JP4938341B2

JP4938341B2 - Plug socket for internal combustion engine

Info

Publication number: JP4938341B2
Application number: JP2006104052A
Authority: JP
Inventors: 玲高田; 雅晶堀
Original assignee: 阪神エレクトリック株式会社
Priority date: 2006-04-05
Filing date: 2006-04-05
Publication date: 2012-05-23
Anticipated expiration: 2026-04-05
Also published as: JP2007278140A

Description

この発明は、自動車のエンジンなどの内燃機関の点火プラグに火花放電を発生させるため、エンジンに取り付けられた内燃機関用点火コイルの、エンジンのプラグホール内へ浅く突入する高圧筒内の高圧端子からの高電圧を、エンジンのプラグホールの底に取り付けられた点火プラグの頂部電極へ供給する内燃機関用プラグソケットに関するものである。 In order to generate a spark discharge in an ignition plug of an internal combustion engine such as an automobile engine, the present invention is based on a high-pressure terminal in a high-pressure cylinder of an ignition coil for an internal combustion engine attached to the engine that rushes into a plug hole of the engine. This is related to a plug socket for an internal combustion engine that supplies a high voltage to the top electrode of a spark plug attached to the bottom of the plug hole of the engine.

図６は従来の内燃機関用プラグソケットを用いた内燃機関用点火コイル装置をエンジンに取り付けた状態の概略構成を示す部分断面図である。 FIG. 6 is a partial cross-sectional view showing a schematic configuration in a state where an ignition coil device for an internal combustion engine using a conventional plug socket for an internal combustion engine is attached to the engine.

図６において、内燃機関用点火コイル装置１１は、エンジン６１に取り付けられる内燃機関用点火コイル２１と、この内燃機関用点火コイル２１の高圧筒２２ｔに取り付けられ、エンジン６１に設けられたプラグホール６２の底に取り付けられた点火プラグ７１の頂部電極７２に、内燃機関用点火コイル２１の高圧端子２４からの高電圧を供給する内燃機関用プラグソケット４１とで構成されている。 In FIG. 6, the internal combustion engine ignition coil device 11 includes an internal combustion engine ignition coil 21 attached to the engine 61 and a plug hole 62 provided in the engine 61 and attached to the high-pressure cylinder 22 t of the internal combustion engine ignition coil 21. The internal combustion engine plug socket 41 supplies a high voltage from the high voltage terminal 24 of the internal combustion engine ignition coil 21 to the top electrode 72 of the ignition plug 71 attached to the bottom of the internal combustion engine.

上記した内燃機関用点火コイル２１は、絶縁ケース２２と、この絶縁ケース２２の側面部分に一体的に設けられたソケット部２２ｓに設けられている複数の低圧端子（一次端子、図示省略）と、絶縁ケース２２の下端部分に一体的に設けられた、高圧タワー部とも称される高圧筒２１ｔ内に圧入された高圧端子（二次端子）２４と、絶縁ケース２２内に収容されたコイル・鉄心組立体（図示省略）と、絶縁ケース２２内に充填され、各部品相互の高電圧絶縁を行うとともに、各部品を絶縁ケース２２内に固定する絶縁樹脂としての熱硬化性樹脂とで構成されている。
そして、内燃機関用点火コイル２１は、絶縁ケース２２の側面部分に一体的に設けられた取付フランジ部２２ｆを取付ねじ３４によってエンジン６１の取付部６３に取り付けることにより、エンジン６１のプラグホール６２内へ高圧筒２２ｔが浅く突入するように取り付けられる。
なお、複数の低圧端子は、例えば、絶縁ケース２２の成形時にインサートされる。 The internal combustion engine ignition coil 21 includes an insulating case 22 and a plurality of low-voltage terminals (primary terminals, not shown) provided in a socket portion 22 s integrally provided on a side surface portion of the insulating case 22. A high-voltage terminal (secondary terminal) 24 press-fitted into a high-pressure cylinder 21t, also referred to as a high-voltage tower portion, provided integrally with the lower end portion of the insulating case 22, and a coil / iron core accommodated in the insulating case 22 The assembly (not shown) is filled with an insulating case 22 and is composed of a thermosetting resin as an insulating resin for fixing each component in the insulating case 22 while performing high-voltage insulation between the components. Yes.
The internal combustion engine ignition coil 21 is attached to the mounting portion 63 of the engine 61 by means of a mounting screw 34 with a mounting flange portion 22f provided integrally with the side surface portion of the insulating case 22 so that the inside of the plug hole 62 of the engine 61 The high-pressure cylinder 22t is attached so as to enter the shallow.
The plurality of low-voltage terminals are inserted, for example, when the insulating case 22 is molded.

上記したコイル・鉄心組立体は、一次コイルボビンと、この一次コイルボビンの外周に巻線を巻き付け、積層して形成された一次コイルと、この一次コイルの外周に配置された二次コイルボビンと、この二次コイルボビンの外周に巻線を巻き付け、積層して形成された二次コイルと、閉磁路で一次コイルと二次コイルとを磁気的に結合する鉄心とで構成されている。
そして、複数の低圧端子、一次コイルの両端、二次コイルの一端は所定の回路を構成するように接続され、二次コイルの他端は、二次コイルボビンの端部に取り付けられた端末ピンを介して高圧端子２４に接続されている。 The coil / iron core assembly described above includes a primary coil bobbin, a primary coil formed by winding a winding around the outer periphery of the primary coil bobbin, a secondary coil bobbin disposed on the outer periphery of the primary coil, and the secondary coil bobbin. A secondary coil is formed by winding a winding around the outer periphery of the secondary coil bobbin and laminating it, and an iron core that magnetically couples the primary coil and the secondary coil with a closed magnetic circuit.
A plurality of low-voltage terminals, both ends of the primary coil, and one end of the secondary coil are connected to form a predetermined circuit, and the other end of the secondary coil is connected to a terminal pin attached to the end of the secondary coil bobbin. To the high voltage terminal 24.

上記した内燃機関用プラグソケット４１は、内燃機関用点火コイル２１の、エンジン６１のプラグホール６２内へ浅く突入する高圧筒２２ｔに被さり、内燃機関用点火コイル２１から供給される高電圧を絶縁シールするとともに、エンジン６１のプラグホール６２内への液体の浸入を防ぐ、ラバー部とも称される弾性体製の高圧筒嵌合部４２と、プラグホール６２の底に取り付けられた点火プラグ７１の、頂部電極を７２有する絶縁碍子７４に被さって絶縁シールする、ブーツ部とも称される弾性体製のプラグ嵌合部４３と、このプラグ嵌合部４３と高圧筒嵌合部４２とを連結する、例えば、ポリブチレンテレフタレート（ＰＢＴ）製の絶縁パイプ４４と、この絶縁パイプ４４内に収容された導電体アッセンブリ４５とで構成されている。
そして、高圧筒２２ｔと高圧筒嵌合部４２、絶縁パイプ４４と高圧筒嵌合部４２およびプラグ嵌合部４３とは、例えば、周回する突条と、この突条が嵌合する嵌合溝とによって結合されている。
また、絶縁パイプ４４には、下端から少し上側の内側に係止段部４４ｓを形成するため、周回する肉盛り部４４ｐが設けられている。 The internal combustion engine plug socket 41 covers the high voltage cylinder 22t of the internal combustion engine ignition coil 21 that enters the plug hole 62 of the engine 61 shallowly, and insulates the high voltage supplied from the internal combustion engine ignition coil 21. In addition, the high pressure cylinder fitting portion 42 made of an elastic body, also called a rubber portion, which prevents liquid from entering the plug hole 62 of the engine 61, and the spark plug 71 attached to the bottom of the plug hole 62, A plug fitting portion 43 made of an elastic body, which is also called a boot portion, covers and covers an insulator 74 having a top electrode 72, and connects the plug fitting portion 43 and the high-pressure cylinder fitting portion 42. For example, the insulating pipe 44 made of polybutylene terephthalate (PBT) and a conductor assembly 45 accommodated in the insulating pipe 44 are configured.
The high-pressure cylinder 22t and the high-pressure cylinder fitting portion 42, the insulating pipe 44, the high-pressure cylinder fitting portion 42, and the plug fitting portion 43 include, for example, a rotating ridge and a fitting groove into which the ridge is fitted. And is bound by.
In addition, the insulating pipe 44 is provided with a built-up portion 44p that circulates in order to form a locking step 44s slightly inside from the lower end.

上記した導電体アッセンブリ４５は、絶縁ケース２２の高圧筒２２ｔ内の高圧端子２４に一端（上端）が接続される、例えば、コイルスプリングで構成された第１導電材４６と、この第１導電材４６の他端（下端）に取り付けて接続された第１キャップ４７と、この第１キャップ４７に一端（上端）側を保持される抵抗体４８と、この抵抗体４８の他端（下端）側を保持する第２キャップ４９と、この第２キャップ４９に一端（上端）を取り付けて接続され、他端（下端）が点火プラグ７１の頂部電極７２に接続される、例えば、コイルスプリングで構成された第２導電材５０とで構成されている。
そして、第１キャップ４７（第２キャップ４９）には、抵抗体４８の端を保持する複数の保持爪４７ｈ（保持爪４９ｈ）が設けられている。
また、第２導電材５０には、絶縁パイプ４４の係止段部４４ｓに下端が当接し、絶縁パイプ４４の係止段部４４ｓよりも上側の内径が外径とされた太径部５０ｂが設けられている。 One end (upper end) of the conductor assembly 45 is connected to the high-voltage terminal 24 in the high-pressure cylinder 22t of the insulating case 22, for example, a first conductive material 46 formed of a coil spring, and the first conductive material. A first cap 47 attached to and connected to the other end (lower end) of 46, a resistor 48 held at one end (upper end) by the first cap 47, and the other end (lower end) side of the resistor 48 The second cap 49 is connected to one end (upper end) of the second cap 49, and the other end (lower end) is connected to the top electrode 72 of the spark plug 71. And the second conductive material 50.
The first cap 47 (second cap 49) is provided with a plurality of holding claws 47h (holding claws 49h) that hold the ends of the resistors 48.
Further, the second conductive material 50 has a large-diameter portion 50b whose lower end is in contact with the engaging step 44s of the insulating pipe 44 and whose inner diameter is higher than the engaging step 44s of the insulating pipe 44. Is provided.

上記したエンジン６１には、内燃機関用点火コイル２１の高圧筒２２ｔ、および、この高圧筒２２ｔに接続された内燃機関用プラグソケット４１が挿入されるプラグホール６２と、このプラグホール６２の周囲に位置し、内燃機関用点火コイル２１の取付フランジ部２２ｆを取り付けるための取付部６３とが設けられている。
そして、プラグホール６２の底には、点火プラグ７１の雄ねじ部７５ｓを螺合させて点火プラグ７１を取り付けるための取付ねじ孔６２ｓが設けられている。 In the engine 61 described above, a high-pressure cylinder 22t of the ignition coil 21 for the internal combustion engine, a plug hole 62 into which the plug socket 41 for the internal combustion engine connected to the high-pressure cylinder 22t is inserted, and around the plug hole 62 An attachment portion 63 for attaching the attachment flange portion 22f of the ignition coil 21 for the internal combustion engine is provided.
At the bottom of the plug hole 62, an attachment screw hole 62s for attaching the ignition plug 71 by screwing the male screw portion 75s of the ignition plug 71 is provided.

上記した点火プラグ７１は、高電圧が供給される頂部端子７２と、この頂部端子７２から延びた中心電極７３と、この中心電極７３および頂部端子７２を絶縁シールする絶縁碍子７４と、この絶縁碍子７４の外側に設けられた金具７５とで構成されている。
そして、金具７５には、プラグホール６２の取付ねじ孔６２ｓに螺合する雄ねじ部７５ｓと、この雄ねじ部７５ｓから延び、中心電極７３と火花間隙をおいて対向する電極７５ｅとが設けられている。 The spark plug 71 includes a top terminal 72 to which a high voltage is supplied, a center electrode 73 extending from the top terminal 72, an insulator 74 for insulatingly sealing the center electrode 73 and the top terminal 72, and the insulator 74 and a metal fitting 75 provided outside 74.
The metal fitting 75 is provided with a male screw portion 75s screwed into the mounting screw hole 62s of the plug hole 62, and an electrode 75e extending from the male screw portion 75s and facing the center electrode 73 with a spark gap. .

この内燃機関用点火コイル装置１１はエンジン・コントロール・ユニット（ＥＣＵ）から供給される信号に基づいて内燃機関用点火コイル２１の一次コイルに通電し、一次コイルへの通電を遮断することにより、鉄心に磁束が発生し、変化することによって二次コイルに高電圧が誘起され（発生し）、高圧端子２４に高電圧が供給される。
そして、高圧端子２４に供給された高電圧は導電体アッセンブリ４５を介して点火プラグ７１の頂部電極７２に供給されるので、中心電極７３と電極７５ｅとの間に火花放電が発生する（例えば、特許文献１、特許文献２参照。）。 The internal combustion engine ignition coil device 11 energizes the primary coil of the internal combustion engine ignition coil 21 on the basis of a signal supplied from an engine control unit (ECU) and cuts off the energization of the primary coil, thereby making the iron core When a magnetic flux is generated and changed, a high voltage is induced (generated) in the secondary coil, and the high voltage is supplied to the high voltage terminal 24.
Since the high voltage supplied to the high voltage terminal 24 is supplied to the top electrode 72 of the spark plug 71 via the conductor assembly 45, a spark discharge is generated between the center electrode 73 and the electrode 75e (for example, (See Patent Document 1 and Patent Document 2.)

特開２００４−１６９６１９号公報JP 2004-169619 A 特開２００４−２２４８１号公報JP 2004-22481 A

従来の内燃機関用プラグソケット４１を実装すると、導電体アッセンブリ４５は、絶縁パイプ４４の軸方向の両側を高圧端子２４と、頂部電極７２（または係止段部４４ｓ）とによって固定されるので、絶縁パイプ４４の軸方向へ移動しなくなる。
しかしながら、第１、第２キャップ４７，４９の外径が絶縁パイプ４４の係止段部４４ｓ（肉盛り部４４ｐ）よりも上側の内径よりも小さく、第１、第２キャップ４７，４９と絶縁パイプ４４の内周面との間に大きな隙間があるので、振動によって第１、第２キャップ４７，４９および抵抗体４８が絶縁パイプ４４の軸方向と直交する方向へ移動する。
このように第１、第２キャップ４７，４９および抵抗体４８が移動すると、第１、第２キャップ４７，４９の保持爪４７ｈ，４９ｈが絶縁パイプ４４の内周面に大きな衝撃で衝突することによって絶縁パイプ４４の内周面を削り取り、絶縁パイプ４４の肉厚が薄くなって絶縁パイプ４４は要求される耐電圧を確保できなくなる。
そして、絶縁パイプ４４が要求される耐電圧を確保できなくなると、プラグホール６２内に高電圧リークが発生し、内燃機関が機能しなくなる。 When the conventional plug socket 41 for the internal combustion engine is mounted, the conductor assembly 45 is fixed on both sides in the axial direction of the insulating pipe 44 by the high voltage terminal 24 and the top electrode 72 (or the locking step portion 44s). The insulating pipe 44 does not move in the axial direction.
However, the outer diameters of the first and second caps 47 and 49 are smaller than the inner diameter on the upper side of the locking step 44s (the built-up portion 44p) of the insulating pipe 44, and are insulated from the first and second caps 47 and 49. Since there is a large gap between the inner peripheral surface of the pipe 44, the first and second caps 47 and 49 and the resistor 48 are moved in a direction perpendicular to the axial direction of the insulating pipe 44 by vibration.
When the first and second caps 47 and 49 and the resistor 48 move in this way, the holding claws 47h and 49h of the first and second caps 47 and 49 collide with the inner peripheral surface of the insulating pipe 44 with a large impact. As a result, the inner peripheral surface of the insulating pipe 44 is scraped off, and the thickness of the insulating pipe 44 becomes thin, and the insulating pipe 44 cannot secure the required withstand voltage.
When the withstand voltage required for the insulating pipe 44 cannot be ensured, a high voltage leak occurs in the plug hole 62 and the internal combustion engine does not function.

この発明は、上記したような不都合を解消するためになされたもので、絶縁パイプの内周面が削り取られるのを防止することにより、絶縁パイプの要求される耐電圧を確保することのできる内燃機関用プラグソケットを提供するものである。 The present invention has been made in order to eliminate the above-described disadvantages, and an internal combustion engine capable of ensuring the required withstand voltage of the insulating pipe by preventing the inner peripheral surface of the insulating pipe from being scraped off. An engine plug socket is provided.

この発明は、以下のような発明である。
（１）エンジンに取り付けられた内燃機関用点火コイルの、前記エンジンのプラグホール内へ浅く突入する高圧筒に被さる高圧筒嵌合部と、前記プラグホールの底に取り付けられた点火プラグの、頂部電極を有する絶縁碍子に被さるプラグ嵌合部と、このプラグ嵌合部と前記高圧筒嵌合部とを連結する絶縁パイプとを備え、この絶縁パイプ内に、前記高圧筒内の高圧端子に一端が接続される第１導電材と、この第１導電材の他端に接続された第１キャップと、この第１キャップに一端側を保持される抵抗体と、この抵抗体の他端側を保持する第２キャップと、この第２キャップに一端が接続され、他端が前記頂部電極に接続される第２導電材とが設けられ、前記高圧筒内の前記高圧端子からの高電圧を前記点火プラグの前記頂部電極へ供給する内燃機関用プラグソケットにおいて、前記第１キャップおよび前記第２キャップはそれぞれ、平板で円形の基板部と、この基板部の中心を中心とし、前記基板部の一方の面から膨出させられて、前記第１，第２導電材へそれぞれ圧入される接続取付部と、前記基板部の周縁から前記接続取付部と反対側で周方向へ、自身の弾性で前記抵抗体の端を保持できるように側面視Ｓ字状に折り曲げられ、前記基板部から離れる方向へ先端が拡開して起立するとともに、前記基板部の中心を中心とした同心円の保持爪円を外側が形成する複数の保持爪と、前記基板部の周縁から前記接続取付部と反対側で周方向へ折り曲げられて保持爪よりも高く起立し、前記基板部の中心を中心として前記保持爪円よりも大きく、前記絶縁パイプの内径に対して０．０１ｍｍ〜０．２ｍｍ小さな保護爪円を外側面が形成する複数の保護爪とからなり、前記保護爪は、前記絶縁パイプの内周面に全体で当接するため周方向のエッジによって前記絶縁パイプの内周面を削り取るものではなく、前記保護爪円は、前記保持爪に前記抵抗体の端を保持させたときの前記保持爪円よりも大きな状態を維持することを特徴とする。
（２）（１）に記載の内燃機関用プラグソケットにおいて、前記複数の保護爪の外側が円筒面の一部をそれぞれ形成することを特徴とする。
（３）（１）または（２）に記載の内燃機関用プラグソケットにおいて、前記保持爪と前記保護爪とを、円周方向へ交互に設けたことを特徴とする。
（４）（３）に記載の内燃機関用プラグソケットにおいて、前記保持爪と前記保護爪とを、３つずつにしたことを特徴とする。
（５）（１）から（４）のいずれか１つに記載の内燃機関用プラグソケットにおいて、前記複数の保護爪の先端外周を、曲面にしたことを特徴とする。 The present invention is as follows.
(1) An ignition coil for an internal combustion engine attached to an engine, a high-pressure cylinder fitting portion that covers a high-pressure cylinder that enters a plug hole of the engine shallowly, and a top portion of an ignition plug that is attached to the bottom of the plug hole A plug fitting portion that covers an insulator having an electrode; and an insulating pipe that connects the plug fitting portion and the high-pressure cylinder fitting section. One end of the high-pressure terminal in the high-pressure cylinder is provided in the insulating pipe. A first cap connected to the other end of the first conductive member, a resistor having one end held by the first cap, and the other end of the resistor A second cap to be held, and a second conductive material having one end connected to the second cap and the other end connected to the top electrode, and a high voltage from the high voltage terminal in the high voltage cylinder Supply to the top electrode of the spark plug In the plug socket for an internal combustion engine, each of the first cap and the second cap is a flat and circular substrate portion, and is bulged from one surface of the substrate portion with the center of the substrate portion as a center, The connection attachment part press-fitted into the first and second conductive materials, and the edge of the resistor can be held by its own elasticity in the circumferential direction on the opposite side of the connection attachment part from the periphery of the substrate part. A plurality of holding claws that are bent in an S-shape when viewed from the side, stand up with their tips widened away in a direction away from the substrate portion, and have concentric holding claw circles centered on the center of the substrate portion formed on the outside; , Bent from the periphery of the substrate portion in the circumferential direction on the opposite side of the connection mounting portion, and raised higher than the holding claw, and larger than the holding claw circle around the center of the substrate portion, and the inner diameter of the insulating pipe 0. 1mm~0.2mm becomes small protection claw circle and a plurality of protective nail the outer surface to form the protective nail, the insulation pipe by a circumferential edge to abut across the inner circumferential surface of the insulating pipe An inner peripheral surface is not scraped off, and the protective claw circle is maintained in a larger state than the holding claw circle when the holding claw holds the end of the resistor.
(2) In the plug socket for an internal combustion engine according to (1), the outer sides of the plurality of protective claws each form a part of a cylindrical surface.
(3) The plug socket for an internal combustion engine according to (1) or (2), wherein the holding claws and the protective claws are alternately provided in a circumferential direction.
(4) The plug socket for an internal combustion engine according to (3), wherein the holding claws and the protective claws are provided in three each.
(5) In the plug socket for an internal combustion engine according to any one of (1) to (4), the outer circumferences of the tips of the plurality of protective claws are curved.

この発明によれば、第１キャップおよび第２キャップに、抵抗体を保持する複数の保持爪と、この複数の保持爪の外側が形成する保持爪円よりも大きく、絶縁パイプの内径に対して０．０１ｍｍ〜０．２ｍｍ小さな保護爪円を外側が形成する複数の保護爪とを設け、保護爪は、絶縁パイプの内周面に全体で当接するため周方向のエッジによって絶縁パイプの内周面を削り取るものではなく、保護爪円は、保持爪に抵抗体の端を保持させたときの保持爪円よりも大きな状態を維持するようにしたので、第１、第２キャップの保持爪円および保護爪が絶縁パイプの内周面に絶縁パイプの内周面が削り取られなくなり、絶縁パイプの要求される耐電圧を確保することができる。
そして、複数の保護爪の外側が円筒面の一部をそれぞれ形成するので、保護爪の外側面は全体で絶縁パイプの内周面に当接し、保護爪の周方向のエッジによる絶縁パイプの内周面の削り取りを防止することができる。
さらに、保持爪と保護爪とを、円周方向へ交互に設けたので、第１、第２キャップは抵抗体をバランスよく確実に保持することができる。
そして、保持爪と保護爪とを、３つずつにしたので、簡単な構成の第１、第２キャップで抵抗体をバランスよく確実に保持することができる。
さらに、複数の保護爪の先端外周を、曲面にしたので、保護爪の先端外周が絶縁パイプの内周面に当接しても、保護爪の先端外周による絶縁パイプの内周面の削り取りを防止することができる。 According to this invention, the first cap and the second cap have a plurality of holding claws that hold the resistor and a holding claw circle formed by the outside of the plurality of holding claws, and are larger than the inner diameter of the insulating pipe. 0.01mm~0.2mm provided a plurality of protection claws forming a small protective nail circle outside, protecting nails, inner periphery of the insulating pipe by a circumferential edge to abut across the inner circumferential surface of the insulated pipe The protective claw circle is not scraped off, and the holding claw circle is maintained larger than the holding claw circle when the holding claw holds the end of the resistor, so that the holding claw circles of the first and second caps are maintained. In addition, the protective claw does not scrape the inner peripheral surface of the insulating pipe on the inner peripheral surface of the insulating pipe, and the withstand voltage required for the insulating pipe can be ensured.
Since the outer sides of the plurality of protective claws form a part of the cylindrical surface, the outer outer surfaces of the protective claws are in contact with the inner peripheral surface of the insulating pipe as a whole, and the inner edge of the insulating pipe is formed by the circumferential edges of the protective claws. It is possible to prevent the peripheral surface from being scraped off.
Furthermore, since the holding claw and the protective claw are alternately provided in the circumferential direction, the first and second caps can hold the resistor in a balanced manner.
Since the holding claws and the protective claws are provided in three, the resistor can be securely held in a balanced manner by the first and second caps having a simple configuration.
In addition, since the outer circumferences of the tips of the multiple protective claws are curved, even if the outer circumferences of the tips of the protective claws abut against the inner circumference of the insulated pipe, the inner circumference of the insulated pipe is prevented from being scraped off by the outer circumferences of the tips of the protective claws. can do.

以下、この発明の実施例を図に基づいて説明する。 Embodiments of the present invention will be described below with reference to the drawings.

図１はこの発明の一実施例である内燃機関用プラグソケットの概略構成を示す部分断面図、図２は図１に示した導電体アッセンブリの拡大正面図、図３は図１および図２に示した第１キャップおよび第２キャップの拡大正面図、図４は図３に示した第１キャップおよび第２キャップの底面図、図５は図４のＡ−Ａ線による断面図であり、図６と同一または相当部分に同一符号を付してある。 1 is a partial cross-sectional view showing a schematic configuration of a plug socket for an internal combustion engine according to an embodiment of the present invention, FIG. 2 is an enlarged front view of the conductor assembly shown in FIG. 1, and FIG. 3 is shown in FIGS. 4 is an enlarged front view of the first cap and the second cap shown, FIG. 4 is a bottom view of the first cap and the second cap shown in FIG. 3, and FIG. 5 is a sectional view taken along line AA of FIG. 6 are denoted by the same reference numerals.

この実施例における導電体アッセンブリ４５は、図１または図２に示すように、絶縁ケースの高圧筒内の高圧端子に一端（上端）が接続される、例えば、コイルスプリングで構成された第１導電材４６と、この第１導電材４６の他端（下端）に取り付けて接続された第１キャップ４７と、この第１キャップ４７に一端（上端）側を保持される抵抗体４８と、この抵抗体４８の他端（下端）側を保持する第２キャップ４９と、この第２キャップ４９に一端（上端）を取り付けて接続され、他端（下端）が点火プラグの頂部電極に接続される、例えば、コイルスプリングで構成された第２導電材５０とで構成されている。 As shown in FIG. 1 or FIG. 2, the conductor assembly 45 in this embodiment is connected to the high-voltage terminal in the high-pressure cylinder of the insulating case, and is connected to one end (upper end), for example, a first conductive material constituted by a coil spring. A first cap 47 attached to and connected to the other end (lower end) of the first conductive material 46, a resistor 48 having one end (upper end) side held by the first cap 47, and this resistance A second cap 49 that holds the other end (lower end) side of the body 48, and one end (upper end) attached to the second cap 49 and connected, and the other end (lower end) is connected to the top electrode of the spark plug; For example, it is comprised with the 2nd electrically-conductive material 50 comprised with the coil spring.

上記した第１キャップ４７（第２キャップ４９）は、図３〜図５に示すように、平板で円形の基板部４７ｂ（基板部４９ｂ）と、この基板部４７ｂ（基板部４９ｂ）の中心を中心とし、加工によって基板部４７ｂ（基板部４９ｂ）の一方の面から膨出させられ、第１導電材４６（第２導電材５０）へ圧入される接続取付部４７ｃ（接続取付部４９ｃ）と、基板部４７ｂ（基板部４９ｂ）の周縁から接続取付部４７ｃ（接続取付部４９ｃ）と反対側で周方向へ等間隔に折り曲げられて起立し、基板部４７ｂ（基板部４９ｂ）の中心を中心とした同心円の保持爪円Ｈを外側が形成する複数、例えば、３つの保持爪４７ｈ（保持爪４９ｈ）と、基板部４７ｂ（基板部４９ｂ）の周縁から接続取付部４７ｃ（接続取付部４９ｃ）と反対側で周方向へ保持爪４７ｈ（保持爪４９ｈ）と交互に等間隔に折り曲げられて保持爪４７ｈ（保持爪４９ｈ）よりも高く（長く）起立し、基板部４７ｂ（基板部４９ｂ）の中心を中心として保持爪円Ｈよりも大きく、絶縁パイプ４４の内径に対して０．０１ｍｍ〜０．２ｍｍ小さな保護爪円Ｐを外側面が形成する複数、例えば、３つの保護爪４７ｐ（保護爪４９ｐ）とで構成されている。 As shown in FIGS. 3 to 5, the first cap 47 (second cap 49) described above is a flat and circular substrate portion 47 b (substrate portion 49 b) and the center of the substrate portion 47 b (substrate portion 49 b). A connection mounting portion 47c (connection mounting portion 49c) that is bulged from one surface of the substrate portion 47b (substrate portion 49b) by processing and press-fitted into the first conductive material 46 (second conductive material 50); The substrate portion 47b (substrate portion 49b) is erected by being bent at equal intervals in the circumferential direction on the opposite side of the connection attachment portion 47c (connection attachment portion 49c) from the periphery, and centered on the center of the substrate portion 47b (substrate portion 49b) A plurality of, for example, three holding claws 47h (holding claws 49h) that form the concentric holding claw circle H, and a connection attachment portion 47c (connection attachment portion 49c) from the periphery of the substrate portion 47b (substrate portion 49b). Keep in the circumferential direction on the opposite side The claw 47h (holding claw 49h) is alternately bent at equal intervals to stand higher (longer) than the holding claw 47h (holding claw 49h), and the holding claw circle H around the center of the substrate portion 47b (substrate portion 49b) And a plurality of, for example, three protective claws 47p (protective claws 49p) whose outer surface forms a protective claw circle P that is 0.01 mm to 0.2 mm smaller than the inner diameter of the insulating pipe 44. .

そして、保持爪４７ｈ（保持爪４９ｈ）は、自身の弾性で抵抗体４８の端を保持できるように、側面視Ｓ字状に折り曲げられ、基板部４７ｂ（基板部４９ｂ）から離れる方向へ先端が拡開している。
また、保護爪４７ｐ（保護爪４９ｐ）は、先端外周が、同一断面で周方向へ連続する曲面４７ｒ（曲面４９ｒ）（外側へ膨出する凸曲面）とされている。
このように、第１キャップ４７と第２キャップ４９とは、同じ構成とされている。
なお、保持爪４７ｈ，４９ｈに抵抗体４８の端を保持させても、保持爪円Ｈは保護爪円Ｐよりも小さな状態を維持する。
そして、保護爪円Ｐと絶縁パイプ４４の内径との差が０．０１ｍｍ未満になると、第１、第２キャップ４７，４９を絶縁パイプ４４内へ挿入しにくくなり、また、保護爪円Ｐと絶縁パイプ４４の内径との差が０．２ｍｍを超えると、絶縁パイプ４４の内周面と第１、第２キャップ４７，４９との隙間が大きくなるので、保護爪円Ｐを、絶縁パイプ４４の内径に対して０．０１ｍｍ〜０．２ｍｍ小さくする。
また、３つの保護爪４７ｐ，４９ｐの外側は、保護爪円Ｐの円筒面をそれぞれ形成している。 The holding claw 47h (holding claw 49h) is bent in an S-shape when viewed from the side so that the end of the resistor 48 can be held by its own elasticity, and the tip of the holding claw 47h is away from the substrate portion 47b (substrate portion 49b). It is expanding.
The protective claw 47p (protective claw 49p) has a curved outer surface 47r (curved surface 49r) (convex curved surface bulging outward) with the same outer section and continuous circumferential direction.
As described above, the first cap 47 and the second cap 49 have the same configuration.
Even if the holding claws 47h and 49h hold the end of the resistor 48, the holding claw circle H remains smaller than the protective claw circle P.
When the difference between the protective claw circle P and the inner diameter of the insulating pipe 44 is less than 0.01 mm, it becomes difficult to insert the first and second caps 47 and 49 into the insulating pipe 44. When the difference between the inner diameter of the insulating pipe 44 exceeds 0.2 mm, the gap between the inner peripheral surface of the insulating pipe 44 and the first and second caps 47 and 49 becomes large. The inner diameter is made smaller by 0.01 mm to 0.2 mm.
Further, the outer surfaces of the three protective claws 47p and 49p form cylindrical surfaces of the protective claw circle P, respectively.

上記した第２導電材５０には、絶縁パイプ４４の係止段部４４ｓに下端が当接し、絶縁パイプ４４の係止段部４４ｓよりも上側の内径が外径とされた太径部５０ｂが設けられている。
なお、この発明における絶縁パイプ４４の内径とは、図１および図６に示すように、絶縁パイプ４４の係止段部４４ｓ（肉盛り部４４ｐ）よりも上側の内径を言う。 The above-described second conductive material 50 has a large-diameter portion 50b whose lower end is in contact with the engaging step 44s of the insulating pipe 44 and whose inner diameter is higher than the engaging step 44s of the insulating pipe 44. Is provided.
In addition, as shown in FIG. 1 and FIG. 6, the inner diameter of the insulating pipe 44 in the present invention refers to the inner diameter on the upper side of the locking step portion 44s (the built-up portion 44p) of the insulating pipe 44.

上述したように、この発明の一実施例によれば、第１キャップ４７（第２キャップ４９）に、抵抗体４８を保持する３つの保持爪４７ｈ（保持爪４９ｈ）と、この３つの保持爪４７ｈ（保持爪４９ｈ）の外側が形成する保持爪円Ｈよりも大きく、絶縁パイプ４４の内径に対して０．０１ｍｍ〜０．２ｍｍ小さな保護爪円Ｐを外側が形成する３つの保護爪４７ｐ（保護爪４９ｐ）とを設けたので、第１、第２キャップ４７，４９の保護爪４７ｐ，４９ｐが絶縁パイプ４４の内周面に衝突する衝撃がなくなることによって絶縁パイプ４４の内周面が削り取られなくなり、絶縁パイプ４４の要求される耐電圧を確保することができる。
そして、保持爪４７ｈ，４９ｈの先端を拡開させたので、抵抗体４８の挿入、保持が容易となり、確実に組み立てた導電体アッセンブリ４５を供給することができる。
さらに、３つの保護爪４７ｐ，４９ｐの外側が円筒面の一部をそれぞれ形成するので、保護爪４７ｐ，４９ｐの外側面は全体で絶縁パイプ４４の内周面に当接し、保護爪４７ｐ，４９ｐの周方向のエッジによる絶縁パイプ４４の内周面の削り取りを防止することができる。
そして、保持爪４７ｈ，４９ｈと保護爪４７ｐ，４９ｐとを、円周方向へ交互に設けたので、第１、第２キャップ４７，４９は抵抗体４８をバランスよく確実に保持することができる。
さらに、保持爪４７ｈ，４９ｈと保護爪４７ｐ，４９ｐとを、３つずつにしたので、簡単な構成の第１、第２キャップ４７，４９で抵抗体４８をバランスよく確実に保持することができる。
そして、３つの保護爪４７ｐ，４９ｐの先端外周を、曲面４７ｒ，４９ｒにしたので、保護爪４７ｐ，４９ｐの先端外周が絶縁パイプ４４の内周面に当接しても、保護爪４７ｐ，４９ｐの先端外周による絶縁パイプ４４の内周面の削り取りを防止することができる。 As described above, according to one embodiment of the present invention, the first cap 47 (second cap 49) has the three holding claws 47h (holding claws 49h) for holding the resistor 48, and the three holding claws. Three protective claws 47p (on the outside forming a protective claw circle P larger than the holding claw circle H formed on the outer side of 47h (holding claw 49h) and smaller by 0.01 mm to 0.2 mm than the inner diameter of the insulating pipe 44) Since the protective claws 49p) are provided, the impact of the protective claws 47p, 49p of the first and second caps 47, 49 colliding with the inner peripheral surface of the insulating pipe 44 is eliminated, so that the inner peripheral surface of the insulating pipe 44 is scraped off. Thus, the required withstand voltage of the insulating pipe 44 can be ensured.
And since the front-end | tip of holding nail | claw 47h and 49h was expanded, the insertion and holding | maintenance of the resistor 48 become easy, and the conductor assembly 45 assembled reliably can be supplied.
Further, since the outer sides of the three protective claws 47p and 49p respectively form part of the cylindrical surface, the outer surfaces of the protective claws 47p and 49p abut on the inner peripheral surface of the insulating pipe 44 as a whole, and the protective claws 47p and 49p It is possible to prevent the inner peripheral surface of the insulating pipe 44 from being scraped off by the circumferential edge.
Since the holding claws 47h and 49h and the protective claws 47p and 49p are alternately provided in the circumferential direction, the first and second caps 47 and 49 can securely hold the resistor 48 in a balanced manner.
Further, since the holding claws 47h and 49h and the protective claws 47p and 49p are provided in three, the resistor 48 can be securely held in a balanced manner by the first and second caps 47 and 49 having a simple configuration. .
Since the outer circumferences of the tips of the three protective claws 47p and 49p are curved surfaces 47r and 49r, even if the outer circumferences of the distal ends of the protective claws 47p and 49p abut on the inner circumferential surface of the insulating pipe 44, the protective claws 47p and 49p It is possible to prevent the inner peripheral surface of the insulating pipe 44 from being scraped off by the outer periphery of the tip.

上記した実施例では、第１、第２キャップ４７，４９の保持爪４７ｈ，４９ｈおよび保護爪４７ｐ，４９ｐを３つにした例を示したが、保持爪および保護爪は３つ以上であってもよい。
そして、保持爪４７ｈ，４９ｈと保護爪４７ｐ，４９ｐとを円周方向へ等間隔に設けた例を示したが、等間隔でなくでもよい。
また、高圧筒嵌合部４２、プラグ嵌合部４３、絶縁パイプ４４を別体にした例を示したが、高圧筒嵌合部と絶縁パイプとを一体に構成してプラグ嵌合部を別体にしたり、プラグ嵌合部と絶縁パイプとを一体に構成して高圧筒嵌合部を別体にしたり、高圧筒嵌合部、プラグ嵌合部、絶縁パイプを一体に構成してもよい。 In the above-described embodiment, an example in which the holding claws 47h and 49h and the protective claws 47p and 49p of the first and second caps 47 and 49 are three is shown, but there are three or more holding claws and protective claws. Also good.
In addition, although the example in which the holding claws 47h and 49h and the protective claws 47p and 49p are provided at equal intervals in the circumferential direction has been shown, it may not be equal intervals.
In addition, although the example in which the high-pressure cylinder fitting part 42, the plug fitting part 43, and the insulating pipe 44 are separated is shown, the high-pressure cylinder fitting part and the insulating pipe are integrally configured to separate the plug fitting part. Or the plug fitting portion and the insulating pipe may be configured integrally to separate the high pressure cylinder fitting portion, or the high pressure cylinder fitting portion, the plug fitting portion, and the insulating pipe may be configured integrally. .

この発明の一実施例である内燃機関用プラグソケットの概略構成を示す部分断面図である。1 is a partial cross-sectional view showing a schematic configuration of a plug socket for an internal combustion engine according to an embodiment of the present invention. 図１に示した導電体アッセンブリの拡大正面図である。It is an enlarged front view of the conductor assembly shown in FIG. 図１および図２に示した第１キャップおよび第２キャップの拡大正面図である。FIG. 3 is an enlarged front view of a first cap and a second cap shown in FIGS. 1 and 2. 図３に示した第１キャップおよび第２キャップの底面図である。FIG. 4 is a bottom view of the first cap and the second cap shown in FIG. 3. 図４のＡ−Ａ線による断面図である。It is sectional drawing by the AA line of FIG. 従来の内燃機関用プラグソケットを用いた内燃機関用点火コイル装置をエンジンに取り付けた状態の概略構成を示す部分断面図である。It is a fragmentary sectional view which shows schematic structure of the state which attached the ignition coil apparatus for internal combustion engines using the conventional plug socket for internal combustion engines to the engine.

Explanation of symbols

１１内燃機関用点火コイル装置
２１内燃機関用点火コイル
２２絶縁ケース
２２ｆ取付フランジ部
２２ｓソケット部
２２ｔ高圧筒（高圧タワー部）
２４高圧端子（二次端子）
３４取付ねじ
４１内燃機関用プラグソケット
４２高圧筒嵌合部（ラバー部）
４３プラグ嵌合部（ブーツ部）
４４絶縁パイプ
４４ｐ肉盛り部
４４ｓ係止段部
４５導電体アッセンブリ
４６第１導電材
４７第１キャップ
４７ｂ基板部
４７ｃ接続取付部
４７ｈ保持爪
４７ｐ保護爪
４７ｒ曲面
４８抵抗体
４９第２キャップ
４９ｂ基板部
４９ｃ接続取付部
４９ｈ保持爪
４９ｐ保護爪
４９ｒ曲面
５０第２導電材
５０ｂ太径部
６１エンジン
６２プラグホール
６２ｓ取付ねじ孔
６３取付部
７１点火プラグ
７２頂部電極
７３中心電極
７４絶縁碍子
７５金具
７５ｓ雄ねじ部
７５ｅ電極
Ｈ保持爪円
Ｐ保護爪円 11 Ignition Coil Device for Internal Combustion Engine 21 Ignition Coil for Internal Combustion Engine 22 Insulating Case 22f Mounting Flange 22s Socket 22t High Pressure Cylinder (High Pressure Tower)
24 High voltage terminal (secondary terminal)
34 Mounting screw 41 Plug socket for internal combustion engine 42 High pressure cylinder fitting part (rubber part)
43 Plug fitting part (boot part)
44 Insulating pipe 44p Overlaying portion 44s Locking step portion 45 Conductor assembly 46 First conductive material 47 First cap 47b Substrate portion 47c Connection mounting portion 47h Holding claw 47p Protective claw 47r Curved surface 48 Resistor 49 Second cap 49b Substrate portion 49c Connection mounting portion 49h Holding claw 49p Protection claw 49r Curved surface 50 Second conductive material 50b Large diameter portion 61 Engine 62 Plug hole 62s Mounting screw hole 63 Mounting portion 71 Spark plug 72 Top electrode 73 Center electrode 74 Insulator 75 Metal fitting 75s Male screw portion 75e Electrode H Holding claw circle P Protection claw circle

Claims

An internal combustion engine ignition coil attached to the engine, and a high-pressure cylinder fitting portion that covers a high-pressure cylinder that enters the plug hole of the engine shallowly;
A plug fitting portion covering an insulator having a top electrode of a spark plug attached to the bottom of the plug hole;
An insulating pipe that connects the plug fitting portion and the high-pressure cylinder fitting portion;
A first conductor connected at one end to the high-voltage terminal in the high-pressure cylinder, a first cap connected to the other end of the first conductor, and one end side of the first cap A resistor to be held, a second cap for holding the other end of the resistor, and a second conductor having one end connected to the second cap and the other end connected to the top electrode are provided. ,
In an internal combustion engine plug socket for supplying a high voltage from the high voltage terminal in the high pressure cylinder to the top electrode of the spark plug,
Each of the first cap and the second cap is a flat and circular substrate portion, and is bulged from one surface of the substrate portion around the center of the substrate portion, so that the first and second conductive portions A connection attachment portion that is press-fitted into the material, and is bent in an S-shape in side view so that the end of the resistor can be held by its own elasticity in the circumferential direction from the periphery of the substrate portion on the side opposite to the connection attachment portion. A plurality of holding claws whose outer ends form concentric holding claw circles centered on the center of the substrate portion, and a peripheral edge of the substrate portion. It is bent in the circumferential direction on the side opposite to the connection mounting portion and stands higher than the holding claw, and is larger than the holding claw circle around the center of the substrate portion, and 0.01 mm to the inner diameter of the insulating pipe 0.2mm small protective nail circle And a plurality of protection claws sides to form,
The protective claw does not scrape the inner peripheral surface of the insulating pipe by a circumferential edge because the protective claw contacts the inner peripheral surface of the insulating pipe as a whole . Maintaining a state larger than the holding claw circle when the end is held;
A plug socket for an internal combustion engine.

The plug socket for an internal combustion engine according to claim 1,
The outer sides of the plurality of protective claws each form part of a cylindrical surface;
A plug socket for an internal combustion engine.

The plug socket for an internal combustion engine according to claim 1 or 2,
The holding claw and the protective claw were alternately provided in the circumferential direction.
A plug socket for an internal combustion engine.

The plug socket for an internal combustion engine according to claim 3,
The holding claw and the protective claw were divided into three,
A plug socket for an internal combustion engine.

The plug socket for an internal combustion engine according to any one of claims 1 to 4,
The outer periphery of the tip of the plurality of protective claws is curved,
A plug socket for an internal combustion engine.