JPS6226419A - Glow plug of sheath type - Google Patents
Glow plug of sheath typeInfo
- Publication number
- JPS6226419A JPS6226419A JP16580985A JP16580985A JPS6226419A JP S6226419 A JPS6226419 A JP S6226419A JP 16580985 A JP16580985 A JP 16580985A JP 16580985 A JP16580985 A JP 16580985A JP S6226419 A JPS6226419 A JP S6226419A
- Authority
- JP
- Japan
- Prior art keywords
- coil
- resistor
- resistance
- temperature coefficient
- 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.)
- Pending
Links
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始動時
に副燃焼室内等を予熱する急速加熱型グローブ２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 glove 2 which is mainly installed in a diesel engine and preheats the auxiliary combustion chamber etc. at the time of startup.
一般にディーゼルエンジンは低温時における始動性が悪
い為に、エンジンヘッドに設けた副燃焼室等にグロープ
ラグを装着して、これに通電して赤熱し室内に噴射され
る燃料の一部を燃焼させて予熱する方法がとられておシ
、始動時に急速な昇温特性を持つことが要求されると共
（＝、近時は始動後に於ても燃焼安定化の為のアフター
グローとして長時間使用される傾向となっておＱ、その
性能の向上が益々要望されてきている。Diesel engines generally have poor starting performance at low temperatures, so a glow plug is attached to the auxiliary combustion chamber installed in the engine head, and when electricity is applied to it, it becomes red hot and burns part of the fuel injected into the interior. However, it is required to have a rapid temperature rise characteristic at the time of starting (=, recently, even after starting, it is used for a long time as an afterglow to stabilize combustion. Q, and there is an increasing demand for improved performance.
この目的を達成するため（二部度によって抵抗値がほと
んど変わらない発熱体コイルと正の大きな抵抗温度係数
を有する第１の抵抗体コイルとが直列に接続された構造
をもち加熱電流を制御するようにした自己制御型グロー
プラグ（特開昭５４−１０９５３８）が知られている。In order to achieve this purpose, the heating current is controlled by having a structure in which a heating element coil whose resistance value hardly changes depending on the temperature and a first resistor coil having a large positive temperature coefficient of resistance are connected in series. A self-control glow plug (Japanese Unexamined Patent Publication No. 109538/1983) is known.
第２図は従来のこの種シーズ型グロープラグの一例を示
す縦断面図で、抵抗温度係数の極く小さい線材からなる
発熱体コイル１とこれより大きな正の抵抗温度係数を有
する第１の抵抗体コイル２とが溶接３によって接続され
ておシ、発熱体コイルの他端は一端閉塞した金属性発熱
チューブ４の閉塞端内壁に導通的に接続され、第１の抵
抗体コイルの他端は端子ねじ６ａを有する棒状中心電極
６の先端に導通的に、接続され、これらの発熱体コイル
１、第１の抵抗体コイル２及び中心電極６の先端部とが
耐熱絶縁性充填物７を介して発熱チューブ４内に圧詰さ
れ、発熱チューブ４の開口部側が中空の取付金具８の先
端部に嵌入した状態でろう着され、中心電極６は絶縁体
１０を取付金具８との間に介在させて固定ナツト１１で
締付は固定されてなるものである。FIG. 2 is a vertical cross-sectional view showing an example of a conventional sheathed glow plug of this type, showing a heating element coil 1 made of a wire material with an extremely small temperature coefficient of resistance, and a first resistor having a larger positive temperature coefficient of resistance. The other end of the heating element coil is electrically connected to the inner wall of the closed end of the metallic heating tube 4 whose one end is closed, and the other end of the first resistor coil is connected to the first resistor coil 2 by welding 3. It is electrically connected to the tip of a rod-shaped center electrode 6 having a terminal screw 6a, and the heating element coil 1, first resistor coil 2, and the tip of the center electrode 6 are connected to each other through a heat-resistant insulating filler 7. The heat generating tube 4 is press-filled into the heat generating tube 4, and the opening side of the heat generating tube 4 is fitted into the tip of the hollow mounting bracket 8 and soldered to the center electrode 6, with the insulator 10 interposed between the center electrode 6 and the mounting bracket 8. The fixing nut 11 is used to fix the tightening.
上記の構造を有するシーズ型グロープラグの通電温度特
性を第３図において■−２線で示すが、。The energization temperature characteristics of the sheathed glow plug having the above structure are shown by the -2 line in FIG.
ディーゼルエンジンの始動操作において予熱時間を短縮
することを目的として発熱体コイル１及び第１の抵抗体
コイル２の温度の上昇によりＡ領域において発熱チュー
ブの温度は急速に上昇し、その後は温度上昇に伴なう第
１の抵抗体コイルの抵抗値が増大することによりアフタ
ーグロ一時のＢ領域において通電電流を低減させて発熱
チューブの温度を制御する自己制御作用を有するもので
ある。In order to shorten the preheating time in the starting operation of a diesel engine, the temperature of the heat generating tube increases rapidly in area A due to the rise in the temperature of the heat generating coil 1 and the first resistor coil 2, and then the temperature continues to rise. It has a self-control function that controls the temperature of the heating tube by reducing the current flowing in region B during afterglow by increasing the resistance value of the first resistor coil.
〔発明が解決しようとする問題点）
しかし乍ら、上記せる従来のグロープラグは、自己制御
作用によす′＠３図の■−２線で示す如く発熱チューブ
の温度は制御されているとはいえ飽和状態にあシ、アフ
ターグロ一時の温度としては必要以上に高温であシ、継
続通電によって追熱されグロープラグとしての寿命が短
くなる。これを防止するためには更に外部にドロンピン
グレジスターを連結して保護する必要がちシ、そのため
（二余分なハーネス等の配線を必要とすること、レジス
ターの過熱防止策を講する必要のあること等の問題があ
った。[Problems to be Solved by the Invention] However, in the conventional glow plug described above, the temperature of the heating tube is controlled by the self-control function, as shown by the line ■-2 in Figure 3. However, it is in a saturated state, and the temporary afterglow temperature is higher than necessary, and continued energization generates additional heat, shortening the life of the glow plug. In order to prevent this, it is necessary to further connect and protect the dromping resistor externally, which requires extra wiring such as a harness, and it is necessary to take measures to prevent the resistor from overheating. There were other problems.
本発明は上記せる問題点を解決するためになされた本の
で、棒状中心電極を発熱チューブ内に圧詰された中心電
極軸と、端子ねじを有する端子軸とに分割し、これらの
間に第１の抵抗体コイルト同等もしくは同等以上に大き
い抵抗温度係数を有する材料からなる抵抗体コイルを導
電的に直列に接続すると共にこの第２の抵抗体コイルが
取付金具内に配設されることにより、外部のドロッピン
グレジスターを使用しなくとも発熱体チューブの温度が
所期の温度に達した後のアフターグロ一時の発熱体チュ
ーブの温度を低くして過熱を防止するようにしたシーズ
型グロープラグとするものである。The present invention was developed to solve the above-mentioned problems, and the rod-shaped center electrode is divided into a center electrode shaft packed in a heating tube and a terminal shaft having a terminal screw. By conductively connecting in series resistor coils made of a material having a temperature coefficient of resistance equal to or greater than that of the first resistor coil, and disposing this second resistor coil within the mounting bracket, A sheath type glow plug that prevents overheating by lowering the temperature of the heating element tube temporarily during afterglow after the temperature of the heating element tube reaches the desired temperature without using an external dropping resistor. It is something.
上記本発明によるシーズ型グロープラグは、第１の抵抗
体コイルが正の大きな抵抗温度係数をもち発熱体チュー
ブの中に埋設されているので発熱体ならびに抵抗体とし
ての働きをし、エンジン始これらの抵抗値が増加してＭ
発熱体コイル。In the sheathed glow plug according to the present invention, the first resistor coil has a large positive temperature coefficient of resistance and is embedded in the heating element tube, so it functions as a heating element and a resistor. The resistance value of M increases
Heating element coil.
第１の抵抗体コイル及び第２の抵抗体コイルの合成抵抗
が次第に大きくなって通電電流が小さくなる。なお、第
１の抵抗体コイルと第２の抵抗体コイルと二つの抵抗体
を有することにより、これらの抵抗値及び抵抗温度係数
の線材を選ぶこと（二よって従来のシーズ型グロープラ
グよシも自由に始などの温度に依存されない比較的温度
の低い取付金具内に位置させること（：よって制御時間
を遅らせることができる。The combined resistance of the first resistor coil and the second resistor coil gradually increases, and the applied current decreases. In addition, by having two resistors, the first resistor coil and the second resistor coil, it is necessary to select a wire material with a resistance value and a temperature coefficient of resistance (2). Freely located in a relatively cool fitting that is not temperature dependent (thus slowing down the control time).
〔実施例〕
第１図は本発明によるシーズ型グロープラグの実施例で
、Ｆｅ−０ｒ等からなる抵抗温度係数の小さい発熱体コ
イル１の一端が耐熱金属からなる一端閉塞した発熱チュ
ーブ４の閉塞端内壁に溶接され、他端がＮｉ 、 Ｆｅ
等からなる正の大きな抵抗温度係数を有し発熱体かつ抵
抗体となる第１の抵抗体コイル２の一端に直列に接続さ
れ、第１の抵抗体コイル２の他端が中心電極軸６−重の
先端に溶接され。[Example] Fig. 1 shows an example of a sheathed glow plug according to the present invention, in which one end of the heating element coil 1, which is made of Fe-0r or the like and has a small temperature coefficient of resistance, is made of a heat-resistant metal and the one end of the heating tube 4 is closed. The end is welded to the inner wall, and the other end is Ni, Fe.
The other end of the first resistor coil 2 is connected in series to one end of the first resistor coil 2, which has a large positive temperature coefficient of resistance and serves as a heating element and a resistor. Heavy welded on the tip.
イル５の一端が端子ねじ６ａを有する端子軸６−８の先
端に、他端が中心電極軸６−８の後端に溶接されてなる
構造物が端子軸り、の後端末を裸出させたまま耐熱絶縁
性充填物７を介して発熱チューブ内置＝圧詰され、この
発熱チューブ４が取付金具８の内腔（二挿設されて取付
金具８の内腔内にろう着され、このとき取付金具の内腔
内に第２の抵抗体コイル５が位置するよ）に配設され、
更に端子軸６−１が絶縁体１０を取付金具８との間に介
在させて固定ナツト１１で締付は固定されてなるもので
ある。なお、発熱体コイル１、第１の抵抗体コイル２及
び第２の抵抗体コイル５の初期抵抗値はそれぞれ約０．
６Ω、約０．１Ω及び約０．１Ωとした。One end of the coil 5 is welded to the tip of the terminal shaft 6-8 having the terminal screw 6a, and the other end is welded to the rear end of the center electrode shaft 6-8. The heat-generating tube 4 is placed inside the heat-resistant insulating filler 7 (pressurized), and the heat-generating tube 4 is inserted into the inner cavity of the mounting bracket 8 and soldered into the inner cavity of the mounting bracket 8. The second resistor coil 5 is located in the lumen of the mounting bracket),
Furthermore, the terminal shaft 6-1 has an insulator 10 interposed between it and the mounting fitting 8, and is fixedly tightened with a fixing nut 11. Note that the initial resistance values of the heating element coil 1, the first resistor coil 2, and the second resistor coil 5 are each about 0.
6Ω, approximately 0.1Ω, and approximately 0.1Ω.
上記実施例のシーズ型グロープラグの上記三つのコイル
の合成抵抗値の通電時間（：対する変化及び発熱チュー
ブの通電温度特性はそれぞれ第５図の■−１線及び■−
２線のようになった。The change in the combined resistance value of the three coils of the sheathed glow plug of the above example with respect to the energization time (:) and the energization temperature characteristics of the heat generating tube are shown in Figure 5, respectively, by the ■-1 line and ■-
It became like two lines.
第３図における通電温度特性の本発明例の■−２線と従
来例の■−２線との比較から明らかなように１本発明の
シーズ型グロープラグは急速加熱を必要とするエンジン
始動時（二おける昇温特性をそれ程損わずに、始動後の
アフターグロ一時ζ二おける発熱チューブの温度を低減
させることができた。因みにアフターグロ一時の温度は
８００℃ぐらいあれば十分である。このように本発明の
グロープラグは抵抗体コイルをプラグ内に増設したこと
によル、アフターグロ一時の発熱チューブの必要以上の
過熱を防止することができ、外部に別にドロッピングレ
ジスターを設ける必要がなく配線構造その他側部システ
ム全体が簡素化できるのみでなく、経済性、安定性の優
れたシーズ製グロープラグとして提供できる。As is clear from the comparison of the energization temperature characteristics of the ■-2 line of the present invention example and the ■-2 line of the conventional example in FIG. (It was possible to reduce the temperature of the heating tube during the afterglow period after startup without significantly impairing the temperature increase characteristics during the second period. Incidentally, a temperature of about 800°C during the afterglow period is sufficient. In this way, the glow plug of the present invention can prevent the heating tube from overheating more than necessary during afterglow by adding a resistor coil inside the plug, and there is no need to provide a separate external dropping resistor. Not only can the wiring structure and other side systems as a whole be simplified, but it can also be provided as a seeded glow plug with excellent economic efficiency and stability.
第１図は本発明シーズ型グロープラグの実施例を示す縦
断面図、第２図は従来例のシーズ型グローブラ°グを示
す縦断面図、第３図はシーズ型グロープラグの通電特性
で■−１．■−２はそれぞれ本発明の実施例プラグの抵
抗及び温度特性、■−１、■−２はそれぞれ従来例プラ
グの抵抗及び温度特性を示す。
１：発熱体コイル ２：第１の抵抗体コイル（発熱体と
しても働く） ４：発熱チューブ ５：第２の抵抗体コ
イル ６二中心電極 ６−４：端子軸 ６−！：中心電
極軸 ８：取付金具 １ｏ：絶縁体 １１：固定ナツト
代理人 弁理士 竹 内 守
第１図 第２図Fig. 1 is a longitudinal sectional view showing an embodiment of the sheathed glow plug of the present invention, Fig. 2 is a longitudinal sectional view showing a conventional sheathed glow plug, and Fig. 3 shows the current conduction characteristics of the sheathed glow plug. -1. 2-2 shows the resistance and temperature characteristics of the plug according to the embodiment of the present invention, and 2-1 and 2-2 show the resistance and temperature characteristics of the conventional plug, respectively. 1: Heating element coil 2: First resistor coil (also works as a heating element) 4: Heat generating tube 5: Second resistor coil 6 Two center electrodes 6-4: Terminal shaft 6-! : Center electrode shaft 8: Mounting bracket 1o: Insulator 11: Fixing nut Agent Patent attorney Mamoru Takeuchi Figure 1 Figure 2
Claims (1)
の開口側部が嵌着され、これらの軸芯に端子ねじを有す
る棒状中心電極が挿設され、抵抗温度係数の小さな材料
からなる発熱体コイ ルとこれより大きな正の抵抗温度係数を有する第１の抵
抗体コイルとが直列に接続され、発 熱体コイルの他端が発熱チユーブの閉塞端内壁に、第１
の抵抗体コイルの他端が棒状中心電極の先端にそれぞれ
導電的に接続されて、これらの発熱体コイルと棒状中心
電極の先端部とが発熱チューブ内に絶縁物を介して収納
されてなるシーズ型グロープラグにおいて、棒状中心電
極が発熱チユーブ内に圧詰された中心電極軸と端子ねじ
を有する端子軸に分割され、これらの両者の中間に第１
の抵抗体コイルと同等もしくは同等以上に大きい抵抗温
度係数を有する材料からなる第２の抵抗体コイルが直列
に接続され、前記第２の抵抗体コイルの取付金具内腔内
に位置するように挿設されてなることを特徴とするシー
ズ型グロープラグ。[Claims] The open side of a metal heat-generating tube with a closed end is fitted into a hollow mounting bracket, and a rod-shaped center electrode with a terminal screw is inserted into the axis of these tubes, and the temperature coefficient of resistance is A heating element coil made of a small material and a first resistance coil having a larger positive temperature coefficient of resistance are connected in series, and the other end of the heating element coil is connected to the inner wall of the closed end of the heating tube.
The other ends of the resistor coils are electrically conductively connected to the tips of the rod-shaped center electrodes, and these heating coils and the tips of the rod-shaped center electrodes are housed in a heating tube with an insulator interposed therebetween. In a type glow plug, a rod-shaped center electrode is divided into a center electrode shaft packed in a heating tube and a terminal shaft having a terminal screw, and a first
A second resistor coil made of a material having a temperature coefficient of resistance equal to or greater than that of the resistor coil is connected in series and inserted so as to be located within the bore of the mounting bracket of the second resistor coil. A sheath type glow plug characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16580985A JPS6226419A (en) | 1985-07-29 | 1985-07-29 | Glow plug of sheath type |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16580985A JPS6226419A (en) | 1985-07-29 | 1985-07-29 | Glow plug of sheath type |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6226419A true JPS6226419A (en) | 1987-02-04 |
Family
ID=15819405
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16580985A Pending JPS6226419A (en) | 1985-07-29 | 1985-07-29 | Glow plug of sheath type |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6226419A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002033149A1 (en) * | 2000-10-17 | 2002-04-25 | Bosch Automotive Systems Corporation | Ceramic heater type glow plug and method of manufacturing the glow plug |
| WO2004000714A1 (en) * | 2001-06-06 | 2003-12-31 | Totetu Mfg. Co. Ltd. | Removing device for heavy article hoisting sling |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60117030A (en) * | 1983-11-30 | 1985-06-24 | Jidosha Kiki Co Ltd | Glow plug for diesel engine |
-
1985
- 1985-07-29 JP JP16580985A patent/JPS6226419A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60117030A (en) * | 1983-11-30 | 1985-06-24 | Jidosha Kiki Co Ltd | Glow plug for diesel engine |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002033149A1 (en) * | 2000-10-17 | 2002-04-25 | Bosch Automotive Systems Corporation | Ceramic heater type glow plug and method of manufacturing the glow plug |
| WO2004000714A1 (en) * | 2001-06-06 | 2003-12-31 | Totetu Mfg. Co. Ltd. | Removing device for heavy article hoisting sling |
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