JPS5936111B2 - glow plug - Google Patents
glow plugInfo
- Publication number
- JPS5936111B2 JPS5936111B2 JP12052075A JP12052075A JPS5936111B2 JP S5936111 B2 JPS5936111 B2 JP S5936111B2 JP 12052075 A JP12052075 A JP 12052075A JP 12052075 A JP12052075 A JP 12052075A JP S5936111 B2 JPS5936111 B2 JP S5936111B2
- Authority
- JP
- Japan
- Prior art keywords
- cylinder
- glow plug
- main body
- red
- internal combustion
- 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
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)
Description
【発明の詳細な説明】
本発明は圧縮点火内燃機関の低温始動時の点火補助装置
であるグロープラグの改良に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a glow plug which is an ignition assisting device during cold starting of a compression ignition internal combustion engine.
一般に圧縮点火内燃機関は、シリンダ内が低温の始動時
のみシリンダ内を加熱して始動させ、始動後は圧縮によ
り自動的に点火を繰り返えし、動作を続けるものである
。In general, a compression ignition internal combustion engine starts by heating the inside of the cylinder only when the cylinder is started at a low temperature, and after starting, the engine automatically repeats ignition due to compression and continues operation.
この圧縮点火内燃機関の始動時のシリンダ内の加熱方法
は種々の方法が提案されているがグロープラグを用いて
シリンダ内で直接赤熱する方法がもつとも確実ですぐれ
ている。Various methods have been proposed for heating the inside of the cylinder at the time of starting the compression ignition internal combustion engine, but the method of directly heating the inside of the cylinder using a glow plug is reliable and superior.
しかし、グロープラグは圧縮点火内燃機関の始動後もシ
リンダ内に突出しているから高温高圧の燃焼ガスに直接
さらされグロープラグの赤熱部が破損してしまうため耐
久性に問題があった。However, since the glow plug protrudes into the cylinder even after the compression ignition internal combustion engine is started, it is directly exposed to high temperature, high pressure combustion gas and the red hot part of the glow plug is damaged, which poses a problem in durability.
特に直噴式内燃機関ではその構造上、予燃焼室術は内燃
機関に用いられるようなグロープラグによる低温始動補
助装置を用いることは困難であり、このため従来は吸気
加熱方式等が採用されていた。Due to the structure of direct-injection internal combustion engines in particular, it is difficult to use the pre-combustion chamber technology with low-temperature starting aids using glow plugs like those used in internal combustion engines, and for this reason conventionally intake air heating methods have been adopted. .
しかし、吸気加熱方式はグロープラグを用いた方法に比
較して装置が複雑でしかも動作に安定性を欠くという欠
点があった。However, the intake air heating method has disadvantages in that the device is more complex and its operation is less stable than the method using glow plugs.
本発明は上記実状に鑑みてなされたもので、グロープラ
グの赤熱部を機関始動時のみシリンダ内に突出するよう
にし、機関始動開始後はグロープラグの赤熱部をシリン
ダ内から引き込み赤熱部を直接シリンダ内の高温高圧ガ
スにさらされないようにしてシリンダ内で直接用いても
十分の耐久性が得られるグロープラグを提供するもので
ある。The present invention was made in view of the above-mentioned circumstances, and the red-hot part of the glow plug is made to protrude into the cylinder only when the engine is started, and after the engine starts, the red-hot part of the glow plug is pulled in from inside the cylinder and the red-hot part is directly exposed to the cylinder. To provide a glow plug that is not exposed to high-temperature, high-pressure gas inside the cylinder and has sufficient durability even when used directly inside the cylinder.
以下、本発明を添付図面の一実施例に基づき詳細に説明
する。Hereinafter, the present invention will be described in detail based on one embodiment of the accompanying drawings.
第１図は本発明のグロープラグの一実施例を示した側断
面図である。FIG. 1 is a side sectional view showing an embodiment of the glow plug of the present invention.
赤熱部１は円筒形状で内部にヒータ２が配設され、先端
にカバー３を有するものであり、一端を可動円筒４に嵌
合固定する。The glowing part 1 has a cylindrical shape, has a heater 2 disposed therein, has a cover 3 at its tip, and has one end fitted and fixed to a movable cylinder 4.
可動円筒４の中心にはヒータ３に給電する電極５が配設
され、前記可動円筒４と電極５の間には絶縁体７が詰め
られ電極５と、可動円筒４は固定され、前記赤熱部１と
可動円筒４と電極５は１体になるように構成されている
。An electrode 5 for feeding power to the heater 3 is disposed at the center of the movable cylinder 4, an insulator 7 is packed between the movable cylinder 4 and the electrode 5, and the electrode 5 and the movable cylinder 4 are fixed, and the red-hot part 1, the movable cylinder 4, and the electrode 5 are constructed as one body.
電極５の一端は、本体８の上部の孔９に絶縁体１０を介
在して、嵌合し前記１体に構成された赤熱部１と可動円
筒４と電極５は図に示す方向Ｘに摺動可能なようになっ
ている。One end of the electrode 5 is fitted into a hole 9 in the upper part of the main body 8 with an insulator 10 interposed therebetween, and the incandescent part 1, the movable cylinder 4, and the electrode 5, which are constituted as one body, slide in the direction X shown in the figure. It is now movable.
前記可動円筒４と本体８の間にはシールリング６と複数
のシール１２によりシールされた気密室１３が設けられ
、この気密室には温度に対する膨張係数の大きな流動体
１４（例えばワックス等）が詰められている。An airtight chamber 13 sealed by a seal ring 6 and a plurality of seals 12 is provided between the movable cylinder 4 and the main body 8, and a fluid 14 having a large coefficient of expansion with respect to temperature (for example, wax) is contained in this airtight chamber. It's packed.
従って、温度が上昇すると気密室８内の流動体１４が膨
張し、可動円筒４を図に示すＸ方向に押し上げこれによ
り赤熱部１は本体８の内部に引き込まれるようになって
いる。Therefore, when the temperature rises, the fluid 14 in the airtight chamber 8 expands, pushing up the movable cylinder 4 in the X direction shown in the figure, thereby drawing the red-hot part 1 into the main body 8.
第２図は、上記実施例のグロープラグを直噴式圧縮点火
内燃機関に配設した場合を示すものでグロープラグ１５
は、内燃機関１９のシリンダブロック１６に配設される
。FIG. 2 shows a case where the glow plug of the above embodiment is installed in a direct injection compression ignition internal combustion engine.
is arranged in the cylinder block 16 of the internal combustion engine 19.
内燃機関１９はノズル１７から送入された燃焼ガスをピ
ストン１８により圧縮するようになっており、内燃機関
１９の始動時のシリンダ内の温度が低温のときはグロー
プラグ１５の赤熱部１はシリンダ内に突出し、（点線で
示す状態）燃焼ガスを加熱して始動を補助する。The internal combustion engine 19 is configured to compress the combustion gas sent from the nozzle 17 with the piston 18, and when the temperature inside the cylinder at the time of starting the internal combustion engine 19 is low, the red hot part 1 of the glow plug 15 is compressed by the cylinder. It protrudes inward (as shown by the dotted line) and heats the combustion gas to assist in starting.
しかし、内燃機関のシリンダ内の温度が上昇するとグロ
ープラグ１５内の第１図に示す流動体１４が膨張し、赤
熱部１はシリンダ内からグロープラグ１５内に引き込ま
れ、赤熱部１がシリンダ内の高温高圧の燃焼ガスに直接
さらされないようになる。However, when the temperature inside the cylinder of the internal combustion engine increases, the fluid 14 shown in FIG. Avoid direct exposure to high temperature, high pressure combustion gases.
またグロープラグの可動部に電気接点を設けることによ
りグロープラグの赤熱の必要がなくなった時点でヒータ
への通電を自動的に止めることも可能である。Furthermore, by providing an electrical contact on the movable part of the glow plug, it is possible to automatically stop the power supply to the heater when the glow plug no longer needs to glow.
以上説明したように本発明のグロープラグによれば、赤
熱部を気密室内に充填される流動体の熱膨張に応じて本
体との間に摺動可能に配設したため、前記シリンダ内が
予熱を必要とする低温度状態にある時には、前記赤熱部
をシリンダ内に突出せしめ点火補助を行うとともに、当
該点火後に予熱を必要としない高温度状態になった時に
は前記シリンダ内からこれを退没せしめるという動作を
当該シリンダ内の温度に応じた適切なタイミングにかつ
また人為的操作を要せず自動的に行うことができ、当該
赤熱部が前記シリンダ内において高温にさらされるのを
最小限に留め得ることによって当該赤熱部の寿命を著し
く長くすることができるという優れた効果を有する。As explained above, according to the glow plug of the present invention, the incandescent part is slidably disposed between the body and the body according to the thermal expansion of the fluid filled in the airtight chamber, so that the inside of the cylinder is not preheated. When the required low temperature is reached, the red-hot part is projected into the cylinder to assist in ignition, and when the temperature reaches a high temperature that does not require preheating after ignition, it is retracted from the cylinder. The operation can be performed automatically at an appropriate timing according to the temperature within the cylinder and without the need for human operation, and exposure of the red-hot part to high temperatures within the cylinder can be minimized. This has the excellent effect of significantly extending the life of the red-hot part.
第１図は本発明のグロープラグの一実施例を示す側断面
図、第２図は同実施例のグロープラグを直噴式圧縮点火
内燃機関に配設した側断面図である。
１・・・・・・赤熱部、２・・・・・・ヒータ、３・・
・・・・カバー、４・・・・・・可動円筒、５・・・・
・・電極、６・・・・・・シールリング、１２・・・・
・・シール、１３・・・・・・気密室、１４・・・・・
・熱膨張率の大きい流動体。FIG. 1 is a side sectional view showing one embodiment of a glow plug of the present invention, and FIG. 2 is a side sectional view showing the glow plug of the same embodiment installed in a direct injection compression ignition internal combustion engine. 1... Red hot part, 2... Heater, 3...
...Cover, 4...Movable cylinder, 5...
...Electrode, 6...Seal ring, 12...
...Seal, 13...Airtight room, 14...
・Fluid with a large coefficient of thermal expansion.
Claims (1)
点火を補助するグロープラグにおいて、一端に前記発熱
部が形成され本体に対して摺道自在に嵌設された赤熱部
と、該赤熱部と前記本体との間に形成され、熱膨張係数
の大きい流動体が充填されるとともに前記赤熱部の前記
本体内への引込みに応じて順次その有効体積が増大する
形状の気密室とを具え、前記シリンダ内の温度上昇に対
応する前記流動体の膨張により前記発熱部を前記シリン
ダ内から前記本体内に引込むようにしたことを特徴とす
るグロープラグ。1. A glow plug that protrudes a heat generating part into the cylinder of a compression ignition internal combustion engine to assist in ignition, comprising: a red hot part having the heat generating part formed at one end and slidably fitted into the main body; an airtight chamber formed between the main body and filled with a fluid having a large coefficient of thermal expansion, the effective volume of which increases sequentially as the red-hot part is drawn into the main body; A glow plug characterized in that the heat generating portion is drawn into the main body from within the cylinder by expansion of the fluid in response to a rise in temperature within the cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12052075A JPS5936111B2 (en) | 1975-10-06 | 1975-10-06 | glow plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12052075A JPS5936111B2 (en) | 1975-10-06 | 1975-10-06 | glow plug |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5244346A JPS5244346A (en) | 1977-04-07 |
| JPS5936111B2 true JPS5936111B2 (en) | 1984-09-01 |
Family
ID=14788270
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12052075A Expired JPS5936111B2 (en) | 1975-10-06 | 1975-10-06 | glow plug |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5936111B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH021773Y2 (en) * | 1984-03-21 | 1990-01-17 | ||
| JPH0345361Y2 (en) * | 1986-02-20 | 1991-09-25 | ||
| JPH0345362Y2 (en) * | 1986-03-25 | 1991-09-25 |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4397273A (en) * | 1981-04-20 | 1983-08-09 | General Motors Corporation | Retractable engine igniter |
| US4477717A (en) * | 1983-04-08 | 1984-10-16 | Wellman Thermal Systems Corporation | Fast start glow plug |
| DE102014220343A1 (en) * | 2014-10-08 | 2016-04-14 | Ford Global Technologies, Llc | Cylinder head for a diesel engine with direct injection |
-
1975
- 1975-10-06 JP JP12052075A patent/JPS5936111B2/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH021773Y2 (en) * | 1984-03-21 | 1990-01-17 | ||
| JPH0345361Y2 (en) * | 1986-02-20 | 1991-09-25 | ||
| JPH0345362Y2 (en) * | 1986-03-25 | 1991-09-25 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5244346A (en) | 1977-04-07 |
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