JPH0265084A - Pressure sensor-built-in spark plug - Google Patents
Pressure sensor-built-in spark plugInfo
- Publication number
- JPH0265084A JPH0265084A JP21477888A JP21477888A JPH0265084A JP H0265084 A JPH0265084 A JP H0265084A JP 21477888 A JP21477888 A JP 21477888A JP 21477888 A JP21477888 A JP 21477888A JP H0265084 A JPH0265084 A JP H0265084A
- Authority
- JP
- Japan
- Prior art keywords
- insulator
- pressure sensor
- electrode plate
- built
- terminal
- 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
- 239000002184 metal Substances 0.000 claims abstract description 33
- 239000012212 insulator Substances 0.000 claims abstract description 25
- 239000000463 material Substances 0.000 claims abstract description 4
- 238000005245 sintering Methods 0.000 claims description 2
- 239000004020 conductor Substances 0.000 abstract description 9
- 239000011810 insulating material Substances 0.000 description 3
- 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
- 230000002860 competitive effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
Landscapes
- Spark Plugs (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野)
この発明は、内燃機関に使用される圧力センサー内蔵の
スパークプラグに関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a spark plug with a built-in pressure sensor used in an internal combustion engine.
(従来の技術)
従来、内燃機関に使用される圧力センサー内蔵のスパー
クプラグにおいては、圧力センサーは絶縁物によって被
覆された圧電素子を主体金具の胴部に穿設した孔部に圧
入、固定し、上記圧電素子から検出される信号をリード
線によってCPU等に伝達してなるものである。(Prior art) Conventionally, in spark plugs with a built-in pressure sensor used in internal combustion engines, the pressure sensor is a piezoelectric element covered with an insulating material that is press-fitted into a hole drilled in the body of the metal shell and fixed. , a signal detected from the piezoelectric element is transmitted to a CPU or the like through a lead wire.
(発明が解決しようとする課題)
しかしながら、上記従来のものにおいて、絶縁物によっ
て被覆された圧電素子を主体金具の胴部に穿設した孔部
に圧入、固定し、上記圧電素子から検出される信号をリ
ード線によってCPtJ等に伝達してなるものは、圧電
素子によって検出される信号をCPUに伝達するリード
線が、主体金具の上方から引出されていることから、内
燃機関から発生する振動や熱によって劣化を受けやすく
、接触不良や断線等の破損を生じ易い欠点がある。(Problem to be Solved by the Invention) However, in the above conventional device, a piezoelectric element covered with an insulating material is press-fitted and fixed into a hole drilled in the body of the metal shell, and the piezoelectric element is detected from the piezoelectric element. In the case where signals are transmitted to the CPtJ etc. by lead wires, the lead wires that transmit the signals detected by the piezoelectric element to the CPU are drawn out from above the metal shell. It is susceptible to deterioration due to heat and has the disadvantage of being prone to damage such as poor contact and disconnection.
この欠点を改良するために、上記リード線に代え金属ペ
ーストを絶縁体の表面に焼結させて導通体を形成し、上
記絶縁体の表面に周設した電極端子から信号を取り出す
ものが提案されているが、圧電素子に挟持される電極板
との間における接触が、機械的応力を加えながら行うも
のでないから、その接触か確実にならないという問題が
ある。そこで、この発明は上記従来のもののもつ欠点を
改善するものであり、絶縁体表面に焼結される金属ペー
ストと電極板との接続を長期にわたり確保にしようとす
るものである。In order to improve this drawback, it has been proposed to sinter metal paste on the surface of an insulator instead of the lead wire to form a conductor, and to extract signals from electrode terminals provided around the surface of the insulator. However, since the contact between the piezoelectric element and the electrode plate sandwiched between the piezoelectric elements is not performed while applying mechanical stress, there is a problem that the contact is not reliable. Therefore, the present invention aims to improve the above-mentioned drawbacks of the conventional method, and aims to ensure a long-term connection between the metal paste sintered on the surface of the insulator and the electrode plate.
(課題を解決するための手段)
そのために、主体金具の胴部にバネ材よりなる電極板と
圧電素子よりなる圧力センサーを、一対のくさびによっ
て固定すると共に、上記電極板より絶縁体に向け引出さ
れる弾性を有する端子を主体金具と絶縁して、絶縁体表
面に金属ペーストの焼結により形成される導通体に圧着
させてなるものである。(Means for solving the problem) To this end, an electrode plate made of a spring material and a pressure sensor made of a piezoelectric element are fixed to the body of the metal shell with a pair of wedges, and the electrode plate is pulled out from the electrode plate toward the insulator. The terminal is insulated from the metal shell and is crimped onto a conductor formed by sintering a metal paste on the surface of the insulator.
(作用)
上記構成を具えるので、主体金具の胴部にバネ材の電極
板と圧電素子よりなる圧力センサーを、くさびの打ち込
みによって上下方向を固定すると共に、プラグの絶縁体
に向け引出される電極板に連結する弾性を有する端子が
、絶縁物により主体金具と絶縁されてスパークプラグの
径方向に対して押圧され、絶縁体の表面に焼結された金
属ペーストよりなる導通体に圧着固定して長期にわたり
その接続を確保できるものである。(Function) With the above configuration, the pressure sensor consisting of a spring electrode plate and a piezoelectric element is fixed in the vertical direction by driving a wedge into the body of the metal shell, and the pressure sensor is pulled out toward the insulator of the plug. An elastic terminal connected to the electrode plate is insulated from the metal shell by an insulator, pressed against the radial direction of the spark plug, and crimped and fixed to a conductor made of metal paste sintered on the surface of the insulator. The connection can be secured over a long period of time.
(実施例)
この発明を図に示す実施例により更に説明する(1)は
、この発明の実施例である圧力センサー内蔵スパークプ
ラグであり、この圧力センサー内蔵スパークプラグ(1
)は、主体金具(3〉の胴部(4)に内蔵された圧力セ
ンサー(5)と、圧力センサー(5)からの信号を取り
出す電極端子(6)を周設する絶縁体(2)、上記主体
金具(3)の先端に具えられたネジ部(1,4) 、中
心電極(15)、外側電極(16)等から構成されるも
のである。そして、圧力センサー(5)は、バネ材より
なる電極板(7)を2個の圧電素子(8)により挟持し
て構成し、主体金具(3)の胴部(4)に設けられる収
容溝部(10)内に、互いに対向する方向に傾斜面をも
つ一対のくさび(9)(9)を打ち込むことによって、
上記収容溝(10)内に圧力センサーを固定し、そのう
ちの電極板(7)より絶縁体(2〉に向い引出される端
子(12)は、絶縁物(12)によって主体金具(3)
と絶縁されながら、絶縁体(2)表面に焼結され、絶縁
体(2)に周設される電極端子(6)に導通する金属ペ
ースト(13)面に圧着することにより固定接続してな
るものである。さらに、金属ペースト(13)と電極板
(7)から引出される端子(11)との間の接続は、圧
電素子(8)を固定するために互いに対向して傾斜面を
もつくさび(9)(9)を打ち込むことによって上下方
向に作用する力(F)が生じ上下方向が固定された上、
内方に向う力(f)により圧着しく第4図)、端子(1
1)の導通体(13)への弾性接触により確実に電気的
に接続されるものである。なお、電極板(7)の周囲に
は電気的に絶縁を行う例えばゴムのような絶縁物(11
)があるから、主体金具(3〉との間の絶縁は十分なも
のとなり、主体金具く3)との電気的干渉を防ぐことが
できる。(Example) This invention will be further explained with reference to an example shown in the drawings. (1) is a spark plug with a built-in pressure sensor which is an example of the present invention.
) is an insulator (2) that surrounds a pressure sensor (5) built into the body (4) of the metal shell (3) and an electrode terminal (6) for taking out a signal from the pressure sensor (5); It is composed of threaded parts (1, 4) provided at the tip of the metal shell (3), a center electrode (15), an outer electrode (16), etc. The pressure sensor (5) is mounted on a spring. An electrode plate (7) made of a material is sandwiched between two piezoelectric elements (8), and the two piezoelectric elements (8) are placed in a housing groove (10) provided in the body (4) of the metal shell (3) in directions facing each other. By driving a pair of wedges (9) (9) with inclined surfaces into the
A pressure sensor is fixed in the housing groove (10), and the terminal (12) drawn out from the electrode plate (7) toward the insulator (2>) is connected to the metal shell (3) by the insulator (12).
The metal paste (13) is sintered onto the surface of the insulator (2) and is electrically connected to the electrode terminal (6) provided around the insulator (2) while being insulated from the insulator (2). It is something. Furthermore, the connection between the metal paste (13) and the terminal (11) drawn out from the electrode plate (7) is made using wedges (9) having inclined surfaces facing each other in order to fix the piezoelectric element (8). By driving (9), a force (F) acting in the vertical direction is generated, and the vertical direction is fixed,
The inward force (f) causes the terminal to be crimped (Fig. 4), and the terminal (1
1) The elastic contact with the conductor (13) ensures reliable electrical connection. In addition, an insulating material (11) such as rubber for electrical insulation is placed around the electrode plate (7).
), the insulation between the metal shell (3) and the metal shell (3) is sufficient, and electrical interference with the metal shell (3) can be prevented.
(発明の効果)
以上のとおり、内蔵圧力センサーの電極板から引出され
る弾性のある端子を、絶縁体表面に焼結される金属ペー
ストの導通体に圧着し、更にはくさびを打ち込むことに
より主体金具を固定できるものであり、従来のものにく
らべ簡単な構造のものとすることによる信頼性の向上や
リード線の廃止による収り扱い時の作業性を簡単にし、
しかも圧力センサーと導通体の接触を永久的に確保でき
。(Effects of the Invention) As described above, the elastic terminal drawn out from the electrode plate of the built-in pressure sensor is crimped to the conductor made of metal paste sintered on the surface of the insulator, and a wedge is driven into the main body. The metal fittings can be fixed, and it has a simpler structure than conventional ones, which improves reliability and eliminates lead wires, making it easier to handle when storing.
Furthermore, contact between the pressure sensor and the conductor can be permanently ensured.
る優れた効果を有するものである。It has excellent effects.
第1図は、この発明の実施例である圧力センサー内蔵ス
パークプラグの部分断面図、第2図及び第3図は、その
正面方向からの要部拡大断面図及び側面方向からの要部
拡大正断面図を示し、第4図は、圧力センサーの構成を
示す分解斜視図である。
1・・・圧力センサー内蔵スパークプラグ 2・・・絶
縁体 3・・・主体金具 4・・・胴部 5・・・圧カ
センサー
6・・・電極端子
・・くさび
2 ・・・ 争色縁才勿
7・・・電極板
8・・・圧電素
0・・・収容溝
1・・・端子
金属ペーストよりなる導
通1本FIG. 1 is a partial sectional view of a spark plug with a built-in pressure sensor, which is an embodiment of the present invention, and FIGS. A sectional view is shown, and FIG. 4 is an exploded perspective view showing the configuration of the pressure sensor. 1... Spark plug with built-in pressure sensor 2... Insulator 3... Metal shell 4... Body 5... Pressure sensor 6... Electrode terminal... Wedge 2... Competitive connection Of course 7...Electrode plate 8...Piezoelectric element 0...Accommodating groove 1...1 conductor made of terminal metal paste
Claims (1)
なる圧力センサーを、一対のくさびによって固定すると
共に、上記電極板より絶縁体に向け引出される弾性を有
する端子を絶縁物を介して主体金具と絶縁して、絶縁体
表面に金属ペーストの焼結により形成される導通体に圧
着させてなる圧力センサー内蔵スパークプラグ。An electrode plate made of a spring material and a pressure sensor made of a piezoelectric element are fixed to the body of the metal shell with a pair of wedges, and an elastic terminal drawn out from the electrode plate toward the insulator is inserted through the insulator. A spark plug with a built-in pressure sensor that is insulated from the main metal fitting and crimped onto a conductive body formed by sintering metal paste on the surface of the insulator.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21477888A JP2791891B2 (en) | 1988-08-31 | 1988-08-31 | Spark plug with built-in pressure sensor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21477888A JP2791891B2 (en) | 1988-08-31 | 1988-08-31 | Spark plug with built-in pressure sensor |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0265084A true JPH0265084A (en) | 1990-03-05 |
JP2791891B2 JP2791891B2 (en) | 1998-08-27 |
Family
ID=16661379
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP21477888A Expired - Fee Related JP2791891B2 (en) | 1988-08-31 | 1988-08-31 | Spark plug with built-in pressure sensor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2791891B2 (en) |
-
1988
- 1988-08-31 JP JP21477888A patent/JP2791891B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JP2791891B2 (en) | 1998-08-27 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |