JPS61142353A - Four valve type engine - Google Patents

Four valve type engine

Info

Publication number
JPS61142353A
JPS61142353A JP26508584A JP26508584A JPS61142353A JP S61142353 A JPS61142353 A JP S61142353A JP 26508584 A JP26508584 A JP 26508584A JP 26508584 A JP26508584 A JP 26508584A JP S61142353 A JPS61142353 A JP S61142353A
Authority
JP
Japan
Prior art keywords
exhaust
cylinder head
engine
spark plug
intake
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP26508584A
Other languages
Japanese (ja)
Other versions
JPH0243025B2 (en
Inventor
Akira Kageyama
明 陰山
Hiroyuki Oda
博之 小田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mazda Motor Corp
Original Assignee
Mazda Motor Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mazda Motor Corp filed Critical Mazda Motor Corp
Priority to JP26508584A priority Critical patent/JPS61142353A/en
Priority to US06/803,606 priority patent/US4714058A/en
Priority to DE19853543443 priority patent/DE3543443A1/en
Publication of JPS61142353A publication Critical patent/JPS61142353A/en
Publication of JPH0243025B2 publication Critical patent/JPH0243025B2/ja
Granted legal-status Critical Current

Links

Classifications

    • 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
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/242—Arrangement of spark plugs or injectors
    • 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
    • F02B1/00—Engines characterised by fuel-air mixture compression
    • F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
    • F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into 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
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/20—SOHC [Single 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

PURPOSE:To enhance the cooling efficiency of ignition plugs in an engine having intake and exhaust valves two in each per engine cylinder, by forming an inclined spark-plug fitting hole between two exhaust ports in a cylinder head, and by forming cooling water drill holes in the vicinity of this fitting hole. CONSTITUTION:In an engine in which intake and exhaust ports 17, 18 two in each are formed in a cylinder head 13 and the opening sections of the ports 17, 18 on the combustion chamber 16 side are closed by intake and exhaust valves 19, 20, an inclined spark-plug fitting hole 36 is formed in the cylinder head 36 between the two exhaust ports 18, crossing the exhaust valve 20. The fitting hole 36 is opened at its front end 36 to the center of top section of the combustion chamber 16. Further, two drill holes 42 are formed crossing each other and extending through the lower deck 38 from cooling water inlet ports 41 formed in the lower deck 38 of the cylinder head 16 at positions below the exhaust ports 18 to a water jacket 40.

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は１気筒について吸、排気弁を各２個備えた４弁
式エンジン、特にこれらの弁を１本の頭上カム軸で駆動
するようにしたエンジンに関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a four-valve engine having two intake and two exhaust valves per cylinder, and particularly to a four-valve engine in which each cylinder has two intake and two exhaust valves, and in particular, a four-valve engine in which each of these valves is driven by one overhead camshaft. Regarding the engine.

（従　　来　　技　　術） 自動車用等のエンジンとして、１気筒について２個の吸
気弁と２ｗＡの排気弁とを備えた４弁式のエンジンが実
用化されている。このエンジンによれば、吸気充填効率
や排気効率が向上して燃焼状態が改善されることにより
、エンジンの高出力化が実現される。一方、吸気弁と排
気弁とを夫々異なるカム軸で駆動するようにした２頭上
カム軸式エンジンが実用化されているが、このエンジン
によれば、動弁機構におけるロッカーアームが廃止され
ることにより、高回転化の妨げとなる往復慣性質量が低
減されてエンジンの高回転化が可能となる。しかし、こ
の２頭上カム軸式エンジンは、構造が箸しく複雑化する
のでコストが高りｆｌり難点がある。(Prior Art) A four-valve engine, which has two intake valves and a 2 wA exhaust valve per cylinder, has been put into practical use as an engine for automobiles and the like. According to this engine, the intake air filling efficiency and the exhaust efficiency are improved, and the combustion state is improved, thereby realizing high output of the engine. On the other hand, a double overhead camshaft engine has been put into practical use in which the intake valve and exhaust valve are driven by different camshafts, but this engine eliminates the rocker arm in the valve mechanism. As a result, the reciprocating inertial mass that hinders high engine speed is reduced, making it possible to increase the engine speed. However, this double overhead camshaft engine has disadvantages such as increased cost and complexity due to its rather complicated structure.

そこで、高出力は必要とされるが、特に高回転を要しな
いエンジンの場合には、１気筒について吸気弁及び排気
弁を夫々２個備えると共に、これらの弁を１本の頭上カ
ム軸で駆動する構造として、所要の出力を確保し且つコ
ストを低減することが考えられるが、このエンジンの場
合、点火プラグの配置ないし該プラグに対する冷却性に
関する次のような問題がある。つまり、１気筒について
吸、排気弁を各２個備える場合、点火プラグによる良好
な着火性や火炎の伝播性等を得るためには、燃焼室に対
して四角形状に配置した４個の弁の中央部に点火プラグ
を配置することが望ましいのであるが、カム軸が１本の
場合は、該カム軸が燃焼室の中央部上方を通過するので
、点火プラグの直上方にカム軸が位置することになる。Therefore, although high output is required, in the case of an engine that does not require particularly high rotation, it is necessary to have two intake valves and two exhaust valves per cylinder, and drive these valves with one overhead camshaft. However, in the case of this engine, there are the following problems regarding the arrangement of the spark plug and the cooling performance for the spark plug. In other words, when each cylinder has two intake and two exhaust valves, in order to obtain good ignition performance and flame propagation with the spark plug, it is necessary to It is desirable to place the spark plug in the center, but if there is only one camshaft, the camshaft passes above the center of the combustion chamber, so the camshaft is located directly above the spark plug. It turns out.

そのため、カム軸が点火プラグの取付は取外しの邪魔と
なってエンジンのサービス性が悪化するのである。Therefore, the camshaft obstructs the installation and removal of the spark plug, deteriorating the serviceability of the engine.

これに対しては、例えば特開昭５７−１０２５０６号公
報に開示されたエンジンがある。このエンジンは、第７
．８図に示すように、１つの燃焼室１について２個の吸
気弁２，２と２個の排気弁３．３とを四角形状に配置し
、且つ燃焼室の中央部上方に１本のカム軸４を配設した
構成において、点火プラグ５を２個の排気弁３．３間に
傾斜状に配置することにより、その先端の着火部５ａを
燃焼ｖ１の中央に位置させると共に、その上部５ｂをカ
ムＩＨＡ４の側方から斜め上方に臨ませたものである。For this purpose, for example, there is an engine disclosed in Japanese Patent Laid-Open No. 57-102506. This engine is the 7th
．． As shown in Fig. 8, two intake valves 2, 2 and two exhaust valves 3.3 are arranged in a square shape for one combustion chamber 1, and one cam is arranged above the center of the combustion chamber. In the configuration in which the shaft 4 is arranged, the ignition plug 5 is arranged in an inclined manner between the two exhaust valves 3.3, so that the ignition part 5a at the tip thereof is located in the center of the combustion v1, and the upper part 5b is viewed diagonally upward from the side of cam IHA4.

これによれば、良好な着火性が得られ、また点火プラグ
５をカム軸４に邪魔されることなく取付は取外しするこ
とが可能となる。また、このエンジンは比較的熱負荷が
小さい単気筒エンジンであるから、点火プラグ５を２個
の排気ポート６゜６間に配置しても、第７図に示すよう
に該プラグ５の上部５ｂを外部に露出させるだけで空気
流によって所要の冷却性が得られる。According to this, good ignitability can be obtained, and the spark plug 5 can be installed and removed without being obstructed by the camshaft 4. Furthermore, since this engine is a single-cylinder engine with a relatively small heat load, even if the spark plug 5 is disposed between the two exhaust ports 6°6, the upper part 5b of the plug 5 as shown in FIG. The required cooling performance can be obtained by simply exposing the air to the outside.

しかし、熱負荷が大きい多気筒エンジンにおいては、上
記のように点火プラグを２個の排気ポート間に配置した
場合、該ポート内を通過する排気ガスから高い熱が点火
プラグに伝わると共に、特に該プラグにおける燃焼室構
成壁に螺合されたオネジ部には燃焼掌側からも高い熱が
伝わって、該オネジ部が熱的に著しく厳しい状態となり
、そのため該プラグが早期に劣化するという問題が生じ
る。However, in a multi-cylinder engine with a large heat load, when the spark plug is placed between two exhaust ports as described above, high heat is transmitted to the spark plug from the exhaust gas passing through the port, and High heat is also transmitted from the combustion palm side to the male threaded part of the plug that is screwed into the wall that constitutes the combustion chamber, putting the male threaded part in an extremely severe thermal condition, which causes the problem of early deterioration of the plug. .

（発　　明　　の　　目　　的） 本発明は４弁１頭上カム軸式エンジンにおける上記のよ
うな実情に対処するもので、点火プラグをシリンダヘッ
ドにおける２個の排気ポート間に傾斜状に配置すること
により、良好な着火性や該プラグに対するサービス性を
確保すると共に、該プラグの特に熱的に厳しいオネジ部
を冷却水により重点的に冷却することを可能として、こ
の種のエンジンにおける点火プラグの熱的劣化を防止す
ることを目的とする。(Object of the Invention) The present invention addresses the above-mentioned situation in a four-valve single overhead camshaft engine by arranging the spark plug in an inclined manner between two exhaust ports in the cylinder head. In addition to ensuring good ignition performance and serviceability for the spark plug, it also makes it possible to intensively cool the male threaded part of the plug, which is particularly thermally severe, with cooling water. The purpose is to prevent deterioration.

（発　　明　　の　　構　　成） 本発明に係る４弁式エンジンは、上記目的達成のため次
のように構成したことを特徴とする。(Structure of the Invention) A four-valve engine according to the present invention is characterized by having the following structure in order to achieve the above object.

即ち、１気筒について２個の吸気弁と２個の排気弁とを
備え、これらの弁を１本の頭上カム軸で駆動するように
した構成において、点火プラグの挿入孔をシリンダヘッ
ドにおける２個の排気ポート間に傾斜状に設けると共に
、シリンダヘッドの燃焼室構成壁における上記挿入孔の
点火プラグ螺合用ネジ穴部と上記排気ポートとの間に冷
却水通路となるキリ穴を穿設する。この穴は、例えばシ
リンダヘッド下面にお番プるシリンダブロック側からの
冷却水入口部から該シリンダヘッド内のウォータージャ
ケットに通じるように穿設され、上記冷却水入口部とウ
ォータージャケット内との圧力差によってシリンダブロ
ックのウォータージャケットから流入した冷却水が該穴
を通過するように設けられる。That is, in a configuration in which each cylinder has two intake valves and two exhaust valves, and these valves are driven by one overhead camshaft, the spark plug insertion hole is inserted into two holes in the cylinder head. At the same time, a perforated hole serving as a cooling water passage is provided between the exhaust port and the threaded hole for threading the ignition plug of the insertion hole in the combustion chamber constituting wall of the cylinder head. This hole is formed, for example, on the bottom surface of the cylinder head so that the cooling water inlet from the cylinder block side connected to the water jacket in the cylinder head is connected to the water jacket inside the cylinder head, and the pressure between the cooling water inlet and the inside of the water jacket is Due to the difference, cooling water flowing from the water jacket of the cylinder block is provided to pass through the hole.

（発　　明　　の　　効　　果） 上記の構成によれば、４弁１頭上カム軸式エンジンにお
いて、点火プラグの先端の着火部が燃焼室の中央に位置
することにより良好な着火性ないし火炎の伝播性等が得
られ、また該点火プラグをカム軸等に邪魔されることな
く取付は取外しすることが可能となると共に、該プラグ
が高温の初見ガスが通過する排気ポート間に配置される
にも拘らず、該プラグの特に熱的に厳しいオネジ部がキ
リ孔を通過する冷却水により重点的に冷却されることに
なる。これにより、この秤のエンジンにおいて、良好な
燃焼性とサービス性とが得られると共に、点火プラグの
熱による早期劣化が防止されることになる。(Effects of the Invention) According to the above configuration, in a four-valve single overhead camshaft engine, the ignition part at the tip of the spark plug is located in the center of the combustion chamber, resulting in good ignition performance and flame propagation. etc., and the spark plug can be installed and removed without being obstructed by the camshaft, etc., and even though the plug is placed between the exhaust ports through which high-temperature gas passes. First, the male threaded portion of the plug, which is particularly thermally severe, is cooled intensively by the cooling water passing through the through hole. As a result, in the engine of this scale, good combustibility and serviceability can be obtained, and early deterioration of the spark plug due to heat can be prevented.

（実　　施　　例） 以下、本発明の実施例について説明する。(Example) Examples of the present invention will be described below.

第１．２図に示すように、エンジン１０は複数のシリン
ダを列状に配置したシリンダブロック１１と、該ブロッ
ク１１の上面にガスケット１２を介して設置されたシリ
ンダヘッド１３とを有し、シリンダブロック１１におけ
るシリンダ１４の内周面と、該シリンダ１４内に嵌合さ
れたピストン１５の上面と、シリンダヘッド１３の上方
に窪まされた下面１３ａとで燃焼室１６が画成されてい
る。また、シリンダヘッド１３には、一方の側面１３ｂ
から上記燃焼ｖ１６に通じる２つの吸気ポート１７．１
７と、他方の側面１３０から燃焼室１６に通じる２つの
排気ポート１８．１８とが設けられ、これら各ポートの
燃焼室１６への開口部１７ａ、１７ａ、１８ａ、１８ａ
がシリンダヘッド下面１３ａに四角形状に配設されてい
ると共に、各開口部１７ａ、１７ａ、１８ａ、−１８ａ
を夫々開閉する２個の吸気弁１９．１９と２個の排気弁
２０．２０とが備えられている。そして、これら多弁の
上方に延びるステム部１９ａ、１９ａ、２Ｏａ、２０ａ
はシリンダヘッド１３の上面１３ｄから上方に突出され
、その上端部に夫々固着されたスプリングリテーナ２１
，２１．２２．２２と、シリンダヘッド１３の上面１３
ｄにおける各ステム部１９ａ　、１９ａ　、２０ａ　、
２０ａの突出部に形成されたスプリングシート部２３．
２３，２４゜２４との間には、各バルブ１９．１９．２
０．２０を夫々閉方向に付勢するバルブスプリング２５
゜２５．２６．２６が＠着されている。As shown in FIG. 1.2, the engine 10 has a cylinder block 11 in which a plurality of cylinders are arranged in a row, and a cylinder head 13 installed on the upper surface of the block 11 via a gasket 12. A combustion chamber 16 is defined by the inner peripheral surface of the cylinder 14 in the block 11, the upper surface of the piston 15 fitted in the cylinder 14, and the lower surface 13a recessed above the cylinder head 13. The cylinder head 13 also has one side surface 13b.
Two intake ports 17.1 leading from to the above combustion v16
7 and two exhaust ports 18.18 leading into the combustion chamber 16 from the other side 130, each of which has an opening 17a, 17a, 18a, 18a into the combustion chamber 16.
are arranged in a rectangular shape on the lower surface 13a of the cylinder head, and each opening 17a, 17a, 18a, -18a
Two intake valves 19.19 and two exhaust valves 20.20 are provided, which open and close the intake valves, respectively. Stem portions 19a, 19a, 2Oa, 20a extending above these valves
are spring retainers 21 that protrude upward from the upper surface 13d of the cylinder head 13 and are fixed to their respective upper ends.
, 21, 22, 22 and the upper surface 13 of the cylinder head 13.
Each stem portion 19a, 19a, 20a,
Spring seat portion 23 formed on the protruding portion of 20a.
Between 23 and 24°24, each valve 19.19.2
Valve springs 25 each bias 0.20 in the closing direction.
゜25.26.26 is @ arrived.

一方、シリンダヘッド１３の上部中央における上記吸気
弁１９．１９と排気弁２０．２０とに挾まれた位置には
、エンジン１０のクランク軸方向に延びる１本のカム軸
２７が配設されている。このカム軸２７のジャーナル部
２７ａ・・・２７ａは、第１図及び第３図に示すように
シリンダヘッド１３の上面中央部における隣接気筒間及
びヘッド両端部に立設された軸受壁２８・・・２８と、
各軸グご冑２８・・・２８に夫々２本のボルト２９．２
９を用いて固着された軸受キャップ３０・・・３０とで
形成された軸受孔によって回転自在に軸承されていると
共に、該カム軸２７における隣接ジャーナル部２７８．
２７ａ間には、１気筒分の２個の吸気カム２７ｂ、２７
ｂと２個の排気カム２７ｃ、２７ｃとが形成されている
。そして、該カム軸２７の上部両側には２本のロッカー
アーム軸３１．３２が平行に架設されていると共に、こ
れらの軸３１゜３２に１気筒について各２個の吸気弁用
ロッカーアーム３３．３３及び排気弁用ロッカーアーム
３４．３４が揺動自在に支持さ、れ、各ロッカーアーム
３３．３３．３４．３４の両端が対応するカム２７ｂ　
、２７ｂ　、２７ｃ　、２７ｃの周面と吸排気弁のステ
ム部１９ａ　、１９ａ　、２０ａ　、２０ａの上端とに
夫々対接されていることにより、クランク軸に同期する
カム軸２７の回転によって該ロッカーアーム３３，３３
．３４．３４を介して多弁１９．１９．２０．’２０が
所定のタイミングで開動されるようになっている。ここ
で、上記ロッカーアーム軸３１．３２は軸受キャップ３
０・・・３０の上面に押え部材３５・・・３５を用いて
上記ボルト２９・・・２９により固着されている。On the other hand, a single camshaft 27 extending in the direction of the crankshaft of the engine 10 is disposed at a position sandwiched between the intake valve 19.19 and the exhaust valve 20.20 at the center of the upper part of the cylinder head 13. . As shown in FIGS. 1 and 3, the journal portions 27a...27a of the camshaft 27 are provided with bearing walls 28...・28 and
Two bolts 29.2 for each shaft shaft 28...28
9, and the adjacent journal portions 278.
Between 27a are two intake cams 27b and 27 for one cylinder.
b and two exhaust cams 27c, 27c are formed. Two rocker arm shafts 31 and 32 are installed in parallel on both sides of the upper part of the camshaft 27, and two intake valve rocker arms 33. 33 and exhaust valve rocker arms 34, 34 are swingably supported, and both ends of each rocker arm 33, 33, 34, 34 are connected to a corresponding cam 27b.
, 27b, 27c, and 27c are in contact with the upper ends of the stem portions 19a, 19a, 20a, and 20a of the intake and exhaust valves, respectively, so that the rocker arm is rotated by rotation of the camshaft 27 in synchronization with the crankshaft. 33, 33
．． Multivalve 19.19.20 through 34.34. '20 is designed to open and move at a predetermined timing. Here, the rocker arm shaft 31, 32 is connected to the bearing cap 3.
0...30 are fixed by the bolts 29...29 using presser members 35...35.

また、シリンダヘッド１３には点火プラグ挿入孔３６が
設けられ、該孔３６内に点火プラグ３７が装着されてい
る。この挿入孔３６は、各気筒における２個の排気ポー
ト１８．１８間において排気弁２０．２０に交差するよ
うに傾斜状に設けられ、その先端部３６ａがシリンダヘ
ッド１３の下面１３ａにおける各ポートの間口部１７ａ
、’１７ａ　、１８ａ　、１８ａに囲まれた位置、即ち
燃焼室１６の上部中央に間口されていると共に、該孔３
６の後端部３６ｂは、シリンダヘッド１３の一側面１３
ｃにおける排気ポート１８．１８の後端開口部１８１）
、１８ｂと、該ヘッド１３の上面１３ｄにおける初見弁
２０．２０のスプリングシート部２４．２４との間から
該ヘッド１３の上部外側方を臨むように間口されている
。そして、該挿入孔３６の先端部３６ａに続く部分はメ
ネジ部３６Ｃとされ、該メネジ部３６ｃに点火プラグ３
７のオネジ部３７ａを螺合した時に該プラグ先端の着火
部３７１）が燃焼室１６の上部中央に突出するようにな
っている。Further, a spark plug insertion hole 36 is provided in the cylinder head 13, and a spark plug 37 is installed in the hole 36. The insertion hole 36 is provided in an inclined manner so as to intersect the exhaust valve 20.20 between the two exhaust ports 18.18 in each cylinder, and its tip 36a is connected to each port on the lower surface 13a of the cylinder head 13. Frontage part 17a
, '17a, 18a, and 18a, that is, the opening is at the center of the upper part of the combustion chamber 16, and the hole 3
The rear end portion 36b of 6 is connected to one side surface 13 of the cylinder head 13.
Rear end opening 181 of exhaust port 18.18 at c)
, 18b and the spring seat portion 24.24 of the sight valve 20.20 on the upper surface 13d of the head 13 so as to face the upper outer side of the head 13. A portion of the insertion hole 36 following the tip 36a is a female threaded portion 36C, and the spark plug 3 is attached to the female threaded portion 36c.
When the male screw portion 37a of No. 7 is screwed together, the ignition portion 371) at the tip of the plug protrudes into the upper center of the combustion chamber 16.

然して、第１．２図及び第４．５図に示すように、上記
シリンダヘッド１３のロアデツキ３８における排気ポー
ト１８．１８の下方位置には、シリンダブロック１１の
ウォータージャケット３９から該ヘッド１３内のウォー
タージャケット４０に冷却水を流入させる冷却水入口４
１．４１が形成されていると共に、この冷却水入口４１
．４１からロアデツキ３８内を貫通して上記ウォーター
ジャケット４０に通じる２本のキリ穴４２．４２が穿設
されている。これらのキリ穴４２．４２は、第４図に示
すように図面上、上方の冷却水人口４１１から穿設され
た穴４２１は点火プラグ挿入孔３６と図面上、下方の排
気ポート１８２との間を通過し、また図面上、下方の冷
却水人口４１２から穿設された穴４２２は点火プラグ挿
入孔３６と図面上、上方の排気ポート１８１との間を通
過して、互いに交差するように設けられている。そのた
め、第４図に示すロアデツキ３８の断面において、点火
プラグ挿入孔３６のメネジ部３６ｃが２本のキリ穴４２
．４２によって２個の排気ポート１８．１８から仕切ら
れた状態となっている。ここで、該キリ穴４２．４２は
、第４図に示すようにドリルＡによってシリンダヘッド
１３の下方から冷却水入口４１．４１を介して穿設する
ことができるように位ｔや方向が設定されている。また
、排気ポート１８．１８の近傍を通過する箇所では、該
ポート１８．１８に貫通することを避ける！こめポート
１８．１８内に突出する肉盛り部４３．４３が設けられ
ている。この肉盛り部４３．４３は、その突出部におい
て排気ポート１８．１８の通路断面積を若干狭くするが
、排気効率は主として排気ポートの燃焼室への開口面積
によって定まるので、該肉盛り部４３．４３によって排
気効率が悪化することはない。However, as shown in FIGS. 1.2 and 4.5, the lower deck 38 of the cylinder head 13 is located below the exhaust port 18.18 from the water jacket 39 of the cylinder block 11. Cooling water inlet 4 that allows cooling water to flow into the water jacket 40
1.41 is formed, and this cooling water inlet 41
．． Two drill holes 42 and 42 are drilled from 41 through the inside of the lower deck 38 to communicate with the water jacket 40. As shown in FIG. 4, these drilled holes 42, 42 are located between the spark plug insertion hole 36 and the exhaust port 182, which is located lower in the drawing. A hole 422 bored from the cooling water port 412 on the lower side in the drawing passes between the spark plug insertion hole 36 and the exhaust port 181 on the upper side in the drawing, and is provided so as to intersect with each other. It is being Therefore, in the cross section of the lower deck 38 shown in FIG.
．． 42 from the two exhaust ports 18 and 18. Here, the location and direction of the drill holes 42.42 are set so that they can be drilled from below the cylinder head 13 via the cooling water inlet 41.41 with a drill A as shown in FIG. has been done. Also, avoid penetrating into the exhaust port 18.18 at locations that pass near the exhaust port 18.18! A built-up portion 43.43 is provided that projects into the fill port 18.18. This built-up portion 43.43 slightly narrows the passage cross-sectional area of the exhaust port 18.18 at its protruding portion, but since the exhaust efficiency is mainly determined by the opening area of the exhaust port to the combustion chamber, the built-up portion 43. .43 does not deteriorate exhaust efficiency.

また、この実施例においては、第６図に示すように、シ
リンダヘッド１３におけるウォータージャケット４０内
において、上記点火プラグ挿入孔３６の構成壁４４と、
２個の排気ポート１８．１８の構成壁４５．４５とが分
離されて、これらの構成１！ｌ！４４，４５．４５間に
通路４６．４６が設けられ、上記冷部水入口４１．４１
からウォータージャケット４０内に流入した冷却水が、
矢印Ｘで示すように上記各構成壁４４，４５．４５間の
通路４６．４６を通過するようになっている。Further, in this embodiment, as shown in FIG. 6, in the water jacket 40 of the cylinder head 13, the constituent wall 44 of the spark plug insertion hole 36,
The configuration walls 45.45 of the two exhaust ports 18.18 are separated to form these configurations 1! l! A passage 46.46 is provided between 44 and 45.45, and a passage 46.46 is provided between the cold section water inlet 41.41.
The cooling water flowing into the water jacket 40 from
As shown by the arrow X, it passes through a passage 46.46 between the constituent walls 44, 45.45.

上記の構成によれば、シリンダヘッド１３の上部中央に
配置した１本のカム軸２７によって１気筒について各２
個備えられた吸気弁１９．１９及び排気弁２０．２０を
駆動するようにしたエンジン１０において、点火プラグ
３７の先端の着火部３７ｂが燃焼室１６の中央に位置す
ることになって、該燃焼室１６内における混合気の着火
や火炎の伝播が良好に行われることになる。これにより
、良好な燃焼状態が１がられ、各２個の吸、排気弁１９
．１９．２０．２０を設けたことによる吸排気効率の向
上と相俟って、優れた出力性能と、良好な燃費及び排気
性能とが得られることになる。According to the above configuration, one camshaft 27 disposed at the center of the upper part of the cylinder head 13 provides two camshafts for each cylinder.
In the engine 10 configured to drive the intake valves 19, 19 and exhaust valves 20, 20, which are individually provided, the ignition part 37b at the tip of the spark plug 37 is located in the center of the combustion chamber 16, so that the combustion The ignition of the air-fuel mixture and the propagation of flame within the chamber 16 will be performed satisfactorily. As a result, a good combustion condition is maintained, and each of the two intake and exhaust valves 19
．． Coupled with the improvement in intake and exhaust efficiency due to the provision of 19.20.20, excellent output performance, good fuel efficiency and exhaust performance can be obtained.

また、上記点火プラグ挿入孔３６の後端部３６ｂがシリ
ンダヘッド１３の側面１３０における排気ポート１８．
１８の後端開口部１８ｂ・、１８ｂと排気弁２０．２０
のスプリングシート部２４゜２４との間に開口されてい
るので、上記点火プラグ３７をシリンダヘッド１３の当
該側部における排気弁用動弁機構の外側から該動弁線溝
やカム軸２７に邪魔されることなく、取付は取外しする
ことが可能となり、これにより当該エンジン１０の優れ
たサービス性が得られることになる。Further, the rear end 36b of the spark plug insertion hole 36 is connected to the exhaust port 18 on the side surface 130 of the cylinder head 13.
18 rear end opening 18b, 18b and exhaust valve 20.20
Since the spark plug 37 is opened between the valve line groove and the camshaft 24 from the outside of the exhaust valve valve mechanism on the side of the cylinder head 13, The engine 10 can be installed and removed without being damaged, thereby providing excellent serviceability of the engine 10.

然して、上記のように点火プラグ３７を排気ポート１８
．１８間に配設した場合は、該ポート１８．１８内を通
過する＾渇の排気ガスの熱が点火プラグ３７に伝わるこ
とになる。特に、該プラグ３７における燃焼室１６に面
するロアデツキ３８に螺合されたオネジ部３７ａは燃焼
室１６からも熱を受けて熱的に著しく厳しい状態となる
。しかし、上記の構成によれば、ロアデツキ３８におけ
る点火プラグ挿入孔３６のメネジ部３６ｃと排気ポート
１８．１８との間にキリ穴４２．４２が穿設されて、該
穴４２．４２によって上記メネジ部３６ｃが排気ポート
１８．１８から仕切られた状態となっていると共に、シ
リンダブロック１１のウォータージャケット３９から冷
却水人口４１゜４１に流入した低温の冷却水が圧力差に
よって上記キリ穴４２．／１２を通ってシリンダヘッド
１３のウォータージャケラ１〜４０側に通過する。その
ため、上記メネジ部３６ｃに螺合された点火プラグ３７
のオネジ部３７ａがこの冷却水によって重点的に冷却さ
れることになる。これにより、点火プラグ３７の特に熱
的に厳しいオネジ部３７ａが効果的に冷却され、該プラ
グ３７が高温の排気ガスが通過する排気ポート１８．１
８間に配設されているにも拘らず、該プラグ３７の熱的
劣化が防止される。However, as mentioned above, the spark plug 37 is connected to the exhaust port 18.
．． If the spark plug 37 is disposed between the ports 18 and 18, the heat of the exhaust gas passing through the ports 18 and 18 will be transmitted to the spark plug 37. In particular, the male screw portion 37a of the plug 37, which is screwed into the lower deck 38 facing the combustion chamber 16, receives heat from the combustion chamber 16 as well, resulting in an extremely severe thermal condition. However, according to the above configuration, a drilled hole 42.42 is bored between the female threaded portion 36c of the spark plug insertion hole 36 in the lower deck 38 and the exhaust port 18.18, and the hole 42.42 allows the female screw The portion 36c is partitioned off from the exhaust port 18.18, and the low-temperature cooling water flowing from the water jacket 39 of the cylinder block 11 into the cooling water port 41.41 flows through the through hole 42. /12 and passes to the water jackets 1 to 40 side of the cylinder head 13. Therefore, the spark plug 37 screwed into the female threaded portion 36c
The male threaded portion 37a is primarily cooled by this cooling water. As a result, the male threaded portion 37a of the spark plug 37, which is particularly thermally severe, is effectively cooled, and the plug 37 is connected to the exhaust port 18.1 through which high-temperature exhaust gas passes.
Although the plug 37 is disposed between the plugs 37 and 8, thermal deterioration of the plug 37 is prevented.

また、この実施例においては、ウォータージャケット４
０内における排気ポート１８．１８の構成壁４５．４５
と点火プラグ挿入孔３６の構成壁４４との間に通路４６
．４６が形成されているため、該通路４６．４６を通過
するウォータージャケット４０内の冷却水により、上記
点火プラグ挿入孔３６の構成壁４４を介して点火プラグ
３７が冷却されることになる。これにより、該プラグ３
７の熱的劣化が一層効果的に防止される。In addition, in this embodiment, the water jacket 4
Constituent wall 45.45 of exhaust port 18.18 in 0
A passage 46 between the wall 44 of the spark plug insertion hole 36 and the wall 44 of the spark plug insertion hole 36
．． 46, the spark plug 37 is cooled by the cooling water in the water jacket 40 passing through the passage 46.46 through the wall 44 of the spark plug insertion hole 36. As a result, the plug 3
Thermal deterioration of No. 7 is more effectively prevented.

【図面の簡単な説明】[Brief explanation of the drawing]

第１〜６図は本発明の実施例を示すもので、第１図は燃
焼室の中央で切断したシリンダヘッド及びその周辺の縦
断正面図、第２図は第１図■−■線で切断したシリンダ
ヘッド単体の横断平面図、第３図は動弁機構の平面図、
第４図は第１図ＩＶ　−ＩＶ線で切断した要部横断面図
、第５図は第２図Ｖ−Ｖ線で切断した要部縦断面図、第
６図は第１図■−■線で切断した縦断面図である。第７
．８図は従来例を示すシリンダヘッド及びその周辺の縦
断正面図及び横断平面図である。 １３・・・シリンダヘッド、１６・・・燃焼室、１８・
・・排気ポート、３６・・・挿入孔、３６Ｃ・・・ネジ
穴部（メネジ部）、３７・・・点火プラグ、３８・・・
燃焼室構成壁（ロアデツキ）、４２・・・キリ穴。 第７図 第８図Figures 1 to 6 show examples of the present invention. Figure 1 is a longitudinal sectional front view of the cylinder head and its surroundings cut at the center of the combustion chamber, and Figure 2 is a cut along the line ■-■ in Figure 1. Figure 3 is a cross-sectional plan view of the single cylinder head, and Figure 3 is a plan view of the valve mechanism.
Figure 4 is a cross-sectional view of the main part taken along line IV-IV in Figure 1, Figure 5 is a longitudinal cross-sectional view of the main part taken along line V-V in Figure 2, and Figure 6 is a cross-sectional view of the main part taken along line IV-IV in Figure 1. It is a longitudinal cross-sectional view taken along a line. 7th
．． FIG. 8 is a longitudinal sectional front view and a lateral plan view of a cylinder head and its surroundings, showing a conventional example. 13... Cylinder head, 16... Combustion chamber, 18.
...Exhaust port, 36...Insertion hole, 36C...Threaded hole (female thread), 37...Spark plug, 38...
Combustion chamber configuration wall (lower deck), 42...drill hole. Figure 7 Figure 8

Claims (1)

【特許請求の範囲】[Claims] （１）１気筒について２個の吸気弁と２個の排気弁とを
備え、これらの弁を１本の頭上カム軸で駆動するように
したエンジンにおいて、点火プラグの挿入孔をシリンダ
ヘッドにおける２個の排気ポート間に傾斜状に設けると
共に、該シリンダヘッドの燃焼室構成壁における上記挿
入孔の点火プラグ螺合用ネジ穴部と上記排気ポートとの
間に冷却水通路となるキリ穴を穿設したことを特徴とす
る４弁式エンジン。(1) In an engine that has two intake valves and two exhaust valves per cylinder, and these valves are driven by one overhead camshaft, the spark plug insertion hole is inserted into two holes in the cylinder head. At the same time, a through hole is provided to serve as a cooling water passage between the threaded hole for threading the ignition plug of the insertion hole in the combustion chamber constituting wall of the cylinder head and the exhaust port. A 4-valve engine with the following features.
JP26508584A 1984-12-10 1984-12-14 Four valve type engine Granted JPS61142353A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP26508584A JPS61142353A (en) 1984-12-14 1984-12-14 Four valve type engine
US06/803,606 US4714058A (en) 1984-12-10 1985-12-02 Spark-ignited internal combustion engine
DE19853543443 DE3543443A1 (en) 1984-12-10 1985-12-09 FOREIGN IGNITION ENGINE

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP26508584A JPS61142353A (en) 1984-12-14 1984-12-14 Four valve type engine

Publications (2)

Publication Number Publication Date
JPS61142353A true JPS61142353A (en) 1986-06-30
JPH0243025B2 JPH0243025B2 (en) 1990-09-26

Family

ID=17412387

Family Applications (1)

Application Number Title Priority Date Filing Date
JP26508584A Granted JPS61142353A (en) 1984-12-10 1984-12-14 Four valve type engine

Country Status (1)

Country Link
JP (1) JPS61142353A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0894956A2 (en) * 1997-08-01 1999-02-03 C.R.F. Società Consortile per Azioni Spark-ignition internal combustion engine having a combustion chamber provided with three valves and a central spark-plug
JP2008095616A (en) * 2006-10-13 2008-04-24 Honda Motor Co Ltd Water jacket for cylinder head
US20140238319A1 (en) * 2013-02-26 2014-08-28 Mclaren Automotive Limited Engine cooling
CN110454293A (en) * 2018-05-08 2019-11-15 丰田自动车株式会社 Cylinder head for internal combustion engine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4200379B2 (en) * 2004-10-12 2008-12-24 三菱自動車エンジニアリング株式会社 Engine cooling channel structure

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56127846U (en) * 1980-02-29 1981-09-29
JPS56171649U (en) * 1980-05-22 1981-12-18
JPS5814438U (en) * 1981-07-23 1983-01-29 株式会社小松製作所 internal combustion engine
JPS5912861A (en) * 1982-07-13 1984-01-23 Sumitomo Bakelite Co Ltd Wire guide for wire dot printer
JPS6347898A (en) * 1986-08-15 1988-02-29 株式会社日立製作所 Operation system and apparatus for cash transaction
JPS6410426U (en) * 1987-07-09 1989-01-19

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5814438B2 (en) * 1975-12-27 1983-03-18 タイホウヤクヒンコウギヨウ カブシキガイシヤ Pyrazolopyridine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56127846U (en) * 1980-02-29 1981-09-29
JPS56171649U (en) * 1980-05-22 1981-12-18
JPS5814438U (en) * 1981-07-23 1983-01-29 株式会社小松製作所 internal combustion engine
JPS5912861A (en) * 1982-07-13 1984-01-23 Sumitomo Bakelite Co Ltd Wire guide for wire dot printer
JPS6347898A (en) * 1986-08-15 1988-02-29 株式会社日立製作所 Operation system and apparatus for cash transaction
JPS6410426U (en) * 1987-07-09 1989-01-19

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0894956A2 (en) * 1997-08-01 1999-02-03 C.R.F. Società Consortile per Azioni Spark-ignition internal combustion engine having a combustion chamber provided with three valves and a central spark-plug
EP0894956A3 (en) * 1997-08-01 1999-11-03 C.R.F. Società Consortile per Azioni Spark-ignition internal combustion engine having a combustion chamber provided with three valves and a central spark-plug
JP2008095616A (en) * 2006-10-13 2008-04-24 Honda Motor Co Ltd Water jacket for cylinder head
US20140238319A1 (en) * 2013-02-26 2014-08-28 Mclaren Automotive Limited Engine cooling
US9447748B2 (en) * 2013-02-26 2016-09-20 Mclaren Automotive Limited Cylinder head with cooling channel
CN110454293A (en) * 2018-05-08 2019-11-15 丰田自动车株式会社 Cylinder head for internal combustion engine

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