JPH027377A - Spark plug - Google Patents
Spark plugInfo
- Publication number
- JPH027377A JPH027377A JP15739788A JP15739788A JPH027377A JP H027377 A JPH027377 A JP H027377A JP 15739788 A JP15739788 A JP 15739788A JP 15739788 A JP15739788 A JP 15739788A JP H027377 A JPH027377 A JP H027377A
- Authority
- JP
- Japan
- Prior art keywords
- spark plug
- long leg
- leg portion
- leg length
- length part
- 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
- 229910052751 metal Inorganic materials 0.000 claims abstract description 21
- 239000002184 metal Substances 0.000 claims abstract description 21
- 239000012212 insulator Substances 0.000 claims abstract description 16
- 230000004323 axial length Effects 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 13
- 230000005684 electric field Effects 0.000 abstract description 3
- 238000001179 sorption measurement Methods 0.000 abstract description 2
- 238000012216 screening Methods 0.000 abstract 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 17
- 229910052697 platinum Inorganic materials 0.000 description 9
- 230000000694 effects Effects 0.000 description 5
- 238000009413 insulation Methods 0.000 description 5
- 239000000919 ceramic Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical group [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000012777 electrically insulating material Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 150000003057 platinum Chemical class 0.000 description 1
- 235000019353 potassium silicate Nutrition 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
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 238000010186 staining Methods 0.000 description 1
Landscapes
- Spark Plugs (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、内燃機関の点火に使用されるスパークプラグ
に係り、特に、スパークプラグのくすぶり汚損対策に関
する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a spark plug used for ignition of an internal combustion engine, and particularly to measures against smoldering and fouling of the spark plug.
［従来の技術］
スパークプラグの絶縁体には、主体金具との間に生じる
電界のため、エンジンの燃焼室内のカーボン粒子が引き
寄せられ、吸着されて堆積し、これに液状燃料が加わり
カーボン粒子がブリッジ状に並び、しだいにスパークプ
ラグの絶縁抵抗が低下してくる。[Prior Art] Due to the electric field generated between the spark plug insulator and the main metal fitting, carbon particles in the combustion chamber of the engine are attracted, adsorbed and deposited, and when liquid fuel is added to this, the carbon particles are They line up in a bridge shape, and the insulation resistance of the spark plug gradually decreases.
従来、カーボンが吸着されても絶縁抵抗が低下しないよ
うにプラグの脚長部を長くして絶縁バスを確保したプラ
グを使用し、プラグの汚損対策を図っていた。Conventionally, plugs have been used that have longer legs to ensure an insulating bus so that the insulation resistance does not decrease even when carbon is adsorbed, thereby preventing the plug from becoming contaminated.
［発明が解決しようとする課題］
しかるに、同一エンジンにこのようなスパークプラグを
使用すると、低熱価タイプ＜ｖｔけ型；Ｈｏｔ Ｔｙ
ｐｅ）となり、耐ブレイグニション性を悪化させてしま
うという欠点があった。[Problem to be solved by the invention] However, when such a spark plug is used in the same engine, the low heat value type<vt type; Hot Ty
pe), which has the disadvantage of deteriorating Breignion resistance.
本発明の目的は、脚長部の長さ（熱価）を変えず、耐カ
ーボン汚損性に優れたスパークプラグの提供にある。An object of the present invention is to provide a spark plug that does not change the length (thermal value) of the long leg portion and has excellent carbon fouling resistance.
［課題を解決するための手段］
上記目的を達成するため、本発明は、軸心に中心電極が
貫いて設けられた棒状を呈するとともに、頭部、やや径
大の胴部、やや径小の脚長部を有する絶縁体を、前記胴
部と脚長部とを包む筒状主体金具に嵌め込み、中心電極
の先端と前記主体金具の先端に設けた接地電極との間に
火花放電間隙を形成してなるスパークプラグにおいて、
前記脚長部の壁内に、主体金具と電気的に導通が図られ
た静電遮蔽層を形成した構成、および前記静電遮蔽層は
、脚長部の長さｌ、と、前記静電遮蔽層の軸方向の長さ
１との関係、Ｌ−１を３ｍｍ以上り未満とし、前記脚長
部の肉厚］゛と、脚長部の外周と静電遮蔽層の内周まで
の距離ｔとの関係、Ｔ・−ｔを１ｍｍ以上Ｔ未満とした
構成を採用した。[Means for Solving the Problems] In order to achieve the above object, the present invention has a rod shape with a center electrode penetrating the axis, a head, a body with a slightly larger diameter, and a body with a slightly smaller diameter. An insulator having a long leg portion is fitted into a cylindrical metal shell that encloses the body portion and the long leg portion, and a spark discharge gap is formed between a tip of a center electrode and a ground electrode provided at a tip of the metal shell. In the spark plug,
An electrostatic shielding layer electrically connected to the metal shell is formed in the wall of the long leg portion, and the electrostatic shielding layer has a length l of the long leg portion and the electrostatic shielding layer. The relationship between the length 1 in the axial direction of L-1 and the thickness of the long leg portion] and the distance t from the outer periphery of the long leg portion to the inner periphery of the electrostatic shielding layer, where L-1 is greater than or equal to 3 mm and less than 3 mm. , T·-t was set to 1 mm or more and less than T.
［作用および発明の効果］
本発明のスパークプラグは、次の作用および効果を生じ
る。[Actions and Effects of the Invention] The spark plug of the present invention produces the following actions and effects.
く請求項１の作用効果〉
脚長部の壁内に、主体金具と電気的に導通が図られた静
電遮蔽層を形成している。このため、プラグの放電時に
、脚長部表面に電界が生じ難くなる。よって脚長部の長
さしの延出を伴わずにカーボンの吸着による絶縁体の汚
損が防止できる。Effects of Claim 1> An electrostatic shielding layer electrically connected to the metal shell is formed within the wall of the long leg portion. Therefore, when the plug discharges, an electric field is less likely to be generated on the surface of the long leg portion. Therefore, staining of the insulator due to adsorption of carbon can be prevented without increasing the length of the long leg portion.
（ｊｌ請求項の作用効果〉
静電遮蔽層は、脚長部の長さしと、前記静電遮蔽層の軸
方向の長さ１との関係、ｔ、−ｎを３ｍｍ以上り未満と
し、脚長部の肉厚Ｔと、脚長部の外周と静電遮蔽層の内
周までの距離ｔとの関係、Ｔ−ｔを１ｍｍ以上Ｔ未満と
している。このため中心電極と静電遮蔽層との絶縁距離
が十分に収れ、絶縁破壊が起きにくい、ここで数値限定
の理由は、Ｌ、 −Ｊが３ｍｍ未満であると中心電極と
の絶縁性が低下し、Ｌである（静電遮蔽層が形成されて
いない状態）と効果がない、ｔ’−ｔが１ｍｍ未満であ
ると中心電極と貫通しやすくなり、Ｔである（脚長部の
外周に静電遮蔽層が形成されている状Ｒ）と放電が静電
遮蔽層に起きてしまうためである。(Function and effect of jl claim) The electrostatic shielding layer has a relationship between the length of the leg portion and the axial length 1 of the electrostatic shielding layer, t, -n, which is 3 mm or more and less than 3 mm, and the leg length is The relationship between the wall thickness T of the long leg part and the distance t from the outer periphery of the long leg part to the inner periphery of the electrostatic shielding layer, T-t, is set to 1 mm or more and less than T. Therefore, the insulation between the center electrode and the electrostatic shielding layer is The reason for the numerical limitation here is that the distance is sufficiently short and dielectric breakdown is unlikely to occur.If L and -J are less than 3 mm, the insulation with the center electrode will decrease; If t'-t is less than 1 mm, it will easily penetrate the center electrode, and it will be T (state R where an electrostatic shielding layer is formed on the outer periphery of the long leg part). This is because discharge occurs in the electrostatic shielding layer.
［実施例］ つぎに本発明を図面に示す一実施例に基づき説明する。[Example] Next, the present invention will be explained based on an embodiment shown in the drawings.
本発明のスパークプラグＳは、筒状主体金具１内に、軸
心に中心型ＩＥ４２が貫設された絶縁体３を嵌め込んで
なり、主体金具１の先端の接地電極１１と中心電極２の
先端との間に火花放電間隙４を形成している。The spark plug S of the present invention is made up of a cylindrical metal shell 1 and an insulator 3 having a central IE 42 inserted through its axis. A spark discharge gap 4 is formed between the tip and the tip.
主体金具１は、スパークプラグＳのハウジングを兼ねた
円筒状の炭素鋼で形成され、先端は、前記絶縁体３の先
端を覆うように張り出し接地電極１１となり、中心電極
２の先端面２１近傍まで曲げられている。The metal shell 1 is made of cylindrical carbon steel and also serves as a housing for the spark plug S, and its tip protrudes to cover the tip of the insulator 3 and serves as a ground electrode 11, extending to the vicinity of the tip surface 21 of the center electrode 2. It's bent.
中心電極２は、ニッケル合金からなり、先端面２１が絶
縁体３の先端面３１より数ｍｍ突き出して配設され、他
端には鍔部２２を備えて導電性がガラスシール材２３を
介して端子電極２４とともに一体に封着されている。The center electrode 2 is made of a nickel alloy, has a distal end 21 protruding from the distal end 31 of the insulator 3 by several mm, and has a flange 22 at the other end so that conductivity is maintained through a glass sealing material 23. It is sealed together with the terminal electrode 24.
絶縁体３は、アルミナ等の焼結体でできており、先端に
位置する脚長部３２は径小となり、後端はコルゲーショ
ンが形成されている頭部３３となり、中間はやや径大の
胴部３４となっている。この脚長部３２と胴部３４とは
前記主体金具１に包まれている０脚長部３２にはアルミ
ナ等の電気絶縁性材料で形成されたキャップ５が外嵌さ
れている。The insulator 3 is made of a sintered body such as alumina, and has a long leg portion 32 located at the tip with a small diameter, a corrugated head portion 33 at the rear end, and a body portion with a slightly larger diameter in the middle. It is 34. The long leg portion 32 and the body portion 34 are surrounded by the metal shell 1. A cap 5 made of an electrically insulating material such as alumina is fitted onto the long leg portion 32.
このキャップ５の内周には、脚長部３２の長さしと軸方
向の白金ペースト層５１（静電遮蔽層）の長さ１との関
係、［、−１が５ｍｍとなるように白金ペーストＮｌｌ
５１がキャップ５の外周まで延長され、焼き付けられて
形成されている。この白金ペースト層５１は、キャップ
５内にパツキン面５２で前記主体金具１に圧接され電気
的導通が図られている。また、脚長部３２の肉厚Ｔと、
脚長部３２の外周と白金ペースト層５１の内周までの距
離ｔとの関係、Ｔ−ｔは２’ｍｍとされている。また、
キャップ５先端と絶縁体３との間隙には、アルミすと水
ガラスを混練した耐熱性と電気絶縁性を有するセラミッ
クペースト４３でシールされている。The inner periphery of the cap 5 is coated with platinum paste so that the relationship between the length of the long leg portion 32 and the length 1 of the platinum paste layer 51 (electrostatic shielding layer) in the axial direction is 5 mm. Nll
51 is extended to the outer periphery of the cap 5 and is formed by baking. This platinum paste layer 51 is pressed into contact with the metal shell 1 at a packing surface 52 within the cap 5 to establish electrical continuity. In addition, the wall thickness T of the long leg portion 32,
The relationship between the distance t between the outer periphery of the long leg portion 32 and the inner periphery of the platinum paste layer 51, T-t, is 2' mm. Also,
The gap between the tip of the cap 5 and the insulator 3 is sealed with a heat-resistant and electrically insulating ceramic paste 43 made by kneading aluminum and water glass.
このセラミックペースト４３は充填後加熱して硬化され
る。追記するが、脚長部３２は熱価５に相当する長さで
ある。なお、生素地に白金ペーストを塗布したキャップ
５と生素地の絶縁体３を嵌合した後、焼成して一体に形
成したものであっても良い。After filling, this ceramic paste 43 is heated and hardened. As an additional note, the leg length portion 32 has a length corresponding to a heat value of 5. Alternatively, the cap 5, which is made of a green material coated with platinum paste, and the green insulator 3 may be fitted together and then fired to be integrally formed.
火花放電間隙４は、中心型！ｌ１ｔ２の先端面２１と接
地電極１１内周との間で形成されている。Spark discharge gap 4 is central type! It is formed between the tip surface 21 of l1t2 and the inner circumference of the ground electrode 11.
本実施例は、次の作用および効果を有する。This embodiment has the following functions and effects.
（ア）本実施例のスパークプラグＳは、第４図（スパー
クプラグＳ）および第５図（本発明を施さない同熱価の
スパークプラグ）のグラフに示すように、カーボン汚損
が発生しやすい条件（室温が一１０℃でアイドリングと
低速を組合わせたパターン運転）を設定して耐カーボン
汚損試験を行ったところ、カーボン等の付着による絶縁
抵抗値の低下がなだらかであり、耐汚損性に優れる。(A) The spark plug S of this example is susceptible to carbon contamination, as shown in the graphs of Fig. 4 (spark plug S) and Fig. 5 (spark plug of the same thermal value not applied with the present invention). When we conducted a carbon stain resistance test under the following conditions (temperature: -10°C, patterned operation combining idling and low speed), we found that the insulation resistance value decreased gradually due to adhesion of carbon, etc., indicating that the stain resistance was Excellent.
（イ）白金ペースト層５１を絶縁体３の脚長部３２にキ
ャップ５を外嵌して形成しているので、その形成が容易
に行える。(a) Since the platinum paste layer 51 is formed by fitting the cap 5 onto the long leg portion 32 of the insulator 3, it can be easily formed.
（つ）絶縁体３のａ置部３２の先端部の内部には白金ペ
ースト層５１が形成されていないためカーボンが吸着さ
れるが、主体金具１との間隔が離れているのとプラグの
自己清浄作用によりこの部分の汚損は問題とならない。(1) Since the platinum paste layer 51 is not formed inside the tip of the a-placement part 32 of the insulator 3, carbon is adsorbed, but carbon is adsorbed due to the distance from the main metal fitting 1 and the self-alignment of the plug. Due to the cleaning action, contamination of this area will not be a problem.
本発明は上記実施例以外に次の実施態様を含む。The present invention includes the following embodiments in addition to the above embodiments.
ａ、上記実施例で、白金ペースト層５１は、絶縁体３の
脚長部３２の外周に形成してキャップ５を外嵌しても良
い。a. In the above embodiment, the platinum paste layer 51 may be formed on the outer periphery of the long leg portion 32 of the insulator 3, and the cap 5 may be fitted onto the outer circumference of the leg portion 32.
ｂ、静電遮蔽層は、モリブデン（Ｍｏ）、銀（Ａｇ）＄
を含有した導電性ペーストであっても良く、これらの金
属の粉末または金属箔を被着して焼き付けても良く、拡
散焼付けしても良い。b. The electrostatic shielding layer is molybdenum (Mo), silver (Ag) $
It may be a conductive paste containing these metals, powder or metal foil of these metals may be applied and baked, or diffusion baking may be carried out.
Ｃ，セラミックペースト５３は、ジルコニア、シリカ（
ＳｉＣｈ）等を含んだものであっても良い。C. Ceramic paste 53 is made of zirconia, silica (
It may also contain SiCh) or the like.
第１図は本発明のスパークプラグの部分断面図、第２図
はその要部拡大図、第３図は静電遮蔽層の形成（ｉ７ｉ
ｆｆ関係を示す断面図である。第４１ｆｆｉＩは本発明
のスパークプラグの耐カーボン汚損試験結果を示すグラ
フである。第５図は本発明を施さない同熱価のスパーク
プラグの耐カーボン汚損試験結果を示すグラフである。
図中 １・・・筒状主体金具 ２・・・中心電極 ３・
・・絶縁体 ４・・・火花放電間隙 １１・・・接地電
極 ２１・・・中心電極の先端面 ３２・・・脚長部
３３・・・頭部 ３４・・・胴部 ５１・・・白金ペー
ストＷＪ（静電遮蔽層） し・・・脚長部の長さ １・
・・静電遮蔽層の軸方向の長さ １゛・・・脚長部の肉
厚 ｔ・・・脚長部の外周と静電遮蔽層の内周までの距
１ｓ・・・スパークプラグ
第１図Fig. 1 is a partial sectional view of the spark plug of the present invention, Fig. 2 is an enlarged view of its main parts, and Fig. 3 is the formation of an electrostatic shielding layer (i7i
FIG. 3 is a cross-sectional view showing the ff relationship. No. 41ffiI is a graph showing the carbon stain resistance test results of the spark plug of the present invention. FIG. 5 is a graph showing the results of a carbon stain resistance test of spark plugs having the same heat value and not subjected to the present invention. In the figure 1... Cylindrical main metal fitting 2... Center electrode 3.
... Insulator 4 ... Spark discharge gap 11 ... Ground electrode 21 ... Tip surface of center electrode 32 ... Long leg part
33... Head 34... Torso 51... Platinum paste WJ (electrostatic shielding layer)... Length of long leg portion 1.
...Length in the axial direction of the electrostatic shielding layer 1゛...Thickness of the long leg part t...Distance between the outer circumference of the long leg part and the inner circumference of the electrostatic shielding layer 1s...Spark plug Figure 1
Claims (1)
ともに、頭部、やや径大の胴部、やや径小の脚長部を有
する絶縁体を、前記胴部と脚長部とを包む筒状主体金具
に嵌め込み、中心電極の先端と前記主体金具の先端に設
けた接地電極との間に火花放電間隙を形成してなるスパ
ークプラグにおいて、 前記脚長部の壁内に、主体金具と電気的に導通が図られ
た静電遮蔽層を形成したことを特徴とするスパークプラ
グ。 ２）前記静電遮蔽層は、脚長部の長さＬと、前記静電遮
蔽層の軸方向の長さｌとの関係、Ｉ−ｌを３ｍｍ以上Ｌ
未満とし、前記脚長部の肉厚Ｔと、脚長部の外周と静電
遮蔽層の内周までの距離ｔとの関係、Ｔ−ｔを１ｍｍ以
上Ｔ未満とした請求項１記載のスパークプラグ。[Scope of Claims] 1) An insulator having a rod shape with a center electrode extending through the axis, and having a head, a body with a slightly larger diameter, and long legs with a slightly smaller diameter, is connected to the body. In the spark plug, the spark plug is fitted into a cylindrical metal shell surrounding a long leg portion, and a spark discharge gap is formed between a tip of a center electrode and a ground electrode provided at the tip of the metal shell, the spark plug having a spark discharge gap formed within a wall of the long leg portion. , a spark plug characterized by forming an electrostatic shielding layer that is electrically conductive with the metal shell. 2) The electrostatic shielding layer has a relationship between the length L of the long leg portion and the axial length l of the electrostatic shielding layer, and the relationship I-l is 3 mm or more L.
2. The spark plug according to claim 1, wherein the relationship between the wall thickness T of the long leg portion and the distance t between the outer periphery of the long leg portion and the inner periphery of the electrostatic shielding layer, T-t, is 1 mm or more and less than T.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63157397A JP2721354B2 (en) | 1988-06-25 | 1988-06-25 | Spark plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63157397A JP2721354B2 (en) | 1988-06-25 | 1988-06-25 | Spark plug |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH027377A true JPH027377A (en) | 1990-01-11 |
| JP2721354B2 JP2721354B2 (en) | 1998-03-04 |
Family
ID=15648740
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63157397A Expired - Lifetime JP2721354B2 (en) | 1988-06-25 | 1988-06-25 | Spark plug |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2721354B2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS625582A (en) * | 1985-06-28 | 1987-01-12 | 株式会社日本自動車部品総合研究所 | Spark plug |
-
1988
- 1988-06-25 JP JP63157397A patent/JP2721354B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS625582A (en) * | 1985-06-28 | 1987-01-12 | 株式会社日本自動車部品総合研究所 | Spark plug |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2721354B2 (en) | 1998-03-04 |
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