JP3853582B2 - Structure of cylinder head cover in internal combustion engine - Google Patents

Structure of cylinder head cover in internal combustion engine Download PDF

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Publication number
JP3853582B2
JP3853582B2 JP2000255679A JP2000255679A JP3853582B2 JP 3853582 B2 JP3853582 B2 JP 3853582B2 JP 2000255679 A JP2000255679 A JP 2000255679A JP 2000255679 A JP2000255679 A JP 2000255679A JP 3853582 B2 JP3853582 B2 JP 3853582B2
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Prior art keywords
gas
cylinder head
air cleaner
head cover
liquid separation
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JP2000255679A
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JP2002070521A (en
Inventor
大文 岡田
栄一 小松
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Daihatsu Motor Co Ltd
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Daihatsu Motor Co Ltd
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Priority to JP2000255679A priority Critical patent/JP3853582B2/en
Priority to DE2001623350 priority patent/DE60123350T2/en
Priority to EP20010120268 priority patent/EP1182343B1/en
Publication of JP2002070521A publication Critical patent/JP2002070521A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F7/00—Casings, e.g. crankcases or frames
    • F02F7/006—Camshaft or pushrod housings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/18—DOHC [Double overhead camshaft]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F2001/244—Arrangement of valve stems in cylinder heads
    • F02F2001/245—Arrangement of valve stems in cylinder heads the valve stems being orientated at an angle with the cylinder axis

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
  • Ignition Installations For Internal Combustion Engines (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は，内燃機関において，そのシリンダヘッドの上面に，当該上面における動弁機構室を覆うように取付けられるシリンダヘッドカバーの構造に関するものである。
【０００２】
【従来の技術】
従来の内燃機関においては，シリンダヘッドの上面に覆うヘッドカバーと，エアクリーナとを別体に構成しているために，部品点数が多くなるばかりか，エアクリーナを含めた全体が可成りに大型化し，且つ，重量のアップを招来するのであった。
【０００３】
そこで，先行技術としての特開平９−１１２３５８号公報は，シリンダヘッドの上面を覆うシリンダヘッドカバーの上面に，エアクリーナを一体的に設けることにより，部品点数の減少，小型・軽量化等を図ることを提案している。
【０００４】
【発明が解決しようとする課題】
しかし，この先行技術のものは，シリンダヘッドカバーの内部に，ブローバイガスに対する気液分離室を形成し，この気液分離室の上側にエアクリーナを一体的に設けるという構成にしていることにより，換言すると，このシリンダヘッドカバーは，気液分離室の上にエアクリーナを設けるというように二段重ねになっているから，エアクリーナを含むシリンダヘッドカバー全体の高さが，前記気液分離室の分だけ高くなるという問題があった。
【０００５】
この場合，シリンダヘッドカバー全体の高さを低くするために，気液分離室及びエアクリーナの内容積を縮小することは，気液分離室における潤滑油の分離性能の低下，エアクリーナにて吸気騒音を低減する性能が低下する等を招来する。
【０００６】
本発明は，シリンダヘッドカバーにエアクリーナと気液分離室とを設ける場合に，その高さを，前記エアクリーナ及び気液分離室の内容積を縮小することなく，確実に低くすることを技術的課題とするものである。
【０００７】
【課題を解決するための手段】
この技術的課題を達成するため本発明の請求項１は，
「シリンダヘッドの上面を覆うシリンダヘッドカバーの上面に，ブローバイガスに対する気液分離室と，エアクリーナとを設けるとともに，列状に並べた複数の各気筒の各々に対する点火コイルを気筒列の方向に並べて配設して成る内燃機関において，
前記気液分離室とエアクリーナとを，気筒列の方向から見て左右の横方向に並べて気筒列の方向に延びるように配設し，前記気液分離室を，前記エアクリーナの高さ方向に突出するように前記シリンダヘッドカバーに一体に構成する一方，前記エアクリーナを，シリンダヘッドカバーに一体に形成したダストサイドケースと，このダストサイドケースの上面に対してフイルタエレメントを挟んで着脱自在に接合したクリーンサイドケースとで構成し，前記ダストサイドケースにおける内底面に，前記各気筒に対する点火コイルを配設したことを特徴とする。」
ものである。
【０００８】
【発明の作用・効果】
シリンダヘッドカバーに気液分離室とエアクリーナとを一体に設ける場合において，前記したように，気液分離室とエアクリーナとを，気筒列の方向から見て左右の横方向に並べ，前記気筒列の方向に延びるように配設し，前記気液分離室を，前記エアクリーナの高さ方向に突出するように前記シリンダヘッドカバーに一体に構成したことにより，シリンダヘッドカバー全体の高さ寸法に，前記先行技術のように，気液分離室の高さ寸法が加算されることを回避できるから，シリンダヘッドカバー全体の高さ寸法を，気液分離室及びエアクリーナの内容積を縮小することなく，換言すると，気液分離室における潤滑油の分離性能及びエアクリーナにおける吸気騒音の低減性能を低下を招来することなく，低くすることができる。
【０００９】
これに加えて，前記エアクリーナを，シリンダヘッドカバーに一体に形成したダストサイドケースと，このダストサイドケースの上面に対してフイルタエレメントを挟んで着脱自在に接合したクリーンサイドケースとで構成し，前記ダストサイドケース内に，内燃機関における複数の各気筒の各々に対する点火コイルを配設したことにより，前記エアクリーナが，各気筒における点火コイルに対するカバーを兼用するとともに，前記各点火コイルを，エアクリーナ内を流れる空気にて冷却することができる効果を有する。
【００１０】
しかも，前記気液分離室を，各気筒列の方向に延びるように構成したことにより，この気液分離室における内容積を内燃機関における各気筒列の方向に拡大できるから，その潤滑油の分離性能を更に向上できる。
【００１１】
【発明の実施の形態】
以下，本発明の実施の形態を，図１及び図２の図面について説明する。
【００１２】
この図において，符号１は，複数の気筒を列状に備えた多気筒内燃機関におけるシリンダヘッドを示し，このシリンダヘッド１上面には，当該上面における動弁機構室２を塞ぐためのシリンダヘッドカバー３が，着脱自在に接合されている。
【００１３】
このシリンダヘッドカバー３には，エアクリーナ４と，ブローバイガスに対する気液分離室５とが一体的に設けられる。
【００１４】
すなわち，前記シリンダヘッドカバー３に，前記エアクリーナ４における下部のダストサイドケース４ａと，前記気液分離室５とを，これらを横に並べて，且つ，前記気液分離室５が上向きに突出した形態で平面視において内燃機関における気筒列の方向に延びるように一体的に形成する。
【００１５】
前記ダストサイドケース４ａに，大気からの空気取り入れ管路６を接続するとともに，このダストサイドケース４ａ内部に，前記内燃機関における各気筒に対する点火コイル７を配設する。
【００１６】
そして，前記ダストサイドケース４ａの上面に，エアクリーナ４における上部のクリーンサイドケース４ｂを，その間にフイルタエレメント４ｃを挟んで着脱自在に接合して，このクリーンサイドケース４ｂに，内燃機関における各気筒に吸気を分配する吸気マニホールド８に取付けたスロットルボデー９へのゴム等の軟質弾性体にて蛇腹管に構成した吸気ダクト１０を接続する一方，この吸気ダクト１０に，前記気液分離室５からブローバイガス出口管路１１を接続する。
【００１７】
なお，前記吸気ダクト１０は，前記スロットルボデー９に対して着脱自在に差し込み接続されている一方，この吸気ダクト１０に，前記気液分離室５からのブローバイガス出口管路１１が着脱自在に差し込み接続されている。
【００１８】
この構成において，エアクリーナ４におけるダストサイドケース４ａ内に空気取り入れ管路６から流入した空気は，このダストサイドケース４ａ内に設けられている各点火コイル７を冷却したのちフイルタエレメント４ｃを通過してクリーンサイドケース４ｂ内に入り，このクリーンサイドケース４ｂ内から吸気ダクト１０を介してスロットルボデー９に至り，このスロットルボデー９から吸気マニホールド８を介して内燃機関における各気筒に吸気される。
【００１９】
一方，前記シリンダヘッド１における動弁機構室２内のブローバイガスは，気液分離室５内に流入して，ここで潤滑油が分離されたのち，ブローバイガス出口管路１１を介して前記各気筒への吸気に混合される。
【００２０】
この場合において，気液分離室５とエアクリーナ４とは横に並んでおり，且つ，気液分離室５がエアクリーナ４の高さ方向に突出しているから，シリンダヘッドカバー全体の高さ寸法を，気液分離室５及びエアクリーナ４の内容積を縮小することなく，換言すると，気液分離室５における潤滑油の分離性能及びエアクリーナ４における吸気騒音の低減性能を低下を招来することなく，低くすることができる。
【００２１】
また，前記気液分離室５は，平面視において各気筒列の方向に延びていることにより，この気液分離室５の内容積を大幅に増大することができる。
【図面の簡単な説明】
【図１】 本発明の実施の形態を示す一部切欠縦断正面図である。
【図２】 図１のII−II視平断面図である。
【符号の説明】
１ シリンダヘッド
２ 動弁機構室
３ シリンダヘッドカバー
４ エアクリーナ
４ａ ダストサイドケース
４ｂ クリーンサイドケース
５ 気液分離室
６ 空気取り入れ管路
７ 点火コイル
８ 吸気マニホールド
９ スロットルボデー
１０ 吸気ダクト
１１ ブローバイガス出口管路[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure of a cylinder head cover attached to an upper surface of a cylinder head of an internal combustion engine so as to cover a valve mechanism chamber on the upper surface.
[0002]
[Prior art]
In a conventional internal combustion engine, the head cover covering the upper surface of the cylinder head and the air cleaner are configured separately, so that not only the number of parts is increased, but the whole including the air cleaner is considerably enlarged, and ， Invited an increase in weight.
[0003]
Therefore, Japanese Patent Application Laid-Open No. 9-112358 as a prior art is intended to reduce the number of parts, reduce the size and weight, etc. by integrally providing an air cleaner on the upper surface of the cylinder head cover that covers the upper surface of the cylinder head. is suggesting.
[0004]
[Problems to be solved by the invention]
However, in this prior art, a gas-liquid separation chamber for blow-by gas is formed inside the cylinder head cover, and an air cleaner is integrally provided above the gas-liquid separation chamber. Because this cylinder head cover is stacked in two stages such that an air cleaner is provided on the gas-liquid separation chamber, the overall height of the cylinder head cover including the air cleaner is increased by the amount of the gas-liquid separation chamber. There was a problem.
[0005]
In this case, in order to reduce the overall height of the cylinder head cover, reducing the internal volume of the gas-liquid separation chamber and air cleaner reduces the lubricating oil separation performance in the gas-liquid separation chamber and reduces intake noise in the air cleaner. Incurs a decrease in performance.
[0006]
It is a technical object of the present invention to reliably reduce the height of an air cleaner and a gas-liquid separation chamber when the cylinder head cover is provided without reducing the internal volume of the air cleaner and the gas-liquid separation chamber. To do.
[0007]
[Means for Solving the Problems]
In order to achieve this technical problem, claim 1 of the present invention provides:
“A gas-liquid separation chamber for blow-by gas and an air cleaner are provided on the upper surface of the cylinder head cover that covers the upper surface of the cylinder head, and ignition coils for each of a plurality of cylinders arranged in a row are arranged in the direction of the cylinder row. In the internal combustion engine constructed ,
The gas-liquid separation chamber and the air cleaner are arranged so as to extend in the direction of the cylinder row side by side in the horizontal direction when viewed from the direction of the cylinder row, and the gas-liquid separation chamber projects in the height direction of the air cleaner. The air cleaner is integrated with the cylinder head cover, and the air cleaner is integrally formed on the cylinder head cover. The clean side is detachably joined to the upper surface of the dust side case with a filter element interposed therebetween. And an ignition coil for each cylinder is disposed on the inner bottom surface of the dust side case . "
Is.
[0008]
[Operation and effect of the invention]
When the gas-liquid separation chamber and the air cleaner are integrally provided in the cylinder head cover, as described above, the gas-liquid separation chamber and the air cleaner are arranged in the horizontal direction when viewed from the cylinder row direction, and the direction of the cylinder row is determined. And the gas-liquid separation chamber is formed integrally with the cylinder head cover so as to protrude in the height direction of the air cleaner . Thus, the addition of the height of the gas-liquid separation chamber can be avoided, so that the overall height of the cylinder head cover can be reduced without reducing the internal volume of the gas-liquid separation chamber and the air cleaner. The separation performance of the lubricating oil in the separation chamber and the intake noise reduction performance in the air cleaner can be lowered without incurring a decrease.
[0009]
In addition, the air cleaner includes a dust side case formed integrally with the cylinder head cover, and a clean side case that is detachably joined to the upper surface of the dust side case with a filter element interposed therebetween. Since the ignition coil for each of the plurality of cylinders in the internal combustion engine is disposed in the side case, the air cleaner also serves as a cover for the ignition coil in each cylinder, and the ignition coil flows through the air cleaner. It has the effect that it can be cooled with air.
[0010]
Moreover, since the gas-liquid separation chamber extends in the direction of each cylinder row, the internal volume in the gas-liquid separation chamber can be expanded in the direction of each cylinder row in the internal combustion engine. The performance can be further improved.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
[0012]
In this figure, reference numeral 1 denotes a cylinder head in a multi-cylinder internal combustion engine having a plurality of cylinders arranged in a line, and a cylinder head cover 3 for closing the valve mechanism chamber 2 on the upper surface of the cylinder head 1. Are detachably joined.
[0013]
The cylinder head cover 3 is integrally provided with an air cleaner 4 and a gas-liquid separation chamber 5 for blow-by gas.
[0014]
That is, a lower dust side case 4a in the air cleaner 4 and the gas-liquid separation chamber 5 are arranged side by side on the cylinder head cover 3, and the gas-liquid separation chamber 5 protrudes upward. They are integrally formed so as to extend in the direction of the cylinder row in the internal combustion engine in plan view.
[0015]
An air intake duct 6 from the atmosphere is connected to the dust side case 4a, and an ignition coil 7 for each cylinder in the internal combustion engine is disposed inside the dust side case 4a.
[0016]
An upper clean side case 4b of the air cleaner 4 is detachably joined to the upper surface of the dust side case 4a with a filter element 4c interposed therebetween, and the clean side case 4b is connected to each cylinder of the internal combustion engine. An intake duct 10 configured as a bellows tube is connected to a throttle body 9 attached to an intake manifold 8 that distributes intake air with a soft elastic body such as rubber, and blow-by from the gas-liquid separation chamber 5 is connected to the intake duct 10. A gas outlet line 11 is connected.
[0017]
The intake duct 10 is detachably inserted and connected to the throttle body 9, while the blow-by gas outlet pipe 11 from the gas-liquid separation chamber 5 is detachably inserted into the intake duct 10. It is connected.
[0018]
In this configuration, air flowing from the air intake pipe 6 into the dust side case 4a of the air cleaner 4 passes through the filter element 4c after cooling each ignition coil 7 provided in the dust side case 4a. The air enters the clean side case 4b, reaches the throttle body 9 from the clean side case 4b through the intake duct 10, and is sucked into each cylinder in the internal combustion engine through the intake manifold 8 from the throttle body 9.
[0019]
On the other hand, the blow-by gas in the valve mechanism chamber 2 in the cylinder head 1 flows into the gas-liquid separation chamber 5 where the lubricating oil is separated and then each of the blow-by gases via the blow-by gas outlet pipe 11. It is mixed with the intake air to the cylinder.
[0020]
In this case, the gas-liquid separation chamber 5 and the air cleaner 4 are arranged side by side, and the gas-liquid separation chamber 5 protrudes in the height direction of the air cleaner 4. Without reducing the internal volume of the liquid separation chamber 5 and the air cleaner 4, in other words, reducing the separation performance of the lubricating oil in the gas-liquid separation chamber 5 and the performance of reducing the intake noise in the air cleaner 4 without causing a decrease. Can do.
[0021]
Further, the gas-liquid separation chamber 5, by are extending the Activity in the direction of the cylinder row in a plan view, the internal volume of the gas-liquid separation chamber 5 can be increased considerably.
[Brief description of the drawings]
FIG. 1 is a partially cut longitudinal front view showing an embodiment of the present invention.
FIG. 2 is a sectional view taken along the line II-II in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cylinder head 2 Valve mechanism mechanism 3 Cylinder head cover 4 Air cleaner 4a Dust side case 4b Clean side case 5 Gas-liquid separation chamber 6 Air intake line 7 Ignition coil 8 Intake manifold 9 Throttle body 10 Intake duct 11 Blow-by gas exit line

Claims (1)

シリンダヘッドの上面を覆うシリンダヘッドカバーの上面に，ブローバイガスに対する気液分離室と，エアクリーナとを設けるとともに，列状に並べた複数の各気筒の各々に対する点火コイルを気筒列の方向に並べて配設して成る内燃機関において，
前記気液分離室とエアクリーナとを，気筒列の方向から見て左右の横方向に並べて気筒列の方向に延びるように配設し，前記気液分離室を，前記エアクリーナの高さ方向に突出するように前記シリンダヘッドカバーに一体に構成する一方，前記エアクリーナを，シリンダヘッドカバーに一体に形成したダストサイドケースと，このダストサイドケースの上面に対してフイルタエレメントを挟んで着脱自在に接合したクリーンサイドケースとで構成し，前記ダストサイドケースにおける内底面に，前記各気筒に対する点火コイルを配設したことを特徴とする内燃機関におけるシリンダヘッドカバーの構造。A gas-liquid separation chamber for blow-by gas and an air cleaner are provided on the upper surface of the cylinder head cover that covers the upper surface of the cylinder head, and ignition coils for each of a plurality of cylinders arranged in a row are arranged in the direction of the cylinder row. In an internal combustion engine consisting of
The gas-liquid separation chamber and the air cleaner are arranged so as to extend in the direction of the cylinder row side by side in the horizontal direction when viewed from the direction of the cylinder row, and the gas-liquid separation chamber projects in the height direction of the air cleaner. The air cleaner is integrated with the cylinder head cover, and the air cleaner is integrally formed on the cylinder head cover. The clean side is detachably joined to the upper surface of the dust side case with a filter element interposed therebetween. A structure of a cylinder head cover in an internal combustion engine , wherein an ignition coil for each of the cylinders is disposed on an inner bottom surface of the dust side case .
JP2000255679A 2000-08-25 2000-08-25 Structure of cylinder head cover in internal combustion engine Expired - Fee Related JP3853582B2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2000255679A JP3853582B2 (en) 2000-08-25 2000-08-25 Structure of cylinder head cover in internal combustion engine
DE2001623350 DE60123350T2 (en) 2000-08-25 2001-08-23 Cylinder head cover for a combustion engine
EP20010120268 EP1182343B1 (en) 2000-08-25 2001-08-23 Arrangement of cylinder head cover for internal combustion engine

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Application Number Priority Date Filing Date Title
JP2000255679A JP3853582B2 (en) 2000-08-25 2000-08-25 Structure of cylinder head cover in internal combustion engine

Publications (2)

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JP2002070521A JP2002070521A (en) 2002-03-08
JP3853582B2 true JP3853582B2 (en) 2006-12-06

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JP4960763B2 (en) * 2007-05-16 2012-06-27 本田技研工業株式会社 Internal combustion engine head cover
KR101178227B1 (en) 2010-09-28 2012-08-30 기아자동차주식회사 Intergrated air intake system
CN102733890B (en) * 2012-07-03 2014-09-10 中国南方航空工业(集团)有限公司 Oil-gas separation device of aero star-shaped piston engine
CN102996299B (en) * 2012-11-23 2016-01-20 优华劳斯汽车系统（上海）有限公司 A kind of gas handling system of multicylinder engine
JP7081976B2 (en) * 2018-05-14 2022-06-07 株式会社クボタ Engine with blow-by gas recirculation device
JP7063802B2 (en) * 2018-12-31 2022-05-09 株式会社クボタ Cylinder head cover
JP7188241B2 (en) * 2019-04-02 2022-12-13 スズキ株式会社 motorcycle

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