JPH09257743A - Sensor plug - Google Patents
Sensor plugInfo
- Publication number
- JPH09257743A JPH09257743A JP8069809A JP6980996A JPH09257743A JP H09257743 A JPH09257743 A JP H09257743A JP 8069809 A JP8069809 A JP 8069809A JP 6980996 A JP6980996 A JP 6980996A JP H09257743 A JPH09257743 A JP H09257743A
- Authority
- JP
- Japan
- Prior art keywords
- caulking
- cylinder
- sleeve tube
- holder
- flange
- 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.)
- Granted
Links
Landscapes
- Measuring Oxygen Concentration In Cells (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、高温度で使用さ
れるセンサープラグの一体性の向上に関する。TECHNICAL FIELD This invention relates to improving the integrity of sensor plugs used at high temperatures.
【０００２】[0002]
【従来の技術】エンジンの排気路に装着されて排気中の
残存酸素量を検出するための酸素センサーなどのセンサ
ーは、プラグ（栓）構造を有しており、排気路に設けら
れたネジ穴などに締結して取り付けられる。このセンサ
ープラグは、図４に示す如く、内部に係合段１０を有し
端部にかしめ筒部５４が設けられた筒状主体金具１内
に、検出素子２を支持するとともに、外周に前記係合段
１０に係合する鍔部３２が形成された筒状のセラミック
ス製ホルダー３を同軸的に嵌着した構成を有する。2. Description of the Related Art A sensor such as an oxygen sensor mounted on an exhaust passage of an engine to detect the amount of oxygen remaining in the exhaust has a plug structure, and a screw hole provided in the exhaust passage. It can be attached by fastening to. As shown in FIG. 4, this sensor plug supports the detection element 2 in a tubular metal shell 1 having an engaging step 10 inside and a caulking tubular portion 54 provided at an end thereof, and has the above-described outer periphery. It has a configuration in which a cylindrical ceramic holder 3 in which a flange portion 32 that engages with the engagement step 10 is formed is coaxially fitted.
【０００３】ホルダー３の外周と主体金具１の内周との
間には、ホルダー３と主体金具１との軸心を一致させる
ための支持筒７を介装させ、一端にフランジ部４２を設
けた袖管４の該フランジ部４２を前記支持筒７に同軸的
に突き合わせて配置している。これらは、かしめ筒部５
４を内側に縮径するようにかしめることにより、該かし
め筒部５４と前記係合段１０と間にホルダー３および前
記フランジ部４２を一体的に固着して組み付けられてい
る。Between the outer circumference of the holder 3 and the inner circumference of the metal shell 1, a support cylinder 7 for aligning the axes of the holder 3 and the metal shell 1 is interposed, and a flange portion 42 is provided at one end. The flange portion 42 of the sleeve tube 4 is coaxially butted with the support cylinder 7. These are the caulking cylinder 5
The holder 3 and the flange portion 42 are integrally fixed and assembled between the crimping tubular portion 54 and the engaging step 10 by crimping the inner diameter of the inner peripheral portion 4 by crimping.
【０００４】[0004]
【発明が解決しようとする課題】自動車用エンジンでは
冷間始動における暖機特性を向上するために検出素子を
早く活性化温度に昇温させる要請がある。このためにセ
ンサーをエンジンの排気口に近づけて取り付けるなど、
高い温度環境で使用できることが必要になっている。ま
た、早く昇温させるために、センサーに接続されている
リード線から熱伝導による放熱を防ぐことも有効であ
る。In the engine for automobiles, there is a demand to quickly raise the temperature of the detection element to the activation temperature in order to improve the warm-up characteristic in cold starting. For this purpose, attach the sensor close to the exhaust port of the engine,
It is required to be able to be used in a high temperature environment. Further, in order to raise the temperature quickly, it is also effective to prevent the heat radiation from the lead wire connected to the sensor.
【０００５】従来のセンサープラグは、かしめ加工にお
いて、かしめ筒部５４の先端が、袖管４の端部を不均一
に押圧して偏心させたり、または変形させたりして、同
心性または真円度の低下が生じていた。このため、高温
度の使用条件で長期間使用していると、熱歪みなどによ
りかしめ部にゆるみが生じて一体性が損なわれ、気密が
失われる場合があった。In the conventional sensor plug, in the crimping process, the tip of the crimping cylinder portion 54 unevenly presses the end portion of the sleeve tube 4 to cause eccentricity or deformation, which results in concentricity or roundness. Was occurring. For this reason, when used for a long period of time under a high-temperature use condition, the caulking portion may be loosened due to thermal strain or the like, impairing the integrity and losing airtightness.
【０００６】また、高温で使用すると主体金具１から袖
管４を介してコネクター６のゴム部材が高温に長時間晒
され、劣化して気密性が低下し易い。これを避けるため
には、袖管４の肉厚を薄くして主体金具１からコネクタ
ー６への熱伝導量を少なくする対策が有効である。Further, when used at high temperature, the rubber member of the connector 6 is exposed to the high temperature for a long time from the metal shell 1 through the sleeve tube 4, and is deteriorated, so that the airtightness is likely to be lowered. In order to avoid this, it is effective to reduce the thickness of the sleeve tube 4 to reduce the amount of heat conduction from the metal shell 1 to the connector 6.
【０００７】ところが、袖管４の肉厚を薄くすると、主
体金具１と袖管４とをかしめることにより接合する場
合、袖管４の一端側の拡径されたフランジ部４２とその
フランジ部４２に隣接する一端部４１とが、かしめ筒部
５４の縮径かしめの影響を受けて、さらに内径側に異常
変形を起こし易くなり、前記一体性の確保が一層困難に
なる。However, when the sleeve tube 4 is thinned, when the metal shell 1 and the sleeve tube 4 are joined by caulking, the flange portion 42 on one end side of the sleeve tube 4 and the flange portion 42 adjacent to the enlarged diameter portion 42 are adjacent to each other. The one end portion 41 is subject to the influence of the crimping and crimping of the crimping cylindrical portion 54, and the deforming is more likely to occur on the inner diameter side, which makes it more difficult to secure the integrity.
【０００８】センサープラグの一体性が損なわれると、
エンジンや自動車の振動によりホルダーや、ホルダーに
内包された検出素子が破損したり、気密性が損なわれる
と、自動車の下部などの水や泥などが付着し易い場所へ
の装着が困難になり、装着場所の制約が増大する。この
発明の目的は、高温度に晒される使用条件下において長
期間使用しても、袖管と主体金具とのかしめにより固着
部の一体性が確実に維持できるセンサープラグの提供に
ある。If the integrity of the sensor plug is impaired,
If the holder or the detection element enclosed in the holder is damaged by the vibration of the engine or the vehicle, or the airtightness is impaired, it becomes difficult to mount it on the place where water or mud is likely to adhere to the bottom of the vehicle, The restrictions on the mounting place increase. An object of the present invention is to provide a sensor plug capable of reliably maintaining the integrity of a fixed portion by caulking a sleeve tube and a metal shell even when it is used for a long period of time under a condition of being exposed to a high temperature.
【０００９】[0009]
【課題を解決するための手段】請求項１に記載の発明
は、内部に係合段を有し端部にかしめ筒部が設けられた
筒状主体金具内に、検出素子を支持し外周に前記段部に
係合する鍔部が形成された筒状のセラミックス製ホルダ
ーを同軸的に嵌め込み、前記ホルダーの外周と主体金具
の内周との間に支持筒を介装させ、一端にフランジ部を
設けた袖管の該フランジ部を前記支持筒に突き合わせ
て、前記かしめ筒部を内側に減径してかしめることによ
り、該かしめ筒部と前記係合段との間に前記ホルダーお
よび前記フランジ部を一体的に固着したセンサープラグ
において、前記支持筒は、前記袖管の一端部に嵌入する
嵌入筒部と、前記フランジ部に当接する環状当接面とを
有することを特徴とする。According to a first aspect of the present invention, a detecting element is supported in an outer periphery of a tubular metal shell having an engaging step inside and a caulking tubular portion provided at an end thereof. A cylindrical ceramic holder having a flange portion that engages with the stepped portion is coaxially fitted, and a support cylinder is interposed between the outer circumference of the holder and the inner circumference of the metal shell, and a flange portion is provided at one end. The flange portion of the sleeve tube provided with is abutted against the support cylinder, and the caulking cylinder portion is reduced in diameter to be caulked, whereby the holder and the flange are provided between the caulking cylinder portion and the engaging step. In the sensor plug in which the parts are integrally fixed, the support cylinder has a fitting cylinder part that fits into one end of the sleeve tube, and an annular contact surface that contacts the flange part.
【００１０】[0010]
【発明の作用および効果】この発明では、支持筒に設け
た嵌入筒部により袖管の端部が内側から補強されてお
り、かしめ加工においてかしめ筒部の先端が袖管の一端
部を不均一に押圧しても、袖管の一端部が偏心したり、
真円度が低下することを有効に防止できる。このため、
高温度に晒される使用条件下においても、かしめによる
固着部の一体性が維持できる。According to the present invention, the end portion of the sleeve tube is reinforced from the inside by the fitting tube portion provided in the support cylinder, and the tip of the caulking tube portion presses the one end portion of the sleeve tube unevenly during the crimping process. Even if one end of the sleeve tube is eccentric,
It is possible to effectively prevent the roundness from decreasing. For this reason,
Even under the use condition of being exposed to a high temperature, the integrity of the fixed portion due to the caulking can be maintained.
【００１１】請求項２に記載の発明は、内部に係合段を
有し端部にかしめ筒部が設けられた筒状主体金具内に、
検出素子を支持し外周に前記段部に係合する鍔部が形成
された筒状のセラミックス製ホルダーを同軸的に嵌め込
み、前記ホルダーの外周と主体金具の内周との間に支持
筒を介装させ、袖管の一端部を前記支持筒に突き合わせ
て、前記かしめ筒部を内側に減径してかしめることによ
り、該かしめ筒部と前記係合段との間に前記ホルダーお
よび前記フランジ部を一体的に固着したセンサープラグ
において、前記支持筒は、前記袖管の一端部に嵌入する
嵌入筒部と、前記一端部を当接する環状当接面と、該環
状当接面に臨んで前記嵌入筒部の外周に形成した環状凹
所とを有することを特徴とする。この発明においても、
請求項１に記載の発明と同様な作用、効果が得られる。According to a second aspect of the present invention, in a tubular metal shell having an engaging step inside and a caulking tubular portion provided at an end,
A cylindrical ceramic holder, which supports the detection element and is formed with a flange portion that engages with the step portion on the outer circumference, is coaxially fitted, and a supporting cylinder is interposed between the outer circumference of the holder and the inner circumference of the metal shell. By mounting one end of the sleeve tube against the support tube, and reducing the diameter of the caulking tube portion to the inside to caulk, so that the holder and the flange portion are provided between the caulking tube portion and the engaging step. In the sensor plug in which the support tube is integrally fixed, the support tube includes a fitting tube part that fits into one end of the sleeve tube, an annular contact surface that abuts the one end, and the fitting part that faces the annular contact surface. It is characterized by having an annular recess formed on the outer periphery of the tubular portion. In the present invention,
The same operation and effect as the invention according to claim 1 can be obtained.
【００１２】請求項３に記載の発明は、前記フランジと
減径かしめされた前記かしめ筒部との間にはリングパッ
キンが介装されており、前記支持筒の嵌入筒部の長さ
は、少なくとも前記袖管の厚さとリングパッキンの厚さ
の和に設定した。これにより、かしめによる固着部の一
体性が極めて強硬にでき、長期間のメンテナンスフリー
が可能になる。According to a third aspect of the present invention, a ring packing is interposed between the flange and the crimped cylindrical portion whose diameter is reduced, and the length of the fitting cylindrical portion of the support cylinder is At least the sum of the sleeve tube thickness and the ring packing thickness was set. As a result, the integrity of the fixing portion due to the caulking can be made extremely strong, and maintenance-free for a long period of time becomes possible.
【００１３】請求項４に記載の発明は、前記環状当接面
と減径かしめされた前記かしめ筒部との間には、前記袖
管の一端部の外周を囲むリングパッキンが介装されてい
る。これにより、かしめによる固着部の一体性が極めて
強硬にでき、長期間のメンテナンスフリーが可能にな
る。請求項５の構成では、袖管の肉厚が薄いため熱伝導
が少なく、センサープラグに接続されるコネクターなど
に使用されるゴム製または樹脂製部品の熱劣化を低減で
きる。According to a fourth aspect of the present invention, a ring packing surrounding the outer periphery of the one end of the sleeve tube is interposed between the annular abutment surface and the crimped cylindrical portion having the reduced diameter. . As a result, the integrity of the fixing portion due to the caulking can be made extremely strong, and maintenance-free for a long period of time becomes possible. In the structure of claim 5, since the sleeve tube has a small wall thickness, heat conduction is small, and thermal deterioration of rubber or resin parts used for a connector or the like connected to the sensor plug can be reduced.
【００１４】[0014]
【発明の実施の形態】図１は、この発明のセンサープラ
グの一実施例にかかる酸素センサーを示す。酸素センサ
ーは、円筒状の主体金具１内に、棒状を呈する検出素子
２を内包した円筒状の耐熱セラミックス製ホルダー３を
固着してなる。検出素子２は、一端（図示下端、以下同
じ）部がセラミックス多層基板で形成され酸素濃度を検
出するためのヒーター素子付き感ガス素子部２１となっ
ており、他端（図示上端、以下同じ）から複数のリード
線２２が引き出されている。各リード線２２には、金属
端子２３が接続されている。FIG. 1 shows an oxygen sensor according to an embodiment of the sensor plug of the present invention. The oxygen sensor comprises a cylindrical metal shell 1 and a cylindrical heat-resistant ceramic holder 3 having a rod-shaped detection element 2 fixed therein. The detection element 2 has a gas sensing element portion 21 with a heater element, which is formed of a ceramic multilayer substrate at one end (lower end in the drawing, same below), and the other end (upper end in the drawing, same below). A plurality of lead wires 22 are drawn out from. A metal terminal 23 is connected to each lead wire 22.
【００１５】ホルダー３は、外周は一端側部３１に径大
の鍔部３２が設けられた円筒状を有し、内周は一端に内
周縁３３が形成され他端にテーパー部３４が設けられて
いる。検出素子２は、検出素子２の外周とホルダー３の
内周との間に、一端側から、検出素子２の外周に固着さ
れるとともに前記内周縁３３に係合したセラミックス碍
管３５、セラミックス粉体充填層３６、およびセラミッ
クス粉体封着層３７を介装させることによりホルダー３
内に同軸的に固定されている。The holder 3 has a cylindrical shape with an outer periphery having a large-diameter flange portion 32 provided at one end side portion 31, an inner periphery having an inner peripheral edge 33 formed at one end, and a tapered portion 34 provided at the other end. ing. The detection element 2 is fixed between the outer periphery of the detection element 2 and the inner periphery of the holder 3 from one end side to the outer periphery of the detection element 2 and the ceramic porcelain tube 35 engaged with the inner peripheral edge 33 and the ceramic powder. By interposing the filling layer 36 and the ceramic powder sealing layer 37, the holder 3
It is fixed coaxially inside.
【００１６】主体金具１は、一端に後記するプロテクタ
ーが嵌着される径小筒部１１、中間に排気路に設けたネ
ジ穴に締結するためのネジ部１２および六角部１３、後
端に熱かしめによりホルダー３を主体金具１内に保持す
るとともに、袖管４を主体金具１に同軸的に連結するた
めの固着筒部５を有する。固着筒部５は、六角部１３に
連なる基筒部５１、肉薄の縮み筒部５２、中間筒部５
３、および肉薄のかしめ筒部５４からなる。The metal shell 1 has a small-diameter cylindrical portion 11 to which a protector to be described later is fitted at one end, a screw portion 12 and a hexagonal portion 13 for fastening to a screw hole provided in the exhaust passage in the middle, and a heat insulating member at the rear end. The holder 3 is held in the metal shell 1 by caulking, and a fixed tube portion 5 for coaxially connecting the sleeve tube 4 to the metal shell 1 is provided. The fixed tubular portion 5 includes a base tubular portion 51 connected to the hexagonal portion 13, a thin shrinking tubular portion 52, and an intermediate tubular portion 5.
3 and a thin caulking tubular portion 54.
【００１７】主体金具１のネジ部１２と六角部１３との
間は径小に形成され、シールリング１４が外嵌され、径
小筒部１１には、二重構造で通気穴が設けられた円筒キ
ャップ状プロテクター１５が嵌着されている。主体金具
１の内周は、ネジ部１２の内周に位置し、前記ホルダー
３の先端部が遊嵌された小径部１６、前記鍔部３２が嵌
め込まれた中径部１７、および前記固着筒部５の内周を
形成する大径部１８となっており、小径部１６と中径部
１７との間は、前記ホルダーの鍔部３２の一端面に係合
する係合段１０が設けられている。A small diameter is formed between the threaded portion 12 and the hexagonal portion 13 of the metal shell 1, a seal ring 14 is externally fitted, and the small diameter tubular portion 11 is provided with a ventilation hole having a double structure. A cylindrical cap-shaped protector 15 is fitted. The inner circumference of the metal shell 1 is located on the inner circumference of the screw portion 12, and the small diameter portion 16 in which the tip portion of the holder 3 is loosely fitted, the middle diameter portion 17 in which the collar portion 32 is fitted, and the fixed tube. The large-diameter portion 18 forms the inner circumference of the portion 5, and an engagement step 10 that engages with one end surface of the collar portion 32 of the holder is provided between the small-diameter portion 16 and the medium-diameter portion 17. ing.
【００１８】袖管４は、一端部４１に薄肉の金属パイプ
の端部を拡開して設けたフランジ部４２を有し、他端部
４３に複数の矩形凹み４４が周設されている。袖管４の
他端部４３には、コネクター６が嵌着されている。コネ
クター６は、前記複数の矩形凹み４４に係合する内側膨
出部６１が周設された一端部６２を有する外筒６３と、
該外筒６３の他端側内部に嵌着されたゴム製のコネクタ
ー本体６４とからなる。The sleeve tube 4 has a flange portion 42 provided at one end portion 41 by expanding the end portion of a thin-walled metal pipe, and has a plurality of rectangular recesses 44 provided around the other end portion 43. The connector 6 is fitted to the other end 43 of the sleeve tube 4. The connector 6 includes an outer cylinder 63 having an end portion 62 around which an inner bulging portion 61 that engages with the plurality of rectangular recesses 44 is provided,
A rubber connector body 64 is fitted inside the other end of the outer cylinder 63.
【００１９】袖管４は、ステンレス（ＳＵＳ３０４）製
であり、板厚ｔは０．４ｍｍとなっている。この板厚ｔ
は０．２５ｍｍ≦ｔ≦０．６ｍｍであることが望まし
く、更には、０．３ｍｍ≦ｔ≦０．５ｍｍに設定する
と、強度上実用に耐えうる強度を有し熱伝導量も小さく
コネクター本体の熱による劣化も少なくなって好適であ
る。袖管４は、パイプ材を所定の長さに切断して使用し
てもよく、板材を円環状に打ち抜いてプレス成形しても
よい。The sleeve tube 4 is made of stainless steel (SUS304) and has a plate thickness t of 0.4 mm. This plate thickness t
Is preferably 0.25 mm ≤ t ≤ 0.6 mm. Furthermore, when 0.3 mm ≤ t ≤ 0.5 mm is set, the strength is such that it can withstand practical use in terms of strength, and the amount of heat conduction is small, so It is preferable because it is less likely to deteriorate due to heat. For the sleeve tube 4, a pipe material may be cut into a predetermined length for use, or a plate material may be punched into an annular shape and press-formed.
【００２０】ホルダー３の中間部の外周と、主体金具１
の固着筒部５との間には、ステンレス（ＳＵＳ４０３）
製の支持筒７が嵌め込まれている。支持筒７は、鋼製、
好ましくはステンレス鋼がよく、更に好ましくは、ビッ
カース硬度２３０Ｈｖ以上とするとよい。支持筒７は、
一端側に、ホルダー３と基筒部５１との間に介装され、
ホルダー３の軸心を主体金具１の軸心に一致させるため
の介装筒部７１を有する。支持筒７の他端側には、ホル
ダー３と中間筒部５３との間に設定された径大部７２が
設けられている。径大部７２は、外周側部は環状当接面
７３となっており、内周側部は上方に延長されて嵌入筒
部７４となっている。The outer periphery of the middle portion of the holder 3 and the metal shell 1
The stainless steel (SUS403) is attached between
A support cylinder 7 made of metal is fitted therein. The support cylinder 7 is made of steel,
Stainless steel is preferable, and Vickers hardness of 230 Hv or higher is more preferable. The support cylinder 7 is
On one end side, interposed between the holder 3 and the base cylinder portion 51,
It has an interposing cylinder portion 71 for aligning the axis of the holder 3 with the axis of the metal shell 1. On the other end side of the support cylinder 7, a large diameter portion 72 set between the holder 3 and the intermediate cylinder portion 53 is provided. The large-diameter portion 72 has an annular contact surface 73 on the outer peripheral side, and an insert cylindrical portion 74 that extends upward on the inner peripheral side.
【００２１】環状当接面７３は袖管４のフランジ部４２
に当接し、袖管４の一端部４１へ嵌入されている。嵌入
筒部７４の長さは少なくとも袖管の厚さとリングパッキ
ンの厚さ（線径）の和であれば、主体金具のかしめ部を
減径かしめによる径方向の圧力に対して有効に反作用力
を維持できて好適である。フランジ部４２とかしめ筒部
５４との間には、ステンレス（ＳＵＳ４３０）製で円形
断面を有するリングパッキン８が介装されている。リン
グパッキン８は、かしめ筒部５４が内側にかしめられた
際にかしめ筒部５４が均一な曲率となるように作用す
る。リングパッキン８の線径は、直径１．０ｍｍ〜２．
０ｍｍであることが望ましい。The annular contact surface 73 is the flange portion 42 of the sleeve tube 4.
And is fitted into the one end portion 41 of the sleeve tube 4. If the length of the fitting tubular portion 74 is at least the sum of the thickness of the sleeve tube and the thickness (wire diameter) of the ring packing, the caulking portion of the metal shell can be effectively reacted with the radial pressure due to the caulking. It is preferable because it can be maintained. A ring packing 8 made of stainless steel (SUS430) and having a circular cross section is interposed between the flange portion 42 and the caulking cylinder portion 54. The ring packing 8 acts so that when the caulking tubular portion 54 is caulked inward, the caulking tubular portion 54 has a uniform curvature. The wire diameter of the ring packing 8 is 1.0 mm to 2.
Desirably, it is 0 mm.
【００２２】リングパッキン８は、鋼板、好ましくはス
テンレス鋼板を打抜き加工して板パッキン９としてもよ
い。この場合は、板厚は１．０ｍｍ〜２．５ｍｍ、リン
グ部の幅は０．５ｍｍ〜１．５ｍｍとすることが望まし
い。また、かしめ筒部５４の変形曲率を均一にするため
にパッキンのコーナー部は半径０．０２〜０．２ｍｍの
面取りを施すことが望ましい。The ring packing 8 may be formed as a plate packing 9 by punching a steel plate, preferably a stainless steel plate. In this case, it is desirable that the plate thickness is 1.0 mm to 2.5 mm and the ring portion width is 0.5 mm to 1.5 mm. Further, in order to make the deformation curvature of the caulking tubular portion 54 uniform, it is desirable that the corner portion of the packing be chamfered with a radius of 0.02 to 0.2 mm.
【００２３】この酸素センサーの組み付けは、つぎのよ
うになされる。プロテクター１５を嵌着した主体金具１
の係合段１０に板パッキン９を配置する。板パッキン９
は、好ましくはステンレス鋼板を打抜き加工して製造す
る。ホルダー３との接合性を良くするためには、ビッカ
ース硬度２０５Ｈｖ〜１５０Ｈｖ、好ましくは１９０Ｈ
ｖ〜１７５Ｈｖにアニールするとよい。The oxygen sensor is assembled as follows. Metal shell 1 with protector 15 fitted
The plate packing 9 is arranged in the engagement step 10 of the above. Board packing 9
Is preferably manufactured by punching a stainless steel plate. In order to improve the bondability with the holder 3, Vickers hardness 205Hv to 150Hv, preferably 190H
It is preferable to anneal to v to 175 Hv.
【００２４】その板パッキン９を配した主体金具１に、
検出素子２を組み込んだホルダー３を差し込み、係合段
１０に鍔部３２の一端面を係合させる。つぎに、主体金
具１の内周とホルダー３の外周との隙間に滑石２５を充
填し、つづいて支持筒７を嵌め込む。つぎに、フランジ
部４２にリングパッキン８を引っ掛けた袖管４の一端部
４１を支持筒７の他端部に突き合わせる。On the metal shell 1 on which the plate packing 9 is arranged,
The holder 3 incorporating the detection element 2 is inserted, and one end surface of the collar portion 32 is engaged with the engagement step 10. Next, a talc 25 is filled in the gap between the inner circumference of the metal shell 1 and the outer circumference of the holder 3, and then the support cylinder 7 is fitted. Next, the one end portion 41 of the sleeve tube 4 in which the ring packing 8 is hooked on the flange portion 42 is butted against the other end portion of the support cylinder 7.
【００２５】つぎに、かしめ筒部５４を含む固着筒部５
を９００度前後に加熱して内側に熱間かしめする。これ
と同時に縮み筒部５２が圧縮する。このかしめ筒部５４
を内側に熱間かしめする工程において、袖管４は一端部
４１が支持筒７に内側から支持されているため、かしめ
筒部５４により不均一な押圧力が加わっても、一端部４
１が歪んだり偏心したりすることを防止できる。Next, the fixed tubular portion 5 including the caulking tubular portion 54.
Is heated to about 900 degrees and hot crimped inside. At the same time, the contracting cylinder portion 52 is compressed. This caulking cylinder 54
In the step of hot caulking the inside of the sleeve tube 4, since the one end portion 41 of the sleeve tube 4 is supported from the inside by the support cylinder 7, even if a nonuniform pressing force is applied by the caulking cylinder portion 54, the one end portion 4
It is possible to prevent 1 from being distorted or eccentric.
【００２６】このため、この発明の酸素センサーは、エ
ンジンの排気管に装着されて高温度に晒されても、熱歪
みの発生が有効に防止でき主体金具１とホルダー３との
一体性が維持できるとともに、シール性の維持が可能と
なる。また、図４に示す従来品では板厚ｔ＝０．８ｍｍ
であった袖管４は、板厚ｔが０．２５ｍｍ≦ｔ≦０．６
ｍｍという薄い材料を使用できる。このため、袖管４を
介しての熱伝導が低減でき、ゴム製のコネクター本体６
４の熱劣化が有効に防止できる。Therefore, the oxygen sensor of the present invention can effectively prevent the occurrence of thermal strain even when it is mounted on the exhaust pipe of the engine and exposed to high temperature, and the integrity of the metal shell 1 and the holder 3 is maintained. In addition to being possible, it is possible to maintain the sealing property. Further, in the conventional product shown in FIG. 4, the plate thickness t = 0.8 mm
The sleeve tube 4 having the thickness t has a plate thickness t of 0.25 mm ≦ t ≦ 0.6.
Materials as thin as mm can be used. Therefore, heat conduction through the sleeve tube 4 can be reduced, and the rubber connector body 6
The thermal deterioration of No. 4 can be effectively prevented.
【００２７】この発明の構造では高温耐久試験であり３
０分間に６５０度に達する繰り返しの１００サイクルの
テストにおいて、図４の従来品は２気圧で毎分５ｃｃの
漏れが発生したが、図１の本発明品の漏れは零であっ
た。なお、この発明のセンサープラグは、酸素センサー
以外に、温度センサーなどのセンサーに使用できる。The structure of the present invention is a high temperature endurance test.
In the test of 100 cycles repeated up to 650 degrees in 0 minutes, the conventional product of FIG. 4 leaked 5 cc / min at 2 atmospheric pressure, whereas the product of the present invention of FIG. 1 leaked zero. In addition to the oxygen sensor, the sensor plug of the present invention can be used for sensors such as temperature sensors.
【００２８】図３は他の実施例を示す。この実施例で
は、組み付け前において袖管４は一端部４１がフランジ
部４２を備えず直管形状となっている。また、支持筒７
は、環状当接面７３に臨んで嵌入筒部７４の外周に形成
した環状凹所７５を有する。環状凹所７５の寸法は、リ
ングパッキン８が遊嵌できる大きさに設定されている。FIG. 3 shows another embodiment. In this embodiment, the sleeve pipe 4 has a straight pipe shape without the flange portion 42 at one end portion 41 before assembly. Also, the support cylinder 7
Has an annular recess 75 formed on the outer periphery of the fitting tubular portion 74 facing the annular contact surface 73. The size of the annular recess 75 is set to a size in which the ring packing 8 can be loosely fitted.
【００２９】この実施例のスパークプラグは、袖管４の
一端部４１を支持筒７の環状当接面７３に突き合わせ
て、かしめ筒部５４を含む固着筒部５を内側にかしめす
る、好ましくは熱間かしめすると、リングパッキン８の
圧縮により一端部４１が内側に押圧されて縮径し、環状
凹所７５に入り込む。これによりかしめ筒部５４はリン
グパッキン８の上面に巻締される。この実施例では、袖
筒４の一端部４１にフランジ部４２を形成することが不
要になるとともに、図１に示す実施例と同様の作用、効
果を奏する。In the spark plug of this embodiment, the one end portion 41 of the sleeve tube 4 is butted against the annular contact surface 73 of the support cylinder 7, and the fixed cylinder portion 5 including the caulking cylinder portion 54 is caulked inward, preferably by heat. When the caulking is performed, the one end portion 41 is pressed inward by the compression of the ring packing 8 and the diameter thereof is reduced, and the one end portion 41 enters the annular recess 75. As a result, the caulking tubular portion 54 is wound around the upper surface of the ring packing 8. In this embodiment, it is not necessary to form the flange portion 42 on the one end portion 41 of the sleeve sleeve 4, and the same operation and effect as those of the embodiment shown in FIG. 1 are achieved.
【図１】この発明のセンサープラグの断面図である。FIG. 1 is a sectional view of a sensor plug of the present invention.
【図２】支持筒の斜視図である。FIG. 2 is a perspective view of a support cylinder.
【図３】この発明の他の実施例のセンサープラグの断面
図である。FIG. 3 is a sectional view of a sensor plug according to another embodiment of the present invention.
【図４】従来のセンサープラグの断面図である。FIG. 4 is a sectional view of a conventional sensor plug.
１ 主体金具 ２ 検出素子 ３ ホルダー ４ 袖管 ５ 固着筒部 ６ コネクター ７ 支持筒 ８ リングパッキン １０ 係合段 ３２ 鍔部 ４２ フランジ部 ５４ かしめ筒部 ７３ 環状当接面 ７４ 嵌入筒部 1 metal shell 2 detection element 3 holder 4 sleeve tube 5 fixed tube section 6 connector 7 support tube 8 ring packing 10 engaging step 32 flange section 42 flange section 54 caulking tube section 73 annular contact surface 74 fitting tube section
Claims (5)
設けられた筒状主体金具内に、検出素子を支持し外周に
前記段部に係合する鍔部が形成された筒状のセラミック
ス製ホルダーを同軸的に嵌め込み、前記ホルダーの外周
と主体金具の内周との間に支持筒を介装させ、一端にフ
ランジ部を設けた袖管の該フランジ部を前記支持筒に突
き合わせて、前記かしめ筒部を内側に減径してかしめる
ことにより、該かしめ筒部と前記係合段との間に前記ホ
ルダーおよび前記フランジ部を一体的に固着したセンサ
ープラグにおいて、 前記支持筒は、前記袖管の一端部に嵌入する嵌入筒部
と、前記フランジ部に当接する環状当接面とを有するこ
とを特徴とするセンサープラグ。1. A brim portion for supporting a detection element and engaging with the step portion is formed on an outer periphery in a tubular metal shell having an engaging step inside and a caulking tubular portion provided at an end thereof. A cylindrical ceramic holder is coaxially fitted, a supporting cylinder is interposed between the outer circumference of the holder and the inner circumference of the metal shell, and the flange portion of the sleeve tube provided with a flange portion at one end is attached to the supporting cylinder. In a sensor plug in which the holder and the flange portion are integrally fixed between the caulking tubular portion and the engaging step by butting and caulking by reducing the diameter of the caulking tubular portion inward, The sensor plug is characterized in that the cylinder has a fitting cylinder part that fits into one end of the sleeve tube, and an annular contact surface that contacts the flange part.
設けられた筒状主体金具内に、検出素子を支持し外周に
前記段部に係合する鍔部が形成された筒状のセラミック
ス製ホルダーを同軸的に嵌め込み、前記ホルダーの外周
と主体金具の内周との間に支持筒を介装させ、袖管の一
端部を前記支持筒に突き合わせて、前記かしめ筒部を内
側に減径してかしめることにより、該かしめ筒部と前記
係合段との間に前記ホルダーおよび前記フランジ部を一
体的に固着したセンサープラグにおいて、 前記支持筒は、前記袖管の一端部に嵌入する嵌入筒部
と、前記一端部を当接する環状当接面と、該環状当接面
に臨んで前記嵌入筒部の外周に形成した環状凹所とを有
することを特徴とするセンサープラグ。2. A flange part which supports a detection element and engages with the step part is formed on the outer periphery in a tubular metal shell having an engaging step inside and a caulking tube part provided at the end. A cylindrical ceramic holder is coaxially fitted, and a supporting cylinder is interposed between the outer circumference of the holder and the inner circumference of the metal shell, and one end of the sleeve tube is abutted against the supporting cylinder, and the caulking cylinder is attached. A sensor plug in which the holder and the flange portion are integrally fixed between the caulking cylinder portion and the engaging step by reducing the diameter to the inside and caulking, wherein the support cylinder is one end portion of the sleeve tube. A sensor plug, characterized in that it has a fitting tubular portion that fits into the housing, an annular contact surface that abuts the one end, and an annular recess formed on the outer periphery of the fitting tubular portion facing the annular contact surface. .
かしめされた前記かしめ筒部との間にはリングパッキン
が介装されており、前記支持筒の嵌入筒部の長さは、少
なくとも前記袖管の厚さとリングパッキンの厚さの和で
あることを特徴とするセンサープラグ。3. The ring packing according to claim 1, wherein a ring packing is interposed between the flange and the crimped cylindrical portion having a reduced diameter, and the length of the fitting cylindrical portion of the support cylinder is at least the above. A sensor plug characterized by the sum of the sleeve tube thickness and the ring packing thickness.
径かしめされた前記かしめ筒部との間には、前記袖管の
一端部の外周を囲むリングパッキンが介装されているこ
とを特徴とするセンサープラグ。4. The ring packing according to claim 2, wherein a ring packing that surrounds an outer periphery of one end of the sleeve tube is interposed between the annular contact surface and the crimped caulked tubular portion. Characteristic sensor plug.
袖管は、板厚が０．２５ｍｍ〜０．６ｍｍのステンレス
製であることを特徴とするセンサープラグ。5. The sensor plug according to claim 1, wherein the sleeve tube is made of stainless steel having a plate thickness of 0.25 mm to 0.6 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06980996A JP3568315B2 (en) | 1996-03-26 | 1996-03-26 | Sensor plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06980996A JP3568315B2 (en) | 1996-03-26 | 1996-03-26 | Sensor plug |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09257743A true JPH09257743A (en) | 1997-10-03 |
| JP3568315B2 JP3568315B2 (en) | 2004-09-22 |
Family
ID=13413466
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP06980996A Expired - Fee Related JP3568315B2 (en) | 1996-03-26 | 1996-03-26 | Sensor plug |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3568315B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002082085A (en) * | 2000-06-30 | 2002-03-22 | Denso Corp | Gas sensor |
| JP2007163307A (en) * | 2005-12-14 | 2007-06-28 | Denso Corp | Gas sensor |
| JP2014081296A (en) * | 2012-10-17 | 2014-05-08 | Ngk Spark Plug Co Ltd | Gas sensor |
-
1996
- 1996-03-26 JP JP06980996A patent/JP3568315B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002082085A (en) * | 2000-06-30 | 2002-03-22 | Denso Corp | Gas sensor |
| JP4491975B2 (en) * | 2000-06-30 | 2010-06-30 | 株式会社デンソー | Gas sensor |
| JP2007163307A (en) * | 2005-12-14 | 2007-06-28 | Denso Corp | Gas sensor |
| JP2014081296A (en) * | 2012-10-17 | 2014-05-08 | Ngk Spark Plug Co Ltd | Gas sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3568315B2 (en) | 2004-09-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6411038B2 (en) | Installation structure of engine component with combustion pressure sensor in engine | |
| JP4152438B2 (en) | Measurement detector | |
| EP1096141B1 (en) | Glow Plug having a combustion pressure sensor | |
| JP3885515B2 (en) | Glow plug with combustion pressure sensor | |
| US5949023A (en) | Temperature-resistant cable bushing and method for the manufacture of the same | |
| JP2006514311A (en) | Measuring sensor | |
| JPH11513113A (en) | Sensor with glass seal | |
| JP2010139148A (en) | Glow plug with combustion pressure sensor and internal combustion engine | |
| JP4693108B2 (en) | Sensor | |
| JP2018119901A (en) | Gas sensor | |
| JP5295743B2 (en) | Glow plug with combustion pressure sensor | |
| CN112105925B (en) | Gas sensor | |
| JP2013015511A (en) | Gas sensor | |
| US7584648B2 (en) | Gas sensor containing a protective tube | |
| JP3029802B2 (en) | Gas sensor | |
| US20070167079A1 (en) | Gas sensor production method and gas sensor | |
| JPH029705B2 (en) | ||
| JPH09257743A (en) | Sensor plug | |
| JP7044668B2 (en) | Gas sensor | |
| JP6542707B2 (en) | Gas sensor | |
| JP5099786B2 (en) | Gas sensor | |
| JP2022018199A (en) | Sensor | |
| JP2004226117A (en) | Manufacturing method of gas sensor, and gas sensor | |
| WO2004106910A1 (en) | Gas sensor and method of producing the same | |
| JP2005010143A (en) | Measuring sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20040120 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20040308 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20040602 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20040615 |
|
| R150 | Certificate of patent (=grant) or registration of utility model |
Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080625 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090625 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090625 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090625 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100625 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100625 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110625 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110625 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120625 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120625 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130625 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (prs date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130625 Year of fee payment: 9 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| LAPS | Cancellation because of no payment of annual fees |