JPH0318901Y2 - - Google Patents
Info
- Publication number
- JPH0318901Y2 JPH0318901Y2 JP19005284U JP19005284U JPH0318901Y2 JP H0318901 Y2 JPH0318901 Y2 JP H0318901Y2 JP 19005284 U JP19005284 U JP 19005284U JP 19005284 U JP19005284 U JP 19005284U JP H0318901 Y2 JPH0318901 Y2 JP H0318901Y2
- Authority
- JP
- Japan
- Prior art keywords
- metal case
- laminate
- pressure sensor
- internal electrode
- housed
- 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 27
- 239000011810 insulating material Substances 0.000 claims description 5
- 238000002485 combustion reaction Methods 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 description 5
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical group [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 3
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920002379 silicone rubber Polymers 0.000 description 2
- 239000004945 silicone rubber Substances 0.000 description 2
- 239000002966 varnish Substances 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 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
燃料噴射等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ガスケツト座
面との間に介装され、上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
圧力センサーに関し、更に詳しくはセンサーの金
属ケース内における電極及び圧電素子の収納構造
に係るものである。[Detailed description of the invention] [Field of industrial application] This invention is an intermediary between the cylinder head seating surface of the engine and the gasket seating surface of the spark plug, which generate vibrations due to combustion pressure, knocking, fuel injection, etc. of the internal combustion engine. The present invention relates to a gasket-type pressure sensor that detects pressure fluctuations caused by the vibrations using a piezoelectric element, and more particularly relates to a housing structure for electrodes and a piezoelectric element within a metal case of the sensor.
この種圧力センサーとしては、第２図の縦断面
図に示す如く、環状に形成された内部電極２と、
その上下に配された圧電素子３，３と、外側電極
４，４とからなる積層体５が金属ケース６内に収
納され、内部電極３に接続した出力取り出し用リ
ード線を金属ケース６の一端から導出させてなる
ものが知られており、上記リード線７の導出部分
が金属の保護パイプ８で被われてなる構造をもつ
もの、（例えば本出願人による実願昭59−147741
号）あるいは上記導出部分の保護パイプ８を合成
樹脂よりなるものとして金属ケース６とモールド
により接合してなるもの等の従来例がある。
As shown in the longitudinal cross-sectional view of FIG. 2, this type of pressure sensor includes an internal electrode 2 formed in an annular shape,
A laminate 5 consisting of piezoelectric elements 3, 3 arranged above and below and outer electrodes 4, 4 is housed in a metal case 6, and an output lead wire connected to the internal electrode 3 is connected to one end of the metal case 6. There are known devices in which the lead wire 7 has a structure in which the lead wire 7 is covered with a metal protective pipe 8 (for example, in Utility Model Application No. 59-147741 filed by the present applicant).
There is also a conventional example in which the protective pipe 8 of the lead-out portion is made of synthetic resin and is joined to the metal case 6 by molding.
ところで、上記せる如きこの種ガスケツト型圧
力センサー１の金属ケース６内における積層体５
は、従来その内側及び外側周面と、これらそれぞ
れの面に対向する金属ケース６の内面との間隙９
Ａ，９Ｂにシリコンワニス又はシリコンゴム等の
耐熱絶縁材を充填して金属ケース６内に収納され
ており、この絶縁材は比較的柔らかく充填時ある
いは金属ケースの端縁６Ａによるかしめ時に積層
体５の内部電極３や圧電素子４，４の層間にずれ
を生じ易く金属ケース６の内面に接触して絶縁が
損なわれたり出力精度に悪影響を及ぼすおそれが
ある為、積層体にずれを生じないような組付作業
を行なう必要があり作業効率が悪く量産性が阻害
される問題点があつた。
By the way, the laminate 5 in the metal case 6 of this type of gasket type pressure sensor 1 as described above is
Conventionally, the gap 9 between the inner and outer circumferential surfaces of the metal case 6 and the inner surface of the metal case 6 facing these respective surfaces is
A, 9B are filled with a heat-resistant insulating material such as silicone varnish or silicone rubber and housed in the metal case 6, and this insulating material is relatively soft and the laminate 5 is removed during filling or caulking with the edge 6A of the metal case. It is easy to cause misalignment between the internal electrodes 3 and the layers of the piezoelectric elements 4, 4, which may come into contact with the inner surface of the metal case 6, damaging the insulation and adversely affecting output accuracy. There was a problem in that it required a lot of assembly work, which led to poor work efficiency and hindered mass production.
本考案は上記問題点を解決するためになされた
もので、センサーの金属ケース内に収納された前
記電極及び圧電素子等よりなる積層体の内側周面
と金属ケースの内面との間隙にフツ素樹脂チユー
ブを嵌装して介在させると共に、積層体の外側周
面と金属ケースの内面側に耐熱絶縁材を充填し、
金属ケースの端縁でしめられてなるものとするこ
とにより、前記フツ素樹脂チユーブによつてセン
サーの組付時に積層体の層間に生じ易いずれを防
止するようにしたものである。
The present invention was devised to solve the above-mentioned problems. Fluorine is added to the gap between the inner peripheral surface of the laminate made of the electrodes, piezoelectric elements, etc. housed in the metal case of the sensor, and the inner surface of the metal case. A resin tube is fitted and interposed, and a heat-resistant insulating material is filled on the outer peripheral surface of the laminate and the inner surface of the metal case.
By tightening the metal case at the edge thereof, the fluororesin tube prevents the fluororesin tube from easily occurring between the layers of the laminate when the sensor is assembled.
第１図は本考案ガスケツト型圧力センサー１′
の実施例の要部を示す縦断面図で、第２図と同一
部分を同一符号で示したものである。
Figure 1 shows the gasket type pressure sensor 1' of the present invention.
FIG. 2 is a vertical cross-sectional view showing the main parts of the embodiment, in which the same parts as in FIG. 2 are designated by the same reference numerals.
図において５は、環状の内部電極２と圧電素子
３，３及び外側電極４，４が積層ねられてなる積
層体で、環状の金属ケース６内に挿入され、その
内側周面と金属ケース６の内面との間にフツ素樹
脂（米国デユポン社商品名テフロン）チユーブ１
０を嵌挿して介在させると共に、外側周面と金属
ケース６の内面との間隙９Ｂにシリコンワニス又
はシリコンゴム等の耐熱絶縁材を充填した後、金
属ケースの端縁６Ａでかしめ固定されてなる収納
構造を有するものである。 In the figure, reference numeral 5 denotes a laminate formed by laminating an annular internal electrode 2, piezoelectric elements 3, 3, and outer electrodes 4, 4, which is inserted into an annular metal case 6, and the inner peripheral surface of the annular metal case 6 and the metal case 6. Fluorine resin (trade name: Teflon, manufactured by DuPont, USA) tube 1
0 is inserted and interposed therebetween, and the gap 9B between the outer peripheral surface and the inner surface of the metal case 6 is filled with a heat-resistant insulating material such as silicone varnish or silicone rubber, and then caulked and fixed with the edge 6A of the metal case. It has a storage structure.
なお、上記フツ素樹脂チユーブ１０としては、
熱収縮タイプのものを用いるのがよく、装着後加
熱して収縮させることにより金属ケース６の内面
に確実に固定でき一層有効である。 In addition, as the above-mentioned fluororesin tube 10,
It is preferable to use a heat-shrinkable type, which is more effective because it can be reliably fixed to the inner surface of the metal case 6 by heating and shrinking it after installation.
以上説明せる如く本考案による圧力センサー
は、金属ケース内における電極及び圧電素子の積
層体の内側周面とケース内面間に介在するフツ素
樹脂チユーブにより、センサーの組付時において
積層体の層間に生じ易いずれを抑制することがで
きる為作業が容易化され作業効率を向上できるも
ので、従来の問題点を解決すると共に安定した性
能を有する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, the pressure sensor according to the present invention has a fluororesin tube interposed between the inner peripheral surface of the laminate of electrodes and piezoelectric elements in the metal case and the inner surface of the case. Since the tendency to occur can be suppressed, the work can be made easier and the work efficiency can be improved, and the gasket type pressure sensor can be provided as a gasket type pressure sensor that solves the conventional problems and has stable performance.
第１図は本考案ガスケツト型圧力センサーの要
部を示す実施例の縦断面図、第２図はガスケツト
型圧力センサーの従来例を示す縦断面図である。
１，１′……圧力センサー、２……内部電極、
３……圧電素子、４……外側電極、５……積層
体、６……金属ケース、６Ａ，６Ｂ……端縁、９
Ａ，９Ｂ……間隙、１０……フツ素樹脂チユー
ブ。
FIG. 1 is a longitudinal cross-sectional view of an embodiment of the gasket type pressure sensor of the present invention showing the essential parts, and FIG. 2 is a vertical cross-sectional view of a conventional example of the gasket type pressure sensor. 1, 1'...pressure sensor, 2...internal electrode,
3...Piezoelectric element, 4...Outer electrode, 5...Laminated body, 6...Metal case, 6A, 6B...Edge, 9
A, 9B...Gap, 10...Fluororesin tube.
Claims (1)
素子３，３及び外側電極４，４からなる積層体５
が環状の金属ケース６内に収納されてなり、エン
ジンヘツドの座面とスパークプラグのガスケツト
座面間に介装しエンジン燃焼室の圧力変動を検知
するガスケツト型圧力センサー１′において、前
記金属ケース６内における積層体５の内側周面と
金属ケース６の内面との間にフツ素樹脂チユーブ
１０が嵌挿されて介在すると共に、外側周面と金
属ケース６の外側内面との間隙９Ｂに耐熱絶縁材
が充填されて金属ケース６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。 A laminate 5 consisting of an annular internal electrode 2, piezoelectric elements 3, 3, and external electrodes 4, 4 arranged above and below the annular internal electrode 2.
is housed in an annular metal case 6, and is interposed between the seat surface of the engine head and the gasket seat of the spark plug to detect pressure fluctuations in the engine combustion chamber. A fluororesin tube 10 is inserted and interposed between the inner circumferential surface of the laminate 5 and the inner surface of the metal case 6 in the 6, and a heat-resistant tube 10 is provided in the gap 9B between the outer circumferential surface and the outer inner surface of the metal case 6. A gasket type pressure sensor characterized by being filled with an insulating material and housed in a metal case 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19005284U JPH0318901Y2 (en) | 1984-12-17 | 1984-12-17 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19005284U JPH0318901Y2 (en) | 1984-12-17 | 1984-12-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61104348U JPS61104348U (en) | 1986-07-02 |
| JPH0318901Y2 true JPH0318901Y2 (en) | 1991-04-22 |
Family
ID=30747499
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19005284U Expired JPH0318901Y2 (en) | 1984-12-17 | 1984-12-17 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0318901Y2 (en) |
-
1984
- 1984-12-17 JP JP19005284U patent/JPH0318901Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61104348U (en) | 1986-07-02 |
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