JP2008060228A - Ignition coil - Google Patents

Ignition coil Download PDF

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Publication number
JP2008060228A
JP2008060228A JP2006233626A JP2006233626A JP2008060228A JP 2008060228 A JP2008060228 A JP 2008060228A JP 2006233626 A JP2006233626 A JP 2006233626A JP 2006233626 A JP2006233626 A JP 2006233626A JP 2008060228 A JP2008060228 A JP 2008060228A
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Prior art keywords
ignition coil
plug hole
vent
water retention
retention chamber
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JP4587128B2 (en
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Kazuhide Kawai
川井  一秀
Hidetoshi Akashi
英俊 明石
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Denso Corp
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Denso Corp
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02PIGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P3/00Other installations
    • F02P3/02Other installations having inductive energy storage, e.g. arrangements of induction coils
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00Adaptations of transformers or inductances for specific applications or functions
    • H01F38/12Ignition, e.g. for IC engines

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ignition coil in which the inside and the outside of a plug hole are ventilated and intrusion of water into the plug hole is prevented. <P>SOLUTION: An electrical joint side of an ignition coil 10 to an ignition plug is inserted into a plug hole 3. A ventilation portion 50 is formed on the side of the head 24 of a coil case 20. A water retaining chamber 310 and a communication passage 320 are formed at the ventilation portion 50. The water retaining chamber 310 communicates with the outside of the ignition coil 10 through a vent 312 opening downward toward the upper end face 2a of a cylinder head 2. The communication passage 320 communicates with the water retaining chamber 310 at the upper end thereof in the direction receding from the upper end face 2a farther than the vent 312. A rubber sealing member 60 is press fitted to the inner circumferential side face 51 of the communication side opening 314 at the ventilation portion 50. A plurality of annular protrusions 64 formed in the circumferential direction on the outer circumferential side face are provided on the sealing member 60 in the direction for press fitting to the ventilation portion 50. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、内燃機関の点火プラグに高電圧を加える点火コイルに関する。   The present invention relates to an ignition coil that applies a high voltage to an ignition plug of an internal combustion engine.

従来、内燃機関の点火プラグに高電圧を印加する点火コイルとして、点火プラグを設置するプラグホールに点火プラグとの電気的結合側を挿入しているものが知られている。このような点火コイルにおいては、プラグホール内への水等の侵入を防止するために、点火コイルのケース部材と内燃機関との間をシール部材でシールしている。ところで、周囲温度の変化、あるいは内燃機関運転中の内燃機関への被水等によりプラグホールの温度が変化すると、プラグホール内の気体が膨張および収縮を繰り返す。そこで、プラグホール内の気体の膨張および収縮によるプラグホール内の圧力変化を解消するために、プラグホールの内外を通気する通気通路を形成している点火コイルが知られている(例えば、特許文献1参照)。また、点火コイルに形成されている通気通路は、プラグホールに点火コイルの一部を挿入して点火プラグと電気的に結合するときに、プラグホール内部の空気を通気通路からプラグホールの外部に逃がし、点火コイルの取り付けを容易にする効果もある。
また、特許文献1の点火コイルでは、点火コイルの外部と連通する通気通路の通気口をプラグホールの開口周囲の上端面から上方に離れた位置に開口させ、点火コイルが被水しても通気通路に水が侵入することを防止しようとしている。
2. Description of the Related Art Conventionally, as an ignition coil that applies a high voltage to an ignition plug of an internal combustion engine, an ignition coil in which a side electrically connected to the ignition plug is inserted into a plug hole in which the ignition plug is installed is known. In such an ignition coil, in order to prevent intrusion of water or the like into the plug hole, a seal member seals between the case member of the ignition coil and the internal combustion engine. By the way, when the temperature of the plug hole changes due to a change in the ambient temperature or due to water on the internal combustion engine during operation of the internal combustion engine, the gas in the plug hole repeatedly expands and contracts. Therefore, in order to eliminate the pressure change in the plug hole due to the expansion and contraction of the gas in the plug hole, an ignition coil is known that forms a ventilation passage that ventilates the inside and outside of the plug hole (for example, Patent Documents). 1). In addition, the ventilation passage formed in the ignition coil allows air inside the plug hole to flow from the ventilation passage to the outside of the plug hole when a part of the ignition coil is inserted into the plug hole and electrically connected to the ignition plug. It also has the effect of facilitating escape and mounting of the ignition coil.
Further, in the ignition coil disclosed in Patent Document 1, the vent of the vent passage communicating with the outside of the ignition coil is opened at a position away from the upper end surface around the opening of the plug hole so that the vent is vented even if the ignition coil is submerged. It is trying to prevent water from entering the passage.

しかしながら、このように通気通路の通気口をプラグホールの開口周囲の上端面から上方に離しても、一旦通気口から通気通路に水が侵入すると、通気通路を通ってプラグホール内に水が侵入する恐れがある。特に、温度低下等によりプラグホール内の気体が収縮し、プラグホール内が負圧になると通気口から水を吸入しやすいという問題がある。   However, even if the vent of the vent passage is separated upward from the upper end surface around the opening of the plug hole in this way, once water enters the vent passage from the vent, water enters the plug hole through the vent passage. There is a fear. In particular, there is a problem that when the gas in the plug hole contracts due to a temperature drop or the like and the plug hole has a negative pressure, water is easily sucked from the vent.

特開平9−158820号公報JP-A-9-158820

本発明は、上記問題を解決するためになされたものであり、プラグホールの内外を通気するとともに、プラグホール内に水が浸入することを防止する点火コイルを提供することを目的とする。   The present invention has been made to solve the above problem, and an object thereof is to provide an ignition coil that ventilates the inside and outside of a plug hole and prevents water from entering the plug hole.

請求項1から32に記載の発明によると、ケース部材に設けられた通気部は、プラグホールの開口周囲の上端面から離れる上方に通気口側から延びている保水室、ならびに、プラグホールの開口周囲の上端面から通気口よりも離れる方向の保水室の上方端部とプラグホール側とを連通する連通路を有している。そして、保水室と連通路とが連通している側に開口している通気部の連通側開口は塞がれている。   According to the first to thirty-second aspects of the present invention, the vent provided in the case member includes a water retention chamber extending from the vent hole side away from the upper end surface around the opening of the plug hole, and the opening of the plug hole. A communication path is provided that connects the upper end of the water retention chamber and the plug hole side in a direction away from the vent from the upper end surface of the periphery. And the communication side opening of the ventilation | gas_flowing part currently opened to the side which the water retention chamber and the communication path are connecting is obstruct | occluded.

したがって、通気口から保水室に侵入した水は、保水室の上方端部まで上昇しないと連通路、つまりプラグホール側に流入しない。この構成によれば、保水室の容積で通気口から侵入した水を保持できるので、保水室に水が侵入しても保水室からプラグホール側への水の侵入を防止できる。
また、請求項1から5に記載の発明によると、通気部の連通側開口の内周側面に向けて封止部材の外周側面から突出する環状突部が通気部への圧入方向に複数設置され、複数の環状突部が弾性変形して封止部材が通気部に圧入されるので、封止部材の傾きを防止できる。さらに、通気部の連通側開口を封止部材の環状突部が多重にシールするので、通気部のシール性が向上する。
Therefore, the water that has entered the water retention chamber from the vent does not flow into the communication path, that is, the plug hole side unless it rises to the upper end of the water retention chamber. According to this configuration, water that has entered from the vent hole can be retained by the volume of the water retention chamber, so that even if water enters the water retention chamber, water can be prevented from entering the plug hole side.
According to the invention described in claims 1 to 5, a plurality of annular protrusions protruding from the outer peripheral side surface of the sealing member toward the inner peripheral side surface of the communication side opening of the vent portion are installed in the press-fitting direction into the vent portion. Since the plurality of annular protrusions are elastically deformed and the sealing member is press-fitted into the ventilation portion, the inclination of the sealing member can be prevented. Further, since the annular protrusion of the sealing member seals the communication side opening of the ventilation portion in multiple layers, the sealing performance of the ventilation portion is improved.

請求項2に記載の発明によると、環状突部の幅は突出方向に向けて狭くなっており、環状突部は通気部への圧入方向と反対側に傾斜している。したがって、通気部への封止部材の圧入が容易であり、かつ封止部材が通気部から脱落することを防止できる。
請求項3に記載の発明によると、保水室を形成する通気部の内周側面に形成された当接リブにより、通気部内への封止部材の落ち込みを防止できる。また、保水室内に侵入した水が当接リブに衝突することにより、保水室に侵入した水の撥ねを低減できる。したがって、保水室に侵入した水が連通路に侵入することを防止できる。
According to the second aspect of the present invention, the width of the annular protrusion is narrowed in the protruding direction, and the annular protrusion is inclined to the side opposite to the press-fitting direction into the ventilation portion. Therefore, it is easy to press-fit the sealing member into the ventilation portion, and it is possible to prevent the sealing member from dropping from the ventilation portion.
According to the invention described in claim 3, the contact rib formed on the inner peripheral side surface of the ventilation portion forming the water retention chamber can prevent the sealing member from dropping into the ventilation portion. Further, the water that has entered the water retention chamber collides with the abutment rib, so that the splash of the water that has entered the water retention chamber can be reduced. Therefore, it is possible to prevent water that has entered the water retention chamber from entering the communication path.

請求項4に記載の発明によると、コイル部を収容するケース部材の収容孔と保水室とを仕切る隔壁に一体に形成されている通路リブに連通路が形成されているので、隔壁の機械的強度が向上する。したがって、通気部に封止部材を圧入するときに、隔壁の変形を防止できる。
請求項5に記載の発明によると、封止部材の通気部への圧入方向で連通路の開口周囲端面が封止部材と当接するので、連通路の開口周囲端面により通気部内への封止部材の落ち込みを防止できる。そして、連通路の開口周囲端面に保水室と連通する溝通路が形成されているので、連通路の開口周囲端面に封止部材が当接しても、保水室と連通路とは溝通路により連通している。
According to the fourth aspect of the present invention, the communication path is formed in the passage rib formed integrally with the partition wall that partitions the housing hole and the water retention chamber of the case member that houses the coil portion. Strength is improved. Therefore, the deformation of the partition wall can be prevented when the sealing member is press-fitted into the ventilation portion.
According to the fifth aspect of the invention, since the opening peripheral end surface of the communication path contacts the sealing member in the press-fitting direction of the sealing member into the ventilation portion, the sealing member into the ventilation portion is formed by the opening peripheral end surface of the communication path. Can be prevented. Further, since the groove passage communicating with the water retention chamber is formed on the peripheral edge of the opening of the communication passage, the water retention chamber and the communication passage communicate with each other through the groove passage even if the sealing member abuts on the peripheral edge of the opening of the communication passage. is doing.

請求項6に記載の発明によると、通気部の連通側開口を塞ぐ封止部材と通気部とを接着剤で接着しているので、簡単な形状の封止部材、例えば板状の封止部材を使用できる。
請求項7に記載の発明によると、ケース部材内に充填されてコイル部を覆う絶縁樹脂材で、通気部に封止部材を固定するので、絶縁樹脂材の充填工程と封止部材の固定工程とを兼ねることができる。したがって、点火コイルの製造工数を低減できる。
According to the invention described in claim 6, since the sealing member that closes the communication side opening of the ventilation portion and the ventilation portion are bonded with the adhesive, a simple shape sealing member, for example, a plate-like sealing member Can be used.
According to the invention described in claim 7, since the sealing member is fixed to the ventilation portion with the insulating resin material that fills the case member and covers the coil portion, the insulating resin material filling step and the sealing member fixing step It can also serve as. Therefore, the number of manufacturing steps of the ignition coil can be reduced.

請求項8に記載の発明によると、封止部材の連通路と向き合う裏面に、保水室と連通している連通路の開口周囲側方に延びる壁が形成されている。したがって封止部材の裏面に結露等により水滴が付着しても、封止部材の裏面に形成された壁により連通路の開口に向かう水滴の流れを遮ることができる。
請求項9または10に記載の発明によると、熱溶着または熱融着により、通気部の連通側開口を樹脂シートで形成された封止部材が塞ぐので、通気部への封止部材の取付作業が容易である。
According to the eighth aspect of the present invention, the wall extending to the side of the periphery of the opening of the communication path communicating with the water retention chamber is formed on the back surface facing the communication path of the sealing member. Therefore, even if water droplets adhere to the back surface of the sealing member due to condensation or the like, the flow of water droplets toward the opening of the communication path can be blocked by the wall formed on the back surface of the sealing member.
According to the invention described in claim 9 or 10, since the sealing member formed of the resin sheet closes the communication side opening of the ventilation portion by heat welding or heat fusion, the mounting operation of the sealing member to the ventilation portion Is easy.

請求項11に記載の発明によると、封止部材の色がケース部材の色と異なっているので、封止部材の取り付けを容易に確認できる。
請求項12から20に記載の発明によると、ケース部材のケース開口部および封止部材をカバーで覆うので、封止部材が直接被水することを防止できる。また、封止部材がカバーに覆われ点火コイルの外部から見えないので、封止部材により塞がれている封止箇所への加工を防止できる。
According to the eleventh aspect of the invention, since the color of the sealing member is different from the color of the case member, it is possible to easily confirm the attachment of the sealing member.
According to invention of Claim 12 to 20, since the case opening part and sealing member of a case member are covered with a cover, it can prevent that a sealing member gets wet directly. In addition, since the sealing member is covered with the cover and cannot be seen from the outside of the ignition coil, it is possible to prevent processing of the sealed portion blocked by the sealing member.

請求項12に記載の発明によると、カバーの保水室側の裏面に封止部材の支持部を設け、支持部に支持された状態で、封止部材は通気部の連通側開口を塞いでいる。この構成によれば、ケース部材にカバーを取り付ける工程で、通気部に封止部材を取り付けることができるので、点火コイルの製造工数を低減できる。
請求項14に記載の発明によると、カバーの外周縁はケース部材のケース開口部の外周縁よりも内側に位置しており、カバーの表面の角部は凸曲面であり、カバーの高さHの上限を5mmにし、カバーの凸曲面からケース開口部に延びる直線部の長さをLの上限を2mmにしているので、指等がカバーに引っ掛かりにくくなっている。したがって、ケース部材からカバーを取り外すことを防止できる。
According to the twelfth aspect of the present invention, the sealing member support portion is provided on the back surface of the cover on the water retention chamber side, and the sealing member blocks the communication side opening of the ventilation portion in a state of being supported by the support portion. . According to this configuration, since the sealing member can be attached to the ventilation portion in the step of attaching the cover to the case member, the number of manufacturing steps of the ignition coil can be reduced.
According to the invention described in claim 14, the outer peripheral edge of the cover is located inside the outer peripheral edge of the case opening of the case member, the corner of the surface of the cover is a convex curved surface, and the height H of the cover Is set to 5 mm, and the length of the straight portion extending from the convex curved surface of the cover to the case opening is set to 2 mm, so that fingers or the like are not easily caught by the cover. Therefore, it is possible to prevent the cover from being removed from the case member.

請求項15に記載の発明によると、カバーはケース部材に外側から複数の階段状に嵌合しており、カバーのケース部材との階段状の嵌合箇所に、ケース部材内への水の進入を防ぐU字状の折り返しが形成されているので、カバーとケース部材との嵌合隙間からケース部材内に水が侵入することを防止できる。
請求項16に記載の発明によると、カバーはケース部材に外側から嵌合しており、嵌合箇所の周方向の少なくとも一箇所に水抜き通路が形成されているので、カバーとケース部材との嵌合隙間に侵入した水が、水抜き通路から点火コイルの外部に排出される。
According to the invention described in claim 15, the cover is fitted to the case member in a plurality of steps from the outside, and water enters the case member at the step-like fitting portion with the case member of the cover. Since the U-shaped fold is formed to prevent the water from entering the case member through the fitting gap between the cover and the case member.
According to the invention described in claim 16, since the cover is fitted to the case member from the outside, and the drainage passage is formed in at least one place in the circumferential direction of the fitting place, the cover and the case member Water that has entered the fitting gap is discharged from the drainage passage to the outside of the ignition coil.

請求項17に記載の発明によると、内燃機関に搭載した状態で、カバーとケース部材との嵌合箇所の下方側に水抜き通路が形成されているので、カバーとケース部材との嵌合隙間に侵入した水が水抜き通路に集まり、水抜き通路から排出される。
請求項18に記載の発明によると、水抜き通路に向かう案内リブがカバーの裏面に形成されているので、カバーの裏面に付着した水滴が案内リブに沿って水抜き通路に向かい、水抜き通路から排出される。また、カバーの裏面に形成された案内リブにより、カバーの機械的強度が向上するので、反り、ねじれ等のカバーの変形を防止できる。
According to the seventeenth aspect of the present invention, since the drainage passage is formed on the lower side of the fitting portion between the cover and the case member in the state of being mounted on the internal combustion engine, the fitting gap between the cover and the case member is formed. Water that has entered the water gathers in the drainage passage and is discharged from the drainage passage.
According to the eighteenth aspect of the present invention, since the guide rib toward the drainage passage is formed on the back surface of the cover, water droplets adhering to the back surface of the cover are directed along the guide rib toward the drainage passage. Discharged from. Further, the guide ribs formed on the back surface of the cover improve the mechanical strength of the cover, so that deformation of the cover such as warping and twisting can be prevented.

請求項19に記載の発明によると、カバーに形成した嵌合穴にケース部材から突出する嵌合突部が嵌合した状態で嵌合突部がかしめられているので、カバーがケース部材に強固に取り付けられる。
請求項20に記載の発明によると、カバーの色はケース部材の色と異なっているので、点火コイルのデザイン性が向上する。
According to the nineteenth aspect of the invention, since the fitting protrusion is caulked in a state where the fitting protrusion protruding from the case member is fitted into the fitting hole formed in the cover, the cover is firmly attached to the case member. Attached to.
According to the twentieth aspect, since the color of the cover is different from the color of the case member, the design of the ignition coil is improved.

請求項21および26に記載の発明によると、保水室の底部の長手方向両端に通気口が形成されているので、例えば車両が坂道走行して点火コイルが傾斜したり、点火コイルを傾斜して搭載する場合にも、長手方向両端に形成された通気口の一方から保水室に侵入した水が排出される。
請求項22および27に記載の発明によると、保水室と連通している連通路の開口と通気口とがほぼ最大離隔位置に配置されているので、通気口から保水室に侵入した水が連通路に侵入することを防止できる。
According to the inventions of claims 21 and 26, since the vents are formed at both longitudinal ends of the bottom of the water retention chamber, for example, the vehicle runs on a slope and the ignition coil is inclined, or the ignition coil is inclined. Also in the case of mounting, water that has entered the water retention chamber is discharged from one of the vents formed at both ends in the longitudinal direction.
According to the invention described in claims 22 and 27, since the opening of the communication passage communicating with the water retention chamber and the vent are arranged at the substantially maximum separation position, the water that has entered the water retention chamber through the vent is communicated. Intrusion into the passage can be prevented.

請求項23および28に記載の発明によると、通気口の迷路構造で水が遮られるので、通気口から保水室に水が侵入することを妨げることができる。
請求項24および29に記載の発明によると、通気部からプラグホールの開口周囲の上端面に向けて下方に突出する突部に通気口が形成されているので、通気口の開口周囲の面積が小さい。したがって、通気口の開口周囲の面に沿って通気口に水が侵入しにくい。
According to the invention described in claims 23 and 28, since water is blocked by the labyrinth structure of the vent, it is possible to prevent water from entering the water holding chamber from the vent.
According to the invention described in claims 24 and 29, since the vent is formed in the protrusion protruding downward from the vent toward the upper end surface around the opening of the plug hole, the area around the vent opening is small. small. Therefore, it is difficult for water to enter the vent along the surface around the vent opening.

請求項25および30に記載の発明によると、多孔質または網目状の充填材が保水室に充填されているので、保水室内に侵入した水の撥ねを低減できる。したがって、保水室に侵入した水が連通路に侵入することを防止できる。
請求項31に記載の発明によると、プラグホールの開口周囲の上端面に向けて下方に通気口が開口している。この構成によれば、通気口から上方に向けて水が侵入しないと、通気口から保水室に水が侵入しないので、保水室に水が侵入することを妨げることができる。
According to the invention described in claims 25 and 30, since the water retention chamber is filled with the porous or mesh-like filler, the splashing of the water that has entered the water retention chamber can be reduced. Therefore, it is possible to prevent water that has entered the water retention chamber from entering the communication path.
According to the invention of claim 31, the vent is opened downward toward the upper end surface around the opening of the plug hole. According to this configuration, if water does not enter upward from the vent, water does not enter from the vent into the water retention chamber, so that it is possible to prevent water from entering the water retention chamber.

以下、本発明の実施形態を図に基づいて説明する。
(第1実施形態)
本発明の第1実施例による点火コイルを図1に示す。図1に示す点火コイル10は、内燃機関のシリンダヘッド2に気筒毎に形成されたプラグホール3内に、図示しない点火プラグとの電気的結合側およびコイル部30を収容されている。点火コイル10は、図1の下側で点火コイルと電気的に結合している。点火コイル10は、高電圧を発生するコイル部30を筒状にした所謂スティックコイルである。
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
An ignition coil according to a first embodiment of the present invention is shown in FIG. The ignition coil 10 shown in FIG. 1 accommodates an electrical coupling side with a spark plug (not shown) and a coil portion 30 in a plug hole 3 formed for each cylinder in a cylinder head 2 of an internal combustion engine. The ignition coil 10 is electrically coupled to the ignition coil on the lower side of FIG. The ignition coil 10 is a so-called stick coil in which a coil portion 30 that generates a high voltage is cylindrical.

点火コイル10のケース部材としてのコイルケース20は、樹脂で一体成形されており、円筒部22と、プラグホール3の外部に露出している頭部24とを有している。コイルケース20の収容孔300には、図示しない一次コイルおよび二次コイルを同心上に巻回しているコイル部30とイグナイタ32とが収容されている。収容孔300には、絶縁樹脂材としてエポキシ樹脂34が充填されている。イグナイタ32がコイル部30の一次コイルに印加する電圧をスイッチングすることにより、コイル部30の二次コイルに高電圧が発生する。この高電圧が点火プラグに印加されて点火プラグに火花が発生する。   A coil case 20 as a case member of the ignition coil 10 is integrally formed of resin, and has a cylindrical portion 22 and a head portion 24 exposed to the outside of the plug hole 3. In the accommodation hole 300 of the coil case 20, a coil portion 30 and a igniter 32, in which a primary coil and a secondary coil (not shown) are wound concentrically, are accommodated. The accommodation hole 300 is filled with an epoxy resin 34 as an insulating resin material. A high voltage is generated in the secondary coil of the coil unit 30 by switching the voltage applied to the primary coil of the coil unit 30 by the igniter 32. This high voltage is applied to the spark plug, and a spark is generated in the spark plug.

頭部24から径方向外側に突出して取付部25が形成されている。シリンダヘッド2の開口周囲の上端面2aから突出している突部4にボルト8により取付部25が固定されることにより、コイルケース20はシリンダヘッド2に取り付けられている。コイルケース20とシリンダヘッド2との間は、ゴム製のシール部材40によりシールされている。シール部材40はシリンダヘッド2の上端面2aから上方に突出している環状突部6に嵌合している。頭部24のケース開口部26は、樹脂製のカバー36により覆われている。カバー36の色は、コイルケース20の色と同じでもよいし、プラグホール3の外部に露出しているカバー36のデザイン性を向上するために、コイルケース20と異なる色にしてもよい。   A mounting portion 25 is formed so as to protrude radially outward from the head 24. The coil case 20 is attached to the cylinder head 2 by fixing the attachment portion 25 to the protrusion 4 protruding from the upper end surface 2 a around the opening of the cylinder head 2 with the bolt 8. A gap between the coil case 20 and the cylinder head 2 is sealed with a rubber seal member 40. The seal member 40 is fitted in an annular protrusion 6 that protrudes upward from the upper end surface 2 a of the cylinder head 2. The case opening 26 of the head 24 is covered with a resin cover 36. The color of the cover 36 may be the same as the color of the coil case 20 or may be a color different from that of the coil case 20 in order to improve the design of the cover 36 exposed to the outside of the plug hole 3.

通気部50は、頭部24の側方に形成されている。通気部50には、保水室310と、保水室310と連通する連通路320とが形成されている。
図3および図4に示すように、保水室310は,断面を楕円状に形成されており、底部に形成された通気口312側から、上端面2aから離れる上方に延びている。保水室310は、上端面2aに向けて下方に開口する通気口312を通して点火コイル10の外部と連通している。保水室310の容積は約1ccに設定されている。通気口312は、楕円状の保水室310の長手方向両端の底部に形成されている。連通路320は、収容孔300と保水室310とを仕切る隔壁28と一体成形された通路リブ52に形成されている。連通路320は、上端面2aから通気口312よりも離れる方向の保水室310の上方端部で保水室310と連通し、保水室310との連通位置から上端面2aに向けて下方に延びている。連通路320の通路面積は、保水室310の断面積よりも小さい。連通路320が保水室310と連通している側の通路リブ52の開口周囲端面53には、連通路320を跨いで溝54が形成されている。
The ventilation part 50 is formed on the side of the head 24. A water retaining chamber 310 and a communication passage 320 communicating with the water retaining chamber 310 are formed in the ventilation portion 50.
As shown in FIG. 3 and FIG. 4, the water retention chamber 310 has an elliptical cross section, and extends upward away from the upper end surface 2 a from the side of the vent 312 formed in the bottom. The water retention chamber 310 communicates with the outside of the ignition coil 10 through a vent 312 that opens downward toward the upper end surface 2a. The volume of the water retention chamber 310 is set to about 1 cc. The vent 312 is formed at the bottom of both ends in the longitudinal direction of the elliptical water retention chamber 310. The communication passage 320 is formed in a passage rib 52 integrally formed with the partition wall 28 that partitions the accommodation hole 300 and the water retention chamber 310. The communication path 320 communicates with the water retention chamber 310 at the upper end of the water retention chamber 310 in a direction away from the vent 312 from the upper end surface 2a, and extends downward from the communication position with the water retention chamber 310 toward the upper end surface 2a. Yes. The passage area of the communication passage 320 is smaller than the cross-sectional area of the water retention chamber 310. A groove 54 is formed across the communication passage 320 in the opening peripheral end surface 53 of the passage rib 52 on the side where the communication passage 320 communicates with the water retention chamber 310.

頭部24の外周面とシール部材40との間に環状通路330が形成されており、連通路320の保水室310との連通側と反対側の端部は環状通路330と連通している。連通路320と環状通路330との連通箇所に対して径方向反対側の頭部24の外周面に軸方向に溝29が形成されている。この溝29により、シール部材40と頭部24との嵌合箇所に溝通路332が形成されている。溝通路332は、環状通路330とプラグホール3内とを連通している。この通路構成により、通気口312は、保水室310、連通路320、環状通路330、溝通路332を介してプラグホール3内と連通している。したがって、周囲温度の変化、または内燃機関の運転中の点火コイル10への被水等によりプラグホール3内の気体が膨張および収縮しても、プラグホール3の内側と外側とを通気できる。   An annular passage 330 is formed between the outer peripheral surface of the head 24 and the seal member 40, and an end portion of the communication passage 320 opposite to the communication side with the water retention chamber 310 communicates with the annular passage 330. A groove 29 is formed in the axial direction on the outer peripheral surface of the head 24 on the opposite side in the radial direction with respect to the communication portion between the communication passage 320 and the annular passage 330. By this groove 29, a groove passage 332 is formed at a fitting portion between the seal member 40 and the head 24. The groove passage 332 communicates the annular passage 330 with the inside of the plug hole 3. With this passage configuration, the vent 312 communicates with the inside of the plug hole 3 through the water retention chamber 310, the communication passage 320, the annular passage 330, and the groove passage 332. Therefore, even if the gas in the plug hole 3 expands and contracts due to a change in the ambient temperature or water on the ignition coil 10 during operation of the internal combustion engine, the inside and the outside of the plug hole 3 can be vented.

保水室310を形成する通気部50の内周側面51の周囲には、保水室310の深さ方向に延びる4個の当接リブ56が形成されている。後述する封止部材60を通気部50に圧入するときに、4個の当接リブ56と前述した通路リブ52とが封止部材60と当接することにより、封止部材60が通気部50内の保水室310に落ち込むことを防止する。また、通路リブ52の開口周囲端面53に形成された溝54により溝通路322が形成されているので、開口周囲端面53に封止部材60が当接しても、保水室310と連通路320とは連通している。   Four contact ribs 56 extending in the depth direction of the water retention chamber 310 are formed around the inner peripheral side surface 51 of the ventilation portion 50 that forms the water retention chamber 310. When the sealing member 60 to be described later is press-fitted into the ventilation portion 50, the four contact ribs 56 and the above-described passage rib 52 come into contact with the sealing member 60, so that the sealing member 60 is in the ventilation portion 50. It is prevented from falling into the water holding chamber 310 of the water. Further, since the groove passage 322 is formed by the groove 54 formed in the opening peripheral end surface 53 of the passage rib 52, even if the sealing member 60 contacts the opening peripheral end surface 53, the water retention chamber 310, the communication passage 320, Are communicating.

封止部材60は、ゴム等の弾性材で、保水室310の断面形状に合わせて断面楕円形の柱状に形成されている。封止部材60は、柱状本体62と、柱状本体62の外周側面63の周方向に形成された環状突部64を、通気部50への圧入方向に複数設置している。封止部材60は、弾性変形することにより、保水室310と連通路320とが連通している側に開口している通気部50の連通側開口314の内周側面51に圧入されている。   The sealing member 60 is an elastic material such as rubber and is formed in a columnar shape having an elliptical cross section in accordance with the cross sectional shape of the water retention chamber 310. The sealing member 60 includes a plurality of columnar main bodies 62 and a plurality of annular protrusions 64 formed in the circumferential direction of the outer peripheral side surface 63 of the columnar main body 62 in the press-fitting direction into the ventilation portion 50. The sealing member 60 is press-fitted into the inner peripheral side surface 51 of the communication side opening 314 of the ventilation portion 50 that is open to the side where the water retention chamber 310 and the communication path 320 communicate with each other by elastic deformation.

以上説明した第1実施形態では、通気口312から保水室310、連通路320を通ってプラグホール3の内外を通気する通気通路の流体流れは、上端面2aに向けて開いた逆U字状になっている。この通路形状によると、通気口312から保水室310に水が侵入しても、水が保水室310を上昇して連通路320の開口周囲端面53に達しないと連通路320に流入しないので、連通路320への水の侵入、つまりプラグホール3への水の侵入を防止できる。さらに、通気口312から保水室310に水が侵入しても、保水室310の容積で水を保持できるので、保水室310から連通路320への水の侵入を防止できる。   In the first embodiment described above, the fluid flow in the ventilation passage that ventilates the inside and outside of the plug hole 3 from the ventilation port 312 through the water retention chamber 310 and the communication passage 320 is an inverted U-shape that opens toward the upper end surface 2a. It has become. According to this shape of the passage, even if water enters the water retention chamber 310 from the vent 312, the water does not flow into the communication passage 320 unless it rises in the water retention chamber 310 and reaches the opening peripheral end surface 53 of the communication passage 320. It is possible to prevent water from entering the communication path 320, that is, water from entering the plug hole 3. Furthermore, even if water enters the water retention chamber 310 from the vent 312, the water can be retained by the volume of the water retention chamber 310, so that the water can be prevented from entering the communication path 320 from the water retention chamber 310.

また、封止部材60の外周側面63に周方向に環状突部64が形成され、通気部50への圧入方向に複数の環状突部64が設置されているので、複数の環状突部64が弾性変形して通気部50の内周側面51に圧入されるときに、封止部材60の傾きを防止できる。さらに、通気部50の連通側開口314を封止部材60の環状突部64が二重にシールするので、通気部50のシール性が向上する。
また、保水室310と収容孔300とを仕切る隔壁28に通路リブ52が一体成形されているので、隔壁28の機械的強度が向上する。したがって、通気部50に封止部材60を圧入するときに、隔壁28の変形を防止できる。
Further, since the annular protrusion 64 is formed in the circumferential direction on the outer peripheral side surface 63 of the sealing member 60 and the plurality of annular protrusions 64 are installed in the press-fitting direction into the ventilation part 50, the plurality of annular protrusions 64 are The sealing member 60 can be prevented from tilting when being elastically deformed and press-fitted into the inner peripheral side surface 51 of the ventilation portion 50. Furthermore, since the annular protrusion 64 of the sealing member 60 double seals the communication side opening 314 of the ventilation portion 50, the sealing performance of the ventilation portion 50 is improved.
Further, since the passage rib 52 is integrally formed with the partition wall 28 that partitions the water retention chamber 310 and the accommodation hole 300, the mechanical strength of the partition wall 28 is improved. Therefore, the deformation of the partition wall 28 can be prevented when the sealing member 60 is press-fitted into the ventilation portion 50.

また、保水室310を形成する内周側面51に通路リブ52および複数の当接リブ56が形成されているので、内周側面51から保水室310の内側に突出している通路リブ52および複数の当接リブ56により、保水室310に侵入した水の撥ねが緩和される。したがって、保水室310に侵入した水が連通路320に侵入することを防止できる。
また、保水室310の底部の長手方向両端に通気口312が形成されているので、例えば車両が坂道走行して点火コイル10が傾斜したり、点火コイル10を傾斜して搭載する場合にも、長手方向両端に形成された通気口312の一方から保水室310に侵入した水が排出される。
Further, since the passage rib 52 and the plurality of contact ribs 56 are formed on the inner peripheral side surface 51 that forms the water retention chamber 310, the passage rib 52 and the plurality of passage ribs that protrude from the inner peripheral side surface 51 to the inside of the water retention chamber 310 are formed. Due to the abutment rib 56, the splash of water that has entered the water retention chamber 310 is reduced. Therefore, water that has entered the water retention chamber 310 can be prevented from entering the communication path 320.
In addition, since the vents 312 are formed at both ends in the longitudinal direction of the bottom of the water retention chamber 310, for example, when the vehicle runs on a slope and the ignition coil 10 is inclined or the ignition coil 10 is inclined and mounted, Water that has entered the water retention chamber 310 is discharged from one of the vents 312 formed at both ends in the longitudinal direction.

(第2〜第17実施形態)
本発明の第2〜第17実施形態を以下に説明する。尚、既述の実施形態と実質的に同一構成部分に同一符号を付す。
(第2実施形態)
図5に示す第2実施形態の封止部材70では、外周側面73に周方向に形成され、通気部50に取り付ける圧入方向に複数設置されている環状突部74は、突出方向に幅が狭くなっており、圧入方向と反対側に傾斜している。したがって、通気部50への圧入が容易であり、かつ圧入後に通気部50から脱落しにくい。
(Second to Seventeenth Embodiments)
Second to seventeenth embodiments of the present invention will be described below. In addition, the same code | symbol is attached | subjected to substantially the same component as embodiment mentioned above.
(Second Embodiment)
In the sealing member 70 according to the second embodiment shown in FIG. 5, the annular protrusions 74 formed in the circumferential direction on the outer peripheral side surface 73 and installed in the press-fitting direction attached to the ventilation part 50 are narrow in the protruding direction. It is inclined to the opposite side to the press-fitting direction. Therefore, press-fitting into the vent 50 is easy, and it is difficult for the vent 50 to fall off after press-fitting.

(第3実施形態)
図6に示す第3実施形態では、弾性変形して通気部50の内周側面51に圧入されている封止部材80の連通路320側の裏面82に、連通路320の開口周囲側方、つまり通路リブ52の側方に延びる断面半円形の壁84が形成されている。封止部材80の裏面82に水滴等が付着しても、壁84に遮られて水滴が連通路320の開口321に向かうことを防止できる。したがって、封止部材80の裏面82に付着した水滴が連通路320に侵入することを防止できる。
(Third embodiment)
In the third embodiment shown in FIG. 6, on the back surface 82 on the communication path 320 side of the sealing member 80 that is elastically deformed and press-fitted into the inner peripheral side surface 51 of the ventilation portion 50, That is, a wall 84 having a semicircular cross section extending to the side of the passage rib 52 is formed. Even if water droplets or the like adhere to the back surface 82 of the sealing member 80, it is possible to prevent the water droplets from being directed to the opening 321 of the communication path 320 by being blocked by the wall 84. Therefore, it is possible to prevent water droplets adhering to the back surface 82 of the sealing member 80 from entering the communication path 320.

(第4実施形態)
図7に示す第4実施形態では、カバー36の裏面36aに支持部としての突部90が形成されている。そして、封止部材70に形成された圧入穴92にカバー36の突部90が圧入されることにより、封止部材70がカバー36に支持されている。封止部材70がカバー36に支持された状態で、カバー36をコイルケース20のケース開口部26に取り付けることにより、封止部材70は通気部50の内周側面51に圧入される。このように、カバー36の組付工程で封止部材70を通気部50に圧入できるので、点火コイルの組付工数を低減できる。
(Fourth embodiment)
In the fourth embodiment shown in FIG. 7, a protrusion 90 as a support portion is formed on the back surface 36 a of the cover 36. The projecting portion 90 of the cover 36 is press-fitted into the press-fitting hole 92 formed in the sealing member 70, so that the sealing member 70 is supported by the cover 36. By attaching the cover 36 to the case opening 26 of the coil case 20 with the sealing member 70 supported by the cover 36, the sealing member 70 is press-fitted into the inner peripheral side surface 51 of the ventilation portion 50. Thus, since the sealing member 70 can be press-fitted into the ventilation portion 50 in the assembling process of the cover 36, the number of assembling steps of the ignition coil can be reduced.

(第5実施形態)
図8および図9に示す第5実施形態では、カバー36の外周縁は、ケース開口部26の外周縁よりも内側に位置している。さらに、カバー36の表面の角部37は凸曲面になっている。さらに、カバー36の高さをH、角部37からケース開口部26に向かう直線部38の長さをLとすると、H≦5mm、L≦2mmに設定されている。したがって、図9に示すように、指等でカバー36を引っ掛けることが困難であるから、コイルケース20からカバー36が容易に取り外されることを防止できる。
(Fifth embodiment)
In the fifth embodiment shown in FIGS. 8 and 9, the outer peripheral edge of the cover 36 is located inside the outer peripheral edge of the case opening 26. Furthermore, the corners 37 on the surface of the cover 36 are convex curved surfaces. Furthermore, when the height of the cover 36 is H and the length of the straight portion 38 from the corner portion 37 toward the case opening 26 is L, H ≦ 5 mm and L ≦ 2 mm are set. Therefore, as shown in FIG. 9, it is difficult to hook the cover 36 with a finger or the like, so that the cover 36 can be prevented from being easily removed from the coil case 20.

(第6実施形態)
図10に示す第6実施形態では、カバー36は頭部24に外側から嵌合している。頭部24とカバー36との嵌合部100、102は、階段状に形成されている。そして、カバー36の嵌合部102に、凹状にU字状の折り返し103が形成されている。この折り返し103により、頭部24とカバー36との嵌合隙間に侵入した水がコイルケース20内に侵入することを防止できる。
(Sixth embodiment)
In the sixth embodiment shown in FIG. 10, the cover 36 is fitted to the head 24 from the outside. The fitting portions 100 and 102 between the head 24 and the cover 36 are formed in a stepped shape. A concave U-shaped fold 103 is formed in the fitting portion 102 of the cover 36. By this folding 103, it is possible to prevent water that has entered the fitting gap between the head 24 and the cover 36 from entering the coil case 20.

(第7実施形態)
図11に示す第7実施形態では、カバー36は頭部24に外側から嵌合している。そして、頭部24とカバー36との嵌合箇所の周方向の少なくとも一箇所に、水抜き通路340が形成されている。したがって、頭部24とカバー36との嵌合隙間に侵入した水を水抜き通路340から点火コイルの外部に排出できる。
(Seventh embodiment)
In the seventh embodiment shown in FIG. 11, the cover 36 is fitted to the head 24 from the outside. A drainage passage 340 is formed in at least one place in the circumferential direction of the fitting place between the head 24 and the cover 36. Therefore, the water that has entered the fitting gap between the head 24 and the cover 36 can be discharged from the drain passage 340 to the outside of the ignition coil.

(第8、第9実施形態)
図12に示す第8実施形態、および図13に示す第9実施形態では、点火コイル10は、天地方向に対して傾斜してシリンダヘッド2に取り付けられている。そして、傾斜している点火コイル10の頭部24とカバー36との嵌合箇所の下方側に水抜き通路340が形成されている。したがって、頭部24とカバー36との嵌合隙間に侵入した水が、嵌合箇所の下方側に形成された水抜き通路340に集まり、水抜き通路340から点火コイルの外部に排出される。水抜き通路340は、頭部24またはカバー36、あるいは頭部24およびカバー36の両方に形成してもよい。
さらに、図13に示す第9実施形態では、カバー36の裏面36aに、水抜き通路340に向かう案内リブ110が形成されている。したがって、カバー36の裏面に付着した水滴は案内リブ110に案内されて水抜き通路に340に集まり、水抜き通路340から点火コイルの外部に排出される。
(Eighth and ninth embodiments)
In the eighth embodiment shown in FIG. 12 and the ninth embodiment shown in FIG. 13, the ignition coil 10 is attached to the cylinder head 2 so as to be inclined with respect to the vertical direction. A drain passage 340 is formed below the fitting portion between the head portion 24 of the ignition coil 10 and the cover 36 that are inclined. Therefore, the water that has entered the fitting gap between the head 24 and the cover 36 gathers in the drainage passage 340 formed on the lower side of the fitting portion, and is discharged from the drainage passage 340 to the outside of the ignition coil. The drain passage 340 may be formed in the head 24 or the cover 36, or both the head 24 and the cover 36.
Furthermore, in the ninth embodiment shown in FIG. 13, a guide rib 110 is formed on the back surface 36 a of the cover 36 toward the drainage passage 340. Accordingly, the water droplets adhering to the back surface of the cover 36 are guided by the guide rib 110 and gather in the drain passage 340 and are discharged from the drain passage 340 to the outside of the ignition coil.

(第10実施形態)
図14に示す第10実施形態では、頭部24のケース開口部26の四隅から、嵌合突部120がカバー36側に突出している。カバー36の嵌合突部120と対応する位置には、嵌合突部120が嵌合する嵌合穴122が形成されている。そして、嵌合穴122に嵌合突部120を嵌合させた後に、嵌合突部120を超音波または熱によりかしめることにより、頭部24にカバー36を強固に固定できる。
(10th Embodiment)
In 10th Embodiment shown in FIG. 14, the fitting protrusion 120 protrudes from the four corners of the case opening part 26 of the head 24 to the cover 36 side. A fitting hole 122 into which the fitting protrusion 120 is fitted is formed at a position corresponding to the fitting protrusion 120 of the cover 36. Then, after fitting the fitting protrusion 120 into the fitting hole 122, the cover 36 can be firmly fixed to the head 24 by caulking the fitting protrusion 120 with ultrasonic waves or heat.

(第11実施形態)
図15に示す第11実施形態では、保水室310の底部の長手方向両端に形成された通気口312と、保水室310と連通している連通路320の開口321とは、互いの距離をほぼ等しく、極力離れた最大離隔位置になるように配置されている。したがって、通気口312から保水室310に侵入した水が連通路320に侵入することを防止できる。
(Eleventh embodiment)
In the eleventh embodiment shown in FIG. 15, the vents 312 formed at both ends in the longitudinal direction of the bottom of the water retention chamber 310 and the openings 321 of the communication passage 320 communicating with the water retention chamber 310 are approximately the same distance from each other. It is equally arranged so as to be a maximum separated position as far as possible. Therefore, water that has entered the water retention chamber 310 from the vent 312 can be prevented from entering the communication path 320.

(第12実施形態)
図16に示す第12実施形態では、保水室310の底部の長手方向の一端に形成された通気口312と、保水室310と連通している連通路320の開口321とは、極力離れた最大離隔位置になるように配置されている。したがって、通気口312から保水室310に侵入した水が連通路320に侵入することを防止できる。
(Twelfth embodiment)
In the twelfth embodiment shown in FIG. 16, the vent 312 formed at one end in the longitudinal direction of the bottom of the water retention chamber 310 and the opening 321 of the communication passage 320 communicating with the water retention chamber 310 are separated as much as possible. It arrange | positions so that it may become a separation position. Therefore, water that has entered the water retention chamber 310 from the vent 312 can be prevented from entering the communication path 320.

(第13実施形態)
図17に示す第13実施形態では、保水室310に、編目状の充填材130が充填されている。この構成によれば、網目状の充填材130が保水室310に侵入した水の撥ねを低減する。したがって、保水室310に侵入した水が保水室310から連通路320に侵入することを防止できる。網状の充填材130に代えて、多孔質の充填材を保水室310に充填してもよい。
(13th Embodiment)
In the thirteenth embodiment shown in FIG. 17, the water retention chamber 310 is filled with a knitted filler 130. According to this configuration, the splash of water that the mesh-like filler 130 has entered the water retention chamber 310 is reduced. Therefore, water that has entered the water retention chamber 310 can be prevented from entering the communication path 320 from the water retention chamber 310. Instead of the net-like filler 130, the water retention chamber 310 may be filled with a porous filler.

(第14実施形態)
図18に示す第14実施形態では、コイルケース20を樹脂成形するときに、例えば通気口312を成型する上下の型の位置をずらすことにより、通気口312を折れ曲がった迷路構造にしている。このように、通気口312を迷路構造にすることにより、通気口312から保水室310に水が侵入することを妨げることができる。
(14th Embodiment)
In the fourteenth embodiment shown in FIG. 18, when the coil case 20 is resin-molded, for example, the position of the upper and lower molds for molding the vent 312 is shifted to form a bent labyrinth structure. Thus, by making the vent hole 312 have a labyrinth structure, it is possible to prevent water from entering the water holding chamber 310 from the vent hole 312.

(第15実施形態)
図19に示す第15実施形態では、通気部50からシリンダヘッド2の上端面2aに向けて下方に突出する突部140に通気口312が形成されている。このように突部140に通気口312を形成することにより、通気口312の開口周囲の面積が小さくなる。したがって、通気口312の開口周囲の面に沿って通気口312に水が侵入することを妨げることができる。
(Fifteenth embodiment)
In the fifteenth embodiment shown in FIG. 19, the vent 312 is formed in the protrusion 140 that protrudes downward from the vent 50 toward the upper end surface 2 a of the cylinder head 2. By forming the vent 312 in the protrusion 140 in this way, the area around the opening of the vent 312 is reduced. Therefore, it is possible to prevent water from entering the vent 312 along the surface around the opening of the vent 312.

(第16実施形態)
図20に示す第16実施形態では、樹脂製の板状の封止部材150が通気部50の内周側面51に挿入され、接着剤152により封止部材150と通気部50とが接着されている。したがって、簡単な板形状の封止部材150を使用できる。
(Sixteenth embodiment)
In the sixteenth embodiment shown in FIG. 20, a resin plate-like sealing member 150 is inserted into the inner peripheral side surface 51 of the ventilation portion 50, and the sealing member 150 and the ventilation portion 50 are bonded by an adhesive 152. Yes. Therefore, a simple plate-shaped sealing member 150 can be used.

(第17実施形態)
図21に示す第17実施形態では、樹脂製の板状の封止部材160が通気部50の内周側面51に挿入され、絶縁樹脂材であるエポキシ樹脂34が封止部材160と通気部50とを固定している。収容孔300に充填されるエポキシ樹脂34は、隔壁28に形成された溝162を通って保水室310に流入し、封止部材160と通気部50とを固定している。このように、収容孔300に充填されるエポキシ樹脂34で通気部50に封止部材160を固定するので、エポキシ樹脂34の充填工程と封止部材160の固定工程とを兼ねることができる。したがって、点火コイルの製造工数を低減できる。
(17th Embodiment)
In the seventeenth embodiment shown in FIG. 21, a resin plate-like sealing member 160 is inserted into the inner peripheral side surface 51 of the ventilation portion 50, and the epoxy resin 34 that is an insulating resin material is used for the sealing member 160 and the ventilation portion 50. And are fixed. The epoxy resin 34 filled in the accommodation hole 300 flows into the water retention chamber 310 through the groove 162 formed in the partition wall 28, and fixes the sealing member 160 and the ventilation portion 50. Thus, since the sealing member 160 is fixed to the ventilation part 50 with the epoxy resin 34 with which the accommodation hole 300 is filled, the filling process of the epoxy resin 34 and the fixing process of the sealing member 160 can be combined. Therefore, the number of manufacturing steps of the ignition coil can be reduced.

(第18実施形態)
図22に示す第18実施形態では、超音波による熱溶着により、封止部材としての樹脂シート180を通気部50に固定している。熱溶着する代わりに、樹脂シート180の通気部50側に融着材をラミネートし、融着材を熱融着することにより樹脂シート180を通気部に固定してもよい。
(Eighteenth embodiment)
In 18th Embodiment shown in FIG. 22, the resin sheet 180 as a sealing member is being fixed to the ventilation part 50 by the heat welding by an ultrasonic wave. Instead of heat welding, the resin sheet 180 may be fixed to the ventilation portion by laminating a fusion material on the ventilation portion 50 side of the resin sheet 180 and thermally fusing the fusion material.

(他の実施形態)
以上説明した上記実施形態では、コイル部30が円筒状の点火コイルについて説明したが、本発明では、コイル部が矩形であってもよい。
また、第1、第2実施形態において、通気部50の連通側開口314が封止部材で塞がれているのであれば、封止部材に環状突部を設けていない構成でもよい。また、環状突部64、74を形成した封止部材60、70が弾性変形して通気部50の連通側開口314を塞いでいるのであれば、保水室310を形成する通気部50の内周側面51に当接リブ56を形成せず、かつ通路リブ52が封止部材60、70と当接しない構成でもよい。
(Other embodiments)
In the embodiment described above, the coil portion 30 has been described as a cylindrical ignition coil. However, in the present invention, the coil portion may be rectangular.
In the first and second embodiments, as long as the communication side opening 314 of the ventilation portion 50 is closed by the sealing member, the sealing member may not be provided with the annular protrusion. Further, if the sealing members 60 and 70 that form the annular protrusions 64 and 74 are elastically deformed to block the communication side opening 314 of the ventilation part 50, the inner periphery of the ventilation part 50 that forms the water retention chamber 310. A configuration in which the contact rib 56 is not formed on the side surface 51 and the passage rib 52 does not contact the sealing members 60 and 70 may be employed.

また、第1実施形態では、通気口312は、保水室310の長手方向両端ではなく、一端側に形成してもよい。また、連通路320は、収容孔300と保水室310とを仕切る隔壁28と一体成形した通路リブ52に形成する必要はなく、例えば図3に示す4個の当接リブ56のいずれかの位置に形成してもよいし、通気部50の内周側面51から保水室310の内側に離れた位置に形成してもよい。   In the first embodiment, the vent 312 may be formed at one end rather than at both ends in the longitudinal direction of the water retention chamber 310. Further, the communication passage 320 does not need to be formed in the passage rib 52 integrally formed with the partition wall 28 that partitions the accommodation hole 300 and the water retention chamber 310. For example, the position of one of the four contact ribs 56 shown in FIG. Alternatively, it may be formed at a position away from the inner peripheral side surface 51 of the ventilation portion 50 to the inside of the water retention chamber 310.

第11〜第13実施形態では、通気部50に封止部材60を圧入して通気部50を塞いでいるが、通気部50が塞がれているのであれば、封止部材60以外の封止部材で通気部50を塞いでもよい。
このように、本発明は、上記複数の実施形態に限定されるものではなく、その要旨を逸脱しない範囲で種々の実施形態に適用可能である。
In the 11th to 13th embodiments, the sealing member 60 is press-fitted into the ventilation portion 50 to block the ventilation portion 50. However, if the ventilation portion 50 is blocked, sealing other than the sealing member 60 is performed. The ventilation part 50 may be closed with a stop member.
As described above, the present invention is not limited to the above-described plurality of embodiments, and can be applied to various embodiments without departing from the gist thereof.

本発明の第1実施形態による点火コイルを示す断面図。Sectional drawing which shows the ignition coil by 1st Embodiment of this invention. 第1実施形態の封止部材を示す断面図。Sectional drawing which shows the sealing member of 1st Embodiment. 保水室を上方から見た模式図。The schematic diagram which looked at the water retention chamber from the upper part. 図3のIV−IV線断面斜視図。FIG. 4 is a cross-sectional perspective view taken along line IV-IV in FIG. 3. 第2実施形態の封止部材を示す断面図。Sectional drawing which shows the sealing member of 2nd Embodiment. 第3実施形態の封止部材を示す断面図。Sectional drawing which shows the sealing member of 3rd Embodiment. 第4実施形態のカバーによる封止部材の支持構造を示す断面図。Sectional drawing which shows the support structure of the sealing member by the cover of 4th Embodiment. 第5実施形態のカバーの構造を示す説明図。Explanatory drawing which shows the structure of the cover of 5th Embodiment. 第5実施形態のカバーの構造を示す説明図。Explanatory drawing which shows the structure of the cover of 5th Embodiment. 第6実施形態のカバーとコイルケースとの嵌合構造を示す断面図。Sectional drawing which shows the fitting structure of the cover and coil case of 6th Embodiment. 第7実施形態のカバーとコイルケースとの嵌合構造を示す断面図。Sectional drawing which shows the fitting structure of the cover and coil case of 7th Embodiment. 第8実施形態のカバーとコイルケースとの嵌合箇所に形成された水抜き通路を示す説明図。Explanatory drawing which shows the drainage channel | path formed in the fitting location of the cover and coil case of 8th Embodiment. 第9実施形態のカバーの裏面構造を示す説明図。Explanatory drawing which shows the back surface structure of the cover of 9th Embodiment. 第10実施形態のカバーとコイルケースとの取付構造を示す説明図。Explanatory drawing which shows the attachment structure of the cover and coil case of 10th Embodiment. 第11実施形態の通気口と連通路との位置関係を示す断面図。Sectional drawing which shows the positional relationship of the vent hole and communicating path of 11th Embodiment. 第12実施形態の通気口と連通路との位置関係を示す断面図。Sectional drawing which shows the positional relationship of the vent hole and communicating path of 12th Embodiment. 第13実施形態の保水室に充填された充填材を示す断面図。Sectional drawing which shows the filler with which the water retention chamber of 13th Embodiment was filled. 第14実施形態の通気口の迷路構造を示す断面図。Sectional drawing which shows the labyrinth structure of the vent hole of 14th Embodiment. 第15実施形態の通気口の構造を示す断面図。Sectional drawing which shows the structure of the vent hole of 15th Embodiment. 第16実施形態の封止部材の取付構造を示す断面図。Sectional drawing which shows the attachment structure of the sealing member of 16th Embodiment. 第17実施形態の封止部材の取付構造を示す断面図。Sectional drawing which shows the attachment structure of the sealing member of 17th Embodiment. 第18実施形態の封止部材の取付構造を示す断面図。Sectional drawing which shows the attachment structure of the sealing member of 18th Embodiment.

符号の説明Explanation of symbols

2:シリンダヘッド、3:プラグホール、10:点火コイル、20:コイルケース(ケース部材)、24:頭部、26:ケース開口部、28:隔壁、36:カバー、36a:裏面、37:角部、38:直線部、40:シール部材、50:通気部、51:内周側面、52:通路リブ、53:開口周囲端面、54:溝、56:当接リブ、60、70、80、150、160:封止部材、64、74:環状突部、82:裏面、84:壁、90:突部(支持部)、103:折り返し、110:案内リブ、120:嵌合突部、122:嵌合穴、130:充填材、140:突部、152:接着剤、180:樹脂シート(封止部材)、300:収容孔、310:保水室、312:通気口、314:連通側開口、320:連通路、321:開口、322:溝通路、340:水抜き通路 2: cylinder head, 3: plug hole, 10: ignition coil, 20: coil case (case member), 24: head, 26: case opening, 28: partition, 36: cover, 36a: back surface, 37: corner Part: 38: straight part, 40: sealing member, 50: ventilation part, 51: inner peripheral side surface, 52: passage rib, 53: opening peripheral end face, 54: groove, 56: contact rib, 60, 70, 80, 150, 160: sealing member, 64, 74: annular projection, 82: back surface, 84: wall, 90: projection (support), 103: folding, 110: guide rib, 120: fitting projection, 122 : Fitting hole, 130: filler, 140: protrusion, 152: adhesive, 180: resin sheet (sealing member), 300: accommodation hole, 310: water retention chamber, 312: vent, 314: communication side opening 320: communication path, 321: opening, 322: groove passage , 340: water drain passage

Claims (32)

点火プラグとの結合側が内燃機関のプラグホールに挿入される点火コイルにおいて、
前記点火プラグに印加する高電圧を発生するコイル部と、
前記コイル部を収容し、前記プラグホールの外側で前記内燃機関に取り付けられるケース部材と、
前記ケース部材と前記内燃機関との間に取り付けられ、前記プラグホール内への水の侵入を防止するシール部材と、
前記ケース部材に設けられており、通気口を通して前記点火コイルの外部と連通し前記プラグホールの開口周囲の上端面から離れる上方に前記通気口側から延びている保水室、ならびに、前記上端面から前記通気口よりも離れる方向の前記保水室の上方端部と前記プラグホール側とを連通する連通路を有している通気部と、
弾性材で形成されており、前記保水室と前記連通路とが連通している側に開口している前記通気部の連通側開口の内周側面に圧入されて前記連通側開口を塞ぎ、前記内周側面に向けて突出する環状突部を外周側面の周方向に形成し、前記通気部への圧入方向に前記環状突部を複数設置している封止部材と、
を備える点火コイル。
In the ignition coil in which the coupling side with the spark plug is inserted into the plug hole of the internal combustion engine,
A coil section for generating a high voltage to be applied to the spark plug;
A case member that houses the coil portion and is attached to the internal combustion engine outside the plug hole;
A seal member attached between the case member and the internal combustion engine to prevent water from entering the plug hole;
A water retaining chamber provided in the case member, communicated with the outside of the ignition coil through the vent and extending from the vent side upward from the upper end surface around the opening of the plug hole; and from the upper end surface A ventilation portion having a communication path communicating the upper end portion of the water retention chamber in a direction away from the ventilation port and the plug hole side;
It is formed of an elastic material, and is press-fitted into an inner peripheral side surface of the communication side opening of the ventilation portion that is open on the side where the water retention chamber and the communication path are in communication with each other. A sealing member in which an annular protrusion protruding toward the inner peripheral side surface is formed in the circumferential direction of the outer peripheral side surface, and a plurality of the annular protrusions are installed in the press-fitting direction into the ventilation portion;
An ignition coil comprising:
前記環状突部の幅は突出方向に向けて狭くなっており、前記環状突部は前記通気部への圧入方向と反対側に傾斜している請求項1に記載の点火コイル。   2. The ignition coil according to claim 1, wherein a width of the annular protrusion is narrowed in a protruding direction, and the annular protrusion is inclined to a side opposite to a press-fitting direction into the ventilation portion. 前記保水室を形成する前記通気部の内周側面に形成され、前記通気部への前記封止部材の圧入方向で前記封止部材と当接する当接リブを備える請求項1または2に記載の点火コイル。   The contact rib which is formed in the inner peripheral side surface of the said ventilation part which forms the said water retention chamber, and contact | abuts the said sealing member in the press injection direction of the said sealing member to the said ventilation part is provided. Ignition coil. 前記コイル部を収容する前記ケース部材の収容孔と前記保水室とを仕切る隔壁に一体に形成されている通路リブに前記連通路は形成されている請求項1から3のいずれか一項に記載の点火コイル。   4. The communication passage according to claim 1, wherein the communication passage is formed in a passage rib formed integrally with a partition wall that partitions the housing hole of the case member that houses the coil portion and the water retention chamber. 5. Ignition coil. 前記保水室と連通している前記連通路の開口周囲端面は前記通気部への前記封止部材の圧入方向で前記封止部材と当接し、前記開口周囲端面に前記保水室と連通する溝通路が形成されている請求項1から4のいずれか一項に記載の点火コイル。   An opening peripheral end surface of the communication passage communicating with the water retention chamber abuts on the sealing member in the press-fitting direction of the sealing member into the ventilation portion, and a groove passage communicating with the water retention chamber on the opening peripheral end surface The ignition coil as described in any one of Claim 1 to 4 in which is formed. 点火プラグとの結合側が内燃機関のプラグホールに挿入される点火コイルにおいて、
前記点火プラグに印加する高電圧を発生するコイル部と、
前記コイル部を収容し、前記プラグホールの外側で前記内燃機関に取り付けられるケース部材と、
前記ケース部材と前記内燃機関との間に取り付けられ、前記プラグホール内への水の侵入を防止するシール部材と、
前記ケース部材に設けられており、通気口を通して前記点火コイルの外部と連通し前記プラグホールの開口周囲の上端面から離れる上方に前記通気口側から延びている保水室、ならびに、前記上端面から前記通気口よりも離れる方向の前記保水室の上方端部と前記プラグホール側とを連通する連通路を有している通気部と、
前記保水室と前記連通路とが連通している側に開口している前記通気部の連通側開口を塞ぐ封止部材と、
前記封止部材と前記通気部とを接着している接着剤と、
を備える点火コイル。
In the ignition coil in which the coupling side with the spark plug is inserted into the plug hole of the internal combustion engine,
A coil section for generating a high voltage to be applied to the spark plug;
A case member that houses the coil portion and is attached to the internal combustion engine outside the plug hole;
A seal member attached between the case member and the internal combustion engine to prevent water from entering the plug hole;
A water retaining chamber provided in the case member, communicated with the outside of the ignition coil through the vent and extending from the vent side upward from the upper end surface around the opening of the plug hole; and from the upper end surface A ventilation portion having a communication path communicating the upper end portion of the water retention chamber in a direction away from the ventilation port and the plug hole side;
A sealing member that closes the communication side opening of the ventilation portion that is open to the side where the water retention chamber and the communication path communicate with each other;
An adhesive bonding the sealing member and the ventilation portion;
An ignition coil comprising:
点火プラグとの結合側が内燃機関のプラグホールに挿入される点火コイルにおいて、
前記点火プラグに印加する高電圧を発生するコイル部と、
前記コイル部を収容し、前記プラグホールの外側で前記内燃機関に取り付けられるケース部材と、
前記ケース部材と前記内燃機関との間に取り付けられ、前記プラグホール内への水の侵入を防止するシール部材と、
前記ケース部材に設けられており、通気口を通して前記点火コイルの外部と連通し前記プラグホールの開口周囲の上端面から離れる上方に前記通気口側から延びている保水室、ならびに、前記上端面から前記通気口よりも離れる方向の前記保水室の上方端部と前記プラグホール側とを連通する連通路を有している通気部と、
前記保水室と前記連通路とが連通している側に開口している前記通気部の連通側開口を塞ぐ封止部材と、
前記ケース部材内に充填されて前記コイル部を覆うとともに、前記通気部に前記封止部材を固定する絶縁樹脂材と、
を備える点火コイル。
In the ignition coil in which the coupling side with the spark plug is inserted into the plug hole of the internal combustion engine,
A coil section for generating a high voltage to be applied to the spark plug;
A case member that houses the coil portion and is attached to the internal combustion engine outside the plug hole;
A seal member attached between the case member and the internal combustion engine to prevent water from entering the plug hole;
A water retaining chamber provided in the case member, communicated with the outside of the ignition coil through the vent and extending from the vent side upward from the upper end surface around the opening of the plug hole; and from the upper end surface A ventilation portion having a communication path communicating the upper end portion of the water retention chamber in a direction away from the ventilation port and the plug hole side;
A sealing member that closes the communication side opening of the ventilation portion that is open to the side where the water retention chamber and the communication path communicate with each other;
An insulating resin material that fills the case member and covers the coil portion, and fixes the sealing member to the ventilation portion;
An ignition coil comprising:
前記封止部材の前記連通路と向き合う裏面に、前記保水室と連通している前記連通路の開口周囲側方に延びる壁が形成されている請求項1から7のいずれか一項に記載の点火コイル。   8. The wall according to claim 1, wherein a wall is formed on a back surface of the sealing member that faces the communication path, and a wall extending laterally around the opening of the communication path that communicates with the water retention chamber. Ignition coil. 点火プラグとの結合側が内燃機関のプラグホールに挿入される点火コイルにおいて、
前記点火プラグに印加する高電圧を発生するコイル部と、
前記コイル部を収容し、前記プラグホールの外側で前記内燃機関に取り付けられるケース部材と、
前記ケース部材と前記内燃機関との間に取り付けられ、前記プラグホール内への水の侵入を防止するシール部材と、
前記ケース部材に設けられており、通気口を通して前記点火コイルの外部と連通し前記プラグホールの開口周囲の上端面から離れる上方に前記通気口側から延びている保水室、ならびに、前記上端面から前記通気口よりも離れる方向の前記保水室の上方端部と前記プラグホール側とを連通する連通路を有している通気部と、
樹脂シートで形成されて熱溶着により前記通気部に取り付けられ、前記保水室と前記連通路とが連通している側に開口している前記通気部の連通側開口を塞ぐ封止部材と、
を備える点火コイル。
In the ignition coil in which the coupling side with the spark plug is inserted into the plug hole of the internal combustion engine,
A coil section for generating a high voltage to be applied to the spark plug;
A case member that houses the coil portion and is attached to the internal combustion engine outside the plug hole;
A seal member attached between the case member and the internal combustion engine to prevent water from entering the plug hole;
A water retaining chamber provided in the case member, communicated with the outside of the ignition coil through the vent and extending from the vent side upward from the upper end surface around the opening of the plug hole; and from the upper end surface A ventilation portion having a communication path communicating the upper end portion of the water retention chamber in a direction away from the ventilation port and the plug hole side;
A sealing member that is formed of a resin sheet and is attached to the ventilation part by thermal welding, and that closes the communication side opening of the ventilation part that is open to the side where the water retention chamber and the communication path communicate with each other;
An ignition coil comprising:
点火プラグとの結合側が内燃機関のプラグホールに挿入される点火コイルにおいて、
前記点火プラグに印加する高電圧を発生するコイル部と、
前記コイル部を収容し、前記プラグホールの外側で前記内燃機関に取り付けられるケース部材と、
前記ケース部材と前記内燃機関との間に取り付けられ、前記プラグホール内への水の侵入を防止するシール部材と、
前記ケース部材に設けられており、通気口を通して前記点火コイルの外部と連通し前記プラグホールの開口周囲の上端面から離れる上方に前記通気口側から延びている保水室、ならびに、前記上端面から前記通気口よりも離れる方向の前記保水室の上方端部と前記プラグホール側とを連通する連通路を有している通気部と、
樹脂シートで形成されて前記通気部との取付側にラミネートされた融着材により前記通気部に熱融着されており、前記保水室と前記連通路とが連通している側に開口している前記通気部の連通側開口を塞ぐ封止部材と、
を備える点火コイル。
In the ignition coil in which the coupling side with the spark plug is inserted into the plug hole of the internal combustion engine,
A coil section for generating a high voltage to be applied to the spark plug;
A case member that houses the coil portion and is attached to the internal combustion engine outside the plug hole;
A seal member attached between the case member and the internal combustion engine to prevent water from entering the plug hole;
A water retaining chamber provided in the case member, communicated with the outside of the ignition coil through the vent and extending from the vent side upward from the upper end surface around the opening of the plug hole; and from the upper end surface A ventilation portion having a communication path communicating the upper end portion of the water retention chamber in a direction away from the ventilation port and the plug hole side;
It is heat-sealed to the ventilation portion by a fusion material formed of a resin sheet and laminated on the attachment side with the ventilation portion, and is opened to the side where the water retention chamber and the communication path communicate with each other. A sealing member that closes the communication side opening of the ventilation part,
An ignition coil comprising:
前記封止部材の色は前記コイルケースの色と異なっている請求項1から10に記載の点火コイル。   The ignition coil according to claim 1, wherein a color of the sealing member is different from a color of the coil case. 前記プラグホールの外部に開口する前記ケース部材のケース開口部よび前記封止部材を覆うカバーをさらに備え、前記カバーの前記保水室側の裏面に前記封止部材の支持部を設け、前記封止部材は前記支持部に支持された状態で前記通気部の前記連通側開口を塞いでいる請求項1から5に記載の点火コイル。   A cover that covers the case opening of the case member that opens to the outside of the plug hole and the sealing member; and a support portion for the sealing member is provided on the back surface of the cover on the water retention chamber side. The ignition coil according to claim 1, wherein the member closes the communication side opening of the ventilation portion in a state of being supported by the support portion. 前記プラグホールの外部に開口する前記ケース部材のケース開口部および前記封止部材を覆うカバーをさらに備える請求項1から11のいずれか一項に記載の点火コイル。   The ignition coil according to any one of claims 1 to 11, further comprising a cover that covers a case opening of the case member that opens to the outside of the plug hole and the sealing member. 前記カバーの外周縁は前記ケース開口部の外周縁よりも内側に位置し、前記カバーの表面の角部は凸曲面であり、前記カバーの高さをH、前記凸曲面から前記ケース開口部に延びる直線部の長さをLとすると、H≦5mm、L≦2mmである請求項12または13に記載の点火コイル。   The outer peripheral edge of the cover is located on the inner side of the outer peripheral edge of the case opening, the corner of the surface of the cover is a convex curved surface, the height of the cover is H, and the height of the cover is changed from the convex curved surface to the case opening. 14. The ignition coil according to claim 12, wherein H ≦ 5 mm and L ≦ 2 mm, where L is a length of the extending linear portion. 前記カバーは前記ケース部材に外側から複数の階段状に嵌合しており、前記カバーの前記ケース部材との階段状の嵌合箇所に、前記ケース部材内への水の進入を防ぐU字状の折り返しが形成されている請求項12から14のいずれか一項に記載の点火コイル。   The cover is fitted into the case member in a plurality of steps from the outside, and a U-shape that prevents water from entering the case member at the stepped fitting portion of the cover with the case member The ignition coil according to any one of claims 12 to 14, wherein a turn-up is formed. 前記カバーは前記ケース部材に外側から嵌合しており、前記嵌合箇所の周方向の少なくとも一箇所に水抜き通路が形成されている請求項12から15のいずれか一項に記載の点火コイル。   The ignition coil according to any one of claims 12 to 15, wherein the cover is fitted to the case member from the outside, and a drainage passage is formed in at least one place in the circumferential direction of the fitting place. . 前記内燃機関に搭載した状態で、前記嵌合箇所の下方側に前記水抜き通路が形成されている請求項16に記載の点火コイル。   The ignition coil according to claim 16, wherein the drainage passage is formed on a lower side of the fitting portion in a state of being mounted on the internal combustion engine. 前記カバーの裏面に前記水抜き通路に向かう案内リブを形成している請求項17に記載の点火コイル。   The ignition coil according to claim 17, wherein a guide rib toward the drain passage is formed on a back surface of the cover. 前記ケース開口部に前記カバーに向けて突出する嵌合突部が形成され、前記カバーに前記嵌合突部が嵌合する嵌合穴が形成されており、前記嵌合穴に前記嵌合突部が嵌合した状態で前記嵌合突部がかしめられ、前記カバーが前記ケース部材に取り付けられている請求項12から18のいずれか一項に記載の点火コイル。   A fitting protrusion that protrudes toward the cover is formed in the case opening, and a fitting hole for fitting the fitting protrusion is formed in the cover, and the fitting protrusion is formed in the fitting hole. The ignition coil according to any one of claims 12 to 18, wherein the fitting protrusion is caulked in a state in which the portion is fitted, and the cover is attached to the case member. 前記カバーの色は前記ケース部材の色と異なっている請求項12から19のいずれか一項に記載の点火コイル。   The ignition coil according to any one of claims 12 to 19, wherein a color of the cover is different from a color of the case member. 前記通気口は、前記保水室の底部の長手方向両端に形成されている請求項1から20のいずれか一項に記載の点火コイル。   The ignition coil according to any one of claims 1 to 20, wherein the vent hole is formed at both longitudinal ends of the bottom of the water retention chamber. 前記保水室と連通している前記連通路の開口と前記通気口とは、ほぼ最大離隔位置に配置されている請求項1から21のいずれか一項に記載の点火コイル。   The ignition coil according to any one of claims 1 to 21, wherein the opening of the communication passage communicating with the water retention chamber and the vent are disposed at a substantially maximum separated position. 前記通気口は、迷路構造になっている請求項1から22のいずれか一項に記載の点火コイル。   The ignition coil according to any one of claims 1 to 22, wherein the vent has a labyrinth structure. 前記通気部から前記プラグホールの開口周囲の前記上端面に向けて下方に突出する突部に前記通気口は開口している請求項1から23のいずれか一項に記載の点火コイル。   The ignition coil according to any one of claims 1 to 23, wherein the vent hole is open to a protrusion projecting downward from the vent portion toward the upper end surface around the opening of the plug hole. 前記保水室に充填されている多孔質または網目状の充填材をさらに備える請求項1から24のいずれか一項に記載の点火コイル。   The ignition coil according to any one of claims 1 to 24, further comprising a porous or mesh-like filler filled in the water retention chamber. 点火プラグとの結合側が内燃機関のプラグホールに挿入される点火コイルにおいて、
前記点火プラグに印加する高電圧を発生するコイル部と、
前記コイル部を収容し、前記プラグホールの外側で前記内燃機関に取り付けられるケース部材と、
前記ケース部材と前記内燃機関との間に取り付けられ、前記プラグホール内への水の侵入を防止するシール部材と、
前記ケース部材に設けられており、通気口を通して前記点火コイルの外部と連通し前記プラグホールの開口周囲の上端面から離れる上方に前記通気口側から延びている保水室、ならびに、前記上端面から前記通気口よりも離れる方向の前記保水室の上方端部と前記プラグホール側とを連通する連通路を有し、前記通気口は前記保水室の底部の長手方向両端に形成されており、前記保水室と前記連通路とが連通している側が塞がれている通気部と、
を備える点火コイル。
In the ignition coil in which the coupling side with the spark plug is inserted into the plug hole of the internal combustion engine,
A coil section for generating a high voltage to be applied to the spark plug;
A case member that houses the coil portion and is attached to the internal combustion engine outside the plug hole;
A seal member attached between the case member and the internal combustion engine to prevent water from entering the plug hole;
A water retaining chamber provided in the case member, communicated with the outside of the ignition coil through the vent and extending from the vent side upward from the upper end surface around the opening of the plug hole; and from the upper end surface A communication passage that communicates the upper end of the water retention chamber in a direction away from the vent and the plug hole side, and the vent is formed at both longitudinal ends of the bottom of the water retention chamber; A ventilation part in which the side where the water retention chamber communicates with the communication path is blocked;
An ignition coil comprising:
点火プラグとの結合側が内燃機関のプラグホールに挿入される点火コイルにおいて、
前記点火プラグに印加する高電圧を発生するコイル部と、
前記コイル部を収容し、前記プラグホールの外側で前記内燃機関に取り付けられるケース部材と、
前記ケース部材と前記内燃機関との間に取り付けられ、前記プラグホール内への水の侵入を防止するシール部材と、
前記ケース部材に設けられており、通気口を通して前記点火コイルの外部と連通し前記プラグホールの開口周囲の上端面から離れる上方に前記通気口側から延びている保水室、ならびに、前記上端面から前記通気口よりも離れる方向の前記保水室の上方端部と前記プラグホール側とを連通する連通路を有し、前記保水室と連通している前記連通路の開口と前記通気口とはほぼ最大離隔位置に配置されており、前記保水室と前記連通路とが連通している側が塞がれている通気部と、
を備える点火コイル。
In the ignition coil in which the coupling side with the spark plug is inserted into the plug hole of the internal combustion engine,
A coil section for generating a high voltage to be applied to the spark plug;
A case member that houses the coil portion and is attached to the internal combustion engine outside the plug hole;
A seal member attached between the case member and the internal combustion engine to prevent water from entering the plug hole;
A water retaining chamber provided in the case member, communicated with the outside of the ignition coil through the vent and extending from the vent side upward from the upper end surface around the opening of the plug hole; and from the upper end surface There is a communication path that connects the upper end of the water retention chamber in a direction away from the vent hole and the plug hole side, and the opening of the communication path that communicates with the water retention chamber and the vent hole are substantially A ventilation portion which is disposed at a maximum separation position and is closed on a side where the water retention chamber and the communication path communicate with each other;
An ignition coil comprising:
点火プラグとの結合側が内燃機関のプラグホールに挿入される点火コイルにおいて、
前記点火プラグに印加する高電圧を発生するコイル部と、
前記コイル部を収容し、前記プラグホールの外側で前記内燃機関に取り付けられるケース部材と、
前記ケース部材と前記内燃機関との間に取り付けられ、前記プラグホール内への水の侵入を防止するシール部材と、
前記ケース部材に設けられており、迷路構造の通気口を通して前記点火コイルの外部と連通し前記プラグホールの開口周囲の上端面から離れる上方に前記通気口側から延びている保水室、ならびに、前記上端面から前記通気口よりも離れる方向の前記保水室の上方端部と前記プラグホール側とを連通する連通路を有し、前記保水室と前記連通路とが連通している側が塞がれている通気部と、
を備える点火コイル。
In the ignition coil in which the coupling side with the spark plug is inserted into the plug hole of the internal combustion engine,
A coil section for generating a high voltage to be applied to the spark plug;
A case member that houses the coil portion and is attached to the internal combustion engine outside the plug hole;
A seal member attached between the case member and the internal combustion engine to prevent water from entering the plug hole;
A water retaining chamber provided in the case member, communicating with the outside of the ignition coil through a maze-structured vent and extending away from the upper end surface around the opening of the plug hole and extending from the vent side; and There is a communication path that connects the upper end of the water retention chamber in a direction away from the vent from the upper end surface and the plug hole side, and the side that connects the water retention chamber and the communication path is blocked. The ventilation part,
An ignition coil comprising:
点火プラグとの結合側が内燃機関のプラグホールに挿入される点火コイルにおいて、
前記点火プラグに印加する高電圧を発生するコイル部と、
前記コイル部を収容し、前記プラグホールの外側で前記内燃機関に取り付けられるケース部材と、
前記ケース部材と前記内燃機関との間に取り付けられ、前記プラグホール内への水の侵入を防止するシール部材と、
前記ケース部材に設けられており、前記上端面側に向けて下方に突出する突部に通気口が形成され、前記通気口を通して前記点火コイルの外部と連通し前記プラグホールの開口周囲の上端面から離れる上方に前記通気口側から延びている保水室、ならびに、前記上端面から前記通気口よりも離れる方向の前記保水室の上方端部と前記プラグホール側とを連通する連通路を有し、前記通気部の前記保水室と前記連通路との連通側開口が塞がれている通気部と、
を備える点火コイル。
In the ignition coil in which the coupling side with the spark plug is inserted into the plug hole of the internal combustion engine,
A coil section for generating a high voltage to be applied to the spark plug;
A case member that houses the coil portion and is attached to the internal combustion engine outside the plug hole;
A seal member attached between the case member and the internal combustion engine to prevent water from entering the plug hole;
A vent is formed in a protrusion provided on the case member and projecting downward toward the upper end surface side, and communicates with the outside of the ignition coil through the vent and the upper end surface around the opening of the plug hole A water retention chamber extending from the vent hole side above and a communication path communicating the upper end of the water retention chamber in a direction away from the vent hole from the upper end surface and the plug hole side. A ventilation part in which a communication side opening of the water retention chamber and the communication path of the ventilation part is closed;
An ignition coil comprising:
点火プラグとの結合側が内燃機関のプラグホールに挿入される点火コイルにおいて、
前記点火プラグに印加する高電圧を発生するコイル部と、
前記コイル部を収容し、前記プラグホールの外側で前記内燃機関に取り付けられるケース部材と、
前記ケース部材と前記内燃機関との間に取り付けられ、前記プラグホール内への水の侵入を防止するシール部材と、
前記ケース部材に設けられており、通気口を通して前記点火コイルの外部と連通し前記プラグホールの開口周囲の上端面から離れる上方に前記通気口側から延びている保水室、ならびに、前記上端面から前記通気口よりも離れる方向の前記保水室の上方端部と前記プラグホール側とを連通する連通路を有し、前記保水室と前記連通路とが連通している側が塞がれている通気部と、
前記保水室に充填されている多孔質または網目状の充填材と、
を備える点火コイル。
In the ignition coil in which the coupling side with the spark plug is inserted into the plug hole of the internal combustion engine,
A coil section for generating a high voltage to be applied to the spark plug;
A case member that houses the coil portion and is attached to the internal combustion engine outside the plug hole;
A seal member attached between the case member and the internal combustion engine to prevent water from entering the plug hole;
A water retaining chamber provided in the case member, communicated with the outside of the ignition coil through the vent and extending from the vent side upward from the upper end surface around the opening of the plug hole; and from the upper end surface Ventilation having a communication path that connects the upper end portion of the water retention chamber in a direction away from the vent and the plug hole side, and the side where the water retention chamber and the communication path communicate with each other is blocked And
A porous or mesh-like filler filled in the water retention chamber;
An ignition coil comprising:
前記通気口は前記プラグホールの開口周囲の前記上端面に向けて下方に開口している請求項1から30のいずれか一項に記載の点火コイル。   The ignition coil according to any one of claims 1 to 30, wherein the vent hole is opened downward toward the upper end surface around the opening of the plug hole. 前記保水室の容積は約1ccである請求項1から31のいずれか一項に記載の点火コイル。



32. The ignition coil according to claim 1, wherein the volume of the water retention chamber is about 1 cc.



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