JPS6086325A - Self-control type ceramic glow plug - Google Patents
Self-control type ceramic glow plugInfo
- Publication number
- JPS6086325A JPS6086325A JP19243783A JP19243783A JPS6086325A JP S6086325 A JPS6086325 A JP S6086325A JP 19243783 A JP19243783 A JP 19243783A JP 19243783 A JP19243783 A JP 19243783A JP S6086325 A JPS6086325 A JP S6086325A
- Authority
- JP
- Japan
- Prior art keywords
- rear end
- metal tube
- sleeve
- center shaft
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23Q—IGNITION; EXTINGUISHING-DEVICES
- F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
- F23Q7/001—Glowing plugs for internal-combustion engines
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
Description
【発明の詳細な説明】
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自己制御型グロープラグに関
するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention mainly relates to a self-control type glow plug that is installed in a diesel engine and preheats an auxiliary combustion chamber and the like during 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
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に、近時は始動後に於ても
燃焼安定化の為の77ターグローとして長時間使用され
る傾向となっており、その耐久性の向上が益々必要とさ
れてきている。In general, diesel engines have poor starting performance at low temperatures, so a method is to install a glow plug in the auxiliary combustion chamber, turn it on, make it red hot, and burn part of the fuel injected into the room to preheat it. In addition to being required to have a rapid temperature rise characteristic at the time of starting, there is a recent trend of using 77 Targlow for a long time to stabilize combustion even after starting. There is an increasing need for improved durability.
この目的に応する急速加熱型グロープラグとして、高融
点金属の発熱線をセラミック粉体中に埋設し焼結してな
るセラミックヒータ−を発熱体として用い、更に急速昇
温時における発熱線の溶断あるいは熱衝撃によるセラミ
ック割れ等を防止するため、該発熱体に1発熱線より大
きい正の抵抗温度係数をもつ線材を用いた抵抗体を直列
に接続し、発熱体の加熱電流を制御するようにした構造
をもつ自己制御型セラミックグロープラグが知られてい
る。As a rapid heating type glow plug suitable for this purpose, a ceramic heater made by embedding a heating wire of a high melting point metal in ceramic powder and sintering it is used as the heating element, and the heating wire is fused when the temperature rises rapidly. Alternatively, in order to prevent ceramic cracking due to thermal shock, a resistor using a wire material with a positive temperature coefficient of resistance greater than 1 heating wire is connected in series to the heating element to control the heating current of the heating element. A self-regulating ceramic glow plug with a similar structure is known.
第1図は、この種グロープラグの従来例を示したもので
ちゃ、発熱体となるセラミックヒータ−1は、発熱線2
をセラミック焼結体中に埋設して成シ金属外筒3の内腔
にろう接されると共に発熱線2の一端2aが電気的に接
続され、金属外筒3は取付金具4の先端部内腔にろう接
されてe側電極が構成されている。一方発熱線2の他端
2bはセラミックヒータ−1の後端部に嵌着された金属
キャップ5にろう接され、このキャップ5に溶接された
リード電極軸6を経て抵抗体コイル7に電気的に接続さ
れ、抵抗体コイル7の他端は中軸8の先端部に接続され
ている。Fig. 1 shows a conventional example of this type of glow plug.
is embedded in a ceramic sintered body and soldered to the inner cavity of the formed metal outer cylinder 3, and one end 2a of the heating wire 2 is electrically connected. The e-side electrode is formed by soldering to the electrode. On the other hand, the other end 2b of the heating wire 2 is soldered to a metal cap 5 fitted to the rear end of the ceramic heater 1, and electrically connected to the resistor coil 7 via a lead electrode shaft 6 welded to the cap 5. The other end of the resistor coil 7 is connected to the tip of the center shaft 8.
而して前記せる取付金具4の内腔内におけるセラミック
ヒータ−1と抵抗体コイルT及び中軸8との接続構成部
分は、該内腔にガラス粉末9が充填されて加熱封着され
、中軸8は、取付金具4の後端部で絶縁体10を介在さ
せて丸ナツト11で締付は固定され■側の端子電極とな
る構造をもつものである。The connection component between the ceramic heater 1, the resistor coil T, and the center shaft 8 in the inner cavity of the mounting bracket 4 is sealed by heating by filling the inner cavity with glass powder 9. This has a structure in which the rear end of the mounting bracket 4 is tightened and fixed with a round nut 11 with an insulator 10 interposed therebetween, and serves as a terminal electrode on the ■ side.
か\る構造を有する従来のこの種自己制御型セラミック
グローブ2グは、通電昇温時において抵抗体の線材と発
熱線の線材との抵抗温度係数の差によル、抵抗体の温度
が発熱線よ如速かに増加し。In the conventional self-regulating ceramic globe 2, which has such a structure, the temperature of the resistor increases due to the difference in temperature coefficient of resistance between the wire of the resistor and the wire of the heat-generating wire when electricity is applied and the temperature rises. The line increases rapidly.
これに伴なって抵抗値が、増加することによって発熱線
の加熱電流を減少させ1発熱体の過熱を防止できる優れ
た特長を有するものであるが、第1図に示したように抵
抗体コイル7と中軸8及びセラミックヒータ−1の接続
構成部分を取付金具4内腔内にガラスで封着しているた
め、抵抗体コイル1の発熱、冷却の繰返しによってガラ
スとの膨張係数の差によ)ガラスが割れ封着性が阻害さ
れるほか割れた部分から外部の空気が侵入し抵抗体コイ
ルTの酸化が促進され耐久性を低下させるという問題が
あった。Along with this, the resistance value increases, which reduces the heating current of the heating wire and prevents the heating element from overheating. 7, the center shaft 8, and the ceramic heater 1 are sealed in the inner cavity of the mounting bracket 4 with glass. ) There was a problem in that the glass broke and the sealing properties were impaired, and outside air entered through the broken part, promoting oxidation of the resistor coil T and reducing its durability.
本発明は前記せる如き問題点を解決した耐久性が向上さ
れ、組立ての容易な自己制御型セラミックグロープラグ
を提供しようとするものである。The present invention aims to provide a self-regulating ceramic glow plug that solves the above-mentioned problems, has improved durability, and is easy to assemble.
以下本発明につき図面を用いて詳細に説明する。The present invention will be explained in detail below with reference to the drawings.
第2図は本発明自己制御型セラミックグローブ2グの要
部構造を示す実施例の縦断面図で、第1図と同一部分を
同一符号で示したものである。FIG. 2 is a longitudinal cross-sectional view of an embodiment showing the main structure of a self-regulating ceramic globe 2 according to the present invention, and the same parts as in FIG. 1 are designated by the same reference numerals.
図において、7は線材に抵抗温度係数の大きいニッケル
(阻)もしくは鉄(Fりを用いた抵抗体コイルで、その
一端は、取付金具4の後端部よ)突出して■側端子電極
となる中軸8の先端部8aに接続され、他端は、線材に
抵抗体コイルの線材よシ小さい抵抗温度係数をもつ例え
ばタングステン(W)にレニウム(Rりを添加したW合
金を用いたセラミックヒータ−の発熱線(第2図では省
略して図示せず)に接続するリード電極軸6に接続され
てお)、抵抗体コイル7と、中軸8及びリード電極軸6
の一部を含む接続構成部分は金属チューブ12で覆われ
、その内腔に充填された例えばマグネシア粉末等の耐熱
絶縁材13中に埋設され固着されて成シ、さらに金属チ
ヱープ12の後端部には金属もしくはセラミックのスリ
ーブ14が挿嵌されてその一部14aが金属チューブ1
2の後端面から突出して中軸8を覆うように配設され、
金属チヱープ12の後端部及び中軸8がスリーブ14の
内腔内でガラスシール15され一体化した中軸組立体1
6として形成されておル、この中軸組立体16が取付金
A4の後端開口部からその内腔に挿入されスリーブ14
の先端面を内腔内の股座4aに当接して係止され、その
自由端局面を取付金具4の後端開口部局縁4bで加締め
、中軸組立体16が取付金具 4の内腔に固定されて成
る構造をもつものである。In the figure, 7 is a resistor coil made of nickel or iron (F), which has a large temperature coefficient of resistance, and one end of which protrudes from the rear end of the mounting bracket 4 to become the ■ side terminal electrode. It is connected to the tip 8a of the center shaft 8, and the other end is connected to a ceramic heater using a wire having a smaller temperature coefficient of resistance than the wire of the resistor coil, for example, a W alloy made of tungsten (W) and rhenium (R). (connected to the lead electrode shaft 6 which is connected to the heating wire (omitted and not shown in FIG. 2)), the resistor coil 7, the center shaft 8 and the lead electrode shaft 6.
The connection component including a part of the metal tube 12 is covered with a metal tube 12, and is embedded and fixed in a heat-resistant insulating material 13, such as magnesia powder, filled in the inner cavity of the metal tube 12. A metal or ceramic sleeve 14 is inserted into the metal tube 1, and a portion 14a of the metal or ceramic sleeve 14 is inserted into the metal tube 1.
2 is arranged so as to protrude from the rear end surface of the central shaft 8 and cover the central shaft 8,
A center shaft assembly 1 in which the rear end of the metal chip 12 and the center shaft 8 are integrated with a glass seal 15 within the inner cavity of the sleeve 14.
The center shaft assembly 16 is inserted into the bore of the fitting A4 from the rear end opening of the sleeve 14.
The distal end surface of the crotch seat 4a in the inner cavity is held in contact with the crotch seat 4a, and its free end curve is crimped with the rear end opening edge 4b of the mounting bracket 4, and the center shaft assembly 16 is inserted into the inner cavity of the mounting bracket 4. It has a fixed structure.
前記せる中軸組立体16は、第5図(第2図と同一部分
は同一符号で示す)印に示す如く中軸8及びリード電極
軸6に接続された抵抗体コイル7の内部空間にマグネシ
ア等の耐熱絶縁粉末で予備成型された6体13−1を挿
入すると共に、中軸8及びリード電極軸6の一部を含む
接続構成部分の外側に前記6体13−1と同材質の予備
成型管131を嵌挿し、さらにこれを金属チューブ17
内に入れ両端の開口部をゴムシール17してスウェージ
ングマシン又はロールマシン等によシ絞り加工すること
により、同図(に)に示す如く抵抗体コイル7と中軸8
及びリード電極軸6の一部を含む接続構成部分を金属チ
ューブ12内の耐熱絶縁材13中 −に埋設固着させた
成形体とした後、同図ヒJに示す如く前記成形体の金属
チューブ12の後端部外側に金属もしくはセラミックの
スリーブ14を挿嵌し、該スリーブ14の一部14aが
金属チューブ12の後端面から突出するように配設して
、スリーブ14の内面と金属チューブ12間にガラスパ
イプ15−1を挿入し、又ガラスパイプ15−1と中軸
8との間隙にガラス粉末15−8を充填してN、雰囲気
中で加熱し、金属チューブ12の後端部及び中軸8をス
リーブ14の内腔内でガラスシールし。As shown in FIG. 5 (the same parts as in FIG. 2 are denoted by the same reference numerals), the center shaft assembly 16 described above is made by injecting magnesia or the like into the internal space of the resistor coil 7 connected to the center shaft 8 and the lead electrode shaft 6. Six bodies 13-1 preformed with heat-resistant insulating powder are inserted, and a preformed tube 131 made of the same material as the six bodies 13-1 is inserted outside the connection component including a part of the center shaft 8 and lead electrode shaft 6. Insert this into the metal tube 17.
The resistor coil 7 and the center shaft 8 are assembled as shown in FIG.
After forming a molded body by embedding and fixing the connection components including a part of the lead electrode shaft 6 in the heat-resistant insulating material 13 in the metal tube 12, the metal tube 12 of the molded body is assembled as shown in FIG. A metal or ceramic sleeve 14 is inserted on the outside of the rear end, and a part 14a of the sleeve 14 is arranged so as to protrude from the rear end surface of the metal tube 12, so that there is a gap between the inner surface of the sleeve 14 and the metal tube 12. Insert the glass pipe 15-1 into the metal tube 12, fill the gap between the glass pipe 15-1 and the center shaft 8 with glass powder 15-8, heat it in a N atmosphere, and insert the glass powder 15-8 into the rear end of the metal tube 12 and the center shaft 8. is glass-sealed within the lumen of the sleeve 14.
一体化した構造として得られるものである。It is obtained as an integrated structure.
なお前記ガラスシール加工において、スリーブ14の内
面と金属チューブ12外局間に挿入するガラスパイプは
、これを省略し、スリーブ14に金属チューブ12を直
接超音波圧入接合あるいはろう接した後スリーブ14の
内腔にガラス粉末15−1を充填し加熱してガラスシー
ル15してもよい。In the glass sealing process, the glass pipe inserted between the inner surface of the sleeve 14 and the outer part of the metal tube 12 is omitted, and after the metal tube 12 is directly ultrasonically press-fitted or soldered to the sleeve 14, the sleeve 14 is The glass powder 15-1 may be filled into the inner cavity and heated to form the glass seal 15.
なお本実施例における自己制御型グ日−プラグとしての
その他の構造は第1図に示した従来例と同様であるので
説明を省略する。The rest of the structure of the self-control type plug in this embodiment is the same as that of the conventional example shown in FIG. 1, so a description thereof will be omitted.
以上の説明から理解されるように、本発明の自己制御型
グロープラグは、取付金具内腔内における抵抗体コイル
が、金属チューブ内腔に充填された耐熱絶縁材中に中軸
及び発熱体との接続部を含め埋設されて覆われたシーズ
ヒーター構造をもつとともに、取付金具の後端開口部側
はガラスクールにより外気と完全に遮断されて一体化さ
れ、取付金具に固着された構造となっている為、極めて
強固なものとなり、優れた耐久性を有し、自己制御によ
る発熱体の過熱防止機能をもつ、従来の問題点を解決し
たセラミックグロープラグとして提供できるものである
。As can be understood from the above description, in the self-regulating glow plug of the present invention, the resistor coil in the lumen of the mounting bracket is connected to the center shaft and the heating element in the heat-resistant insulating material filled in the lumen of the metal tube. It has a sheathed heater structure that is buried and covered, including the connection part, and the opening side of the rear end of the mounting bracket is completely isolated from the outside air by a glass cooler and is integrated into a structure that is fixed to the mounting bracket. As a result, it is extremely strong, has excellent durability, and has a self-control function to prevent the heating element from overheating, and can be provided as a ceramic glow plug that solves the problems of conventional products.
第1図は自己制御型セラミックグロープラグの従来例を
示す縦断面図、第2図は本発明自己制御型セラミックグ
ロープラグの要部を示す実施例の縦断面図、第3図は、
本発明の実施例(二おける中軸組立体の製造手順説明図
である。
1:セラミックヒータ−,2:発熱線、3:金属外fl
N、4:取付金具、4a:JR座、4b:rA口部周縁
、5:キャップ、6:リード電極軸、7:抵抗体コイル
、8:中軸、9.13:耐熱絶縁材、10:絶縁体、1
1:丸ナツト、12:金属チヱープ、14ニスリーブ、
15ニガラスシール、16:中軸組立体。
代理人 弁理士 竹 内 守
第1E
第3図
(イ) (ロ)
(ハ)FIG. 1 is a longitudinal cross-sectional view showing a conventional example of a self-controlling ceramic glow plug, FIG. 2 is a longitudinal cross-sectional view of an embodiment showing main parts of the self-controlling ceramic glow plug of the present invention, and FIG.
Embodiment of the present invention (This is an explanatory diagram of the manufacturing procedure of the center shaft assembly in 2. 1: Ceramic heater, 2: Heat generating wire, 3: Metal outer fl
N, 4: Mounting bracket, 4a: JR seat, 4b: rA opening periphery, 5: Cap, 6: Lead electrode shaft, 7: Resistor coil, 8: Center shaft, 9.13: Heat-resistant insulation material, 10: Insulation body, 1
1: Round nut, 12: Metal chip, 14 Ni sleeve,
15 Nigarasu seal, 16: Central shaft assembly. Agent Patent Attorney Mamoru Takeuchi 1E Figure 3 (A) (B) (C)
Claims (1)
具の先端部に設けた発熱体に、該金具内腔内に於て電流
制御用抵抗体が直列に接続されて成る自己制御型グロー
プラグにおい′C1前記取付金具の先端部に設ける発熱
体として、セラミック粉体中に発熱線を埋設し焼結して
なるセラミックヒータ−を用い、該セラミックヒータ−
に接続される抵抗体コイルが両端を開放した金属チュー
ブ内に配され、該金属チューブの後端に突出して端子電
極となる中軸にその一端が接続されると共に、他端がヒ
ーターに接続されているリード電極軸に接続され、金属
チューブ内における上記接続構成部分は内腔内に充填さ
れた耐熱絶縁材中に埋設され固着されてな9.さらに前
記金属チューブの後端部(二はスリーブが挿嵌され、該
スリーブの一部が金属チューブの後端面から突出して前
記中軸の一部を覆うように配設され、前記スリーブ内面
と金属チューブ及び中軸の外周との間隙にガラス粉末を
充填し加熱封着してなる一体化した中軸組立体として構
成され、該組立体が取付金具の後端開口部からその内腔
に挿入され、前記スリーブの先端面を内腔内の股座に当
接係止し、スリーブの自由端を取付金具の後端部周縁で
加締め固着して成る構造としたことを特徴とする自己制
御型セラミックヒ−プラグ。A self-control glow plug, in which a current control resistor is connected in series within the inner cavity of the fitting to a heating element provided at the tip of the fitting in order to control the temperature of the heating element when energized and the temperature rises. Odor 'C1 As a heating element provided at the tip of the mounting bracket, a ceramic heater made by embedding a heating wire in ceramic powder and sintering the ceramic heater is used.
A resistor coil connected to the metal tube is arranged in a metal tube with both ends open, one end of which is connected to a center shaft that protrudes from the rear end of the metal tube and serves as a terminal electrode, and the other end is connected to a heater. 9. The connection component within the metal tube is embedded and fixed in a heat-resistant insulating material filled in the inner cavity. Furthermore, a sleeve is inserted into the rear end of the metal tube, and a part of the sleeve protrudes from the rear end surface of the metal tube to cover a part of the center shaft, and the inner surface of the sleeve and the metal tube and the outer periphery of the center shaft are filled with glass powder and heat-sealed to form an integrated center shaft assembly, and the assembly is inserted into the inner cavity of the mounting bracket from the rear end opening, and A self-controlling ceramic hip plug characterized by having a structure in which the distal end surface of the sleeve abuts and locks against the crotch seat in the inner cavity, and the free end of the sleeve is crimped and fixed around the rear end of the mounting bracket. .
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19243783A JPS6086325A (en) | 1983-10-17 | 1983-10-17 | Self-control type ceramic glow plug |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19243783A JPS6086325A (en) | 1983-10-17 | 1983-10-17 | Self-control type ceramic glow plug |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6086325A true JPS6086325A (en) | 1985-05-15 |
JPS6360290B2 JPS6360290B2 (en) | 1988-11-24 |
Family
ID=16291286
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP19243783A Granted JPS6086325A (en) | 1983-10-17 | 1983-10-17 | Self-control type ceramic glow plug |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6086325A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5059768A (en) * | 1989-09-11 | 1991-10-22 | Jidosha Kiki Co., Ltd. | Ceramic heater type glow plug |
JP2002206739A (en) * | 2000-11-13 | 2002-07-26 | Bosch Automotive Systems Corp | Ceramic glow plug and method for manufacturing the same |
-
1983
- 1983-10-17 JP JP19243783A patent/JPS6086325A/en active Granted
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5059768A (en) * | 1989-09-11 | 1991-10-22 | Jidosha Kiki Co., Ltd. | Ceramic heater type glow plug |
JP2002206739A (en) * | 2000-11-13 | 2002-07-26 | Bosch Automotive Systems Corp | Ceramic glow plug and method for manufacturing the same |
Also Published As
Publication number | Publication date |
---|---|
JPS6360290B2 (en) | 1988-11-24 |
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