JPS63311022A - Ceramic glow plug - Google Patents
Ceramic glow plugInfo
- Publication number
- JPS63311022A JPS63311022A JP14365087A JP14365087A JPS63311022A JP S63311022 A JPS63311022 A JP S63311022A JP 14365087 A JP14365087 A JP 14365087A JP 14365087 A JP14365087 A JP 14365087A JP S63311022 A JPS63311022 A JP S63311022A
- Authority
- JP
- Japan
- Prior art keywords
- unit
- center shaft
- inner cavity
- metal
- 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.)
- Granted
Links
- 239000000919 ceramic Substances 0.000 title claims abstract description 32
- 229910052751 metal Inorganic materials 0.000 claims abstract description 24
- 239000002184 metal Substances 0.000 claims abstract description 24
- 239000012212 insulator Substances 0.000 claims description 6
- 238000002788 crimping Methods 0.000 claims description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 4
- 239000011521 glass Substances 0.000 abstract description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 2
- 239000004568 cement Substances 0.000 abstract description 2
- 239000000395 magnesium oxide Substances 0.000 abstract description 2
- 238000000034 method Methods 0.000 abstract description 2
- 238000012856 packing Methods 0.000 abstract description 2
- 239000000843 powder Substances 0.000 abstract description 2
- 239000003566 sealing material Substances 0.000 abstract description 2
- 239000000377 silicon dioxide Substances 0.000 abstract description 2
- 229920003051 synthetic elastomer Polymers 0.000 abstract description 2
- 239000005061 synthetic rubber Substances 0.000 abstract description 2
- 239000012777 electrically insulating material Substances 0.000 abstract 1
- -1 etc. Inorganic materials 0.000 abstract 1
- 239000011810 insulating material Substances 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 description 8
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000005476 soldering Methods 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 229910001080 W alloy Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 239000000615 nonconductor Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
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エンジンに使用されるグロープラグ
で、特に直噴式ディーゼルエンジンの使用に好適なセラ
ミックヒータを内蔵し友セラミックグロープラグに関す
る。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a glow plug used in a diesel engine, and particularly to a ceramic glow plug with a built-in ceramic heater suitable for use in a direct injection diesel engine.
一般にディーゼルエンジンは低温時に始動性が悪いため
、燃焼室内にグロープラグを設けてこれに電流を流して
加熱することによシ始動性を向上させている。近年、速
熱性、高温耐久性の両面から発熱体にセラミックヒータ
を装着したセラミックグロープラグが用いられている。Diesel engines generally have poor startability at low temperatures, so a glow plug is provided in the combustion chamber and current is passed through it to heat it to improve startability. In recent years, ceramic glow plugs in which a ceramic heater is attached to a heating element have been used from the standpoint of both rapid heating and high-temperature durability.
その代表例として第３図に示すように、セラミックヒー
タ１は例えばタングステン合金等の高融点金属をらせん
状に巻設したＵ字状の発熱コイ／Ｌ／２を窒化珪素等の
セラミック焼結体内に埋設したものからなり、このセラ
ミックヒータｌは金属外筒３の内腔に発熱コイル２の一
端とともにろう接によって固着され、発熱コイル２の他
端はセラミックヒータ１の後端部に冠着されたリードコ
イル４の先端とろう接されている。リードコイル４の他
端は中軸６の先端部に接続され、金属外筒３は取付金具
１０の先端内腔にろう接によって固着され、中軸６け取
付合具１０の後端部内腔にスリーブ１５で包囲された絶
縁体１６を嵌合し、スリーブ１５の端面を取付金具１０
の後端周縁１０ｄを加締めて固着するか、又は中軸６を
直接ガラスシールによ）で固着する方法が採用さｎてお
り、中軸とセラミックヒータの間の導通確保と中軸固着
力の確保がなされている。As a typical example, as shown in FIG. 3, the ceramic heater 1 includes a U-shaped heating coil/L/2 made of a high-melting point metal such as a tungsten alloy wound in a spiral shape inside a ceramic sintered body such as silicon nitride. The ceramic heater l is fixed to the inner cavity of the metal outer cylinder 3 together with one end of the heating coil 2 by soldering, and the other end of the heating coil 2 is attached to the rear end of the ceramic heater 1. It is soldered to the tip of the lead coil 4. The other end of the lead coil 4 is connected to the distal end of the center shaft 6, the metal outer cylinder 3 is fixed to the inner cavity of the distal end of the mounting fitting 10 by soldering, and the sleeve 15 is connected to the inner cavity of the rear end of the six-piece inner shaft mounting fitting 10. Fit the insulator 16 surrounded by
A method is adopted in which the rear end periphery 10d is crimped and fixed, or the center shaft 6 is directly fixed with a glass seal. being done.
ところで、渦流室等の副室式の燃焼室をもつディーゼル
エンジン用グロープラグは取付金具ねじ下部１０ａから
エンジン側の気密を封着するテーパーシート面１０ｂま
での距離（ｌりが比較的短いため、上記従来の構造では
特に問題を生じないが、生学焼室に直接噴射する直噴式
ディーゼルエンジンにおいては、冷却水、吸排気パルプ
等のレイアウトの都合上、グロープラグの取付ねじ下部
が燃焼室から離れた場所にあるた−Ｏ，取付金具の取付
ねじ下部寸法＜ｅ）が長くなる。このため従来の構造で
はリードコイＩｖ４’ｉ長くするか、又は中軸６の長さ
を長くせざる（ｉｌ−得ない。しかし前者のリードコイ
／Ｌ／ｉ長くすると、抵抗値が増加して自己発熱による
酸化、機関の振動によｐ断線するおそれがあった。又後
者の中軸を長くすると、中軸固着部と中軸先端までの距
離が長くなり過ぎて振動等により中軸の固着力が低下し
、リードコイルが断線するおそれがあった。By the way, glow plugs for diesel engines that have an auxiliary combustion chamber such as a swirl chamber have a relatively short distance from the screw lower part 10a of the mounting bracket to the tapered seat surface 10b that seals airtightly on the engine side. There is no particular problem with the above conventional structure, but in direct injection diesel engines that inject directly into the combustion chamber, due to the layout of cooling water, intake and exhaust pulp, etc., the lower part of the glow plug mounting screw is separated from the combustion chamber. Since it is located far away, the lower dimension of the mounting screw of the mounting bracket (e) becomes longer. For this reason, in the conventional structure, either the lead coil Iv4'i has to be made longer, or the length of the center shaft 6 has to be made longer. There was a risk of disconnection due to oxidation and engine vibration.Also, if the latter center shaft was lengthened, the distance between the center shaft fixing part and the tip of the center shaft would become too long, and the fixing force of the center shaft would decrease due to vibration, etc., and the lead coil There was a risk of wire breakage.
本発明は上記点に鑑みてなされたものであ′つてグロー
プラグの取付金具の取付ねじ下部とテーパーシート面ま
での距離が長い場合でも取付金具内部の中軸とセラミッ
クヒータとの間の導通を確保し、中軸の固着力の低下を
防止して耐久性の優れたセラミックグロープラグを提供
しようとするものである。The present invention has been made in view of the above points, and ensures continuity between the center shaft inside the glow plug mounting bracket and the ceramic heater even when the distance between the lower part of the mounting screw of the glow plug mounting bracket and the tapered seat surface is long. However, the present invention aims to provide a ceramic glow plug with excellent durability by preventing a decrease in the fixing force of the center shaft.
本発明は取付金具の内腔内にその先端より露出するセラ
ミックヒータを配設踵前記セラミックヒータの後端でリ
ードコイ／Ｉ／ヲ介して取付金具後端に導出する中軸と
接続されると共に、前記中軸が前記取付金具後端で絶縁
封着されてなるセラミックグロープラグにおいて、前記
中軸はその両端部を裸出して金属チューブ内に絶縁物を
介して保持された中軸組立体からな９、この中軸組立体
全前記取付金具内腔内に挿設すると共に前記取付金具の
胴部外周を内方に加締めて前記金属チューブを固着した
ものである。The present invention provides a ceramic heater that is exposed from its tip inside the inner cavity of the mounting bracket, and the rear end of the ceramic heater is connected to the center shaft leading out to the rear end of the mounting bracket via a lead coil/I/. In a ceramic glow plug in which a center shaft is insulated and sealed at the rear end of the mounting bracket, the center shaft is a center shaft assembly held in a metal tube via an insulator with both ends exposed. The entire assembly is inserted into the inner cavity of the mounting bracket, and the outer periphery of the body of the mounting bracket is crimped inward to secure the metal tube.
本発明は上記構成のように、中軸を金属チューブと中軸
の間に絶縁物を介した中軸組立体を使用し、且つ取付金
具の胴部外周を加締めることによって金属チューブを固
着して中軸組立体を固定したことにより、長い中軸を使
用しても耐振性を具えるためリードコイルは短くでき、
中軸の固着力は安定することができる。The present invention, as configured above, uses a center shaft assembly with an insulator interposed between the metal tube and the center shaft, and also fixes the metal tube by tightening the outer periphery of the body of the mounting bracket to assemble the center shaft. By fixing the three-dimensional structure, the lead coil can be shortened to provide vibration resistance even when using a long center shaft.
The fixing force of the central shaft can be stabilized.
以下、本発明を第１図、舊２図の実施例に基づいて説明
する。The present invention will be explained below based on the embodiments shown in FIGS. 1 and 2.
第１図（は本発明のセフミックグロープラグの実施例の
一半を断面で示した正面図であり、第２図は中軸組立体
の断面図である。■はセラミックヒータであり、従来と
同様に５ｉｓＮ４焼結体の内部にタングステン、モリブ
デン又はこれらを主体とする合金からなる発熱コイルが
埋設されておりこのセラミックヒータの後部に前記発熱
コイルの一端が露出して金属外筒３に導通してろう接さ
れている。４？″ｉ！７−ドコイルでその一端は前記セ
ラミックヒータ１の後端に発熱コイルの他端が露出して
キャップ５を介してろう接されている。リードコイｐ４
の他端は中軸組立体９の内部の中軸６の先端６ａと接続
されている。そして中軸組立体９は第２図に示すように
、中軸６の先端６ａ及び雄ねじを形成した後端部６ｂが
裸出させて金属パイプ７内に挿入され、前記中軸６と前
記金属パイプ７の間にマグネシャ、アルミナ等のセラミ
ック粉末又はシリカセメントなどの電気的絶縁物８が充
填され、又充填密度を向上するために径方向から絞り加
工が必要に応じて施されている。Fig. 1 is a front view in cross section of one half of the embodiment of the cefmic glow plug of the present invention, and Fig. 2 is a sectional view of the center shaft assembly. A heating coil made of tungsten, molybdenum, or an alloy mainly composed of these is embedded inside the 5isN4 sintered body, and one end of the heating coil is exposed at the rear of the ceramic heater and is electrically connected to the metal outer cylinder 3. The other end of the heating coil is exposed to the rear end of the ceramic heater 1 and is soldered to the rear end of the ceramic heater 1 through the cap 5. A lead coil p4 is soldered to the ceramic heater 1.
The other end is connected to the tip 6a of the center shaft 6 inside the center shaft assembly 9. Then, as shown in FIG. 2, the center shaft assembly 9 is inserted into a metal pipe 7 with the tip 6a of the center shaft 6 and the male-threaded rear end 6b exposed, and the center shaft 6 and the metal pipe 7 are connected to each other. An electrical insulator 8 such as ceramic powder such as magnesia or alumina or silica cement is filled in between, and drawing is performed in the radial direction as necessary to improve the packing density.
さてセラミックヒータ１に金属外筒３とリードコイ／Ｉ
／４がろう接され、且つリードコイ／Ｌ／４と中軸組立
体９の中軸先端６ａが接続された後、取付金具１０の内
腔内１０ｃの所定位置になるように挿入されて金属外筒
３と取付金具の内腔先端部がろう接される。その後前記
中軸組立体９の金属チューブ７が挿入された上下２箇所
を取付金具１０の胴部外周から六角形状等の加締め１１
を施すことで内腔内に中軸組立体１０が強固に固定され
る。Now, ceramic heater 1, metal outer cylinder 3 and lead coil/I
/4 is soldered, and after the lead coil /L/4 and the center shaft tip 6a of the center shaft assembly 9 are connected, the metal outer cylinder 3 is inserted into the inner cavity 10c of the mounting bracket 10 at a predetermined position. and the lumen tip of the fitting are brazed. After that, the upper and lower two places where the metal tube 7 of the central shaft assembly 9 is inserted are crimped 11 in a hexagonal shape or the like from the outer periphery of the body of the mounting bracket 10.
By performing this, the center shaft assembly 10 is firmly fixed within the inner cavity.
１２は中軸６と取付金具の内腔後端との間に絶縁してシ
ールするガラスシール材又ハ合成ゴムパツキン等の絶縁
体である。１３は絶縁板、１４は絶縁板を締結するすｙ
トである。なお本発明のセラミックグロープラグは金属
外筒を省略してセラミックヒータを取付金具に直接接合
したものであってもよい。Reference numeral 12 denotes an insulator such as a glass sealing material or a synthetic rubber gasket for insulating and sealing between the center shaft 6 and the rear end of the inner cavity of the mounting fitting. 13 is an insulating plate, and 14 is a suy for fastening the insulating plate.
It is. Note that the ceramic glow plug of the present invention may be one in which the metal outer cylinder is omitted and the ceramic heater is directly joined to the mounting fitting.
以上の構成からなる本発明のセラミックグロープラグは
長い中軸を使用しても中軸径が２．Ｏｆｆ以上と太くす
ることができるため抵抗値の増加が殆どなく、又中軸組
立体を取付金具の胴部外周から加締めて固着することが
ら耐振性を有して固着力の低下がなく優れた耐久性を有
することができる。The ceramic glow plug of the present invention having the above configuration has a center shaft diameter of 2.5 mm even if a long center shaft is used. Since it can be made thicker than Off, there is almost no increase in resistance value, and since the center shaft assembly is fixed by crimping from the outer periphery of the body of the mounting bracket, it has excellent vibration resistance and no decrease in fixing force. It can be durable.
特に本発明は取付ねじ下部からテーパーシート面までの
距離が長い取付金具を用いる直噴式ディーゼルエンジン
のセラミックグロープラグの使用に有効である。Particularly, the present invention is effective for use with a ceramic glow plug for a direct injection diesel engine that uses a mounting bracket that has a long distance from the bottom of the mounting screw to the tapered seat surface.
第１図は本発明のセラミックグロープラグの実施例の一
半を断面で示した正面図、＠２図は中軸組立体の断面図
、第３図は従来のセラミックグロープラグを示した断面
図である。
１・−セラミックヒータ ４・・・リードコイ／Ｌ／６
・・・中軸 ７・・・金属パイプ ８・・・絶縁物 ９
・・・中軸組立体 １０・・・取付金具 １０ｃ・・・
内腔 １１・−・加締めFig. 1 is a front view in cross section of one half of the embodiment of the ceramic glow plug of the present invention, Fig. 2 is a sectional view of the center shaft assembly, and Fig. 3 is a sectional view of a conventional ceramic glow plug. . 1.-Ceramic heater 4.Lead coil/L/6
...Center shaft 7...Metal pipe 8...Insulator 9
...Center shaft assembly 10...Mounting bracket 10c...
Inner cavity 11.--Clinching
Claims (1)
ックヒータを配設し、前記セラミックヒータの後端でリ
ードコイルを介して取付金具後端に導出する中軸と接続
されると共に、前記中軸が前記取付金具後端で絶縁封着
されてなるセラミックグロープラグにおいて、前記中軸
はその両端部を裸出して金属チューブ内に絶縁物を介し
て保持された中軸組立体からなり、この中軸組立体を前
記取付金具内腔内に挿設すると共に前記取付金具の胴部
外周を内方に加締めて前記金属チューブを固着したこと
を特徴とするセラミックグロープラグ。(1) A ceramic heater exposed from its tip is disposed in the inner cavity of the mounting bracket, and the rear end of the ceramic heater is connected to the center shaft led out to the rear end of the mounting bracket via a lead coil, and the center shaft is insulated and sealed at the rear end of the mounting bracket, and the center shaft consists of a center shaft assembly held in a metal tube via an insulator with both ends exposed, and the center shaft assembly A ceramic glow plug characterized in that the metal tube is fixed by inserting the metal tube into the inner cavity of the fitting and crimping the outer periphery of the body of the fitting inward.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14365087A JPS63311022A (en) | 1987-06-09 | 1987-06-09 | Ceramic glow plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14365087A JPS63311022A (en) | 1987-06-09 | 1987-06-09 | Ceramic glow plug |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63311022A true JPS63311022A (en) | 1988-12-19 |
| JPH0445730B2 JPH0445730B2 (en) | 1992-07-27 |
Family
ID=15343720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14365087A Granted JPS63311022A (en) | 1987-06-09 | 1987-06-09 | Ceramic glow plug |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63311022A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002033149A1 (en) * | 2000-10-17 | 2002-04-25 | Bosch Automotive Systems Corporation | Ceramic heater type glow plug and method of manufacturing the glow plug |
| JP2002213745A (en) * | 2001-01-18 | 2002-07-31 | Chiaki Nakamura | Glow plug for four-cycle model engine |
| US6744015B2 (en) | 2001-05-31 | 2004-06-01 | Ngk Spark Plug Co., Ltd. | Heater and method for manufacturing the same |
-
1987
- 1987-06-09 JP JP14365087A patent/JPS63311022A/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002033149A1 (en) * | 2000-10-17 | 2002-04-25 | Bosch Automotive Systems Corporation | Ceramic heater type glow plug and method of manufacturing the glow plug |
| JP2002213745A (en) * | 2001-01-18 | 2002-07-31 | Chiaki Nakamura | Glow plug for four-cycle model engine |
| US6744015B2 (en) | 2001-05-31 | 2004-06-01 | Ngk Spark Plug Co., Ltd. | Heater and method for manufacturing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0445730B2 (en) | 1992-07-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| EXPY | Cancellation because of completion of term |