JPS58115224A - Two-line glow plug - Google Patents
Two-line glow plugInfo
- Publication number
- JPS58115224A JPS58115224A JP21422681A JP21422681A JPS58115224A JP S58115224 A JPS58115224 A JP S58115224A JP 21422681 A JP21422681 A JP 21422681A JP 21422681 A JP21422681 A JP 21422681A JP S58115224 A JPS58115224 A JP S58115224A
- Authority
- JP
- Japan
- Prior art keywords
- tube
- sheath tube
- metal pipe
- pipe
- glow plug
- 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.
先端が閉じた金属製のシーズチューブ内に棒状中心電極
を挿入し、該中心電極先端と前記シーズチューブ底との
間を発熱線で接続し、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。従来品は第１図に示す如く、取付金
具１と発熱チューブ２との環状間隙４にガラスシール材
５を充填し、加熱して該ガラスシール材を溶融し融着し
て形成されていたが、かかるガラスシールによって絶縁
を施した二線式グローブラグに於いては、発熱チューブ
２は通常ステンレス鋼（たとえば５ＵＳ３１０Ｓ、イン
コネル６００など）で熱膨張係数が１６０〜１６５ （
ｘ １０／ Ｃ以下同じ）であるのに対し、ガラスの熱
膨張係数は５０〜１１０程度であるため高温と低温のく
り返し使用による熱膨張差で経時的に接合面が剥離し、
シール不良が生じやすい。このシール不良の防止は第２
図に示す如く発熱チューブ２とガラスシール５との間に
両者の中間の熱膨張係数を有する金属パイプ３（たとえ
ば熱膨張係数が１１０程度の５ＵＳ４０３．５ＵＳ４１
０など）を発熱チューブに加締めて介在させることで防
止できるが、通常のロール加締めによると発熱チューブ
と金属パイプとの完全な気密が得られない。 本発明の
目的は、かかる金属パイプと発熱チューブとの気密が確
実に保持でき且つガラスシールとの接合面との剥離も防
止できる二線式グロープラグの提供にある。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 an insulating material is filled in the sheath tube to remove the center electrode. 2. Description of the Related Art There is a two-wire glow plug in which a heat-generating tube having fixed electrodes and a heat-generating wire is coaxially inserted into a hollow fitting and fixed in an electrically insulated state. As shown in Fig. 1, the conventional product was formed by filling the annular gap 4 between the mounting bracket 1 and the heating tube 2 with a glass sealing material 5, and heating it to melt and fuse the glass sealing material. In a two-wire globe lug insulated by such a glass seal, the heating tube 2 is usually made of stainless steel (for example, 5US310S, Inconel 600, etc.) with a coefficient of thermal expansion of 160 to 165 (
x 10/C or less), whereas the coefficient of thermal expansion of glass is about 50 to 110, so the bonded surface will peel off over time due to the difference in thermal expansion due to repeated use at high and low temperatures.
Seal failure is likely to occur. Prevention of this seal failure is the second step.
As shown in the figure, a metal pipe 3 having a thermal expansion coefficient intermediate between the heat generating tube 2 and the glass seal 5 (for example, 5US403.5US41 having a thermal expansion coefficient of about 110) is placed between the heat generating tube 2 and the glass seal 5.
0, etc.) can be prevented by intervening the heat generating tube by crimping it, but with normal roll crimping, complete airtightness between the heat generating tube and the metal pipe cannot be obtained. An object of the present invention is to provide a two-wire glow plug that can reliably maintain airtightness between the metal pipe and the heating tube, and can also prevent separation from the joint surface with the glass seal.
つぎに本発明を第３図に基づき説明する。Next, the present invention will be explained based on FIG.
１は外周に機関への取付ねじ１２が形成されれた中空の
取付金具、２は発熱チコーブであり、先端２１△が閉じ
前記取付金具の内径より幾分小さい外径を有するステン
レス鋼（ＳＵＳ３１ Ｏ８）製のシーズチューブ２１の
中心に金属製中心電極２２を挿設し、その先端２２Ａと
前記シーズチューブ２１の底壁２１３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２１内に前記中心電極２２Ｊ５よび発熱線２３を固
定するためマグネシア、アルミナ、ベリリアなどの電気
絶縁性セラミック粉末２４がが充加圧状態で充填され、
その端はガラスシール２５により保持され形成されてい
る。シーズチューブ２１の外周には５ＵＳ４０３製のパ
イプ３が外嵌され、該パイプ３の嵌首部を含むシーズチ
ューブ２１の後端がわはスウエージング加工により外径
がしぼられて、金属パイプ３の外径が取付金具１の内周
壁の内径より所定寸法だけ小径とされている。このスウ
エージング加工によりシーズチューブ２１の外周と金属
パイプ３の内周とは全幅にわたり強固に密着され完全に
気密となる。前記取付金具１と発熱チューブ２との嵌着
は、発熱チューブ２を取付金具１の中心に挿貫するとと
もに芯出しをしながら取付金具１の内周壁と発熱チュー
ブ２に外嵌された金属パイプ３の外周壁間の環状間隙４
の先端がわ部にガラスシール材５を充填ししかる後加熱
して該ガラスシール材５を溶融させシーズチューブ２１
外周壁と取付金具内周壁とを接着してなされる。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壁または取付金具内周壁に塗布して
から両者を嵌合してもよく、さらにはガラスパイプを嵌
め込む方法によってもよい。６はシーズチューブの後端
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後端而１４との間に介在された樹脂製絶縁
リングである。1 is a hollow mounting bracket with a mounting screw 12 formed on the outer periphery for mounting on the engine; 2 is a heat-generating chicob made of stainless steel (SUS31 O8) with a closed tip 21△ and having an outer diameter somewhat smaller than the inner diameter of the mounting bracket; A metal center electrode 22 is inserted into the center of a sheath tube 21 made of ), and a heating wire 23 made of a spirally wound nichrome wire is welded and connected between its tip 22A and the bottom wall 213 of the sheath tube 21. In order to fix the center electrode 22J5 and the heating wire 23 in the sheath tube 21, electrically insulating ceramic powder 24 such as magnesia, alumina, beryllia, etc. is filled under pressure.
Its ends are held and formed by glass seals 25. A pipe 3 made of 5US403 is fitted around the outer periphery of the sheath tube 21 , and the outer diameter of the rear end of the sheath tube 21 , including the fitting neck of the pipe 3 , is reduced by swaging to reduce the outer diameter of the metal pipe 3 . The diameter is smaller than the inner diameter of the inner peripheral wall of the mounting bracket 1 by a predetermined dimension. Through this swaging process, the outer periphery of the sheath tube 21 and the inner periphery of the metal pipe 3 are tightly adhered to each other over the entire width, making them completely airtight. The fitting between the mounting bracket 1 and the heat generating tube 2 is carried out by inserting the heat generating tube 2 into the center of the mounting bracket 1 and aligning the metal pipe fitted onto the inner peripheral wall of the mounting bracket 1 and the outside of the heat generating tube 2. An annular gap 4 between the outer peripheral walls of 3
Fill the tip of the sheath tube 21 with a glass sealant 5, and then heat it to melt the glass sealant 5.
This is done by gluing the outer peripheral wall and the inner peripheral wall of the mounting bracket. When the annular gap 4 is narrow, a paste-like glass sealing material may be applied to the outer circumferential wall of the heat generating tube or the inner circumferential wall of the mounting bracket, and then the two may be fitted together. Furthermore, a method may be employed in which a glass pipe is fitted. . 6 is a ring-shaped terminal press-fitted or brazed to the rear end of the sheath tube, 7 is the terminal 6
This is a resin insulating ring interposed between the mounting bracket 1 and the rear end 14 of the mounting bracket 1.
第４図（イ）〜（ニ）は本発明の二線式グロープラグの
製造工程を示す。FIGS. 4(a) to 4(d) show the manufacturing process of the two-wire glow plug of the present invention.
第４図（イ）に示す如く一端（先端）がしぼられたシー
ズチューブ材２０に金属パイプ３０を外嵌５−
し、両者の嵌合面の両端ＡまたはＢのどちらか１箇所を
溶接で止めるかあるいは第４図（ロ）に示す如く金属パ
イプ３０の外周からロールが締めＣ１０を施す方法等で
金属パイプ３０とシーズチューブ材２０とを仮一体化す
る。つぎに第４図（ハ）に示す如く中心電極２２、コイ
ル状発熱線２３、鋲２６をそれぞれ溶接で接続した中軸
アセンブリー１０を図の様に組込み、鋲２６をシーズチ
ューブ材２０の先端穴２８に嵌め、両者を溶接する。さ
らにシーズ−チューブ材２０内へ絶縁セラミック粉末２
４を充填する。As shown in Fig. 4(A), a metal pipe 30 is externally fitted onto the sheathed tube material 20 with one end (tip) squeezed, and either one of the ends A or B of the fitting surfaces of the two is welded. The metal pipe 30 and the sheath tube material 20 are temporarily integrated by clamping them together or by tightening C10 with rolls from the outer periphery of the metal pipe 30 as shown in FIG. 4(b). Next, as shown in FIG. 4(c), the center shaft assembly 10 in which the center electrode 22, coiled heating wire 23, and stud 26 are connected by welding is assembled as shown in the figure, and the stud 26 is inserted into the tip hole 28 of the sheathed tube material 20. and weld them together. Furthermore, the insulating ceramic powder 2 is introduced into the sheath tube material 20.
Fill 4.
しかるのちスウェージング加工にて第４図（ニ）の如く
シーズチューブ材２０と金属パイプ３０の外径を絞り加
工し、つぎにシーズチューブ２１の開口がわにガラスシ
ール２５を施す。（パイプ外径はシーズチューブの先端
がわ部外径と同一外径にしぼる。Thereafter, the outer diameters of the sheath tube material 20 and the metal pipe 30 are reduced by swaging as shown in FIG. 4(d), and then a glass seal 25 is applied to the opening of the sheath tube 21. (The outer diameter of the pipe should be the same as the outer diameter of the tip of the sheath tube.
）この時点で金属パイプとシーズチューブとの間のシー
ルは完全になされる。この後第３図に示す如く金属パイ
プ３と取付金具１との間隙４にガラスシールを行う。) At this point the seal between the metal pipe and the sheath tube is complete. Thereafter, as shown in FIG. 3, a glass seal is applied to the gap 4 between the metal pipe 3 and the fitting 1.
６−
以上の如く本発明の二線式グロープラグは、前記発熱チ
ューブと取付金具とは、シーズチューブに該シーズチュ
ーブ材とガラスシール材との中間の熱膨張係数を有する
金属パイプを外嵌するとともに該金属パイプとともにシ
ーズチューブの金属パイプ嵌着部をスウエージング加工
によりしぼり該しぼり加工した金属パイプ外周部と取付
金具の内周壁との環状間隙の先端がわ部をガラスシール
により固着されているので、金属パイプと発熱チューブ
との気密がが確実に保持でき且つガラスシールとの接合
面との剥離が防止できる。6- As described above, in the two-wire glow plug of the present invention, the heat generating tube and the mounting fitting include a metal pipe having a thermal expansion coefficient intermediate between that of the sheath tube material and the glass seal material, which is fitted around the sheath tube. At the same time, the metal pipe fitting part of the sheath tube is squeezed together with the metal pipe by swaging processing, and the tip end of the annular gap between the swaged outer peripheral part of the metal pipe and the inner peripheral wall of the mounting bracket is fixed with a glass seal. Therefore, airtightness between the metal pipe and the heating tube can be maintained reliably, and separation from the joint surface with the glass seal can be prevented.
第１図は従来の二線式グロープラグの断面図、第２図は
従来の他の二線式グロープラグの断面図、第３図は本発
明の実施例を示す二線式グロープラグの断面図、第４図
（イ）〜（ニ）はその製造工程図である。
１・・・取付金具、２・・・発熱≠ユ゛−ブ、３・・・
金属パイプ、４・・・ガラスシール
７−
第４図
イ
ハ
特許庁長官 殿１．事件の表示
昭和５６年特許願第２１４２２６＠２、発明の名称
二線式グロープラグ
３、補正をする者
事件との関係 特許出願人
住 所 名古屋市瑞穂区高辻町１４番１８号氏 名
日本特殊陶業株式会社
（４５４）代表者 小 川 修 次
４、代理人〒４６５電話０５２−７７３−２４４９６、
補正の対象
明細書全文。
７、補正の内容 別紙の通り。
明細書
１、発明の名称
二線式グロープラグ
２、特許請求の範囲
１）先端が閉じた金属製のシーズデユープ内に棒状中心
電極を挿入し、該中心電極先端と前記シーズチューブ底
との間を発熱線で接続し、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、中空の取イ」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
グロープラグにおいて、
前記発熱チューブと取付金具とは、シーズデユープに該
シーズチューブ材とガラスシール材との中間の熱膨張係
数を有する金属パイプを外嵌づるとともに該金属パイプ
とともにシーズチューブの金属パイプ嵌着部をスウエー
ジング加工によりしぼり該しぼり加工した金属パイプ外
周部と取付金具の内周壁との環状間隙の先端がわ部をガ
ラスシールにより固着しｌこことを特徴とする二線式グ
ロープラグ。
３、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。
先端が閉じた金属製のシーズチューブ内に棒状中心電極
を挿入し、該中心電極先端と前記ジ−ズブコープ底との
間を発熱線で接続し、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。（例えば実公昭４５−４０８９号公
報参照）従来品は第１図に示す如く、取付金具１と発熱
チューブ２との環状間隙４にガラスシール材５を充填し
、加熱して該ガラスシール材を溶融し融着して形成され
ていたが、かかるガラスシールによつ２−
て絶縁を施した二線式グロープラグに於いては、発熱チ
ューブ２は通常ステンレス鋼（たとえば５ＵＳ３１０Ｓ
、インコネル６００など）で熱膨張係数が１６０〜１６
５ （Ｘ １０′）℃以下間じ）であるのに対し、ガラ
スの熱膨張係数は５０〜１１０程度であるため高温と低
温のくり返し使用による熱膨張差で経時的に接合面が剥
離し、シール不良が生じやすい。
このシール不良の防止は第２図に示す如く発熱チューブ
２とガラスシール５との間に両者の中間の熱膨張係数を
有する金属パイプ３（たとえば熱膨張係数が１１０程度
の５ＵＳ４０３．５ＵＳ４１０など）を発熱チューブに
加締めて介在させることで防止できるが、通常のロール
加締めによると発熱チューブと金属パイプとの完全な気
密が得られない。
本発明の目的は、かかる金属パイプと発熱チューブとの
気密が確実に保持でき且つガラスシールとの接合面との
剥離も防止できる二線式グロープラグの提供にある。
つぎに本発明を第３図に基づぎ説明する。
３−
１は外周に機関への取付ねじ１２が形成されれた中空の
取付金具、２は発熱チューブであり、先端２１Δが閉じ
前記取付金具の内径より幾分小さい外径を有するステン
レスＩ （ＳＵＳ３１ Ｏ３）製のシーズチューブ２１
の中心に金属製中心電極２２を挿設し、その先端２２Ａ
と前記シーズチューブ２１の底壁２１Ｂ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２１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、アルミナ、ベリリアなどの電気
絶縁性セラミック粉末２４がが充加圧状態で充填され、
その端はガラスシール２５により保持され形成されてい
る。シーズデユープ２１の外周には５ＵＳ４０３製のパ
イプ３が外嵌され、該パイプ３の嵌首部を含むシーズチ
ューブ２１の後端がわはスウエージング加工により外径
がしぼられて、金属パイプ３の外径が取付金具１の内周
壁の内径より所定寸法だけ小径とされている。このスウ
エージシグ加工によりシーズチューブ２１の外周と金属
パイプ３の内周とは全幅にわたり強固に密着され完全に
気密となる。前記取付金具１と発熱チューブ２との嵌着
は、発熱チューブ２を取イ」金具１の中心に挿貫すると
ともに芯出しをしながら取付金具１の内周壁と発熱チュ
ーブ２に外嵌された金属パイプ３の外周壁間の環状間隙
４の先端がわ部にガラスシール材５を充填ししかる後加
熱して該ガラスシール材５を溶融させシーグチ１−ブ２
１外周壁と取イ」金具内周壁とを接着してなされる。前
記環状間隙４が狭いとぎはペース１へ状にしたガラスシ
ール材を発熱チューブ外周壁または取付金具内周壁に塗
イ５してから両者を嵌合してもよく、ざらにはガラスパ
イプを嵌め込む方法によってもよい。６はシーズチュー
ブの後端に圧入またはろう何けされたリング状端子、７
は端子６と取付金具１後端面１４との間に介在された樹
脂製絶縁リングである。
第４図（イ）ヘ−（ニ）は本発明の二線式グロープラグ
の製造工程を示す。
第４図（イ）に示す如く一端（先端）がしぼられたシー
ズチューブ材２０に金属パイプ３０を外嵌し、両者の嵌
合面の両端ＡまたはＢのどちらか１箇所を溶接で止める
かあるいは第４図（ロ）に示す如く金属パイプ３０の外
周からロールか締めＣ１Ｄを施寸方法等で金属パイプ３
０とシーズチューブ材２０とを仮一体化する。つぎに第
４図（ハ）に示す如く中心電極２２、コイル状発熱線２
３、鋲２Ｇをそれぞれ溶接で接続した中軸アセンブリー
１０を図の様に組込み、鋲２Ｇをシーズチューブ材２０
の先端穴２８に嵌め、両者を溶接する。さらにシーズ−
チューブ材２０内へ絶縁セラミック粉末２４を充填する
。
しかるのちスウエージング加工にて第４図（ニ）の如く
シーズデユープ材２０と金属パイプ３０の外径を絞り加
工し、つぎにシーズチューブ２１の開口がわにガラスシ
ール２５を施す。（パイプ外径はシーズチューブの先端
がね部外径と同一外径にしぼる。
）この時点で金属パイプどシーズチューブとの間のシー
ルは完全になされる。この後第３図に示す如く金属パイ
プ３と取付金具１との間隙４にガラ６−
スシールを行う。
以上の如く本発明の二線式グ［ｌ−プラグは、前記発熱
チューブと取付金具とは、シーズチューブに該シーズチ
ューブ材とガラスシール材との中間の熱膨張係数を有す
る金属パイプを外嵌するとともに該金属パイプとともに
シーズチューブの金属パイプ嵌着部をスウ１−ジング加
工によりしぼり該しぼり加工した金属パイプ外周部と取
付金具の内周壁との環状間隙の先端がわ部をガラスシー
ルにより固着されているので、金属パイプと発熱チュー
ブとの気密がか確実に保持でき且つガラスシールとの接
合面との剥離が防止できる。
４、図面の簡単な説明
第１図は従来の二線式グロープラグの断面図、第２図は
従来の他の二線式グロープラグの断面図、第３図は本発
明の実施例を示す二線式グロープラグの断面図、第４図
（イ）〜（ニ）はその製造工程図である。
１・・・取付金具、２・・・発熱チューブ、３・・・金
属バ７−
イブ、４・・・ガラスシール
−８−Fig. 1 is a sectional view of a conventional two-wire glow plug, Fig. 2 is a sectional view of another conventional two-wire glow plug, and Fig. 3 is a sectional view of a two-wire glow plug showing an embodiment of the present invention. Figures 4(a) to 4(d) are manufacturing process diagrams. 1... Mounting bracket, 2... Heat generation ≠ tube, 3...
Metal pipe, 4...Glass seal 7- Figure 4 Iha Commissioner of the Patent Office 1. Display of the case 1982 Patent Application No. 214226@2, title of the invention Two-wire glow plug 3, person making the amendment Relationship to the case Patent applicant Address 14-18 Takatsuji-cho, Mizuho-ku, Nagoya Name
NGK Spark Plug Co., Ltd. (454) Representative Osamu Ogawa 4, Agent 465 Telephone 052-773-24496,
Full text of the specification subject to amendment. 7. Contents of the amendment As shown in the attached sheet. Description 1, Name of the invention, Two-wire glow plug 2, Claims 1) A rod-shaped center electrode is inserted into a metal sheathed duplex with a closed tip, and the center electrode is inserted between the tip of the center electrode and the bottom of the sheath tube. A heating tube, which is connected with a heating wire and is formed by filling the sheath tube with an insulating material and fixing the center electrode and the heating wire, is inserted coaxially into a hollow receptacle and is electrically connected. In a two-wire glow plug that is fixed in an insulated state, the heat generating tube and the mounting bracket include a metal pipe having a thermal expansion coefficient intermediate between that of the sheath tube material and the glass seal material, and a metal pipe having a thermal expansion coefficient intermediate between that of the sheath tube material and the glass seal material. Together with the metal pipe, the metal pipe fitting part of the sheath tube is squeezed by swaging process, and the tip of the annular gap between the swaging process outer circumferential part of the metal pipe and the inner circumferential wall of the mounting bracket is fixed with a glass seal. A two-wire glow plug featuring: 3. DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a two-wire glow plug for use in preheating an internal combustion engine. 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 G-Z-B Cope are connected with a heating wire, and the sheath tube is filled with an insulating material. There is a two-wire glow plug in which a heating tube with a fixed center electrode and a heating wire is coaxially inserted into a hollow fitting and fixed in an electrically insulated state. (For example, see Japanese Utility Model Publication No. 45-4089.) In the conventional product, as shown in FIG. In two-wire glow plugs insulated by such glass seals, the heating tube 2 is usually made of stainless steel (for example, 5US310S).
, Inconel 600, etc.) with a thermal expansion coefficient of 160 to 16.
5 (X 10') degrees Celsius or less), whereas the thermal expansion coefficient of glass is about 50 to 110, so the bonded surface will peel off over time due to the difference in thermal expansion due to repeated use at high and low temperatures. Seal failure is likely to occur. To prevent this seal failure, as shown in Fig. 2, a metal pipe 3 having a thermal expansion coefficient between the heat generating tube 2 and the glass seal 5 (for example, 5US403.5US410 with a thermal expansion coefficient of about 110) is installed between the heat generating tube 2 and the glass seal 5. This can be prevented by intervening the heating tube by crimping it, but with normal roll crimping, complete airtightness between the heating tube and the metal pipe cannot be achieved. An object of the present invention is to provide a two-wire glow plug that can reliably maintain airtightness between the metal pipe and the heating tube, and can also prevent separation from the joint surface with the glass seal. Next, the present invention will be explained based on FIG. 3-1 is a hollow mounting bracket having an engine mounting screw 12 formed on its outer periphery; 2 is a heat generating tube made of stainless steel I (SUS31) with a closed end 21Δ and an outer diameter somewhat smaller than the inner diameter of the mounting bracket; O3) made sheath tube 21
A metal center electrode 22 is inserted in the center of the
and the bottom wall 21B of the sheath tube 21, a heating wire 23 made of a spirally wound nichrome wire is welded and connected, and magnesia, alumina, or An electrically insulating ceramic powder 24 such as beryllia is filled under pressure.
Its ends are held and formed by glass seals 25. A pipe 3 made of 5US403 is fitted around the outer periphery of the sheathed pipe 21, and the outer diameter of the rear end of the sheathed tube 21, including the fitting neck of the pipe 3, is reduced by swaging to reduce the outer diameter of the metal pipe 3. is smaller in diameter than the inner diameter of the inner circumferential wall of the mounting bracket 1 by a predetermined dimension. By this swaging process, the outer periphery of the sheath tube 21 and the inner periphery of the metal pipe 3 are tightly adhered to each other over the entire width, making them completely airtight. The mounting bracket 1 and the heat generating tube 2 are fitted by inserting the heat generating tube 2 into the center of the bracket 1 and fitting it onto the inner circumferential wall of the mounting bracket 1 and the heat generating tube 2 while aligning the center. A glass sealing material 5 is filled into the tip end of the annular gap 4 between the outer circumferential walls of the metal pipe 3, and then heated to melt the glass sealing material 5.
It is made by gluing the outer circumferential wall and the inner circumferential wall of the bracket. If the annular gap 4 is narrow, a glass sealant shaped like Pace 1 may be applied to the outer circumferential wall of the heating tube or the inner circumferential wall of the mounting bracket, and then the two are fitted together. It may also depend on how you insert it. 6 is a ring-shaped terminal press-fitted or brazed at the rear end of the sheath tube; 7
is a resin insulating ring interposed between the terminal 6 and the rear end surface 14 of the mounting bracket 1. Figures 4(a), 4(a) and 4(d) show the manufacturing process of the two-wire glow plug of the present invention. As shown in FIG. 4(A), the metal pipe 30 is externally fitted onto the sheathed tube material 20 with one end (tip) squeezed, and either one of the ends A or B of the fitting surfaces of the two is fixed by welding. Alternatively, as shown in FIG. 4(B), roll tighten C1D from the outer periphery of the metal pipe 30 using a measuring method or the like.
0 and the sheath tube material 20 are temporarily integrated. Next, as shown in FIG. 4(c), the center electrode 22, the coiled heating wire 2
3. Assemble the center shaft assembly 10 with the rivets 2G connected by welding as shown in the figure, and attach the rivets 2G to the sheathed tube material 20.
into the tip hole 28 and weld them together. More seeds
Insulating ceramic powder 24 is filled into tube material 20 . Thereafter, the outer diameters of the sheathed tube material 20 and the metal pipe 30 are reduced by swaging as shown in FIG. 4(d), and then a glass seal 25 is applied to the opening of the sheathed tube 21. (The outside diameter of the pipe should be the same as the outside diameter of the tip of the sheath tube.) At this point, the seal between the metal pipe and the sheath tube is complete. Thereafter, as shown in FIG. 3, a glass seal is applied to the gap 4 between the metal pipe 3 and the fitting 1. As described above, in the two-wire plug [L-plug] of the present invention, the heat generating tube and the mounting bracket are formed by fitting a metal pipe having a coefficient of thermal expansion between the sheath tube material and the glass seal material onto the sheath tube. At the same time, the metal pipe fitting part of the sheath tube is squeezed together with the metal pipe by a suging process, and the tip of the annular gap between the squeezed metal pipe outer circumferential part and the inner circumferential wall of the mounting bracket is fixed with a glass seal. Therefore, the airtightness between the metal pipe and the heating tube can be maintained reliably, and separation from the joint surface with the glass seal can be prevented. 4. Brief description of the drawings Fig. 1 is a sectional view of a conventional two-wire glow plug, Fig. 2 is a sectional view of another conventional two-wire glow plug, and Fig. 3 shows an embodiment of the present invention. The cross-sectional view of the two-wire glow plug, and FIGS. 4(a) to 4(d) are diagrams of its manufacturing process. 1... Mounting bracket, 2... Heat generating tube, 3... Metal bar 7-eve, 4... Glass seal -8-
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
との間を発熱線で接続し、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
ロープラグにおいて、 前記発熱チューブと取付金具とは、シーズチューブに該
シーズチューブ材とガラスシール材との中間の熱膨張係
数を有する金属パイプを外嵌するとともに該金属パイプ
とともにシーズチューブの金属パイプ嵌看部をスウエー
ジング加工によりしぼり該しぼり加工した金属パイプ外
周部と取付金具の内周壁との環状間隙の先端がわ部をガ
ラスシールにより固着したことを特徴とする二線式グロ
ープラグ。[Scope of 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 center electrode is inserted into the sheath tube. A two-wire glow plug in which a heating tube filled with 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 above, the heating tube and the mounting bracket include a metal pipe having a thermal expansion coefficient intermediate between that of the sheath tube material and the glass sealing material, and a metal pipe fitting part of the sheath tube together with the metal pipe. A two-wire glow plug characterized in that the tip of the annular gap between the outer peripheral part of the swaged metal pipe and the inner peripheral wall of the mounting bracket is fixed with a glass seal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21422681A JPS58115224A (en) | 1981-12-28 | 1981-12-28 | Two-line glow plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21422681A JPS58115224A (en) | 1981-12-28 | 1981-12-28 | Two-line glow plug |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58115224A true JPS58115224A (en) | 1983-07-08 |
Family
ID=16652281
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21422681A Pending JPS58115224A (en) | 1981-12-28 | 1981-12-28 | Two-line glow plug |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58115224A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100915939B1 (en) | 2007-10-10 | 2009-09-11 | 주식회사 유라테크 | Glow plug |
| JP2015155790A (en) * | 2014-01-15 | 2015-08-27 | 日本特殊陶業株式会社 | Sheath heater and glow plug |
-
1981
- 1981-12-28 JP JP21422681A patent/JPS58115224A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100915939B1 (en) | 2007-10-10 | 2009-09-11 | 주식회사 유라테크 | Glow plug |
| JP2015155790A (en) * | 2014-01-15 | 2015-08-27 | 日本特殊陶業株式会社 | Sheath heater and glow plug |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5949023A (en) | Temperature-resistant cable bushing and method for the manufacture of the same | |
| US6168069B1 (en) | Method of brazing titanium to stainless steel | |
| US20100122975A1 (en) | Glow plug with metallic heater probe | |
| JP5327270B2 (en) | Ceramic heater | |
| JP5129599B2 (en) | Gas sensor and manufacturing method thereof | |
| JPS58115224A (en) | Two-line glow plug | |
| JPH01283788A (en) | Creeping gap type ignitor plug | |
| WO2002033149A1 (en) | Ceramic heater type glow plug and method of manufacturing the glow plug | |
| JP2001242128A (en) | Lead wire sealing structure, method of manufacturing the same and gas sensor using lead wire sealing structure | |
| US4749845A (en) | Electrically conductive silicone carbide heating unit | |
| JP2020034506A (en) | Gas sensor | |
| US5838094A (en) | Seals and igniters | |
| JPH10300713A (en) | Method and device for manufacturing electrochemical sensor | |
| JPS6210616Y2 (en) | ||
| JPS6115414Y2 (en) | ||
| WO2003044438A1 (en) | Defrosting heater, and manufacturing method thereof | |
| JP2000055851A (en) | Measurement sensor and method for forming cable connection part in it | |
| EP0113542A1 (en) | A thermocouple | |
| JPS58117923A (en) | Two-wire glow plug and its manufacture | |
| JP2835209B2 (en) | Ceramic heater | |
| JPS58138923A (en) | Two-wired type glow plug | |
| US2103759A (en) | Spark plug and method of making the same | |
| JP2537221Y2 (en) | Pressure sensor | |
| JPS6215651Y2 (en) | ||
| JPS58138922A (en) | Process for securing and sealing fixture of two-wire type glow plug with heating tube |