JPS63297921A - Glow plug for diesel engine - Google Patents
Glow plug for diesel engineInfo
- Publication number
- JPS63297921A JPS63297921A JP13368787A JP13368787A JPS63297921A JP S63297921 A JPS63297921 A JP S63297921A JP 13368787 A JP13368787 A JP 13368787A JP 13368787 A JP13368787 A JP 13368787A JP S63297921 A JPS63297921 A JP S63297921A
- Authority
- JP
- Japan
- Prior art keywords
- holder
- glow plug
- ceramic heater
- lead
- diesel engine
- 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 claims abstract description 33
- 229910010293 ceramic material Inorganic materials 0.000 claims abstract description 9
- 239000007769 metal material Substances 0.000 claims abstract description 5
- 239000002184 metal Substances 0.000 claims description 13
- 229910052751 metal Inorganic materials 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000002485 combustion reaction Methods 0.000 claims description 8
- 230000002093 peripheral effect Effects 0.000 claims description 7
- 239000004020 conductor Substances 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 3
- 239000010935 stainless steel Substances 0.000 abstract description 3
- 239000011521 glass Substances 0.000 abstract description 2
- 238000005304 joining Methods 0.000 abstract description 2
- 239000000155 melt Substances 0.000 abstract description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 abstract 2
- 239000011230 binding agent Substances 0.000 abstract 2
- 229910052709 silver Inorganic materials 0.000 abstract 2
- 239000004332 silver Substances 0.000 abstract 2
- 238000009736 wetting Methods 0.000 abstract 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 229910000679 solder Inorganic materials 0.000 description 3
- 229910052581 Si3N4 Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- UPHIPHFJVNKLMR-UHFFFAOYSA-N chromium iron Chemical compound [Cr].[Fe] UPHIPHFJVNKLMR-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000009760 electrical discharge machining Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はディーゼルエンジンの副燃焼室または燃焼室内
の予熱に使用するグロープラグに関し。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a glow plug used for preheating the auxiliary combustion chamber or combustion chamber of a diesel engine.
特に速熱型の機能を有し、かつ長時間のアフターグロー
化を達成し得る自己飽和性を有するセラミ・２クヒータ
を備えたディーゼルエンジン用グロープラグの改良に関
するものである。In particular, the present invention relates to an improvement of a glow plug for a diesel engine equipped with a ceramic double heater that has a fast heating function and a self-saturating property that can achieve long-term afterglow.
一般にディーゼルエンジンは低温時の始動性が悪いため
、副燃焼室または燃焼室内にグロープラグを設置し１通
電発熱により、吸気温度の上昇または着火源用として、
エンジンの始動性を向上させる方法を採用している。こ
の種のグロープラグとしては、従来金属製シース内に耐
熱絶縁粉末を充填し、鉄クロム、ニッケル等からなるコ
イル状発熱線を埋設した。いわゆるシース型と称するも
のが一般的である。またそれ以外にも特開昭５７−４１
５２３号公報等に示されるように、タングステン等によ
る発熱等を、絶縁性を有する窒化ケイ素等のセラミック
材中に埋設した棒状ヒータを使用したセラミックヒータ
型も知られている。このようなセラミックヒータ型は、
耐熱絶縁粉末およびシースを介して間接加熱するシース
型に比べ、熱伝達効率を向上させ得ると共に１発熱特性
の面でも優れ、加熱時に短時間で赤熱して温度立ち上が
り特性を大幅に向上させ、速熱型の性能を有するため、
近年盛んに採用されるようになっている。Diesel engines generally have poor startability at low temperatures, so a glow plug is installed in the auxiliary combustion chamber or combustion chamber to generate heat when energized, raising the intake air temperature or as an ignition source.
A method is used to improve engine startability. Conventionally, this kind of glow plug has a metal sheath filled with heat-resistant insulating powder and a coiled heating wire made of iron chromium, nickel, etc. buried therein. The so-called sheath type is common. In addition, there are also JP-A-57-41
As shown in Japanese Patent No. 523, etc., a ceramic heater type using a rod-shaped heater in which heat generated by tungsten or the like is embedded in an insulating ceramic material such as silicon nitride is also known. This type of ceramic heater is
Compared to the sheath type, which heats indirectly through heat-resistant insulating powder and a sheath, it improves heat transfer efficiency and also has superior heat generation characteristics. Because it has thermal type performance,
It has been widely adopted in recent years.
しかしながら、上記セラミックヒータ型のグロープラグ
は２例えば窒化ケイ素のような絶縁性セラミック材の内
部に、タングステン等の金属製発熱線を埋設した構造で
あり、しかもこれら両部材間の熱膨張率が異なるため、
特に発熱時における急激な）ユ度上昇とその繰り返し使
用とが、セラミックヒータの耐久性を減するおそれがあ
る。従って耐熱強度等の信頼性の面で問題があり、さら
にコスト高を招くという欠点があった。However, the ceramic heater type glow plug described above has a structure in which a heating wire made of metal such as tungsten is embedded inside an insulating ceramic material such as silicon nitride, and the coefficient of thermal expansion between these two materials is different. For,
There is a risk that the durability of the ceramic heater may be reduced, especially due to the rapid increase in temperature during heat generation and its repeated use. Therefore, there is a problem in terms of reliability such as heat resistance strength, and there is also a drawback that the cost is increased.
上記問題点を解消するものとして２発熱線を絶縁性セラ
ミック材と略々間等の熱膨張率を有する導電性セラミッ
ク材で形成したセラミックヒータ構造が１例えば特開昭
６０−９０８５号公報や、同６〇−１４７８４号公報等
により提案されている。しかしいずれもグロープラグと
して使用するには、構造上および機能面からも未だ問題
があり、実用化するには至っていない。To solve the above problems, there is a ceramic heater structure in which the heating wire is made of a conductive ceramic material having a coefficient of thermal expansion approximately equal to that of an insulating ceramic material. This method has been proposed in Publication No. 60-14784. However, both of them still have structural and functional problems when used as glow plugs, and have not been put into practical use.
すなわち速熱型としての機能が不充分、成形加工が煩雑
、電極の取り出し構造が複雑、アフターグロ一時間の長
時間化が困難等の問題点がある。That is, there are problems such as insufficient function as a rapid heating type, complicated molding process, complicated electrode extraction structure, and difficulty in extending the afterglow time.
上記の問題点を解決するために１本出願人はＵ字状に形
成した導電性セラミック材からなるセラミックヒータを
中空状ホルダ内に接合保持したディーゼルエンジン用グ
ロープラグについての発明をすでに出願している（特願
昭６０−２９９３３８号、同６０−２９９３３９号、同
６１−２５６３５４号、同６１−２５６３５５号。In order to solve the above problems, the applicant has already filed an invention for a glow plug for diesel engines in which a U-shaped ceramic heater made of conductive ceramic material is bonded and held in a hollow holder. (Patent Application No. 60-299338, No. 60-299339, No. 61-256354, No. 61-256355.
同６２−３２６４３号等）、これらの発明により上記従
来技術に存在する問題点を解決することができたが、ホ
ルダとセラミックヒータとの接合保持部分において１部
材相互間の熱膨張係数の相違による熱応力に起因する割
れの発生があり、また接合材との濡れ性不充分に起因す
る接合不良等があり。62-32643, etc.), these inventions were able to solve the problems existing in the above-mentioned prior art. Cracks may occur due to thermal stress, and bonding defects may occur due to insufficient wettability with the bonding material.
未だ若干の改良を要する問題点がある。There are still problems that require some improvement.
本発明は上記の問題点を解決し、上記発明の完全化を図
り、信頼性の高いディーゼルエンジン用グロープラグを
提案することを目的とする。The object of the present invention is to solve the above-mentioned problems, perfect the above-mentioned invention, and propose a highly reliable glow plug for diesel engines.
上記問題点解決のために１本発明においては。 One aspect of the present invention is to solve the above problems.
Ａ、一端を外部に突出させた状態で中空状ホルダの先端
部にセラミックヒータを保持する。A. A ceramic heater is held at the tip of a hollow holder with one end protruding to the outside.
Ｂ、このセラミックヒータをＵ字状発熱部とこのＵ字状
発熱部の両端部から後方に延設した一対のリード部とを
導電性セラミック材によって一体に構成する。B. In this ceramic heater, a U-shaped heat generating section and a pair of lead sections extending rearward from both ends of the U-shaped heat generating section are integrally constructed using a conductive ceramic material.
Ｃ９少なくとも前記一方のリード部外周面に絶縁層およ
びメタライズ層を順次形成する。C9: An insulating layer and a metallized layer are sequentially formed on the outer peripheral surface of at least one of the lead parts.
Ｄ、金属材料からなる接合材を介して前記ホルダ内に接
合保持する。D. Bonded and held within the holder via a bonding material made of a metal material.
Ｅ、少なくとも前記一方のリード部後端部を金属 −Ｒ
綿を介して前記ホルダ後端部に絶縁状態で保持した外部
接続端子と接続する。E, at least the rear end of one of the leads is made of metal -R
It is connected to an external connection terminal held in an insulated state at the rear end of the holder via cotton.
という技術的手段を採用したのである。This technical method was adopted.
図は本発明の実施例を示す要部縦断面図である。 The figure is a longitudinal sectional view of a main part showing an embodiment of the present invention.
同図において全体を符号１０で示すグロープラグの概略
構成を説明する。グロープラグ１０は、先端側が発熱体
として機能する棒状のセラミックヒータｌｌと、このセ
ラミックヒータ１１を先端において保持する略管状を呈
する例えばステンレス鋼等の金属製のホルダ１２を有す
る。ホルダ１２の外周にはねじ部１２ａを形成し、エン
ジンのシリンダヘッド側のねし穴（図示せず）と螺合し
。A schematic structure of a glow plug, which is generally designated by the reference numeral 10 in the figure, will be explained. The glow plug 10 has a rod-shaped ceramic heater 11 whose distal end functions as a heating element, and a substantially tubular holder 12 made of metal such as stainless steel, which holds the ceramic heater 11 at its distal end. A threaded portion 12a is formed on the outer periphery of the holder 12, and is screwed into a tapped hole (not shown) on the cylinder head side of the engine.
セラミックヒータ１１の先端を燃焼室若しくは副燃焼室
内に突出させた状態で保持する。ホルダ１２の後端部に
は第１および第２の外部接続端子１３．１４を３合成樹
脂その他の絶縁材料内に貫通埋設してなる端子組立体１
５を嵌込み支持すると共に、各端子１３．１４と前記セ
ラミックヒータ１１を構成するリード部２１．２２とは
１例えばフレキシブルワイヤ等の金属導線１６．１７お
よびターミナルキャンプ２８．２９を介して接続する。The tip of the ceramic heater 11 is held in a state in which it projects into the combustion chamber or the auxiliary combustion chamber. At the rear end of the holder 12 is a terminal assembly 1 in which first and second external connection terminals 13 and 14 are penetrated and embedded in a synthetic resin or other insulating material.
Each terminal 13.14 and the lead portion 21.22 constituting the ceramic heater 11 are connected via a metal conducting wire 16.17 such as a flexible wire and a terminal camp 28.29. .
次に前記端子組立体１５は、その軸線上に配設し前記金
属導線１６と接続すべきロンド部１３ａをその内方端側
に存する第１の外部接続端子１３と、その周囲に所定間
隔を置いて配設しかつその内方端側の一部に延設したリ
ード片１４ａを前記金属導線１７と接続する筒状の第２
の外部接続端子１４と、上記接続両端子１３．１４問お
よび外周部を絶縁するように一体化する樹脂モールドに
よる組立体本体ｔＳａを有すると共に２組立体本体１５
ａの外周には連結補強用の金属管１５ｂを嵌装する。そ
してこの金属管１５ｂをホルダ１２の後端部開口周縁部
分において高加圧力を介してかしめ付け、軸線方向に沿
って座屈変形させることにより、その内側が樹脂製の組
立体本体１５ａ側に、外側がホルダ１２の内壁に強固に
圧接された状態となり、外力若しくは熱収縮による問題
を解消し得るように構成する。Next, the terminal assembly 15 connects the first external connection terminal 13, which is located on the inner end of the terminal assembly 15, with the rond part 13a, which is disposed on its axis and is to be connected to the metal conductive wire 16, and the first external connection terminal 13, which is located on the inner end side thereof, and a predetermined interval around the first external connection terminal 13. A cylindrical second lead piece 14a, which is arranged at the same position and extends to a part of the inner end side, is connected to the metal conductive wire 17.
It has an assembly main body tSa made of a resin mold that integrates the external connection terminal 14, both connection terminals 13 and 14 and the outer peripheral part so as to insulate the two assembly main bodies 15.
A metal tube 15b for connection reinforcement is fitted around the outer periphery of a. Then, this metal tube 15b is caulked at the peripheral edge of the opening at the rear end of the holder 12 using a high pressure force, and is buckled and deformed along the axial direction, so that the inner side thereof is made of resin and is attached to the assembly main body 15a. The outer side is firmly pressed against the inner wall of the holder 12, and the structure is such that problems caused by external force or thermal contraction can be solved.
更に１８ａ、１８ｂは各々絶縁リングおよびワッシャで
あり、ホルダ１２の後方に突出する第２の外部接続端子
１４に嵌装するｅ ｔ８ｃは絶縁部材であり、前記ワ
ッシャ１８ｂの外方端側において前記第１の外部接続端
子１３側に嵌装する。また１８ｄ、１８ｅは各々スプリ
ングワッシャおよび締付用ナツトであり、前記第１の外
部接続端子１３の外方端側に形成したねじ部に嵌装およ
び螺合する。そして前記ワッシャ１８ｂと絶縁部材１８
Ｃとの間、および絶縁部材１８Ｃとスプリングワッシャ
１８ｄとの間に各々バッテリからのリード線（図示せず
）を介装挟持することにより、前記各外部接続端子１３
．１４をバッテリと電気的に接続する。ｉ６ａ、１７ａ
は各々前記金属導線１６．１７に被覆したチューブ等の
絶縁部材である。Further, 18a and 18b are an insulating ring and a washer, respectively, and 8c is an insulating member fitted into the second external connection terminal 14 protruding rearward of the holder 12, and the outer end of the washer 18b is connected to the second external connection terminal 14. 1 on the external connection terminal 13 side. Further, 18d and 18e are a spring washer and a tightening nut, respectively, which are fitted and screwed into a threaded portion formed on the outer end side of the first external connection terminal 13. The washer 18b and the insulating member 18
C, and between the insulating member 18C and the spring washer 18d, lead wires (not shown) from the battery are interposed between the external connection terminals 13 and
．． 14 is electrically connected to the battery. i6a, 17a
are insulating members such as tubes covering the metal conductive wires 16 and 17, respectively.
セラミックヒータ１１は２例えば導電性サイアロン粉末
を熱可塑性樹脂等と混練し、所定のキャビティを有する
金型中に射出成形し、この成形体を焼成して形成するか
、若しくは予め棒状に成形した素材を放電加工や切削加
工によって所定の形状に成形することができる。そして
発熱部２０はリード部２１．２２よりも肉厚が薄くなる
よう小径に形成すると共に、セラミックヒータ１１の中
央部には１発熱部２０からリード部２１．２２間にかけ
て長手方向にスリット２５を形成する。なおリード部２
１．２２の外周面には絶縁層２３゜２４を設ける。The ceramic heater 11 is formed by, for example, kneading conductive sialon powder with a thermoplastic resin or the like, injection molding it into a mold having a predetermined cavity, and firing the molded body, or by forming the material into a rod shape in advance. can be formed into a predetermined shape by electrical discharge machining or cutting. The heat generating part 20 is formed to have a small diameter so as to be thinner than the lead parts 21.22, and a slit 25 is formed in the center of the ceramic heater 11 in the longitudinal direction from the first heat generating part 20 to the lead parts 21.22. Form. Note that lead part 2
Insulating layers 23 and 24 are provided on the outer peripheral surface of 1.22.
なお３０は密閉用シートであり、ゴム、アスベスト等か
らなり、ホルダ１２の後端部開口部分で第１および第２
の外部接続端子１３．１４を存する端子組立体１５の外
方端側に介装させて、この部分を機械的にシールする構
成とする。なお前記スリット２５を形成するリード２１
．２２間に。The sealing sheet 30 is made of rubber, asbestos, etc.
The external connection terminals 13 and 14 are interposed on the outer end side of the terminal assembly 15, and this part is mechanically sealed. Note that the lead 21 forming the slit 25
．． Between 22 and 22.
例えば絶縁性セラミック材によって形成した絶縁シート
を、少なくともホルダ１２先端部に対応する部分におい
てそれらと一体に接合させるとよい。For example, an insulating sheet formed of an insulating ceramic material may be integrally joined to the holder 12 at least in a portion corresponding to the tip end thereof.
このように構成することにより、スリット２５をホルダ
１２の先端部で閉塞密閉し、エンジンの燃焼圧の外部漏
洩を防止できるのである。また上記の構成により、セラ
ミックヒータ１１のホルダ１２に保持される後端部分の
機械的強度を向上させ得る。With this configuration, the slit 25 can be closed and sealed at the tip of the holder 12 to prevent the combustion pressure of the engine from leaking to the outside. Further, with the above configuration, the mechanical strength of the rear end portion of the ceramic heater 11 held by the holder 12 can be improved.
以上のようにしてセラミックヒータ１１全体を５１１Ｉ
ｌφＸ５（１ｍ１ｍ、発熱部２０を３ｍｓ＋φＸ１０ｍ
５＋に形成してグロープラグ１０として組立てて実験し
たところ、８００℃到達時間３．５秒、飽和温度をその
許容範囲ｔ−１２００℃以下とした上で約１１００℃と
し得る性能を確認した。As described above, the entire ceramic heater 11 is
lφX5 (1m1m, heat generating part 20 3ms+φX10m
5+ and assembled as glow plug 10, it was confirmed that it took 3.5 seconds to reach 800°C and the saturation temperature could be set to about 1100°C with the permissible range t-1200°C or less.
次に上記セラミックヒータ１１とホルダ１２との接合に
ついて記述する。両者の接合に際しては。Next, the connection between the ceramic heater 11 and the holder 12 will be described. When joining the two.
例えば恨ろうのような溶融金属材料を使用するのが最も
一般的であるが、セラミックヒータ１１のリード部２１
．２２の外周面には１例えばガラスのような絶縁材料か
らなる絶縁層２３．２４を設けであるため１ｍろうとの
濡れ性不充分による接合不良等が発生することがあり、
気密性を阻害する不都合がある。本発明においては、上
記濡れ性改善のために絶縁層２３．２４の外周面にメタ
ライズ層を形成する。メタライズ層を形成する材料とし
てＡｇ−ＰｄペーストＮｉペースト、Ｎｉメンキ、Ａｇ
ペースト、Ｎ１メッキおよびＡｇペーストの５種を選び
、 ７５０”〜８５０℃にて焼付け。For example, it is most common to use a molten metal material such as wax, but the lead portion 21 of the ceramic heater 11
．． Since insulating layers 23 and 24 made of an insulating material such as glass are provided on the outer peripheral surface of 22, bonding defects may occur due to insufficient wettability with a 1 m solder.
This has the disadvantage of impeding airtightness. In the present invention, a metallized layer is formed on the outer peripheral surface of the insulating layers 23 and 24 in order to improve the wettability. Ag-Pd paste Ni paste, Ni coating, Ag
We selected five types: paste, N1 plating, and Ag paste, and baked them at 750'' to 850℃.
５〜２０μｍのメタライズ層を形成した後３図に示すよ
うなグロープラグ１０として組み立てた。After forming a metallized layer of 5 to 20 μm, a glow plug 10 as shown in FIG. 3 was assembled.
この場合ホルダ１２は例えばステンレス鋼を使用し、セ
ラミックヒータ１１との間には銀ろうを使用して接合固
着した。In this case, the holder 12 is made of stainless steel, for example, and is bonded and fixed to the ceramic heater 11 using silver solder.
表は上記グロープラグ１０の気密性テストの結果を示す
ものであり、ＩＯ気圧を印加した水中浸漬により、夫々
１０個の試料について行ったものである。The table shows the results of the airtightness test of the glow plug 10, which was conducted on 10 samples each by immersion in water to which IO atmospheric pressure was applied.
以下余白
表から明らかなように、メタライズ層を形成しないもの
においては、ホルダ１２は格別としてセラミックヒータ
１１のリード部２１．２２に設けた絶縁層２３．２４と
接合材である恨ろうとの濡れ性が不充分であるため、接
合が完全に行われず。As is clear from the margin table below, in the case where a metallized layer is not formed, the holder 12 has a special wettability with the insulating layers 23 and 24 provided on the lead portions 21 and 22 of the ceramic heater 11 and the bonding material wax. Since the bonding is insufficient, the bonding is not completed completely.
従って気密性を確保することができない。これに対して
本発明によるメタライズ層を設けたものにおいては、恨
ろうとの濡れ性が確保されるため。Therefore, airtightness cannot be ensured. On the other hand, in the case where the metallized layer according to the present invention is provided, wettability with respect to the wax is ensured.
接合状態が良好であり、就中Ａｇ−Ｐｄペーストおよび
Ｎｉペーストによってメタライズ層を形成したものにお
いては、気密性が完全であることが認められる。It was observed that the bonding state was good, and that the airtightness was perfect, especially in those in which the metallized layer was formed using Ag-Pd paste and Ni paste.
本実施例においては、セラミックヒータ１１をホルダ１
２の先端部に保持させた状態で接合固定するために、リ
ード部２１．２２の外周面に各々絶縁層２３．２４を形
成する例を示したが、一方のリード部例えば２１にメタ
ライズ層のような導電層を設けてホルダ１２と電気的に
接続し、金属導線を他方のリード部例えば２２にのみ接
続する構成としてもよい、また本発明は前記実施例の構
造に限定されず、各部の形状、構造等を適宜変形。In this embodiment, the ceramic heater 11 is mounted on the holder 1.
In order to bond and fix the lead parts 21 and 22 in a state where they are held at the tips of the lead parts 21 and 22, an example is shown in which the insulating layers 23 and 24 are formed on the outer circumferential surfaces of the lead parts 21 and 22, respectively. It is also possible to provide a structure in which a conductive layer is provided to electrically connect to the holder 12, and a metal conductor is connected only to the other lead part, for example, 22.The present invention is not limited to the structure of the above embodiment, and the structure of each part may be Change the shape, structure, etc. as appropriate.
変更することは自由であり１例えばセラミックヒータ１
１は横断面円形以外に、矩形、正方形、多角形、楕円等
の形状としても作用は同一である。You are free to change 1.For example, ceramic heater 1.
1 may have a rectangular, square, polygonal, elliptical, etc. shape in addition to a circular cross section, and the effect is the same.
更に少なくとも一方のリード部とホルダとの間に介在さ
せる接合材としては、銀ろうのような溶融接合材の他に
１例えば拡散接合材のような固体接合材の使用も可能で
あり、ホルダを形成する金属材料との対応により、適宜
選定可能である。Furthermore, as the bonding material interposed between at least one lead part and the holder, in addition to a melt bonding material such as silver solder, it is also possible to use a solid bonding material such as a diffusion bonding material. It can be selected as appropriate depending on the metal material to be formed.
本発明のディーゼルエンジン用グロープラグは。 The glow plug for a diesel engine of the present invention is a glow plug for a diesel engine.
以上記述のような構成であるから、下記の効果を奏する
ことができる。With the configuration as described above, the following effects can be achieved.
（１）簡単な構造であるにも拘らず２発熱部がヒータ外
周面に露出しているから、従来型に比べて迅速かつ確実
な先端赤熱化を達成し、速熱型としての機能を発揮でき
る。(1) Despite the simple structure, the two heat-generating parts are exposed on the outer circumferential surface of the heater, so the tip becomes red hot more quickly and reliably than conventional types, demonstrating the function of a fast-heating type. can.
（２）発熱部およびリード部を形成する導電性セラミッ
クスを同一材料で形成するため１ ヒータ発熱時におけ
る急激な温度上昇によってもワレ等の事故を発生せず、
耐熱強度等の信転性を確保し得る。(2) Because the conductive ceramics that form the heat generating part and the lead part are made of the same material, 1. Accidents such as cracking will not occur even when the temperature rises rapidly when the heater generates heat.
It can ensure reliability such as heat resistance strength.
（３）先端発熱部の熱容量が小さいため自己温度飽和性
を有し、その結果エンジンの排気、騒音対策としての長
時間のアフターグローが容易とな・る。(3) Since the heat capacity of the heat generating part at the tip is small, it has self-temperature saturation, and as a result, long-term afterglow as a measure against engine exhaust and noise becomes easy.
（４）全体の構造が簡単であるため、成形加工、ｍ立が
容易であり、生産性が橿めて高い。(4) Since the overall structure is simple, molding and machining are easy, and productivity is extremely high.
（５） セラミックヒータと接合材との間の濡れ性を
充分確保することができるため、気密性を完全にするこ
とができ、信鎖性を飛躍的に向上させ得る。(5) Since sufficient wettability between the ceramic heater and the bonding material can be ensured, airtightness can be made perfect and reliability can be dramatically improved.
図は本発明の実施例を示す要部縦断面図である。
ｌｌ：セラミックヒータ、１２：ホルダ。
２０：発熱部、２１．２２：リード部、２３゜２４：絶
縁層。The figure is a longitudinal sectional view of a main part showing an embodiment of the present invention. ll: ceramic heater, 12: holder. 20: Heat generating part, 21.22: Lead part, 23°24: Insulating layer.
Claims (6)
先端部にセラミックヒータを保持し、このセラミックヒ
ータをＵ字状発熱部とこのＵ字状発熱部の両端部から後
方に延設した一対のリード部とを導電性セラミック材に
よって一体に構成し、少なくとも前記一方のリード部外
周面に絶縁層およびメタライズ層を順次形成し、金属材
料からなる接合材を介して前記ホルダ内に接合保持する
と共に、少なくとも前記一方のリード部後端部を金属導
線を介して前記ホルダ後端部に絶縁状態で保持した外部
接続端子と接続したことを特徴とするディーゼルエンジ
ン用グロープラグ。(1) A ceramic heater is held at the tip of a hollow holder with one end protruding outside, and this ceramic heater is installed rearward from a U-shaped heating section and both ends of this U-shaped heating section. A pair of lead parts are integrally constructed of a conductive ceramic material, an insulating layer and a metallized layer are sequentially formed on the outer peripheral surface of at least one of the lead parts, and the lead parts are bonded and held in the holder via a bonding material made of a metal material. A glow plug for a diesel engine, wherein the rear end of at least one of the leads is connected via a metal conductive wire to an external connection terminal held in an insulated state at the rear end of the holder.
厚寸法をリード部の肉厚寸法より小さく形成した特許請
求の範囲第１項記載のディーゼルエンジン用グロープラ
グ。(2) A glow plug for a diesel engine according to claim 1, wherein the wall thickness of the U-shaped heat generating portion constituting the ceramic heater is formed to be smaller than the wall thickness of the lead portion.
対応する部分の一対のリード部間に、燃焼圧をシールす
る絶縁シートを一体的に介装した特許請求の範囲第１項
若しくは第２項記載のディーゼルエンジン用グロープラ
グ。(3) The diesel according to claim 1 or 2, wherein an insulating sheet for sealing combustion pressure is integrally interposed between a pair of lead portions of at least a portion of the ceramic heater corresponding to the holder tip portion. Glow plug for engine.
的に接続すると共に、他方のリード部とホルダ後端部に
保持した外部接続端子とを金属導線を介して接続した特
許請求の範囲第１項ないし第３項何れかに記載のディー
ゼルエンジン用グロープラグ。(4) A claim in which one lead part is electrically connected to the holder via a conductive layer, and the other lead part and an external connection terminal held at the rear end of the holder are connected via a metal conductor wire. The glow plug for a diesel engine according to any one of items 1 to 3.
て形成した特許請求の範囲第１項ないし第４項何れかに
記載のディーゼルエンジン用グロープラグ。(5) A glow plug for a diesel engine according to any one of claims 1 to 4, wherein the metallized layer is formed by baking Ag-Pd paste.
した特許請求の範囲第１項ないし第４項何れかに記載の
ディーゼルエンジン用グロープラグ。(6) A glow plug for a diesel engine according to any one of claims 1 to 4, wherein the metallized layer is formed by baking Ni paste.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13368787A JPS63297921A (en) | 1987-05-29 | 1987-05-29 | Glow plug for diesel engine |
| DE3817843A DE3817843A1 (en) | 1987-05-29 | 1988-05-26 | GLOW PLUG FOR DIESEL ENGINES |
| US07/199,629 US4931619A (en) | 1987-05-29 | 1988-05-27 | Glow plug for diesel engines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13368787A JPS63297921A (en) | 1987-05-29 | 1987-05-29 | Glow plug for diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63297921A true JPS63297921A (en) | 1988-12-05 |
Family
ID=15110530
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13368787A Pending JPS63297921A (en) | 1987-05-29 | 1987-05-29 | Glow plug for diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63297921A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010035687A1 (en) * | 2008-09-26 | 2010-04-01 | 京セラ株式会社 | Ceramic heater |
-
1987
- 1987-05-29 JP JP13368787A patent/JPS63297921A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010035687A1 (en) * | 2008-09-26 | 2010-04-01 | 京セラ株式会社 | Ceramic heater |
| JP2010080257A (en) * | 2008-09-26 | 2010-04-08 | Kyocera Corp | Ceramic heater |
| KR20110065472A (en) * | 2008-09-26 | 2011-06-15 | 쿄세라 코포레이션 | Ceramic heater |
| CN102165841A (en) * | 2008-09-26 | 2011-08-24 | 京瓷株式会社 | Ceramic heater |
| US8471179B2 (en) | 2008-09-26 | 2013-06-25 | Kyocera Corporation | Ceramic heater |
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