JPH1113613A - Manufacture of spark plug, manufacture of cylinder head, and manufacture of engine - Google Patents
Manufacture of spark plug, manufacture of cylinder head, and manufacture of engineInfo
- Publication number
- JPH1113613A JPH1113613A JP9168659A JP16865997A JPH1113613A JP H1113613 A JPH1113613 A JP H1113613A JP 9168659 A JP9168659 A JP 9168659A JP 16865997 A JP16865997 A JP 16865997A JP H1113613 A JPH1113613 A JP H1113613A
- Authority
- JP
- Japan
- Prior art keywords
- spark plug
- screw
- ground electrode
- cylinder head
- metal shell
- 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
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Combustion Methods Of Internal-Combustion Engines (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Spark Plugs (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、スパークプラグ、
シリンダヘッド、またはエンジンの製造方法に関し、特
にスパークプラグの取付け個所の製造方法に関するもの
である。これによって、スパークプラグをシリンダヘッ
ドに所定トルクによって装着した際における接地電極の
方向を、エンジン内部における混合気のスワールの方向
に対し、火花放電ギャップが接地電極の陰になるかある
いは接地電極が火炎成長を妨げるような方向に存在しな
いようにするものである。即ち、混合気の燃焼を妨げな
い向きに合わせることを容易にするものである。TECHNICAL FIELD The present invention relates to a spark plug,
The present invention relates to a method for manufacturing a cylinder head or an engine, and more particularly to a method for manufacturing a mounting portion of a spark plug. As a result, the direction of the ground electrode when the spark plug is mounted on the cylinder head with a predetermined torque, the spark discharge gap is shaded by the ground electrode or the ground electrode It does not exist in a direction that hinders growth. That is, it is easy to adjust the mixture so as not to hinder the combustion of the air-fuel mixture.
【０００２】[0002]
【従来の技術】従来より、スパークプラグは、図６に示
すように、ネジを転造する前の主体金具９００の金具先
端面９０１に接地電極９０２を溶接し｛図６の
（ａ）｝、この主体金具９００に雄ネジ９０３を転造し
た後｛図６の（ｂ）｝、中心電極等を固定した絶縁碍子
を主体金具９００内に装着して製造される。また、シリ
ンダヘッドは、スパークプラグを装着する位置に貫通下
孔及びスパークプラグ装着座面を形成した後、ネジ切り
タップを用いて該貫通下孔にネジ切りを行いスパークプ
ラグ装着孔を明けることによって製造される。2. Description of the Related Art Conventionally, as shown in FIG. 6, a ground electrode 902 is welded to a metal fitting end surface 901 of a metal shell 900 before thread rolling as shown in FIG. 6 (FIG. 6 (a)). After the male screw 903 is rolled into the metal shell 900 (FIG. 6B), an insulator having a center electrode and the like fixed thereto is mounted in the metal shell 900 to manufacture. Further, the cylinder head is formed by forming a through hole and a spark plug mounting seat surface at a position where the spark plug is mounted, and then threading the through hole with a threading tap to make a spark plug mounting hole. Manufactured.
【０００３】一方、エンジンにおいて、スパークプラグ
によってシリンダ内の混合気に着火・燃焼させるために
は、火花放電ギャップ近傍での混合気に着火させるのみ
でなく、着火した火種からシリンダ内の混合気に対し速
やかに燃焼を伝播させることが重要である。そのために
は、火花放電ギャップの周囲に混合気をスムーズに供給
させなければならない。しかし、中心電極の側方に接地
電極９０２が存在するため、混合気の流れあるいは火炎
成長に対する妨げとなる場合がある。On the other hand, in the engine, in order to ignite and burn the air-fuel mixture in the cylinder by the spark plug, not only the air-fuel mixture in the vicinity of the spark discharge gap is ignited, but also the air-fuel mixture in the cylinder is ignited from the ignited spark. It is important to propagate the combustion quickly. For that purpose, the air-fuel mixture must be supplied smoothly around the spark discharge gap. However, the presence of the ground electrode 902 on the side of the center electrode may hinder the flow of the air-fuel mixture or the growth of the flame.
【０００４】即ち、インレッドバルブ（図示せず）を介
して吸入された混合気によって生じるスワールの方向に
対し、火花放電ギャップが接地電極９０２の陰になるか
あるいは接地電極が火炎成長を妨げる方向に存在する場
合にはスパークプラグの着火性を低下させる原因とな
る。従って、スワール方向と接地電極方向とは着火性に
関して密接な関係にあり、エンジン性能を十分引き出す
には、接地電極９０２が適切な位置に固定されることが
必要である。That is, with respect to the direction of swirl caused by the air-fuel mixture sucked through an in-red valve (not shown), the spark discharge gap is shaded by the ground electrode 902 or the direction in which the ground electrode prevents flame growth. When it exists in a spark plug, it becomes a cause to reduce the ignitability of a spark plug. Therefore, the swirl direction and the direction of the ground electrode are closely related to the ignitability, and the ground electrode 902 needs to be fixed at an appropriate position in order to sufficiently bring out the engine performance.
【０００５】しかし、主体金具９００に雄ネジ９０３を
転造する場合には、ローラの回転の遊びにより、接地電
極９０２に対するネジの切り出し位置を固定させること
ができない。また、シリンダヘッドにスパークプラグ装
着孔を形成する場合には、タップのすべりにより、スパ
ークプラグ装着座面に対するネジの相対的切り始め位置
を固定させることができない。However, when the male screw 903 is rolled on the metal shell 900, the cutout position of the screw with respect to the ground electrode 902 cannot be fixed due to the play of the rotation of the roller. In addition, when the spark plug mounting hole is formed in the cylinder head, the relative starting position of the screw relative to the spark plug mounting seat cannot be fixed due to the slip of the tap.
【０００６】このため、従来より、ベンチテスト等での
実験評価時には、スパークプラグの締め付けトルク（締
め付け回転角）を調整することで接地電極９０２の位置
を合わせていた。若しくは、同様のスパークプラグを多
数製作しておき、その中から接地電極９０２の位置が混
合気の燃焼を妨げないような位置にあるスパークプラグ
を選択して装着していた。For this reason, the position of the ground electrode 902 has conventionally been adjusted by adjusting the tightening torque (tightening rotation angle) of the spark plug at the time of an experimental evaluation such as a bench test. Alternatively, a large number of similar spark plugs are manufactured, and a spark plug whose position of the ground electrode 902 does not hinder the combustion of the air-fuel mixture is selected and mounted.
【０００７】[0007]
【発明が解決しようとする課題】しかし、締め付けるト
ルク（回転角）を変えて接地電極９０２の位置を合わせ
ると以下の不具合が生じる場合がある。即ち、スパーク
プラグ発火部の突き出し位置が気筒毎に変わるため、各
気筒に同種類のスパークプラグを使用しても突き出し位
置に起因する着火性に差が生じ易い。However, if the position of the ground electrode 902 is adjusted by changing the tightening torque (rotation angle), the following problems may occur. That is, since the projecting position of the spark plug firing portion changes for each cylinder, even if the same type of spark plug is used for each cylinder, a difference in ignitability due to the projecting position is likely to occur.
【０００８】また、スパークプラグの締め付けトルクを
変えることによって各気筒毎に接地電極９０２の方向を
合わせる作業を生産ラインにおいて行うことは、作業に
非常に手間がかかるため実用的ではない。一方、同種類
のスパークプラグを多数製作してその中から選択する場
合には、使用されないスパークプラグが多数製作され無
駄が多い。Further, it is not practical to perform the work of adjusting the direction of the ground electrode 902 for each cylinder on the production line by changing the tightening torque of the spark plug, because the work is extremely troublesome. On the other hand, when a large number of spark plugs of the same type are manufactured and selected from among them, a large number of unused spark plugs are manufactured and wasteful.
【０００９】本発明の第１の目的は、同一の締め付けト
ルクを加えてスパークプラグをシリンダヘッドに螺着し
たときに、スパークプラグの接地電極の方向を、エンジ
ン内部における混合気のスワールの方向に対し火花放電
ギャップが接地電極の陰になるかあるいは接地電極が火
炎成長を妨げる方向に存在しないようにすることが容易
にできるスパークプラグの製造方法の提供にある。A first object of the present invention is to change the direction of the ground electrode of the spark plug to the direction of the swirl of the air-fuel mixture inside the engine when the same tightening torque is applied and the spark plug is screwed into the cylinder head. On the other hand, it is an object of the present invention to provide a method of manufacturing a spark plug which can easily prevent a spark discharge gap from shadowing a ground electrode or preventing the ground electrode from being present in a direction that hinders flame growth.
【００１０】本発明の第２の目的は、同一の締め付けト
ルクを加えてスパークプラグをシリンダヘッドに螺着し
たときに、スパークプラグの接地電極の方向を、エンジ
ン内部における混合気のスワールの方向に対し火花放電
ギャップが接地電極の陰になるかあるいは接地電極が火
炎成長を妨げる方向に存在しないようにすることが容易
にできるシリンダヘッドの製造方法の提供にある。A second object of the present invention is to change the direction of the ground electrode of the spark plug to the direction of the swirl of the air-fuel mixture inside the engine when the same tightening torque is applied and the spark plug is screwed into the cylinder head. On the other hand, it is an object of the present invention to provide a method of manufacturing a cylinder head in which a spark discharge gap is easily shaded by a ground electrode or the ground electrode does not exist in a direction that hinders flame growth.
【００１１】本発明の第３の目的は、同一の締め付けト
ルクを加えてスパークプラグをシリンダヘッドに螺着し
たときに、スパークプラグの接地電極の方向を、エンジ
ン内部における混合気のスワールの方向に対し火花放電
ギャップが接地電極の陰になるかあるいは接地電極が火
花成長を妨げる方向に存在しないようにすることが容易
にできるエンジンの製造方法の提供にある。A third object of the present invention is to change the direction of the ground electrode of the spark plug to the direction of the swirl of the mixture in the engine when the same tightening torque is applied and the spark plug is screwed into the cylinder head. An object of the present invention is to provide a method of manufacturing an engine that can easily prevent a spark discharge gap from shadowing a ground electrode or prevent the ground electrode from being present in a direction that prevents spark growth.
【００１２】[0012]
【課題を解決するための手段】上記課題を解決するた
め、本発明は、以下の構成を採用した。 （１）主体金具にネジを螺刻した後、雌ネジを螺刻され
た治具に該主体金具を螺着し、前記治具の所定位置に対
応する主体金具の端面に接地電極を接続することによっ
てネジ首部におけるネジの切り始め位置に対する接地電
極の相対位置を一定にする。In order to solve the above problems, the present invention employs the following constitution. (1) After screwing a screw on the metal shell, the metal shell is screwed on a jig threaded with a female screw, and a ground electrode is connected to an end face of the metal shell corresponding to a predetermined position of the jig. By doing so, the relative position of the ground electrode with respect to the screw cutting start position at the screw neck is made constant.
【００１３】（２）スパークプラグを装着する位置に貫
通下孔及びスパークプラグ装着座面を形成した後、該貫
通下孔の内壁面における前記装着座面から所定距離Ｘ燃
焼室方向に進んだ位置からネジを切り始めてスパークプ
ラグ装着孔を形成することによってスパークプラグ装着
座面に対するネジの相対的切り始め位置を一定にする。(2) After forming a through hole and a spark plug mounting seat surface at the position where the spark plug is mounted, a position on the inner wall surface of the through hole that is a predetermined distance from the mounting seat surface in the direction of the combustion chamber. By starting the cutting of the screw from above to form the spark plug mounting hole, the relative screw starting position with respect to the spark plug mounting seat surface is made constant.
【００１４】（３）スパークプラグの主体金具にネジを
螺刻した後、雌ネジを螺刻された治具に該主体金具を螺
着し、前記治具の所定位置に対応する主体金具の端面に
接地電極を接続してスパークプラグを製造するととも
に、シリンダヘッドのスパークプラグを装着する位置に
貫通下孔及びスパークプラグ装着座面を形成した後、該
貫通下孔の内壁面における前記装着座面から所定距離Ｘ
燃焼室方向に進んだ位置からネジを切り始めてスパーク
プラグ装着孔を形成してシリンダヘッドを製造し、該ス
パークプラグ装着孔に前記スパークプラグを装着するこ
とによって、スパークプラグをシリンダヘッドに所定ト
ルクによって装着した際における接地電極の方向を、エ
ンジン内部における混合気のスワールの方向に対し、火
花放電ギャップが接地電極の陰になるかあるいは接地電
極が火炎成長を妨げる方向に存在しないようにする。(3) After screwing a screw on the metal shell of the spark plug, the metal shell is screwed on a jig threaded with a female screw, and an end face of the metal shell corresponding to a predetermined position of the jig. After a spark plug is manufactured by connecting a ground electrode to the spark plug and a through hole and a spark plug mounting seat surface are formed at a position where the spark plug is mounted on the cylinder head, the mounting seat surface on the inner wall surface of the through hole is formed. A predetermined distance X from
Starting to cut a screw from a position advanced in the direction of the combustion chamber to form a spark plug mounting hole to manufacture a cylinder head, and mounting the spark plug in the spark plug mounting hole, the spark plug is applied to the cylinder head by a predetermined torque. The direction of the ground electrode when installed is such that the spark discharge gap does not shade the ground electrode or the ground electrode does not exist in the direction that hinders the flame growth with respect to the direction of the swirl of the air-fuel mixture inside the engine.
【００１５】[0015]
〔請求項１について〕主体金具にネジを螺刻した後、雌
ネジを螺刻された治具に該主体金具を螺着し、前記治具
の所定位置に対応する主体金具の端面に接地電極を接続
する。これによってネジ首部におけるネジの切り始め位
置に対する接地電極の相対位置を一定にすることができ
る。[Claim 1] After screwing a screw on a metal shell, the metal shell is screwed on a jig threaded with a female screw, and a ground electrode is attached to an end surface of the metal shell corresponding to a predetermined position of the jig. Connect. Thus, the relative position of the ground electrode with respect to the screw cutting start position at the screw neck can be made constant.
【００１６】スパークプラグをシリンダヘッドに装着し
た際に、前述のように、エンジン内部における混合気の
スワールの方向に対し火花放電ギャップが接地電極の陰
になるかあるいは接地電極が火炎成長を妨げないように
することが望ましい。When the spark plug is mounted on the cylinder head, as described above, the spark discharge gap is shaded by the ground electrode in the direction of the swirl of the air-fuel mixture inside the engine, or the ground electrode does not hinder the flame growth. It is desirable to do so.
【００１７】しかし、スパークプラグはネジの切り始め
に対する接地電極の位置が一定せず、また、シリンダヘ
ッドはスパークプラグ装着座面に対するネジの相対的切
り始め位置が一定しないため、シリンダヘッドにスパー
クプラグを装着すると接地電極の方向は区々となる。こ
のため、接地電極が混合気の燃焼を妨げないように設定
することは非常に困難となる。However, in the spark plug, the position of the ground electrode with respect to the start of cutting the screw is not constant, and in the cylinder head, the position of the start of cutting the screw relative to the mounting surface of the spark plug is not constant. Is attached, the direction of the ground electrode varies. For this reason, it is very difficult to set the ground electrode so as not to hinder the combustion of the air-fuel mixture.
【００１８】ネジの切り始め位置が一定しないシリンダ
ヘッドに、本発明にかかる製造方法によってネジの切り
始め位置に対する接地電極の相対位置を種々変えて製作
したスパークプラグのうちの一種類を装着する。この
時、接地電極の方向をチュックしておく。このスパーク
プラグの接地電極が、混合気の燃焼を妨げる位置にある
スパークプラグの場合には、チェックしておいた接地電
極の方向と異なる混合気の燃焼を妨げない位置にあるス
パークプラグを選択すれば良い。これによって、接地電
極が混合気の燃焼を妨げない位置にあるスパークプラグ
を選択することが容易となる。One of the spark plugs manufactured by changing the relative position of the ground electrode with respect to the screw cutting start position by the manufacturing method according to the present invention is mounted on the cylinder head whose screw cutting start position is not constant. At this time, the direction of the ground electrode is checked. In the case where the ground electrode of the spark plug is located at a position that prevents combustion of the air-fuel mixture, a spark plug located at a position that does not hinder combustion of the air-fuel mixture that is different from the direction of the ground electrode that has been checked should be selected. Good. Thereby, it becomes easy to select a spark plug in a position where the ground electrode does not hinder the combustion of the air-fuel mixture.
【００１９】〔請求項２について〕スパークプラグを装
着する貫通下孔及びスパークプラグの装着座面を形成し
た後、該貫通下孔の内壁面における前記装着座面から所
定距離Ｘ燃焼室方向に進んだ位置からネジを切り始めて
スパークプラグ装着孔を形成する。これによってスパー
クプラグ装着座面に対するネジの相対的切り始め位置を
一定にすることができる。[Claim 2] After a through hole for mounting a spark plug and a mounting seat surface for the spark plug are formed, the inner wall surface of the through hole advances a predetermined distance X from the mounting seat surface in the direction of the combustion chamber. Start to cut the screw from the center position to form the spark plug mounting hole. As a result, the relative cutting start position of the screw with respect to the spark plug mounting seat surface can be made constant.
【００２０】スパークプラグをシリンダヘッドに装着し
た際における接地電極の方向は、前述のように、エンジ
ン内部における混合気のスワールの方向に対し火花放電
ギャップが接地電極の陰になるかあるいは接地電極が火
炎成長を妨げる方向に存在しないようにすることが望ま
しい。As described above, the direction of the ground electrode when the spark plug is mounted on the cylinder head is such that the spark discharge gap is in the shade of the ground electrode or the ground electrode is in the direction of the swirl of the air-fuel mixture inside the engine. Desirably, it is not present in a direction that hinders flame growth.
【００２１】しかし、スパークプラグはネジの切り始め
に対する接地電極の位置が一定せず、また、シリンダヘ
ッドはスパークプラグ装着座面に対するネジの相対的切
り始め位置が一定しないため、シリンダヘッドにスパー
クプラグを装着すると接地電極の方向は区々となる。こ
のため、エンジン内部における混合気のスワールの方向
に対し火花放電ギャップが接地電極の陰になるかあるい
は接地電極が火炎成長を妨げる方向に存在しないように
設定することは非常に困難となる。However, in the spark plug, the position of the ground electrode with respect to the start of cutting of the screw is not constant, and in the cylinder head, the position of the start of cutting of the screw relative to the mounting surface of the spark plug is not constant. Is attached, the direction of the ground electrode varies. For this reason, it is very difficult to set such that the spark discharge gap is shaded by the ground electrode with respect to the direction of the swirl of the air-fuel mixture inside the engine, or the ground electrode does not exist in the direction that hinders the flame growth.
【００２２】ネジの切り始め位置が一定しないスパーク
プラグを、本発明にかかる製造方法によってスパークプ
ラグ装着座面部におけるネジの切り始め位置を一定にし
て製作したシリンダヘッドに装着する。この時、スパー
クプラグの接地電極が混合気の燃焼を妨げる位置にある
場合は、そのスパークプラグをどの気筒に装着しても接
地電極が混合気の燃焼を妨げることになる。従って、従
来のネジの切り始め位置の一定しないシリンダヘッドで
あれば他の気筒に装着すれば混合気の燃焼を妨げないこ
とがあり得るという判断は、本発明にかかるシリンダヘ
ッドでは成り立たない。A spark plug whose screw cutting start position is not fixed is mounted on a cylinder head manufactured with the screw cutting start position fixed on the spark plug mounting seat portion by the manufacturing method according to the present invention. At this time, if the ground electrode of the spark plug is located at a position that prevents the combustion of the air-fuel mixture, the ground electrode will prevent the combustion of the air-fuel mixture regardless of which cylinder the spark plug is attached to. Therefore, the determination that the conventional cylinder head having an unfixed starting position of thread cutting may not hinder the combustion of the air-fuel mixture if mounted in another cylinder does not hold true with the cylinder head according to the present invention.
【００２３】一方、ネジの切り始め位置が一定しないス
パークプラグを、本発明にかかる製造方法によってネジ
の切り始め位置を種々変えて製作したシリンダヘッドの
うちの一種類に装着する。この時、接地電極の方向をチ
ェックしておく。このスパークプラグの接地電極が、混
合気の燃焼を妨げる位置にあるシリンダヘッドの場合に
は、チェックしておいた接地電極の方向と異なる混合気
の燃焼を妨げない位置にくるシリンダヘッドを選択すれ
ばよい。On the other hand, a spark plug whose screw cutting start position is not fixed is mounted on one of the cylinder heads manufactured by variously changing the screw cutting start position by the manufacturing method according to the present invention. At this time, check the direction of the ground electrode. In the case where the ground electrode of the spark plug is located at a position where the combustion of the air-fuel mixture is obstructed, a cylinder head which is located at a position not obstructing the combustion of the air-fuel mixture which is different from the direction of the ground electrode checked is selected. I just need.
【００２４】これによって、エンジン内部における混合
気のスワールの方向に対し火花放電ギャップを接地電極
の陰にするかあるいは火炎成長の妨げる方向に存在しな
いようなスパークプラグを選択することは容易となる。Thus, it becomes easy to select a spark plug in which the spark discharge gap is shaded by the ground electrode with respect to the direction of the swirl of the air-fuel mixture inside the engine or does not exist in a direction that hinders the flame growth.
【００２５】〔請求項３について〕スパークプラグの主
体金具にネジを螺刻した後、雌ネジを螺刻された治具に
該主体金具を螺嵌し、前記治具の所定位置に対応する主
体金具の端面に接地電極を接続する。一方、シリンダヘ
ッドにスパークプラグを装着する貫通下孔及びスパーク
プラグの装着座面を形成した後、該貫通下孔の内壁面に
おける前記装着座面から所定距離Ｘ燃焼室方向に進んだ
位置からネジを切り始めてスパークプラグ装着孔を形成
する。つぎに、該スパークプラグ装着孔に前記スパーク
プラグを装着する。[Claim 3] After screwing a screw into a metal shell of a spark plug, the metal shell is screwed into a jig into which a female screw is screwed, and a main body corresponding to a predetermined position of the jig is screwed. Connect the ground electrode to the end face of the bracket. On the other hand, after forming a through hole for mounting the spark plug on the cylinder head and a mounting surface for the spark plug, a screw is formed from a position on the inner wall surface of the through hole for a predetermined distance from the mounting seat surface in the direction of the combustion chamber. To form a spark plug mounting hole. Next, the spark plug is mounted in the spark plug mounting hole.
【００２６】スパークプラグをシリンダヘッドに装着し
た際における接地電極の方向は、前述のように、エンジ
ン内部における混合気のスワールの方向に対し火花放電
ギャップが接地電極の陰になるかあるいは接地電極が火
炎成長を妨げる方向に存在しないようにすることが望ま
しい。As described above, the direction of the ground electrode when the spark plug is mounted on the cylinder head may be such that the spark discharge gap is in the shade of the ground electrode or the ground electrode is in the direction of the swirl of the air-fuel mixture inside the engine. Desirably, it is not present in a direction that hinders flame growth.
【００２７】しかし、スパークプラグはネジの切り始め
に対する接地電極の位置が一定せず、また、シリンダヘ
ッドはスパークプラグ装着座面に対するネジの相対的切
り始め位置が一定しないため、シリンダヘッドにスパー
クプラグを装着すると接地電極の方向は区々となる。こ
のため、エンジン内部における混合気のスワールの方向
に対し火花放電ギャップが接地電極の陰になるかあるい
は接地電極が火炎成長を妨げる方向に存在しないように
設定することは非常に困難となる。However, in the spark plug, the position of the ground electrode with respect to the start of cutting the screw is not constant, and in the cylinder head, the position of the start of cutting the screw relative to the spark plug mounting seat surface is not constant. Is attached, the direction of the ground electrode varies. For this reason, it is very difficult to set such that the spark discharge gap is shaded by the ground electrode with respect to the direction of the swirl of the air-fuel mixture inside the engine, or the ground electrode does not exist in the direction that hinders flame growth.
【００２８】本発明にかかる製造方法によって製作され
た所定の位置に接地電極を有するスパークプラグを、本
発明にかかる製造方法によって製作されたスパークプラ
グ装着座面に対するネジの相対的切り始め位置が一定に
されたシリンダヘッドに装着する。スパークプラグの接
地電極の位置およびシリンダヘッドのスパークプラグ装
着孔におけるネジの切り始め位置はあらかじめ実験等に
よって定めておく。これによって、エンジン内部におけ
る混合気のスワールの方向に対し火花放電ギャップが接
地電極の陰になるかあるいは接地電極が火炎成長を妨げ
る方向に存在しないようにできる。In the spark plug having the ground electrode at a predetermined position manufactured by the manufacturing method according to the present invention, the relative cutting start position of the screw with respect to the spark plug mounting seat manufactured by the manufacturing method according to the present invention is constant. Attach to the cylinder head set in the above. The position of the ground electrode of the spark plug and the starting position of the screw in the spark plug mounting hole of the cylinder head are determined in advance by experiments and the like. This prevents the spark gap from shadowing the ground electrode with respect to the direction of the air-fuel mixture swirl inside the engine or preventing the ground electrode from being present in a direction that hinders flame growth.
【００２９】[0029]
【発明の実施の形態】本発明の一実施例（請求項１〜３
に対応）を図１〜図５に基づいて説明する。本発明の構
成を用いて製造したスパークプラグＡは、図１に示すよ
うに、先端面１０に接地電極１０１を溶接した円筒状の
主体金具１と、この主体金具１内にパッキン１４１、Ｏ
リング１４２、１４３、滑石１４４を介して固定される
軸孔２１を有する絶縁碍子２とを具備する。かかる軸孔
２１内には端子電極３のシール部３１及び先端部が碍子
先端面２２１から突出するように中心電極４の基部４１
とがシールガラス５、６によって固定されている。ま
た、シールガラス５、６間に抵抗体７を具備する。DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention (Claims 1 to 3)
Will be described based on FIGS. 1 to 5. As shown in FIG. 1, a spark plug A manufactured by using the configuration of the present invention has a cylindrical metal shell 1 having a ground electrode 101 welded to a front end face 10 thereof, and a packing 141 and an O in the metal shell 1.
Insulator 2 having shaft hole 21 fixed via rings 142 and 143 and talc 144. In the shaft hole 21, the base portion 41 of the center electrode 4 is formed such that the sealing portion 31 of the terminal electrode 3 and the tip end protrude from the insulator tip surface 221.
Are fixed by seal glasses 5 and 6. Further, a resistor 7 is provided between the seal glasses 5 and 6.
【００３０】そして、このスパークプラグＡは、図２に
示すように、ガスケット１１を介してエンジン８のシリ
ンダヘッド８１のスパークプラグ装着孔８１１に所定ト
ルクで螺着される。また、プラグキャップ（図示せず）
が端子部３２に嵌合され、高電圧を給電する。The spark plug A is screwed into the spark plug mounting hole 811 of the cylinder head 81 of the engine 8 with a predetermined torque via the gasket 11, as shown in FIG. Also, a plug cap (not shown)
Are fitted to the terminal portions 32 to supply a high voltage.
【００３１】主体金具１（低炭素鋼製）は、外周にネジ
１２１を形成したネジ部１２と、前側にガスケット１１
を配設した胴部１３と、プラグレンチを嵌合させるため
の六角部１４とからなる。The metal shell 1 (made of low carbon steel) has a screw portion 12 having a screw 121 formed on the outer periphery, and a gasket 11 on the front side.
And a hexagonal portion 14 for fitting a plug wrench.
【００３２】絶縁碍子２は、アルミナを主体とするセラ
ミック焼結体で形成され、ネジ部１２の内側に位置する
脚長部２２と、主体金具１の六角部１４から胴部１３の
内側に位置する径大部２３と、外周にコルゲーション２
４１を形成した頭部２４とからなる。また、絶縁碍子２
の軸に沿って軸孔２１が形成されている。なお、頭部２
４から径大部２３間に位置する軸孔２１の直径は径大に
形成され、脚長部２２に位置する軸孔２１の直径は中心
電極径よりやや大きく設定されている。The insulator 2 is formed of a ceramic sintered body mainly composed of alumina, and has a leg portion 22 located inside the screw portion 12 and a hexagonal portion 14 of the metal shell 1 located inside the body portion 13. Large diameter part 23 and corrugation 2 on the outer circumference
41 are formed. Insulator 2
A shaft hole 21 is formed along the axis. In addition, head 2
The diameter of the shaft hole 21 located between 4 and the large diameter portion 23 is formed to be large in diameter, and the diameter of the shaft hole 21 located in the leg long portion 22 is set slightly larger than the center electrode diameter.
【００３３】端子電極３は、母材である低炭素鋼の表面
にニッケル鍍金を施したものであり、軸孔２１内で固定
されるシール部３１と、絶縁碍子２の頭部端面２４２か
ら突出する端子部３２と、端子部３２とシール部３１と
を接続する棒状部３３とからなる。The terminal electrode 3 is formed by applying nickel plating to the surface of a low-carbon steel as a base material, and protrudes from a seal portion 31 fixed in the shaft hole 21 and a head end surface 242 of the insulator 2. And a rod-shaped part 33 connecting the terminal part 32 and the seal part 31.
【００３４】端子部３２は、嵌合状態のプラグキャップ
の抜けを防止するため、中央部を径小に形成している。
シール部３１は、外周が螺子またはローレット状に加工
され、シールガラス５により軸孔２１内に封着されてい
る。The terminal portion 32 has a small diameter at the center in order to prevent the plug cap from coming off in the fitted state.
The outer periphery of the seal portion 31 is processed into a screw or knurl shape, and is sealed in the shaft hole 21 by the seal glass 5.
【００３５】中心電極４は、ニッケル合金製の鞘材と、
該鞘材内に封入される芯材（銅等の良熱伝導性金属）と
で構成され、先端部４２を碍子先端面２２１から突出さ
せるように軸孔２１内に嵌め込まれ、軸孔２１内で基部
４１を固定されている。The center electrode 4 includes a sheath material made of a nickel alloy,
A core material (a good heat conductive metal such as copper) enclosed in the sheath material is fitted into the shaft hole 21 so that the tip portion 42 projects from the insulator tip surface 221. The base 41 is fixed by.
【００３６】シールガラス５、６は、銅粉末とガラス粉
末とを混合した導電性ガラス粉末を溶融凝固させたもの
であり、導電性を有する。そして、中心電極４と端子電
極３とはシールガラス６から抵抗体７を通じ、さらにシ
ールガラス５を介して電気接続される。The sealing glasses 5 and 6 are obtained by melting and solidifying a conductive glass powder obtained by mixing a copper powder and a glass powder, and have conductivity. The center electrode 4 and the terminal electrode 3 are electrically connected from the seal glass 6 through the resistor 7 and further through the seal glass 5.
【００３７】次に、シリンダヘッド８１のスパークプラ
グ装着孔８１１の形成方法、ネジリング８２の雌ネジ形
成方法、スパークプラグＡの製造方法（主に接地電極１
０１の溶接工程）、及びエンジン８の製造方法を図３〜
図５とともに説明する。Next, a method of forming the spark plug mounting hole 811 of the cylinder head 81, a method of forming a female screw of the screw ring 82, and a method of manufacturing the spark plug A (mainly the ground electrode 1)
01 to FIG. 3) and a method of manufacturing the engine 8 are shown in FIGS.
This will be described with reference to FIG.
【００３８】〔スパークプラグ装着孔８１１の形成方
法〕 雌ネジ未形成の貫通下孔８００及びスパークプラグ装
着座面８１２を形成したシリンダヘッド８１を作業台に
固定し、貫通下孔８００のスパークプラグ装着座面８１
２（プラグガスケット面）から所定距離Ｘだけ進んだ位
置ｐ１の内壁面にネジ切りバイト９１の刃９１１を当て
がう｛図３の（ａ）｝。 なお、本実施例では、スパークプラグＡを所定締め付け
トルクで装着した際に接地電極１０１が混合気の燃焼を
妨げない位置に対応する貫通下孔８００の円周上の個所
から軸方向に（孔長−Ｘ）であってネジピッチの整数倍
だけ退行した内壁面に刃９１１を当てがっている。[Method of Forming Spark Plug Attachment Hole 811] The through hole 800 having no female screw and the cylinder head 81 having the spark plug attachment seat surface 812 formed thereon are fixed to a worktable. Seat 81
The blade 911 of the threaded cutting tool 91 is applied to the inner wall surface at a position p1 which is advanced by a predetermined distance X from 2 (plug gasket surface) (FIG. 3A). In the present embodiment, when the spark plug A is mounted with a predetermined tightening torque, the ground electrode 101 extends axially from a location on the circumference of the through-bore hole 800 corresponding to a position at which the combustion of the air-fuel mixture is not hindered. The blade 911 is applied to the inner wall surface which is a length -X) and retreats by an integral multiple of the screw pitch.
【００３９】刃９１１を押し付けた状態でネジ切りバ
イト９１を前方に螺旋移動させ、所定ピッチの雌ネジ
を、雌ネジ未形成の貫通下孔８００の位置ｐ１より前方
（燃焼室）の内壁面に形成する｛図３の（ｂ）｝。 雌ネジ形成（位置ｐ１より前方）が完了すると、切ら
れたネジ溝を辿ってネジ切りバイト９１を位置ｐ１まで
戻し、刃９１１を押し付けた状態でネジ切りバイト９１
を後方に螺旋移動させる。続けて同じピッチの雌ネジを
位置ｐ１より後方の内壁面に形成する。While the blade 911 is pressed, the threaded cutting tool 91 is spirally moved forward, and a female screw having a predetermined pitch is formed on the inner wall surface (combustion chamber) in front of the position p1 of the through hole 800 where no female screw is formed. Forming {(b) of FIG. 3}. When the internal thread formation (forward from the position p1) is completed, the threaded cutting tool 91 is returned to the position p1 by following the cut screw groove, and the threaded cutting tool 91 is pressed with the blade 911 pressed.
Is spirally moved backward. Subsequently, female screws having the same pitch are formed on the inner wall surface behind the position p1.
【００４０】〔ネジリング８２の雌ネジ形成方法〕 刃９１１を当てがう位置に対応した前端面８２３（該
当位置）に前もって印８２０を付ける｛図４の
（ａ）｝。[Method of Forming Female Thread of Screw Ring 82] A mark 820 is attached in advance to the front end face 823 (the corresponding position) corresponding to the position where the blade 911 is to be applied (FIG. 4A).
【００４１】貫通下孔８００と同じ長さの軸孔８２１
を有するネジリング８２を作業台に固定する。次に後端
面８２２から所定距離ｘだけ進んだ位置ｐ２であって、
雌ネジ未形成の軸孔８２１の内壁面｛印８２０を付けた
位置から軸方向に、（孔長−Ｘ）であってネジピッチの
整数倍だけ退行した位置｝にネジ切りバイト９１の刃９
１１を当てがう。A shaft hole 821 having the same length as the through hole 800
Is fixed to the worktable. Next, at a position p2 advanced by a predetermined distance x from the rear end face 822,
The inner wall surface of the shaft hole 821 where no female screw is formed (in the axial direction from the position where the mark 820 is attached) is (hole length−X) at a position regressed by an integral multiple of the screw pitch}.
Apply 11
【００４２】刃９１１を押し付けた状態でネジ切りバ
イト９１を前方に螺旋移動させ、所定ピッチの雌ネジ
を、雌ネジ未形成の軸孔８２１の位置ｐ２より前方の内
壁面に形成する｛図４の（ｂ）｝。While the blade 911 is pressed, the threaded cutting tool 91 is spirally moved forward to form a female screw of a predetermined pitch on the inner wall surface ahead of the position p2 of the shaft hole 821 where no female screw is formed {FIG. (B)｝.
【００４３】雌ネジ形成（位置ｐ２より前方）が完了
すると、切られたネジ溝を辿ってネジ切りバイト９１を
位置ｐ２まで戻し、刃９１１を押し付けた状態でネジ切
りバイト９１を後方に螺旋移動させる。続けて同じピッ
チの雌ネジを位置ｐ２より後方の内壁面に形成する。When the formation of the female thread (forward from the position p2) is completed, the threaded cutting tool 91 is returned to the position p2 by following the cut screw groove, and the screw cutting tool 91 is spirally moved backward while the blade 911 is pressed. Let it. Subsequently, female screws having the same pitch are formed on the inner wall surface behind the position p2.
【００４４】〔スパークプラグＡの製造方法〕 主体金具１の先端部の外周にネジ１２１を螺刻する
｛図５の（ａ）｝。 雌ネジの形成が完了したネジリング８２の後端面８２
２側に、ネジ１２１を螺刻した主体金具１を主体金具１
の先端面１０側から螺着する。[Method of Manufacturing Spark Plug A] A screw 121 is threaded on the outer periphery of the tip of the metal shell 1 (FIG. 5A). The rear end face 82 of the screw ring 82 in which the formation of the female screw is completed
On the second side, the metal shell 1 obtained by threading the screw 121 is inserted into the metal shell 1
From the tip end surface 10 side.
【００４５】前端面８２３に付いた印８２０に臨む、
主体金具１の先端面１０に接地電極１０１となる電極棒
１０２を溶接｛図５の（ｃ）｝する。 ネジリング８２を主体金具１から外す。 電極棒１０２を略Ｊ字状に曲げる。 中心電極４及び端子電極３をシールガラスにより軸孔
２１内に固定した絶縁碍子２を主体金具１内に嵌め込
み、加締部１４５を加締める。さらにガスケット１１を
装着することによってスパークプラグＡが完成する。Facing the mark 820 attached to the front end face 823,
An electrode rod 102 serving as a ground electrode 101 is welded to the distal end face 10 of the metal shell 1 (FIG. 5C). Remove the screw ring 82 from the metal shell 1. The electrode rod 102 is bent into a substantially J shape. The insulator 2 in which the center electrode 4 and the terminal electrode 3 are fixed in the shaft hole 21 with seal glass is fitted into the metal shell 1 and the caulking portion 145 is caulked. Further, by mounting the gasket 11, the spark plug A is completed.
【００４６】〔エンジン８の製造方法〕 上述したスパークプラグ装着孔８１１の形成方法によ
って製造したシリンダヘッド８１を、予めピストン等を
装着したシリンダブロック（図示せず）にボルト締めす
る。[Method of Manufacturing Engine 8] The cylinder head 81 manufactured by the above-described method of forming the spark plug mounting hole 811 is bolted to a cylinder block (not shown) in which a piston or the like is mounted in advance.
【００４７】上述のスパークプラグＡの製造方法によ
って製造したスパークプラグＡを該シリンダヘッド８１
のスパークプラグ装着孔８１１に螺着し、さらに種々の
電装品等（図示せず）を装着してエンジン８が完成す
る。The spark plug A manufactured by the above-described method for manufacturing the spark plug A is connected to the cylinder head 81.
The engine 8 is completed by screwing into the spark plug mounting hole 811 and mounting various electric components and the like (not shown).
【００４８】本実施例ではネジリング８２の前端面８２
３に印を付けた後に雌ネジの形成を行ったが、雌ネジ形
成済みのネジリングに基準となるスパークプラグを螺着
して該当する位置に印を付けても良い。即ち、上述した
シリンダヘッド８１に所定トルクで締め付けた場合に混
合気の燃焼を妨げないスパークプラグＡを雌ネジ形成済
みのネジリングに螺着し、当該スパークプラグＡの接地
電極の位置に対応するネジリング上の前端面８２３に印
を付けても良い。In this embodiment, the front end surface 82 of the screw ring 82
Although the female screw was formed after marking 3, the reference position may be marked by screwing a reference spark plug to the screw ring on which the female screw has been formed. That is, a spark plug A which does not hinder the combustion of the air-fuel mixture when tightened to the above-described cylinder head 81 with a predetermined torque is screwed to a screw ring having a female screw formed therein, and a screw ring corresponding to the position of the ground electrode of the spark plug A The upper front end face 823 may be marked.
【００４９】なお、この場合、スパークプラグＡに装着
したガスケット１１は、シリンダヘッド８１からスパー
クプラグＡを外した際にバックラッシュによって変形が
若干戻る。従って、ネジリングにスパークプラグを締め
付けるトルクは予め実験等によって当初から所定トルク
でネジリングを締め付けたときと同じ位置に接地電極が
来るように調整しておく必要がある。In this case, when the spark plug A is removed from the cylinder head 81, the gasket 11 attached to the spark plug A slightly deforms due to backlash. Therefore, the torque for tightening the spark plug to the screw ring must be adjusted in advance by experiments or the like so that the ground electrode is located at the same position as when the screw ring was tightened with the predetermined torque from the beginning.
【００５０】つぎに、本実施例の効果を述べる。スパー
クプラグ装着孔８１１の後端面８２２から所定距離ｘだ
け進んだ位置ｐ２の、雌ネジ未形成の軸孔８２１の内壁
面｛印８２０を付けた位置から軸方向に、（孔長−Ｘ）
だけ退行した位置｝から、シリンダヘッド８１に雌ネジ
を形成し、且つ、雌ネジ未形成の軸孔８２１の、位置ｐ
２からネジリング８２に雌ネジを形成する構成であるの
で、各雌ネジ（シリンダヘッド８１、ネジリング８２）
の螺刻状態を略同一にすることができる。Next, the effect of this embodiment will be described. (Position -X) in the axial direction from the position at which the inner wall surface ８ mark 820 of the shaft hole 821 where the female screw is not formed at the position p2 advanced by the predetermined distance x from the rear end surface 822 of the spark plug mounting hole 811.
A female screw is formed in the cylinder head 81 from the position し た retreated only by
Since a female screw is formed on the screw ring 82 from Step 2, each female screw (cylinder head 81, screw ring 82)
Can be made substantially the same.
【００５１】このため、前端面８２３に付いた印８２０
に臨む主体金具１の先端面１０に接地電極１０１となる
電極棒１０２を溶接すれば、完成したスパークプラグＡ
をシリンダヘッド８１のスパークプラグ装着孔８１１に
所定トルクで螺着した際に、スパークプラグＡの接地電
極１０１を自動的に所定位置に臨ますことができる。For this reason, the mark 820 attached to the front end face 823
When the electrode rod 102 serving as the ground electrode 101 is welded to the front end face 10 of the metal shell 1 facing the
Is screwed into the spark plug mounting hole 811 of the cylinder head 81 with a predetermined torque, the ground electrode 101 of the spark plug A can automatically reach a predetermined position.
【００５２】このため、スワール方向に対して、接地電
極１０１の先端面を最適な方向に向けることができるの
で、エンジン性能を十分に引き出すことができる。ま
た、スパークプラグの締め付けトルク（締め付け回転
角）を調整して接地電極１０１の位置を合わせる構成で
ないので、作業に手間がかからない。さらに、スパーク
プラグ発火部の突き出し位置を一定にすることができる
ため、突き出し位置に起因する着火性に影響を及ぼさ
ず、試験時においても評価を正しく行うことができる。Therefore, the tip surface of the ground electrode 101 can be directed in the optimum direction with respect to the swirl direction, so that the engine performance can be sufficiently brought out. Further, since the configuration is not such that the position of the ground electrode 101 is adjusted by adjusting the tightening torque (tightening rotation angle) of the spark plug, the work is not troublesome. Furthermore, since the protruding position of the spark plug firing portion can be made constant, the evaluation can be correctly performed even during the test without affecting the ignitability caused by the protruding position.
【図１】本発明の構成を用いて製造したスパークプラグ
の断面図である。FIG. 1 is a cross-sectional view of a spark plug manufactured using the configuration of the present invention.
【図２】そのスパークプラグをエンジンに装着した時の
断面図である。FIG. 2 is a sectional view when the spark plug is mounted on an engine.
【図３】エンジンヘッドにプラグ装着孔を形成する方法
を示す工程図である。FIG. 3 is a process diagram showing a method of forming a plug mounting hole in an engine head.
【図４】ネジリングに雌ネジを形成する方法を示す説明
図である。FIG. 4 is an explanatory view showing a method of forming a female screw on a screw ring.
【図５】主体金具に接地電極となる電極棒を溶接する方
法を示す工程図である。FIG. 5 is a process chart showing a method of welding an electrode rod serving as a ground electrode to a metal shell.
【図６】従来技術において、主体金具に接地電極となる
電極棒を溶接する方法を示す工程図である。FIG. 6 is a process diagram showing a method of welding an electrode rod serving as a ground electrode to a metal shell in a conventional technique.
１ 主体金具 ８ エンジン ８１ シリンダヘッド ８２ ネジリング １０１ 接地電極 １２１ ネジ ８００ 貫通下孔 ８１１ スパークプラグ装着孔 ８１２ スパークプラグ装着座面 Ａ スパークプラグ DESCRIPTION OF SYMBOLS 1 Metal shell 8 Engine 81 Cylinder head 82 Screw ring 101 Ground electrode 121 Screw 800 Penetration lower hole 811 Spark plug mounting hole 812 Spark plug mounting seat surface A Spark plug
フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｈ０１Ｔ 13/20 Ｈ０１Ｔ 13/20 Ｅ 21/02 21/02 Continued on the front page (51) Int.Cl. 6 Identification code FI H01T 13/20 H01T 13/20 E 21/02 21/02
Claims (3)
螺刻された治具に該主体金具を螺着し、前記治具の所定
位置に対応する主体金具の端面に接地電極を接続するこ
とによってネジ首部におけるネジの切り始め位置に対す
る接地電極の相対位置を一定にすることを特徴とするス
パークプラグの製造方法。After screwing a screw on a metal shell, the metal shell is screwed on a jig threaded with a female screw, and a ground electrode is attached to an end face of the metal shell corresponding to a predetermined position of the jig. A method for manufacturing a spark plug, characterized in that, by connecting, a relative position of a ground electrode with respect to a screw cutting start position at a screw neck is fixed.
孔及びスパークプラグ装着座面を形成した後、該貫通下
孔の内壁面における前記装着座面から所定距離Ｘ燃焼室
方向に進んだ位置からネジを切り始めてスパークプラグ
装着孔を形成することによってスパークプラグ装着座面
に対するネジの相対的切り始め位置を一定にすることを
特徴とするシリンダヘッドの製造方法。2. A through hole and a spark plug mounting seat surface are formed at a position where a spark plug is mounted, and then a predetermined distance from the mounting surface on the inner wall surface of the through hole in the direction of the combustion chamber. A method for manufacturing a cylinder head, comprising: forming a spark plug mounting hole by starting to cut a screw so as to make a relative starting position of the screw relative to a spark plug mounting seat surface constant.
した後、雌ネジを螺刻された治具に該主体金具を螺着
し、前記治具の所定位置に対応する主体金具の端面に接
地電極を接続してスパークプラグを製造するとともに、
シリンダヘッドのスパークプラグを装着する位置に貫通
下孔及びスパークプラグ装着座面を形成した後、該貫通
下孔の内壁面における前記装着座面から所定距離Ｘ燃焼
室方向に進んだ位置からネジを切り始めてスパークプラ
グ装着孔を形成してシリンダヘッドを製造し、該スパー
クプラグ装着孔に前記スパークプラグを装着することに
よって、スパークプラグをシリンダヘッドに所定トルク
によって装着した際における接地電極の方向を、エンジ
ン内部における混合気のスワールの方向に対し、火花放
電ギャップが接地電極の陰になるかあるいは接地電極が
火炎成長を妨げる方向に存在しないようにすることを特
徴とするエンジンの製造方法。3. A screw is screwed into a metal shell of a spark plug, and then the metal shell is screwed to a jig having a female screw threaded thereon, and the metal shell is attached to an end face of the metal shell corresponding to a predetermined position of the jig. Connect the ground electrode to manufacture the spark plug,
After forming a through hole and a spark plug mounting seat surface at the position where the spark plug of the cylinder head is mounted, a screw is inserted from a position which has advanced in the direction of the combustion chamber a predetermined distance from the mounting seat surface on the inner wall surface of the through hole. Start cutting to form a spark plug mounting hole to produce a cylinder head, by mounting the spark plug in the spark plug mounting hole, the direction of the ground electrode when the spark plug is mounted to the cylinder head with a predetermined torque, A method for manufacturing an engine, wherein a spark discharge gap is shaded by a ground electrode with respect to a direction of a swirl of an air-fuel mixture inside an engine, or the ground electrode does not exist in a direction that hinders flame growth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16865997A JP3260661B2 (en) | 1997-06-25 | 1997-06-25 | Spark plug manufacturing method, cylinder head manufacturing method, and engine manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16865997A JP3260661B2 (en) | 1997-06-25 | 1997-06-25 | Spark plug manufacturing method, cylinder head manufacturing method, and engine manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1113613A true JPH1113613A (en) | 1999-01-19 |
| JP3260661B2 JP3260661B2 (en) | 2002-02-25 |
Family
ID=15872129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16865997A Expired - Fee Related JP3260661B2 (en) | 1997-06-25 | 1997-06-25 | Spark plug manufacturing method, cylinder head manufacturing method, and engine manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3260661B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001187966A (en) * | 1999-12-28 | 2001-07-10 | Ngk Spark Plug Co Ltd | Threaded member having gasket |
| US6489709B1 (en) | 1999-03-19 | 2002-12-03 | Ngk Spark Plug Co., Ltd. | Captive spark plug gasket |
| JP2010021144A (en) * | 2008-07-14 | 2010-01-28 | Robert Bosch Gmbh | Spark plug |
| US8866369B2 (en) | 2011-01-13 | 2014-10-21 | Federal-Mogul Ignition Company | Spark plug having improved ground electrode orientation and method of forming |
-
1997
- 1997-06-25 JP JP16865997A patent/JP3260661B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6489709B1 (en) | 1999-03-19 | 2002-12-03 | Ngk Spark Plug Co., Ltd. | Captive spark plug gasket |
| JP2001187966A (en) * | 1999-12-28 | 2001-07-10 | Ngk Spark Plug Co Ltd | Threaded member having gasket |
| JP2010021144A (en) * | 2008-07-14 | 2010-01-28 | Robert Bosch Gmbh | Spark plug |
| US8866369B2 (en) | 2011-01-13 | 2014-10-21 | Federal-Mogul Ignition Company | Spark plug having improved ground electrode orientation and method of forming |
| US9236713B2 (en) | 2011-01-13 | 2016-01-12 | Federal-Mogul Corporation | Spark plug having improved ground electrode orientation and method of forming |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3260661B2 (en) | 2002-02-25 |
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