JPS5996405A - Overhead cam shaft type four-valve engine - Google Patents

Overhead cam shaft type four-valve engine

Info

Publication number
JPS5996405A
JPS5996405A JP20447082A JP20447082A JPS5996405A JP S5996405 A JPS5996405 A JP S5996405A JP 20447082 A JP20447082 A JP 20447082A JP 20447082 A JP20447082 A JP 20447082A JP S5996405 A JPS5996405 A JP S5996405A
Authority
JP
Japan
Prior art keywords
engine
cam
valve
valves
rocker arm
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
JP20447082A
Other languages
Japanese (ja)
Other versions
JPH0578641B2 (en
Inventor
Atsushi Onoki
淳 小野木
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.)
Yamaha Motor Co Ltd
Original Assignee
Yamaha Motor Co Ltd
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 Yamaha Motor Co Ltd filed Critical Yamaha Motor Co Ltd
Priority to JP20447082A priority Critical patent/JPS5996405A/en
Publication of JPS5996405A publication Critical patent/JPS5996405A/en
Publication of JPH0578641B2 publication Critical patent/JPH0578641B2/ja
Granted legal-status Critical Current

Links

Classifications

    • 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
    • F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-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
    • F02F1/42—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
    • 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)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

PURPOSE:To miniaturize an engine, by making a rocker arm independent at every valve, while molding a cam case solidly with a cylinder in one together with a cover, in case of such an engine that has each of plural suction and exhaust valves per cylinder. CONSTITUTION:Two suction valves 4 and exhaust valves each are installed in one combustion chamber 2 and driven by a cam shaft 10 installing each valve in a cam case 18 on top of the combustion chamber 2 via rocker arms 8 and 9. Each of shafts 8a and 9a of these rocker arms 8 and 9 is made up separately at every suction and exhaust valve whereby the cam case 15 is solidly unified with a cylinder head 1 together with a cover. According to this method, the space required for a bolt securing the cover of the cam case is no longer necessary, so that even in case an engine is of small piston displacement and even these rocker arms are made independent together with its shafts totaling four pieces, they are easy to be incorporated in the cam case 15, and, what is more, one rocker arm does not operate two valves at all so that this method may contribute to a distinct improvement in engine performance.

Description

【発明の詳細な説明】 本発明は燃焼室に２個づつの＠気弁と排気弁とを設けた
頭上カム軸式４バルブエンジンに関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an overhead camshaft type four-valve engine in which a combustion chamber is provided with two @air valves and two exhaust valves.

＠見好と排気弁とを２個づつ４バルブ設け、この４バル
ブを燃焼室上方のカム室に横設され（１） たカム軸によりロッカアームを介して駆動するようにし
た所謂頭上カム軸式４バルブエンジンは、吸気の充填効
率を上げることができるためｘｉ用エンジンとして優れ
ている。この頭上カム軸式４バルブエンジンは一般に４
本の口・ンカアームを必要とするため、このロッカアー
ムを収容するためのカム室の容積は２バルブの壜台に比
較してかなり広くすることが必要である。The so-called overhead camshaft type has 4 valves (2 miko and 2 exhaust valves each), and these 4 valves are driven via a rocker arm by a camshaft installed horizontally in a cam chamber above the combustion chamber (1). The 4-valve engine is excellent as an xi engine because it can increase intake air filling efficiency. This overhead camshaft 4-valve engine generally has 4 valves.
Since a book opening and a linker arm are required, the volume of the cam chamber for accommodating this rocker arm needs to be considerably larger than that of a two-valve bottle stand.

ところで、例えば２５０ｃｃ以下の比較的小排気量の頭
１カム軸式エンジンに上記４バルブを採用するときは、
エンジン頭部のカム室容積が小さいため、４本のロッカ
アームが占める１ｇ積を小さくするように、対をなす吸
排気弁に対応する２本づつのロッカアーム苺にロッカア
ーム軸を共通に一体化させるようにししいる。しかし、
２本のロッカアームが一体であることは、それだけ装置
が増大してカム軸に対する追従性を悪＜シ、またバルブ
タイミングをずらせるような細かな調整をすることが不
可能となり、エンジンの扁性能化にはマイナスになる。By the way, when using the above four valves in a relatively small engine with a single head camshaft of 250cc or less, for example,
Since the volume of the cam chamber in the engine head is small, in order to reduce the 1g area occupied by the four rocker arms, the rocker arm shaft is commonly integrated into two rocker arms corresponding to each pair of intake and exhaust valves. Nishishiiru. but,
The fact that the two rocker arms are integrated means that the number of devices increases, which impairs the ability to follow the camshaft, and makes it impossible to make fine adjustments such as shifting the valve timing, which impairs engine performance. It will be negative for the change.

（２） 本発明の目的は、性能を向上した小排気量の頭上カム軸
式４バルブエンジンを提供せんとするものである。(2) An object of the present invention is to provide a small displacement overhead camshaft four-valve engine with improved performance.

上記目的を３ｔＪｌｉする本発明は、シリンダヘッドの
下面に形成した燃焼室に２個づづの吸気弁と排気弁とを
それぞれ設け、前記吸気弁と排気弁の８弁軸端を燃焼室
上方のカム室に設けたカム軸によりロッカアームを介し
て駆−力するようにしたエンジンにおいて、前記ロッカ
アームのロッカアーム軸を８吸排気弁ごとに独立横疲し
、かつ前記カム室をこのカム室をツうカバーと共に前記
シリンダヘッドと一体に成形したことを特徴とするもの
である。The present invention, which achieves the above object by 3tJli, provides two intake valves and two exhaust valves in the combustion chamber formed on the lower surface of the cylinder head, and connects the ends of the eight valve shafts of the intake valve and the exhaust valve to a cam above the combustion chamber. In an engine in which driving force is applied via a rocker arm by a camshaft provided in a chamber, the rocker arm shaft of the rocker arm is independently laterally fatigued for every eight intake and exhaust valves, and the cam chamber is covered with a cover that connects the cam chamber. It is also characterized in that it is molded integrally with the cylinder head.

以下、本発明を図に示す実施例により説明する。The present invention will be explained below with reference to embodiments shown in the drawings.

図において、１はシリンダヘッドで、このシリンダヘッ
ド１の下面側には図示しないシリンダに連なるｆ！Ａ焼
室２が形成されている。３は点火栓であり、シリンダヘ
ッド２を斜めに貫通して一端を外部に露出させると共に
、その発火部（３） ３ａを燃焼室２の中心Ｃに位菅させている。燃焼室２の
上面には、それぞれ２個づつの吸気弁４．４と排気弁５
，５とが設けられている。In the figure, 1 is a cylinder head, and f! is connected to a cylinder (not shown) on the lower surface side of the cylinder head 1. A baking chamber 2 is formed. Reference numeral 3 denotes an ignition plug, which penetrates the cylinder head 2 diagonally to expose one end to the outside, and has its ignition part (3) 3a positioned at the center C of the combustion chamber 2. On the upper surface of the combustion chamber 2, there are two intake valves 4.4 and two exhaust valves 5, respectively.
, 5 are provided.

１５は燃焼室２の上方に設けられたカム室である。この
カム室１５は、カム室上部をりうカバー１８と共にシリ
ンダヘッド１と一体に鋳造成形されている。このカム室
１５内に２本の棒軸６，７が平行に設けられ、一方の棒
軸６には互いに独立のロッカアーム軸８ａ、８ａが回１
可能に軸支され、８０ツカアーム軸８ａ、８ａに一体の
ロッカアーム８．８の端部は吸気弁４゜４の弁軸４ａ、
４ａ端部に対応している。また他方の棒軸７には互いに
ロッカアーム軸９ａ。15 is a cam chamber provided above the combustion chamber 2. The cam chamber 15 is cast integrally with the cylinder head 1 together with a cover 18 that extends over the cam chamber. Two rod shafts 6 and 7 are provided in parallel in this cam chamber 15, and one rod shaft 6 has rocker arm shafts 8a and 8a that are independent of each other.
The end of the rocker arm 8.8, which is pivotably supported and integral with the 80-pin arm shaft 8a, 8a, is connected to the valve shaft 4a of the intake valve 4°4,
4a end. Further, the other rod shaft 7 is provided with a rocker arm shaft 9a.

９ａが回動可能に軸支され、８０ツカアーム軸９ａ、９
ａに一体のロッカアーム９．９の端部は排気弁５．５の
弁軸５ａ’ｐ５ａの端部に対応している。9a is rotatably supported, and 80 arm shafts 9a, 9
The end of the rocker arm 9.9 integral with a corresponds to the end of the valve shaft 5a'p5a of the exhaust valve 5.5.

また、カム室１５内の中央にはカム軸１０が貫Ｉ１１シ
てシリンダヘッド１に軸支されており、カム室１５外に
突出した軸端に固定のスブロケ（４） ット１１を介し、図示しないクランク軸から動力を入力
するようにしている。カム軸１０にはカム１２．１２．
１３．１３がそれぞれ固定され、このうちカム１２．１
２にはロッカアーム８．８の端部が接触し、またカム１
３．１３にはロッカアーム９．９の端部が接触している
。In addition, a cam shaft 10 is rotatably supported by the cylinder head 1 through a through hole I11 in the center of the cam chamber 15, and a fixed slot holder (4) is attached to the shaft end protruding outside the cam chamber 15 via a slot 11. Power is input from a crankshaft (not shown). The camshaft 10 has cams 12.12.
13.13 are respectively fixed, among which cam 12.1
2 is in contact with the end of the rocker arm 8.8, and the cam 1
3.13 is in contact with the end of the rocker arm 9.9.

したがって、カム軸１０がクランク軸により駆―ガされ
ると、カム１２，１２，１３．１３を介してそれぞれ４
本のロッカアーム８．８，９゜９が独立に躯−力され吸
気弁４，４と排気弁５゜５とを開閉する。Therefore, when the camshaft 10 is driven by the crankshaft, the cams 12, 12, 13.
The rocker arms 8.8, 9.9 are independently pushed to open and close the intake valves 4, 4 and the exhaust valve 5.5.

上述したエンジンでは、カム室１５がシリンダヘッド１
の鋳造時にカバー１８と共に一体に成形されている。こ
れに対し従来のエンジンでは、通電は上記カバー１８が
シリンダヘッドカバーとして別体に製作され、これをボ
ルトによりシリンダヘッド１に固定される＊清となって
いた。そのため、そのボルトスペースによりカム室１５
の内容積がそれだけ狭くならざるを得ないわけてあ名が
、上記エンジンでは上述のよ（５） うにカバー１８がシリンダヘッド１と一体であるため、
それををシリンダヘッド１に固定するためのボルトが不
要となり、そのボルトスペース分をカム室１５の容積と
して広げることができる。In the engine described above, the cam chamber 15 is located in the cylinder head 1.
It is integrally formed with the cover 18 during casting. On the other hand, in conventional engines, electricity is supplied by the cover 18 being manufactured separately as a cylinder head cover and fixed to the cylinder head 1 with bolts. Therefore, due to the bolt space, the cam chamber 15
The reason why the internal volume of the cylinder head 1 has to become so small is that it is nicknamed, but in the above engine, the cover 18 is integrated with the cylinder head 1 as described in (5) above.
A bolt for fixing it to the cylinder head 1 becomes unnecessary, and the volume of the cam chamber 15 can be increased by the bolt space.

したがって、上記頭上カム軸式４バルブエンジンでは、
排気量が小さいものであっても、４バルブをｌ［ｉｌ勧
するための４本のロッカアーム８゜９をロッカアーム軸
８ａ、９ａと共に完全に独立にしてカム室１５内に配置
することができる。Therefore, in the overhead camshaft 4-valve engine,
Even if the displacement is small, the four rocker arms 8.9 for recommending four valves can be arranged completely independently in the cam chamber 15 along with the rocker arm shafts 8a, 9a.

そして、この独立配置に伴う軽量化によりロッカアーム
の’ｔａｔｊｌ性を向上し、すだバルブタイミングの紬
かなズレ調整を可能にしてエンジン性能の向上に寄与さ
せることができる。The weight reduction that accompanies this independent arrangement improves the stability of the rocker arm, making it possible to finely adjust the valve timing and contributing to improved engine performance.

上述したように、本発明は、シリンダヘッドの下面に形
威した燃焼室に２個づづの＠見好と排気弁とをそれぞれ
設け、前記吸気弁と排気弁の８弁軸端を燃焼室上方のカ
ム室に設けたカム軸によりロッカアームを介して駆動す
るようにしたエンジンにおいて、前記ロッカアームの口
（６） ツカアーム軸を８吸排気弁ごとに独立ｆｌｕし、かつ前
記カム室をこのカム室を贋うカバーと共に前記シリンダ
ヘッドと一体に液形したので、カム室のカバーを固定す
るためのボルトのスペースが不要となり、そのため小排
気量のエンジンであ、てもロッカアームをロッカアーム
軸と共に４本独立にしてもカム室に組込みやす（、従来
のように一体にした一つのロッカーアームが二つのバル
ブを掃作しないのでき、エンジン性能の向上に寄与させ
ることができる。As described above, in the present invention, two intake valves and two exhaust valves are provided in the combustion chamber formed on the lower surface of the cylinder head, and the shaft ends of the eight valves of the intake valve and the exhaust valve are placed above the combustion chamber. In an engine that is driven via a rocker arm by a cam shaft provided in a cam chamber, the opening (6) of the rocker arm and the arm shaft are made independent for each of the eight intake and exhaust valves, and the cam chamber is connected to the cam chamber. Since the counterfeit cover is integrated with the cylinder head, there is no need for space for bolts to fix the cam chamber cover, so even with a small displacement engine, the rocker arms can be separated into four independent rocker arms along with the rocker arm shaft. However, it is easy to integrate into the cam chamber (unlike conventional rocker arms, which are integrated into one rocker arm and does not sweep two valves), which contributes to improved engine performance.

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

第１図は本発明による頭上カム軸式４バルブエンジンの
頭部部分における■断面図、第２図は舅１図の■−■矢
視断面図、第３図は舅１図の■−■矢視断面図である。 １・・シリンダヘッド、　　２・・燃焼室、４・・吸気
弁、　　５・・排気弁、 ４ａ、５ａ・・弁軸、 ８．９・畢ロッカアーム− ８ａ、９ａ・・ロッカアーム軸、 （７） １０・・カム軸、　　１２．１３・・カム、１５・・カ
ム室。 代理人　弁理士　小　川　信　− 弁理士　　野　　口　　腎　　照 弁理士　斎　下　和　彦 （８）Fig. 1 is a sectional view of the head portion of the overhead camshaft 4-valve engine according to the present invention, Fig. 2 is a sectional view taken along the arrows - - - of the leg 1, and Fig. 3 is a - - - of the leg 1. It is an arrow sectional view. 1... Cylinder head, 2... Combustion chamber, 4... Intake valve, 5... Exhaust valve, 4a, 5a... Valve shaft, 8.9. Rocker arm - 8a, 9a... Rocker arm shaft, (7) 10...Cam shaft, 12.13...Cam, 15...Cam chamber. Agent: Patent attorney Makoto Ogawa − Patent attorney: Teru Noguchi Patent attorney: Kazuhiko Saishita (8)

Claims (1)

【特許請求の範囲】[Claims] シリンダヘッドの下面に形成した燃焼室に２個づづの吸
気弁とＷ気弁とをそれぞれ設け、前記吸気弁と排気弁の
８弁一端を燃焼室上方のカム室に設けたカム軸により口
・ンカアームを介して躯−力するようにしたエンジンに
おいて、前記ロッカアームのロッカアーム軸を８吸ｔｌ
ＦＫ弁ごとに独立構成し、かつ前記カム室をこのカム室
を覆うカバーと共に前記シリンダヘッドと一体に液形し
たことを特徴とする頭上カム軸式４１イルブエンジン。Two intake valves and two W-air valves are provided in the combustion chamber formed on the lower surface of the cylinder head, and one end of each of the eight intake valves and exhaust valves is connected to a camshaft provided in a cam chamber above the combustion chamber. In an engine that applies power to the body through a rocker arm, the rocker arm shaft of the rocker arm is
An overhead camshaft type 41-lb engine, characterized in that each FK valve is configured independently, and the cam chamber is integrally formed with the cylinder head together with a cover that covers the cam chamber.
JP20447082A 1982-11-24 1982-11-24 Overhead cam shaft type four-valve engine Granted JPS5996405A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20447082A JPS5996405A (en) 1982-11-24 1982-11-24 Overhead cam shaft type four-valve engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20447082A JPS5996405A (en) 1982-11-24 1982-11-24 Overhead cam shaft type four-valve engine

Publications (2)

Publication Number Publication Date
JPS5996405A true JPS5996405A (en) 1984-06-02
JPH0578641B2 JPH0578641B2 (en) 1993-10-29

Family

ID=16491059

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20447082A Granted JPS5996405A (en) 1982-11-24 1982-11-24 Overhead cam shaft type four-valve engine

Country Status (1)

Country Link
JP (1) JPS5996405A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61160507A (en) * 1985-01-08 1986-07-21 Mazda Motor Corp Four valve type engine
JPS63205409A (en) * 1986-11-21 1988-08-24 アー・ファウ・エル　ゲゼルシャフト　フィア　フェアブレヌングスクラフトマシーネン　ウント　メステヒニク　エム・ベー・ハー　プロフェッサー・ドクター・ドクター・ハー・ツェー・ハンス・リスト Internal combustion engine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS504882U (en) * 1973-05-12 1975-01-18
JPS57102506A (en) * 1980-12-18 1982-06-25 Yamaha Motor Co Ltd Engine with four valves and one overhead cam shaft
JPS57115902U (en) * 1981-01-13 1982-07-17

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS504882U (en) * 1973-05-12 1975-01-18
JPS57102506A (en) * 1980-12-18 1982-06-25 Yamaha Motor Co Ltd Engine with four valves and one overhead cam shaft
JPS57115902U (en) * 1981-01-13 1982-07-17

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61160507A (en) * 1985-01-08 1986-07-21 Mazda Motor Corp Four valve type engine
JPS63205409A (en) * 1986-11-21 1988-08-24 アー・ファウ・エル　ゲゼルシャフト　フィア　フェアブレヌングスクラフトマシーネン　ウント　メステヒニク　エム・ベー・ハー　プロフェッサー・ドクター・ドクター・ハー・ツェー・ハンス・リスト Internal combustion engine

Also Published As

Publication number Publication date
JPH0578641B2 (en) 1993-10-29

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