JP2847565B2 - Sheath type glow plug and method of manufacturing the same - Google Patents
Sheath type glow plug and method of manufacturing the sameInfo
- Publication number
- JP2847565B2 JP2847565B2 JP11259090A JP11259090A JP2847565B2 JP 2847565 B2 JP2847565 B2 JP 2847565B2 JP 11259090 A JP11259090 A JP 11259090A JP 11259090 A JP11259090 A JP 11259090A JP 2847565 B2 JP2847565 B2 JP 2847565B2
- Authority
- JP
- Japan
- Prior art keywords
- metal tube
- mounting bracket
- distal end
- diameter
- glow plug
- 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 - Fee Related
Links
Landscapes
- Resistance Heating (AREA)
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用いられる
シーズ型グロープラグ及びその製造方法に関するもので
ある。Description: TECHNICAL FIELD The present invention relates to a sheath type glow plug mainly used for a diesel engine and a method for manufacturing the same.
従来のシーズ型グロープラグは第４図に示す如く、Fe
−Cr、Ni−Cr、あるいはNi等の金属線からなる発熱線１
を、マグネシア、アルミナ等の耐熱絶縁性充填物２と共
に、一端閉塞した金属管３内に収納し、発熱線１の一端
を金属管３の内腔底部に溶接し、他端を中軸４に接合し
て組立体５を構成し、金属管３を絞り加工して所定の外
径に縮径するとともに、充填物２の充填密度を高くして
図示したような組立体５が形成される。金属管３及び組
立体５の符号は絞り加工前後とも同一符号を用いた。こ
のような組立体５を金属管３が突出するように取付金具
６の内腔とがろう接７により気密に接合される。この
際、金属管３の外径は取付金具６の先端部内腔の内径よ
りも0.02〜0.2mm小さくしてあり、これは両者の間の隙
間にろうを流し込むために必要な隙間である。なお、８
は取付金具６の後端側での中軸４を気密に保持するシー
ル材である。As shown in FIG.
Heating wire 1 made of metal wire such as -Cr, Ni-Cr or Ni
Is housed in a metal tube 3 closed at one end together with a heat-resistant insulating filler 2 such as magnesia, alumina, etc., one end of the heating wire 1 is welded to the bottom of the inner cavity of the metal tube 3, and the other end is joined to the center shaft 4. As a result, the metal pipe 3 is drawn and reduced to a predetermined outer diameter, and the packing density of the filler 2 is increased to form the assembly 5 as shown in the figure. The same reference numerals are used for the metal tube 3 and the assembly 5 before and after drawing. Such an assembly 5 is hermetically joined to the inner cavity of the mounting bracket 6 by brazing 7 so that the metal tube 3 protrudes. At this time, the outer diameter of the metal tube 3 is smaller by 0.02 to 0.2 mm than the inner diameter of the inner cavity of the distal end of the mounting bracket 6, which is a gap necessary for pouring the wax into the gap between them. In addition, 8
Is a sealing material for holding the center shaft 4 airtight at the rear end side of the mounting bracket 6.
前記したように、組立体５を取付金具６の内腔に挿入
して、金属管３を取付金具６の内腔にろう接する際に、
組立体５は先端側が金属管３であり加熱されて高温にな
るので、後端側においてのみ中軸４を位置ストッパにて
固定する。従って、第５図に示すように組立体５が取付
金具６の内腔の先端部で偏心したまま、ろう接されるこ
とがあり偏心したものをエンジンに取付け使用すると燃
料が発熱する金属管にうまく当たらずエンジン始動性の
悪化を招くことになる。また、中軸４を位置ストッパに
て固定するため組立体５の全長ばらつきがそのまま金属
管３の取付金具６の先端から突出する露出長の不揃いの
原因となり、同様にエンジン始動性能を悪化させる原因
となる。As described above, when the assembly 5 is inserted into the lumen of the mounting bracket 6 and the metal tube 3 is brazed to the lumen of the mounting bracket 6,
The front end of the assembly 5 is the metal tube 3 and is heated to a high temperature. Therefore, the center shaft 4 is fixed by the position stopper only at the rear end. Therefore, as shown in FIG. 5, the assembly 5 may be eccentric at the distal end of the bore of the mounting bracket 6 and may be brazed. Failure to do so will result in worse engine startability. In addition, since the center shaft 4 is fixed by the position stopper, the variation in the total length of the assembly 5 causes the unevenness of the exposed length protruding from the tip of the mounting bracket 6 of the metal tube 3 as it is, and also causes the deterioration of the engine starting performance. Become.
本発明は、上記の如き課題を解決するためになされた
ものであり、第１の発明は金属管を、その後端側基部に
対して先端側を径小に形成して段付形状とし、取付金具
の先端部内腔と金属管の先端側の径小部とがろう接され
たシーズ型グロープラグとするものである。SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and a first invention is to form a metal tube into a stepped shape by forming a distal end side with a small diameter with respect to a rear end side base portion, and mounting the metal tube. A sheath-type glow plug in which a lumen at the distal end of the metal fitting and a small-diameter portion on the distal end side of the metal tube are brazed.
第２の発明は、第１の発明における金属管の後端側基
部の外径を、この金属管が、ろう接される取付金具内腔
の内径よりも0.01〜0.05mm小さくしたシーズ型グロープ
ラグとするものである。A second invention provides a sheath-type glow plug in which the outer diameter of the rear end side base of the metal tube in the first invention is smaller by 0.01 to 0.05 mm than the inner diameter of a mounting bracket to which the metal tube is brazed. It is assumed that.
第３の発明は、第１の発明における金属管を、取付金
具内腔に挿嵌される前では、後端側基部の外径が、これ
がろう接される取付金具内腔の内径よりも大きくなるよ
うに形成しておき、この金属管を先端側の径小部の一部
を突出するように取付金具の内腔に圧入してのち、取付
金具の先端部内腔と金属管の前記先端側の径小部とをろ
う接するという製造方法を提供するものである。なお、
後端側基部の外径が、これがろう接される取付金具内腔
の内径よりも0.01〜0.05mm大きくなるように形成すると
よい。According to a third aspect of the present invention, before the metal tube according to the first aspect is inserted into the inner space of the fitting, the outer diameter of the rear end side base is larger than the inner diameter of the inner space of the fitting to which the metal tube is brazed. The metal tube is press-fitted into the lumen of the fitting so as to protrude a part of the small-diameter portion on the tip side, and then the lumen of the tip portion of the fitting and the tip side of the metal tube. The present invention provides a manufacturing method of brazing a small diameter portion to a solder. In addition,
The rear end base may be formed so that the outer diameter thereof is larger by 0.01 to 0.05 mm than the inner diameter of the mounting bracket bore to which the rear end is brazed.
第１の発明においては、金属管の外径と、これがろう
接される取付金具の内径との間の隙間を極力少なくすれ
ば、前記に述べたように組立体が取付金具内腔で斜行す
るのを防止することができる。しかし、上記隙間があま
り小さすぎると金属管と取付金具の内腔との間への、ろ
うの流れが悪くなるために接合が不十分となる。そのた
めに金属管の後端側基部においてのみ隙間を極力小さく
し、先端側を細径にすることによって、この部分の隙間
が大きくなりろう接が十分に行うことができる。In the first aspect of the present invention, if the gap between the outer diameter of the metal pipe and the inner diameter of the mounting bracket to which the metal pipe is brazed is reduced as much as possible, as described above, the assembly is skewed in the mounting lumen. Can be prevented. However, if the gap is too small, the flow of the wax between the metal tube and the bore of the mounting bracket will be poor, resulting in insufficient bonding. Therefore, by making the gap as small as possible only at the rear end side base portion of the metal tube and making the front end side small diameter, the gap at this portion becomes large and brazing can be sufficiently performed.
第２の発明においては、上記の隙間を極力小さくする
ために、金属管と取付金具内径との径差を0.01mm未満と
すると、金属管の挿入が困難となり、また、0.05mmを超
えると、金属管が斜行して好ましくない偏心を発生す
る。そのために径差を0.01〜0.05mmとするものであり、
所要の特性を有するグロープラグを製造することができ
る。In the second invention, in order to minimize the gap, if the diameter difference between the metal pipe and the inner diameter of the mounting bracket is less than 0.01 mm, it becomes difficult to insert the metal pipe, and if it exceeds 0.05 mm, The metal tube skews and produces undesirable eccentricity. Therefore, the diameter difference is set to 0.01 to 0.05 mm,
A glow plug having required characteristics can be manufactured.
第３の発明においては、更に改善するために、取付金
具内腔に挿嵌する前の金属管の後端側基部の外径を、こ
れがろう接される取付金具内径の内径よりも大きくする
ことによって、これを取付金具内腔に圧入すれば、金属
管の後端側基部が取付金具内腔に密着するので、斜行す
ることがなくなる。また、圧入は金属管の先端をストッ
パに当て行うことができるので、組立体の全長如何にか
かわらず露出長を直接得ることができ、露出長の不揃い
をへらすことができる。なお、上記の如く寸法を設定し
たとしても、ばらつきが全くないとも言えないし、ま
た、取付真具内径にもばらつきがあり得るので、金属管
の後端側基部の外径を、これがろう接される取付金具内
腔の内径よりも0.01〜0.05mm大きくするとよい。これら
の径差が0mm以下になることを避けるために0.01mm以上
としたものであり、また、0.05mmを超えると圧入により
金属管の変形を起こすおそれがあるので、上記の如く0.
01〜0.05mmとするものである。In the third invention, for further improvement, the outer diameter of the rear end side base portion of the metal tube before being inserted into the inner space of the mounting bracket is made larger than the inner diameter of the inner diameter of the mounting bracket to which the metal tube is brazed. Accordingly, if this is press-fitted into the interior of the mounting bracket, the rear end side base of the metal tube is in close contact with the interior of the mounting bracket, so that there is no skew. Further, since the press-fitting can be performed by contacting the tip of the metal tube to the stopper, the exposed length can be directly obtained regardless of the total length of the assembly, and unevenness of the exposed length can be reduced. Even if the dimensions are set as described above, it can not be said that there is no variation at all, and there may be variation in the inner diameter of the mounting bracket. The inner diameter of the mounting bracket is preferably 0.01 to 0.05 mm larger than the inner diameter of the mounting bracket. These diameter differences are set to 0.01 mm or more in order to avoid being 0 mm or less, and if it exceeds 0.05 mm, the metal pipe may be deformed by press-fitting.
It should be 01-0.05 mm.
第１図は本発明によるシーズ型グロープラグの実施例
の縦断面図であり、第２図は第１図における組立体5Aの
正面図である。これらの図において、3Aは先端が閉塞し
た金属管であり、その内部構造は図示を省略したが、従
来例の第４図における金属管３と同様に発熱線が耐熱絶
縁性充填物を介して内蔵されている。金属管3Aの後端側
基部3A−１に対して先端側3A−２は細径に形成されて段
付形状に構成されている。このように発熱線を内蔵した
金属管3Aと中軸４とにより組立体5Aが構成され、該組立
体5Aが取付金具６の内腔に挿嵌され、金属管3Aの細径の
先端側3A−２の部分で、ろう接７により気密に接合され
ている。なお、従来例の第４図と同一部分は同一符号に
て示した。また、後端側基部3A−１と先端側3A−２との
径差は理解しやすいように誇張して図示してある。FIG. 1 is a longitudinal sectional view of an embodiment of a sheath type glow plug according to the present invention, and FIG. 2 is a front view of an assembly 5A in FIG. In these figures, reference numeral 3A denotes a metal tube having a closed end, and its internal structure is not shown. However, like the metal tube 3 in FIG. 4 of the conventional example, a heating wire is provided via a heat-resistant insulating filler. Built-in. The distal end 3A-2 is formed to have a small diameter with respect to the rear end base 3A-1 of the metal tube 3A and has a stepped shape. An assembly 5A is constituted by the metal tube 3A containing the heating wire and the center shaft 4 as described above. The assembly 5A is inserted into the inner cavity of the mounting bracket 6, and the small-diameter distal end 3A- of the metal tube 3A is inserted. At the portion 2, the airtight connection is made by the brazing 7. The same parts as in FIG. 4 of the conventional example are denoted by the same reference numerals. Further, the diameter difference between the rear end side base 3A-1 and the front end side 3A-2 is exaggerated for easy understanding.
金属管3Aが挿嵌される取付金具６の内腔の内径が5.20
mmなる取付金具６を用い、これに対して、金属管3Aの後
端側基部3A−１の外径を5.15mm、先端側3A−２の外径を
5.0mmとした。従って、取付金具６の内腔と金属管3Aの
後端側基部3A−１の外径との差は0.05mmであり、取付金
具６の内腔と金属管3Aの先端側3A−２の外径との差は0.
2mmとなる。このように形成された組立体5Aを取付金具
６の内腔に挿嵌して金属管3Aの先端部が所定の長さに突
出するよう位置させて、金属管3Aを先端側3A−２の部分
で、ろう接７により取付金具６の内腔に気密に接合し
た。このようにすれば金属管3Aが偏心することもなく接
合が可能であった。なお、金属管3Aの後端側基部3A−１
の長さｌは少なくとも5mm以上あれば十分である。The inner diameter of the lumen of the mounting bracket 6 into which the metal tube 3A is inserted is 5.20.
The outer diameter of the rear end base 3A-1 of the metal tube 3A is 5.15 mm, and the outer diameter of the front end 3A-2 is 5 mm.
5.0 mm. Therefore, the difference between the inner diameter of the mounting bracket 6 and the outer diameter of the rear end base 3A-1 of the metal tube 3A is 0.05 mm, and the difference between the inner lumen of the mounting bracket 6 and the front end 3A-2 of the metal tube 3A. The difference from the diameter is 0.
2 mm. The assembly 5A thus formed is inserted into the lumen of the fitting 6 so that the distal end of the metal tube 3A projects to a predetermined length, and the metal tube 3A is inserted into the distal end 3A-2. At the portion, the airtight connection was made to the inner space of the mounting bracket 6 by brazing 7. In this way, joining was possible without eccentricity of the metal tube 3A. In addition, the rear end side base 3A-1 of the metal tube 3A.
It is sufficient that the length l is at least 5 mm or more.
次に、上記と同様寸法の組立体5Aを用い、更に取付金
具６の内径が5.12mmのものを用意した。この場合、金属
管3Aの後端側基部3A−１の外径が5.15mmであり、取付金
具６の内径よりも大きいので、取付金具６の内腔に金属
管3Aをそのまま挿入することはできない。従って、第３
図（イ）に示す如く、金型９及びガイド10にて取付金具
６及び組立体5Aを支えて矢印方向に取付金具６を押圧し
て金属管3Aを取付金具６の内腔に圧入してのち、第３図
（ロ）に示す如く支持台11に載せて、金属管3Aと取付金
具６との間の隙間に、ろうを流し込んでろう接する。12
はろう材、13はガスバーナである。この場合、第２図で
示す金属管3Aの後端側基部3A−１の長さｌは少なくとも
1mm以上あればよい。その後、従来例同様、取付金具６
の後端開口部内にガラス封着８を施して第１図に示すグ
ロープラグを得る。Next, an assembly 5A having the same dimensions as above and an inner diameter of the mounting bracket 6 of 5.12 mm was prepared. In this case, since the outer diameter of the rear end side base portion 3A-1 of the metal tube 3A is 5.15 mm, which is larger than the inner diameter of the mounting member 6, the metal tube 3A cannot be directly inserted into the inner cavity of the mounting member 6. . Therefore, the third
As shown in FIG. 1A, the metal fitting 3 and the assembly 5A are supported by the mold 9 and the guide 10, and the metal fitting 3A is pressed in the direction of the arrow to press the metal tube 3A into the inner cavity of the metal fitting 6. Thereafter, as shown in FIG. 3 (b), it is placed on the support base 11 and the brazing is poured into the gap between the metal tube 3A and the mounting bracket 6 to be brazed. 12
Is a brazing material, and 13 is a gas burner. In this case, the length 1 of the rear end base 3A-1 of the metal tube 3A shown in FIG.
1 mm or more is sufficient. Then, as in the conventional example, the mounting bracket 6 is used.
A glass seal 8 is applied to the inside of the rear end opening to obtain the glow plug shown in FIG.
なお、金属管3Aの段付形状加工は、絞り加工時に、NC
スウェージングマシン等を使用すれば容易である。The stepped shape processing of the metal tube 3A is performed by NC during drawing.
It is easy if a swaging machine or the like is used.
上記の如き製造方法によれば、金属管の偏心が従来は
0.4〜1.0mmあったものが、0.5mm以下に減少し、また、
露出長が従来は±0.8mm程度のばらつきがあったのに対
し、±0.4mm以下に減少した。According to the manufacturing method as described above, the eccentricity of the metal tube has conventionally been
What was 0.4-1.0mm, reduced to 0.5mm or less,
The exposure length has been reduced to ± 0.4 mm or less, while it has been about ± 0.8 mm in the past.
本発明のシーズ型グロープラグの構造及び製造方法に
よれば、金属管を取付金具内腔に、ろう接する際に、金
属管が偏心したり、あるいは露出長がばらついたりせ
ず、また、ろう接を十分に行うことができるため気密性
の確保もできるので、性能のばらつきのないグロープラ
グを提供することができる。ADVANTAGE OF THE INVENTION According to the structure and manufacturing method of the sheathed-type glow plug of this invention, when a metal tube is brazed to the inside of a mounting bracket, the metal tube does not become eccentric or the exposed length does not vary. Therefore, airtightness can be ensured, so that a glow plug with no variation in performance can be provided.
第１図は本発明によるシーズ型グロープラグの実施例の
縦断面図、第２図は本発明によるシーズ型グロープラグ
に用いられる組立体の正面図、第３図は本発明によるシ
ーズ型グロープラグの製造方法を説明するための断面
図、第４図は従来のシーズ型グロープラグの縦断面図、
第５図は従来のシーズ型グロープラグの製造時における
組立体が斜行している例を示す断面図である。 1:発熱体、２……耐熱絶縁性充填物、3,3A:金属管、3A
−1:金属管の後端側基部、3A−2:金属管の先端側、4:中
軸、5,5A:組立体、7:ろう接。FIG. 1 is a longitudinal sectional view of an embodiment of a sheath type glow plug according to the present invention, FIG. 2 is a front view of an assembly used for the sheath type glow plug according to the present invention, and FIG. FIG. 4 is a longitudinal sectional view of a conventional seeds-type glow plug.
FIG. 5 is a cross-sectional view showing an example in which the assembly is skewed at the time of manufacturing the conventional seeds-type glow plug. 1: Heating element, 2 ... Heat-resistant insulating filler, 3, 3A: Metal tube, 3A
-1: rear end side base of the metal tube, 3A-2: front end side of the metal tube, 4: center shaft, 5.5A: assembly, 7: brazing.
Claims (3)
物を介して発熱線が収納され、前記発熱線の一端は前記
金属管内腔底部に接合されるとともに他端は中軸に接合
され、後端側基部外径に比して先端側を径小に形成して
段付形状に構成された前記金属管が前記先端側の径小部
の一部を突出して取付金具の先端部内腔に配置され、前
記取付金具の先端部内腔と前記金属管の前記先端側の径
小部とがろう接されてなることを特徴とするシーズ型グ
ロープラグ。A heating wire is housed in a metal tube having a closed end via a heat-resistant insulating filler, one end of the heating wire is joined to the bottom of the lumen of the metal tube, and the other end is joined to a center shaft, The metal tube, which is formed in a stepped shape by forming the distal end to be smaller in diameter than the rear end base outer diameter, projects a part of the small diameter portion on the distal end side into the distal end cavity of the mounting bracket. A sheath-type glow plug, wherein the inner cavity of the distal end portion of the mounting bracket and the small-diameter portion on the distal end side of the metal tube are soldered to each other.
部内腔の内径よりも0.01〜0.05mm小さく形成されてなる
ことを特徴とする請求項１記載のシーズ型グロープラ
グ。2. The sheath-type glow plug according to claim 1, wherein an outer diameter of a rear end side base portion of the metal tube is formed to be smaller by 0.01 to 0.05 mm than an inner diameter of a bore of a front end of the mounting bracket.
造方法であって、前記金属管の前記後端側基部の外径を
前記取付金具の先端部内腔の内径よりも大きく形成し、
前記金属管を前記先端側の径小部の一部を突出するよう
に圧入してのち、前記取付金具の先端部内腔と前記金属
管の先端側の径小部とをろう接により接合することを特
徴とするシーズ型グロープラグの製造方法。3. The method for manufacturing a sheath type glow plug according to claim 1, wherein an outer diameter of the rear end side base of the metal tube is formed larger than an inner diameter of a front end cavity of the mounting bracket.
After press-fitting the metal tube so as to protrude a part of the small-diameter portion on the distal end side, brazing the lumen of the distal end portion of the mounting bracket to the small-diameter portion on the distal end side of the metal tube by brazing. A method for manufacturing a seeds-type glow plug, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11259090A JP2847565B2 (en) | 1990-04-27 | 1990-04-27 | Sheath type glow plug and method of manufacturing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11259090A JP2847565B2 (en) | 1990-04-27 | 1990-04-27 | Sheath type glow plug and method of manufacturing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH049517A JPH049517A (en) | 1992-01-14 |
| JP2847565B2 true JP2847565B2 (en) | 1999-01-20 |
Family
ID=14590551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11259090A Expired - Fee Related JP2847565B2 (en) | 1990-04-27 | 1990-04-27 | Sheath type glow plug and method of manufacturing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2847565B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19752920A1 (en) * | 1997-11-28 | 1999-06-02 | Bosch Gmbh Robert | Glow plug |
| US6215105B1 (en) * | 1999-08-18 | 2001-04-10 | Delphi Technologies, Inc. | Ion sensor glow plug assembly with coating between sheath and shell |
| US6285007B1 (en) * | 1999-08-18 | 2001-09-04 | Delphi Technologies, Inc. | Ion sensor glow plug assembly |
| US6248980B1 (en) * | 1999-08-19 | 2001-06-19 | Delphi Technologies, Inc. | Ion sensor glow plug assembly |
| JP4632565B2 (en) † | 2001-03-09 | 2011-02-16 | 日本特殊陶業株式会社 | Ceramic heater device and manufacturing method thereof |
| JP5074534B2 (en) * | 2010-01-11 | 2012-11-14 | 日本特殊陶業株式会社 | Ceramic heater device |
-
1990
- 1990-04-27 JP JP11259090A patent/JP2847565B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH049517A (en) | 1992-01-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |