JPH0445730B2 - - Google Patents
Info
- Publication number
- JPH0445730B2 JPH0445730B2 JP14365087A JP14365087A JPH0445730B2 JP H0445730 B2 JPH0445730 B2 JP H0445730B2 JP 14365087 A JP14365087 A JP 14365087A JP 14365087 A JP14365087 A JP 14365087A JP H0445730 B2 JPH0445730 B2 JP H0445730B2
- Authority
- JP
- Japan
- Prior art keywords
- center shaft
- mounting bracket
- rear end
- ceramic heater
- ceramic
- 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.)
- Expired
Links
- 239000000919 ceramic Substances 0.000 claims description 32
- 229910052751 metal Inorganic materials 0.000 claims description 17
- 239000002184 metal Substances 0.000 claims description 17
- 239000012212 insulator Substances 0.000 claims description 6
- 238000002788 crimping Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 description 10
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 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
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000034 method 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
- 238000012856 packing Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 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
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はデイーゼルエンジンに使用されるグロ
ープラグで、特に直噴式デイーゼルエンジンの使
用に好適なセラミツクヒータを内蔵したセラミツ
クグロープラグに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a glow plug used in a diesel engine, and particularly to a ceramic glow plug incorporating a ceramic heater suitable for use in a direct injection diesel engine.
一般にデイ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り始動性を向上
させている。近年、速熱性、高温耐久性の両面か
ら発熱体にセラミツクヒータを装着したセラミツ
クグロープラグが用いられている。その代表例と
して第３図に示すように、セラミツクヒータ１は
例えばタングステン合金等の高融点金属をらせん
状に巻線したＵ字状の発熱コイル２を窒化珪素等
のセラミツクス焼結体内に埋設したものからな
り、このセラミツクヒータ１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つて固
着され、発熱コイル２の他端はセラミツクヒータ
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１
０の先端内腔にろう接によつて固着され、中軸６
は取付金具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つ
て固着する方法が採用されており、中軸とセラミ
ツ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。
Diesel engines generally have poor startability at low temperatures, so starting is improved by installing a glow plug in the combustion chamber and heating it by passing an electric current through it. In recent years, ceramic glow plugs in which a ceramic heater is attached to the heating element have been used from the standpoint of both rapid heating properties and high-temperature durability. As a typical example, as shown in FIG. 3, a ceramic heater 1 has a U-shaped heating coil 2 spirally wound with a high melting point metal such as a tungsten alloy and embedded in a ceramic sintered body such as silicon nitride. This ceramic heater 1 is fixed to the inner cavity of a metal outer cylinder 3 together with one end of a 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 tip of the center shaft 6, and the metal outer cylinder 3 is connected to the mounting bracket 1.
It is fixed to the tip lumen of 0 by soldering, and the middle shaft 6
The insulator 16 surrounded by the sleeve 15 is fitted into the inner cavity of the rear end of the mounting bracket 10, and the end surface of the sleeve 15 is fixed by crimping the rear end peripheral edge 10d of the mounting bracket 10, or the inner shaft 6 is directly connected to the inner shaft 6. A method of fixing with a glass seal is used to ensure continuity between the center shaft and the ceramic heater and to secure the center shaft fixing force.
ところで、渦流室等の副室式の燃焼室をもつデ
イ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、
主燃焼室に直接噴射する直噴式デイーゼルエンジ
ンにおいては、冷却水、吸排気バルブ等のレイア
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め、取付金具の取付
ねじ下部寸法ｌが長くなる。このため従来の構造
ではリードコイル４を長くするか、又は中軸６の
長さを長くせざるを得ない。しかし前者のリード
コイルを長くすると、抵抗値が増加して自己発熱
による酸化、機関の振動により断線するおそれが
あつた。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
するおそれがあつた。 By the way, a glow plug for a diesel engine having an auxiliary combustion chamber such as a swirl chamber has a relatively short distance l from the lower part 10a of the mounting bracket screw to the tapered seat surface 10b that seals airtightly on the engine side. There is no particular problem with the structure of
In direct-injection diesel engines that inject water directly into the main combustion chamber, the lower part of the glow plug's mounting screw is located away from the combustion chamber due to the layout of cooling water, intake and exhaust valves, etc.; The dimension l becomes longer. For this reason, in the conventional structure, either the lead coil 4 has to be made longer or the length of the center shaft 6 has to be made longer. However, when the former lead coil was made longer, the resistance value increased and there was a risk of wire breakage due to oxidation due to self-heating and engine vibration. Furthermore, if the latter center shaft is lengthened, the distance between the center shaft fixing portion and the tip of the center shaft becomes too long, and the fixing force of the center shaft decreases due to vibrations, etc., and there is a risk that the lead coil may break.
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
部の中軸とセラミツ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
たセラミツ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 even if the distance between the lower part of the mounting screw of the glow plug mounting bracket and the tapered seat surface is long, the present invention ensures continuity between the center shaft inside the mounting bracket and the ceramic heater. The object of the present invention is 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
するセラミツクヒータを配設し、前記セラミツク
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
ツ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ユ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ユーブ
を固着したものである。
In the present invention, a ceramic heater is disposed in the inner cavity of a mounting bracket and is exposed from its tip, and the rear end of the ceramic heater is connected to a central shaft led out to the rear end of the mounting bracket via a lead coil, and 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 is inserted into the inner cavity of the fitting, and the outer periphery of the body of the fitting is crimped inward to secure the metal tube.
本発明は上記構成のように、中軸を金属チユー
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
つて金属チユ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。
As configured above, the present invention uses a center shaft assembly with an insulator interposed between the metal tube and the center shaft, and fixes the metal tube by tightening the outer periphery of the body of the mounting bracket. By fixing the center shaft assembly, even if a long center shaft is used, the lead coil can be shortened to provide vibration resistance, and the fixing force of the center shaft can be stabilized.
以下、本発明を第１図、第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図は本発明のセラミツ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。１はセラミツクヒ
ータであり、従来と同様にSi3N4焼結体の内部に
タングステン、モリブテ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
セラミツ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はリードコイルでその一端は前記セラミツ
クヒータ１の後端に発熱コイルの他端が露出して
キヤツプ５をろう接されている。リードコイル４
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
マグネシヤ、アルミナ等のセラミツク粉末はシリ
カセメントなどの電気的絶縁物８が充填密度を向
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 sectional front view of one half of an embodiment of the ceramic glow plug of the present invention, and FIG. 2 is a sectional view of the center shaft assembly. 1 is a ceramic heater, in which a heating coil made of tungsten, molybdenum, or an alloy mainly composed of these is buried inside a Si 3 N 4 sintered body, as in the conventional case, and the heating coil is located at the rear of the ceramic heater. One end is exposed and electrically connected to the metal outer cylinder 3 and brazed. Reference numeral 4 denotes a lead coil, one end of which is exposed at the rear end of the ceramic heater 1, and the other end of the heating coil 4 is soldered to a cap 5. lead coil 4
The other end is the tip 6a of the center shaft 6 inside the center shaft assembly 9.
is connected to. 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. In between, ceramic powder such as magnesia or alumina is drawn with an electrical insulator 8 such as silica cement from the radial direction as necessary to improve the packing density.
さてセラミツクヒータ１に金属外周３とリード
コイル４がろう接され、且つリードコイル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
ユーブ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。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は合成ゴム
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ナツトである。なお本発明の
セラミツクグロープラグは金属外筒を省略してセ
ラミツクヒータを取付金具に直接接合したもので
あつてもよい。 Now, after the metal outer periphery 3 and the lead coil 4 have been soldered to the ceramic heater 1, and the lead coil 4 and the center shaft tip 6a of the center shaft assembly 9 have been connected, the ceramic heater 1 is placed at a predetermined position in the inner cavity 10c of the mounting bracket 10. The metal outer cylinder 3 and the inner end of the fitting are brazed together. After that, the mounting bracket 10 is attached to the upper and lower two places where the metal tube 7 of the center shaft assembly 9 is inserted.
The center shaft assembly 10 is firmly fixed in the inner cavity by applying a hexagonal crimping 11 from the outer periphery of the body. Reference numeral 12 denotes an insulator such as a glass sealing material or a synthetic rubber gasket that insulates and seals between the center shaft 6 and the rear end of the inner cavity of the mounting fitting. 13 is an insulating plate, 14
is a nut that fastens the insulating plate. 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ツクグロー
プラグは長い中軸を使用しても中軸径が2.0mm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か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。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
イーゼルエンジンのセラミツクグロープラグの使
用に有効である。
The ceramic glow plug of the present invention having the above configuration can have a diameter of 2.0 mm or more even if a long center shaft is used, so there is almost no increase in resistance value, and the center shaft assembly can be attached to the body of the mounting bracket. Since it is crimped and fixed from the outer periphery, it has vibration resistance, and has excellent durability without decreasing the fixing force. 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ツクグロープラグの実
施例の一半を断面で示した正面図、第２図は中軸
組立体の断面図、第３図は従来のセラミツクグロ
ープラグを示した断面図である。
１…セラミツクヒータ、４…リードコイル、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 showing a half section of an 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 showing a conventional ceramic glow plug. . 1... Ceramic heater, 4... Lead coil, 6
...Central shaft, 7.Metal pipe, 8.Insulator, 9.Central shaft assembly, 10.Mounting bracket, 10c.Inner cavity, 11..
Caulk.
Claims (1)
ラミツクヒータを配設し、前記セラミツクヒータ
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ツクグ
ロープラグにおいて、前記中軸はその両端部を裸
出して金属チユ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ユーブを固着
したことを特徴とするセラミツクグロープラグ。1 A ceramic heater exposed from its tip is disposed within the inner cavity of the mounting bracket, and the rear end of the ceramic heater is connected to a center shaft led out to the rear end of the mounting bracket via a lead coil, and the center shaft is connected to the rear end of the ceramic heater. In a ceramic glow plug that is insulated and sealed at the rear end of the mounting bracket, the center shaft is comprised of a center shaft assembly held in a metal tube via an insulator with both ends exposed, and this center shaft assembly is A ceramic glow plug characterized in that the metal tube is fixed by being inserted into a lumen of a mounting bracket and crimping the outer periphery of the body of the mounting bracket 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 JPS63311022A (en) | 1988-12-19 |
| JPH0445730B2 true 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) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3589206B2 (en) * | 2000-10-17 | 2004-11-17 | 株式会社ボッシュオートモーティブシステム | Ceramic heater type glow plug and method of manufacturing the same. |
| JP2002213745A (en) * | 2001-01-18 | 2002-07-31 | Chiaki Nakamura | Glow plug for four-cycle model engine |
| JP2002359060A (en) | 2001-05-31 | 2002-12-13 | Ngk Spark Plug Co Ltd | Heater and method of manufacturing heater |
-
1987
- 1987-06-09 JP JP14365087A patent/JPS63311022A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63311022A (en) | 1988-12-19 |
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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 |