JPS6347964B2 - - Google Patents
Info
- Publication number
- JPS6347964B2 JPS6347964B2 JP17320783A JP17320783A JPS6347964B2 JP S6347964 B2 JPS6347964 B2 JP S6347964B2 JP 17320783 A JP17320783 A JP 17320783A JP 17320783 A JP17320783 A JP 17320783A JP S6347964 B2 JPS6347964 B2 JP S6347964B2
- Authority
- JP
- Japan
- Prior art keywords
- ceramic
- heater
- outer cylinder
- temperature
- heating wire
- 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
Links
- 239000000919 ceramic Substances 0.000 claims description 47
- 238000010438 heat treatment Methods 0.000 claims description 42
- 239000002184 metal Substances 0.000 claims description 23
- 229910052751 metal Inorganic materials 0.000 claims description 23
- 229910001080 W alloy Inorganic materials 0.000 claims description 6
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 5
- 229910052721 tungsten Inorganic materials 0.000 claims description 5
- 239000010937 tungsten Substances 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 2
- 239000000843 powder Substances 0.000 claims description 2
- 238000005245 sintering Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims 1
- 229910052702 rhenium Inorganic materials 0.000 claims 1
- WUAPFZMCVAUBPE-UHFFFAOYSA-N rhenium atom Chemical compound [Re] WUAPFZMCVAUBPE-UHFFFAOYSA-N 0.000 claims 1
- 238000002485 combustion reaction Methods 0.000 description 7
- 238000005336 cracking Methods 0.000 description 7
- 238000009863 impact test Methods 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000013021 overheating Methods 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
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)
Description
【発明の詳細な説明】
本発明は主として始動のためデイーゼルエンジ
ンに装着されるセラミツクグロープラグに関し、
特にその発熱体となるセラミツクヒーターに係る
ものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ceramic glow plug installed in a diesel engine mainly for starting.
In particular, it relates to a ceramic heater that serves as the heating element.
一般にデイーゼルエンジンは始動性を向上させ
るため副燃焼室等にグロープラグを装着し、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り、始動時
に急速な昇温特性をもつことが要求されるととも
に、始動後においても燃焼安定化のためのアフタ
ーグローとして長時間使用される傾向となつてい
るため、その耐久性の向上が益々必要とされてき
ている。 Generally, in order to improve startability of a diesel engine, a glow plug is installed in the auxiliary combustion chamber, etc., and the glow plug is energized to red-hot and burns a portion of the fuel injected into the cabin to preheat it. In addition to being required to have rapid temperature rise characteristics during startup, there is also a tendency for fuel to be used for long periods of time as an afterglow to stabilize combustion even after startup, so there is an increasing need for improved durability. It has been done.
この目的に応ずる急速加熱型グロープラグとし
て、従来高融点金属のタングステンＷ発熱線をセ
ラミツク粉体中に埋設し焼結してなるセラミツク
ヒーターを用いたセラミツクグロープラグが知ら
れており、その発熱体は第１図にその要部を示す
如く、セラミツクヒーター１が取付金具２の内腔
にろう接された金属外筒３の先端から突出した構
造をもつものである。 As a rapid heating type glow plug for this purpose, a ceramic glow plug using a ceramic heater made by embedding a high-melting point metal tungsten W heating wire in ceramic powder and sintering it has been known. As shown in FIG. 1, the ceramic heater 1 has a structure in which a ceramic heater 1 protrudes from the tip of a metal outer cylinder 3 which is soldered to the inner cavity of a mounting bracket 2.
ところでこの種グロープラグは、エンジンの始
動等には極めて有効である反面、渦流室等燃焼室
内に前記ヒーター部１′が突出している為始動後
における燃焼安定化のためのアフターグローとし
ての長時間運転域においては、この突出部が障害
物となつて渦流形成を阻害し燃焼性に影響を与
え、エンジン出力の低下、燃費の悪化、有害な排
気ガスの増大等エンジン性能に悪影響を及ぼすと
いう問題があり、従つて前記金属外筒３から突出
するヒーター部１′は、その突出寸法ｌが可及的
に短かく、又外径Ｄが可及的に細く形成されるこ
とが好ましいものである。 By the way, this type of glow plug is extremely effective for starting the engine, etc., but because the heater part 1' protrudes into the combustion chamber such as the vortex chamber, it is used for a long time as an afterglow to stabilize combustion after starting. In the operating range, this protrusion becomes an obstacle, obstructs the formation of vortices, and affects combustion performance, resulting in negative effects on engine performance such as a reduction in engine output, deterioration of fuel efficiency, and an increase in harmful exhaust gas. Therefore, it is preferable that the heater part 1' protruding from the metal outer cylinder 3 has a protrusion dimension l as short as possible and an outer diameter D as thin as possible. .
然し乍らヒーター部１′の外径Ｄを細くするこ
とは、室内の過酷な急熱急冷の熱サイクル及び運
転時における振動、衝撃等の条件下において破損
し易くなり、機械的強度面から制約される。この
機械的強度を増すため、第２図に示す如くヒータ
ー部１′の突出寸法l1が短かくなるように金属外
筒３′を長くして蔽い補強する例があるが、内部
に埋設されている発熱線コイル４の長さl2に相当
する部分が金属外筒３′で蔽われるため発熱効率
が阻害される許りでなく、この部分における発熱
線コイルの温度が過大に上昇し、金属外筒３′と
の接合部におけるろう材を溶融させるという不具
合があり、又、発熱線の材質、線径は従来のまゝ
でヒーター部の突出寸法を単に短かくすること
は、これに伴ない内部に埋設される発熱線コイル
の長さが短かくなる為抵抗値が低下し所要の発熱
量が得られないという問題点があつた。 However, reducing the outer diameter D of the heater part 1' is restricted from the mechanical strength point of view, as it becomes susceptible to damage under conditions such as severe indoor thermal cycles of rapid heating and cooling, and vibrations and shocks during operation. . In order to increase this mechanical strength, there is an example in which the metal outer cylinder 3' is lengthened to cover and reinforce the heater part 1' so that the protruding dimension l1 of the heater part 1' is shortened, as shown in Fig. 2. Since the part corresponding to the length l 2 of the heating wire coil 4 is covered with the metal outer cylinder 3', the heat generation efficiency is not only hindered, but also the temperature of the heating wire coil in this part increases excessively. However, there is a problem in that the brazing material at the joint with the metal outer cylinder 3' is melted, and it is not possible to simply shorten the protruding dimension of the heater part while keeping the material and diameter of the heating wire as before. As a result, the length of the heating wire coil buried inside the device became shorter, resulting in a lower resistance value and a problem in that the required amount of heat could not be obtained.
本発明は、このような実状に鑑みなされたもの
であつて、上記せる如き問題点を解決するものと
して、セラミツクヒーターの外径を細くし、発熱
線の電圧を分圧することによつて該発熱線コイル
を所定の突出寸法内に配設するもので、その特徴
はセラミツクヒーターの発熱線コイルに従来用い
られている純タングステンＷ又は該純タングステ
ンＷ線材より大きい固有抵抗をもつRe−Ｗ合金
を用いヒーター部を小型化すると共に、該セラミ
ツクヒーターに、前記発熱線コイルに用いた線材
より温度−抵抗係数（常温における抵抗値と、
1000℃の高温時における抵抗値との比）が５倍以
上の金属線材を使用した抵抗体を組合せ直列に接
続することにより急速昇温時における通電を制御
し、ヒーター部の過熱を防止するようにした構造
をもち始動特性が優れ、耐久性を向上したセラミ
ツクヒーターを提供しようとするものである。 The present invention was developed in view of the above-mentioned circumstances, and aims to solve the above-mentioned problems by reducing the outer diameter of the ceramic heater and dividing the voltage of the heating wires to reduce the heat generation. The wire coil is arranged within a predetermined protrusion dimension, and its feature is that it uses pure tungsten W, which is conventionally used in the heating wire coil of ceramic heaters, or a Re-W alloy that has a higher specific resistance than the pure tungsten W wire. In addition to downsizing the heater section used, the ceramic heater has a temperature-resistance coefficient (resistance value at room temperature,
By connecting in series a combination of resistors using metal wires with a resistance value (ratio of resistance value at a high temperature of 1000℃) that is 5 times or more, it is possible to control current flow during rapid temperature rise and prevent overheating of the heater part. The present invention aims to provide a ceramic heater having a structure with excellent starting characteristics and improved durability.
以下図面を用いて詳細に説明する。 This will be explained in detail below using the drawings.
第３図は本発明セラミツクグロープラグの実施
例縦断面図で、セラミツクヒーター１０は、金属
外筒１１の先端面から突出するヒーター部１０′
内に埋設する発熱線コイル１２に、固有抵抗が純
Ｗより大きく、かつ温度−抵抗係数が４倍以下と
なるような正の抵抗温度係数をもつRe−Ｗ合金
線材を用いて、その外径（断面が真円でなく楕円
類形状のものにあつてはその長径）Ｄが4.0mm以
下で、金属外筒１１の先端面から突出するヒータ
ー部１０′の突出寸法ｌが3D以下となるように形
成されてなるものである。 FIG. 3 is a longitudinal cross-sectional view of an embodiment of the ceramic glow plug of the present invention, in which the ceramic heater 10 has a heater portion 10' protruding from the front end surface of the metal outer cylinder 11.
For the heating wire coil 12 buried inside, a Re-W alloy wire having a specific resistance larger than that of pure W and a positive temperature coefficient of resistance such that the temperature-resistance coefficient is 4 times or less is used, and its outer diameter (If the cross section is not a perfect circle but an ellipsoid, the major axis thereof) D is 4.0 mm or less, and the protrusion dimension l of the heater part 10' protruding from the tip surface of the metal outer cylinder 11 is 3D or less. It is formed by
セラミツクヒーターの外径Ｄを4.0mm以下とし、
その突出寸法ｌを外径Ｄの３倍以下とする理由
は、ＷにReを添加したＷ合金線材を発熱線に用
いたセラミツクヒーターに、Ni線材を用いた抵
抗体コイルを直列に接続してなる本発明セラミツ
クグロープラグの実施例につき行なつた以下に述
べる急速通電加熱テスト及び落下衝撃テストの結
果によるものである。 The outer diameter D of the ceramic heater is 4.0 mm or less,
The reason why the protruding dimension l is set to be less than three times the outer diameter D is that a resistor coil made of Ni wire is connected in series to a ceramic heater using W alloy wire with Re added as the heating wire. This is based on the results of the following rapid current heating test and drop impact test conducted on the ceramic glow plug of the present invention.
即ち、第４図は急速通電加熱テストの結果を示
したグラフで上記グロープラグに、2.0mm、3.0
mm、4.0mm、4.3mmの４種類の外径Ｄを有するセラ
ミツクヒーターを用いた試料につき、900℃迄の
昇温条件を変えて最高1300℃迄急速に通電加熱し
たときの各試料の900℃迄の昇温条件（時間）と
セラミツク割れが発生する温度との関係をグラフ
化したものであり、各曲線の左側ハツチング部分
はセラミツク割れの発生ゾーンを示し、例えばヒ
ーター外径Ｄ＝4.0mmの曲線について見た場合、
約1300℃に於ては900℃の温度に達する昇温時間
を1.4秒以内とするセラミツク割れを発生し、約
1125℃に於ては1.3秒以内、約1025℃では1.2秒以
内とするとセラミツク割れが発生することを示し
ており、グラフで見られる如く外径Ｄが細くなる
程900℃迄の昇温時間は短縮でき、太くなる程発
熱線の温度上昇に対してセラミツクの追随が遅れ
熱歪みによりセラミツク割れが発生し易くなる
為、900℃迄の昇温時間は短縮し難くなることを
示している。従つて良好な始動性及び燃焼安定性
を得るために要求されている900℃迄の昇温時間
1.5秒以内という条件を満足させるためにはヒー
ター外径Ｄを4.0mm以下とすることが良いことが
判る。 That is, Figure 4 is a graph showing the results of the rapid current heating test.
For samples using ceramic heaters with four types of outer diameters D: mm, 4.0 mm, and 4.3 mm, each sample was heated to 900°C by changing the heating conditions up to 900°C and rapidly heated to a maximum of 1300°C. This graph shows the relationship between the heating conditions (time) and the temperature at which ceramic cracking occurs.The hatched part on the left side of each curve indicates the zone where ceramic cracking occurs.For example, when the outer diameter of the heater is D = 4.0 mm, When looking at curves,
At approximately 1300℃, ceramic cracking occurs when the temperature rises to 900℃ within 1.4 seconds.
This shows that ceramic cracking occurs within 1.3 seconds at 1125℃, and within 1.2 seconds at about 1025℃, and as seen in the graph, the smaller the outer diameter D becomes, the shorter the heating time to 900℃ becomes. This shows that the shorter and thicker the heating wire, the slower the ceramic follows the temperature rise of the heating wire and the more likely ceramic cracking will occur due to thermal distortion, making it difficult to shorten the heating time up to 900°C. Therefore, the temperature rise time to 900℃ is required to obtain good startability and combustion stability.
It can be seen that in order to satisfy the condition of 1.5 seconds or less, it is better to set the outer diameter D of the heater to 4.0 mm or less.
又第５図は、セラミツクヒーターの外径Ｄが
2.0mmで突出寸法ｌが5.0mm及び8.0mmのもの、外径
Ｄが3.0mmで突出寸法ｌが5.0mm、9.0mm及び12.0mm
のもの、ならびに外径Ｄが4.0mmで、突出寸法ｌ
が10.0mm、12.0mm、14.0mmの８種類のセラミツク
グロープラグ試料について行なつた落下衝撃試験
結果を示したグラフで、試料を水平に保持し、コ
ンクリート床上に落下させ、ヒーター部が破損し
たときの落下高さとヒーターの突出寸法ｌとの関
係を示したものであり、実用上の見地から少くと
も1.5ｍ以上の落下高さに耐えるものとするため
にはヒーターの突出寸法ｌは、3D以下とする必
要のあることが判る。 Also, Fig. 5 shows that the outer diameter D of the ceramic heater is
2.0mm with protruding dimensions l of 5.0mm and 8.0mm, outer diameter D of 3.0mm and protruding dimensions l of 5.0mm, 9.0mm, and 12.0mm.
and the outer diameter D is 4.0 mm and the protrusion dimension l
This is a graph showing the results of a drop impact test conducted on eight types of ceramic glow plug samples of 10.0 mm, 12.0 mm, and 14.0 mm.The sample was held horizontally and dropped onto a concrete floor, and the heater part was damaged. This shows the relationship between the fall height of the heater and the heater's protrusion dimension l.From a practical standpoint, in order to withstand a drop height of at least 1.5m, the heater's protrusion dimension l must be 3D or less. It turns out that it is necessary to do so.
前記せる如く構成されてなるセラミツクヒータ
ー１０は、金属外筒１１に接合されると共に内部
に埋設されている発熱線コイル１２の一端１２ａ
が接続され、金属外筒１１はさらに取付金具１３
にろう接されて側電極を構成している。 The ceramic heater 10 configured as described above has one end 12a of the heating wire coil 12 which is joined to the metal outer cylinder 11 and is buried inside.
is connected, and the metal outer cylinder 11 is further connected to the mounting bracket 13.
are soldered to form the side electrodes.
一方発熱線コイル１２の他端１２ｂはセラミツ
クヒーター１０の後端部に挿嵌固着された金属キ
ヤツプ１４に接続され、該キヤツプ１４に溶接さ
れたリード線１５を経て抵抗体１６に接続され、
抵抗体１６の他端が中軸１７に接続されて電極
となるように構成されており、前記抵抗体の線材
に、温度−抵抗係数が５倍以上となるような正の
抵抗温度係数をもつ金属線材、例えばタングステ
ンＷ、モリブデンMo、ニツケルNi、鉄Fe等を用
いてなるものである。 On the other hand, the other end 12b of the heating wire coil 12 is connected to a metal cap 14 inserted and fixed to the rear end of the ceramic heater 10, and connected to a resistor 16 via a lead wire 15 welded to the cap 14.
The other end of the resistor 16 is connected to the center shaft 17 to serve as an electrode, and the wire of the resistor is made of a metal having a positive temperature coefficient of resistance such that the temperature-resistance coefficient is 5 times or more. It is made of wire such as tungsten W, molybdenum Mo, nickel Ni, iron Fe, etc.
なお、発熱線コイル１２及び抵抗体１６の抵抗
値は、所要の発熱条件に応じ設定される。 Note that the resistance values of the heating wire coil 12 and the resistor 16 are set according to required heating conditions.
第６図は、ヒーター外径Ｄ＝３mm、突出寸法ｌ
＝５mmの前記せる如き構造をもつ本発明実施例の
セラミツクグロープラグに通電し急速昇温させた
時の時間と、発熱線コイルを埋設したヒーター部
の温度及び抵抗体の温度との関係を実測した結果
を示すグラフであり、図から明らかな如くヒータ
ー部に埋設された発熱線コイルには温度−抵抗係
数の小さい（４倍以下）のRe−Ｗ合金線材が用
いられ、これに温度−抵抗係数が大きい（５倍以
上）金属線材を用いた抵抗体を組合せ直列に接続
している為、通電による急速昇温時において抵抗
体の抵抗値が発熱線コイルより速かに増大し、自
己制御により加熱電流を低減せしめ、発熱線コイ
ル即ちヒーター部の過熱を極めて有効に抑制する
ことができることを示している。 Figure 6 shows heater outer diameter D = 3 mm and protrusion dimension l.
= 5mm The relationship between the time when the ceramic glow plug according to the embodiment of the present invention having the structure as shown above is energized and rapidly heated, and the temperature of the heater section in which the heating wire coil is buried and the temperature of the resistor was actually measured. As is clear from the figure, Re-W alloy wire with a small temperature-resistance coefficient (4 times or less) is used for the heating wire coil embedded in the heater part, and this Since resistors using metal wires with a large coefficient (more than 5 times) are connected in series, the resistance value of the resistor increases faster than the heating wire coil when the temperature rises rapidly due to energization, resulting in self-control. This shows that the heating current can be reduced and overheating of the heating wire coil, that is, the heater section can be extremely effectively suppressed.
以上の説明から理解されるように、本発明セラ
ミツクグロープラグは、セラミツクヒーターの発
熱線を分圧することによつて、又は該発熱線に従
来用いられている純Ｗ線材より大きい固有抵抗を
有するRe−Ｗ合金線材を用いることによつて発
熱線コイルが小型化し、これに伴なつてヒーター
部の露出長が短かくなる為燃焼室内の渦流形成を
阻害することが少なく、又振動、衝撃等に対する
機械的強度が向上されたものとなるほか、取付金
具内腔内で、前記セラミツクヒーターのヒーター
部に埋設された発熱線より大きい温度−抵抗係数
をもつ金属線材を用いた抵抗体が該セラミツクヒ
ーターに組合せ直列に接続されている為、急速昇
温時において抵抗体の抵抗値が発熱線コイルより
速かに増加し加熱電流を減少させることによつて
ヒーター部の過熱が抑制され、熱衝撃によるセラ
ミツク割れや発熱線コイルの破断を防止できるも
のとなる等多くの特長を有するもので、従来の問
題点を解決し、エンジンの始動特性を改善し、耐
久性を向上させたセラミツ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, the ceramic glow plug of the present invention is produced by dividing the pressure of the heating wire of a ceramic heater, or by using a resin having a higher specific resistance than the pure W wire material conventionally used for the heating wire. - By using W alloy wire, the heating wire coil is smaller, and the exposed length of the heater part is shortened, so it is less likely to interfere with the formation of vortices in the combustion chamber, and it is also resistant to vibrations, shocks, etc. In addition to improved mechanical strength, the ceramic heater is equipped with a resistor made of a metal wire having a temperature-resistance coefficient larger than that of the heating wire embedded in the heater part of the ceramic heater in the inner cavity of the mounting bracket. Because the resistor is connected in series with the heater, the resistance value of the resistor increases faster than the heating wire coil during rapid temperature rise, reducing the heating current and suppressing overheating of the heater section, thereby preventing thermal shock. It has many features such as preventing ceramic cracking and heating wire coil breakage, and is offered as a ceramic glow plug that solves conventional problems, improves engine starting characteristics, and improves durability. It is possible.
第１図は、従来のセラミツクグロープラグのセ
ラミツクヒーターについての要部を示す正面図、
第２図は金属外筒でセラミツクヒーターを補強し
た他の従来例の要部縦断面図、第３図は本発明セ
ラミツクグロープラグの実施例縦断面図、第４図
は急速通電加熱テストにおけるヒーター外径に対
する昇温条件とセラミツク割れ発生温度との関係
を示すグラフ、第５図は、落下衝撃テストにおけ
るヒーター突出寸法と破損する落下高さとの関係
を示すグラフ、第６図は本発明セラミツクグロー
プラグの実施例における急速昇温時の通電時間
と、ヒーター部及び、抵抗体の温度との関係を示
すグラフである。
１，１０：セラミツクヒーター、１′，１０′：
ヒーター部、２，１３：取付金具、３，３′，１
１：金属外筒、４，１２：発熱線コイル、１６：
抵抗体、１７：中軸、ｌ：突出寸法、Ｄ：外径。
FIG. 1 is a front view showing the main parts of the ceramic heater of a conventional ceramic glow plug;
Fig. 2 is a vertical cross-sectional view of a main part of another conventional example in which a ceramic heater is reinforced with a metal outer cylinder, Fig. 3 is a longitudinal cross-sectional view of an embodiment of the ceramic glow plug of the present invention, and Fig. 4 is a heater in a rapid current heating test. A graph showing the relationship between the heating conditions for the outer diameter and the temperature at which ceramic cracking occurs. Figure 5 is a graph showing the relationship between the heater protrusion dimension and the drop height at which breakage occurs in a drop impact test. Figure 6 is a graph showing the relationship between the ceramic glow of the present invention and the heater protrusion dimension in a drop impact test. It is a graph showing the relationship between the energization time during rapid temperature rise and the temperature of the heater part and the resistor in an example of the plug. 1, 10: Ceramic heater, 1', 10':
Heater part, 2, 13: Mounting bracket, 3, 3', 1
1: Metal outer cylinder, 4, 12: Heating wire coil, 16:
Resistor, 17: center shaft, l: protrusion dimension, D: outer diameter.
Claims (1)
設し焼結して成るセラミツクヒーターが、金属外
筒の先端面から突出してその内腔にろう接され、
該金属外筒が取付金具の先端部内腔に接合されて
成るセラミツクグロープラグにおいて、前記セラ
ミツクヒーターの外径Ｄが4.0mm以下、金属外筒
の先端面からの突出寸法ｌが3D以下となるよう
に形成され、発熱線コイルが前記突出寸法内に埋
設されてなるとともに、前記発熱コイルとして固
有抵抗が純Ｗよりも大きく、かつ、温度−抵抗係
数（常温−1000℃）が４倍以下となるような正の
抵抗温度係数をもつレニウムReと残部タングス
テンＷからなるＷ合金線材を用い、又上記抵抗体
として温度−低抗係数が５倍以上となるような金
属線材を用い、更に前記セラミツクヒーターに、
抵抗体が取付金具内腔内で直列に接続されて成る
ことを特徴とするセラミツクグロープラグ。1 A ceramic heater made by embedding and sintering a heating wire of a high melting point metal in ceramic powder protrudes from the tip surface of a metal outer cylinder and is soldered to the inner cavity of the metal outer cylinder,
In the ceramic glow plug in which the metal outer cylinder is joined to the inner cavity of the distal end of the mounting bracket, the outer diameter D of the ceramic heater is 4.0 mm or less, and the protrusion dimension l from the distal end surface of the metal outer cylinder is 3D or less. The heating wire coil is embedded within the protruding dimension, and the heating coil has a specific resistance larger than that of pure W and a temperature-resistance coefficient (room temperature - 1000°C) of 4 times or less. A W alloy wire consisting of rhenium Re and the remainder tungsten W having a positive temperature coefficient of resistance is used, and a metal wire having a temperature-low resistance coefficient of 5 times or more is used as the resistor, and the ceramic heater To,
A ceramic glow plug characterized in that resistors are connected in series within the bore of a mounting bracket.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17320783A JPS6066018A (en) | 1983-09-21 | 1983-09-21 | Ceramic glow plug |
| US06/652,659 US4650963A (en) | 1983-09-21 | 1984-09-20 | Ceramic glow plug |
| DE19843434762 DE3434762A1 (en) | 1983-09-21 | 1984-09-21 | CERAMIC GLOW PLUG |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17320783A JPS6066018A (en) | 1983-09-21 | 1983-09-21 | Ceramic glow plug |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6066018A JPS6066018A (en) | 1985-04-16 |
| JPS6347964B2 true JPS6347964B2 (en) | 1988-09-27 |
Family
ID=15956096
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17320783A Granted JPS6066018A (en) | 1983-09-21 | 1983-09-21 | Ceramic glow plug |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6066018A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011038758A (en) * | 2009-07-14 | 2011-02-24 | Ihi Corp | Burner device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6064039A (en) * | 1998-04-15 | 2000-05-16 | Ngk Spark Plug Co., Ltd. | Glow plug with small-diameter sheath tube enclosing heating and control coils |
-
1983
- 1983-09-21 JP JP17320783A patent/JPS6066018A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011038758A (en) * | 2009-07-14 | 2011-02-24 | Ihi Corp | Burner device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6066018A (en) | 1985-04-16 |
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