JPH0313486B2 - - Google Patents
Info
- Publication number
- JPH0313486B2 JPH0313486B2 JP21886186A JP21886186A JPH0313486B2 JP H0313486 B2 JPH0313486 B2 JP H0313486B2 JP 21886186 A JP21886186 A JP 21886186A JP 21886186 A JP21886186 A JP 21886186A JP H0313486 B2 JPH0313486 B2 JP H0313486B2
- Authority
- JP
- Japan
- Prior art keywords
- coil
- heating element
- resistor
- glow plug
- 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.)
- Expired
Links
- 238000010438 heat treatment Methods 0.000 claims description 18
- 239000000919 ceramic Substances 0.000 claims description 17
- 239000000463 material Substances 0.000 description 7
- 238000005219 brazing Methods 0.000 description 5
- 238000003466 welding Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000006866 deterioration Effects 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
Landscapes
- Ignition Installations For Internal Combustion Engines (AREA)
Description
【発明の詳細な説明】
産業上の利用分野：
本発明はデイーゼル機関の副燃焼室に装着され
始動時に該副燃焼室を予熱するために使用される
急速加熱型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 rapid heating type glow plug that is installed in a sub-combustion chamber of a diesel engine and is used to preheat the sub-combustion chamber during startup.
従来の技術：
一般にデイーゼル機関は低温時における始動性
が悪いためシリンダー内又は副燃焼室内にグロー
プラグを装着し、室内の温度を上昇させて機関の
始動特性を向上させる方法が行われおり、始動時
において急速な昇温特性を持つことが要求され
る。Conventional technology: Diesel engines generally have poor starting performance at low temperatures, so a glow plug is installed inside the cylinder or sub-combustion chamber to raise the temperature inside the engine and improve the starting characteristics of the engine. At times, it is required to have rapid temperature rise characteristics.
急速加熱型グロープラグとしては第３図に示す
ようにセラミツク発熱体に電流制御用の抵抗体を
直列に接続した構造の自己制御型グロープラグが
特開昭59−157423号公報に開示されている。第３
図において１は取付金具２はセラミツク発熱体３
は外筒４は抵抗体用コイル１１は発熱線１２，１
３はいずれも鑞付け接合部、１４は充填粉末を示
す。 As a rapid heating type glow plug, a self-control type glow plug having a structure in which a resistor for current control is connected in series to a ceramic heating element is disclosed in Japanese Patent Application Laid-open No. 157423/1983, as shown in Fig. 3. . Third
In the figure, 1 is a mounting bracket 2 is a ceramic heating element 3
The outer cylinder 4 is the resistor coil 11, and the heating wire 12,1 is
3 indicates a brazed joint, and 14 indicates a filling powder.
発明が解決しようとする問題点：
セラミツク発熱体と抵抗体用コイルを直接鑞付
け接合した上記第３図に示す自己制御型グロープ
ラグでは使用中に抵抗体４の温度が昇り鑞付部が
溶解したり、接触抵抗の変化を起し、プラグとし
ての温度特性の変化あるいは導通不良となる欠点
があつた。またコイルをセラミツク発熱体２と鑞
付けする場合に外筒３との場合にも同様である
が、H2又はH2＋N2の高温還元性雰囲気での鑞付
けが必要であるがこの鑞付け中に抵抗体用コイル
が高温で変形すること、及びコイル材が高温での
脆化を起して材料特性が著しく悪化する不具合が
あつた。例えば結晶粒の成長を起して粒界破断が
生じ易くなる等の問題があつた。Problems to be solved by the invention: In the self-regulating glow plug shown in FIG. 3, in which the ceramic heating element and the resistor coil are directly joined by brazing, the temperature of the resistor 4 rises during use, causing the brazed portion to melt. This has the drawback of causing a change in contact resistance, a change in the temperature characteristics of the plug, or poor conductivity. Also, when brazing the coil with the ceramic heating element 2, the same applies to the case of the outer cylinder 3, but it is necessary to braze in a high-temperature reducing atmosphere of H 2 or H 2 + N 2 . Among these problems were the resistor coil being deformed at high temperatures, and the coil material becoming brittle at high temperatures, resulting in a significant deterioration of material properties. For example, there were problems such as crystal grain growth and grain boundary rupture.
問題点を解決するための手段及実施例：
本発明はこれらの問題点を解決するための提案
であつて前記従来例の自己制御型セラミツクグロ
ープラグにおいて、中軸７とセラミツク発熱体２
の間に介設した電流制御用抵抗体用のコイル４を
二部分に分割して第１図及び第２図に示すよう
に、その一方のセラミツク発熱体側の部分は発熱
特性を低くするため該抵抗体用のコイル４の線径
より太い線径の線材を用いてリードコイル５と
し、セラミツク発熱体２と外筒３とリードコイル
５を同時に高温雰囲気内で鑞付け１２，１３した
後、リードコイル５端と抵抗体用コイル３端を突
合せアーク溶接、プラズマ溶接、レーザー溶接等
の手段で第２図に示す如く接合する。６は溶接部
を示す。この際太い線材のリードコイルの巻き方
向を抵抗体用コイルの巻き方向と反対にしておけ
ば両コイルの接合が比軟的容易である。Means and Embodiments for Solving the Problems: The present invention is a proposal for solving these problems, and in the self-regulating ceramic glow plug of the conventional example, the central shaft 7 and the ceramic heating element 2 are
As shown in Figures 1 and 2, the coil 4 for the current control resistor interposed between the two parts is divided into two parts, and one part on the ceramic heating element side is made of heat-generating material in order to lower the heat generation characteristics. The lead coil 5 is made of a wire with a wire diameter larger than that of the resistor coil 4, and the ceramic heating element 2, outer cylinder 3, and lead coil 5 are simultaneously brazed 12 and 13 in a high-temperature atmosphere, and then the leads are assembled. The 5th end of the coil and the 3rd end of the resistor coil are brought together and joined by arc welding, plasma welding, laser welding, or the like, as shown in FIG. 2. 6 indicates a welded portion. At this time, if the winding direction of the thick wire lead coil is opposite to the winding direction of the resistor coil, it is relatively easy to join both coils.
次にこの組立体１５を取付金具１の内腔内に配
して外筒３と好ましくは上記鑞材より軟化点の低
い鑞材を用いて鑞付け１６し、取付金具１の上端
開口部をガラス等のシール材８で加熱封着し、更
に絶縁体９を介して端子ナツト１０で固定してな
るグロープラグである。 Next, this assembly 15 is placed in the inner cavity of the mounting bracket 1, and is brazed 16 to the outer cylinder 3, preferably using a brazing material having a lower softening point than the solder material described above, and the upper end opening of the mounting bracket 1 is closed. The glow plug is heat-sealed with a sealing material 8 such as glass and further fixed with a terminal nut 10 via an insulator 9.
作用及び効果：
本発明の自己制御型セラミツクグロープラグで
はセラミツク発熱体と接合するリードコイルとし
て抵抗体用コイルに比し発熱特性の低い太径の線
材を用いたので、発熱体２とリードコイル５の鑞
付け接合部１２において鑞材が軟化溶融すること
が防止できることから、接触抵抗の変化に伴う温
度特性の劣化あるいは導通不良といつたグロープ
ラグとして致命的な問題が改善される。また外筒
とともにセラミツク発熱体に接合する際高温の還
元性雰囲気中の鑞付けでリードコイルは変形する
ことなく、且つ脆化を起して結晶粒成長による粒
界破断のような不具合の事態を生ずるおそれがな
い。Functions and Effects: In the self-controlling ceramic glow plug of the present invention, a large-diameter wire rod with lower heat generation characteristics than a resistor coil is used as the lead coil to be connected to the ceramic heating element, so that the heating element 2 and the lead coil 5 Since it is possible to prevent the brazing material from softening and melting at the brazed joint 12, problems fatal to glow plugs, such as deterioration of temperature characteristics or poor conduction due to changes in contact resistance, can be alleviated. Furthermore, when joining the outer cylinder to the ceramic heating element, the lead coil will not be deformed due to brazing in a high-temperature reducing atmosphere, and will not become brittle and cause defects such as grain boundary fracture due to grain growth. There is no risk of this occurring.
第１図は本発明の自己制御型セラミツクグロー
プラグの縦断正面図、第２図は仝じく組立体の正
面図、第３図は従来の仝型セラミツクグロープラ
グの縦断正面図である。
１……取付金具、２……セラミツク発熱体、３
……外筒、４……抵抗体用コイル、５……リード
コイル、６……溶接部、７……中軸、８……シー
ル材、９……絶縁材、１０……ナツト、１１……
発熱線コイル、１２，１３，１６……鑞付け接合
部、１４……充填粉末、１５……組立体。
FIG. 1 is a longitudinal sectional front view of a self-regulating ceramic glow plug of the present invention, FIG. 2 is a front view of the assembly, and FIG. 3 is a longitudinal sectional front view of a conventional two-type ceramic glow plug. 1...Mounting bracket, 2...Ceramic heating element, 3
... Outer cylinder, 4 ... Resistor coil, 5 ... Lead coil, 6 ... Welding part, 7 ... Center shaft, 8 ... Seal material, 9 ... Insulating material, 10 ... Nut, 11 ...
Heating wire coil, 12, 13, 16...brazed joint, 14...filling powder, 15...assembly.
Claims (1)
ため機関取付金具の先端部に設けたセラミツク発
熱体に電流制御用の抵抗体を直列に接続して成る
自己制御型グロープラグにおいて、前記抵抗体用
コイルの前記セラミツク発熱体側の一部を抵抗体
用コイルの線径より太い線径の線材でリードコイ
ルとして形成し、両コイルを接続して成る自己制
御型セラミツクグロープラグ。1. In a self-control glow plug consisting of a ceramic heating element provided at the tip of an engine mounting bracket and a current control resistor connected in series to control the temperature of the heating element when the temperature rises due to energization, the resistor A self-controlling ceramic glow plug in which a part of the body coil on the ceramic heating element side is formed as a lead coil using a wire having a wire diameter larger than that of the resistor coil, and both coils are connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21886186A JPS6373023A (en) | 1986-09-16 | 1986-09-16 | Self-controlling ceramic glow plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21886186A JPS6373023A (en) | 1986-09-16 | 1986-09-16 | Self-controlling ceramic glow plug |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6373023A JPS6373023A (en) | 1988-04-02 |
| JPH0313486B2 true JPH0313486B2 (en) | 1991-02-22 |
Family
ID=16726467
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21886186A Granted JPS6373023A (en) | 1986-09-16 | 1986-09-16 | Self-controlling ceramic glow plug |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6373023A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4572492B2 (en) * | 2000-11-13 | 2010-11-04 | ボッシュ株式会社 | Ceramic glow plug and manufacturing method thereof |
-
1986
- 1986-09-16 JP JP21886186A patent/JPS6373023A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6373023A (en) | 1988-04-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |