JP4075717B2 - Cylinder head structure of internal combustion engine - Google Patents

Cylinder head structure of internal combustion engine Download PDF

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Publication number
JP4075717B2
JP4075717B2 JP2003201793A JP2003201793A JP4075717B2 JP 4075717 B2 JP4075717 B2 JP 4075717B2 JP 2003201793 A JP2003201793 A JP 2003201793A JP 2003201793 A JP2003201793 A JP 2003201793A JP 4075717 B2 JP4075717 B2 JP 4075717B2
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Japan
Prior art keywords
tappet
exhaust
intake
hole
top plate
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Expired - Fee Related
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JP2003201793A
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Japanese (ja)
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JP2005042587A (en
Inventor
昭将 山本
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Mitsubishi Motors Corp
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Mitsubishi Motors Corp
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Priority to JP2003201793A priority Critical patent/JP4075717B2/en
Priority to KR1020040054301A priority patent/KR100600312B1/en
Priority to DE102004034912A priority patent/DE102004034912B4/en
Priority to CNB2004100545669A priority patent/CN1297739C/en
Publication of JP2005042587A publication Critical patent/JP2005042587A/en
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Publication of JP4075717B2 publication Critical patent/JP4075717B2/en
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    • 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
    • F02B75/00—Other engines
    • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F02B75/18—Multi-cylinder engines
    • F02B75/20—Multi-cylinder engines with cylinders all in one line
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/14—Tappets; Push rods
    • 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
    • F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
    • F02F1/4214—Shape or arrangement of intake or exhaust channels in cylinder heads specially adapted for four or more valves per cylinder
    • 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
    • F02B75/00—Other engines
    • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F02B75/18—Multi-cylinder engines
    • F02B2075/1804—Number of cylinders
    • F02B2075/1812—Number of cylinders three
    • 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

Description

【０００１】
【発明の属する技術分野】
本発明は、バルブのタペットを案内する筒部が設けられたシリンダヘッドに関する。
【０００２】
【従来の技術】
エンジンのシリンダヘッドは、吸気ポートを開閉する吸気バルブと、排気ポートを開閉する排気バルブとを備える。各バルブのステム部は、各ポートに向かって貫通するバルブステムガイドに燃焼室側から摺動可能に挿嵌される。バルブは、ステム端部に装着されたコイルスプリングによってポートを閉じる方向に付勢されている。
【０００３】
コイルスプリングの上を覆うタペットは、バルブと同軸を中心とする筒状の外周壁で形成されたタペット孔に案内されている。この外周壁は、エンジンを軽量化するために壁の厚みを薄く成形している。
【０００４】
エンジンの運転中の温度変化や振動などによりこの周壁が変形することを防止するために、スパークプラグを装着するプラグホールとタペット孔の周壁との間にリブを設けたシリンダヘッドがある（例えば、特許文献１参照。）。このシリンダヘッドは、潤滑油をリブで囲繞される部分に一時貯留し、タペット孔に供給している。
【０００５】
【特許文献１】
実開平４−１０９４０７号公報（段落００１５−００１９、第１図）
【０００６】
【発明が解決しようとする課題】
しかしながら、バルブやタペット、及びその周辺は、エンジンが運転されることによって加熱される。したがって、プラグホールとタペット孔の外周壁との間にリブで囲繞された部分に潤滑油を貯留させると、潤滑油が高温に晒されたまま循環されないため、劣化が早まってしまう。
【０００７】
そこで、本発明は、シリンダヘッド内の潤滑油をタペットの周辺に滞留させずにタペット孔に供給する内燃機関のシリンダヘッド構造を提供することを目的とする。
【０００８】
【課題を解決するための手段】
本発明に係る内燃機関のシリンダヘッド構造は、吸気バルブのタペットをガイドする吸気タペット孔を形成する筒状の吸気タペットガイドと、排気バルブのタペットをガイドする排気タペット孔を形成する筒状の排気タペットガイドと、前記吸気タペット孔と前記排気タペット孔とを横切る面に沿って前記吸気タペットガイドと前記排気タペットガイドとを連結するトッププレートと、前記トッププレートの両側から連続して立ち上がるとともに、前記吸気タペットガイドおよび前記排気タペットガイドに連結されたサイドプレートと、を備えている。
前記トッププレートは、スパークプラグの取付穴が開口する平坦な上面を有し、この上面は、前記吸気タペット孔の内面および前記排気タペット孔の内面に連続している。さらに、前記サイドプレートは、前記取付穴を間に挟んで向かい合うとともに、前記取付穴から離れていることを特徴としている。
【００１０】
また、剛性を高めるために、スパークプラグを取り付けるプラグ取付部を、燃焼室の頂部とトッププレートとを繋いで設ける。
【００１１】
【発明の実施の形態】
本発明に係る一実施形態のシリンダヘッド１について、図１から図３を参照して説明する。図１に示すシリンダヘッド１は、直列３気筒用であって、吸気ポート２及び排気ポート３（図２参照）と吸気タペット孔４と排気タペット孔５とカムシャフト軸受６と燃焼室７とプラグ取付部８とが形成されている。
【００１２】
図２に示すように、吸気タペット孔４は、吸気ポート２側に設けられ、吸気ポート２を開閉する吸気バルブ９、コイルスプリング１６、タペット１８がそれぞれ組み付けられる。排気タペット孔５は、排気ポート３側に設けられ、排気ポート３を開閉する排気バルブ１０、コイルスプリング１６、タペット１８がそれぞれ組み付けられる。
【００１３】
吸気タペット孔４と排気タペット孔５とは、吸気タペットガイドとなる筒状の吸気タペット外周壁１１及び排気タペットガイドとなる筒状の排気タペット外周壁１２でそれぞれ形成されている。吸気タペット孔４と排気タペット孔５は、各シリンダに対してそれぞれ２つずつ設けられている。
【００１４】
図１に示すように、吸気タペット外周壁１１と排気タペット外周壁１２は、吸気タペット孔４と排気タペット孔５とを横切る面に沿って形成されるトッププレート１３によって連結されている。トッププレート１３は、吸気タペット孔４と排気タペット孔５とにそれぞれ連通されている。言い換えれば、トッププレート１３の上面の一部は、吸気タペット孔４の内面と排気タペット孔５の内面とへそれぞれ液溜が生じない程度に滑らかに連続している。また、図３に示すように、シリンダが並ぶ気筒列に沿う方向のトッププレート１３の両側から連続してサイドプレート１４が立ち上がっている。
【００１５】
各バルブ９，１０は、各ポート２，３をそれぞれ開閉する傘部９ａ，１０ａとこの傘部９ａ，１０ａを支持するステム部９ｂ，１０ｂを備える。ステム部９ｂ，１０ｂは、各ポート２，３に設けられたステムガイド１５に燃焼室７側から摺動可能に挿嵌されている。傘部９ａ，１０ａが設けられた側と反対側のステム端部９ｃ，１０ｃには、コイルスプリング１６が外挿され、吸気タペット孔４及び排気タペット孔５に挿嵌されるタペット１８が装着されている。これにより、コイルスプリング１６は、傘部９ａ，１０ａがポート２，３を燃焼室７側から閉じる方向にバルブ９，１０を付勢している。
【００１６】
また、カムシャフト軸受６は、図１に示すように、各シリンダに対応して設けられた吸気タペット孔４同士及び排気タペット孔５同士の間に設けられている。プラグ取付部８は、各シリンダに対応して設けられており、燃焼室７の頂部７ａとトッププレート１３とを繋いで設けられる。したがって、トッププレート１３の中央部には、スパークプラグの取付穴８ａが開口する。隣り合うシリンダの間及び気筒列の両端に相当する部分には、シリンダヘッド１をシリンダブロックに固定するヘッドボルトを挿通するボルト孔１７が設けられている。
【００１７】
以上のように構成されたシリンダヘッド１は、吸気タペット外周壁１１と排気タペット外周壁１２とがトッププレート１３で連結されているので、吸気タペット外周壁１１及び排気タペット外周壁１２が補強される。
【００１８】
さらに、トッププレート１３が平坦に形成されているとともに両側にサイドプレート１４が立ち上がっており、トッププレート１３の上面の一部が吸気タペット孔４の内面及び排気タペット孔５の内面へ滑らかに連続しているので、トッププレート１３上に飛散してきた潤滑油は、滞留することなく吸気タペット孔４と排気タペット孔５との少なくとも低くなっている側に向かって流れる。したがって、潤滑油が加熱されて劣化が早まることが防止される。また、トッププレート１３から吸気タペット孔４及び排気タペット孔５の少なくとも一方へ流れ込むように潤滑油が循環するので、バルブ９，１０及びその周辺が、効率良く冷却される。なお、トッププレート１３は、上面に潤滑油が滞留しない形状であれば良いので、中央部が吸気タペット孔４及び排気タペット孔５よりも高く盛り上がったアーチ形状であっても良い。
【００１９】
また、エンジンが排気ポート３側に傾斜して配置される場合、トッププレート１３上に供給された潤滑油は、トッププレート１３上を排気タペット孔５に流れ込む。排気バルブ１０は、吸気バルブ９よりも高温になりやすいので、積極的に潤滑油が排気タペット孔５側に流れることは、冷却効率の上で好ましい。
【００２０】
なお、本発明は、上述した一実施形態に限定されるものではなく、本発明の主旨を逸脱しない範囲内で種々変更して実施しても構わない。
【００２１】
【発明の効果】
本発明に係る内燃機関のシリンダヘッド構造によれば、トッププレート上に飛散してきた潤滑油は、トッププレートの上面に滞留することなく吸気タペット孔及び排気タペット孔に流れ込むので、シリンダヘッド内の潤滑油をタペットの周辺に滞留させずにタペット孔に供給することができる。その結果、潤滑油の滞留による潤滑油の劣化を防止することができる。
【図面の簡単な説明】
【図１】 本発明に係る一実施形態のシリンダヘッドを示す上面図。
【図２】 図１のシリンダヘッドにそれぞれバルブ、タペット、及びコイルスプリングを取り付けた状態で、図１中のＦ２−Ｆ２に沿って示すシリンダヘッドの断面図。
【図３】 図１中のＦ３で示す部分の斜視図。
【符号の説明】
１…シリンダヘッド、４…吸気タペット孔、５…排気タペット孔、８ａ…取付穴、９…吸気バルブ、１０…排気バルブ、１１…吸気タペットガイド（吸気タペット外周壁）、１２…排気タペットガイド（排気タペット外周壁）、１３…トッププレート、１４…サイドプレート、１８…タペット。 [0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cylinder head provided with a cylindrical portion for guiding a tappet of a valve.
[0002]
[Prior art]
A cylinder head of an engine includes an intake valve that opens and closes an intake port and an exhaust valve that opens and closes an exhaust port. The stem portion of each valve is slidably inserted from the combustion chamber side into a valve stem guide penetrating toward each port. The valve is urged in a direction to close the port by a coil spring attached to the end of the stem.
[0003]
The tappet that covers the coil spring is guided by a tappet hole formed by a cylindrical outer peripheral wall that is coaxial with the valve. The outer peripheral wall is formed with a thin wall thickness in order to reduce the weight of the engine.
[0004]
In order to prevent this peripheral wall from being deformed due to temperature change or vibration during operation of the engine, there is a cylinder head provided with a rib between the plug hole for attaching the spark plug and the peripheral wall of the tappet hole (for example, (See Patent Document 1). This cylinder head temporarily stores lubricating oil in a portion surrounded by a rib and supplies it to the tappet hole.
[0005]
[Patent Document 1]
Japanese Utility Model Publication No. 4-109407 (paragraphs 0015-0019, FIG. 1)
[0006]
[Problems to be solved by the invention]
However, the valves, tappets, and their surroundings are heated when the engine is operated. Therefore, if the lubricating oil is stored in a portion surrounded by a rib between the plug hole and the outer peripheral wall of the tappet hole, the lubricating oil is not circulated while being exposed to a high temperature, so that deterioration is accelerated.
[0007]
Therefore, an object of the present invention is to provide a cylinder head structure for an internal combustion engine that supplies lubricating oil in the cylinder head to the tappet hole without staying around the tappet.
[0008]
[Means for Solving the Problems]
A cylinder head structure of an internal combustion engine according to the present invention includes a cylindrical intake tappet guide that forms an intake tappet hole that guides the tappet of the intake valve, and a cylindrical exhaust that forms an exhaust tappet hole that guides the tappet of the exhaust valve. A tappet guide, a top plate that connects the intake tappet guide and the exhaust tappet guide along a plane that crosses the intake tappet hole and the exhaust tappet hole, and rises continuously from both sides of the top plate , and An intake tappet guide and a side plate connected to the exhaust tappet guide .
The top plate has a flat upper surface through which a spark plug mounting hole is opened, and the upper surface is continuous with the inner surface of the intake tappet hole and the inner surface of the exhaust tappet hole. Further, the side plates face each other with the mounting hole in between, and are separated from the mounting hole.
[0010]
In order to increase the rigidity, a plug mounting portion for attaching the spark plug is provided by connecting the top portion of the combustion chamber and the top plate.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
A cylinder head 1 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3. A cylinder head 1 shown in FIG. 1 is for in-line three cylinders, and includes an intake port 2 and an exhaust port 3 (see FIG. 2), an intake tappet hole 4, an exhaust tappet hole 5, a camshaft bearing 6, a combustion chamber 7, and a plug. A mounting portion 8 is formed.
[0012]
As shown in FIG. 2, the intake tappet hole 4 is provided on the intake port 2 side, and an intake valve 9 that opens and closes the intake port 2, a coil spring 16, and a tappet 18 are assembled to each other. The exhaust tappet hole 5 is provided on the exhaust port 3 side, and an exhaust valve 10 that opens and closes the exhaust port 3, a coil spring 16, and a tappet 18 are assembled to each other.
[0013]
The intake tappet hole 4 and the exhaust tappet hole 5 are respectively formed by a cylindrical intake tappet outer peripheral wall 11 serving as an intake tappet guide and a cylindrical exhaust tappet outer peripheral wall 12 serving as an exhaust tappet guide. Two intake tappet holes 4 and two exhaust tappet holes 5 are provided for each cylinder.
[0014]
As shown in FIG. 1, the intake tappet outer peripheral wall 11 and the exhaust tappet outer peripheral wall 12 are connected by a top plate 13 that is formed along a plane that crosses the intake tappet hole 4 and the exhaust tappet hole 5. The top plate 13 communicates with the intake tappet hole 4 and the exhaust tappet hole 5. In other words, a part of the upper surface of the top plate 13 is smoothly continuous to the inner surface of the intake tappet hole 4 and the inner surface of the exhaust tappet hole 5 to such an extent that no liquid pool is generated. As shown in FIG. 3, the side plate 14 rises continuously from both sides of the top plate 13 in the direction along the cylinder row where the cylinders are arranged.
[0015]
Each of the valves 9 and 10 includes umbrella portions 9a and 10a that open and close the ports 2 and 3, respectively, and stem portions 9b and 10b that support the umbrella portions 9a and 10a. The stem portions 9b and 10b are inserted into stem guides 15 provided at the ports 2 and 3 so as to be slidable from the combustion chamber 7 side. A coil spring 16 is externally attached to the stem end portions 9c and 10c opposite to the side where the umbrella portions 9a and 10a are provided, and a tappet 18 to be inserted into the intake tappet hole 4 and the exhaust tappet hole 5 is mounted. ing. Thereby, the coil spring 16 urges the valves 9 and 10 in such a direction that the umbrella portions 9a and 10a close the ports 2 and 3 from the combustion chamber 7 side.
[0016]
As shown in FIG. 1, the camshaft bearing 6 is provided between the intake tappet holes 4 and the exhaust tappet holes 5 provided corresponding to each cylinder. The plug attachment portion 8 is provided corresponding to each cylinder, and is provided by connecting the top portion 7 a of the combustion chamber 7 and the top plate 13. Therefore, a spark plug mounting hole 8 a is opened at the center of the top plate 13. Bolt holes 17 through which head bolts for fixing the cylinder head 1 to the cylinder block are inserted are provided between adjacent cylinders and at both ends of the cylinder row.
[0017]
In the cylinder head 1 configured as described above, since the intake tappet outer peripheral wall 11 and the exhaust tappet outer peripheral wall 12 are connected by the top plate 13, the intake tappet outer peripheral wall 11 and the exhaust tappet outer peripheral wall 12 are reinforced. .
[0018]
Further, the top plate 13 is formed flat and the side plates 14 are raised on both sides, and a part of the top surface of the top plate 13 is smoothly connected to the inner surface of the intake tappet hole 4 and the inner surface of the exhaust tappet hole 5. Therefore, the lubricating oil scattered on the top plate 13 flows toward at least the lower side of the intake tappet hole 4 and the exhaust tappet hole 5 without stagnation. Therefore, it is prevented that the lubricant is heated and deteriorates rapidly. Further, since the lubricating oil circulates so as to flow from the top plate 13 to at least one of the intake tappet hole 4 and the exhaust tappet hole 5, the valves 9 and 10 and the periphery thereof are efficiently cooled. The top plate 13 may have an arch shape in which the center portion is raised higher than the intake tappet hole 4 and the exhaust tappet hole 5 as long as the lubricant does not stay on the upper surface.
[0019]
Further, when the engine is disposed to be inclined toward the exhaust port 3, the lubricating oil supplied onto the top plate 13 flows into the exhaust tappet hole 5 on the top plate 13. Since the exhaust valve 10 is likely to be hotter than the intake valve 9, it is preferable in terms of cooling efficiency that the lubricating oil actively flows to the exhaust tappet hole 5 side.
[0020]
The present invention is not limited to the above-described embodiment, and various modifications may be made without departing from the spirit of the present invention.
[0021]
【The invention's effect】
According to the cylinder head structure of the internal combustion engine according to the present invention, the lubricating oil scattered on the top plate flows into the intake tappet hole and the exhaust tappet hole without staying on the upper surface of the top plate. The oil can be supplied to the tappet holes without staying around the tappet. As a result, the deterioration of the lubricating oil due to the retention of the lubricating oil can be prevented.
[Brief description of the drawings]
FIG. 1 is a top view showing a cylinder head according to an embodiment of the present invention.
2 is a cross-sectional view of the cylinder head taken along F2-F2 in FIG. 1, with a valve, a tappet, and a coil spring attached to the cylinder head in FIG. 1, respectively.
FIG. 3 is a perspective view of a portion indicated by F3 in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Cylinder head, 4 ... Intake tappet hole, 5 ... Exhaust tappet hole, 8a ... Mounting hole, 9 ... Intake valve, 10 ... Exhaust valve, 11 ... Intake tappet guide (intake tappet outer peripheral wall), 12 ... Exhaust tappet guide ( Exhaust tappet outer peripheral wall), 13 ... top plate, 14 ... side plate, 18 ... tappet.

Claims (2)

吸気バルブのタペットをガイドする吸気タペット孔を形成する筒状の吸気タペットガイドと、
排気バルブのタペットをガイドする排気タペット孔を形成する筒状の排気タペットガイドと、
前記吸気タペット孔と前記排気タペット孔とを横切る面に沿って前記吸気タペットガイドと前記排気タペットガイドとを連結するとともに、スパークプラグの取付穴が開口する平坦な上面を有するトッププレートと、
前記トッププレートの両側から連続して立ち上がるとともに、前記吸気タペットガイドおよび前記排気タペットガイドに連結されたサイドプレートと、を備え、
前記トッププレートの上面は、前記吸気タペット孔の内面および前記排気タペット孔の内面に連続し、前記サイドプレートは、前記取付穴を間に挟んで向かい合うとともに、前記取付穴から離れていることを特徴とする内燃機関のシリンダヘッド構造。 A cylindrical intake tappet guide that forms an intake tappet hole that guides the tappet of the intake valve ;
A cylindrical exhaust tappet guide forming an exhaust tappet hole for guiding the exhaust valve tappet ; and
A top plate having a flat upper surface that connects the intake tappet guide and the exhaust tappet guide along a surface that crosses the intake tappet hole and the exhaust tappet hole, and has an opening for mounting a spark plug .
Together rises continuously from both sides of the top plate, and a side plate connected to the intake tappet guide and the exhaust tappet guide,
An upper surface of the top plate is continuous with an inner surface of the intake tappet hole and an inner surface of the exhaust tappet hole, and the side plates face each other with the mounting hole therebetween and are separated from the mounting hole. A cylinder head structure for an internal combustion engine. 請求項１の記載において、前記吸気タペットガイドと前記排気タペットガイドとの間にプラグ取付部が位置し、このプラグ取付部は、燃焼室の頂部と前記トッププレートとの間を繋いで設けられることを特徴とする内燃機関のシリンダヘッド構造。 The plug attachment portion is located between the intake tappet guide and the exhaust tappet guide according to claim 1, and the plug attachment portion is provided to connect the top portion of the combustion chamber and the top plate. A cylinder head structure for an internal combustion engine.
JP2003201793A 2003-07-25 2003-07-25 Cylinder head structure of internal combustion engine Expired - Fee Related JP4075717B2 (en)

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JP2003201793A JP4075717B2 (en) 2003-07-25 2003-07-25 Cylinder head structure of internal combustion engine
KR1020040054301A KR100600312B1 (en) 2003-07-25 2004-07-13 Cylinder head structure of engine
DE102004034912A DE102004034912B4 (en) 2003-07-25 2004-07-19 Cylinder head structure of an engine
CNB2004100545669A CN1297739C (en) 2003-07-25 2004-07-23 Engine air cylinder head structure

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KR100600312B1 (en) 2006-07-14

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