JPH0339706Y2 - - Google Patents
Info
- Publication number
- JPH0339706Y2 JPH0339706Y2 JP9743885U JP9743885U JPH0339706Y2 JP H0339706 Y2 JPH0339706 Y2 JP H0339706Y2 JP 9743885 U JP9743885 U JP 9743885U JP 9743885 U JP9743885 U JP 9743885U JP H0339706 Y2 JPH0339706 Y2 JP H0339706Y2
- Authority
- JP
- Japan
- Prior art keywords
- metal case
- outer diameter
- gasket
- annular
- rubber
- 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 28
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 3
- 229910052731 fluorine Inorganic materials 0.000 claims description 3
- 239000011737 fluorine Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims 1
- 238000012856 packing Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000007779 soft material Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical group [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-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じ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、前記振動によつて生じる圧力変動を圧電
素子によつて検知するガスケツト型圧力センサー
に関するものである。[Detailed description of the invention] (Field of industrial application) This 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 a gasket type pressure sensor that uses a piezoelectric element to detect pressure fluctuations caused by the vibrations.
（従来の技術）
この種圧力センサーとしては従来例は第２図に
示すように環状に形成された圧電素子３，３を内
部電極板２を介して積み重ね、その上下に外部電
極となる環状の押え金４ａ，４ｂを配して積層体
５を構成し、この積層体を金属ケース７によりほ
ぼ包被してなり、この金属ケースは通常金属の絞
り加工で施されるが、この場合にできる金属ケー
スの環状端縁の衝合部８からの水分等の浸入を防
ぐために、この衝合部に面して配される押え金４
ｂを凸形状とし、金属ケース７の内側と押え金４
ｂの凸形状の欠除部の面との間の間隙にゴムパツ
キン９を装着させることによつて金属ケース内面
と積層体の間が封止され、内部電極板２に接続し
た出力取り出し用リード線１１を金属ケースの一
端に設けた導出孔１２から導出されてなる構造の
ものが知られている。なお、押え板６は軟質材料
からなるもので、前記の金属ケースの絞り加工に
おける金属の延展によりその厚にバラ付を生ずる
傾向にあり、これを調整するために金属ケースの
薄くなつた端縁部の内側に挿入されているもので
ある。(Prior art) As shown in FIG. 2, a conventional pressure sensor of this type has annularly formed piezoelectric elements 3, 3 stacked together with an internal electrode plate 2 interposed therebetween, and above and below the annularly formed external electrodes. The presser feet 4a and 4b are arranged to form a laminate 5, and this laminate is almost covered by a metal case 7, which is usually done by metal drawing, but can be done in this case. In order to prevent moisture from entering from the abutment part 8 of the annular edge of the metal case, a presser foot 4 is placed facing the abutment part 8 of the annular edge of the metal case.
b has a convex shape, and the inside of the metal case 7 and the presser foot 4
By attaching a rubber gasket 9 to the gap between the surface of the convex cutout part b, the space between the inner surface of the metal case and the laminate is sealed, and the output lead wire connected to the internal electrode plate 2 is sealed. 11 is known to be led out from a lead-out hole 12 provided at one end of a metal case. Note that the holding plate 6 is made of a soft material, and its thickness tends to vary due to the spreading of the metal during the drawing process of the metal case. It is inserted inside the section.
（考案が解決しようとする問題点）
ところで、この種圧力センサーはエンジンのシ
リンダーヘツド座面とスパークプラグの座面との
間に介装されて、エンジンの振動により圧電素子
３，３に圧縮歪を生じさせ、該振動に同期する出
力信号を圧電素子から取り出すものであり、金属
ケースと凸形状押え金の間に介装されているゴム
パツキンの外径が不適当であると種々不具合を生
じる。即ち、ゴムパツキンの外径が大きすぎると
エンジンの振動が押え金に均一に伝達されず圧電
素子に対して上記振動に応じた圧縮歪を生じさせ
ることができず、従つて出力が不安定となつて振
動による圧力変動を正しく検知できなくなる。一
方ゴムパツキンの外径が小さすぎるとパツキンの
作用をせず、また金属ケースを成形する際に押え
金に直接力が働き圧電素子が割れることがある。
しかし、今日までこのゴムパツキンの最適の外径
を求める基準が明確でないために上記の種々の問
題を生じておりその解決が待望されていた。(Problem to be solved by the invention) By the way, this type of pressure sensor is interposed between the cylinder head seating surface of the engine and the spark plug seating surface, and compressive strain is applied to the piezoelectric elements 3, 3 due to engine vibration. An output signal synchronized with the vibration is extracted from the piezoelectric element, and if the outer diameter of the rubber gasket interposed between the metal case and the convex presser foot is inappropriate, various problems will occur. In other words, if the outer diameter of the rubber seal is too large, engine vibrations will not be uniformly transmitted to the presser foot, making it impossible to generate compressive strain in the piezoelectric element in response to the vibrations, and the output will therefore become unstable. pressure fluctuations due to vibration cannot be detected correctly. On the other hand, if the outer diameter of the rubber seal is too small, the seal will not work, and when molding a metal case, direct force will be applied to the presser foot, which may cause the piezoelectric element to crack.
However, until now, the criteria for determining the optimum outer diameter of this rubber packing have not been clear, resulting in the various problems mentioned above, and a solution to these problems has been awaited.
（問題点を解決するための手段、作用）
本考案は上記せる如き問題点を解決するために
最適な外径を有するゴムパツキンを選択できるよ
うにしたものである。即ち、金属ケース内面の環
状外径及び内径をそれぞれＡ及びＢ、凸形状押え
金の突出部の環状外径及び内径をそれぞれＣ及び
Ｄ、圧電素子の環状外径及び内径をそれぞれＥ及
びＦ、ゴムパツキンの横断面外径をＷとしたと
き、Ｄ＝Ｆ±１、Ｃ＝Ｅ±１を満足し、かつ
１／２〔１／２（Ａ−Ｂ）−１／２（Ｃ−Ｄ）〕＋２≧
Ｗ＞
１／２〔１／２（Ａ−Ｂ）−１／２（Ｃ−Ｄ）〕（単位
はmm、
以下同様）
を満足するＷを外径とするゴムパツキンを使用す
る。これによつて圧電素子に加わる圧力が全面に
均一化され安定した出力を得られる圧力センサー
とするものである。(Means and operations for solving the problems) The present invention is designed to solve the above-mentioned problems by making it possible to select a rubber packing having an optimal outer diameter. That is, the annular outer diameter and inner diameter of the inner surface of the metal case are A and B, respectively, the annular outer diameter and inner diameter of the protrusion of the convex presser foot are C and D, respectively, and the annular outer diameter and inner diameter of the piezoelectric element are E and F, respectively. When the cross-sectional outer diameter of the rubber packing is W, D = F ± 1, C = E ± 1, and 1/2 [1/2 (A-B) - 1/2 (C-D)] +2≧
Use a rubber gasket whose outer diameter is W that satisfies W > 1/2 [1/2 (A-B) - 1/2 (C-D)] (units are mm, the same applies hereinafter). As a result, the pressure applied to the piezoelectric element is made uniform over the entire surface, resulting in a pressure sensor that can obtain a stable output.
なお、凸形状の押え金の突出部の環状外径Ｃ及
び内径Ｄを圧電素子の環状外径Ｅ及び内径Ｆの近
傍（±１mm）に設定することによつて、前記押え
金の偏圧を防止することができる。また、Ｄ及び
Ｃ共に±１mm以上になると偏圧が大きくなり出力
のバラツキが大きくなる。 In addition, by setting the annular outer diameter C and inner diameter D of the protruding part of the convex presser foot in the vicinity (±1 mm) of the annular outer diameter E and inner diameter F of the piezoelectric element, the unbalanced pressure of the presser foot can be reduced. It can be prevented. Furthermore, if both D and C exceed ±1 mm, the partial pressure will increase and the variation in output will increase.
また、Ｏリングの外径Ｗを
Ｗ＞１／２〔１／２（Ａ−Ｂ）−１／２（Ｃ−Ｄ）
〕
とする理由は前記式よりも小さいとＯリングのシ
ール効果が損なわれるだけでなく、押え金に直接
力が作用して圧電素子が割れるおそれがある。 Also, the outer diameter W of the O-ring is W > 1/2 [1/2 (A-B) - 1/2 (C-D)
] The reason for this is that if it is smaller than the above formula, not only will the sealing effect of the O-ring be impaired, but there is also a risk that force will directly act on the presser foot and cause the piezoelectric element to crack.
一方、
１／２〔１／２（Ａ−Ｂ）−１／２（Ｃ−Ｄ）〕＋
２≧Ｗ
とする理由は前記式が限度で、これよりＯリング
が大きくなるとＯリングが振動を吸収して押え金
に均一に伝達せず圧電素子の出力が不安定となつ
て圧力変動を正しく検知できなくなる。 On the other hand, 1/2 [1/2 (A-B) - 1/2 (C-D)] +
The reason for setting 2≧W is that the above formula is the limit; if the O-ring becomes larger than this, the O-ring absorbs vibrations and does not transmit them uniformly to the presser foot, making the output of the piezoelectric element unstable and making it difficult to properly control pressure fluctuations. becomes undetectable.
（実施例）
第１図イは本考案によるガスケツト型圧力セン
サーの一実施例の要部を示す縦断面図で、環状の
圧電素子３，３を環状の内部電極板２を介して積
み重ね、さらにその上下に外部電極として環状の
押え金４ａ，４ｂを積み重ねて積層体５が構成さ
れ、この積層体５が金属ケース７内に収納され、
金属ケース７の内面と内部電極板２及び圧電素子
３，３の側面との間に耐熱性絶縁材１０が充填さ
れ、金属ケース７の端縁の衝合部８に面して配さ
れた押え金４ｂの凸形状の欠除部の面と金属ケー
ス７との間の間隙にゴムパツキン９が装着され、
第２図の従来例と同じく金属ケース厚が薄くなつ
た金属ケース端縁部の内面と押え金４ｂの凸部と
の間に軟質材料からなる押え板６が介装されてな
る構造を有するもので、上記ゴムパツキンの横断
面外径Ｗが前記の１／２〔１／２（Ａ−Ｂ）−１／２（
Ｃ−
Ｄ）〕＋２≧Ｗ＞１／２〔１／２（Ａ−Ｂ）−１／２（
Ｃ−
Ｄ）〕
を満足するよう選定されたふつ素ゴムＯリングが
用いられた。なお、前記の凸形状押え金４ｂは第
１図ロに示す如く広幅環状板４b-1と細幅環状板
４b-2とに分離して制作しこれらを積み重ねて凸
形状に構成される押え金を用いる場合にももちろ
ん適用できるものである。(Example) FIG. 1A is a vertical cross-sectional view showing the main part of an embodiment of the gasket type pressure sensor according to the present invention, in which annular piezoelectric elements 3, 3 are stacked with an annular internal electrode plate 2 interposed therebetween, and A laminate 5 is constructed by stacking ring-shaped presser feet 4a and 4b as external electrodes above and below, and this laminate 5 is housed in a metal case 7,
A heat-resistant insulating material 10 is filled between the inner surface of the metal case 7 and the side surfaces of the internal electrode plate 2 and the piezoelectric elements 3, 3, and a presser foot is disposed facing the abutting portion 8 of the edge of the metal case 7. A rubber gasket 9 is attached to the gap between the surface of the convex cutout of the metal 4b and the metal case 7,
Similar to the conventional example shown in FIG. 2, the metal case has a structure in which a presser plate 6 made of a soft material is interposed between the inner surface of the edge of the metal case whose thickness is reduced and the convex portion of the presser foot 4b. Then, the outer diameter W of the cross section of the rubber gasket is 1/2 [1/2 (A-B) - 1/2 (
C-D)]+2≧W>1/2[1/2(A-B)-1/2(
A fluorine rubber O-ring selected to satisfy C-D) was used. The convex presser foot 4b is manufactured separately into a wide annular plate 4b -1 and a narrow annular plate 4b -2 as shown in FIG. Of course, this can also be applied when using .
（考案の効果）
本考案によるガスケツト型圧力センサーは、前
記の如くＯリング状のゴムパツキンの横断面外径
が最適に選択されているので、ゴムパツキンの外
径過大に起因する出力不安定が解消され、また外
径過小に起因する圧電素子の割れも防ぐことがで
き、しかも金属ケースの端縁の衝合部からの水等
の浸入に対するゴムパツキンの封止効果は十分で
ある。なお、ゴムパツキンにふつ素系ゴムを用い
ることによつて十分に耐熱性のものであり安定し
た構造のガスケツト型圧力センサーを提供でき
る。(Effects of the invention) In the gasket type pressure sensor according to the invention, as mentioned above, the cross-sectional outside diameter of the O-ring-shaped rubber packing is optimally selected, so the output instability caused by an excessively large outside diameter of the rubber packing is eliminated. Moreover, cracking of the piezoelectric element due to an excessively small outer diameter can be prevented, and the sealing effect of the rubber gasket against infiltration of water etc. from the abutting portion of the edge of the metal case is sufficient. By using fluorine-based rubber for the rubber gasket, a gasket type pressure sensor can be provided which is sufficiently heat resistant and has a stable structure.
第１図イは本考案によるガスケツト型圧力セン
サーの一実施例の要部を示す縦断面図、第１図ロ
は凸形状押え金が分離型の場合の縦断面図、第２
図は従来例のガスケツト型圧力センサーの縦断面
図である。
１……圧力センサー本体、２……内部電極板、
３……圧電素子、４ａ……平板状押え金、４ｂ…
…凸形状押え金、７……金属ケース、９……ゴム
パツキン、Ａ……金属ケース内面の環状外径、Ｂ
……金属ケース内面の環状内径、Ｃ……凸形状押
え金突出部の環状外径、Ｄ……凸形状押え金突出
部の環状内径、Ｗ……ゴムパツキン横断面外径。
FIG. 1A is a vertical cross-sectional view showing the essential parts of an embodiment of the gasket type pressure sensor according to the present invention, FIG.
The figure is a longitudinal sectional view of a conventional gasket type pressure sensor. 1...Pressure sensor body, 2...Internal electrode plate,
3... Piezoelectric element, 4a... Flat presser foot, 4b...
...Convex presser foot, 7...Metal case, 9...Rubber gasket, A...Annular outer diameter of inner surface of metal case, B
...Annular inner diameter of the inner surface of the metal case, C...Annular outer diameter of the convex presser foot protrusion, D...Annular inner diameter of the convex presser foot protrusion, W...Outer diameter of the cross section of the rubber seal.
Claims (1)
と、更にその上下に外部電極となる押え金とが
順次積層されてなる積層体が、その周囲をほぼ
包被するように形成された環状の金属ケース内
に収納され、かつ金属ケースの端縁の衝合部に
面して配された押え金が凸形状をなし、この押
え金の凸形状の欠除部の面と金属ケースとの間
の間隙にＯリング状ゴムパツキンが装填されて
なるガスケツト型圧力センサーにおいて、金属
ケース内面の環状外径及び内径をそれぞれＡ及
びＢ、圧電素子の環状外径及び内径をそれぞれ
Ｅ及びＦ、凸形状押え金の突出部の環状外径及
び内径をそれぞれＣ及びＤ、ゴムパツキンの横
断面外径をＷとしたときＤ＝Ｆ±１、Ｃ＝Ｅ±
１を満足し、かつＷが １／２〔１／２（Ａ−Ｂ）−１／２（Ｃ−Ｄ）〕＋２≧
Ｗ １／２〔１／２（Ａ−Ｂ）−１／２（Ｃ−Ｄ）〕（単位
は mm）を満足するゴムパツキンを用いたことを特
徴とするガスケツト型圧力センサー。 (2) ゴムパツキンの材料がふつ素系ゴムである実
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) A laminate consisting of an annular internal electrode plate, piezoelectric elements above and below the plate, and presser feet serving as external electrodes above and below the plate; A presser foot that is housed in an annular metal case that is formed to cover the metal case and that is placed facing the abutting portion of the edge of the metal case has a convex shape. In a gasket-type pressure sensor in which an O-ring-shaped rubber gasket is loaded in the gap between the surface of the removed part and the metal case, the annular outer diameter and inner diameter of the inner surface of the metal case are A and B, respectively, and the annular outer diameter and the piezoelectric element are When the inner diameter is E and F, the annular outer diameter and inner diameter of the protruding part of the convex presser foot are C and D, respectively, and the cross-sectional outer diameter of the rubber seal is W, D=F±1, C=E±
1 and W is 1/2 [1/2 (A-B) - 1/2 (C-D)] + 2≧
A gasket type pressure sensor characterized by using a rubber gasket satisfying W 1/2 [1/2 (A-B) - 1/2 (C-D)] (unit: mm). (2) The gasket type pressure sensor according to claim 1, wherein the material of the rubber seal is fluorine rubber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9743885U JPH0339706Y2 (en) | 1985-06-28 | 1985-06-28 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9743885U JPH0339706Y2 (en) | 1985-06-28 | 1985-06-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS627046U JPS627046U (en) | 1987-01-16 |
| JPH0339706Y2 true JPH0339706Y2 (en) | 1991-08-21 |
Family
ID=30964356
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9743885U Expired JPH0339706Y2 (en) | 1985-06-28 | 1985-06-28 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0339706Y2 (en) |
-
1985
- 1985-06-28 JP JP9743885U patent/JPH0339706Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS627046U (en) | 1987-01-16 |
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