JPH0318091B2 - - Google Patents
Info
- Publication number
- JPH0318091B2 JPH0318091B2 JP61036659A JP3665986A JPH0318091B2 JP H0318091 B2 JPH0318091 B2 JP H0318091B2 JP 61036659 A JP61036659 A JP 61036659A JP 3665986 A JP3665986 A JP 3665986A JP H0318091 B2 JPH0318091 B2 JP H0318091B2
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- heating element
- coil
- connecting pin
- 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 - Lifetime
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
Landscapes
- Resistance Heating (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は内燃機関特にデイーゼルエンジンに使
用するグロープラグに関し、従来品に比し耐久性
の向上と温度制御効果の改善された製品を提供し
ようとするものである。[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to glow plugs used in internal combustion engines, particularly diesel engines, and provides a product with improved durability and temperature control effect compared to conventional products. That is.
（従来の技術）
グロープラグに対する予熱用の電流に従つて温
度制御の機能を具えたグロープラグとしては金属
チユーブ内の閉鎖された一端の底部に一端を接続
した発熱体と該発熱体の他端に電流制御用の正の
大きな抵抗温度係数の抵抗体を直列接続して絶縁
粉末中に埋設した第５図および第６図に示すもの
が特開昭54−109538号公報などによつて知られて
いる。(Prior Art) A glow plug that has a temperature control function according to a preheating current for the glow plug includes a heating element whose one end is connected to the bottom of one closed end in a metal tube, and the other end of the heating element. 5 and 6, in which a resistor with a large positive temperature coefficient of resistance for current control is connected in series and embedded in insulating powder, is known from Japanese Patent Laid-Open No. 109538/1983. ing.
（発明が解決しようとする問題点）
第５図に要部を示した従来例のグロープラグで
は発熱体２と接合部Ａで直接接続する抵抗体３と
して正の大きい抵抗温度係数を有する抵抗体を用
いるので、この場合抵抗体は自己発熱によらず大
部分は発熱体２によつて加熱されたシーズからの
伝熱により抵抗が上昇するので発熱体２の電流制
御がスムーズに行われて最高温度は1200℃以下に
抑制されるれ点で申分ないが、発熱体２が正の小
さい抵抗温度係数を有する金属材で形成されてい
るために発熱体の予熱時間を極めて短縮する急速
加熱特性が要求される場合には十分満足すべき発
熱が得られないおそれがあつた。さらに発熱体と
抵抗体が直接接続されているため抵抗体が発熱体
の発熱の影響を受け早く昇温し、且つ過熱し易い
ために劣化し易い欠点があり、温度制御効果が小
さくなる不具合もあつた。また抵抗体がシーズチ
ユーブの先端寄りにあるためエンジン燃焼により
被熱し劣化し易い欠点もあつた。(Problems to be Solved by the Invention) In the conventional glow plug whose main parts are shown in FIG. In this case, the resistance of the resistor increases not due to self-heating but mostly due to heat transfer from the seeds heated by the heating element 2, so the current control of the heating element 2 is performed smoothly and the maximum The temperature is kept to below 1200℃, which is satisfactory, but since the heating element 2 is made of a metal material with a small positive temperature coefficient of resistance, it has a rapid heating characteristic that extremely shortens the preheating time of the heating element. If this is required, there is a risk that a sufficiently satisfactory heat generation may not be obtained. Furthermore, since the heating element and the resistor are directly connected, the resistor is affected by the heat generated by the heating element, and the temperature rises quickly. Moreover, it is easily overheated and deteriorates easily, which also reduces the temperature control effect. It was hot. Also, since the resistor was located near the tip of the sheath tube, it was easily exposed to heat due to engine combustion and deteriorated easily.
（問題点を解決するための手段）
本発明は上記問題点を解決すべく提案されたも
ので、急速加熱特性を向上し、製作容易なグロー
プラグの提供を目的とするものであり、グロープ
ラグにおける発熱体コイルと抵抗体コイルの端部
を両端に段付径小部を形成した接続ピンにそれぞ
れ嵌合して接続してなるものである。(Means for Solving the Problems) The present invention was proposed to solve the above problems, and aims to provide a glow plug that improves rapid heating characteristics and is easy to manufacture. The end portions of the heating element coil and the resistor coil are respectively fitted and connected to connecting pins having stepped small diameter portions formed at both ends.
（実施例）
第１図の本発明のグロープラグの実施例にもと
づいて詳説すれば、一端を閉鎖して底部２３を形
成した金属チユーブ１内の前記底部２３に発熱体
コイル２の一端を接続し、他端９と中軸４に接続
する抵抗体コイル３の他端１０との間に段付径小
部７，８を備える接続ピン６を介設しその段付径
小部７，８に両コイル端部９，１０を夫々溶接１
１，１２を施して接合したものである。(Embodiment) To explain in detail based on the embodiment of the glow plug of the present invention shown in FIG. 1, one end of the heating element coil 2 is connected to the bottom 23 in the metal tube 1, which has one end closed to form the bottom 23. A connecting pin 6 having stepped small diameter portions 7 and 8 is interposed between the other end 9 and the other end 10 of the resistor coil 3 connected to the center shaft 4. Both coil ends 9 and 10 are welded 1
1 and 12 were applied and joined.
第２図は接続ピン各種の実施例を示すもので、
ａは中央部を細径部１６と両端径小部７，８との
間にフランジ２４，２５を介設した接続ピンで該
径小部７，８にコイル端を溶接止めした例、ｂは
同じく両端径小部７，８に溶接止めしたものであ
るか中空部１７を有する管状接続ピンの例、その
他コイル端の径に応じてピンの両端をテーパー状
にして溶接止めすることも可能である。接続方法
も溶接のほか圧着等色々の手段が採用される。 Figure 2 shows examples of various connection pins.
A shows an example in which the coil ends are welded to the small diameter parts 7 and 8 using a connection pin with flanges 24 and 25 interposed between the small diameter part 16 at the center and the small diameter parts 7 and 8 at both ends. Similarly, it is possible to use a tubular connecting pin which is welded to the small diameter portions 7 and 8 at both ends or has a hollow portion 17, and it is also possible to weld both ends of the pin into a tapered shape depending on the diameter of the coil end. be. In addition to welding, various methods such as crimping can be used for connection.
（発明の効果）
接続ピンの長さを電源及び外形仕様に応じて適
切な値に設定することにより、第３図に示すよう
に抵抗体全長のうち取付金具内に収る部分に長さ
１及び取付金具と金属チユーブ管の間隙ｄの寸法
を任意に選択することにより温度制御作用が自由
に設定できる。本発明の温度制御効果は第４図に
示すように改善される。すなわち接続ピンを用い
れば抵抗体の温度を抑制するとともに抵抗体が取
付金具に近づくか又は抵抗体の一部が金具内側に
位置すればその長さ１の分だけエンジン燃焼によ
る抵抗体の被熱温度が下がり、劣化が防止され耐
久性の向上に資し、従来の1000Hr位のものは倍
加し且つ温度制御効果としては昇温速度は従来
900℃、６秒の限度であつたものが接続ピン使用
により３〜４秒で900℃に到達可能である。しか
も最高温度は低く抑制され、上記の如く耐久性を
ます効果がある。また特に本発明は両コイルの嵌
合代が段付径小部によつて一定となるため抵抗値
のバラツキが生じにくく、且つ両コイルの偏心も
生じにくく、金属チユーブ内での偏心が少なくな
つて絶縁性が確保され断線が生じない効果があ
る。(Effect of the invention) By setting the length of the connecting pin to an appropriate value according to the power source and external specifications, a length of 1 is added to the portion of the total length of the resistor that fits inside the mounting bracket, as shown in Figure 3. By arbitrarily selecting the size of the gap d between the fitting and the metal tube, the temperature control effect can be freely set. The temperature control effect of the present invention is improved as shown in FIG. In other words, if a connecting pin is used, the temperature of the resistor can be suppressed, and if the resistor is close to the mounting bracket or a part of the resistor is located inside the bracket, the resistor will be heated by the engine combustion by the length 1. It lowers the temperature, prevents deterioration, and improves durability, doubles the conventional 1000Hr, and has a temperature control effect that is faster than before.
What used to be the limit of 900°C for 6 seconds can now reach 900°C in 3 to 4 seconds by using a connecting pin. Moreover, the maximum temperature is suppressed to a low level, which has the effect of increasing durability as described above. In particular, in the present invention, since the fitting margin of both coils is constant due to the stepped small diameter portion, variations in resistance value are less likely to occur, and eccentricity of both coils is also less likely to occur, reducing eccentricity within the metal tube. This has the effect of ensuring insulation and preventing disconnection.
第１図は本発明接続ピン使用のグロープラグの
要部縦断面図、第２図ａ，ｂは各種接続ピンとコ
イルとの接続を示す縦断面図。第３図は同じく取
付金具内に収る抵抗体の長さｌと取付金具金属チ
ユーブ間の間隙ｄ、接続ピンの装備関係を示す縦
断面図、第４図は本発明接続ピン使用のグロープ
ラグと従来のグロープラグの特性曲線の対照図、
第５及び第６図は従来のグロープラグの例を縦断
面図で示したものである。
１……金属チユーブ、２……発熱体、３……抵
抗体、４……中軸、５……絶縁粉末、６……接続
ピン、７，８……径小部、９，１０……コイル端
部、１１，１２……溶接部、１４……取付金具、
１４ａ……中空孔、１４ｂ……取付金具端面、２
３……底部。
FIG. 1 is a vertical cross-sectional view of a main part of a glow plug using the connecting pin of the present invention, and FIGS. 2 a and 2 b are vertical cross-sectional views showing connections between various connecting pins and coils. Figure 3 is a longitudinal sectional view showing the length l of the resistor that fits within the mounting bracket, the gap d between the metal tubes of the mounting bracket, and the equipment of the connecting pin, and Figure 4 is a glow plug using the connecting pin of the present invention. Comparison diagram of characteristic curves of and conventional glow plugs,
FIGS. 5 and 6 are longitudinal cross-sectional views of examples of conventional glow plugs. 1... Metal tube, 2... Heating element, 3... Resistor, 4... Center shaft, 5... Insulating powder, 6... Connection pin, 7, 8... Small diameter part, 9, 10... Coil End portion, 11, 12... welding part, 14... mounting bracket,
14a...Hollow hole, 14b...Mounting bracket end surface, 2
3...Bottom.
Claims (1)
内の前記底部に一端を接続した発熱体コイルの他
端と中軸に接続する電流制御用の抵抗体コイル端
との間に接続ピンを介設したグロープラグにおい
て、前記接続ピンに発熱体コイル及び抵抗体コイ
ルの各端部が夫々嵌合する段付径小部を形成して
前記段付径小部に接続してなるグロープラグ。1 A connecting pin is interposed between the other end of the heating element coil, one end of which is connected to the bottom in a metal tube whose end is closed to form a bottom, and the end of the current control resistor coil connected to the center shaft. In the glow plug, a stepped small-diameter portion is formed on the connecting pin, into which each end of a heating element coil and a resistor coil fit, respectively, and connected to the stepped small-diameter portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3665986A JPS62194117A (en) | 1986-02-20 | 1986-02-20 | Sheathed glow plug used for diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3665986A JPS62194117A (en) | 1986-02-20 | 1986-02-20 | Sheathed glow plug used for diesel engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62194117A JPS62194117A (en) | 1987-08-26 |
| JPH0318091B2 true JPH0318091B2 (en) | 1991-03-11 |
Family
ID=12475984
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3665986A Granted JPS62194117A (en) | 1986-02-20 | 1986-02-20 | Sheathed glow plug used for diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62194117A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120178075A1 (en) * | 2009-09-17 | 2012-07-12 | Unimatec Co., Ltd. | Emulsion and mold-releasing agent using the same |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2745225B2 (en) * | 1989-02-15 | 1998-04-28 | 自動車機器株式会社 | Glow plug for diesel engine |
| JPH0814376B2 (en) * | 1989-09-11 | 1996-02-14 | 自動車機器株式会社 | Self temperature control glow plug |
| CA3029512A1 (en) * | 2016-07-13 | 2018-01-18 | Nippon Steel & Sumitomo Metal Corporation | Hot-stamping formed article, structural member using the same, and manufacturing method of hot-stamping formed article |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5726326A (en) * | 1980-07-22 | 1982-02-12 | Ngk Spark Plug Co Ltd | Preheat current controlling type glow plug |
| JPS6043865U (en) * | 1983-09-02 | 1985-03-28 | 自動車機器株式会社 | Glow plug for diesel engine |
| JPS6170321A (en) * | 1984-09-12 | 1986-04-11 | Jidosha Kiki Co Ltd | Self temperature control type glow plug |
-
1986
- 1986-02-20 JP JP3665986A patent/JPS62194117A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120178075A1 (en) * | 2009-09-17 | 2012-07-12 | Unimatec Co., Ltd. | Emulsion and mold-releasing agent using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62194117A (en) | 1987-08-26 |
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