JPS63251724A - Ceramic glow plug - Google Patents
Ceramic glow plugInfo
- Publication number
- JPS63251724A JPS63251724A JP8463687A JP8463687A JPS63251724A JP S63251724 A JPS63251724 A JP S63251724A JP 8463687 A JP8463687 A JP 8463687A JP 8463687 A JP8463687 A JP 8463687A JP S63251724 A JPS63251724 A JP S63251724A
- Authority
- JP
- Japan
- Prior art keywords
- outer cylinder
- metal outer
- coil
- inner cavity
- side 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
- 239000000919 ceramic Substances 0.000 title claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 30
- 229910052751 metal Inorganic materials 0.000 claims abstract description 30
- 239000002184 metal Substances 0.000 claims abstract description 30
- 238000005219 brazing Methods 0.000 abstract description 8
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 abstract description 7
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 abstract 2
- 229910052709 silver Inorganic materials 0.000 abstract 2
- 239000004332 silver Substances 0.000 abstract 2
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 238000000926 separation method Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は主としてディーゼルエンジンに装着され、エン
ジンヘッドに設けられた副燃焼室等を予熱するセラミッ
クグロープラグに関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a ceramic glow plug that is mainly installed in a diesel engine and preheats a sub-combustion chamber or the like provided in an engine head.
（従来の技術）
一般にディーゼルエンジンは特に低温時等における始動
性が悪いために、エンジンヘッドに設けた副燃焼室等に
グロープラグを装着し、これに通電してヒータを赤熱さ
せ室内に噴射される燃料の一部を燃焼させて予熱する方
法がとられており、近時においては始動後においても燃
焼安定化のためのアフターグローとして長時間使用され
る傾向となっており、その耐久性の向上が益々望まれて
いる。この種グロープラグとしては高融点金属の発熱線
をセラミック焼結体中に埋設してなるセラミックヒータ
を発熱体としたポデーアース型のセラミックグロープラ
グが知られており、その−例として、第２図に縦断面図
で示す如き構造のものがある。同図において、発熱体と
なるセラミックヒータ（以下単にヒータという）ｌは、
発熱線２がセラミック焼結体中に埋設されたものであり
、ヒータ１の後端部においては、発熱線２の■側端２ａ
が裸出され、中軸３に接続されているリード線４の、ヒ
ータ１の後端部外周に環装されているコイル状端部４ａ
にろう付され、かつ、金属外筒５の内腔に位置するよう
発熱綿２のθ側端２ｂが表面に裸出され、さらにヒータ
ｌの中間部分が金属外筒５の内腔にろう付６によって固
着されて発熱体組立体７が構成されている。該発熱体組
立体７が取付金具８の先端部内腔にろう付９によって固
着され、中軸３が取付金具８の後端部内腔にガラス封着
１０によって固着されてセラミックグロープラグが構成
されている。(Prior art) Diesel engines generally have poor starting performance, especially at low temperatures, so a glow plug is attached to the auxiliary combustion chamber provided in the engine head, and electricity is applied to the glow plug to make the heater red-hot and inject the fuel into the interior. In recent years, there has been a tendency for the fuel to be used for long periods of time as an afterglow to stabilize combustion even after startup, and its durability has increased. Improvements are increasingly desired. As this type of glow plug, a Podearth type ceramic glow plug is known, which uses a ceramic heater as a heating element, which is made by embedding a heating wire of a high-melting point metal in a ceramic sintered body. There is a structure as shown in the vertical cross-sectional view. In the figure, a ceramic heater (hereinafter simply referred to as a heater) l serving as a heating element is
The heating wire 2 is embedded in the ceramic sintered body, and at the rear end of the heater 1, the side end 2a of the heating wire 2 is
The coiled end 4a of the lead wire 4, which is exposed and connected to the center shaft 3, is looped around the outer periphery of the rear end of the heater 1.
The θ side end 2b of the heating cotton 2 is exposed on the surface so that it is brazed to the inner cavity of the metal outer cylinder 5, and the intermediate part of the heater l is further brazed to the inner cavity of the metal outer cylinder 5. 6, a heating element assembly 7 is constructed. The heating element assembly 7 is fixed to the lumen at the tip end of the mounting bracket 8 by brazing 9, and the center shaft 3 is fixed to the lumen at the rear end of the mounting bracket 8 by a glass seal 10, thereby forming a ceramic glow plug. .
（発明が解決しようとする問題点）
前述の如く、発熱体組立体７を取付金具８の内腔に装入
し、発熱体組立体７の金属外筒５を取付金具８の先端部
内腔にろう付９によって固着すると、発熱線２と金属外
筒５との間の導通がなくなるという問題を生じた。これ
はろう付９のための外部からの加熱によって、ろう付６
が軟化するとともに金属外筒５が膨張し、金属外筒内壁
にろう付６によって固着されている発熱線２のｅ側端２
ｂが引っ張られ離脱することが原因であることが判った
。(Problems to be Solved by the Invention) As described above, the heating element assembly 7 is inserted into the inner cavity of the mounting bracket 8, and the metal outer cylinder 5 of the heating element assembly 7 is inserted into the inner cavity of the distal end of the mounting bracket 8. If the wires were fixed by brazing 9, a problem occurred in that electrical continuity between the heating wire 2 and the metal outer cylinder 5 was lost. This is done by external heating for brazing 9,
is softened and the metal outer cylinder 5 expands, and the e side end 2 of the heating wire 2 is fixed to the inner wall of the metal outer cylinder by brazing 6.
It was found that the cause was b being pulled and detached.
（問題点を解決するための手段及び作用）本発明は前記
の如き問題点を解決するためになされたものであり、発
熱線のｅ側端を金属外筒の内腔ではなく金属外筒上面と
発熱線の■側端との間で裸出させ、この外側に金属外筒
後端縁に隣接してコイルを環装し、発熱線のｅ側端、コ
イルおよび金属外筒をろう付けして発熱線と金属外筒及
び取付金具との間の導通を確保するものである。(Means and effects for solving the problems) The present invention has been made to solve the above-mentioned problems. and the ■ side end of the heating wire, a coil is encased on the outside adjacent to the rear edge of the metal outer cylinder, and the E side end of the heating wire, the coil, and the metal outer cylinder are brazed. This ensures continuity between the heating wire, the metal outer cylinder, and the mounting bracket.
上記コイルの代わりにパイプを用いることも考えられる
が、取付金具ろう何時の熱による金属外筒の膨張の影響
を緩和するためには上記の如くコイルを用いることが好
ましい。Although it is possible to use a pipe instead of the coil, it is preferable to use a coil as described above in order to alleviate the effect of expansion of the metal outer cylinder due to heat during soldering of the fitting.
（実施例）
第１図は、本発明によるセラミックグロープラグの実施
例の縦断面図であり、同図において、従来例の第２図と
同一部分は同一符号にて示しであるが、ヒータ１の後端
外周にはリード線４のコイル状端部４ａと、金属外筒５
を装着した際金属外筒後端面に隣接するようコイル１１
が環装されたヒータ１を、金属外筒５の内腔に挿入して
所定の位置にセントし、コイル状端部４ａ、コイル１１
及び金属外筒５の内腔にそれぞれ銀ろうをセットしてＨ
！ガス雰囲気炉中で銀ろうを溶かしてろう付して発熱線
２の■側端子２ａとリード線４ａ及びｅ側端子２ｂとコ
イル１１とをそれぞれ導通接続し、中軸３とリード線４
とを接合して発熱体組立体７Ａを構成し、しかるのち、
該発熱体組立体７Ａを取付金具８の内腔に装入して金属
外筒５を取付金具８の先端内腔にろう付９によって固着
してなるものである。上記実施例における発熱体組立体
７Ａ、及び比較例として第２図に示す従来例における発
熱体組立体７を用いて金属外筒５を取付金具８の先端内
腔にろう付し、該ろう付９を行う前後における電気抵抗
の変化をそれぞれの試料１００個について調べた。(Embodiment) FIG. 1 is a longitudinal sectional view of an embodiment of the ceramic glow plug according to the present invention. In the same figure, the same parts as in FIG. A coiled end 4a of the lead wire 4 and a metal outer cylinder 5 are disposed on the outer periphery of the rear end.
Coil 11 so that it is adjacent to the rear end surface of the metal outer cylinder when the
The heater 1, which is surrounded by a ring, is inserted into the inner cavity of the metal outer cylinder 5 and placed at a predetermined position, and the coiled end 4a and the coil 11
and set silver solder in the inner cavity of the metal outer cylinder 5, respectively.
! Melt silver solder in a gas atmosphere furnace and braze to conductively connect the ■ side terminal 2a of the heating wire 2 to the lead wire 4a and the e side terminal 2b to the coil 11, respectively, and connect the center shaft 3 and the lead wire 4.
are joined to constitute the heating element assembly 7A, and then,
The heating element assembly 7A is inserted into the inner cavity of the fitting 8, and the metal outer cylinder 5 is fixed to the inner cavity at the distal end of the fitting 8 by brazing 9. Using the heating element assembly 7A in the above embodiment and the heating element assembly 7 in the conventional example shown in FIG. Changes in electrical resistance before and after carrying out step 9 were investigated for each of 100 samples.
その結果、従来例のものでは電気抵抗の変化が太きく
２０ｍΩ以上のものが８試料あったのに対し、実施例の
ものでは電気抵抗の変化は小さくすべて１０１１Ω以下
であった。上記の従来例の８試料及び実施例の比較的抵
抗の変化の大きな２０試料について解体して調べた結果
、従来例のものはいずれもｅ側端２ｂがはがれており、
実施例のものははがれは全く認められなかった。As a result, the change in electrical resistance is large in the conventional model.
There were 8 samples that were 20 mΩ or more, whereas in the examples, the change in electrical resistance was small and all were 10 11 Ω or less. As a result of disassembling and examining the 8 samples of the conventional example and the 20 samples of the example with relatively large resistance changes, it was found that the e-side end 2b of all of the conventional examples had peeled off.
No peeling was observed in the examples.
上記の如く比較例としての従来例のものについは全く導
通が失われるものはなかったが、電気抵抗の変化が大き
いことから発熱して導通が全くなくなるケースが起こり
得ることが考えられる。As mentioned above, there was no loss of conductivity in the conventional examples used as comparative examples, but since the change in electrical resistance is large, it is possible that there may be cases where heat is generated and conduction is completely lost.
（発明の効果）
本発明になるセラミックグロープラグは、発熱体組立体
の取付金具へのろう付に際して発熱線のｅ側端末が離脱
することがなく、導通が確保され安定した品質のものを
提供することができるとともに、歩留りが改善され生産
性が向上する効果がある。(Effects of the Invention) The ceramic glow plug of the present invention prevents the e-side end of the heating wire from coming off when brazing the heating element assembly to the mounting bracket, ensuring continuity and providing stable quality. This has the effect of improving yield and productivity.
、第１図は本発明によるセラミックグロープラグの実施
例の縦断面図、第２図は従来例のセラミックグロープラ
グの縦断面図である。
１：セラミックヒータ、２：発熱線、２ｂ：発熱線のθ
側端末、５：金属外筒、８：取付金具、１１：コイル。1 is a longitudinal sectional view of an embodiment of a ceramic glow plug according to the present invention, and FIG. 2 is a longitudinal sectional view of a conventional ceramic glow plug. 1: Ceramic heater, 2: Heat-generating wire, 2b: θ of heat-generating wire
Side terminal, 5: Metal outer cylinder, 8: Mounting bracket, 11: Coil.
Claims (1)
ヒータが金属外筒の先端面からヒータ部を突出してその
内腔にろう接され、該金属外筒が取付金具の先端内腔に
ろう接されてなるボデーアース型セラミックグロープラ
グにおいて、発熱線の■側端末が、金属外筒後端縁に隣
接してセラミックヒータ上に環装されたコイルを介して
金属外筒に電気的に接合されてなることを特徴とするセ
ラミックグロープラグ。A ceramic heater in which a heating wire is embedded in a ceramic sintered body has a heater portion protruding from the distal end surface of a metal outer cylinder and is brazed to the inner cavity of the metal outer cylinder, and the metal outer cylinder is brazed to the inner cavity of the distal end of a mounting bracket. In the body ground type ceramic glow plug, the terminal on the ■ side of the heating wire is electrically connected to the metal outer cylinder via a coil encircled on the ceramic heater adjacent to the rear edge of the metal outer cylinder. A ceramic glow plug that is characterized by
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62084636A JP2657646B2 (en) | 1987-04-08 | 1987-04-08 | Ceramic glow plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62084636A JP2657646B2 (en) | 1987-04-08 | 1987-04-08 | Ceramic glow plug |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63251724A true JPS63251724A (en) | 1988-10-19 |
| JP2657646B2 JP2657646B2 (en) | 1997-09-24 |
Family
ID=13836174
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62084636A Expired - Lifetime JP2657646B2 (en) | 1987-04-08 | 1987-04-08 | Ceramic glow plug |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2657646B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7560666B2 (en) | 2003-11-17 | 2009-07-14 | Denso Corporation | Glow plug and method of producing the same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6012063U (en) * | 1983-06-30 | 1985-01-26 | 自動車機器株式会社 | Glow plug for diesel engine |
| JPS60114631A (en) * | 1983-11-28 | 1985-06-21 | Ngk Spark Plug Co Ltd | Ceramic glow plug |
-
1987
- 1987-04-08 JP JP62084636A patent/JP2657646B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6012063U (en) * | 1983-06-30 | 1985-01-26 | 自動車機器株式会社 | Glow plug for diesel engine |
| JPS60114631A (en) * | 1983-11-28 | 1985-06-21 | Ngk Spark Plug Co Ltd | Ceramic glow plug |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7560666B2 (en) | 2003-11-17 | 2009-07-14 | Denso Corporation | Glow plug and method of producing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2657646B2 (en) | 1997-09-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| EXPY | Cancellation because of completion of term |