JP2013204537A - Spark-ignition engine - Google Patents

Spark-ignition engine Download PDF

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JP2013204537A
JP2013204537A JP2012075560A JP2012075560A JP2013204537A JP 2013204537 A JP2013204537 A JP 2013204537A JP 2012075560 A JP2012075560 A JP 2012075560A JP 2012075560 A JP2012075560 A JP 2012075560A JP 2013204537 A JP2013204537 A JP 2013204537A
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coil case
plug
ignition
attached
spark
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JP5893989B2 (en
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Yasushi Inoue
裕史 井上
Masaharu Ono
雅治 大野
Noriaki Kobayashi
則章 小林
Yu Teruumi
裕 照海
Shunsuke Suenobu
俊介 末延
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Kubota Corp
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Kubota Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a spark-ignition engine in which an ignition coil case can be fixed even in a small-sized engine.SOLUTION: A coil case mounting stay (10) is mounted on an engine, the substrate (11) of the coil case mounting stay (10) is disposed at the upper side of a plug cap accommodation space (1a), and a tubular portion penetration part (12) is provided to the substrate (11). A coil case mounting part is provided in the upper portion of the substrate (11), a flexible tubular portion (8) penetrates the tubular portion penetration part (12), and an ignition coil case (7) is mounted on the coil case mounting part. The ignition coil case (7) is fixed to the coil case mounting stay (10), and an inlet fitting part (8a) of the flexible tubular portion (8) which is fitted to a plug hole inlet (4a), is tapered to reduce the diameter thereof toward the deep end of a plug hole (4).

Description

本発明は、火花点火式エンジンに関し、詳しくは、小型エンジンでも点火コイルケースを固定することができる火花点火式エンジンに関する。   The present invention relates to a spark ignition engine, and more particularly to a spark ignition engine capable of fixing an ignition coil case even in a small engine.

従来、火花点火式エンジンとして、シリンダヘッドの頂面にシリンダヘッドカバーを取り付け、シリンダヘッドカバーの外側でシリンダヘッドの頂面にプラグホールをあけ、プラグホールの奥に点火プラグを取り付け、点火プラグに点火コイル一体型のプラグキャップを取り付け、このプラグキャップは点火コイルケースに可撓性筒部を取り付けて構成し、可撓性筒部の先端部をプラグホールに差し込んで点火プラグに嵌合させたものがある(例えば、特許文献１参照)。
この種のエンジンによれば、点火コイルから点火プラグまでの距離を短くして、電圧のロスを最小限に抑えることができる利点がある。
しかし、この従来技術では、シリンダヘッドの頂面に取付フランジを取り付け、この取付フランジにホール延長筒を形成し、このホール延長筒をプラグホールと連通させ、ホール延長筒を介してプラグホールに可撓性筒部を差し込むようにし、ホール延長筒に点火コイルケースを固定するため、問題がある。 Conventionally, as a spark ignition type engine, a cylinder head cover is attached to the top surface of the cylinder head, a plug hole is made in the top surface of the cylinder head outside the cylinder head cover, an ignition plug is attached to the back of the plug hole, and an ignition coil is attached to the ignition plug. An integral plug cap is attached, and this plug cap is constructed by attaching a flexible cylinder part to an ignition coil case, and the tip of the flexible cylinder part is inserted into a plug hole and fitted to the ignition plug. Yes (see, for example, Patent Document 1).
This type of engine has the advantage that the distance from the ignition coil to the spark plug can be shortened to minimize voltage loss.
However, in this prior art, a mounting flange is attached to the top surface of the cylinder head, a hole extending cylinder is formed on the mounting flange, and the hole extending cylinder communicates with the plug hole, and the plug hole can be connected to the plug hole via the hole extending cylinder. There is a problem because the flexible cylinder portion is inserted and the ignition coil case is fixed to the hole extension cylinder.

特開２０１０−２５５６２１号公報(図３参照)JP 2010-255621 A (see FIG. 3)

《問題》 小型エンジンでは点火コイルケースを固定することができない。
シリンダヘッドの頂面に取付フランジを取り付け、この取付フランジにホール延長筒を形成し、このホール延長筒をプラグホールと連通させ、ホール延長筒を介してプラグホールに可撓性筒部を差し込むようにし、ホール延長筒に点火コイルケースを固定するため、シリンダヘッドの頂面に取付フランジを取り付ける必要があり、シリンダヘッドにそのようなスペースのない小型エンジンでは点火コイルケースを固定することができない。 <Problem> The ignition coil case cannot be fixed in a small engine.
A mounting flange is attached to the top surface of the cylinder head, a hole extension cylinder is formed on the mounting flange, the hole extension cylinder is communicated with the plug hole, and the flexible cylinder portion is inserted into the plug hole via the hole extension cylinder. In order to fix the ignition coil case to the hole extension cylinder, it is necessary to attach a mounting flange to the top surface of the cylinder head, and the ignition coil case cannot be fixed in a small engine having no such space in the cylinder head.

本発明の課題は、小型エンジンでも点火コイルケースを固定することができる火花点火式エンジンを提供することにある。   An object of the present invention is to provide a spark ignition engine capable of fixing an ignition coil case even in a small engine.

請求項１に係る発明の発明特定事項は、次の通りである。
図２に例示するように、シリンダヘッド(１)の頂面(２)にシリンダヘッドカバー(３)を取り付け、シリンダヘッドカバー(３)の外側でシリンダヘッド(１)の頂面(２)にプラグホール(４)をあけ、プラグホール(４)の奥に点火プラグ(５)を取り付け、点火プラグ(５)に点火コイル一体型のプラグキャップ(６)を取り付け、このプラグキャップ(６)は点火コイルケース(７)に可撓性筒部(８)を取り付けて構成し、可撓性筒部(８)の先端部をプラグホール(４)に差し込んで点火プラグ(５)に嵌合させた、火花点火式エンジンにおいて、
図１、図２に例示するように、シリンダヘッド(１)の横一側に吸気マニホルド(９)を取り付け、この吸気マニホルド(９)とシリンダヘッドカバー(３)との間にプラグキャップ収容空間(１ａ)を設け、エンジンにコイルケース取付ステー(１０)を取り付け、プラグキャップ収容空間(１ａ)の上方にコイルケース取付ステー(１０)の基板(１１)を配置し、この基板(１１)に筒部貫通部(１２)を設け、この基板(１１)の上部にコイルケース取付部(１３)を設け、可撓性筒部(８)を筒部貫通部(１２)に貫通させ、コイルケース取付部(１３)に点火コイルケース(７)を取り付けて、コイルケース取付ステー(１０)に点火コイルケース(７)を固定し、
図２に例示するように、プラグホール入口(４ａ)と嵌合する可撓性筒部(８)の入口嵌合部(８ａ)をプラグホール(４)の奥端に向かって縮径するテーパ状に形成した、ことを特徴とする火花点火式エンジン。 Invention specific matters of the invention according to claim 1 are as follows.
As shown in FIG. 2, a cylinder head cover (3) is attached to the top surface (2) of the cylinder head (1), and a plug hole is formed on the top surface (2) of the cylinder head (1) outside the cylinder head cover (3). (4) is opened, a spark plug (5) is attached to the back of the plug hole (4), a spark cap integrated plug cap (6) is attached to the spark plug (5), and this plug cap (6) is an ignition coil. The case (7) is configured by attaching the flexible tube portion (8), and the distal end portion of the flexible tube portion (8) is inserted into the plug hole (4) and fitted to the spark plug (5). In a spark ignition engine,
As illustrated in FIGS. 1 and 2, an intake manifold (9) is attached to one side of the cylinder head (1), and a plug cap accommodating space (between the intake manifold (9) and the cylinder head cover (3)). 1a), a coil case mounting stay (10) is mounted on the engine, a board (11) of the coil case mounting stay (10) is disposed above the plug cap housing space (1a), and a cylinder is placed on the board (11). A part penetration part (12) is provided, a coil case attachment part (13) is provided on the upper part of the substrate (11), a flexible cylinder part (8) is penetrated through the cylinder part penetration part (12), and a coil case is attached. The ignition coil case (7) is attached to the part (13), and the ignition coil case (7) is fixed to the coil case attachment stay (10).
As illustrated in FIG. 2, the taper that reduces the diameter of the inlet fitting portion (8a) of the flexible tube portion (8) that fits into the plug hole inlet (4a) toward the inner end of the plug hole (4). A spark ignition engine characterized by being formed into a shape.

(請求項１に係る発明)
請求項１に係る発明は、次の効果を奏する。
《効果》 小型のエンジンでも点火コイルケースを固定することができる。
図１、図２に例示するように、シリンダヘッド(１)の横一側に吸気マニホルド(９)を取り付け、この吸気マニホルド(９)とシリンダヘッドカバー(３)との間にプラグキャップ収容空間(１ａ)を設け、エンジンにコイルケース取付ステー(１０)を取り付け、プラグキャップ収容空間(１ａ)の上方にコイルケース取付ステー(１０)の基板(１１)を配置し、この基板(１１)に筒部貫通部(１２)を設け、この基板(１１)の上部にコイルケース取付部(１３)を設け、可撓性筒部(８)を筒部貫通部(１２)に貫通させ、コイルケース取付部(１３)に点火コイルケース(７)を取り付けて、コイルケース取付ステー(１０)に点火コイルケース(７)を固定したので、シリンダヘッド(１)の頂面(２)に取付フランジや取付ステーを取り付けるスペースがない小型エンジンでも点火コイルケース(７)を固定することができる。 (Invention of Claim 1)
The invention according to claim 1 has the following effects.
<Effect> The ignition coil case can be fixed even in a small engine.
As illustrated in FIGS. 1 and 2, an intake manifold (9) is attached to one side of the cylinder head (1), and a plug cap accommodating space (between the intake manifold (9) and the cylinder head cover (3)). 1a), a coil case mounting stay (10) is mounted on the engine, a board (11) of the coil case mounting stay (10) is disposed above the plug cap housing space (1a), and a cylinder is placed on the board (11). A part penetration part (12) is provided, a coil case attachment part (13) is provided on the upper part of the substrate (11), a flexible cylinder part (8) is penetrated through the cylinder part penetration part (12), and a coil case is attached. Since the ignition coil case (7) is attached to the part (13) and the ignition coil case (7) is fixed to the coil case attachment stay (10), the mounting flange or attachment is attached to the top surface (2) of the cylinder head (1). Even small engines that do not have enough space to install stays Can be fixed Rukesu (7).

《効果》 プラグキャップと点火プラグの嵌合不備を防止することができる。
図２に例示するように、プラグホール入口(４ａ)と嵌合する可撓性筒部(８)の入口嵌合部(８ａ)をプラグホール(４)の奥端に向かって縮径するテーパ状に形成したので、可撓性筒部(８)の先端部をプラグホール(４)に差し込んで点火プラグ(５)に嵌合させる場合に、狭いプラグキャップ収容空間(１ａ)の底に位置した可撓性筒部(８)の入口嵌合部(８ａ)に指を添えなくても、可撓性筒部(８)の入口嵌合部(８ａ)がテーパ形状によってプラグホール入口(４ａ)に捩れなく進入し、可撓性筒部(８)の捩れに起因するプラグキャップ(６)と点火プラグ(５)の嵌合不備を防止することができる。 <Effect> Incomplete fitting between the plug cap and the spark plug can be prevented.
As illustrated in FIG. 2, the taper that reduces the diameter of the inlet fitting portion (8a) of the flexible tube portion (8) that fits into the plug hole inlet (4a) toward the inner end of the plug hole (4). When the tip of the flexible tube portion (8) is inserted into the plug hole (4) and fitted into the spark plug (5), it is positioned at the bottom of the narrow plug cap housing space (1a). Even if a finger is not attached to the inlet fitting portion (8a) of the flexible cylindrical portion (8), the inlet fitting portion (8a) of the flexible cylindrical portion (8) is formed into a plug hole inlet (4a) due to the tapered shape. ) Without being twisted, and it is possible to prevent improper fitting between the plug cap (6) and the spark plug (5) due to the twist of the flexible cylindrical portion (8).

(請求項２に係る発明)
請求項２に係る発明は、請求項１に係る発明の効果に加え、次の効果を奏する。
《効果》 エンジンを小型のまま維持することができる。
図２に例示するように、前方から見て、プラグキャップ(６)の可撓性筒部(８)は、真っ直ぐな点火プラグ寄り部(１８)と真っ直ぐな点火コイルケース寄り部(１９)とで折れ曲がり状に形成し、シリンダヘッド(１)の頂面(２)に対する点火プラグ寄り部(１８)の仰角(１８ａ)よりも、シリンダヘッド(１)の頂面(２)に対する点火コイルケース寄り部(１９)の仰角(１９ａ)が大きくなるようにすることにより、点火コイルケース寄り部(１９)が垂直な姿勢、或いは、点火コイルケース寄り部(１９)が点火プラグ寄り部(１８)よりも垂直に近い姿勢となるようにしたので、プラグキャップ収容空間(１ａ)の横幅寸法を短く抑えることができ、エンジンを小型のまま維持することができる。 (Invention of Claim 2)
The invention according to claim 2 has the following effect in addition to the effect of the invention according to claim 1.
<Effect> The engine can be kept small.
As shown in FIG. 2, when viewed from the front, the flexible tube portion (8) of the plug cap (6) includes a straight spark plug portion (18) and a straight ignition coil case portion (19). It is formed in a bent shape, and is closer to the ignition coil case relative to the top surface (2) of the cylinder head (1) than the elevation angle (18a) of the spark plug portion (18) relative to the top surface (2) of the cylinder head (1). By increasing the elevation angle (19a) of the portion (19), the ignition coil case close portion (19) is in a vertical posture, or the ignition coil case close portion (19) is closer to the spark plug close portion (18). Since the posture is also close to vertical, the width of the plug cap housing space (1a) can be kept short, and the engine can be kept small.

《効果》 プラグホールに雨水や洗車時の洗浄水が進入するのを抑制することができる。
図２に例示するように、点火コイルケース寄り部(１９)が垂直な姿勢、或いは、点火コイルケース寄り部(１９)が点火プラグ寄り部(１８)よりも垂直に近い姿勢となるようにしたので、プラグホール(４)の真上に近い位置に点火コイルケース(７)やコイルケース取付ステー(１０)の基板(１１)が配置され、プラグホール(４)に雨水や洗車時の洗浄水が進入するのを抑制することができる。 <Effect> It is possible to prevent rainwater and washing water at the time of car washing from entering the plug hole.
As illustrated in FIG. 2, the ignition coil case close portion (19) is in a vertical posture, or the ignition coil case close portion (19) is in a posture closer to the vertical than the spark plug close portion (18). Therefore, the substrate (11) of the ignition coil case (7) and the coil case mounting stay (10) is disposed at a position close to the top of the plug hole (4), and rain water or washing water at the time of car washing is placed in the plug hole (4). Can be prevented from entering.

(請求項３に係る発明)
請求項３に係る発明は、請求項１または請求項２に係る発明の効果に加え、次の効果を奏する。
《効果》 筒部貫通部内での可撓性筒部のねじれによる損傷を防止することができる。
図１に、図５(Ｃ)に例示するように、点火コイルケース(７)をコイルケース取付部(１３)の縁部(１６)で廻り止めした状態で、舌片(１５)をコイルケース取付部(１３)にコイルケース取付ねじ具(１７)で取り付けて、コイルケース取付ステー(１０)に点火コイルケース(７)を固定したので、コイルケース取付ねじ具(１７)をねじ込んでも、点火コイルケース(７)や可撓性筒部(８)の連れ廻りが起こらず、筒部貫通部(１２)内での可撓性筒部(８)のねじれによる損傷を防止することができる。 (Invention of Claim 3)
The invention according to claim 3 has the following effect in addition to the effect of the invention according to claim 1 or claim 2.
<Effect> It is possible to prevent damage due to twisting of the flexible cylindrical portion in the cylindrical portion penetrating portion.
As illustrated in FIG. 1 (C), the tongue piece (15) is placed in the coil case with the ignition coil case (7) stopped at the edge (16) of the coil case mounting portion (13). Since the coil case mounting screw (17) is attached to the mounting portion (13) and the ignition coil case (7) is fixed to the coil case mounting stay (10), the ignition can be achieved even if the coil case mounting screw (17) is screwed in. The coil case (7) and the flexible cylindrical portion (8) are not rotated around, and damage due to twisting of the flexible cylindrical portion (8) in the cylindrical portion through portion (12) can be prevented.

(請求項４に係る発明)
請求項４に係る発明は、請求項１から請求項３のいずれかに係る発明の効果に加え、次の効果を奏する。
《効果》 燃料インジェクタや燃料デリバリーパイプの取り付け作業やメンテナンス作業をスムーズに行うことができる。
図３に例示するように、吸気マニホルド(９)の反プラグキャップ側で、吸気マニホルド(９)に燃料デリバリーパイプ(２９)を取り付け、この燃料デリバリーパイプ(２９)に燃料インジェクタ(２８)を取り付け、この燃料インジェクタ(２８)を吸気マニホルド(９)の分岐管(２７)の周壁に貫通させ、燃料インジェクタ(２８)のノズル(３８)を吸気ポート(３９)に臨ませたので、プラグキャップ(６)や吸気マニホルド(９)に妨げられることなく、燃料デリバリーパイプ(２９)や燃料インジェクタ(２８)の取り付け作業やメンテナンス作業をスムーズに行うことができる。 (Invention of Claim 4)
The invention according to claim 4 has the following effects in addition to the effects of the invention according to any one of claims 1 to 3.
<Effect> The fuel injector and the fuel delivery pipe can be smoothly attached and maintained.
As illustrated in FIG. 3, a fuel delivery pipe (29) is attached to the intake manifold (9) on the side opposite to the plug cap of the intake manifold (9), and a fuel injector (28) is attached to the fuel delivery pipe (29). Since the fuel injector (28) is passed through the peripheral wall of the branch pipe (27) of the intake manifold (9) and the nozzle (38) of the fuel injector (28) faces the intake port (39), the plug cap ( 6) The fuel delivery pipe (29) and the fuel injector (28) can be smoothly attached and maintained without being obstructed by the intake manifold (9).

本発明の実施形態に係る火花点火式エンジンの平面図である。1 is a plan view of a spark ignition engine according to an embodiment of the present invention. 図１のII−II線断面図である。It is the II-II sectional view taken on the line of FIG. 図１のIII−III線断面図である。It is the III-III sectional view taken on the line of FIG. 図１のIV方向矢視図である。FIG. 4 is a view in the direction of arrows IV in FIG. 1. 本発明の実施形態で用いる部品の説明図で、図５(Ａ)は点火コイル一体型のプラグキャップの斜視図、図５(Ｂ)はコイルケース取付ステーの斜視図、図５(Ｃ)は図１のＶＣ矢視部分の拡大図である。FIG. 5A is a perspective view of a plug cap integrated with an ignition coil, FIG. 5B is a perspective view of a coil case mounting stay, and FIG. 5C is an explanatory view of components used in the embodiment of the present invention. It is an enlarged view of the VC arrow part of FIG. 本発明の実施形態に係る火花点火式エンジンの要部を斜め前側から見下ろした斜視図である。It is the perspective view which looked down the principal part of the spark ignition type engine which concerns on embodiment of this invention from the diagonal front side.

図１〜図６は本発明の実施形態に係る火花点火式エンジンを説明する図であり、この実施形態では、水冷の立形直列３気筒の電子燃料噴射式ガソリンエンジンについて説明する。   1 to 6 are diagrams for explaining a spark ignition engine according to an embodiment of the present invention. In this embodiment, a water-cooled vertical in-line three-cylinder electronic fuel injection gasoline engine will be described.

このエンジンの概要は、次の通りである。
図４に示すように、シリンダブロック(３１)の上部にシリンダヘッド(１)を組み付け、シリンダブロック(３１)の前部に調時伝動ギヤケース(３２)を組み付け、調時伝動ギヤケース(３２)の前部にエンジン冷却ファン(３３)を配置し、シリンダブロック(３１)の後部にフライホイール(３５)を配置している。また、図２に示すように、シリンダヘッド(１)の上部にシリンダヘッドカバー(３)を組み付け、シリンダヘッド(１)の横一側に吸気マニホルド(９)を組み付けている。また、図１に示すように、シリンダヘッド(１)の横他側に排気マニホルド(３４)を組み付けている。 The outline of this engine is as follows.
As shown in FIG. 4, the cylinder head (1) is assembled to the top of the cylinder block (31), the timing transmission gear case (32) is assembled to the front of the cylinder block (31), and the timing transmission gear case (32) is assembled. An engine cooling fan (33) is disposed at the front, and a flywheel (35) is disposed at the rear of the cylinder block (31). Further, as shown in FIG. 2, a cylinder head cover (3) is assembled to the upper part of the cylinder head (1), and an intake manifold (9) is assembled to one side of the cylinder head (1). Further, as shown in FIG. 1, an exhaust manifold (34) is assembled on the other side of the cylinder head (1).

図２に示すように、シリンダヘッド(１)の頂面(２)にシリンダヘッドカバー(３)を取り付け、シリンダヘッドカバー(３)の外側でシリンダヘッド(１)の頂面(２)にプラグホール(４)をあけ、プラグホール(４)の奥に点火プラグ(５)を取り付け、点火プラグ(５)に点火コイル一体型のプラグキャップ(６)を取り付け、このプラグキャップ(６)は点火コイルケース(７)に可撓性筒部(８)を取り付けて構成し、可撓性筒部(８)の先端部をプラグホール(４)に差し込んで点火プラグ(５)に嵌合させている。
プラグホール(４)は、燃焼室(３６)に近づくにつれてシリンダヘッド(１)の幅方向中央部に近づくように下り傾斜させている。
可撓性筒部(８)はゴムの筒体で、内部には点火コイルケース(７)内のコイル(図外)と点火プラグ(５)とを電気的に接続する中継部材としてのスプリング(３７)を収容している。 As shown in FIG. 2, a cylinder head cover (3) is attached to the top surface (2) of the cylinder head (1) and a plug hole (2) is formed on the top surface (2) of the cylinder head (1) outside the cylinder head cover (3). 4) is opened, a spark plug (5) is attached to the back of the plug hole (4), and an ignition coil integrated plug cap (6) is attached to the spark plug (5). This plug cap (6) is an ignition coil case. A flexible cylinder portion (8) is attached to (7), and the distal end portion of the flexible cylinder portion (8) is inserted into the plug hole (4) and fitted into the spark plug (5).
The plug hole (4) is inclined downward so as to approach the center of the cylinder head (1) in the width direction as it approaches the combustion chamber (36).
The flexible cylinder portion (8) is a rubber cylinder, and a spring (as a relay member) that electrically connects a coil (not shown) in the ignition coil case (7) and the ignition plug (5) inside. 37).

図１、図２に示すように、シリンダヘッド(１)の横一側に吸気マニホルド(９)を取り付け、この吸気マニホルド(９)とシリンダヘッドカバー(３)との間にプラグキャップ収容空間(１ａ)を設け、エンジンにコイルケース取付ステー(１０)を取り付け、プラグキャップ収容空間(１ａ)の上方にコイルケース取付ステー(１０)の基板(１１)を配置し、この基板(１１)に筒部貫通部(１２)を設け、この基板(１１)の上部にコイルケース取付部(１３)を設け、可撓性筒部(８)を筒部貫通部(１２)に貫通させ、コイルケース取付部(１３)に点火コイルケース(７)を取り付けて、コイルケース取付ステー(１０)に点火コイルケース(７)を固定している。
図２に示すように、プラグホール入口(４ａ)と嵌合する可撓性筒部(８)の入口嵌合部(８ａ)をプラグホール(４)の奥端に向かって縮径するテーパ状に形成している。
プラグキャップ収容空間(１ａ)は、吸気マニホルド(９)のサージタンク(３０)とシリンダヘッドカバー(３)との間に形成されている。 As shown in FIGS. 1 and 2, an intake manifold (9) is attached to one side of the cylinder head (1), and a plug cap housing space (1a) is provided between the intake manifold (9) and the cylinder head cover (3). ), A coil case mounting stay (10) is mounted on the engine, a board (11) of the coil case mounting stay (10) is disposed above the plug cap housing space (1a), and a cylindrical portion is disposed on the board (11). A penetration part (12) is provided, a coil case attachment part (13) is provided on the upper part of the substrate (11), a flexible cylinder part (8) is passed through the cylinder part penetration part (12), and a coil case attachment part is provided. The ignition coil case (7) is attached to (13), and the ignition coil case (7) is fixed to the coil case attachment stay (10).
As shown in FIG. 2, the inlet fitting portion (8a) of the flexible tube portion (8) to be fitted to the plug hole inlet (4a) is tapered to reduce the diameter toward the inner end of the plug hole (4). Is formed.
The plug cap housing space (1a) is formed between the surge tank (30) of the intake manifold (9) and the cylinder head cover (3).

図２、図５(Ｂ)に示すように、コイルケース取付ステー(１０)はプラグキャップ(６)毎に設けられている。コイルケース取付ステー(１０)は板金で形成し、基板(１１)の吸気マニホルド(９)側の縁部(２０)から導出した導出片(２１)で取付脚(２２)を形成し、基板(１１)のシリンダヘッド(１)側の縁部(２３)から導出した導出片(２４)を折り曲げてコイルケース取付部(１３)を形成し、取付脚(２２)をステー取付手段(２６)で吸気マニホルド(９)のステー取付片(４４)に固定している。
図５(Ｂ)に示すように、コイルケース取付部(１３)は、基板(１１)のシリンダヘッド(１)側の縁部(２３)から導出した導出片(２４)を上向きに折り曲げた後、シリンダヘッド(１)側に折り曲げて折り曲げ片(４３)を形成し、その折り曲げ片(４３)にねじ孔(４１)をあけ、このねじ孔(４１)にコイルケース取付ねじ具(１７)をねじ込むようになっている。
筒部貫通部(１２)は円弧状の切欠きである。
ステー取付手段(２６)は、ねじ具である。 As shown in FIGS. 2 and 5B, the coil case mounting stay (10) is provided for each plug cap (6). The coil case mounting stay (10) is formed of a sheet metal, and a mounting leg (22) is formed by a lead-out piece (21) led out from the edge (20) on the intake manifold (9) side of the substrate (11). 11) The lead-out piece (24) led out from the edge (23) on the cylinder head (1) side is bent to form a coil case mounting portion (13), and the mounting leg (22) is fixed by the stay mounting means (26). It is fixed to the stay mounting piece (44) of the intake manifold (9).
As shown in FIG. 5 (B), the coil case mounting portion (13) is formed by bending the lead-out piece (24) led out from the edge (23) on the cylinder head (1) side of the substrate (11) upward. The cylinder head (1) is bent to form a bent piece (43), a screw hole (41) is formed in the bent piece (43), and a coil case mounting screw (17) is formed in the screw hole (41). It is designed to be screwed.
The cylinder part penetration part (12) is an arc-shaped notch.
The stay attaching means (26) is a screw tool.

図２に示すように、前方から見て、プラグキャップ(６)の可撓性筒部(８)は、真っ直ぐな点火プラグ寄り部(１８)と真っ直ぐな点火コイルケース寄り部(１９)とで折れ曲がり状に形成し、シリンダヘッド(１)の頂面(２)に対する点火プラグ寄り部(１８)の仰角(１８ａ)よりも、シリンダヘッド(１)の頂面(２)に対する点火コイルケース寄り部(１９)の仰角(１９ａ)が大きくなるようにすることにより、点火コイルケース寄り部(１９)が垂直な姿勢、或いは、点火コイルケース寄り部(１９)が点火プラグ寄り部(１８)よりも垂直に近い姿勢となるようにしている。   As shown in FIG. 2, when viewed from the front, the flexible tube portion (8) of the plug cap (6) is composed of a straight spark plug portion (18) and a straight ignition coil case portion (19). It is formed in a bent shape and is closer to the ignition coil case with respect to the top surface (2) of the cylinder head (1) than the elevation angle (18a) of the spark plug portion (18) with respect to the top surface (2) of the cylinder head (1). By making the elevation angle (19a) of (19) larger, the ignition coil case closer portion (19) is vertical, or the ignition coil case closer portion (19) is more than the spark plug closer portion (18). The posture is close to vertical.

図１、図５(Ｃ)に示すように、点火コイルケース(７)のコイルケース周壁(１４)から舌片(１５)を突出させ、この舌片(１５)をコイルケース取付部(１３)に載せ、コイルケース周壁(１４)をコイルケース取付部(１３)の縁部(１６)に接当させることにより、点火コイルケース(７)をコイルケース取付部(１３)の縁部(１６)で廻り止めした状態で、舌片(１５)をコイルケース取付部(１３)にコイルケース取付ねじ具(１７)で取り付けている。
図５(Ｃ)に示すように、コイルケース取付部(１３)の縁部(１６)は、直線状に形成されている。
コイルケース取付部(１３)の縁部(１６)に接当させる点火コイルケース(７)のコイルケース周壁(１４)は、平坦な形状に形成されている。点火コイルケース(７)はプラスチックの箱体である。図５(Ａ)に示すように、点火コイルケース(７)の舌片(１５)の反対側にはコネクタ(４２)が配置されている。 As shown in FIGS. 1 and 5C, a tongue piece (15) is projected from the coil case peripheral wall (14) of the ignition coil case (7), and the tongue piece (15) is connected to the coil case mounting portion (13). The ignition coil case (7) is attached to the edge portion (16) of the coil case attachment portion (13) by placing the coil case peripheral wall (14) in contact with the edge portion (16) of the coil case attachment portion (13). The tongue piece (15) is attached to the coil case attaching portion (13) with the coil case attaching screw tool (17) in the state where the rotation is stopped by.
As shown in FIG. 5C, the edge portion (16) of the coil case mounting portion (13) is formed in a straight line.
The coil case peripheral wall (14) of the ignition coil case (7) to be brought into contact with the edge (16) of the coil case mounting portion (13) is formed in a flat shape. The ignition coil case (7) is a plastic box. As shown in FIG. 5A, a connector (42) is arranged on the opposite side of the tongue piece (15) of the ignition coil case (7).

図３に示すように、吸気マニホルド(９)の反プラグキャップ側で、吸気マニホルド(９)に燃料デリバリーパイプ(２９)を取り付け、この燃料デリバリーパイプ(２９)に燃料インジェクタ(２８)を取り付け、この燃料インジェクタ(２８)を吸気マニホルド(９)の分岐管(２７)の周壁に貫通させ、燃料インジェクタ(２８)のノズル(３８)を吸気ポート(３９)に臨ませている。
吸気マニホルド(９)のサージタンク(３０)の天井壁部(９ｂ)には吸気センサ(２５)が取り付けられ、この吸気センサ(２５)で吸気圧や吸気流量を検出する。 As shown in FIG. 3, the fuel delivery pipe (29) is attached to the intake manifold (9) on the side opposite to the plug cap of the intake manifold (9), and the fuel injector (28) is attached to the fuel delivery pipe (29). The fuel injector (28) is passed through the peripheral wall of the branch pipe (27) of the intake manifold (9), and the nozzle (38) of the fuel injector (28) faces the intake port (39).
An intake sensor (25) is attached to the ceiling wall (9b) of the surge tank (30) of the intake manifold (9), and the intake pressure and the intake flow rate are detected by the intake sensor (25).

(１) シリンダヘッド
(１ａ) プラグキャップ収容空間
(２) 頂面
(３) シリンダヘッドカバー
(４) プラグホール
(４ａ) プラグホール入口
(５) 点火プラグ
(６) プラグキャップ
(７) 点火コイルケース
(８) 可撓性筒部
(８ａ) 入口嵌合部
(９) 吸気マニホルド
(１０) コイルケース取付ステー
(１１) 基板
(１２) 筒部貫通孔
(１３) コルイケース取付部
(１４) コイルケース周壁
(１５) 舌片
(１６) 縁部
(１７) コイルケース取付ねじ具
(１８) 点火プラグ寄り部
(１８ａ) 仰角
(１９) 点火コイルケース寄り部
(１９ａ) 仰角
(２７) 分岐管
(２８) 燃料インジェクタ
(２９) 燃料デリバリーパイプ
(３８) ノズル
(３９) 吸気ポート (1) Cylinder head
(1a) Plug cap storage space
(2) Top surface
(3) Cylinder head cover
(4) Plug hole
(4a) Plug hole entrance
(5) Spark plug
(6) Plug cap
(7) Ignition coil case
(8) Flexible tube
(8a) Entrance fitting part
(9) Intake manifold
(10) Coil case mounting stay
(11) Board
(12) Cylindrical through hole
(13) Colloi case attachment
(14) Coil case peripheral wall
(15) Tongue
(16) Edge
(17) Coil case mounting screw
(18) Near spark plug
(18a) Elevation angle
(19) Ignition coil case side
(19a) Elevation angle
(27) Branch pipe
(28) Fuel injector
(29) Fuel delivery pipe
(38) Nozzle
(39) Intake port

Claims (4)

シリンダヘッド(１)の頂面(２)にシリンダヘッドカバー(３)を取り付け、シリンダヘッドカバー(３)の外側でシリンダヘッド(１)の頂面(２)にプラグホール(４)をあけ、プラグホール(４)の奥に点火プラグ(５)を取り付け、点火プラグ(５)に点火コイル一体型のプラグキャップ(６)を取り付け、このプラグキャップ(６)は点火コイルケース(７)に可撓性筒部(８)を取り付けて構成し、可撓性筒部(８)の先端部をプラグホール(４)に差し込んで点火プラグ(５)に嵌合させた、火花点火式エンジンにおいて、
シリンダヘッド(１)の横一側に吸気マニホルド(９)を取り付け、この吸気マニホルド(９)とシリンダヘッドカバー(３)との間にプラグキャップ収容空間(１ａ)を設け、エンジンにコイルケース取付ステー(１０)を取り付け、プラグキャップ収容空間(１ａ)の上方にコイルケース取付ステー(１０)の基板(１１)を配置し、この基板(１１)に筒部貫通部(１２)を設け、この基板(１１)の上部にコイルケース取付部(１３)を設け、可撓性筒部(８)を筒部貫通部(１２)に貫通させ、コイルケース取付部(１３)に点火コイルケース(７)を取り付けて、コイルケース取付ステー(１０)に点火コイルケース(７)を固定し、
プラグホール入口(４ａ)と嵌合する可撓性筒部(８)の入口嵌合部(８ａ)をプラグホール(４)の奥端に向かって縮径するテーパ状に形成した、ことを特徴とする火花点火式エンジン。 A cylinder head cover (3) is attached to the top surface (2) of the cylinder head (1), and a plug hole (4) is formed in the top surface (2) of the cylinder head (1) outside the cylinder head cover (3). A spark plug (5) is attached to the back of (4), an ignition coil integrated plug cap (6) is attached to the spark plug (5), and this plug cap (6) is flexible to the ignition coil case (7). In a spark ignition type engine having a cylindrical portion (8) attached and having a flexible cylindrical portion (8) inserted into a plug hole (4) and fitted into a spark plug (5),
An intake manifold (9) is attached to one side of the cylinder head (1), a plug cap housing space (1a) is provided between the intake manifold (9) and the cylinder head cover (3), and a coil case mounting stay is provided in the engine. (10) is mounted, the board (11) of the coil case mounting stay (10) is arranged above the plug cap housing space (1a), and a cylindrical part through portion (12) is provided on the board (11). A coil case attaching part (13) is provided on the upper part of (11), the flexible cylindrical part (8) is passed through the cylindrical part penetrating part (12), and an ignition coil case (7) is connected to the coil case attaching part (13). And fix the ignition coil case (7) to the coil case mounting stay (10).
The inlet fitting portion (8a) of the flexible tube portion (8) to be fitted to the plug hole inlet (4a) is formed in a tapered shape with a diameter decreasing toward the inner end of the plug hole (4). A spark ignition engine. 請求項１に記載した火花点火式エンジンにおいて、
前方から見て、プラグキャップ(６)の可撓性筒部(８)は、真っ直ぐな点火プラグ寄り部(１８)と真っ直ぐな点火コイルケース寄り部(１９)とで折れ曲がり状に形成し、シリンダヘッド(１)の頂面(２)に対する点火プラグ寄り部(１８)の仰角(１８ａ)よりも、シリンダヘッド(１)の頂面(２)に対する点火コイルケース寄り部(１９)の仰角(１９ａ)が大きくなるようにすることにより、点火コイルケース寄り部(１９)が垂直な姿勢、或いは、点火コイルケース寄り部(１９)が点火プラグ寄り部(１８)よりも垂直に近い姿勢となるようにした、ことを特徴とする火花点火式エンジン。 The spark ignition engine according to claim 1,
When viewed from the front, the flexible tube portion (8) of the plug cap (6) is formed into a bent shape with a straight spark plug closer portion (18) and a straight ignition coil case closer portion (19). The elevation angle (19a) of the ignition coil case portion (19) relative to the top surface (2) of the cylinder head (1) rather than the elevation angle (18a) of the spark plug portion (18) relative to the top surface (2) of the head (1). ) Is increased so that the ignition coil case close portion (19) is in a vertical posture or the ignition coil case close portion (19) is in a posture closer to the vertical than the spark plug close portion (18). A spark ignition engine characterized by that. 請求項１または請求項２に記載した火花点火式エンジンにおいて、
点火コイルケース(７)のコイルケース周壁(１４)から舌片(１５)を突出させ、この舌片(１５)をコイルケース取付部(１３)に載せ、コイルケース周壁(１４)をコイルケース取付部(１３)の縁部(１６)に接当させることにより、点火コイルケース(７)をコイルケース取付部(１３)の縁部(１６)で廻り止めした状態で、舌片(１５)をコイルケース取付部(１３)にコイルケース取付ねじ具(１７)で取り付けた、ことを特徴とする火花点火式エンジン。 The spark ignition type engine according to claim 1 or 2,
The tongue piece (15) protrudes from the coil case peripheral wall (14) of the ignition coil case (7), the tongue piece (15) is placed on the coil case attachment portion (13), and the coil case peripheral wall (14) is attached to the coil case. The tongue piece (15) is brought into contact with the edge portion (16) of the portion (13) so that the ignition coil case (7) is prevented from turning around the edge portion (16) of the coil case mounting portion (13). A spark ignition type engine characterized by being attached to a coil case attaching portion (13) with a coil case attaching screw (17). 請求項１から請求項３のいずれかに記載した火花点火式エンジンにおいて、
吸気マニホルド(９)の反プラグキャップ側で、吸気マニホルド(９)に燃料デリバリーパイプ(２９)を取り付け、この燃料デリバリーパイプ(２９)に燃料インジェクタ(２８)を取り付け、この燃料インジェクタ(２８)を吸気マニホルド(９)の分岐管(２７)の周壁に貫通させ、燃料インジェクタ(２８)のノズル(３８)を吸気ポート(３９)に臨ませた、ことを特徴とする火花点火式エンジン。 The spark ignition engine according to any one of claims 1 to 3,
A fuel delivery pipe (29) is attached to the intake manifold (9) on the side opposite to the plug cap of the intake manifold (9), a fuel injector (28) is attached to the fuel delivery pipe (29), and the fuel injector (28) is attached. A spark ignition engine characterized in that it passes through the peripheral wall of the branch pipe (27) of the intake manifold (9) and the nozzle (38) of the fuel injector (28) faces the intake port (39).
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Cited By (1)

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CN115263593A (en) * 2022-07-14 2022-11-01 东风汽车集团股份有限公司 Ignition compression ignition engine and vehicle

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