JPH0318902Y2 - - Google Patents
Info
- Publication number
- JPH0318902Y2 JPH0318902Y2 JP13692485U JP13692485U JPH0318902Y2 JP H0318902 Y2 JPH0318902 Y2 JP H0318902Y2 JP 13692485 U JP13692485 U JP 13692485U JP 13692485 U JP13692485 U JP 13692485U JP H0318902 Y2 JPH0318902 Y2 JP H0318902Y2
- Authority
- JP
- Japan
- Prior art keywords
- metal case
- gasket
- pressure sensor
- presser foot
- edges
- 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
- 239000002184 metal Substances 0.000 claims description 20
- 229920001971 elastomer Polymers 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 4
- 238000012856 packing Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 description 11
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 4
- 229910052731 fluorine Inorganic materials 0.000 description 4
- 239000011737 fluorine Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000009835 boiling Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229920005560 fluorosilicone rubber Polymers 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Measuring Fluid Pressure (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
本考案は内燃機関の燃焼圧力、ノツキング及び
燃料噴射により振動を生ずるエンジンのシリンダ
ーヘツド座面とスパークプラグの座面との間に介
装され、前記振動により生ずる圧力変動を圧電素
子によつて検知するガスケツト型圧力センサーの
構造の改良に関するものである。[Detailed description of the invention] [Industrial application field] The present invention is a spark plug installed between the engine cylinder head seating surface and the spark plug seating surface, which generate vibrations due to combustion pressure, knocking, and fuel injection in an internal combustion engine. This invention relates to an improvement in the structure of a gasket type pressure sensor that uses a piezoelectric element to detect pressure fluctuations caused by the vibrations.
第２図イは、この種圧力センサー１の従来例を
示した縦断面図で、同図ロは、その要部を拡大し
て示したものであり、これらの図にみられるよう
に環状に形成された内部電極板２と、その上下に
配された圧電素子３Ａ，３Ｂ及びこれら圧電素止
それぞれの外側電極となる環状の上部押え金４及
び下部押え金５とが積み重ねられてなる環状の積
層体６がその周囲を包被するように形成された環
状の金属ケース７内に収納され、該金属ケース７
の端縁７Ａ，７Ｂでかしめ固定されると共に、か
しめ部から水分、油等が浸入し圧電素子に悪影響
を与えることを防止する為、上部押え金４の上面
における外側及び内側周縁に形成された環状の切
欠部４Ａ，４Ｂと金属ケース７のかしめられた端
縁７Ａ，７Ｂの内面間をＯリング８Ａ，８Ｂで封
止してなり、内部電極板２に接続された出力取り
出し用リード線９が金属ケース７の一端に設けた
導出孔７ｃから導出される構造をもつものが知ら
れている。
Fig. 2A is a vertical sectional view showing a conventional example of this type of pressure sensor 1, and Fig. 2B is an enlarged view of the main part. An annular structure is formed by stacking the formed internal electrode plate 2, piezoelectric elements 3A and 3B disposed above and below the plate, and an annular upper presser foot 4 and a lower presser foot 5 which serve as the outer electrodes of each of these piezoelectric stops. The laminate 6 is housed in an annular metal case 7 formed to cover the periphery thereof, and the metal case 7
The upper presser foot 4 is fixed by caulking at the edges 7A and 7B, and is formed on the outer and inner peripheral edges of the upper surface of the upper presser foot 4 in order to prevent moisture, oil, etc. from entering through the caulking portion and adversely affecting the piezoelectric element. The annular notches 4A, 4B and the inner surfaces of the caulked edges 7A, 7B of the metal case 7 are sealed with O-rings 8A, 8B, and the output lead wire 9 is connected to the internal electrode plate 2. There is a known structure in which the metal case 7 is led out from a lead-out hole 7c provided at one end of the metal case 7.
ところで、上記せる如き従来の圧力センサーに
おいては、積層体６の上部押え金４の環状切欠部
４Ａ，４Ｂと、金属ケースの端縁７Ａ，７Ｂの内
面間に配するシール用パツキン部材としてRTV
シリコンゴムのＯリング８Ａ，８Ｂを用いてお
り、このＯリングは形状、寸法が小さく機械的強
度が弱いため、金属ケースの端縁７Ａ，７Ｂによ
るかしめ組付時にねじれ、破断等を生じ易く、又
耐油性に劣るため確実なシール性が得られ難いこ
とにより信頼性が不十分となる問題点があつた。
By the way, in the conventional pressure sensor as described above, RTV is used as a sealing packing member disposed between the annular notches 4A, 4B of the upper presser foot 4 of the laminate 6 and the inner surfaces of the edges 7A, 7B of the metal case.
Silicone rubber O-rings 8A and 8B are used, and since these O-rings are small in shape and size and have low mechanical strength, they are likely to twist or break when caulked and assembled using the edges 7A and 7B of the metal case. Furthermore, due to poor oil resistance, it is difficult to obtain reliable sealing performance, resulting in insufficient reliability.
本考案は、かゝる状況に鑑みなされたものであ
つて、シール用パツキン部材として上記せる如き
従来のＯリング８Ａ，８Ｂに代え、上部押え金４
の切欠部４Ａ，４Ｂに適当な弾性とすぐれた耐熱
性、耐油性を有するふつ素系のゴム部材を予め焼
付け成形して固着させておき、外側から金属ケー
スの端縁７Ａ，７Ｂでかしめるようにしたもので
ある。
The present invention was developed in view of the above situation, and instead of the conventional O-rings 8A and 8B mentioned above as sealing packing members, an upper presser foot 4 is used.
A fluorine-based rubber member having appropriate elasticity and excellent heat resistance and oil resistance is baked and fixed in advance to the notches 4A and 4B of the metal case, and caulked from the outside with the edges 7A and 7B of the metal case. This is how it was done.
かゝるシール構造とすることにより、積層体６
の金属ケース端縁４Ａ，４Ｂによるかしめ組付時
における作業が容易化され、押え金の切欠部４
Ａ，４Ｂと金属ケースの端縁７Ａ，７Ｂ内面間に
介在するゴム部材の弾性によりすぐれたシール性
が得られるものである。
With such a sealing structure, the laminate 6
The metal case edges 4A, 4B make it easier to assemble the caulking work, and the notch 4 of the presser foot
Excellent sealing properties can be obtained due to the elasticity of the rubber member interposed between A and 4B and the inner surfaces of the edges 7A and 7B of the metal case.
第１図は、本考案圧力センサーの実施例の要部
を示す縦断面図（第２図と同一部分は同一符号で
示す）で、同図イは上部の外側及び内側の端縁に
設けた切欠部４Ａ，４Ｂにふつ素系のゴム部材８
Ｃ，８Ｄを焼付け成形してなる上部押え金４′を
示したものであり、又同図ロは、ゴム部材８Ｃ，
８Ｄを押え金の切欠部４′Ａ，４′Ｂの外側にはみ
出すように幾分大きめの寸法に成形し焼付けられ
てなるもので、金属ケースの端縁７Ａ，７Ｂによ
るかしめ時にゴム部材８Ｃ，８Ｄの変形量が大き
くなることによつて、シール性が高められるもの
である。
Fig. 1 is a vertical cross-sectional view showing the main parts of the embodiment of the pressure sensor of the present invention (the same parts as in Fig. 2 are indicated by the same reference numerals). Fluorine-based rubber members 8 are provided in the notches 4A and 4B.
This figure shows the upper presser foot 4' made by baking and molding the rubber members 8C and 8D.
8D is molded into a somewhat larger size so as to protrude outside the notches 4'A and 4'B of the presser foot, and is baked, so that when the end edges 7A and 7B of the metal case are caulked, the rubber members 8C and The sealing performance is improved by increasing the amount of deformation of 8D.
なお、押え金の切欠部４′Ａ，４′Ｂに焼付け成
形されるふつ素系のゴム部材８Ｃ，８Ｄとして
は、ゴム硬度30〜120（JIS Ａ）で、かつ内蔵する
圧電素子のキユリー点以下で100℃以上の耐熱性
を有すると共に耐油性の良い例えば四ふつ化エチ
レンゴムもしくはフロロシリコンゴム等を用る。 The fluorine-based rubber members 8C and 8D that are baked and molded into the notches 4'A and 4'B of the presser foot must have a rubber hardness of 30 to 120 (JIS A), and must meet the Kurie point of the built-in piezoelectric element. In the following, a material having heat resistance of 100° C. or higher and good oil resistance, such as tetrafluoroethylene rubber or fluorosilicone rubber, is used.
同図ハは本考案圧力センサー１′の積層体６′が
金属ケース７内に収納された状態を示したもので
あり、切欠部４Ａ，４Ｂにシール用ゴム部材８
Ｃ，８Ｄを予め焼付成形してなる上部押え金４′
を組合せた積層体６′を、図に点線及び矢印で示
すように金属ケースの端縁７Ａ，７Ｂで外側から
かしめることによりゴム部材８Ｃ，８Ｄを圧縮変
形させ、その弾性により封止されてなるものであ
る。 Figure C shows a state in which the laminated body 6' of the pressure sensor 1' of the present invention is housed in the metal case 7, and sealing rubber members 8 are provided in the notches 4A and 4B.
Upper presser foot 4' made by baking and forming C, 8D in advance
The rubber members 8C and 8D are compressed and deformed by caulking the laminated body 6' with the edges 7A and 7B of the metal case from the outside as shown by dotted lines and arrows in the figure, and the rubber members 8C and 8D are sealed by their elasticity. It is what it is.
以上説明せるように本考案圧力センサーは金属
ケース内の積層体が該積層体の上記押え金の上部
両端縁に設けた環状切欠部にすぐれた弾性、耐熱
性、耐油性を有するふつ素系ゴム材を予め焼付け
成形させてシール用パツキンとし、外側から金属
ケースの端縁でかしめ封止されてなる構造をもつ
ため、組付時にＯリングをシール用パツキン部材
としていた従来の如きＯリング切れ、ねじれ等を
生じることがないため、組付作業が極めて容易化
され安定したシール性が得られると共に、信頼性
が向上され従来の問題点を解決したガスケツト型
圧力センサーとして提供できるものである。
As explained above, in the pressure sensor of the present invention, the laminate in the metal case is made of fluorine-based rubber having excellent elasticity, heat resistance, and oil resistance in the annular notches provided at both ends of the upper part of the presser foot of the laminate. Because it has a structure in which the material is baked and formed in advance to form a sealing gasket, and it is caulked and sealed from the outside with the edge of the metal case, there is no need to worry about the O-ring breaking during assembly, unlike conventional O-rings that were used as a sealing gasket. Since no twisting or the like occurs, the assembly work is extremely facilitated, stable sealing performance is obtained, reliability is improved, and the gasket type pressure sensor can be provided as a solution to conventional problems.
なお、Ｏリングをシール用パツキン部材として
用いた従来のものと、本考案によるシール構造に
よる圧力センサーについて行なつた浸水温度サイ
クル試験（沸騰水で煮沸−水冷繰返し）の結果、
圧電素子の絶縁不良率が本考案によるものは従来
のものに比し約１／10程度に減少することが立証
された。 In addition, the results of a water immersion temperature cycle test (boiling with boiling water - repeated water cooling) conducted on a conventional pressure sensor using an O-ring as a sealing member and a pressure sensor with a seal structure according to the present invention.
It has been proven that the insulation failure rate of piezoelectric elements according to the present invention is reduced to about 1/10 compared to the conventional one.
第１図は本考案圧力センサーの実施例の要部を
示す縦断面図、第２図は従来例圧力センサーの縦
断面図で、同図ロは同図イの要部の拡大図であ
る。
１……圧力センサー、２……内部電極板、３
Ａ，３Ｂ……圧電素子、４……上部押え金、４
Ａ，４Ｂ……切欠部、６……積層体、７……金属
ケース、８Ａ，８Ｂ……Ｏリング、８Ｃ，８Ｄ…
…ゴム部材、９……リード線。
FIG. 1 is a vertical cross-sectional view showing the main parts of an embodiment of the pressure sensor of the present invention, FIG. 2 is a vertical cross-sectional view of a conventional pressure sensor, and FIG. 2B is an enlarged view of the main parts of FIG. 1...Pressure sensor, 2...Internal electrode plate, 3
A, 3B... Piezoelectric element, 4... Upper presser foot, 4
A, 4B... Notch, 6... Laminated body, 7... Metal case, 8A, 8B... O-ring, 8C, 8D...
...Rubber member, 9...Lead wire.
Claims (1)
圧電素子３Ａ，３Ｂと、外側電極となる上部押
え金４及び下部押え金５とが積み重ねられてな
る環状の積層体６が、その周囲を包被するよう
に形成された環状の金属ケース７内に収納され
端縁７Ａ，７Ｂでかしめ固定されると共に、上
記上部押え金４の上における外側及び内側周縁
に形成した環状の切欠部４Ａ，４Ｂと金属ケー
ス７の内面間をパツキンにより封止してなる構
造を有するガスケツト型圧力センサーにおい
て、前記積層体６が、上部押え金４の上部両端
縁に設けられた環状切欠部４Ａ，４Ｂに予め焼
付けされてなるゴム部材により、金属ケース７
の端縁７Ａ，７Ｂの内面間で封止され、該ケー
ス７内に収納されてなることを特徴とするガス
ケツト型圧力センサー。 (2) 上記ゴムパツキン材に、硬度が30〜120（JIS
Ａ）、で、内蔵する圧電素子のキユリー点以下
で100℃の耐熱性を有する耐油性ゴム材料を用
いた実用新案登録請求の範囲第１項記載のガス
ケツト型圧力センサー。[Claims for Utility Model Registration] (1) An annular internal electrode plate 2, piezoelectric elements 3A and 3B disposed above and below it, and an upper presser foot 4 and a lower presser foot 5 that serve as outer electrodes are stacked. An annular laminate 6 is housed in an annular metal case 7 formed to cover its periphery, and is caulked and fixed at edges 7A and 7B. In a gasket type pressure sensor having a structure in which the annular notches 4A, 4B formed on the inner periphery and the inner surface of the metal case 7 are sealed with a gasket, the laminated body 6 is attached to both upper end edges of the upper presser foot 4. The metal case 7
A gasket-type pressure sensor characterized in that it is sealed between the inner surfaces of the edges 7A and 7B of the gasket, and is housed in the case 7. (2) The above rubber packing material has a hardness of 30 to 120 (JIS
A), the gasket type pressure sensor according to claim 1, which is made of an oil-resistant rubber material having heat resistance of 100° C. below the Curie point of the built-in piezoelectric element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13692485U JPH0318902Y2 (en) | 1985-09-09 | 1985-09-09 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13692485U JPH0318902Y2 (en) | 1985-09-09 | 1985-09-09 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6246347U JPS6246347U (en) | 1987-03-20 |
| JPH0318902Y2 true JPH0318902Y2 (en) | 1991-04-22 |
Family
ID=31040494
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13692485U Expired JPH0318902Y2 (en) | 1985-09-09 | 1985-09-09 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0318902Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0631395Y2 (en) * | 1987-05-22 | 1994-08-22 | 日産自動車株式会社 | Washer pressure sensor |
-
1985
- 1985-09-09 JP JP13692485U patent/JPH0318902Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6246347U (en) | 1987-03-20 |
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