JPH06241451A - Structure of glow plug - Google Patents

Structure of glow plug

Info

Publication number
JPH06241451A
JPH06241451A JP4584593A JP4584593A JPH06241451A JP H06241451 A JPH06241451 A JP H06241451A JP 4584593 A JP4584593 A JP 4584593A JP 4584593 A JP4584593 A JP 4584593A JP H06241451 A JPH06241451 A JP H06241451A
Authority
JP
Japan
Prior art keywords
tungsten
coil
platinum
glow plug
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.)
Withdrawn
Application number
JP4584593A
Other languages
Japanese (ja)
Inventor
Noriyasu Inanaga
紀康 稲永
Hirokazu Akagawa
裕和 赤川
Keizo Goto
敬造 後藤
Katsukage Uehara
勝景 上原
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Ltd
Choryo Engineering Co Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
Choryo Engineering Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Industries Ltd, Choryo Engineering Co Ltd filed Critical Mitsubishi Heavy Industries Ltd
Priority to JP4584593A priority Critical patent/JPH06241451A/en
Publication of JPH06241451A publication Critical patent/JPH06241451A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00Engines characterised by air compression and subsequent fuel addition
    • F02B3/06Engines characterised by air compression and subsequent fuel addition with compression ignition

Abstract

PURPOSE:To improve a life, reliability by forming a tungsten coil formed by depositing platinum on a surface of tungsten in a plug for a diesel engine in which low cetane number fuel is used as main fuel. CONSTITUTION:Tungsten is used as a heat generating coil material to form a tungsten coil 3A, and its surface is adhered with platinum by depositing, etc. Since a melting temperature of the platinum is sufficiently higher than a burning temperature and stable, it effectively performs a function as a reaction protective film of the tungsten. This coil 3A is buried in ceramics (b) of a glow plug, burned in a furnace to form the plug. Thus, its durability can be improved.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は低セタン価燃料を主燃料
とするディーゼルエンジンの強制着火装置に使用するグ
ロープラグの構造に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a glow plug used in a forced ignition device of a diesel engine which uses a low cetane number fuel as a main fuel.

【0002】[0002]

【従来の技術】図2は従来形のセラミックのグロープラ
グのヒータ部分の構造を示す。図示しないバッテリから
の電線と連通する電気導線1はセラミックb部分の上部
に挿入されている電線接続端子2に銀ロー付けaがされ
ている。セラミックbにはタングステンで出来た発熱コ
イル3が埋設されており、セラミックb下部ほど密に埋
設されている。この密なところh部がヒータ部である。
発熱コイル3はセラミックbの中間位置cで補助金具d
に銀ロー付され、グロープラグ本体下部eに通じてい
る。
2. Description of the Prior Art FIG. 2 shows the structure of a heater portion of a conventional ceramic glow plug. An electric conductor 1 communicating with an electric wire from a battery (not shown) has an electric wire connecting terminal 2 inserted in an upper portion of a ceramic b portion and provided with silver brazing a. The heating coil 3 made of tungsten is embedded in the ceramic b, and the lower part of the ceramic b is embedded more densely. This dense portion h is the heater portion.
The heating coil 3 is an auxiliary metal fitting d at an intermediate position c of the ceramic b.
It is attached to the lower part e of the glow plug body by silver brazing.

【0003】[0003]

【発明が解決しようとする課題】セラミックにタングス
テンコイルを埋設して固めるにはカーボンで出来た炉を
使用する。即ちセラミック内にタングステンコイルを収
めて成形したものを、前記炉に収納して高温高圧で焼き
固めたものであり所謂焼成したものである。この時、炉
材を形成するカーボン粒子がセラミック内に侵入すると
これがタングステンと反応してタングステンコイルの外
周にタングステンカーバイトの層を形成する。タングス
テンWとタングステンカーバイトWCは熱膨張に差があ
るため、このようになると、コイルが加熱、冷却を繰返
しているうちにコイル表面に熱膨張差に伴なうクラック
が発生する。このクラックの発生でコイルの抵抗が著し
く変化し、遂にはグロープラグの温度制御が使用不能に
陥りいわゆる破損となる。
A furnace made of carbon is used to embed and harden the tungsten coil in the ceramic. That is, it is a so-called fired product that is obtained by placing a tungsten coil in a ceramic and molding it, then placing it in the furnace and baking it at a high temperature and high pressure. At this time, when carbon particles forming the furnace material enter the ceramic, they react with tungsten to form a tungsten carbide layer on the outer periphery of the tungsten coil. Since there is a difference in thermal expansion between the tungsten W and the tungsten carbide WC, in this case, cracks due to the difference in thermal expansion occur on the coil surface while the coil is repeatedly heated and cooled. The generation of this crack significantly changes the resistance of the coil, and eventually the temperature control of the glow plug becomes unusable, resulting in so-called damage.

【0004】本発明の目的は前記従来装置の問題点を解
消し、グロープラグ自体の寿命を大幅に進展させ低セタ
ン価燃料を使用するエンジンの信頼性を高めるグロープ
ラグの構造を提供するにある。
An object of the present invention is to solve the above problems of the conventional device, and to provide a structure of a glow plug which greatly extends the life of the glow plug itself and enhances the reliability of an engine using a low cetane number fuel. .

【0005】[0005]

【課題を解決するための手段】本発明のグロープラグの
構造は、焼成前のタングステンコイルの表面に保護膜と
して白金(Pt)を蒸着等により付着させ、該タングス
テンコイルを加熱コイルとしてセラミック内に埋設して
成形し焼成したことを特徴としている。
According to the structure of the glow plug of the present invention, platinum (Pt) is deposited as a protective film on the surface of a tungsten coil before firing by vapor deposition or the like, and the tungsten coil is used as a heating coil in a ceramic. It is characterized by being buried, molded and fired.

【0006】[0006]

【作用】白金を蒸着したタングステンコイル3Aを発熱
コイルとしてセラミック材料と共に成形し1400℃近
傍まで加熱し且つ加圧して焼成しているが、白金がタン
グステンの保護膜として作用するためタングステンカー
バイトの形成を防止できるため、グロープラグの寿命を
大幅に進展させることができる。
The tungsten coil 3A having platinum vapor deposited thereon is molded as a heating coil together with a ceramic material and heated up to around 1400 ° C. and pressed and fired. However, since platinum acts as a protective film for tungsten, tungsten carbide is formed. Since this can be prevented, the life of the glow plug can be greatly extended.

【0007】[0007]

【実施例】以下図1を参照して本考案の実施例について
説明する。なお図2と同符号のものは構造と作用は共に
従来例と同一であるので説明を省略する。本願において
は従来のタングステンコイル3にかえて表面に白金を蒸
着等で付着させたタングステンコイル3Aを使用したも
のである。白金の溶融温度は焼成温度より十分高く、且
つ安定しているため、タングステンの反応保護膜として
有効に作用し、グロープラグの耐久性が大幅に延長す
る。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. The same reference numerals as those in FIG. 2 have the same structure and operation as those of the conventional example, and therefore the description thereof will be omitted. In the present application, the conventional tungsten coil 3 is replaced with a tungsten coil 3A having platinum adhered to the surface by vapor deposition or the like. Since the melting temperature of platinum is sufficiently higher than the firing temperature and is stable, it effectively acts as a reaction protection film for tungsten, and the durability of the glow plug is greatly extended.

【0008】[0008]

【発明の効果】本発明のグロープラグの構造は、タング
ステンコイル表面に白金を蒸着等で付着させる事により
タングステン表面にタングステンカーバイトの形成が阻
止できる。このためタングステンコイル3Aの表面にク
ラックが入ることがなくなり、グロープラグ自体の寿命
を大幅に進展させることができる。またこの事により低
セタン価燃料を使用するエンジンの信頼性を高める上で
その貢献が著しい。
The glow plug structure of the present invention can prevent the formation of tungsten carbide on the tungsten surface by depositing platinum on the surface of the tungsten coil by vapor deposition or the like. Therefore, the surface of the tungsten coil 3A is not cracked, and the life of the glow plug itself can be greatly extended. This also makes a significant contribution to enhancing the reliability of engines that use low cetane number fuels.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明に係る第1実施例の構造図FIG. 1 is a structural diagram of a first embodiment according to the present invention.

【図2】従来例の図1応当図FIG. 2 FIG. 1 corresponding diagram of a conventional example

【符号の説明】[Explanation of symbols]

3…タングステンコイル、3A…表面に白金を蒸発等で
付着させたタングステンコイル、b…グロープラグのセ
ラミック、e…グロープラグ本体下部。
3 ... Tungsten coil, 3A ... Tungsten coil with platinum adhering to the surface by evaporation or the like, b ... Glow plug ceramic, e ... Glow plug body lower part.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 後藤 敬造 長崎県長崎市深堀町5丁目717番1号 三 菱重工業株式会社長崎研究所内 (72)発明者 上原 勝景 長崎県長崎市深堀町5丁目717番地1 長 菱エンジニアリング株式会社内 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Keizo Goto 5-717-1, Fukahori-cho, Nagasaki-shi, Nagasaki Sanhishi Heavy Industries Ltd. Nagasaki Research Institute (72) Inventor Katsue Uehara 5-chome, Fukahori-cho, Nagasaki-shi, Nagasaki Prefecture Address 1 within Choryo Engineering Co., Ltd.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 発熱コイル材としてタングステンを使用
するセラミックプラグにおいて、該タングステン表面に
白金を蒸発等で付着させたタングステンコイル(3A)
を使用したことを特徴とするグロープラグ。
1. A ceramic plug using tungsten as a heating coil material, wherein a tungsten coil (3A) having platinum adhered to the surface of said tungsten by evaporation or the like.
Glow plug characterized by using.
JP4584593A 1993-02-10 1993-02-10 Structure of glow plug Withdrawn JPH06241451A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4584593A JPH06241451A (en) 1993-02-10 1993-02-10 Structure of glow plug

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4584593A JPH06241451A (en) 1993-02-10 1993-02-10 Structure of glow plug

Publications (1)

Publication Number Publication Date
JPH06241451A true JPH06241451A (en) 1994-08-30

Family

ID=12730553

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4584593A Withdrawn JPH06241451A (en) 1993-02-10 1993-02-10 Structure of glow plug

Country Status (1)

Country Link
JP (1) JPH06241451A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8319153B2 (en) 2008-11-17 2012-11-27 Federal-Mogul Italy Srl. Glow plug with metallic heater probe

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8319153B2 (en) 2008-11-17 2012-11-27 Federal-Mogul Italy Srl. Glow plug with metallic heater probe

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Legal Events

Date Code Title Description
A300 Withdrawal of application because of no request for examination

Free format text: JAPANESE INTERMEDIATE CODE: A300

Effective date: 20000509