JPH08189640A - Self-control type ceramic glow plug - Google Patents

Self-control type ceramic glow plug

Info

Publication number
JPH08189640A
JPH08189640A JP1877995A JP1877995A JPH08189640A JP H08189640 A JPH08189640 A JP H08189640A JP 1877995 A JP1877995 A JP 1877995A JP 1877995 A JP1877995 A JP 1877995A JP H08189640 A JPH08189640 A JP H08189640A
Authority
JP
Japan
Prior art keywords
heating
heating element
tip
coil
control resistor
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.)
Ceased
Application number
JP1877995A
Other languages
Japanese (ja)
Inventor
Takanori Mizuno
隆徳 水野
Kazuhiro Igarashi
一博 五十嵐
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Niterra Co Ltd
Original Assignee
NGK Spark Plug Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NGK Spark Plug Co Ltd filed Critical NGK Spark Plug Co Ltd
Priority to JP1877995A priority Critical patent/JPH08189640A/en
Publication of JPH08189640A publication Critical patent/JPH08189640A/en
Ceased legal-status Critical Current

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Abstract

PURPOSE: To achieve a preheating of suction air quickly and surely at a low temperature starting. CONSTITUTION: A resistance 4 for control and a U-shaped heating coil 5 are arranged in a tip part of a heating body and moreover, the resistance for control is formed in a shape of a wave with a fixed amplitude in the diametrical direction of the heating body and as regard to the heating coil 5, two heating coils 5 are arranged at positions with an equal distance to the amplitude of the resistance 4 for control and orthogonal to each other. This accomplishes a quick heating of the tip part of the heating body exposed to suction air with the resistance 4 for control and the heating coils 5. This also enables the heating of the surface of the heating body evenly according to a positional relationship presenting a cross between the resistance 4 for control and the heating coils 5.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は、内燃機関、特にディ
ーゼルエンジンの低温時の始動性を改善するために、副
燃焼室や主燃焼室内において吸入空気を予熱するセラミ
ックグロープラグに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceramic glow plug for preheating intake air in an auxiliary combustion chamber or a main combustion chamber in order to improve startability of an internal combustion engine, particularly a diesel engine, at low temperatures.

【0002】[0002]

【従来の技術】従来、ディーゼルエンジンの低温時の始
動性を改善するために副燃焼室等内において吸入空気を
予熱するセラミックグロープラグにおいて、実際に吸入
空気を予熱する発熱体内に埋設する発熱線は、吸入空気
に対する予熱を迅速に行うために発熱体の温度上昇を効
率よく行う必要があることから、セラミック焼結体より
なる発熱体内に埋設する発熱線を正の抵抗温度係数の比
較的小さな導電材料によりなるものとすると共に、その
発熱線より大きな正の抵抗温度係数を有する制御用抵抗
体を金具内に配して上記発熱線と直列に接続した自己制
御のもの(特公平1−55369号)や、セラミック焼
結体よりなる発熱体内において、抵抗体コイルと発熱線
コイルとを直列に接続すると共に一体に埋設してなるも
の(特公平4−34052号)、更に上記発熱体への大
量の熱供給と共に吸入空気に対する予熱を均一に行える
ように、セラミック焼結体よりなる発熱体の表面温度を
均一にするものとして、セラミック焼結体よりなる発熱
体内において複数の発熱抵抗体を均一に配置してなるも
の(特開昭61−195580号)等が提案されてい
る。
2. Description of the Related Art Conventionally, in a ceramic glow plug that preheats intake air in a sub-combustion chamber or the like in order to improve startability at low temperature of a diesel engine, a heating wire embedded in a heating element that actually preheats intake air. Since it is necessary to efficiently raise the temperature of the heating element in order to rapidly preheat the intake air, the heating wire embedded in the heating element made of a ceramic sintered body has a relatively small positive resistance temperature coefficient. A self-controlled one made of an electrically conductive material and having a control resistor having a positive temperature coefficient of resistance larger than that of the heating wire arranged in the metal fitting and connected in series with the heating wire (Japanese Patent Publication No. 1-55369). No.) or a heating element made of a ceramic sintered body, in which a resistor coil and a heating wire coil are connected in series and integrally embedded (Japanese Patent Publication No. 4-3). No. 052), further, in order to uniformly supply a large amount of heat to the heating element and to preheat the intake air uniformly, the heating element made of the ceramic sintering element is made to have a uniform surface temperature. A device in which a plurality of heating resistors are uniformly arranged in a heating element (Japanese Patent Laid-Open No. 61-195580) has been proposed.

【0003】[0003]

【発明が解決しようとする課題】しかしながら、上記の
従来のものにおいて、特公平1−55369号の場合、
セラミック焼結体よりなる発熱体内に埋設する発熱線を
抵抗温度係数の比較的小さな導電材料によりなるものと
すると共に、その発熱線より大きな抵抗温度係数を有す
る制御用抵抗体を金具に配し発熱線と直列に接続するも
のであるため、電流を供給して昇温特性を迅速にし、制
御用抵抗体によって発熱体の飽和温度を制御するものと
なるが、制御用抵抗体の熱が無駄に消費されている。ま
た特公平4−34052号の場合のように、発熱体内に
抵抗体コイルと発熱線コイルとを直列に接続すると共に
一体に埋設してなるものであっても、確かに発熱体に対
する発熱線コイルからの熱量は、抵抗体コイルから発生
する熱量をも含めてより大量となり、この大量の熱量の
供給を背景としての迅速な発熱体の温度上昇は実現し得
るものであるが、抵抗体コイル自体は発熱体内に埋設は
されているものの直接吸入空気に晒される発熱体の先端
部には存在せず、専ら発熱体を構成するセラミック焼結
体内での熱伝導による熱供給に留まり、吸入空気によっ
て発熱体の先端部において急激な温度の低下が生じた場
合には、十分に吸入空気の予熱を行うことができない恐
れがある。
However, in the case of Japanese Patent Publication No. 1-55369, in the above-mentioned conventional one,
The heating wire embedded in the heating element made of a ceramic sintered body is made of a conductive material having a relatively small resistance temperature coefficient, and a control resistor having a resistance temperature coefficient higher than that of the heating wire is placed on the metal fitting to generate heat. Since it is connected in series with the wire, it supplies current to speed up the temperature rise characteristics and controls the saturation temperature of the heating element with the control resistor, but the heat of the control resistor is wasted. Has been consumed. Further, as in the case of Japanese Patent Publication No. 4-34052, even if the resistor coil and the heating wire coil are connected in series in the heating element and are integrally embedded, the heating wire coil for the heating element is surely provided. The amount of heat from the resistor coil becomes larger, including the amount of heat generated from the resistor coil, and it is possible to realize a rapid temperature rise of the heating element against the background of the supply of this large amount of heat, but the resistor coil itself. Is embedded in the heating element, but does not exist at the tip of the heating element that is directly exposed to the intake air, and is limited to heat supply by heat conduction in the ceramic sintered body that constitutes the heating element. If the temperature of the tip of the heating element suddenly drops, the intake air may not be sufficiently preheated.

【0004】更に、特開昭61−195580号の場合
には、発熱体への大量の熱供給と共に吸入空気に対する
予熱を均一に行えるように、セラミック焼結体よりなる
発熱体の表面温度を均一にするものとして、セラミック
焼結体よりなる発熱体内において複数の発熱抵抗体を均
一に配置してなるものであるが、確かに発熱体への大量
の熱供給及び発熱体表面の温度の均一化を実現し得るも
のであるが、ディーゼルエンジンの小型化と同時にセラ
ミックグロープラグの小型化が要求されることからセラ
ミックグロープラグを構成する発熱体においても細径、
短小化が要求され、この細径、小型化された発熱体内に
複数の発熱抵抗体を均等に配置しただけでは飽和温度が
上昇して発熱抵抗体が断線し易く、また発熱体のセラミ
ックが破損する恐れがあり、耐久性を損ねる欠点があ
る。
Further, in the case of Japanese Patent Laid-Open No. 61-195580, the surface temperature of the heating element made of a ceramic sintered body is made uniform so that a large amount of heat can be supplied to the heating element and the preheating of the intake air can be made uniform. In order to achieve this, a plurality of heating resistors are uniformly arranged in the heating element made of a ceramic sintered body, but it is true that a large amount of heat is supplied to the heating element and the temperature of the heating element surface is made uniform. However, since it is required to downsize the diesel engine at the same time as downsizing the ceramic glow plug, the heating element forming the ceramic glow plug also has a small diameter,
Shortness and miniaturization are required, and even if a plurality of heating resistors are evenly arranged in this small-diameter and miniaturized heating element, the saturation temperature rises and the heating resistor is easily broken, and the ceramic of the heating element is damaged. However, there is a drawback that durability is impaired.

【0005】そこで、この発明は上記従来のものの持つ
欠点を改善するものであり、簡単な構造により、発熱体
への大量の熱量の供給を実現すると共に、その熱供給に
対して発熱体表面の温度を均一なものとし、吸入空気の
予熱を迅速かつ確実に行えるようにするものである。
Therefore, the present invention solves the drawbacks of the above-mentioned conventional ones, and realizes the supply of a large amount of heat to the heating element with a simple structure, and the surface of the heating element responds to the heat supply. The temperature is made uniform so that the intake air can be preheated quickly and reliably.

【0006】[0006]

【課題を解決するための手段】そのために、金具の先端
に一体に固持される金属外筒内において、その先端を突
出するように保持されるセラミック焼結体よりなる発熱
体の先端部において、上記発熱体内にU字形状の発熱コ
イルと共に、この発熱コイルの先端で電気的導通を図る
制御用抵抗を埋設し、更にこの発熱コイルの先端で電気
的導通を図り、発熱体の径方向に対して振幅を有して波
状になる制御用抵抗を埋設した上、上記制御用抵抗の有
する発熱体の径方向に対する振幅と同等の距離を持っ
て、かつ、この振幅方向に対して互いに直交する位置に
おいて、制御用抵抗に導通する二つの発熱コイルを配置
してなるものである。
To this end, in the metal outer cylinder integrally fixed to the tip of the metal fitting, at the tip of the heating element made of a ceramic sintered body held so as to protrude, A U-shaped heat generating coil is embedded in the heat generating body, and a control resistor for electrical conduction is embedded at the tip of the heat generating coil. Further, electric conduction is achieved at the tip of the heat generating coil in the radial direction of the heat generating body. A control resistor that has an amplitude and a wavy shape is embedded, and the control resistor has a distance equivalent to the radial amplitude of the heating element of the control resistor and is orthogonal to the amplitude direction. In the above, two heating coils that are electrically connected to the control resistor are arranged.

【0007】[0007]

【作用】上記の構成を具えるので、直接吸入空気を予熱
するセラミック焼結体よりなる発熱体の先端部内に発熱
コイルと共に、この発熱コイルの先端で電気的導通を図
る制御用抵抗を埋設することで発熱コイルによって発生
する熱量に加えて、この発熱コイルに電気的導通を図る
制御用抵抗が発生する熱量を利用できることとなり、発
熱体に対して大量の熱量を供給することが可能となるた
め、ディーゼルエンジンの低温始動時において、迅速に
発熱体の先端部を加熱し、吸入空気に対する予熱を行う
ことができる。
With the above-mentioned structure, the heating coil is embedded in the tip of the heating element made of a ceramic sintered body for directly preheating the intake air, and the control resistor for electrical conduction is embedded at the tip of the heating coil. As a result, in addition to the amount of heat generated by the heating coil, the amount of heat generated by the control resistor for electrically connecting the heating coil can be used, and a large amount of heat can be supplied to the heating element. When the diesel engine is cold-started, the tip of the heating element can be quickly heated to preheat the intake air.

【0008】更に、この発熱コイルの先端で電気的導通
を図り、発熱体の径方向に対して振幅を有して波状にな
る制御用抵抗を埋設した上、上記制御用抵抗の有する発
熱体の径方向に対する振幅と同等の距離を持って、か
つ、この振幅に対して互いに直交する位置において、制
御用抵抗に導通する二つの発熱コイルを配置すること
で、その内部において熱量を発生する熱源、すなわち制
御用抵抗及び発熱コイルが、発熱体の断面中心から均等
に配置されることとなり、吸入空気を予熱する発熱体の
先端部の表面は均一に加熱され、制御用抵抗から発生す
る熱量をも含む大量の熱量の供給と相まって、低温始動
時における吸入空気の予熱を迅速かつ確実に行うことが
できるものである。
Further, by electrically connecting at the tip of the heating coil, a control resistor which has an amplitude in the radial direction of the heat generating element and has a wavy shape is embedded. A heat source that generates a heat quantity inside by arranging two heating coils that have a distance equivalent to the amplitude in the radial direction and are orthogonal to each other with respect to this amplitude and that conduct to the control resistor, That is, the control resistor and the heating coil are evenly arranged from the center of the cross section of the heating element, the surface of the tip of the heating element that preheats the intake air is uniformly heated, and the amount of heat generated by the control resistor is also increased. In combination with the supply of a large amount of heat including the above, the preheating of the intake air at the time of low temperature starting can be performed quickly and reliably.

【0009】[0009]

【実施例】この発明を図に示す実施例により更に説明す
る。(1)は、この発明の実施例である自己制御型セラ
ミックグロープラグであり、この自己制御型セラミック
グロープラグ(1)は、その先端部(3)を突出するよ
うに金属外筒(10)に固持すると共に、その内部にお
いて中軸(7)とリードコイル(8)を介して表面に導
出される正電極(6)と接続する制御用抵抗(4)と、
その制御用抵抗(4)と先端で電気的導通を図るU字形
状の複数の発熱コイル(5)を内設したセラミック焼結
体からなる発熱体(2)と、この制御用抵抗(4)及び
発熱コイル(5)を内設する発熱体(2)を固持し、発
熱体(2)内に内設される発熱コイル(5)より発熱体
(2)表面に導出される負電極(9),(9)と電気的
接続を行い、この負電極(9)と接合する金属外筒(1
0)を介してボディアースを行う金具(11)から構成
されるものである。
The present invention will be further described with reference to the embodiments shown in the drawings. (1) is a self-controlling type ceramic glow plug which is an embodiment of the present invention. The self-controlling type ceramic glow plug (1) has a metal outer cylinder (10) so that its tip (3) is projected. A control resistor (4) that is fixed to the positive electrode (6) and is connected to the positive electrode (6) that is led to the surface via the central shaft (7) and the lead coil (8).
A heating element (2) made of a ceramic sintered body in which a plurality of U-shaped heating coils (5) for electrically connecting the control resistor (4) at its tip end are provided, and the control resistor (4). And a negative electrode (9) which holds the heating element (2) internally having the heating coil (5) and is led to the surface of the heating element (2) from the heating coil (5) provided inside the heating element (2). ), (9) electrically connected to the negative electrode (9) to join the metal outer tube (1
It is composed of a metal fitting (11) for grounding the body through (0).

【0010】そして、金具(11)の先端に一体に固持
される金属外筒(10)内において、先端を突出するよ
うに保持されるSi34 、サイアロン、AlN等のセ
ラミック焼結体よりなる発熱体(2)の先端部(3)に
おいて、上記発熱体(2)内に発熱コイル(5)と共
に、この発熱コイル(5)の先端(12)で電気的導通
を図る制御用抵抗(4)を埋設するものである。
Then, in the metal outer cylinder (10) integrally fixed to the tip of the metal fitting (11), a ceramic sintered body of Si 3 N 4 , sialon, AlN or the like is held so as to project the tip. In the tip portion (3) of the heating element (2), the control resistor () is provided in the heating element (2) together with the heating coil (5) for electrical conduction at the tip (12) of the heating coil (5). 4) is buried.

【0011】更に、この発熱コイル(5)の先端で電気
的導通を図り、発熱体(2)の径方向に対して振幅を有
して波状になる制御用抵抗(4)を埋設した上、上記制
御用抵抗(4)の有する発熱体(2)の径方向に対する
振幅(L)と同等の距離(L’)を持って、かつ、この
制御用抵抗(4)の振幅方向に対して互いに直交する位
置において、制御用抵抗(4)に導通する二つの発熱コ
イル(5)(5)を配置してなるものである。
Furthermore, electrical resistance is achieved at the tip of the heating coil (5), and a control resistor (4) which has an amplitude and has a wavy shape in the radial direction of the heating element (2) is embedded. The control resistor (4) has a distance (L ') equal to the radial amplitude (L) of the heating element (2), and the control resistor (4) has an amplitude (L') in the radial direction. Two heating coils (5) and (5) electrically connected to the control resistor (4) are arranged at orthogonal positions.

【0012】なお、発熱コイル(5)の材料としては正
の抵抗温度係数(室温−1000℃)が3倍以下、好ま
しくは2倍以下のW−Re合金、MoSi2 、WC等の
導電性セラミック、また制御用抵抗(4)の材料として
は正の抵抗温度係数が4倍以上のW、Moや導電性セラ
ミックが適用できる。そしてこの発熱体(2)内に内設
される制御用抵抗(4)は、発熱コイル(5)の有する
温度−抵抗値よりも大きい温度−抵抗値を示す発熱コイ
ル(5)と電気的に直列に接続されているため、発熱コ
イル(5)の急速加熱時においても、速やかに制御用抵
抗(4)が昇温して、制御用抵抗(4)の抵抗値が増大
する一方で、発熱コイル(5)に対する加熱電流が低下
するため、急速な加熱時に発生し易い発熱コイル(4)
の断線やセラミック焼結体からなる発熱体(2)自身の
割れを防止するものである。
As the material of the heating coil (5), a positive temperature coefficient of resistance (room temperature-1000 ° C.) is 3 times or less, preferably 2 times or less, a conductive ceramic such as W-Re alloy, MoSi 2 or WC. As the material of the control resistor (4), W, Mo or conductive ceramic having a positive temperature coefficient of resistance of 4 times or more can be applied. The control resistor (4) provided in the heating element (2) is electrically connected to the heating coil (5) having a temperature-resistance value larger than the temperature-resistance value of the heating coil (5). Since they are connected in series, even when the heating coil (5) is rapidly heated, the temperature of the control resistor (4) rapidly rises, and the resistance value of the control resistor (4) increases, while heat is generated. Since the heating current for the coil (5) is reduced, the heating coil (4) is likely to be generated during rapid heating.
It is intended to prevent the wire breakage and the cracking of the heating element (2) itself made of a ceramic sintered body.

【0013】この発明の実施例であるセラミックグロー
プラグ(1)は、以上の構成を具えるので、低温始動時
において、直接吸入空気を予熱するセラミック焼結体よ
りなる発熱体(2)の先端部(3)内においてU字形状
の発熱コイル(5)と共に、この発熱コイル(5)の先
端で電気的導通を図る制御用抵抗(4)を埋設すること
によって、中軸(7)より発熱体(2)の表面に導出さ
れる正電極(6)に接続するリードコイル(8)を介し
て通電が行われると、この通電により発熱コイル(5)
によって発生する熱量に加えて、この発熱コイル(5)
に電気的導通を図り、発熱コイル(5)よりも迅速に昇
温する制御用抵抗(4)が発生する熱量をも利用して発
熱体(2)に対して大量の熱量を供給することが可能と
なるため、ディーゼルエンジンの低温始動時において、
発熱体(2)の先端部(3)を加熱し、吸入空気に対す
る予熱を迅速に行うことができる。
Since the ceramic glow plug (1) according to the embodiment of the present invention has the above-mentioned structure, the tip of the heating element (2) made of a ceramic sintered body that directly preheats the intake air at the time of low temperature starting. By embedding a U-shaped heating coil (5) in the part (3) and a control resistor (4) for electrical conduction at the tip of the heating coil (5), the heating element is made to move from the center shaft (7). When electricity is supplied through the lead coil (8) connected to the positive electrode (6) led to the surface of (2), the heat generation coil (5) is generated by this electricity supply.
In addition to the amount of heat generated by this heating coil (5)
It is possible to supply a large amount of heat to the heat generating element (2) by also utilizing the amount of heat generated by the control resistor (4) that is electrically conducted to the heating coil (5) and that heats up faster than the heating coil (5). Because it becomes possible, at the cold start of the diesel engine,
The tip portion (3) of the heating element (2) can be heated to quickly preheat the intake air.

【0014】更に、この発熱コイル(5)の先端(1
2)で電気的導通を図り、発熱体(2)の径方向に対し
て振幅を有して波状になる制御用抵抗(5)を埋設した
上、上記制御用抵抗(4)の有する発熱体(2)の径方
向に対する振幅(L)と同等の距離(L’、すなわちL
≒L’)を持って、かつ、この制御用抵抗(4)の振幅
に対して互いに直交する位置において、制御用抵抗
(4)に導通する二つの発熱コイル(5)(5)を配置
することで、その発熱体(2)の内部において熱量を発
生する熱源、すなわち制御用抵抗(4)及び発熱コイル
(5)(5)が、発熱体(2)の断面中心から均等(す
なわち、十字形状)に配置されることとなり、吸入空気
を予熱するため吸入空気にさらされる発熱体(2)の先
端部(3)の表面は均一に加熱されるものとなり、上記
制御用抵抗(4)から発生する熱量をも含む大量の熱量
の供給と相まって、ディーゼルエンジンの低温始動時に
おける吸入空気の予熱を迅速かつ確実に行うことができ
るものである
Further, the tip (1) of the heating coil (5) is
The control resistor (5), which is electrically conductive in 2) and has an amplitude in the radial direction of the heat generating element (2) and becomes wavy, is embedded, and the heat generating element included in the control resistor (4). A distance (L ', that is, L) equivalent to the amplitude (L) in the radial direction of (2)
Two heating coils (5) and (5) that are electrically connected to the control resistor (4) are arranged at positions that have a value of L ′) and are orthogonal to the amplitude of the control resistor (4). As a result, the heat source that generates the amount of heat inside the heating element (2), that is, the control resistor (4) and the heating coils (5) and (5) are even (that is, cross-shaped) from the center of the cross section of the heating element (2). Shape), the surface of the tip portion (3) of the heating element (2) exposed to the intake air to preheat the intake air is uniformly heated, and the surface of the control resistor (4) Combined with the supply of a large amount of heat, including the amount of heat generated, the intake air can be preheated quickly and reliably when the diesel engine is cold started.

【0015】[0015]

【発明の効果】以上のとおり、低温始動時において、吸
入空気を予熱するため直接吸入空気にさらされる発熱体
の先端部に制御用抵抗及び発熱コイルを内設し、更にこ
の発熱体先端部内において埋設される制御用抵抗を発熱
体の径方向に対する振幅(L)と同等の距離(L’、す
なわちL≒L’)を持って、かつ、この制御用抵抗の振
幅に対して互いに直交する位置において、制御用抵抗に
導通する二つの発熱コイルを配置することで、発熱体自
身の加熱を迅速に行うと共に、この加熱に際して発熱体
表面を均一に加熱するものとすることで、吸入空気の予
熱を迅速に行うものとし、また発熱体表面に接触して加
熱される吸入空気に対しての予熱を確実に行えるように
することができるため、低温始動時の始動性を格段に向
上させることができる優れた効果を有するものである。
更に制御用抵抗によって発熱体の温度を1200℃以下
に抑え、耐久性をも向上することができる。
As described above, in order to preheat the intake air at the time of low temperature start, the control resistor and the heat generating coil are internally provided at the tip of the heating element directly exposed to the intake air, and further in the tip of the heating element. The embedded control resistor has a distance (L ', that is, L≈L') equal to the amplitude (L) of the heating element in the radial direction, and is at a position orthogonal to the amplitude of the control resistor. In the above, by arranging two heating coils that are connected to the control resistor, the heating element itself can be heated quickly and the surface of the heating element should be heated uniformly during this heating. Since it is possible to quickly perform preheating for the intake air that is heated by contacting the surface of the heating element, it is possible to significantly improve the startability at low temperature starting. Can And it has a superior effect.
Furthermore, the temperature of the heating element can be suppressed to 1200 ° C. or lower by the control resistor, and the durability can be improved.

【図面の簡単な説明】[Brief description of drawings]

【図1】この発明の実施例であるセラミックグロープラ
グの拡大断面図である。
FIG. 1 is an enlarged cross-sectional view of a ceramic glow plug that is an embodiment of the present invention.

【図2】その要部を拡大した断面図である。FIG. 2 is an enlarged sectional view of a main part thereof.

【図3】図2におけるA−A拡大断面図である。FIG. 3 is an enlarged cross-sectional view taken along the line AA in FIG.

【図4】図3におけるB−B拡大断面図である。FIG. 4 is an enlarged sectional view taken along line BB in FIG.

【符号の説明】[Explanation of symbols]

1 自己制御型セラミックグロープラグ 2 発熱体 3 (発熱体の)先端部 4 制御用抵抗 5 発熱コイル 6 正電極 7 中軸 8 リードコイル 9 負電極 10 金属外筒 11 金具 12 先端(導通部分) 1 Self-controlled ceramic glow plug 2 Heating element 3 Tip part (of heating element) 4 Control resistor 5 Heating coil 6 Positive electrode 7 Middle shaft 8 Lead coil 9 Negative electrode 10 Metal outer tube 11 Metal fitting 12 Tip (conduction part)

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 金具の先端に一体に固持される金属外筒
内において、その先端を突出するように保持されるセラ
ミック焼結体よりなる発熱体の先端部において、上記発
熱体内にU字形状の発熱コイルと共に、この発熱コイル
の先端で電気的導通を図る制御用抵抗を上記発熱コイル
と直交するように埋設してなる自己制御型セラミックグ
ロープラグ。
1. A U-shaped member inside the heating element at the tip of a heating element made of a ceramic sintered body that is held so as to project at the tip in a metal outer tube integrally fixed to the tip of the metal fitting. A self-control type ceramic glow plug which is embedded together with the heating coil so that a control resistor for electrically connecting at the tip of the heating coil is embedded so as to be orthogonal to the heating coil.
【請求項2】 金具の先端に一体に固持される金属外筒
内において、その先端を突出するように保持されるセラ
ミック焼結体よりなる発熱体の先端部において、上記発
熱体内にU字形状の発熱コイルと共に、この発熱コイル
の先端で電気的導通を図り、発熱体の径方向に対して振
幅を有して波状になる制御用抵抗を埋設した上、上記制
御用抵抗の有する発熱体の径方向に対する振幅と同等の
距離を持って、この振幅に対して互いに直交する位置に
おいて、制御用抵抗に導通する二つの発熱コイルを配置
してなる請求項1記載の自己制御型セラミックグロープ
ラグ。
2. A U-shaped member inside the heating element at the tip of a heating element made of a ceramic sintered body held so as to project at the tip in a metal outer tube integrally fixed to the tip of the metal fitting. Along with the heating coil, the electric resistance is achieved at the tip of the heating coil, and a control resistor that has an amplitude in the radial direction of the heating element and becomes wavy is embedded. 2. The self-control type ceramic glow plug according to claim 1, wherein two heating coils that are electrically connected to the control resistor are arranged at positions orthogonal to each other with respect to the amplitude in the radial direction.
JP1877995A 1995-01-12 1995-01-12 Self-control type ceramic glow plug Ceased JPH08189640A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1877995A JPH08189640A (en) 1995-01-12 1995-01-12 Self-control type ceramic glow plug

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1877995A JPH08189640A (en) 1995-01-12 1995-01-12 Self-control type ceramic glow plug

Publications (1)

Publication Number Publication Date
JPH08189640A true JPH08189640A (en) 1996-07-23

Family

ID=11981127

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1877995A Ceased JPH08189640A (en) 1995-01-12 1995-01-12 Self-control type ceramic glow plug

Country Status (1)

Country Link
JP (1) JPH08189640A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002061838A (en) * 2000-08-22 2002-02-28 Beru Ag Glow plug

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002061838A (en) * 2000-08-22 2002-02-28 Beru Ag Glow plug

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