１／２の幅部位に当接するように設定され
ている。The rear end face 20 of the insulating member 19 inside the enlarged diameter portion 7 of the metal fitting body 2 is made of a highly springy metal such as SUS430, and has an annular plate shape (flat shape) with a constant thickness and a constant width. An annular spring body 21 formed in a washer shape) is coaxially arranged. However, the inner diameter Dk1 of the annular spring body 21 is larger than the inner diameter Dz1 of the rear end face 20 of the insulating member 19, and an annular gap is held between the annular spring body 21 and the element 15. The outer diameter Dk2 of the annular spring body 21 is larger than the outer diameter Dz2 of the rear end face 20 of the insulating member 19, and the outer peripheral surface of the annular spring body 21 is the inner peripheral surface 7 of the enlarged diameter portion 7 of the metal fitting body 2.
a. Thus, the rear end face 2 of the insulating member 19
Numeral 0 is in contact with a portion of the distal end surface 22 of the annular spring body 21 near the inner periphery, and the annular spring body 21 is disposed so as to press the insulating member 19 toward the distal end side in the axial direction. However, in the present example, the rear end face 20 of the insulating member 19 is set so as to abut on a half width portion of the annular spring body 21 near the inner periphery.
【００１７】さらに、本体２の拡径部７の内側であって
環状ばね体２１の後端面２３側には円筒状の筒体２４が
金具本体２の拡径部７の内周面７ａと同軸状にして内挿
され、その先端側外周に設けられた一定幅の円形のフラ
ンジ２５の先端面２６を環状ばね体２１の後端面２３の
外周寄り部位に当接し、これを軸方向で先端側に押圧す
るように配置されている。ただし、筒体２４のフランジ
寄り部位（近傍）の内径Ｄｆ１は、環状ばね体２１の内
径Ｄｋ１より大径とされかつ絶縁部材１９の後端面２０
の外径Ｄｚ２と略同径とされ、さらにフランジ２５の外
径Ｄｆ２は環状ばね体２１の外径Ｄｋ２と略同径とされ
ている。なおフランジ２５は、筒体２４の先端を外側に
所定の幅でもって略直角に突出するようにプレス成形さ
れており、組み立て後において、フランジ２５の先端面
２６のうち、外周寄り部位の１／２〜２／３程度の幅部
位が環状ばね体２１の外周寄り部位に当接するように設
定するとよい。Further, a cylindrical cylinder 24 is coaxial with the inner peripheral surface 7a of the enlarged diameter portion 7 of the metal fitting main body 2 inside the enlarged diameter portion 7 of the main body 2 and on the rear end surface 23 side of the annular spring body 21. The distal end surface 26 of a circular flange 25 having a constant width provided on the outer periphery at the distal end of the annular spring body 21 is brought into contact with a portion near the outer periphery of the rear end surface 23 of the annular spring body 21, and this is axially moved toward the distal end. It is arranged so as to press. However, the inner diameter Df1 of the portion (near the flange) of the cylindrical body 24 is larger than the inner diameter Dk1 of the annular spring body 21 and the rear end face 20 of the insulating member 19 is formed.
The outer diameter Df2 of the flange 25 is substantially the same as the outer diameter Dk2 of the annular spring body 21. The flange 25 is press-formed so that the distal end of the cylindrical body 24 projects outward at a substantially right angle with a predetermined width. It may be set so that a width portion of about 2/3 is in contact with a portion of the annular spring body 21 near the outer periphery.
【００１８】そして、本例では図４に示したように、筒
体２４のフランジ２５の後端面側の隅角に断面小判形状
のＳＵＳ４３０製リングパッキン２７を介装し、金具本
体２の拡径部７の後端部の周縁８をそのリングパッキン
２７を覆うように内側に折り曲げると同時に所定荷重で
圧縮してかしめたものである。図４は、かしめ前の状態
を示しており、同図に示したようなダイスＤＳが図中矢
印で示した軸方向に移動されることにより前記周縁８が
圧縮されかしめられる。なお、かしめ時においては本体
２の薄肉部６の周方向に沿う部位を本例では１０００℃
程度に加熱し、軸方向へ圧縮変形させている。In this embodiment, as shown in FIG. 4, a ring packing 27 made of SUS430 having an oval cross section is interposed at a corner on the rear end surface side of the flange 25 of the cylindrical body 24, and the diameter of the metal fitting body 2 is increased. The peripheral edge 8 at the rear end of the portion 7 is bent inward so as to cover the ring packing 27 and, at the same time, is compressed and caulked with a predetermined load. FIG. 4 shows a state before caulking, and the peripheral edge 8 is compressed and caulked by moving the die DS as shown in the figure in the axial direction indicated by the arrow in the figure. At the time of caulking, the portion along the circumferential direction of the thin portion 6 of the main body 2 is set at 1000 ° C. in this example.
It is heated to the extent and compressed and deformed in the axial direction.
【００１９】しかして、この圧縮、かしめにより、環状
ばね体２１及び絶縁部材１９を介してシール材１８が軸
方向に圧縮され、素子１５を金具本体２に同軸状に固着
すると同時にシール材１８の横方向への弾性（応力）に
より、金具本体２の内周面と検出素子１５との間の先端
側におけるシール性が保持されている。なお、この圧縮
により、絶縁部材１９は相対的に環状ばね体２１の内周
寄り部位（図５の１点鎖線より内側）を後端面側に押圧
し、筒体２４のフランジ２５は環状ばね体２１の外周寄
り部位（図５の２点鎖線より外側）を先端面側に押圧す
ることから、環状ばね体２１は、その断面視、その内周
寄り部位が後端側に、外周寄り部位が先端側に向けて弾
性変形する（図２，３参照）。なお、この圧縮、かしめ
と同時に金具本体２と筒体２４のフランジ２５との間に
ついてもリングパッキン２７の変形により、一応のシー
ルが確保されている。By this compression and caulking, the sealing material 18 is axially compressed via the annular spring body 21 and the insulating member 19, and the element 15 is coaxially fixed to the metal fitting body 2 and at the same time, the sealing material 18 Due to the elasticity (stress) in the lateral direction, the sealing property on the distal end side between the inner peripheral surface of the fitting main body 2 and the detection element 15 is maintained. Due to this compression, the insulating member 19 relatively presses the portion (inner than the alternate long and short dash line in FIG. 5) of the annular spring body 21 toward the rear end face, and the flange 25 of the cylindrical body 24 is Since the outer peripheral portion (outside of the two-dot chain line in FIG. 5) of the outer peripheral portion 21 is pressed toward the distal end surface, the annular spring body 21 has the inner peripheral portion closer to the rear end side and the outer peripheral portion has the outer peripheral portion. It is elastically deformed toward the tip side (see FIGS. 2 and 3). At the same time as the compression and caulking, a temporary seal is secured between the metal fitting body 2 and the flange 25 of the cylindrical body 24 by the deformation of the ring packing 27.
【００２０】しかして、この工程の後、金具本体２の先
端側に保護キャップ３１を装着し、要すれば加熱用のセ
ラミックヒータ３２を内挿し、また各々のリード線３３
の接続をするなどし、さらに、筒体２４の上端部外側
に、保護外筒３４を外嵌して径方向に絞り込む（かしめ
る）などして製品（酸素センサ）として完成する。After this step, a protective cap 31 is attached to the tip end of the metal fitting body 2, and if necessary, a ceramic heater 32 for heating is inserted.
In addition, a protective outer cylinder 34 is externally fitted to the outside of the upper end portion of the cylindrical body 24 and narrowed down (caulked) in the radial direction to complete the product (oxygen sensor).
【００２１】このように組み立てられた本例のセンサに
おいては、絶縁部材１９の後端面２０が環状ばね体２１
の内周寄り部位を後端面側に押圧し、筒体２４のフラン
ジ２５の先端面２６が環状ばね体２１の外周寄り部位を
先端面側に押圧しており、環状ばね体２１は各押圧方向
に向かうように弾性変形しており、したがって、この環
状ばね体２１の弾性変形によるばね作用によって、シー
ル材１８を圧縮する方向に絶縁部材１９を常時押圧して
いる。すなわち、環状ばね体２１の弾性によるバックア
ップ作用により、シール材１８は常時圧縮力を受けてい
ることから、その分、シール性が高いものとなってい
る。したがって例えば、シール材１８に焼結が生じて体
積収縮が生じたり金具本体２が熱膨張したりした場合に
は、同時に絶縁部材１９が環状ばね体２１の弾性変形に
より軸方向に押し込まれることから、シール材１８に弛
緩が生じることが防止される。したがって、金具本体２
と検出素子１５との間の先端側におけるシール性の劣化
防止が図られる。In the sensor of this embodiment assembled in this manner, the rear end face 20 of the insulating member 19 is
Of the annular body 21 is pressed toward the rear end face, the distal end face 26 of the flange 25 of the cylindrical body 24 is pressing the outer circumferential part of the annular spring body 21 toward the distal end face. Therefore, the insulating member 19 is constantly pressed in the direction of compressing the seal member 18 by the spring action of the annular spring body 21 due to the elastic deformation. That is, since the sealing member 18 is constantly subjected to a compressive force due to the backup effect by the elasticity of the annular spring body 21, the sealing property is correspondingly high. Therefore, for example, when sintering occurs in the sealing material 18 and volume contraction occurs or the metal fitting body 2 thermally expands, the insulating member 19 is simultaneously pushed in the axial direction by the elastic deformation of the annular spring body 21. This prevents the sealing material 18 from being loosened. Therefore, the metal fitting body 2
The deterioration of the sealing property on the tip side between the sensor and the detection element 15 is prevented.
【００２２】なお、本例では環状ばね体２１は、円環状
で矩形断面（平座金形状）のものを例示したが、その平
面形状や断面形状は別段これに限定されるものではな
い。環状ばね体は、絶縁部材と筒体のフランジとの間に
これらとほぼ同軸状で配置され、絶縁部材と筒体のフラ
ンジによって、その内周寄り部位と外周寄り部位とが軸
方向の互いに反対側に向けて弾性変形させられ、この弾
性変形によってシール材を圧縮する方向に絶縁部材を常
時押圧できるものであればよく、適宜の形状のものを使
用することができる。例示的には、サラばねでもよい
し、前記もしたが有端のばね座金状のものでもよい。ま
た、ばね性を有する環状体であればよく、したがって、
内歯形付又は外歯形付の歯付座金形状であってもよい。
なお、上記実施例では、環状ばね体は絶縁部材と筒体の
フランジにそれぞれ直接当接している場合を例示した
が、その間に別部材を介在させることも可能であるな
ど、本発明はその要旨を逸脱しない範囲で種々設計変更
して具体化できる。In this embodiment, the annular spring body 21 has an annular shape and a rectangular cross section (flat washer shape). However, the planar shape and the cross sectional shape are not particularly limited to this. The annular spring body is disposed substantially coaxially between the insulating member and the flange of the cylindrical body, and the inner circumferential portion and the outer circumferential portion are opposite to each other in the axial direction by the insulating member and the flange of the cylindrical body. Any shape can be used as long as it can be elastically deformed toward the side and can always press the insulating member in the direction in which the sealing material is compressed by the elastic deformation. Illustratively, a spring may be used, or a spring washer having an end as described above may be used. In addition, any annular body having spring properties may be used.
It may have a toothed washer shape with an internal tooth shape or an external tooth shape.
In the above-described embodiment, the case where the annular spring body is in direct contact with the insulating member and the flange of the cylindrical body, respectively, is exemplified. However, the present invention has the gist that another member can be interposed therebetween. Various design changes can be made without departing from the scope.
【００２３】因みに、シール材としては、上記例では粉
末滑石を主成分とするものを用いたが、このシール材と
しては、適度な耐熱性と圧縮時の弾性によるシール保持
性能を有するものであれば、これ以外のものでもよい。
具体的には、セメント、硝子、セラミック（アルミナ
等）などの粉体である。なお、ガスセンサは、上記セラ
ミックヒータ付きのもので具体化した場合を例示した
が、本発明は当然のことながら、このヒータの有無にか
かわらず、広く適用できる。As the sealing material, a material mainly composed of powdered talc was used in the above-mentioned example. However, any sealing material having a suitable heat resistance and a seal holding performance due to elasticity at the time of compression is used. Others may be used.
Specifically, it is a powder of cement, glass, ceramic (such as alumina). Although the gas sensor is embodied with a ceramic heater, the present invention is naturally applicable to a wide range of gas sensors regardless of the presence or absence of the heater.
【００２４】さて次に、上記の構造のセンサ１について
そのシール性能を試験した。ただし、試料（２個）は、
筒体２４の内径Ｄｆ１が１２．２ｍｍ、フランジ２５の
外径Ｄｆ２が１５．８ｍｍ、絶縁部材１９の後端面２０
の内径Ｄｚ１が７．７ｍｍ、同外径Ｄｚ２が１２．６ｍ
ｍである。そして、環状ばね体（材質はＳＵＳ４３０）
２１の内径Ｄｋ１は９．７ｍｍ、外径Ｄｋ２は１５．７
ｍｍ、そして厚さＴは１．５ｍｍである。なお試料をな
す本体２の後端部の周縁８の圧縮、かしめ時の力（荷
重）は、２．５ｔｏｎである。Next, the sealing performance of the sensor 1 having the above structure was tested. However, the samples (two)
The inner diameter Df1 of the cylindrical body 24 is 12.2 mm, the outer diameter Df2 of the flange 25 is 15.8 mm, and the rear end face 20 of the insulating member 19.
Has an inner diameter Dz1 of 7.7 mm and an outer diameter Dz2 of 12.6 m.
m. And an annular spring body (material is SUS430)
21 has an inner diameter Dk1 of 9.7 mm and an outer diameter Dk2 of 15.7.
mm, and the thickness T is 1.5 mm. The force (load) at the time of compression and crimping of the peripheral edge 8 at the rear end of the main body 2 forming the sample is 2.5 ton.
【００２５】また、試験内容は、試料をなす金具本体２
の温度を７００℃に保持し、４００時間に至るまでの同
本体２と検出素子１５との間の先端側におけるシール性
の低下を測定したものである。ただし、その測定は試料
を５０時間或いは１００時間ごとに常温にもどし、使用
条件にならう模擬排気管にその本体２の取付けねじ１０
を介して螺締し、模擬排気管の内側に６ｋｇ／ｃｍ2 空
圧をかけて本体２と検出素子と１５の間の先端側におけ
るリーク量を測定した。結果は図６に示した通りであ
る。なお、比較例は、本発明のようなばね作用のある環
状ばね体２１の代わりにそのようなばね作用のない図
８，９に示した構造のものであるが、圧縮、かしめ力な
ど本試験に本質的に影響するような他の設計製造条件
は、上記試料と同じである。なお、筒体の内径Ｄｆ１が
９．８ｍｍ、フランジの外径Ｄｆ２が１２．６ｍｍ、絶
縁部材の後端面の内径Ｄｚ１が７．７ｍｍ、同外径Ｄｚ
２が１２．６ｍｍである。そして、環状パッキン（材質
はＳＵＳ４３０）の内径Ｄｋ１は９．０ｍｍ、外径Ｄｋ
２は１２．６ｍｍ、厚さＴ：１ｍｍである。The test contents are as follows:
Is maintained at 700 ° C., and a decrease in the sealing property at the distal end side between the main body 2 and the detection element 15 up to 400 hours is measured. However, for the measurement, the sample was returned to normal temperature every 50 hours or 100 hours, and the mounting screw 10 of the main body 2 was attached to the simulated exhaust pipe according to the use conditions.
, And a pneumatic pressure of 6 kg / cm 2 was applied to the inside of the simulated exhaust pipe to measure the amount of leak at the tip side between the main body 2 and the detection element 15. The results are as shown in FIG. The comparative example has a structure shown in FIGS. 8 and 9 without such a spring action instead of the annular spring body 21 having a spring action as in the present invention. The other design manufacturing conditions that essentially affect the above are the same as those of the above sample. The inner diameter Df1 of the cylindrical body is 9.8 mm, the outer diameter Df2 of the flange is 12.6 mm, the inner diameter Dz1 of the rear end face of the insulating member is 7.7 mm, and the outer diameter Dz is the same.
2 is 12.6 mm. The inner diameter Dk1 of the annular packing (material is SUS430) is 9.0 mm, and the outer diameter Dk is
2 has a thickness of 12.6 mm and a thickness T of 1 mm.
【００２６】図６に示されるように、比較例は、１５０
時間経過後はいずれにおいても、約１００ｃｃ／ｍｉｎ
のリークがあったのに対して、上記試料（本発明品）で
は、４００時間経過後の試験でも１ｃｃ／ｍｉｎ以下の
リークであり、シール性能の問題となる低下はなかっ
た。また、試験開始前のリークについても本例のものは
比較例のものに比べて著しく小さいことが分かる。これ
らの結果は、とりもなおさず本発明の効果を実証するも
のである。なお、気密性が低下し、約１０ｃｃ／ｍｉｎ
以上のリークがあると、排気ガスが素子の内側に入り込
み、センサの出力が低下する不具合が発生し、酸素濃度
の検出が不可能となる。しかして本例のものでは、７０
０℃の環境下でも使用できることを意味する。因みに、
比較例は６５０℃で上記の試験を行った場合には、４０
０時間経過後もシール性の低下に問題はなかった。As shown in FIG.
After the lapse of time, about 100 cc / min
In contrast, in the above-mentioned sample (product of the present invention), the leak was 1 cc / min or less even in the test after the elapse of 400 hours, and there was no decrease in the sealing performance. Also, it can be seen that the leak of the present example was significantly smaller than that of the comparative example before the test was started. These results demonstrate the effect of the present invention. In addition, the airtightness is reduced to about 10 cc / min.
If there is such a leak, the exhaust gas enters the inside of the element, causing a problem that the output of the sensor is reduced, and the oxygen concentration cannot be detected. In this example, 70
This means that it can be used even at 0 ° C. By the way,
In the comparative example, when the above test was performed at 650 ° C., 40
Even after 0 hours, there was no problem in lowering the sealing performance.
【００２７】図７は、本発明を具体化した別の形態例の
要部を示すものである。ただし、このものは、絶縁部材
１９の後端面２０のうちの外周寄り部位が後端面側に向
けて所定の幅でもって***されており、その***部２０
ａの後端面２０ｂが、環状ばね体２１の先端面２２の外
周寄り部位（図５の２点鎖線より外側）を押圧し、筒体
２４のフランジ２５の先端面２６が、環状ばね体２１の
後端面２３の内周寄り部位（図５の１点鎖線より内側）
を押圧するような寸法関係に形成されており、環状ばね
体２１を、その外周寄り部位が後端側に、内周寄り部位
が先端側にそれぞれ弾性変形して配置されている点のみ
が相違するだけであり、前例と基本的に異なるところは
ないので、同一の部位には、同一の符号を付すに止め
る。本例では、本体２の後端部の周縁８の曲げ長さ
（幅）が大きくなるが、筒体２４の径を小さくできる。FIG. 7 shows a main part of another embodiment embodying the present invention. In this case, however, a portion of the rear end face 20 of the insulating member 19 near the outer periphery is raised with a predetermined width toward the rear end face side.
The rear end face 20 a of the cylindrical body 24 presses a portion (outside of the two-dot chain line in FIG. 5) of the distal end face 22 of the annular spring body 21, and the distal end face 26 of the flange 25 of the tubular body 24 A portion near the inner periphery of the rear end face 23 (inside of the dashed line in FIG. 5)
The only difference is that the annular spring body 21 is arranged by elastically deforming the portion closer to the outer periphery to the rear end side and the portion closer to the inner periphery to the front end side. Since there is no difference from the previous example, the same reference numerals are used for the same parts. In this example, the bending length (width) of the peripheral edge 8 at the rear end of the main body 2 increases, but the diameter of the cylindrical body 24 can be reduced.
【００２８】[0028]
【発明の効果】本発明によれば、以上の説明から明らか
なように、環状ばね体のばね性により粉末状のシール材
を圧縮する方向に絶縁部材が常時、押圧されている。し
たがって、例えば、シール材に一部焼結が生じて体積収
縮が生じたり金具本体が熱膨張した場合には、同時に絶
縁部材が環状ばね体の弾性変形により軸方向に押し込ま
れるから、粉末状のシール材の弛緩が防止され、金具本
体と検出素子との間の先端側におけるシール性能の劣化
防止に有効である。この結果、長期間にわたって素子内
面側の基準酸素ガス（大気）が汚染されにくい。したが
って、酸素濃度の検知能力の低下や内面電極層の腐食が
防止され、寿命の長い信頼性の高いガスセンサとなすこ
とができる。さらに、従来のものより気密性の劣化が小
さいため、より高温度雰囲気となる排気ガス管の上流へ
の取着が可能となり、その分、酸素濃度の検出の応答性
及び正確性の向上が図られる。According to the present invention, as is apparent from the above description, the insulating member is constantly pressed in the direction of compressing the powdery sealing material due to the resiliency of the annular spring body. Therefore, for example, when the sealing material partially sinters to cause volume contraction or thermal expansion of the metal fittings, the insulating member is simultaneously pushed in the axial direction by the elastic deformation of the annular spring body. The loosening of the sealing material is prevented, which is effective for preventing the deterioration of the sealing performance at the distal end side between the fitting main body and the detecting element. As a result, the reference oxygen gas (atmosphere) on the inner surface side of the element is less likely to be contaminated for a long period of time. Accordingly, a decrease in the ability to detect the oxygen concentration and corrosion of the inner electrode layer are prevented, and a highly reliable gas sensor having a long life can be obtained. Furthermore, since the deterioration of the airtightness is smaller than that of the conventional one, it is possible to attach the exhaust gas pipe at a higher temperature to the upstream of the exhaust gas pipe, thereby improving the response and accuracy of the oxygen concentration detection. Can be
【図１】本発明に係るガスセンサの実施形態例の縦断正
面図。FIG. 1 is a longitudinal sectional front view of an embodiment of a gas sensor according to the present invention.
【図２】図１のＡ部を示す拡大図。FIG. 2 is an enlarged view showing a portion A in FIG. 1;
【図３】図２のＢ部を示す拡大図。FIG. 3 is an enlarged view showing a portion B in FIG. 2;
【図４】図３の部分の圧縮かしめ前の図。FIG. 4 is a diagram of the portion of FIG. 3 before compression caulking;
【図５】環状ばね体の平面図及びこれに対する絶縁部材
と筒体のフランジの当接面を説明する図。FIG. 5 is a plan view of an annular spring body and a view for explaining an abutting surface of an insulating member and a flange of a cylindrical body against the annular spring body;
【図６】シール性能の試験結果を示すグラフ。FIG. 6 is a graph showing test results of sealing performance.
【図７】別の実施形態例を示す要部拡大断面図。FIG. 7 is an enlarged sectional view of a main part showing another embodiment.
【図８】従来のガスセンサの一部破断縦断正面図。FIG. 8 is a partially cutaway longitudinal front view of a conventional gas sensor.
【図９】図８のＣ部を示す拡大図。FIG. 9 is an enlarged view showing a part C in FIG. 8;
１ ガスセンサ ２ 金具本体 ３ 内周段部 ８ 金具本体の後端部の周縁 １５ 検出素子 １６ 外周凸部 １８ シール材 １９ 絶縁部材 ２１ 環状ばね体 ２４ 筒体 ２５ フランジ DESCRIPTION OF SYMBOLS 1 Gas sensor 2 Metal fitting main body 3 Inner peripheral step part 8 Peripheral edge of rear end part of metal fitting main body 15 Detection element 16 Outer peripheral convex part 18 Sealing material 19 Insulating member 21 Ring spring body 24 Cylindrical body 25 Flange
───────────────────────────────────────────────────── フロントページの続き (72)発明者 古崎 圭三 名古屋市瑞穂区高辻町14番18号 日本特 殊陶業株式会社内 (58)調査した分野(Int.Cl.7，ＤＢ名) G01N 27/409 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Keizo Furusaki 14-18 Takatsuji-cho, Mizuho-ku, Nagoya Japan Special Ceramics Co., Ltd. (58) Field surveyed (Int. Cl. 7 , DB name) G01N 27 / 409
Claims (4)
部が周設された筒状の金具本体の内側に、外周に外向き
に突出する外周凸部が周設された検出素子が、該検出素
子の先端側から同軸状に内挿されて該外周凸部を前記内
周段部に絶縁を保持して係合され、前記金具本体の内周
面と該検出素子の外周面との間であって、該検出素子の
外周凸部より後端側にはシール材が充填され、該シール
材より後端側にはリング状の絶縁部材が同軸状に内挿さ
れ、さらに端部外周にフランジが周設された筒体が、そ
のフランジで前記絶縁部材を先端側に押圧するように同
軸状に内挿され、該金具本体の後端部の周縁が内側に折
り曲げられて該フランジを覆うと共に、前記シール材を
軸方向に圧縮する構造のガスセンサにおいて、前記絶縁
部材と前記筒体のフランジとの間に、これらとほぼ同軸
状でばね性を有する環状ばね体が配置され、しかも、前
記絶縁部材と前記筒体のフランジは、該環状ばね体の内
周寄り部位と外周寄り部位とを軸方向の互いに反対側に
向けて弾性変形させるような寸法関係に形成され、この
環状ばね体の弾性変形によって前記シール材を圧縮する
方向に前記絶縁部材を常時押圧してなることを特徴とす
るガスセンサ。1. A detection in which an outer peripheral convex portion projecting outward on the outer periphery is provided inside a cylindrical metal fitting body provided with an inner peripheral step portion projecting inward on the inner periphery on the distal end side. An element is coaxially inserted from the distal end side of the detection element, and the outer peripheral projection is engaged with the inner peripheral step while maintaining insulation, and an inner peripheral surface of the metal fitting body and an outer periphery of the detection element are attached. Between the surface and the rear end side of the outer peripheral convex portion of the detection element is filled with a sealing material, and a ring-shaped insulating member is coaxially inserted on the rear end side of the sealing material, A cylindrical body provided with a flange on the outer periphery of the end is coaxially inserted so as to press the insulating member toward the distal end side with the flange, and the peripheral edge of the rear end of the metal fitting body is bent inward. In a gas sensor having a structure that covers the flange and compresses the sealing material in the axial direction, the gasket of the insulating member and the cylindrical body may be used. An annular spring body having a spring property and being substantially coaxial with the flange is disposed between the flange and the flange. Further, the insulating member and the flange of the cylindrical body are provided with an inner circumferential portion and an outer circumferential portion of the annular spring body. Are formed so as to elastically deform toward the opposite sides in the axial direction, and the insulating member is constantly pressed in the direction of compressing the sealing material by the elastic deformation of the annular spring body. Gas sensor.
部位を押圧し、前記筒体のフランジは環状ばね体の外周
寄り部位を押圧し、該環状ばね体は、その内周寄り部位
が後端側に外周寄り部位が先端側に向けて弾性変形して
配置されていることを特徴とする請求項１記載のガスセ
ンサ。2. The insulating member presses a portion closer to the inner periphery of the annular spring body, and the flange of the cylindrical body presses a portion closer to the outer periphery of the annular spring body. 2. The gas sensor according to claim 1, wherein a portion closer to the outer periphery is elastically deformed toward the front end side.
部位を押圧し、前記筒体のフランジは環状ばね体の内周
寄り部位を押圧し、該環状ばね体は、その外周寄り部位
が後端側に内周寄り部位が先端側に向けて弾性変形して
配置されていることを特徴とする請求項１記載のガスセ
ンサ。3. The insulating member presses a portion closer to the outer periphery of the annular spring body, and the flange of the cylindrical body presses a portion closer to the inner periphery of the annular spring body. 2. The gas sensor according to claim 1, wherein a portion closer to the inner periphery is elastically deformed toward the front end side at the rear end side.
ることを特徴とする請求項１、２又は３記載のガスセン
サ。4. The gas sensor according to claim 1, wherein the annular spring body is made of stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8188547A JP3029802B2 (en) | 1996-06-26 | 1996-06-26 | Gas sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8188547A JP3029802B2 (en) | 1996-06-26 | 1996-06-26 | Gas sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1010082A JPH1010082A (en) | 1998-01-16 |
| JP3029802B2 true JP3029802B2 (en) | 2000-04-10 |
Family
ID=16225616
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8188547A Expired - Fee Related JP3029802B2 (en) | 1996-06-26 | 1996-06-26 | Gas sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3029802B2 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4643820B2 (en) * | 2000-10-31 | 2011-03-02 | 日本特殊陶業株式会社 | Manufacturing method of gas sensor |
| JP4546640B2 (en) * | 2000-12-11 | 2010-09-15 | 日本特殊陶業株式会社 | Sensor and sensor manufacturing method |
| JP4517526B2 (en) * | 2001-03-28 | 2010-08-04 | 株式会社デンソー | Manufacturing method of gas sensor |
| JP4552351B2 (en) | 2001-05-02 | 2010-09-29 | 株式会社デンソー | Gas sensor hermetic inspection apparatus and inspection method |
| DE10132827A1 (en) * | 2001-07-06 | 2003-01-30 | Bosch Gmbh Robert | Gas sensor |
| JP2003114210A (en) | 2001-07-31 | 2003-04-18 | Denso Corp | Gas sensor |
| CN100516859C (en) * | 2003-05-29 | 2009-07-22 | 日本特殊陶业株式会社 | Gas sensor and method of producing the same |
| JP2007271517A (en) | 2006-03-31 | 2007-10-18 | Denso Corp | Gas sensor |
| JP2009002846A (en) * | 2007-06-22 | 2009-01-08 | Denso Corp | Gas sensor and its manufacturing method |
| JP5194073B2 (en) * | 2010-08-10 | 2013-05-08 | 日本特殊陶業株式会社 | Gas sensor |
| JP2019045368A (en) * | 2017-09-05 | 2019-03-22 | 日本特殊陶業株式会社 | Gas sensor |
| JP7115436B2 (en) | 2019-07-31 | 2022-08-09 | 株式会社デンソー | gas sensor |
-
1996
- 1996-06-26 JP JP8188547A patent/JP3029802B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1010082A (en) | 1998-01-16 |
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