JPH0442753Y2 - - Google Patents
Info
- Publication number
- JPH0442753Y2 JPH0442753Y2 JP1985039799U JP3979985U JPH0442753Y2 JP H0442753 Y2 JPH0442753 Y2 JP H0442753Y2 JP 1985039799 U JP1985039799 U JP 1985039799U JP 3979985 U JP3979985 U JP 3979985U JP H0442753 Y2 JPH0442753 Y2 JP H0442753Y2
- Authority
- JP
- Japan
- Prior art keywords
- sleeve
- flange
- bushing member
- case
- piezoelectric
- 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
Landscapes
- Measuring Fluid Pressure (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
本考案は機関のシリンダ内圧力、すなわち、指
圧線図の計測に用いて好適な圧電型指圧計に関す
るものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a piezoelectric acupressure meter suitable for use in measuring the internal cylinder pressure of an engine, that is, the acupressure diagram.
一般に、機関のシリンダ内圧力を計測する指圧
計には、機械式、圧力平行式および電気式等があ
るが、その中でも小型で感度および応答性に優れ
た圧電型の指圧計が主として用いられている。
In general, there are mechanical, pressure parallel, and electric types of shiatsu gauges that measure the pressure inside an engine's cylinder, but piezoelectric shiatsu gauges are the most commonly used because they are small and have excellent sensitivity and responsiveness. There is.
第３図は従来の圧電型指圧計を示す側断面図で
ある。図において、１はステンレス等の金属材よ
りなる筒状のスリーブで、このスリーブ１の内底
面１ａには受圧力の変化に応じて電荷を発生する
圧電素子２，２が配置されている。そして、この
圧電素子２，２の下端部側に断面Ｌ字状の下部電
極３，３が密着固定されており、その上端部側に
も同様に断面Ｌ字状の上部電極４，４が密着固定
されている。そして、圧電素子２，２の上部電極
４，４同志を互いに密着させ、上部電極４，４の
上面に圧電素子２，２の発生する電荷を出力とし
て取り出す平板状のターミナル５が密接固定され
ている。さらに、このターミナル５の中央部には
絶縁被覆されたリード線６の一端が接続されてお
り、このリード線６の他端はスリーブ１の上面開
口に嵌挿されたブツシユ部材７の貫通孔７ａを通
して該指圧計の外部に導出されている。ブツシユ
部材７はステンレス等の金属材よりなり、このブ
ツシユ部材７は底面７ｂとこの底面７ｂに対向す
るターミナル５の上面５ａとの間には水晶あるい
はセラミツク等よりなるリング状のインシユレー
タ８が密着して設けられている。 FIG. 3 is a side sectional view showing a conventional piezoelectric acupressure meter. In the figure, reference numeral 1 denotes a cylindrical sleeve made of a metal material such as stainless steel, and piezoelectric elements 2, 2 are arranged on the inner bottom surface 1a of the sleeve 1, which generate electric charges according to changes in received pressure. Lower electrodes 3, 3 each having an L-shaped cross section are closely fixed to the lower end sides of the piezoelectric elements 2, 2, and upper electrodes 4, 4, each having an L-shaped cross section, are also tightly fixed to the upper end side of the piezoelectric elements 2, 2. Fixed. The upper electrodes 4, 4 of the piezoelectric elements 2, 2 are brought into close contact with each other, and a flat terminal 5 is closely fixed on the upper surface of the upper electrodes 4, 4 to take out the charge generated by the piezoelectric elements 2, 2 as an output. There is. Further, one end of an insulated lead wire 6 is connected to the center of the terminal 5, and the other end of the lead wire 6 is connected to a through hole 7a of a bushing member 7 inserted into an opening on the upper surface of the sleeve 1. It is led out to the outside of the acupressure meter through the acupressure meter. The bushing member 7 is made of a metal material such as stainless steel, and a ring-shaped insulator 8 made of crystal, ceramic, etc. is in close contact between the bottom surface 7b and the top surface 5a of the terminal 5 opposite to the bottom surface 7b. It is provided.
ところで、スリーブ１の外周壁面の上段部には
環状の鍔部ｂが一体に形成されており、該指圧計
組み立て時において、ブツシユ部材７を予め固定
状態としておいて、前記鍔部１ｂを図示せぬプリ
ロード加圧治具でもつて図示矢印方向に押圧しつ
つ、スリーブ１の上面開口部１ｃをブツシユ部材
７の外周面にスポツト溶接等により溶着固定して
いる。すなわち、スリーブ１に収納された圧電素
子２．２には常に所定圧力（プリロード）がかか
つた状態となつている。しかして、前記プリロー
ド加圧治具を取り去つた後、ステンレス等の金属
材よりなる外筒ケース９をブツシユ部材７に嵌合
し、外筒ケース９の上面開口部９ａとブツシユ部
材７の外周壁面との間にシーム溶接を施して両者
を溶着している。また、外筒ケース９の下端部に
は前記ブツシユ部材７とのシーム溶接の前、すな
わち外筒ケース９単位において、あるいは前記ブ
ツシユ部材７とのシーム溶接の後において、ダイ
ヤフラム１０が所定圧力でもつて押圧されつつ溶
着されている。尚、ダイヤフラム１０はステンレ
ス等の金属材により覆われており、外筒ケース９
の肉厚t1は圧電素子２に対する外部圧力の影響を
防ぐために充分な厚みを有している。すなわち、
外筒ケース９は高圧のガスに晒されて使用される
ものであり、この圧力（側圧力）の影響を防ぐた
めに所定厚t1に限定されている。 Incidentally, an annular flange b is integrally formed on the upper part of the outer peripheral wall surface of the sleeve 1, and when assembling the shiatsu gauge, the bushing member 7 is fixed in advance and the flange 1b is fixed as shown in the figure. The upper opening 1c of the sleeve 1 is welded and fixed to the outer circumferential surface of the bushing member 7 by spot welding or the like while pressing in the direction of the arrow shown in the figure with a preload pressing jig. That is, a predetermined pressure (preload) is always applied to the piezoelectric element 2.2 housed in the sleeve 1. After removing the preload pressurizing jig, the outer cylindrical case 9 made of a metal material such as stainless steel is fitted to the bushing member 7, and the upper surface opening 9a of the outer cylindrical case 9 and the outer periphery of the bushing member 7 are connected. Seam welding is performed between the wall and the wall to weld the two together. Further, a diaphragm 10 is attached to the lower end of the outer case 9 at a predetermined pressure before the seam welding with the bushing member 7, that is, in each outer case 9 or after the seam welding with the bushing member 7. Welded while being pressed. The diaphragm 10 is covered with a metal material such as stainless steel, and the outer case 9
The wall thickness t 1 is sufficient to prevent the influence of external pressure on the piezoelectric element 2 . That is,
The outer cylinder case 9 is used while being exposed to high pressure gas, and is limited to a predetermined thickness t1 to prevent the influence of this pressure (side pressure).
しかしながら、このような従来の指圧計による
と、図からも明らかな様に溶接箇所が３箇所有
り、溶接箇所が多い分だけその信頼性は低下する
ものであつた。また、スリーブ１の上面開口部１
1cとブツシユ部材７との溶接代を確保するため
に、スリーブ１は鍔部1bよりも上方に長く形成
しなければならず、その分指圧計全体の長さが長
くなるものであつた。
However, with such a conventional acupressure gauge, there are three welding points as is clear from the figure, and the reliability decreases as the number of welding points increases. In addition, the upper opening 1 of the sleeve 1
In order to secure a welding allowance between 1c and the bushing member 7, the sleeve 1 must be formed longer than the flange 1b, which increases the overall length of the shiatsu gauge.
さらに、スリーブ１は圧電素子２へプリロード
をかけるために充分な鍔部１ｂの径方向の長さを
必要としており、この鍔部１ｂがあるために指圧
計全体の外径が大きくなつてしまうものであつ
た。すなわち、指圧計全体の外径は６mmと極めて
小径であり、この外径に占める前記鍔部１ｂの割
合はかなり大きなものであつた。このため、後加
工でもスリーブ１の鍔部１ｂを予め削り落として
しまい。外径を極力小さくしようとした指圧計も
ある。しかし、このようにすると生産効果率が低
下してしまい、コストがアツプしてしまうもので
あつた。 Furthermore, the sleeve 1 requires a sufficient radial length of the flange 1b to apply a preload to the piezoelectric element 2, and the presence of this flange 1b increases the outer diameter of the entire shiatsu meter. It was hot. That is, the outer diameter of the entire acupressure meter was extremely small, 6 mm, and the ratio of the flange portion 1b to this outer diameter was quite large. For this reason, the flange portion 1b of the sleeve 1 is scraped off in advance even in post-processing. There are also acupressure gauges whose outer diameter has been made as small as possible. However, doing so would reduce production efficiency and increase costs.
本考案はこのような点に鑑みてなされたもの
で、外筒ケースの内周壁面上部側に内段部を設
け、この内段部をスリーブの上面開口縁周部に形
成した鍔部の下面側に圧接位置させ、この内段部
の鍔部への押圧付勢力により、スリーブの上面開
口部をブツシユ部材に嵌合させて、圧電素子にプ
リロードをかけるようにしたものである。
The present invention has been developed in view of these points. An inner step is provided on the upper side of the inner circumferential wall of the outer cylinder case, and this inner step is formed on the lower surface of the flange formed around the upper opening edge of the sleeve. The upper surface opening of the sleeve is fitted into the bushing member by the pressing force applied to the flange of the inner step, thereby applying a preload to the piezoelectric element.
したがつて本考案による指圧計によると、スリ
ーブとブツシユ部材とを溶着固定することなく、
常に一定のプリロードを圧電素子にかけるこがで
きる。
Therefore, according to the acupressure meter according to the present invention, the sleeve and the bushing member are not fixed by welding.
A constant preload can always be applied to the piezoelectric element.
以下、本考案に係わる圧電型指圧計を詳細に説
明する。第１図はこの指圧計の一実施例を示す側
断面図である。同図において第３図と同一符号は
同一部材を示しその説明は省略する。図におい
て、１１はステンレス等の金属材より形成される
有底筒状のスリーブで、その上面開口部縁周部に
は、外方に向けて鍔部１１ａが一体に形成されて
いる。また、このスリーブ１１の内底面１１ｂの
上面にはアルミニウム等より形成されると共に該
材質の線膨張率を利用して指圧計の温度補佐をな
す温度補正用マス１２が載置されており、この温
度補正用マス１２の上面に圧電素子２，２が配置
されている。また、スリーブ１１の下端面１１ｃ
は凸状に突出しており、この下端面１１ｃの突出
面がダイヤフラム１０に密着している。１３はス
テンレス等の金属材よりなる外筒ケースであり、
その内周壁面上部側には内段面１３ａが形成され
ており、この内段面１３ａを含む肉厚t2が第３図
における内厚t1に等しく設定されている。また、
この内段面１３ａはスリーブ１１の鍔部１１ａに
係合するようになつており、該指圧計組み立て時
において、ブツシユ部材７を予め固定状態として
おいて、前記鍔部１１ａに前記内段面１３ａを係
合させつつ、外筒ケース１３を図示矢印方向に押
圧付勢し、外筒ケース１３の上面開口部１３ｂを
ブツシユ部材７の外周壁面にYAGレーザおるい
は電子ビーム等によるシーム溶接を施して溶着固
定している。すなわち、スリーブ１１は外筒ケー
ス１３の内段面１３ａでもつて支持固定されてお
り、スリーブ１１とブツシユ部材７とは嵌合状態
となつている。つまり、従来の様なスポツト溶接
等による溶着は行なわれておらず、スリーブ１１
の鍔部１１ａに圧接する外筒ケース１３の内段面
１３の押圧付勢力によつて圧電素子２，２に常に
一定のプリロードがかかつている。
Hereinafter, the piezoelectric acupressure meter according to the present invention will be explained in detail. FIG. 1 is a side sectional view showing one embodiment of this shiatsumeter. In this figure, the same reference numerals as in FIG. 3 indicate the same members, and the explanation thereof will be omitted. In the figure, reference numeral 11 denotes a bottomed cylindrical sleeve made of a metal material such as stainless steel, and a flange 11a is integrally formed on the periphery of the upper opening of the sleeve 11 facing outward. Further, on the upper surface of the inner bottom surface 11b of this sleeve 11, a temperature correction mass 12 is placed, which is made of aluminum or the like and makes use of the coefficient of linear expansion of the material to assist in the temperature of the shiatsu gauge. Piezoelectric elements 2, 2 are arranged on the upper surface of the temperature correction mass 12. In addition, the lower end surface 11c of the sleeve 11
protrudes in a convex shape, and the protruding surface of the lower end surface 11c is in close contact with the diaphragm 10. 13 is an outer cylinder case made of metal material such as stainless steel;
An inner stepped surface 13a is formed on the upper side of the inner peripheral wall surface, and a wall thickness t2 including this inner stepped surface 13a is set equal to the inner thickness t1 in FIG. 3. Also,
This inner step surface 13a is adapted to engage with the flange portion 11a of the sleeve 11, and when assembling the shiatsu gauge, the bush member 7 is fixed in advance and the inner step surface 13a is engaged with the flange portion 11a. While engaging the outer cylinder case 13, the outer cylinder case 13 is pressed in the direction of the arrow shown in the figure, and the upper opening 13b of the outer cylinder case 13 is seam welded to the outer peripheral wall surface of the bushing member 7 using a YAG laser or an electron beam. It is fixed by welding. That is, the sleeve 11 is also supported and fixed by the inner stage surface 13a of the outer cylinder case 13, and the sleeve 11 and the bushing member 7 are in a fitted state. In other words, the sleeve 11 is not welded by conventional spot welding or the like.
A constant preload is always applied to the piezoelectric elements 2, 2 by the pressing force of the inner stage surface 13 of the outer cylinder case 13 which is in pressure contact with the flange 11a.
尚、外筒ケース１３の下端部には前記ブツシユ
部材７とのシーム溶接の前、すなわち外筒ケース
１３単体において、あるいは前記ブツシユ部材７
とのシーム溶接の後において、ダイヤフラム１０
が所定圧力でもつて押圧されつつ溶着されてい
る。 It should be noted that the lower end of the outer cylinder case 13 is attached before the seam welding with the bushing member 7, that is, in the outer cylinder case 13 alone or with the bushing member 7.
After seam welding with the diaphragm 10
are welded while being pressed with a predetermined pressure.
したがって、この指圧計における溶接箇所は図
からも明らかなように２箇所となり、従来に比し
て溶接箇所の信頼性は向上する。また、スリーブ
１１はブツシユ部材７に溶接固定しなくてもよい
ので、従来の様に溶接代は確保する必要はなく、
長手方向に短くすることができ、その分指圧計全
体の長さを短くすることができる。さらに、スリ
ーブ１１に鍔部１１ａを外筒ケース１３の内段面
１３ａで受けるようにしたので、鍔部１１ａの外
径方向の長さの一部を外筒ケース１３の肉圧t2で
吸収することができ、指圧計全体の外径を小さく
することができる。 Therefore, as is clear from the figure, there are two welding points in this shiatsumeter, and the reliability of the welding points is improved compared to the conventional one. Further, since the sleeve 11 does not need to be fixed to the bushing member 7 by welding, there is no need to secure a welding allowance as in the conventional case.
It can be shortened in the longitudinal direction, and the overall length of the shiatsumeter can be shortened accordingly. Furthermore, since the flange 11a of the sleeve 11 is received by the inner surface 13a of the outer case 13, part of the length of the flange 11a in the outer radial direction is absorbed by the wall pressure t2 of the outer case 13. Therefore, the outer diameter of the entire shiatsu meter can be reduced.
第２図は指圧計の他の実施例を示す側断面図で
ある。同図において、第１図と同一符号は同一部
材を示しその説明は省略する。この指圧計の外筒
ケース１４は、筒状のケース１５とこのケース１
５の内周壁面に添つて挿入固定されたステンレス
等の金属材よりなるパイプ１６とで構成されてお
り、パイプ１６の上端面１６ａが第１図における
内段面１３ａの役目を果たしている。すなわち、
ケース１５の肉厚とパイプ１６の肉厚とを合わし
た肉厚t3が第１図における肉厚t2と同じく設定さ
れており、該指圧計組み立て時において、ケース
１５単体予めブツシユ部材７にシーム溶接にて溶
着固定しておいて、このケース１５の内周壁面に
添つてパイプ１６を、その上端面１６ａとスリー
ブ１１の鍔部１１ａを係合させつつ挿入し、図示
矢印方向に押圧してスリーブ１１とブツシユ部材
７とを嵌合させている。そして、パイプ１６の下
端面とケース１５の下端面とが一致した時点で、
この下端面同志を溶着し、その後ダイヤフラム１
０を所定圧力でもつて押圧しつつケース１５にシ
ーム溶接している。このように、パイプ１６の上
端面１６ａでもつてスリーブ１１の鍔部１１を常
時押圧付勢するようにしてスリーブ１１を支持固
定し、圧電素子２，２にプリロードをかけるよう
にしてもよい。 FIG. 2 is a side sectional view showing another embodiment of the acupressure meter. In this figure, the same reference numerals as in FIG. 1 indicate the same members, and the explanation thereof will be omitted. The outer case 14 of this shiatsu gauge includes a cylindrical case 15 and this case 1.
A pipe 16 made of a metal material such as stainless steel is inserted and fixed along the inner peripheral wall surface of the pipe 16, and the upper end surface 16a of the pipe 16 serves as the inner step surface 13a in FIG. That is,
The wall thickness t3 , which is the sum of the wall thickness of the case 15 and the wall thickness of the pipe 16, is set to be the same as the wall thickness t2 in FIG. The pipe 16 is fixed by seam welding, and the pipe 16 is inserted along the inner peripheral wall surface of the case 15 while engaging the upper end surface 16a of the pipe 16 with the flange 11a of the sleeve 11, and is pressed in the direction of the arrow shown in the figure. The sleeve 11 and the bushing member 7 are fitted together. Then, when the lower end surface of the pipe 16 and the lower end surface of the case 15 match,
Weld these lower end faces together, and then diaphragm 1
0 is seam-welded to the case 15 while being pressed with a predetermined pressure. In this way, the upper end surface 16a of the pipe 16 may always press and bias the collar portion 11 of the sleeve 11 to support and fix the sleeve 11, thereby applying a preload to the piezoelectric elements 2, 2.
以上説明したように本考案による圧電指圧計に
よると、外筒ケースの内周壁面上部側に内段部を
設け、この内段部をスリーブの上面開口縁周部に
形成した鍔部の下面側に圧接位置させ、この内段
部の鍔部への押圧付勢力より、スリーブの上面開
口部をブツシユ部材に嵌合させて、圧電素子にプ
リロードをかけるようにしたのでスリーブとブツ
シユ部材との溶接工程を省略することができ、製
品自体の信頼性を高めると共に生産効率を向上さ
せることができる。また、スリーブに溶接代を設
ける必要がなく、スリーブの鍔部も内段部で吸収
するようにすることも可能である製品自体をコン
パクトにすることができる。
As explained above, according to the piezoelectric acupressure meter according to the present invention, an inner step is provided on the upper side of the inner peripheral wall of the outer cylinder case, and this inner step is formed on the lower surface of the flange formed around the upper opening edge of the sleeve. The upper opening of the sleeve is fitted into the bushing member by the pressing force applied to the flange of the inner stage, and a preload is applied to the piezoelectric element. It is possible to omit a process, increase the reliability of the product itself, and improve production efficiency. Further, there is no need to provide a welding allowance on the sleeve, and the flange of the sleeve can also be absorbed by the inner step, making it possible to make the product itself more compact.
第１図は本考案に係る圧電型指圧計の一実施例
を示す側断面図、第２図はこの指圧計の他の実施
例を示す側断面図、第３図は従来の指圧計を示す
側断面図である。
２……圧電素子、７……ブツシユ部材、１１…
…スリーブ、１１ａ……鍔部、１３，１４……外
筒ケース、１３ａ……内段面、１６……パイプ、
１６……上端面。
Fig. 1 is a side sectional view showing one embodiment of the piezoelectric shiatsumeter according to the present invention, Fig. 2 is a side sectional view showing another embodiment of this shiatsumeter, and Fig. 3 is a conventional shiatsumeter. FIG. 2... Piezoelectric element, 7... Bushing member, 11...
... Sleeve, 11a ... Flange, 13, 14 ... Outer cylinder case, 13a ... Inner stage surface, 16 ... Pipe,
16...Top end surface.
Claims (1)
鍔部を有し、かつその内方に圧電素子を収納して
なる有底筒状のスリーブと、 その内周壁面上部側に内段部を設け、その上面
開口部がブツシユ部材に嵌合固定された外筒ケー
スとを備え、 前記内段部が前記鍔部の下面側に圧接位置し、
この内段部の鍔部への押圧付勢力により、前記ス
リーブの上面開口部が前記ブツシユ部材に嵌合さ
れて、前記圧電素子にプリロードがかけられてい
る。 事を特徴とする圧電型指圧計。[Claims for Utility Model Registration] A bottomed cylindrical sleeve having a flange facing outward around the periphery of an opening on its top surface and housing a piezoelectric element inside the flange; an outer cylindrical case having an inner step provided on the upper side of the inner circumferential wall surface and an upper opening of which is fitted and fixed to the bushing member, the inner step being positioned in pressure contact with the lower surface of the flange;
Due to the pressing force of the inner step against the flange, the upper opening of the sleeve is fitted into the bushing member, and a preload is applied to the piezoelectric element. A piezoelectric acupressure meter with the following characteristics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985039799U JPH0442753Y2 (en) | 1985-03-22 | 1985-03-22 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985039799U JPH0442753Y2 (en) | 1985-03-22 | 1985-03-22 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61157843U JPS61157843U (en) | 1986-09-30 |
| JPH0442753Y2 true JPH0442753Y2 (en) | 1992-10-09 |
Family
ID=30548085
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1985039799U Expired JPH0442753Y2 (en) | 1985-03-22 | 1985-03-22 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0442753Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014173995A (en) * | 2013-03-08 | 2014-09-22 | Denso Corp | Pressure sensor and manufacturing method thereof |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6171251B2 (en) * | 2013-09-06 | 2017-08-02 | 株式会社Ｓｏｋｅｎ | Pressure detection device |
| JP6300354B2 (en) * | 2014-05-12 | 2018-03-28 | 株式会社Ｓｏｋｅｎ | Pressure detection device |
| JP2015219131A (en) * | 2014-05-19 | 2015-12-07 | 株式会社デンソー | Pressure detection device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57122334A (en) * | 1981-01-22 | 1982-07-30 | Nippon Soken Inc | Pressure sensor |
-
1985
- 1985-03-22 JP JP1985039799U patent/JPH0442753Y2/ja not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014173995A (en) * | 2013-03-08 | 2014-09-22 | Denso Corp | Pressure sensor and manufacturing method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61157843U (en) | 1986-09-30 |
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