JPS58117923A - Two-wire glow plug and its manufacture - Google Patents
Two-wire glow plug and its manufactureInfo
- Publication number
- JPS58117923A JPS58117923A JP21422381A JP21422381A JPS58117923A JP S58117923 A JPS58117923 A JP S58117923A JP 21422381 A JP21422381 A JP 21422381A JP 21422381 A JP21422381 A JP 21422381A JP S58117923 A JPS58117923 A JP S58117923A
- Authority
- JP
- Japan
- Prior art keywords
- tube
- fitting
- heating
- wire
- mounting bracket
- 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
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)
Abstract
Description
【発明の詳細な説明】
本発明は内燃機関の予熱に用いるための二線式グロープ
ラグに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a two-wire glow plug for use in preheating an internal combustion engine.
先端が閉じた金属性製シーズチューブ内に棒状中心電極
を挿入し、該中心電極先端と命記シーズチューブ底との
闇を発熱線で接続し、前記シーズチューブ内に絶縁材を
充填して前記中心電極および発熱線を固定してなる発熱
チューブを、中空の取付金具内に同軸的に挿貫するとと
もに電気的に絶縁した状態で固着してなる二線式グロー
プラグが存在するが、従来品は第１図に示す如く、取付
金具１の先端にテーパ一部１１を形成し、発熱チュラミ
ックまたはガラスのコーテング層４０を付着させ、取付
金具１との絶縁を行うと共に取付金具の後端がわにセラ
ミック粉末５０を充填して取付金具と発熱チューブとの
シールを行っており、前記外筒３０のテーパー面は取付
金具１のテーパー面に圧接されるｔこめ取付金具１と発
熱チコーブ２どの抜は防止は確実になされるが、上記コ
ーテング層１４０が剥離したりひび割れしたり絶縁不良
が生じやすく、またコーテング＠４０と取付金員１の内
周面とは圧接されているだけで接着されていないことに
より機関内のガスがセラミック粉末の端内まで到達しや
すく、気密保持が不充分であった。さらに部品点数が多
く組付加工が面倒でコスト高になる欠点があった。A rod-shaped center electrode is inserted into a metal sheath tube with a closed tip, the tip of the center electrode and the bottom of the sheath tube are connected with a heating wire, and the sheath tube is filled with an insulating material. There are two-wire glow plugs in which a heating tube with a fixed center electrode and heating wire is inserted coaxially into a hollow mounting bracket and fixed in an electrically insulated state, but conventional products As shown in FIG. 1, a tapered part 11 is formed at the tip of the mounting bracket 1, and a heat-generating coating layer 40 of tunic or glass is attached to insulate the mounting bracket 1, and the rear end of the mounting bracket is warped. The tapered surface of the outer cylinder 30 is pressed against the tapered surface of the mounting fitting 1 by filling it with ceramic powder 50 to seal the fitting and the heating tube. Although this can be reliably prevented, the coating layer 140 is likely to peel off, crack, or cause insulation failure, and the coating @ 40 and the inner circumferential surface of the mounting bracket 1 are only pressed together and are not bonded together. As a result, gas within the engine easily reached the edges of the ceramic powder, resulting in insufficient airtightness. Furthermore, there is a drawback that the number of parts is large, making assembly difficult and increasing costs.
本発明の目的は、取付金具と発熱チューブとの嵌着面の
シールお八び電気的絶縁が強固にできるとともに、加工
および組付が簡単で１ｍｌ″ｌｂコストが低減できる二
線式グロープラグの提供にある。The object of the present invention is to provide a two-wire glow plug that can provide a strong seal and electrical insulation between the fitting surface of the mounting bracket and the heating tube, is easy to process and assemble, and can reduce the cost by 1ml. It's on offer.
つぎに本発明を第２図および第３図に基づき説明する。Next, the present invention will be explained based on FIGS. 2 and 3.
１は外周に機関への取付ねじ１２が形成され、先端がね
内周１３がテーパー状に拡大された筒状取イ・Ｊ金具、
２は発熱チューブであり、先端２１Ａが閉じるとともに
後部２１Ｂは取付金具内径より小さい外形を有し、先端
がわ部２１Ｃは取付金具内径より幾分大きい外形を有し
、大外径の先端がわから後部に連なる部分２１Ｄは前記
取付金具の先端がね内周１３に対応するテーパー状に形
成された耐熱金属性のシーズチューブ２１の中心に、金
属−中心電極２２を挿設し、その先端２２Ａと前記シー
ズチューブ２１の底！！２１Ｅとの間にニクロム線を螺
巻した発熱線２３を溶接して接続し、シーズチューブ２
１内に前記中心電極２２および発熱線２３を固定するた
め、マグネシア、アル徒す、ベリリアはどの電気絶縁性
セラミック粉末２４が加圧状態で充填され、さらにその
開口がね端にはガラスシース２５が施されて形成されて
いる。前記取付金具１と発熱チ】−７２との表着は、発
熱チューブ２を取付金具１の中心に挿貫すると共に、心
出しをしながら取付金具１の内周壁と発熱チューブ２の
外周１ｌＩｌｌＩの環状間隙４にガラスシール材５を充
填し、しかる後加熱して該ガラスシール材５を溶融させ
ることによりなされる。前記環状間隙４が狭いときは、
ペースト状にしたガラスシール材を発熱チューブ外周譬
または取付金具の内周壁に塗付してから両者を嵌合して
もよく、さらには環状間隙にガススバイブを嵌め込む方
法によってもよい。６はシーズチュー１の後端外因に圧
入またはろう付けされたリング状端子、７は端子６と取
付金具１の後端面１４との闇に介在された樹脂製絶縁リ
ングである。1 is a cylindrical handle A/J fitting with a mounting screw 12 formed on the outer periphery and an inner periphery 13 of the tip enlarged in a tapered shape;
2 is a heat-generating tube, and the tip 21A is closed, the rear part 21B has an outer diameter smaller than the inner diameter of the mounting bracket, and the tip end portion 21C has an outer diameter somewhat larger than the inner diameter of the mounting bracket, so that the tip with the large outer diameter can be seen. In the portion 21D connected to the rear part, a metal center electrode 22 is inserted into the center of a heat-resistant metal sheath tube 21 formed in a tapered shape corresponding to the inner circumference 13 of the mounting bracket, and the metal center electrode 22 is connected to the tip 22A. The bottom of the sheath tube 21! ! 21E by welding and connecting the heating wire 23 made of spirally wound nichrome wire to the sheath tube 2.
In order to fix the center electrode 22 and the heating wire 23 inside the opening, an electrically insulating ceramic powder 24 such as magnesia, aluminum or beryllia is filled under pressure, and a glass sheath 25 is placed at the end of the opening. It is formed by applying. To attach the above-mentioned mounting bracket 1 and the heating tube 1-72, insert the heating tube 2 into the center of the mounting bracket 1, and while aligning the inner wall of the mounting bracket 1 and the outer circumference 1lIllI of the heating tube 2. This is done by filling the annular gap 4 with a glass sealing material 5 and then heating it to melt the glass sealing material 5. When the annular gap 4 is narrow,
A paste-like glass sealing material may be applied to the outer periphery of the heating tube or the inner periphery of the mounting bracket, and then the two may be fitted together, or a gas vibrator may be fitted into the annular gap. 6 is a ring-shaped terminal press-fitted or brazed to the rear end of the sheath chew 1, and 7 is a resin insulating ring interposed between the terminal 6 and the rear end surface 14 of the mounting bracket 1.
第３図は他の実施例を示し、本実施例ではシーズチーブ
２１の先端がわと後部と閣を段部２６で連続させており
、取付金具１の内周壁には前記段部２６に対応す段１５
を介して前記シーズチーブ２１の先端がね外径より幾分
大きい内径を有する先端がね大内径５ｇ１Ｂが形成され
ている。FIG. 3 shows another embodiment. In this embodiment, the tip, rear, and cabinet of the sheathed cheese 21 are continuous with a stepped portion 26, and the inner circumferential wall of the mounting bracket 1 has a wall corresponding to the stepped portion 26. Step 15
A large inner diameter 5g1B is formed at the distal end of the sheathed tube 21, which has an inner diameter somewhat larger than the outer diameter of the distal end.
本発明の二線式グロープラグはつどのように顎造される
。The two-wire glow plug of the present invention is constructed in the usual manner.
Ｉｊ１％４図八に示すへく一端（先端）が絞られたシー
ズチューブ材１２１の中心に、先端２２Ａに発熱線２３
の一端が溶接され、さらに該発熱線２３の他端に鋲２６
が溶接された中心電極２２を挿入し、前記鋲２６をシー
ズチューブ材の先端穴２６Ａに嵌め込んで、シーズチュ
ーブ材底壁に溶接する。つぎにシーズチューブ材内にセ
ラミック粉末２４及び開口にガラスシール材２５を充填
し、シーズチューブ材の外径をしばり、第４図Ｂに示す
如くまず全体を同一径にしばり、つぎにスウェージング
加工により後部を前記取付金具の内径より所定寸法だけ
小さい外径にしぼる。これにより第４図Ｃに示す如く先
端がわが大内径のシーズチューブが形成されるとともに
内部のセラミック粉末が強固に加圧される。Ij1%4 At the center of the sheathed tube material 121 with one end (tip) shown in FIG.
One end is welded, and a stud 26 is attached to the other end of the heating wire 23.
The center electrode 22 to which is welded is inserted, and the stud 26 is fitted into the tip hole 26A of the sheath tube material and welded to the bottom wall of the sheath tube material. Next, the sheath tube material is filled with ceramic powder 24 and the opening is filled with glass sealing material 25, and the outer diameter of the sheath tube material is tightened. As shown in FIG. The outer diameter of the rear portion is reduced by a predetermined dimension smaller than the inner diameter of the mounting bracket. As a result, a sheath tube with a large inner diameter at the tip is formed as shown in FIG. 4C, and the ceramic powder inside is firmly pressurized.
つぎに第４図りの如くシーズチューブ全体を加熱して加
工歪を除去すると共に開口部分のガラスシール材２５を
溶融してシールし、発熱チューブ２を製造する。つぎに
発熱チューブ２にリング状端子６を圧嵌するとともに絶
縁リング７を嵌め、第２図に示す如く取付金具１内に挿
入するとともに環状ｍ隙４にガラスシール材を充填して
加熱しガラスシール材を溶融させて両者を固＠するとと
もに間隙をシールする。Next, as shown in the fourth diagram, the entire sheath tube is heated to remove processing distortion, and the glass sealing material 25 at the opening is melted and sealed, thereby manufacturing the heat generating tube 2. Next, the ring-shaped terminal 6 is press-fitted into the heat-generating tube 2, and the insulating ring 7 is also fitted, and as shown in FIG. The sealing material is melted to solidify the two and seal the gap.
以上の如く本発明の二線式グロープラグは取付金具への
嵌着時に対応する前記取付金具後端の内径より幾分小さ
い外径を有する後部と、前記取付金具の後部内径より大
ぎい外径を有する先端がわ部とからなり、前記取付金具
は、先端がわに前記シーズチューブの先端がね部の外径
より幾分大きい内径を有（る大内径部を有し、発熱チュ
ーブと取付金員との嵌着は発熱チューブを取付金具の軸
心に挿入すると共に両者の環状間隙をガラスシールして
なるので取付金具と発熱チューブとの嵌着面のシールお
よび電気的絶縁が強固にできる。また一端が閉じたパイ
プ状のシーズチューブ材に、先端に発熱線の一端を固着
した中心電極を挿入すると共に、該発熱線の他端をシー
ズチューブ材の底壁に固着し、つぎにシーズチューブ材
内にセラミック粉体を充填して前記中心電極と発熱線と
をシーズチューブ材内の中心に保持しながらシーズチュ
ーブ材全体をしぼって所定の外径に形成し、さらに咳し
ぼられたシーズチューブの後部をスウエージング加工に
よりしばって所定の外径に形成し、先端がわが太く後部
が細い発熱チューブを製造し、該発熱チューブを該発熱
チューブの外径に対応する内周に形成した中空の取付金
具内に同軸的に挿入い両者の環状間隙にガラスシール材
を充填し、加熱してガラスシール材を溶融して両者を電
気的に絶縁した状態で固着すると共に嵌着面のシールを
行っているのでシーズチューブの抜けが防止され、且つ
加工および組付が簡単で製造コストが低減できる。As described above, the two-wire glow plug of the present invention has a rear part that has an outer diameter somewhat smaller than the inner diameter of the rear end of the mounting bracket when fitted to the mounting bracket, and a rear part that has an outer diameter that is slightly larger than the inner diameter of the rear end of the mounting bracket. The mounting bracket has a large inner diameter section at the distal end, which is somewhat larger than the outer diameter of the distal end section of the sheath tube, and the mounting bracket has a large inner diameter section at the distal end, which is suitable for mounting the heat generating tube. Fitting with the metal member is achieved by inserting the heat generating tube into the axis of the mounting bracket and sealing the annular gap between the two with glass, thereby ensuring strong sealing and electrical insulation between the fitting surface of the mounting bracket and the heat generating tube. In addition, a center electrode with one end of a heat-generating wire fixed to the tip is inserted into a pipe-shaped sheathed tube with one end closed, and the other end of the heat-generating wire is fixed to the bottom wall of the sheathed tube. The tube material is filled with ceramic powder, and the center electrode and heating wire are held at the center of the sheath tube material, and the entire sheath tube material is squeezed to have a predetermined outer diameter. The rear part of the tube is tightened by swaging process to form it to a predetermined outer diameter to produce a heat generating tube with a thick tip and a thin rear part, and the heat generating tube is formed into a hollow tube with an inner circumference corresponding to the outer diameter of the heat generating tube. Coaxially inserted into the mounting bracket, the annular gap between the two is filled with glass sealing material, and heated to melt the glass sealing material and secure the two in an electrically insulated state, as well as sealing the fitting surface. This prevents the sheath tube from coming off, and it is easy to process and assemble, reducing manufacturing costs.
第１１％ｌｌは従来の二線式グロープラグの断面図、第
２図は本発明の二線式グロープラグの断面図、第３図は
本発明の他の二線式グロープラグの断面図、第４図Ａ〜
Ｏは本発明の二線式グロープラグの製造工程図である。
１・・・取付金具、２・・・発熱チューブ、４・・・ガ
ラスシール
第１図 第２１・〈；
２１Ａ
任、４１．＝１11%ll is a sectional view of a conventional two-wire glow plug, FIG. 2 is a sectional view of a two-wire glow plug of the present invention, and FIG. 3 is a sectional view of another two-wire glow plug of the present invention. Figure 4 A~
0 is a manufacturing process diagram of the two-wire glow plug of the present invention. 1...Mounting bracket, 2...Heating tube, 4...Glass seal Fig. 1 Fig. 21. =1
Claims (1)
電極を挿入し、該中心電極先端と前記シーズチューブ底
との藺を発熱線で接続し、前記シーズチューブ内に絶縁
材を充填して前記中心電極および発熱線を固定してなる
発熱チューブを、中空の取付金具内に同軸的に挿置する
とともに電気的に絶縁した状態で固着してなる二線式グ
ロー−プラグにおいて、 前記発熱チューブのシーズチューブは、取付金具への嵌
着時に対応する前記取付金具後端の内径より幾分小さい
外径を有する後部と、前記取付金具の後部内径より大き
い外径を有する先端がね部とからなり、前記取付金具は
、先端がわに前記シーズチューブの先端がね部の外径よ
り幾分大きい内径をｈする大内径部を有し、発熱チ】−
ブと取イ（金具との嵌着は発熱チューブを取付金具の軸
心に挿入すると共に両者の環状［１１１をガラスシール
してなることを特徴とする二線式グロープラグ。 ２）一端が閉じたパイプ状のシーズデユープ材に、先端
に発熱線の一端を固着した中心電極を挿入すると共に、
該発熱線の他端をシーズチューブ材の底壁に固着し、つ
ぎにシーズチューブ材内にセラミック粉体を充填して前
記中心電極と発熱線とをシーズチューブ材内の中心に保
持しながらシーズチューブ材全体をしばって所定の外径
に形成し、さらに該しばられたシーズチューブの後部を
スウエージング加工によりしぼって所定の外径に形成し
、先端がわが太く後部が細い発熱チコープを報造し、咳
発熱チューブを該発熱チューブの外径に対応する内周に
形成した中空の取付金具内に同軸的に挿入し、両者の環
状間隙にガラスシール材を充填し、加熱してガラスシー
ル材を溶融して両者を電気的に絶縁した状態で固着する
と共に嵌＠而のシールを行うことを特徴とする二線式グ
ローブ−フグ。[Claims] 1) A rod-shaped center electrode is inserted into a metal sheath tube with a closed tip, the tip of the center electrode and the bottom of the sheath tube are connected with a heating wire, and the electrode is inserted into the sheath tube. A two-wire glow lamp in which a heating tube filled with an insulating material and fixing the center electrode and heating wire is coaxially inserted into a hollow mounting bracket and fixed in an electrically insulated state. In the plug, the sheath tube of the heating tube has a rear portion having an outer diameter somewhat smaller than the inner diameter of the corresponding rear end of the fitting when fitted to the fitting, and an outer diameter larger than the rear inner diameter of the fitting. The mounting bracket has a large inner diameter part on the distal end, which has an inner diameter somewhat larger than the outer diameter of the distal end of the sheath tube, and the mounting bracket has a large inner diameter part on the distal end thereof, and has a heat-generating tip.
A two-wire glow plug that is fitted with a metal fitting by inserting a heating tube into the axis of the fitting and sealing the annular part [111] of both with glass. 2) One end is closed. Insert a center electrode with one end of the heating wire fixed to the tip into the pipe-shaped sheathed duplex material, and
The other end of the heating wire is fixed to the bottom wall of the sheathed tube material, and then the sheathed tube material is filled with ceramic powder and the sheathed tube is held while the center electrode and the heating wire are held at the center of the sheathed tube material. The entire tube material is tied to form a predetermined outer diameter, and the rear part of the tied sheath tube is further squeezed by swaging to form a predetermined outer diameter. The cough fever tube is coaxially inserted into a hollow fitting formed on the inner periphery corresponding to the outside diameter of the fever tube, the annular gap between the two is filled with a glass sealing material, and the glass is sealed by heating. A two-wire glove-puffer characterized by melting materials and fixing the two in an electrically insulated state, as well as performing a fitting seal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21422381A JPS58117923A (en) | 1981-12-28 | 1981-12-28 | Two-wire glow plug and its manufacture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21422381A JPS58117923A (en) | 1981-12-28 | 1981-12-28 | Two-wire glow plug and its manufacture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58117923A true JPS58117923A (en) | 1983-07-13 |
Family
ID=16652237
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21422381A Pending JPS58117923A (en) | 1981-12-28 | 1981-12-28 | Two-wire glow plug and its manufacture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58117923A (en) |
-
1981
- 1981-12-28 JP JP21422381A patent/JPS58117923A/en active Pending
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