JPH04332313A - Junction structure of ceramic glow plug - Google Patents
Junction structure of ceramic glow plugInfo
- Publication number
- JPH04332313A JPH04332313A JP12466491A JP12466491A JPH04332313A JP H04332313 A JPH04332313 A JP H04332313A JP 12466491 A JP12466491 A JP 12466491A JP 12466491 A JP12466491 A JP 12466491A JP H04332313 A JPH04332313 A JP H04332313A
- Authority
- JP
- Japan
- Prior art keywords
- outer cylinder
- ceramic heater
- silver solder
- metal fittings
- ceramic
- 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 44
- 229910052751 metal Inorganic materials 0.000 claims abstract description 38
- 239000002184 metal Substances 0.000 claims abstract description 38
- 229910000679 solder Inorganic materials 0.000 claims abstract description 22
- 238000003466 welding Methods 0.000 claims abstract description 20
- 238000010894 electron beam technology Methods 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 abstract description 8
- 239000000853 adhesive Substances 0.000 abstract description 3
- 230000001070 adhesive effect Effects 0.000 abstract description 3
- 238000005304 joining Methods 0.000 description 6
- 238000005219 brazing Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 229910052575 non-oxide ceramic Inorganic materials 0.000 description 2
- 239000011225 non-oxide ceramic Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
Abstract
Description
【０００１】0001
【産業上の利用分野】この発明は、内燃機関、特にディ
ーゼル機関の始動時に使用されるグロープラグの、セラ
ミックヒーター体と金具の接合構造に関するものである
。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for joining a ceramic heater body and a metal fitting of a glow plug used for starting an internal combustion engine, particularly a diesel engine.
【０００２】0002
【従来の技術】近年、内燃機関、特にディーゼル機関の
始動時に使用されるグロープラグの、セラミックヒータ
ー体と金具の接合においては、金具内にセラミックヒー
ター体を挿入すると共に、上記セラミックヒーター体を
構成する外筒の表面に高温時にろう付け面が酸化してろ
う材の流動を損ねないようにするために、ろう付け面の
酸化を防止するフラックスを塗布し、更に、上記金具の
上端面に円周状に銀ろうを挿嵌して、高周波により銀ろ
うを溶融させて、この高周波により溶融した銀ろうを金
具と外筒の間に流入させ、密閉性を保持しつつ一体に接
合してなるものである。[Prior Art] In recent years, when joining a ceramic heater body and a metal fitting of a glow plug used when starting an internal combustion engine, especially a diesel engine, the ceramic heater body is inserted into the metal fitting and the ceramic heater body is constructed. In order to prevent the brazing surface from oxidizing at high temperatures and impairing the flow of the brazing material, a flux is applied to the surface of the outer cylinder to prevent oxidation of the brazing surface, and a circle is added to the upper end surface of the metal fitting. Silver solder is inserted around the circumference, the silver solder is melted by high frequency, and the molten silver solder is caused to flow between the metal fitting and the outer cylinder, and they are joined together while maintaining airtightness. It is something.
【０００３】0003
【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、高周波により銀ろうを溶融させて、
この高周波により溶融した銀ろうを金具と外筒の間に流
入させ、密閉性を保持しつつ一体に接合してなるセラミ
ックヒーター体の接合構造の場合、セラミックヒーター
体を構成する外筒と金具を銀ろうによって接合する際に
、この銀ろうを溶融させるために高周波を使用するので
、必要となる金具上端面の銀ろうばかりではなく、セラ
ミックヒーター体を構成する外筒自体も高温となるので
、この高温となった外筒の膨張により、セラミックヒー
ターを密閉性を維持すると共に、固持するために外筒と
の間に充填されている銀ろうが変形することから、上記
外筒との固着性が低下し、ディーゼル機関の燃焼室にお
ける気密性が損なわれるため、金具と外筒を接合する作
業にあたっては、厳格な温度管理が必要となる欠点があ
る。[Problems to be Solved by the Invention] However, in the above conventional method, silver solder is melted by high frequency.
In the case of a ceramic heater body joint structure in which silver solder melted by this high frequency flows between the metal fitting and the outer cylinder and they are joined together while maintaining airtightness, the outer cylinder and the metal fitting that make up the ceramic heater body are connected. When joining with silver solder, high frequencies are used to melt the silver solder, so not only the silver solder on the upper end of the metal fitting, but also the outer cylinder itself that makes up the ceramic heater body, becomes high temperature. Due to the expansion of the outer cylinder at this high temperature, the silver solder filled between the outer cylinder and the outer cylinder to maintain the sealing property and secure the ceramic heater is deformed, so that the adhesiveness with the outer cylinder is improved. This has the disadvantage that strict temperature control is required when joining the metal fittings and the outer cylinder because the airtightness in the combustion chamber of the diesel engine is impaired.
【０００４】また、高周波によって溶融する銀ろうの流
動性を確保するために、セラミックヒーター体を構成す
る外筒の外周面や金具の内周面にろう付け面の酸化防止
を目的とするフラックスの塗布、さらに上記外筒と金具
とを接合する銀ローを、外筒と金具との間に挿入する作
業等は、手作業によって行なう必要があることから、作
業工程の増加につながり、セラミックグロープラグ製造
にあたっての作業性の低下につながるものである。[0004] In addition, in order to ensure the fluidity of the silver solder melted by high frequency, flux is applied to the outer peripheral surface of the outer cylinder and the inner peripheral surface of the metal fittings constituting the ceramic heater body to prevent oxidation of the brazing surface. The work of coating and inserting the silver solder between the outer cylinder and the metal fittings, which joins the outer cylinder and the metal fittings, must be done manually, leading to an increase in the number of work steps. This leads to a decrease in workability during manufacturing.
【０００５】そこで、この発明は上記従来のものの持つ
欠点を改善するものであり、セラミックヒーター体を構
成し、セラミックヒーターを固持する外筒と金具との接
合を簡単に、しかも確実に行えるようにしてなるもので
ある。[0005] Therefore, the present invention aims to improve the above-mentioned drawbacks of the conventional ones, and makes it possible to easily and reliably join the outer cylinder and the metal fittings that constitute the ceramic heater body and hold the ceramic heater in place. This is what happens.
【０００６】[0006]
【課題を解決するための手段】そのために、セラミック
ヒーターを銀ろうと共に固持する外筒と金具とを、電子
ビーム溶接又はレーザー溶接によって局部的に加熱し、
一体に接合してなるものである。[Means for solving the problem] To this end, the outer cylinder and metal fittings that hold the ceramic heater together with silver solder are locally heated by electron beam welding or laser welding,
It is made by joining them together.
【０００７】[0007]
【作用】以上の構成を具えるので、セラミックヒーター
体を構成する外筒と金具とを、電子ビーム溶接又はレー
ザー溶接によって加熱することにより、溶接に必要な部
分だけを局部的に加熱、接合することができることとな
り、高周波によるものとは異なり外筒全体を加熱するこ
とがなくなるので、外筒の熱膨張も最小限のものとする
ことが可能となり、セラミックヒーターと外筒の間に充
填される銀ろうの変形を最小限にすることができ、セラ
ミックヒーターと外筒の固着力の低下を損ねることなく
、気密性自体も十分に確保し得るものである。[Operation] With the above configuration, by heating the outer cylinder and metal fittings that make up the ceramic heater body by electron beam welding or laser welding, only the parts necessary for welding can be locally heated and joined. Unlike high frequency heating, the entire outer cylinder is not heated, so the thermal expansion of the outer cylinder can be minimized, and the ceramic heater is filled between the ceramic heater and the outer cylinder. Deformation of the silver solder can be minimized, and sufficient airtightness can be ensured without impairing the adhesive force between the ceramic heater and the outer cylinder.
【０００８】[0008]
【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セラミックグロ
ープラグであり、このセラミックグロープラグ（１）は
、一端を端子（３）とすると共に、この端子（３）を、
リードコイル（５）によって、充填した銀ろう（７）を
介して金属製の外筒（６）により固持されるセラミック
ヒーター（４）と一体に構成してなるセラミックヒータ
ー体（２）と、ディーゼル機関への取付にあたって使用
されるネジ部（９）を有する金具（８）から構成される
ものである。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be further explained with reference to embodiments shown in the drawings. (1) is a ceramic glow plug which is an embodiment of the present invention, and this ceramic glow plug (1) has one end as a terminal (3), and this terminal (3) is
A ceramic heater body (2) formed integrally with a ceramic heater (4) fixed by a metal outer cylinder (6) via a filled silver solder (7) by a lead coil (5), and a diesel It is composed of a metal fitting (8) having a threaded part (9) used for installation on the engine.
【０００９】そして、セラミックヒーター（４）を銀ろ
う（７）と共に固持する外筒（６）と金具（８）とを、
図２に示すように、電子ビーム溶接又はレーザー溶接に
よって、局部的に加熱することにより、外筒（６）の周
囲に溶接部（１２）を設けながら、一体に接合してなる
ものである。[0009] Then, the outer cylinder (6) and metal fittings (8) that hold the ceramic heater (4) together with the silver solder (7) are
As shown in FIG. 2, by locally heating the outer cylinder (6) by electron beam welding or laser welding, a welded part (12) is provided around the outer cylinder (6) and the outer cylinder (6) is integrally joined.
【００１０】この発明が以上の構成を具えるので、セラ
ミックヒーター体（２）を構成する外筒（６）と金具（
８）とを、電子ビーム溶接又はレーザー溶接によって金
具（８）の上面部（１０）のみを加熱することにより、
溶接に必要な部分だけを局部的に加熱、接合することが
できることとなり、高周波によるものとは異なり外筒（
６）全体を加熱することがなくなるので、外筒（６）の
熱膨張も最小限のものとすることが可能となり、セラミ
ックヒーター（４）と外筒（６）の間に充填される銀ろ
う（７）の変形を最小限のものとすることができことと
なり、セラミックヒーター（４）と外筒（６）の固着力
の低下を損ねることなく、気密性自体も十分に確保しつ
つ、外筒（６）と金具（８）の一体的な接合を得ること
ができるものである。[0010] Since the present invention has the above configuration, the outer cylinder (6) and the metal fittings (6) constituting the ceramic heater body (2)
8) by heating only the upper surface part (10) of the metal fitting (8) by electron beam welding or laser welding,
This means that only the parts necessary for welding can be locally heated and joined, and unlike methods using high frequency, the outer cylinder (
6) Since the entire body is not heated, the thermal expansion of the outer cylinder (6) can be minimized, and the silver solder filled between the ceramic heater (4) and the outer cylinder (6) The deformation of (7) can be minimized, and the adhesive strength between the ceramic heater (4) and the outer cylinder (6) will not be reduced, and the airtightness itself will be sufficiently ensured. It is possible to obtain an integral connection between the tube (6) and the metal fitting (8).
【００１１】また、図３に示すように、金具（８）の先
端を異なる金属からなるものとする場合には、金具先端
部（１１）を銀ろう（７）によってセラミックヒーター
体（２）を構成する外筒（６）の表面に接合させると共
に、その金具先端部（１１）と金具（８）との接合をも
含めて、その側周に溶接部（１２）を周設しつつ、電子
ビーム溶接又はレーザー溶接によって金具（８）の溶接
と共に一体にすることとしたものである。Further, as shown in FIG. 3, when the tip of the metal fitting (8) is made of a different metal, the tip of the metal fitting (11) is connected to the ceramic heater body (2) using silver solder (7). In addition to being joined to the surface of the outer cylinder (6), a welded part (12) is provided around the side of the metal fitting (11) and the metal fitting (8), including the connection between the metal fitting tip (11) and the metal fitting (8). The metal fittings (8) are welded and integrated by beam welding or laser welding.
【００１２】なお、セラミックヒーター（４）は図２に
示すように、窒化珪素等の非酸化物系セラミック内部に
タングステン又はタングステンを主体とする合金等から
なる高融点金属線を埋設して一体に焼結したもの、又は
導電性セラミックの発熱体を非酸化物系セラミックに埋
設して焼結したもの、更には導電性セラミックの発熱体
の一端をセラミックに保持するようにして構成されたセ
ラミックヒーター等であってもよい。As shown in FIG. 2, the ceramic heater (4) is made by embedding a high melting point metal wire made of tungsten or a tungsten-based alloy inside a non-oxide ceramic such as silicon nitride. Ceramic heaters made by sintering, or by sintering a conductive ceramic heating element embedded in non-oxide ceramic, or by holding one end of the conductive ceramic heating element in the ceramic. etc. may be used.
【００１３】[0013]
【発明の効果】以上のとおり、セラミックヒーター体を
構成する外筒を金具に対して、電子ビーム溶接又はレー
ザー溶接によって局部的に加熱し、一体に接合すること
により、セラミックヒーターを外筒に固持するために必
要である銀ろうに対して、溶接時の熱による外筒の熱膨
張によって発生する銀ろうの変形を防ぐことができるの
で、セラミックヒーターの外筒に対する固着力を低下さ
せることなく、金具内の気密性を確実に維持することが
できる優れた効果を有するものである。[Effects of the Invention] As described above, by locally heating the outer cylinder constituting the ceramic heater body to the metal fitting by electron beam welding or laser welding and joining them together, the ceramic heater is fixed to the outer cylinder. It is possible to prevent the deformation of the silver solder which is necessary for the purpose of the ceramic heater due to the thermal expansion of the outer cylinder due to the heat during welding, without reducing the adhesion force to the outer cylinder of the ceramic heater. This has an excellent effect of reliably maintaining airtightness within the fitting.
【図１】この発明の実施例であるセラミックグロープラ
グの部分断面図である。FIG. 1 is a partial cross-sectional view of a ceramic glow plug that is an embodiment of the present invention.
【図２】この発明の実施例の要部拡大断面図である。FIG. 2 is an enlarged sectional view of a main part of an embodiment of the present invention.
【図３】この発明のその他の実施例における要部拡大断
面図である。FIG. 3 is an enlarged sectional view of a main part in another embodiment of the invention.
１ セラミックグロープラグ ２ セラミックヒーター体 ３ 端子 ４ セラミックヒーター ５ リードコイル ６ 外筒 ７ 銀ろう ８ 金具 ９ ネジ部 １０ 上面部 １１ 金具先端部 １２ 溶接部 1 Ceramic glow plug 2 Ceramic heater body 3 Terminal 4 Ceramic heater 5 Lead coil 6 Outer cylinder 7 Silver wax 8 Metal fittings 9 Threaded part 10 Top part 11 Tip of metal fittings 12 Welded part
Claims (1)
持する外筒と金具とを、電子ビーム溶接又はレーザー溶
接によって局部的に加熱し、一体に接合してなるセラミ
ックグロープラグの接合構造。1. A ceramic glow plug joint structure in which an outer cylinder and a metal fitting that hold a ceramic heater together with silver solder are locally heated by electron beam welding or laser welding and joined together.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3124664A JP3028125B2 (en) | 1991-04-30 | 1991-04-30 | Ceramic glow plug joining structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3124664A JP3028125B2 (en) | 1991-04-30 | 1991-04-30 | Ceramic glow plug joining structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04332313A true JPH04332313A (en) | 1992-11-19 |
| JP3028125B2 JP3028125B2 (en) | 2000-04-04 |
Family
ID=14891002
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3124664A Expired - Fee Related JP3028125B2 (en) | 1991-04-30 | 1991-04-30 | Ceramic glow plug joining structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3028125B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6727473B2 (en) * | 2001-03-09 | 2004-04-27 | Ngk Spark Plug Co., Ltd. | Ceramic heater device and method for manufacturing the device |
| EP1747406A1 (en) | 2004-04-27 | 2007-01-31 | Siemens VDO Automotive S.A.S. | Glow plug provided with a pressure sensor |
-
1991
- 1991-04-30 JP JP3124664A patent/JP3028125B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6727473B2 (en) * | 2001-03-09 | 2004-04-27 | Ngk Spark Plug Co., Ltd. | Ceramic heater device and method for manufacturing the device |
| EP1747406A1 (en) | 2004-04-27 | 2007-01-31 | Siemens VDO Automotive S.A.S. | Glow plug provided with a pressure sensor |
| US7825352B2 (en) | 2004-04-27 | 2010-11-02 | Continental Automotive France | Glow plug provided with a pressure sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3028125B2 (en) | 2000-04-04 |
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