JPS6365234A - Ceramic glow plug - Google Patents
Ceramic glow plugInfo
- Publication number
- JPS6365234A JPS6365234A JP20996886A JP20996886A JPS6365234A JP S6365234 A JPS6365234 A JP S6365234A JP 20996886 A JP20996886 A JP 20996886A JP 20996886 A JP20996886 A JP 20996886A JP S6365234 A JPS6365234 A JP S6365234A
- Authority
- JP
- Japan
- Prior art keywords
- ceramic
- ceramic heater
- diameter part
- brazing
- large diameter
- 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
- 239000000919 ceramic Substances 0.000 title claims abstract description 33
- 238000002485 combustion reaction Methods 0.000 claims abstract description 6
- 239000002184 metal Substances 0.000 claims description 23
- 229910052575 non-oxide ceramic Inorganic materials 0.000 claims description 4
- 239000011225 non-oxide ceramic Substances 0.000 claims description 3
- 238000005219 brazing Methods 0.000 abstract description 5
- 229910010293 ceramic material Inorganic materials 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract description 2
- 229910052581 Si3N4 Inorganic materials 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
産業上の利用分野二本発明は主としてディーゼルエンジ
ンの始動補助装置として使用されるセラミックグロープ
ラグに関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a ceramic glow plug used primarily as a starting aid for diesel engines.
従来の技術二発熱素子として抵抗体を内蔵したセラミッ
クヒータ−は耐熱性にすぐれているが脆いという弱点が
あり、第3図に示すように主体金具1と接合部で折れ易
く、該セラミックヒータ−2は先ず金属外筒3に鑞付は
接合し、この金属外筒3をさらに主体金具1の内腔に鑞
付は接合して金属外筒を主体金具端面から突出させた状
態で一体とし、グロープラグを形成するもので、主体金
具1のネジ部4でシリンダーヘッドに螺着する構造にな
っている。Conventional Technology 2 Ceramic heaters with a built-in resistor as a heat generating element have excellent heat resistance, but have the disadvantage of being brittle, and as shown in FIG. First, the metal outer cylinder 3 is brazed and joined to the metal outer cylinder 3, and the metal outer cylinder 3 is further brazed and joined to the inner cavity of the metal shell 1, so that the metal outer cylinder is integrated with the metal outer cylinder in a state that it protrudes from the end surface of the metal shell. It forms a glow plug, and has a structure in which it is screwed onto the cylinder head using the threaded portion 4 of the metal shell 1.
発明が解決しようとする問題点二上記のごとくセラミッ
クヒータ−2は脆い弱点があるため、金属外筒3で補強
されているが、金属外筒3はセラミック材に比し耐熱性
が低いので、エンジンの燃焼温度が高(950’C以上
になると金属外筒3の先端部が著しく酸化消耗し、或は
溶損金起し、セラミックヒータ−の強度を補強する能力
を失い、結局セラミックヒータ一部の破損に至り、グロ
ープラグの寿命を短命化する欠点があった。Problem 2 to be Solved by the Invention As mentioned above, the ceramic heater 2 has a weak point of brittleness, so it is reinforced with a metal outer cylinder 3, but the metal outer cylinder 3 has lower heat resistance than a ceramic material. When the combustion temperature of the engine is high (over 950'C), the tip of the metal outer cylinder 3 will be severely oxidized and worn out, or metal will melt and lose its ability to reinforce the strength of the ceramic heater. This has the drawback of shortening the lifespan of the glow plug, leading to damage.
問題点を解決するための手段二本発明は上記従来例及び
実施例のごとくセラミックヒータ−の金属外筒を介して
主体金具に鑞付は接合する構成をとることなく、セラミ
ックヒータ−を313N4 。Second Means for Solving the Problems The present invention does not employ a configuration in which the metal shell of the ceramic heater is joined to the metal shell via the metal outer cylinder as in the conventional examples and embodiments described above, but instead uses a ceramic heater of 313N4.
SiCのごとき非酸化物系のセラミック材で、径大部と
先端側の径小部とに段部を介して一体に連成し、該径大
部を主体金具内腔に鑞付けして成るもので、主体金具端
面から径大部が燃焼室間に突出することになる。第1図
は実施例の断面図で、2aはセラミックヒータ−2の径
小部、2bは仝じく径大部を示す。第2図は別の実施例
の縦断面図で径大部は発熱素子を内蔵した径小のセラミ
ックヒータ−2に同材質又は同系の非酸化物系セラミッ
ク外筒5を鑞付け12接合して成り、セラミックヒータ
−2の導通取シ出しのため主体金具1の内腔に内蔵され
て該セラミックヒータ−2と接合された金属外筒6と前
記セラミック外筒5とはその端面で鑞付け14接合され
、両外筒はともに主体金具1の内腔に鑞付は接合される
。なお7はレジスター、8はシール材、9は絶縁体、1
0は端子ナツト、11は中軸を示す。Made of non-oxide ceramic material such as SiC, the large-diameter part and the small-diameter part on the tip side are integrally connected via a stepped part, and the large-diameter part is brazed to the inner cavity of the metal shell. As a result, the large-diameter portion protrudes between the combustion chambers from the end surface of the metal shell. FIG. 1 is a sectional view of the embodiment, in which 2a indicates a small diameter portion of the ceramic heater 2, and 2b indicates a large diameter portion. FIG. 2 is a longitudinal cross-sectional view of another embodiment, in which a large-diameter part is a small-diameter ceramic heater 2 with a built-in heating element, and a non-oxide ceramic outer cylinder 5 made of the same material or the same type is joined by soldering 12. The ceramic outer cylinder 5 and the metal outer cylinder 6, which is built into the inner cavity of the metal shell 1 and joined to the ceramic heater 2 in order to provide electrical continuity to the ceramic heater 2, are brazed 14 at their end faces. Both outer cylinders are joined to the inner cavity of the metal shell 1 by brazing. Note that 7 is a resistor, 8 is a sealing material, 9 is an insulator, 1
0 indicates the terminal nut, and 11 indicates the center shaft.
作用及び効果:本発明の構成では、燃焼温度の高いエン
ジンに対して径大部或はセラミック外筒部が燃焼室内に
突出状態におかれても該径大部やセラミック外筒部は焼
損することなく、セラミックヒータ一部の強度補強は充
分に確保される。第2図に示す両絶縁型セラミックグロ
ープラグでレジスタ一部分7を除いた接地型セラミック
グロープラグにも本発明のセラミックヒータ−は適用可
能である。Effects and effects: With the configuration of the present invention, even if the large-diameter portion or the ceramic outer cylinder portion is placed in a state of protruding into the combustion chamber in an engine with a high combustion temperature, the large-diameter portion or the ceramic outer cylinder portion will not be burned out. The strength of a portion of the ceramic heater can be sufficiently reinforced without this. The ceramic heater of the present invention can also be applied to the grounded type ceramic glow plug shown in FIG. 2, in which the resistor portion 7 is removed.
第1図は本発明のセラミックグロープラグの縦断面図、
第2図は仝じく別の実施例の縦断面図、第3図は従来の
セラミックグロープラグの縦断面図である。
1・・・主体金具 2・・・セラミックヒータ−2a・
・・径小部 2b・・・径大部 5・・・セラミック外
筒6・・・内蔵された金属外筒FIG. 1 is a longitudinal sectional view of the ceramic glow plug of the present invention.
FIG. 2 is a vertical cross-sectional view of another embodiment, and FIG. 3 is a vertical cross-sectional view of a conventional ceramic glow plug. 1... Metal shell 2... Ceramic heater-2a.
...Small diameter part 2b...Large diameter part 5...Ceramic outer tube 6...Built-in metal outer tube
Claims (2)
ら成る非酸化物系のセラミックヒーターの該径大部が直
接エンジン燃焼室内に突出するようこれを主体金具内腔
に接合したセラミックグロープラグ。(1) A non-oxide ceramic heater consisting of a small-diameter part on the tip side and a large-diameter part connected via a stepped part is installed in the inner cavity of the metal shell so that the large-diameter part projects directly into the engine combustion chamber. Bonded ceramic glow plug.
前記径小部に接合して成ることを特徴とする特許請求の
範囲第1項記載のセラミックグロープラグ。(2) The ceramic glow plug according to claim 1, wherein the large diameter portion is formed by joining a separate non-oxide ceramic cylinder to the small diameter portion.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20996886A JPS6365234A (en) | 1986-09-05 | 1986-09-05 | Ceramic glow plug |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20996886A JPS6365234A (en) | 1986-09-05 | 1986-09-05 | Ceramic glow plug |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6365234A true JPS6365234A (en) | 1988-03-23 |
Family
ID=16581662
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP20996886A Pending JPS6365234A (en) | 1986-09-05 | 1986-09-05 | Ceramic glow plug |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6365234A (en) |
-
1986
- 1986-09-05 JP JP20996886A patent/JPS6365234A/en active Pending
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