JPH01102220A - Resistor for diesel engine preheating plug - Google Patents
Resistor for diesel engine preheating plugInfo
- Publication number
- JPH01102220A JPH01102220A JP25896887A JP25896887A JPH01102220A JP H01102220 A JPH01102220 A JP H01102220A JP 25896887 A JP25896887 A JP 25896887A JP 25896887 A JP25896887 A JP 25896887A JP H01102220 A JPH01102220 A JP H01102220A
- Authority
- JP
- Japan
- Prior art keywords
- outer shell
- hollow electrode
- substance
- resistance device
- glass
- 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
- 239000011521 glass Substances 0.000 claims abstract description 40
- 239000012212 insulator Substances 0.000 claims description 53
- 239000010445 mica Substances 0.000 claims description 7
- 229910052618 mica group Inorganic materials 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 2
- 239000000835 fiber Substances 0.000 claims description 2
- 238000009413 insulation Methods 0.000 abstract description 18
- 239000000843 powder Substances 0.000 abstract description 10
- 239000006060 molten glass Substances 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 5
- 239000000126 substance Substances 0.000 abstract 13
- 230000002093 peripheral effect Effects 0.000 abstract 3
- 230000006835 compression Effects 0.000 abstract 1
- 238000007906 compression Methods 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 6
- 238000010292 electrical insulation Methods 0.000 description 6
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical group [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 229920001342 Bakelite® Polymers 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 239000004637 bakelite Substances 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000000395 magnesium oxide Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 229910001120 nichrome Inorganic materials 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- XBJJRSFLZVLCSE-UHFFFAOYSA-N barium(2+);diborate Chemical compound [Ba+2].[Ba+2].[Ba+2].[O-]B([O-])[O-].[O-]B([O-])[O-] XBJJRSFLZVLCSE-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000005388 borosilicate glass Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- HTUMBQDCCIXGCV-UHFFFAOYSA-N lead oxide Chemical compound [O-2].[Pb+2] HTUMBQDCCIXGCV-UHFFFAOYSA-N 0.000 description 1
- 229910000464 lead oxide Inorganic materials 0.000 description 1
- ZPPSOOVFTBGHBI-UHFFFAOYSA-N lead(2+);oxido(oxo)borane Chemical compound [Pb+2].[O-]B=O.[O-]B=O ZPPSOOVFTBGHBI-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000011787 zinc oxide Substances 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
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機関に用いる予熱栓への通電電流を
制御する抵抗装置に関し、詳しくは安定した電気絶縁性
能を有する抵抗装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a resistance device for controlling the current flowing to a preheating plug used in a diesel engine, and more particularly to a resistance device having stable electrical insulation performance.
［従来の技術］
この種の抵抗装置としては、例えば、実公昭５０−２０
１７６号公報に開示されたものが知られている。この抵
抗装置は、第５図に示すように、略円筒状の外殻１００
と、第１絶縁体層１０１を介して外殻１００に挿通され
た円筒状の中空電極１０３と、第２絶縁体層１０４を介
して中空電極１０３に挿通された中心電極１０５と、外
殻１００の軸線延長上に配設された抵抗体１０６と、よ
り構成されている。[Prior art] As this type of resistance device, for example,
One disclosed in Japanese Patent No. 176 is known. This resistance device has a substantially cylindrical outer shell 100, as shown in FIG.
, a cylindrical hollow electrode 103 inserted into the outer shell 100 via the first insulator layer 101 , a center electrode 105 inserted into the hollow electrode 103 via the second insulator layer 104 , and the outer shell 100 . and a resistor 106 disposed on the axial extension of the resistor 106.
中空電極１０３は耐熱金属から形成されて一端１０３ａ
が封止され、他端１０３ｂが外殻１００内に挿通されて
いる。外殻１００と中空電極１０３との間には、ガラス
粉末が充填され加熱溶融後冷却固化して形成された筒状
のガラス体からなる第１絶縁体層１０１が介在して、外
殻１００と中空電極１０３とを絶縁するとともに溶着固
定している。The hollow electrode 103 is made of a heat-resistant metal and has one end 103a.
is sealed, and the other end 103b is inserted into the outer shell 100. A first insulating layer 101 is interposed between the outer shell 100 and the hollow electrode 103, which is made of a cylindrical glass body filled with glass powder, heated and melted, and then cooled and solidified. It is insulated from the hollow electrode 103 and fixed by welding.
中心電極１０５は中空電極１０３内に絶縁ブツシュを介
して挿通され、ニクロムなどから形成された抵抗体１０
６の両端が、中空電極１０３内で中心電極１０５の先端
と中空電極１０３の一り１０３ａ内表面とにそれぞれ溶
接されている。そして中心電極１０５および抵抗体１０
６と中空電極１０３０間には、マグネシャなどの耐熱電
気絶縁粉末が充填され第２絶縁体層１０４を形成してい
る。The center electrode 105 is inserted into the hollow electrode 103 through an insulating bushing, and has a resistor 10 made of nichrome or the like.
Both ends of the hollow electrode 103 are welded to the tip of the center electrode 105 and the inner surface of one part 103a of the hollow electrode 103, respectively. And the center electrode 105 and the resistor 10
6 and the hollow electrode 1030 is filled with heat-resistant electrical insulating powder such as magnesia to form a second insulator layer 104.
中空電極１０３の他端１０３ｂにはベークライトなどよ
り形成された絶縁リング１１０を介して金属製ワッシャ
１０８が圧入され、中空電極１０３と電気的に導通され
ている。また中心電極１０５の他端側にはナツト１０９
が螺合している。ワッシャ１０８には予熱栓に接続され
るリード線が接続され、ナツト１０９には電源からのリ
ード線が接続される。これらの中心電極１０５および中
空電極１０３の他端側は、ベークライトなどより形成さ
れた絶縁筒１１１と金属製ワッシャ１１２などを介して
ナツト１０９で固定される。A metal washer 108 is press-fitted into the other end 103b of the hollow electrode 103 via an insulating ring 110 made of Bakelite or the like, and is electrically connected to the hollow electrode 103. In addition, a nut 109 is attached to the other end of the center electrode 105.
are screwed together. A lead wire connected to the preheating plug is connected to the washer 108, and a lead wire from a power source is connected to the nut 109. The other ends of the center electrode 105 and the hollow electrode 103 are fixed with a nut 109 via an insulating cylinder 111 made of Bakelite or the like and a metal washer 112.
上記のように構成された抵抗装置は、中空電極１０３の
一端１０３ａが吸気マニホルド内に挿入され、外殻１０
０が吸気マニホルドに螺合することで取付けられる。そ
してナツト１０９に電源からのリード線を接続し、ワッ
シャ１０８と予熱栓とを接続して通電すると、予熱栓へ
の電流は抵抗体１０６で制限されるとともに、抵抗体１
０６が発熱するので、その熱でディーゼル機関への吸気
が暖められ暖気性能が向上する。In the resistance device configured as described above, one end 103a of the hollow electrode 103 is inserted into the intake manifold, and the outer shell 10
0 is installed by screwing onto the intake manifold. Then, when a lead wire from a power source is connected to the nut 109, and a washer 108 and a preheating plug are connected and energized, the current to the preheating plug is limited by the resistor 106, and the resistor 1
Since 06 generates heat, the heat warms the intake air to the diesel engine, improving the warm-up performance.
［発明が解決しようとする問題点］
上記した抵抗装置においては、外殻１００と中空電極１
０３とは、溶融ガラスが固化して形成された円筒状のガ
ラス体からなる第１絶縁体層１０１で絶縁され、かつ溶
着固定されている。ところでこの抵抗装置を製造する場
合、粉末ガラスを充填した後加熱して溶融する工程、あ
るいは溶融ガラスを外殻１００と中空電極１０３との間
に流し込む工程が行なわれる。しかしこの工程を行なう
際には外殻１００と中空電極１．０３とは固定されてい
ないため芯ずれが生じ、外殻１００と中空電極１０３と
の間の間隙の寸法が部分的に異なる場合がある。このよ
うな場合には、溶融して形成された第１絶縁体層１０１
の厚さが部分的に異なり、薄い部分では電気絶縁性能が
低下するという不具合が生ずる。また溶融したガラスが
外殻１００と中空電極１０３との間隙の開口部１００ａ
から流れ落ちるのを防止するためには、その間隙は開口
部１００ａで例えば０．３〜０．５ｍｍと小さくする必
要があり、上記不具合が一層生じやすい背景となってい
る。[Problems to be Solved by the Invention] In the above-described resistance device, the outer shell 100 and the hollow electrode 1
03 is insulated and fixed by welding with a first insulating layer 101 made of a cylindrical glass body formed by solidifying molten glass. By the way, when manufacturing this resistance device, a process is performed in which powdered glass is filled and then heated and melted, or a process in which molten glass is poured between the outer shell 100 and the hollow electrode 103. However, when performing this step, since the outer shell 100 and the hollow electrode 1.03 are not fixed, misalignment may occur, and the dimensions of the gap between the outer shell 100 and the hollow electrode 103 may partially differ. be. In such a case, the first insulating layer 101 formed by melting
There is a problem in that the thickness of the material differs in some parts, and the electrical insulation performance deteriorates in thinner parts. Further, the molten glass is applied to the opening 100a of the gap between the outer shell 100 and the hollow electrode 103.
In order to prevent the liquid from flowing down, the gap at the opening 100a needs to be as small as, for example, 0.3 to 0.5 mm, which makes the above-mentioned problems more likely to occur.
また、実用時において外殻１００の開口部１００ａにカ
ーボンなどが付着した場合には、外殻１００と中空電極
１０３との間の絶縁抵抗が低下し、絶縁性能が低下する
という不具合もあった。Furthermore, when carbon or the like adheres to the opening 100a of the outer shell 100 during practical use, there is also a problem in that the insulation resistance between the outer shell 100 and the hollow electrode 103 decreases, resulting in a decrease in insulation performance.
本発明はこれらの問題点に鑑みてなされたものであり、
均一で安定した電気絶縁性能を有する抵抗装置を提供す
るものである。The present invention has been made in view of these problems,
The present invention provides a resistance device having uniform and stable electrical insulation performance.
［問題点を解決するための手段］
本発明のディーゼル機関予熱栓用抵抗装置は、筒状の外
殻と、第１絶縁体層を介して外殻に挿通された筒状の中
空電極と、第２絶縁体層を介して中空電極に挿通された
中心電極と、外殻の軸線延長上に配設され両端が中空電
極および中心電極にそれぞれ電気的に接続された抵抗体
とよりなり、外殻を機関の吸気マニホルドに取付けると
ともに、抵抗体を吸気マニホルド内に突出させ抵抗体に
より予熱栓への通電電流を制御するように構成されたデ
ィーゼル機閏予熱栓用抵抗装置において、第１絶縁体層
は外殻の開口部に設けられた筒状の柔軟性絶縁体と外殻
内部に設けられた筒状のガラス体とから構成され、外殻
と中空電極とはガラス体により溶着固定されるとともに
柔軟性絶縁体の位置で外殻を径方向内方へ押圧すること
により機械的に圧着固定された構成としたことを特徴と
する。[Means for Solving the Problems] The resistance device for a diesel engine preheating plug of the present invention includes a cylindrical outer shell, a cylindrical hollow electrode inserted into the outer shell via a first insulating layer, It consists of a center electrode inserted into the hollow electrode through the second insulating layer, and a resistor disposed on the extension of the axis of the outer shell and having both ends electrically connected to the hollow electrode and the center electrode, respectively. A resistor device for a diesel engine preheating plug is configured such that a shell is attached to an intake manifold of an engine, a resistor is protruded into the intake manifold, and the resistor controls the current flowing to the preheating plug. The layer is composed of a cylindrical flexible insulator provided in the opening of the outer shell and a cylindrical glass body provided inside the outer shell, and the outer shell and the hollow electrode are fixed by welding to the glass body. The flexible insulator is also mechanically crimped and fixed by pressing the outer shell radially inward at the position of the flexible insulator.
柔軟性絶縁体は電気絶縁性能を有し、外殻を径方向内方
へ押圧する際の力で破壊されないものであれば特に制限
されない。例えばマイカ、セラミックファイバにｆｔ４
ｉｌ！塩あるいは、珪酸塩等の無機結合剤を含浸させた
ものなどから形成することができる。なお、抵抗体の発
熱に耐える耐熱性を有することが望ましい。The flexible insulator is not particularly limited as long as it has electrical insulation performance and is not destroyed by the force applied when pressing the outer shell radially inward. For example, mica, ceramic fiber with ft4
Il! It can be formed from a salt or something impregnated with an inorganic binder such as a silicate. Note that it is desirable to have heat resistance that can withstand the heat generated by the resistor.
柔軟性絶縁体は、予め筒状に形成したものを中空電極外
表面に被覆することで形成することができる。また、フ
ィルム状の柔軟性絶縁体を中空電極外表面に巻き付けて
筒状としてもよい。The flexible insulator can be formed by coating the outer surface of the hollow electrode with a cylindrical insulator formed in advance. Alternatively, a flexible insulator in the form of a film may be wrapped around the outer surface of the hollow electrode to form a cylindrical shape.
この柔軟性絶縁体は、外殻の開口部より所定長さ突出し
て中空電極表面を覆うように構成することが望ましい。This flexible insulator is preferably configured to protrude a predetermined length from the opening of the outer shell and cover the surface of the hollow electrode.
このようにすれば、実用時においてカーボンなどが付着
した場合でも、外殻と中空電極との間の絶縁抵抗を高く
維持することができる。In this way, even if carbon or the like adheres during practical use, the insulation resistance between the outer shell and the hollow electrode can be maintained high.
外殻を押圧して中空電極と圧着するには、外殻に予め薄
肉部を形成しておき、中空電極および柔軟性絶縁体を挿
通した後、その薄肉部を外周かしめすることで行なうこ
とができる。また外殻の端面に切込みかしめを施して圧
着することもできる。In order to press the outer shell and crimp it with the hollow electrode, it is possible to form a thin part in the outer shell in advance, insert the hollow electrode and flexible insulator, and then caulk the outer circumference of the thin part. can. Alternatively, the end face of the outer shell can be crimped by making a cut.
さらに、外周かしめと切込みかしめを併用してもよい。Furthermore, outer periphery caulking and incision caulking may be used together.
なお、外周かしめどは外殻の外周面を径方向中心へ向か
うように押圧してかしめる方法をいい、切込みかしめど
は、中空電極および柔軟性絶縁体を挿通した後、外殻端
面に柔軟性絶縁体の外径より大きな径で同心円状の溝を
ポンチなどで打って形成し、径方向中心へ向かう力を発
生させてかしめる方法をいう。Note that outer crimping refers to a method in which the outer circumferential surface of the outer shell is pressed toward the center in the radial direction. A method of forming concentric grooves with a punch or the like with a diameter larger than the outer diameter of the flexible insulator, and caulking by generating a force directed toward the center in the radial direction.
第１絶縁体層を構成するもう一方の要素であるガラス体
は、外殻と中空電極との間の間隙内で溶融ガラスが冷却
固化して形成されたものである。The glass body, which is the other element constituting the first insulator layer, is formed by cooling and solidifying molten glass within the gap between the outer shell and the hollow electrode.
ガラス粉末を充填した後全体を加熱してそのガラス粉末
を溶融させてもよいし、予め溶融したガラスをその間隙
に流し込むこともできる。After filling with glass powder, the entire structure may be heated to melt the glass powder, or pre-molten glass may be poured into the gap.
ガラス体を構成するガラスとしては、柔軟性絶縁体の耐
熱限界温度より溶融温度が低いものが望ましい。もし溶
融濃度が柔軟性絶縁体の耐熱限界温度より高いと、柔軟
性絶縁体が変質、劣化する場合があり、破損が生じやす
くなる。例えば柔軟性絶縁体にマイカを用いた場合には
、マイカが結晶水を失い変質する温度（耐熱限界温度）
より融点の低いガラスとして、ホウ珪酸系、ホウ酸バリ
ウム系、ホウ酸鉛系のガラス、またはホウ珪酸系のガラ
スに酸化亜鉛、酸化鉛などの融点調整剤を添加して溶融
温度を下げたガラス、などから選択して用いることがで
きる。It is desirable that the glass constituting the glass body has a melting temperature lower than the heat resistance limit temperature of the flexible insulator. If the melt concentration is higher than the heat resistance limit temperature of the flexible insulator, the flexible insulator may be altered or deteriorated, making it more likely to be damaged. For example, when mica is used as a flexible insulator, the temperature at which mica loses crystallization water and deteriorates (heat resistance limit temperature)
Glasses with lower melting points include borosilicate-based, barium borate-based, lead borate-based glasses, or glasses made by adding melting point regulators such as zinc oxide or lead oxide to borosilicate-based glasses to lower the melting temperature. , etc. can be selected and used.
中空電極、中心電極、第２絶縁体層および抵抗体などの
材質、形状は従来と同様に構成することができる。The materials and shapes of the hollow electrode, center electrode, second insulator layer, resistor, etc. can be configured in the same manner as conventional ones.
本発明の抵抗装置を製造するには、まず柔軟性絶縁体を
外殻と中空電極との間に介在させて外殻を径方向に押圧
することにより、外殻と中空電極との間の間隙を確保す
るとともに外殻、柔軟性絶縁体および中空電極を一体的
に機械的に圧着固定する。次にその間隙内でガラスを溶
融し、冷却固化させてガラス体を形成する。これにより
、外殻と中空電極とはガラス体により絶縁され、かつ溶
着固化して一体的に結合される。To manufacture the resistance device of the present invention, first, a flexible insulator is interposed between the outer shell and the hollow electrode, and the outer shell is pressed in the radial direction, thereby forming a gap between the outer shell and the hollow electrode. At the same time, the outer shell, flexible insulator, and hollow electrode are mechanically crimped and fixed together. The glass is then melted within the gap, cooled and solidified to form a glass body. As a result, the outer shell and the hollow electrode are insulated by the glass body, and are welded and solidified to be integrally coupled.
［発明の作用および効果］
本発明の抵抗装置では、第１絶縁体層は外殻の開口部に
設けられた筒状の柔軟性絶縁体と外殻内部に設けられた
筒状のガラス体とから構成され、外殻と中空電極とはガ
ラス体により溶着固定されるとともに柔軟性絶縁体の位
置で外殻を径方向内方へ押圧することにより機械的に圧
着固定された構成とされている。従って外殻と中空電極
との間の間隙の寸法は、柔軟性絶縁体の厚さで決まり、
ガラスの溶融時にはその寸法は固定されているため、従
来のようにガラス体の形成時に芯ずれが生じるような不
具合がない。また、ガラスの溶融時には、開口部は柔軟
性絶縁体で閉塞されているためガラスの流出の恐れがな
い。従って従来のように外殻と中空電極との間の間隙を
狭くする必要がなく、従来に比べて広くすることができ
る。これにより電気絶縁不良を一層防止することができ
る。[Operations and Effects of the Invention] In the resistance device of the present invention, the first insulator layer includes a cylindrical flexible insulator provided in the opening of the outer shell and a cylindrical glass body provided inside the outer shell. The outer shell and hollow electrode are welded and fixed by a glass body, and are mechanically crimped and fixed by pressing the outer shell radially inward at the position of the flexible insulator. . Therefore, the dimension of the gap between the outer shell and the hollow electrode is determined by the thickness of the flexible insulator,
Since the dimensions of the glass are fixed when it is melted, there is no problem such as misalignment during the formation of the glass body as in the past. Further, when the glass is melted, there is no risk of the glass flowing out because the opening is closed with a flexible insulator. Therefore, there is no need to narrow the gap between the outer shell and the hollow electrode as in the conventional case, and the gap can be made wider than in the conventional case. This can further prevent electrical insulation defects.
さらに、柔軟性絶縁体を外殻の開口より突出させ、中空
電極の表面を被覆するようにすれば、充分な電気絶縁長
を確保できるので、実用時にカーボンなどが付着した場
合における絶縁不良を防止することができる。Furthermore, by making the flexible insulator protrude from the opening in the outer shell and covering the surface of the hollow electrode, a sufficient electrical insulation length can be ensured, which prevents insulation failure when carbon etc. adhere to it during practical use. can do.
［実施例］
以下実施例により具体的に説明する。なお、説明の便宜
上、同様の構成の部分は各実施例とも同じ符号を付した
。[Example] The following is a concrete explanation using Examples. For convenience of explanation, parts with similar configurations are given the same reference numerals in each embodiment.
（実施例１）
第１図に本発明の一実施例のディーゼル機関予熱栓用抵
抗装置の縦断面図を示す。この抵抗装置は、略円筒状の
外殻１と、第１絶縁体層２を介して外殻１に挿通された
円筒状の中空電極３と、第２絶縁体層４を介して中空電
極３に挿通された中心電極５と、外殻１の軸線延長上に
配設された抵抗体６と、より構成されている。(Embodiment 1) FIG. 1 shows a longitudinal sectional view of a resistance device for a diesel engine preheating plug according to an embodiment of the present invention. This resistance device includes a substantially cylindrical outer shell 1, a cylindrical hollow electrode 3 inserted into the outer shell 1 through a first insulating layer 2, and a hollow electrode 3 inserted through a second insulating layer 4. It consists of a center electrode 5 inserted through the outer shell 1, and a resistor 6 disposed on the axial extension of the outer shell 1.
中空電極３はステンレス等の耐熱金属から形成されて一
端３ａが封止されている。外殻１と中空電極３との間に
は、筒状の第１絶縁体層２が介在している。The hollow electrode 3 is made of a heat-resistant metal such as stainless steel, and one end 3a is sealed. A cylindrical first insulator layer 2 is interposed between the outer shell 1 and the hollow electrode 3.
外殻１および中空電極３の間に介在する第１絶縁体層２
は、外殻１の開口部１ａの位置にマイカより形成された
柔軟性絶縁体２１と、ホウ珪酸系ガラスより形成された
ガラス体２２とよりなる。A first insulator layer 2 interposed between the outer shell 1 and the hollow electrode 3
consists of a flexible insulator 21 made of mica at the position of the opening 1a of the outer shell 1, and a glass body 22 made of borosilicate glass.
そして外殻１、第１絶縁体層２および中空電極３は、外
殻１の端部に形成された外周かしめ部１ａにより機械的
に一体的に結合されるとともに、ガラス体２２により溶
着固定されている。The outer shell 1, the first insulator layer 2, and the hollow electrode 3 are mechanically and integrally connected by the outer circumferential caulking portion 1a formed at the end of the outer shell 1, and are welded and fixed by the glass body 22. ing.
中心電極５は中空電極３内に絶縁ブツシュを介して挿通
され、ニクロムなどから形成された抵抗体６の両端が、
中空電極３内で中心電極５の先端と中空電極３の一端３
ａ内表面とにそれぞれ溶接されている。そして中心電極
５および抵抗体６と中空電極３の間には、マグネシャな
どの耐熱電気絶縁粉末が充填され第２絶縁体１１４を形
成している。The center electrode 5 is inserted into the hollow electrode 3 through an insulating bushing, and both ends of a resistor 6 made of nichrome etc.
Inside the hollow electrode 3, the tip of the center electrode 5 and one end 3 of the hollow electrode 3
(a) are welded to the inner surface. The space between the center electrode 5, the resistor 6, and the hollow electrode 3 is filled with heat-resistant electrical insulating powder such as magnesia to form a second insulator 114.
中空電極３の他端３ｂにはベークライトなどより形成さ
れた絶縁リング１０を介して金属製ワッシャ８が圧入さ
れ、中空電極３と電気的に導通されている。また中心電
極５の他端側にはナツト９が螺合している。ワッシャ８
には予熱栓に接続されるリード線が接続され、ナツト９
には電源からのリード線が接続される。これらの中心電
極５および中空電極３の他端側は、ベークライトなどよ
り形成された絶縁筒１１と金属製ワッシャ１２を介して
ナツト９で固定される。A metal washer 8 is press-fitted into the other end 3b of the hollow electrode 3 via an insulating ring 10 made of Bakelite or the like, and is electrically connected to the hollow electrode 3. A nut 9 is screwed onto the other end of the center electrode 5. Washer 8
The lead wire connected to the preheating plug is connected to the nut 9.
The lead wire from the power supply is connected to. The other ends of the center electrode 5 and the hollow electrode 3 are fixed with nuts 9 via an insulating cylinder 11 made of Bakelite or the like and a metal washer 12.
上記のように構成された抵抗装置は、中空電極３の一端
３ａが吸気マニホルド内に挿入され、外殻１が吸気マニ
ホルドに螺合することで取付けられる。そしてナツト９
に電源からのリード線を接続し、ワッシャ８と予熱栓と
を接続して通電すると、予熱栓への電流は抵抗体６で制
御されるとともに、抵抗体６が発熱するので、その熱で
ディーゼル機関への吸気が暖められ暖気性能が向上する
。The resistance device configured as described above is attached by inserting one end 3a of the hollow electrode 3 into the intake manifold and screwing the outer shell 1 into the intake manifold. And Natsuto 9
When the lead wire from the power source is connected to the washer 8 and the preheating plug is connected and energized, the current to the preheating plug is controlled by the resistor 6, and the resistor 6 generates heat. Air taken into the engine is warmed, improving warm-up performance.
本実施例の抵抗装置を作製するには、まず中心電極５お
よび中空電極３に抵抗体６を溶接し、マグネシア粉末な
どを中空電極３内に充填して第２絶縁体層４を形成する
。To manufacture the resistance device of this example, first, the resistor 6 is welded to the center electrode 5 and the hollow electrode 3, and the hollow electrode 3 is filled with magnesia powder or the like to form the second insulating layer 4.
次に、マイカから予め筒状に形成された絶縁体を中空電
極３の外周表面に被覆して柔軟性絶縁体２１を形成し、
外殻１に挿通する。外殻１には一端部に塑性変形可能な
薄肉部が形成されており、その部分を外周かしめして外
周かしめ部１ａを形成する。これにより柔軟性絶縁体２
１および中空電極３は圧縮加圧され、外殻１、柔軟性絶
縁体２１および中空電極３は電気的に絶縁された状態で
機械的に一体的に固定される。Next, a flexible insulator 21 is formed by covering the outer circumferential surface of the hollow electrode 3 with an insulator previously formed into a cylindrical shape from mica.
Insert into outer shell 1. A plastically deformable thin part is formed at one end of the outer shell 1, and the outer periphery of this part is caulked to form an outer periphery caulked part 1a. This allows the flexible insulator 2
1 and the hollow electrode 3 are compressed and pressurized, and the outer shell 1, the flexible insulator 21, and the hollow electrode 3 are mechanically fixed integrally in an electrically insulated state.
次にホウ珪酸系のガラス粉末を、外殻１、中空電極３お
よび柔軟性絶縁体２１で囲まれた間隙に充填し、約７５
０℃に加熱する。これによりガラス粉末は溶融する。こ
の時前記間隙は柔軟性絶縁体２１の厚さ分確保されて固
定されているため、芯ずれは生じない。また柔軟性絶縁
体２１を構成するマイカの耐熱温度は約８００℃以上と
高い。Next, borosilicate-based glass powder is filled into the gap surrounded by the outer shell 1, the hollow electrode 3, and the flexible insulator 21.
Heat to 0°C. This melts the glass powder. At this time, since the gap is secured by the thickness of the flexible insulator 21 and is fixed, no misalignment occurs. Furthermore, the heat resistance of mica constituting the flexible insulator 21 is as high as approximately 800° C. or higher.
従って溶融ガラスの熱によって変化することなく、柔軟
性絶縁体２１が開口部１ａを閉塞しているため、溶融ガ
ラスが開口部１ａより流出するような不具合がない。そ
して溶融ガラスが冷却固化することにより、ガラス体２
２となり、外殻１と中空電極３とに溶着して一体的に結
合する。ちなみに、このガラス体２２の厚さは１．Ｏｍ
ｍであり、従来の０．３〜Ｑ、５ｍｍに比べて大きな値
となっている。Therefore, since the flexible insulator 21 closes the opening 1a without being changed by the heat of the molten glass, there is no problem such as the molten glass flowing out from the opening 1a. As the molten glass cools and solidifies, the glass body 2
2, and is welded to the outer shell 1 and the hollow electrode 3 to be integrally coupled. By the way, the thickness of this glass body 22 is 1. Om
m, which is a larger value than the conventional 0.3 to Q, 5 mm.
その後絶縁リング１０を装着し、ワッシャ８を圧入固定
する。そして絶縁筒１１およびワッシャ１２を、ナツト
９を中心電極５に螺合することで固定して本実施例の抵
抗体は作製される。After that, the insulating ring 10 is attached, and the washer 8 is press-fitted and fixed. Then, the insulating tube 11 and washer 12 are fixed by screwing the nut 9 onto the center electrode 5, thereby producing the resistor of this embodiment.
すなわち本実施例の抵抗装置によれば、第１絶縁体層２
は所定の厚さが確保できるので安定した絶縁性能を確実
に維持できる。That is, according to the resistance device of this embodiment, the first insulator layer 2
Since a predetermined thickness can be secured, stable insulation performance can be reliably maintained.
（実施例２）
第２図に実施例２の抵抗装置を示す。この抵抗装置は、
柔軟性絶縁体２１′が開口部１ａから突出して所定長さ
１だけ中空電極３の表面を被覆していること以外は実施
例１と同様の構成である。(Example 2) FIG. 2 shows a resistance device of Example 2. This resistance device is
The structure is similar to that of the first embodiment except that the flexible insulator 21' protrudes from the opening 1a and covers the surface of the hollow electrode 3 by a predetermined length 1.
本実施例の抵抗装置の実用時の絶縁性能を調査するため
に、開口部１ａから突出している柔軟性絶縁体２１′の
表面にカーボン粉末を水で練ったペーストを約Ｑ、３ｍ
ｍの厚さ塗布し、第３図に示すように、開口部１ａの端
面Ａと柔軟性絶縁体２１−の端面Ｂとの間の絶縁抵抗を
測定した。その結果を第４図に示す。In order to investigate the insulation performance of the resistance device of this example in practical use, a paste of carbon powder kneaded with water was applied to the surface of the flexible insulator 21' protruding from the opening 1a for approximately 3 m.
The insulation resistance between the end surface A of the opening 1a and the end surface B of the flexible insulator 21- was measured as shown in FIG. The results are shown in FIG.
なお、突出している柔軟性絶縁体２１′の厚さはＱ、５
ｍｍ、内径１０ｍｍと一定とし、突出長さρを種々変化
させて同様に測定した。The thickness of the protruding flexible insulator 21' is Q, 5.
The protrusion length .rho. was kept constant at 10 mm, and the protrusion length .rho. was varied in the same manner.
第４図から明らかなように、突出長さが長くなるにつれ
て絶縁抵抗が増大し、実用時の絶縁性能の低下を防止す
ることができる。As is clear from FIG. 4, the insulation resistance increases as the protrusion length increases, and it is possible to prevent the insulation performance from deteriorating during practical use.
第１図は本発明の一実施例の抵抗装置の縦断面図、第２
図は本発明の他の実施例の抵抗装置の縦断面図、第３図
は第２図の要部説明断面図、第４図は柔軟性絶縁体の突
出長さと絶縁抵抗の関係を示すグラフ、第５図は従来の
抵抗装置の縦断面図である。
１・・・外殻 ２・・・第１絶縁体層３
・・・中空電極 ４・・・第２絶縁体層 −
５・・・中心電極 ６・・・抵抗体１ａ・・
・開口部 １ｂ・・・外周かしめ部２１・・
・柔軟性絶縁体 ２２・・・ガラス体特許出願人
日本電装株式会社FIG. 1 is a longitudinal sectional view of a resistance device according to an embodiment of the present invention, and FIG.
The figure is a longitudinal cross-sectional view of a resistance device according to another embodiment of the present invention, FIG. 3 is a cross-sectional view explaining the main part of FIG. 2, and FIG. 4 is a graph showing the relationship between the protrusion length of the flexible insulator and the insulation resistance. , FIG. 5 is a longitudinal sectional view of a conventional resistance device. 1... Outer shell 2... First insulator layer 3
...Hollow electrode 4...Second insulator layer -
5... Center electrode 6... Resistor 1a...
・Opening part 1b...Outer crimped part 21...
・Flexible insulator 22...Glass body patent applicant
Nippondenso Co., Ltd.
Claims (3)
極と、 第２絶縁体層を介して該中空電極に挿通された中心電極
と、 該外殻の軸線延長上に配設され両端が該中空電極および
該中心電極にそれぞれ電気的に接続された抵抗体と、よ
りなり、 該外殻を機関の吸気マニホルドに取付けるとともに、該
抵抗体を該吸気マニホルド内に突出させ該抵抗体により
予熱栓への通電電流を制御するように構成されたディー
ゼル機関予熱栓用抵抗装置において、 該第１絶縁体層は該外殼の開口部に設けられた筒状の柔
軟性絶縁体と該外殻内部に設けられた筒状のガラス体と
から構成され、該外殻と該中空電極とは該ガラス体によ
り溶着固定されるとともに該柔軟性絶縁体の位置で該外
殻を径方向内方へ押圧することにより機械的に圧着固定
された構成としたことを特徴とするディーゼル機関予熱
栓用抵抗装置。(1) A cylindrical outer shell, a cylindrical hollow electrode inserted into the outer shell through a first insulating layer, and a center electrode inserted into the hollow electrode through a second insulating layer. , a resistor disposed on the axial extension of the outer shell and having both ends electrically connected to the hollow electrode and the center electrode, respectively, and the outer shell is attached to the intake manifold of the engine, and the resistor In the diesel engine preheating plug resistance device, the resistance device is configured such that a body projects into the intake manifold and the resistor controls the current flowing to the preheating plug, wherein the first insulating layer is provided at the opening of the outer shell. It is composed of a cylindrical flexible insulator and a cylindrical glass body provided inside the outer shell, and the outer shell and the hollow electrode are welded and fixed by the glass body and 1. A resistance device for a diesel engine preheating plug, characterized in that the resistance device is mechanically crimped and fixed by pressing the outer shell radially inward at the body position.
点が低い特許請求の範囲第１項記載のディーゼル機関予
熱栓用抵抗装置。(2) The resistance device for a diesel engine preheating plug according to claim 1, wherein the glass body has a melting point lower than the heat resistance limit temperature of the flexible insulator.
して中空電極表面を覆つている特許請求の範囲第１項記
載のディーゼル機関予熱栓用抵抗装置。（４） 柔軟性
絶縁体はマイカまたはセラミックフアイバである特許請
求の範囲第１項記載のディーゼル機関予熱栓用抵抗装置
。(3) The resistance device for a diesel engine preheating plug according to claim 1, wherein the flexible insulator protrudes a predetermined length from the opening of the outer shell and covers the surface of the hollow electrode. (4) A resistance device for a diesel engine preheating plug according to claim 1, wherein the flexible insulator is mica or ceramic fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62258968A JP2712198B2 (en) | 1987-10-14 | 1987-10-14 | Resistance device for diesel engine preheating tap |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62258968A JP2712198B2 (en) | 1987-10-14 | 1987-10-14 | Resistance device for diesel engine preheating tap |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01102220A true JPH01102220A (en) | 1989-04-19 |
| JP2712198B2 JP2712198B2 (en) | 1998-02-10 |
Family
ID=17327519
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62258968A Expired - Lifetime JP2712198B2 (en) | 1987-10-14 | 1987-10-14 | Resistance device for diesel engine preheating tap |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2712198B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1050716A1 (en) * | 1999-05-05 | 2000-11-08 | Beru AG | Glow plug and method for producing the same |
| KR100708294B1 (en) * | 1999-05-05 | 2007-04-16 | 베루 악티엔게젤샤프트 | Glow plug and process for its manufacture |
| JP2008202285A (en) * | 2007-02-19 | 2008-09-04 | Masae Suzuki | Weeding implement for water way |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58102968U (en) * | 1981-12-28 | 1983-07-13 | 日本特殊陶業株式会社 | Two-wire glow plug |
| JPS58138922A (en) * | 1982-02-12 | 1983-08-18 | Ngk Spark Plug Co Ltd | Process for securing and sealing fixture of two-wire type glow plug with heating tube |
| JPS58206090A (en) * | 1982-05-25 | 1983-12-01 | 株式会社デンソー | Ceramic heater |
-
1987
- 1987-10-14 JP JP62258968A patent/JP2712198B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58102968U (en) * | 1981-12-28 | 1983-07-13 | 日本特殊陶業株式会社 | Two-wire glow plug |
| JPS58138922A (en) * | 1982-02-12 | 1983-08-18 | Ngk Spark Plug Co Ltd | Process for securing and sealing fixture of two-wire type glow plug with heating tube |
| JPS58206090A (en) * | 1982-05-25 | 1983-12-01 | 株式会社デンソー | Ceramic heater |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1050716A1 (en) * | 1999-05-05 | 2000-11-08 | Beru AG | Glow plug and method for producing the same |
| JP2000337633A (en) * | 1999-05-05 | 2000-12-08 | Beru Ag | Glow plug and method of production |
| US6255626B1 (en) | 1999-05-05 | 2001-07-03 | Beru Ag | Glow plug and process for its manufacture |
| KR100708292B1 (en) * | 1999-05-05 | 2007-04-16 | 베루 악티엔게젤샤프트 | Glow plug and process for its manufacture |
| KR100708294B1 (en) * | 1999-05-05 | 2007-04-16 | 베루 악티엔게젤샤프트 | Glow plug and process for its manufacture |
| JP2008202285A (en) * | 2007-02-19 | 2008-09-04 | Masae Suzuki | Weeding implement for water way |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2712198B2 (en) | 1998-02-10 |
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| EXPY | Cancellation because of completion of term |