JPH0321723B2 - - Google Patents
Info
- Publication number
- JPH0321723B2 JPH0321723B2 JP16884788A JP16884788A JPH0321723B2 JP H0321723 B2 JPH0321723 B2 JP H0321723B2 JP 16884788 A JP16884788 A JP 16884788A JP 16884788 A JP16884788 A JP 16884788A JP H0321723 B2 JPH0321723 B2 JP H0321723B2
- Authority
- JP
- Japan
- Prior art keywords
- camshaft
- intake
- attachment
- exhaust
- engine
- 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.)
- Expired
Links
- 238000002485 combustion reaction Methods 0.000 claims description 12
- 238000001816 cooling Methods 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000006200 vaporizer Substances 0.000 description 1
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
- 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
- Valve-Gear Or Valve Arrangements (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
Description
【発明の詳細な説明】
(産業上の利用分野)
この発明は、1気筒に対してそれぞれ複数の吸
気弁と排気弁とを有する場合に、これら吸・排気
弁を1本のカム軸によつて開閉駆動するようにし
た1頭上カム軸型エンジンに関するものである。Detailed Description of the Invention (Industrial Application Field) This invention provides a method for connecting the intake and exhaust valves using a single camshaft when each cylinder has a plurality of intake valves and a plurality of exhaust valves. This invention relates to a single overhead camshaft type engine that is driven to open and close.
(発明の背景)
従来よりカム軸をエンジン頭部に配設し高速回
転に適合させたいわゆるオーバヘツドカムシヤフ
ト(以下OHCという)エンジンがある。また1
個の燃焼室につき吸気弁および排気弁をそれぞれ
複数個づつ設け、吸・排気効率を高めることによ
り高出力を追及したエンジンもすでに知られてい
る。(Background of the Invention) Conventionally, there has been a so-called overhead camshaft (hereinafter referred to as OHC) engine in which a camshaft is disposed in the engine head and adapted to high-speed rotation. Also 1
Engines that pursue high output by providing a plurality of intake valves and a plurality of exhaust valves for each combustion chamber to increase intake and exhaust efficiency are already known.
このように吸・排気弁をそれぞれ複数個有する
ものでOHCエンジンに構成する場合は、従来は
吸・排気弁用にそれぞれ別々のカム軸を設け、ダ
ブルオーバーヘツドカム(DOHC)構成とし、
両カム軸間に点火栓を配設していた。しかしこの
DOHC構成のものは部品点数が増えエンジンが
大型化するという問題があつた。そこで1本のカ
ム軸によつて全ての吸・排気弁を開閉する構成が
考えられるが、この場合には特にシリンダヘツド
周辺のレイアウトが問題になる。すなわち、点火
栓はその着火部である電極が燃焼室の略中央に臨
むように配置するのが望ましいが、カム軸が燃焼
室中央付近と上方に位置したのではカム軸などの
動弁機構と点火栓が接近し、特に点火栓着脱のた
めの空間(着脱孔)を確保することが困難になる
からである。このためシリンダヘツドが大型化す
るという問題があつた。 When constructing an OHC engine with multiple intake and exhaust valves, conventionally, separate camshafts were provided for each intake and exhaust valve, resulting in a double overhead cam (DOHC) configuration.
A spark plug was placed between both camshafts. But this
DOHC configurations had the problem of increasing the number of parts and making the engine larger. Therefore, a configuration in which all the intake and exhaust valves are opened and closed by a single camshaft has been considered, but in this case, the layout especially around the cylinder head becomes a problem. In other words, it is desirable to arrange the spark plug so that the electrode, which is the ignition part, faces approximately the center of the combustion chamber, but if the camshaft is located near the center and above the combustion chamber, the valve mechanism such as the camshaft may This is because the ignition plugs are close together, making it particularly difficult to secure a space (attachment/detachment hole) for attaching and detaching the ignition plug. As a result, there was a problem in that the cylinder head became larger.
また各吸・排気弁をロツカアームで開閉する場
合はこれらロツカアームとの関係にも配慮して小
型化に適し加工性が優れた合理的配置を可能にす
ることが望ましい。 Further, when each intake/exhaust valve is opened and closed by a rocker arm, it is desirable to consider the relationship with the rocker arm and to enable a rational arrangement that is suitable for downsizing and has excellent workability.
(発明の目的)
この発明はこのような事情に鑑みなされたもの
であり、それぞれ複数の吸気弁と排気弁を1本の
カム軸でロツカアームを介して開閉駆動する場合
に、点火栓を燃焼室中央付近に臨ませつつその着
脱孔を無理なく確保でき、またエンジンの小型化
に適した合理的配置が可能になる1頭上カム軸型
エンジンを提供することを目的とする。(Object of the Invention) This invention was made in view of the above circumstances, and when a plurality of intake valves and exhaust valves are driven to open and close by a single camshaft via a rocker arm, the ignition plug is connected to the combustion chamber. To provide a single overhead camshaft type engine which can easily secure an attachment/detachment hole while facing near the center, and can be rationally arranged suitable for miniaturization of the engine.
(発明の構成)
この発明によればこの目的は、1つの気筒に対
して、1本のカム軸と、このカム軸に直交する平
面上にあつて前記カム軸方向に並設されたそれぞ
れ複数個の吸気弁および排気弁と、これら吸・排
気弁をカム軸により開閉する複数のロツカアーム
と、前記カム軸に垂直な平面上に位置しその着火
部が燃焼室の中央付近に臨む1個の点火栓とを備
える1頭上カム軸型エンジンにおいて、前記点火
栓の着脱孔を、カム軸に対し一側に位置する2つ
のロツカアームの間に位置させると共に、着脱孔
を挟む2つのロツカアームを着脱孔に沿つて湾曲
させたことを特徴とする1頭上カム軸型エンジン
により達成される。(Structure of the Invention) According to the present invention, the object is to provide one camshaft for one cylinder, and a plurality of camshafts arranged in parallel in the camshaft direction on a plane perpendicular to the camshaft. intake valves and exhaust valves, a plurality of rocker arms that open and close these intake and exhaust valves using camshafts, and one rocker arm that is located on a plane perpendicular to the camshaft and whose ignition part faces near the center of the combustion chamber. In a single overhead camshaft engine equipped with an ignition plug, the attachment/detachment hole of the ignition plug is located between two rocker arms located on one side with respect to the camshaft, and the two rocker arms sandwiching the attachment/detachment hole are connected to the attachment/detachment hole. This is achieved by a single overhead camshaft engine characterized by a curved line along the .
ここにカム軸をシリンダ中心線に対し一方へ偏
位させ、点火栓を他方へ傾斜させれば、点火栓の
着脱孔は一層無理なく大きく確保することが可能
になる。 If the camshaft is deviated to one side with respect to the cylinder centerline and the ignition plug is tilted to the other side, the ignition plug attachment/detachment hole can be more easily secured to a larger size.
(実施例) 以下図面に基いてこの発明を詳細に説明する。(Example) The present invention will be explained in detail below based on the drawings.
第1図はこの発明の一実施例であるエンジンを
搭載した自動二輪車を一部断面して示す側面図、
第2図はその要部縦断面図、第3図と第4図は第
2図における−線および−線断面図であ
る。 FIG. 1 is a partially sectional side view of a motorcycle equipped with an engine that is an embodiment of the present invention;
FIG. 2 is a longitudinal sectional view of the main part thereof, and FIGS. 3 and 4 are sectional views taken along the - line and - line in FIG. 2.
第1図において符号1はクレードル型メインフ
レーム、2は前輪フオーク、3は前輪、4は後輪
である。5はメインフレーム1を構成するステア
リングヘツドパイプ、6は同じくメインパイプで
あり前端がこのヘツドパイプ5に溶着され略々水
平に後方へ延在する。7は同じくメインフレーム
1を構成するダウンチユーブであり、側面略逆台
形に折曲され前端がヘツドパイプ5にまた後端が
メインパイプ6にそれぞれ溶着されている。また
8はタンクレール、9は補強用ステーである。前
記前輪フオーク2はメインフレーム1のヘツドパ
イプ5に回動自在に軸支されている。10は後輪
4を軸支するリヤアームであり、その前端はメイ
ンフレーム1に上下揺動可能に軸着されると共
に、その後端とメインパイプ6との間には減衰器
付きのばね11が装着されている。 In FIG. 1, numeral 1 is a cradle type main frame, 2 is a front wheel fork, 3 is a front wheel, and 4 is a rear wheel. Numeral 5 is a steering head pipe constituting the main frame 1, and 6 is a main pipe whose front end is welded to the head pipe 5 and extends rearward approximately horizontally. Reference numeral 7 designates a down tube which also constitutes the main frame 1, and whose side surfaces are bent into a substantially inverted trapezoid shape and whose front end is welded to the head pipe 5 and its rear end to the main pipe 6, respectively. Further, 8 is a tank rail, and 9 is a reinforcing stay. The front wheel fork 2 is rotatably supported by a head pipe 5 of the main frame 1. Reference numeral 10 denotes a rear arm that pivotally supports the rear wheel 4. Its front end is pivotally attached to the main frame 1 so as to be able to swing vertically, and a spring 11 with a damper is installed between the rear end and the main pipe 6. has been done.
12は1本のカム軸13を持つ1頭上カム軸型
単気筒エンジンであり、前記ヘツドパイプ5の下
後方に位置する。このエンジン12の上部と下部
はそれぞれ前記メインパイプ6とダウンチユーブ
7に保持されている。14は排気弁であり、燃焼
室15の前方寄りに2個設けられている。排気通
路16はエンジン12の車輛進行方向に開口し、
この排気通路16から出る排気は排気管17によ
つて車輛後方へ導かれる。18は吸気弁であり、
燃焼室15の後方寄りに2個設けられている。吸
気通路19はエンジン12の後方向きに開口し、
ここには気化器20が接続されている。排気弁1
4と吸気弁18はシリンダブロツク21の上方に
接合されたシリンダヘツド22に設けられ、この
シリンダヘツド22の上方にはシリンダヘツドカ
バー23が装着されている。これらシリンダヘツ
ド22とシリンダヘツドカバー23により動弁室
が形成され、この動弁室にはロツカアーム32,
33,36、ロツカアーム軸34,35,37、
弁ばね27,28等の動弁機能が収容される。な
お、図中24は前記カム軸13に一体的に設けら
れたスプロケツトであり、このスプロケツト24
と、クランク軸に設けられたスプロケツト25と
の間にはタイミングチエーン26が掛け渡され、
クランク軸が2回転した時にカム軸13が1回転
する。 Reference numeral 12 designates a single overhead camshaft type single cylinder engine having one camshaft 13, which is located below and rearward of the head pipe 5. The upper and lower parts of this engine 12 are held by the main pipe 6 and down tube 7, respectively. Reference numeral 14 designates exhaust valves, two of which are provided near the front of the combustion chamber 15. The exhaust passage 16 opens in the vehicle traveling direction of the engine 12,
Exhaust gas exiting from this exhaust passage 16 is guided to the rear of the vehicle by an exhaust pipe 17. 18 is an intake valve;
Two of them are provided near the rear of the combustion chamber 15. The intake passage 19 opens toward the rear of the engine 12,
A vaporizer 20 is connected here. Exhaust valve 1
4 and the intake valve 18 are provided in a cylinder head 22 joined above the cylinder block 21, and a cylinder head cover 23 is mounted above the cylinder head 22. A valve train chamber is formed by these cylinder head 22 and cylinder head cover 23, and the rocker arm 32,
33, 36, rocker arm shaft 34, 35, 37,
Valve operating functions such as valve springs 27 and 28 are accommodated. In addition, 24 in the figure is a sprocket provided integrally with the camshaft 13, and this sprocket 24
A timing chain 26 is spanned between and a sprocket 25 provided on the crankshaft.
The camshaft 13 rotates once when the crankshaft rotates twice.
次に第2〜4図に基づいてシリンダヘツド22
付近を説明する。前記2個の排気弁14は前傾す
るようにシリンダヘツド22に並設され、その軸
部14aの上部突出部には弁ばね27が装着さ
れ、この弁ばね27は排気弁14を閉じる方向へ
付勢している。吸気弁18は燃焼室15の後方寄
りに2個並設されている。この吸気弁18は後方
へ傾くように設けられ、その軸部18aの上部突
出部には弁ばね28が装着され、吸気弁18を閉
じる方向へ付勢している。なお排気弁14と吸気
弁18の弁軸は、カム軸13に直交する平面上に
あつて前記カム軸方向に並設されている。排気弁
14と吸気弁18とで形成される側面視路V形の
挟角内の空間には、横向きに1本のカム軸13が
シリンダヘツド22とヘツドカバー23との合わ
せ面間に軸支されている。このカム軸13は第
2,3図から明らかなようにシリンダ中心に対し
て吸気弁18側に偏位している。このカム軸13
の略中央には吸気弁18を開閉駆動する吸気用の
カム29が1個形成され、このカム29を挟んで
2個の排気用カム30,31が形成されている。
カム軸13の一端には前記スプロケツト24が固
定されている。 Next, the cylinder head 22 is
Describe the area. The two exhaust valves 14 are arranged side by side on the cylinder head 22 so as to be tilted forward, and a valve spring 27 is attached to the upper protrusion of the shaft portion 14a, and this valve spring 27 moves in the direction of closing the exhaust valve 14. It is energizing. Two intake valves 18 are arranged in parallel near the rear of the combustion chamber 15. The intake valve 18 is provided so as to be inclined rearward, and a valve spring 28 is attached to the upper protrusion of the shaft portion 18a, urging the intake valve 18 in the closing direction. The valve shafts of the exhaust valve 14 and the intake valve 18 are arranged on a plane perpendicular to the camshaft 13 and parallel to each other in the camshaft direction. In the space within the included angle of the V-shaped path in side view formed by the exhaust valve 14 and the intake valve 18, one camshaft 13 is supported horizontally between the mating surfaces of the cylinder head 22 and the head cover 23. ing. As is clear from FIGS. 2 and 3, the camshaft 13 is offset toward the intake valve 18 with respect to the center of the cylinder. This camshaft 13
One intake cam 29 for driving the intake valve 18 to open and close is formed approximately in the center thereof, and two exhaust cams 30 and 31 are formed with this cam 29 in between.
The sprocket 24 is fixed to one end of the camshaft 13.
32,33は別体に作られた左右一対の排気用
ロツカアームであり、これらはカム軸13より上
方に位置する左右一対のロツカアーム軸34,3
5にそれぞれ独立に揺動自在に軸支され、その一
端はそれぞれ前記カム30,31に摺接し他端は
前記各排気弁14の軸端部に対向している。なお
ロツカアーム軸34,35は同軸上に配設されて
いるが、両軸間には後記する点火栓38の着脱孔
40が通る間隙が形成されている。これら排気側
のロツカアーム32,33は第3図に明らかなよ
うに、着脱孔40にそつて湾曲し、それらの先端
すなわち排気弁14,14の軸端側の先端が互い
に接近している。このため小排気量のエンジンで
両排気弁の間隔が小さくなつた場合においても、
十分な着脱孔40の空間を確保することが可能に
なる。 Reference numerals 32 and 33 denote a pair of left and right exhaust rocker arms that are made separately, and these are connected to a pair of left and right rocker arm shafts 34 and 3 located above the camshaft 13.
5 so as to be able to swing independently, one end of which is in sliding contact with the cams 30 and 31, and the other end of which is opposed to the shaft end of each of the exhaust valves 14. Although the rocker arm shafts 34 and 35 are arranged coaxially, a gap is formed between the two shafts through which an attachment/detachment hole 40 for a spark plug 38 (to be described later) passes. As is clear from FIG. 3, these rocker arms 32 and 33 on the exhaust side are curved along the attachment/detachment hole 40, and their tips, that is, the tips on the shaft end sides of the exhaust valves 14 and 14 are close to each other. For this reason, even when the distance between both exhaust valves is small in a small displacement engine,
It becomes possible to secure a sufficient space for the attachment/detachment hole 40.
36は吸気用ロツカアームであり、カム軸13
より上方に位置する1本のロツカアーム軸37に
より揺動自在に軸支されている。ロツカアーム軸
37は、排気側のロツカアーム軸34,35とカ
ム軸13と共に側面視略逆三角形を形成するよう
に位置する。このロツカアーム36は一端が前記
カム29に摺接すると共に他端は二股状に分岐し
それぞれ前記した2個の吸気弁18の軸端部に対
向している。 36 is an intake rocker arm, which is connected to the camshaft 13.
It is pivotally supported by one rocker arm shaft 37 located higher up. The rocker arm shaft 37 is positioned so as to form a substantially inverted triangle in side view together with the rocker arm shafts 34 and 35 on the exhaust side and the camshaft 13. One end of the rocker arm 36 is in sliding contact with the cam 29, and the other end is bifurcated and faces the shaft ends of the two intake valves 18, respectively.
38は点火栓であり、その先端の着火部である
電極39は各排気弁14および吸気弁18で囲ま
れる位置から燃焼室15の略中央に臨み、2個の
排気弁14の間にあつてこの排気弁14と略平行
となるように取付けられている。すなわちこの点
火栓38はカム軸13に直交する平面上にあつ
て、2個の排気側のロツカアーム軸34,35の
間から着脱できるようになつている。シリンダヘ
ツド22とヘツドカバー23には、この点火栓3
8の着脱を行なうための着脱孔40が形成されて
いる。すなわちカム軸13の軸受を上方から保持
するキヤツプ部材はヘツドカバー23で兼用さ
れ、このヘツドカバー23にはシリンダヘツド2
2側に密着してシリンダヘツド22に連通する着
脱孔40が一体形成されている。 Reference numeral 38 denotes an ignition plug, and an electrode 39 which is the ignition part at the tip faces approximately the center of the combustion chamber 15 from a position surrounded by each exhaust valve 14 and intake valve 18, and is located between the two exhaust valves 14. It is attached so as to be substantially parallel to this exhaust valve 14. That is, the ignition plug 38 is located on a plane perpendicular to the camshaft 13 and can be attached and detached from between the two rocker arm shafts 34 and 35 on the exhaust side. This spark plug 3 is attached to the cylinder head 22 and head cover 23.
An attachment/detachment hole 40 is formed for attaching and detaching the device 8. That is, the cap member that holds the bearing of the camshaft 13 from above is also used as the head cover 23, and the cylinder head 2 is attached to the head cover 23.
An attachment/detachment hole 40 is integrally formed on the second side and communicates with the cylinder head 22.
この着脱孔40はエンジン12の斜め前上方を
指向して開口している。このため点火栓38はエ
ンジン12の斜め前上方から、すなわちヘツドパ
イプ5の後下方から着脱可能となる。 This attachment/detachment hole 40 opens obliquely toward the front and upper side of the engine 12. Therefore, the ignition plug 38 can be attached and removed from the upper front of the engine 12, that is, from the lower rear of the head pipe 5.
41はシリンダヘツド22に形成された冷却風
通路であり、その前部開口42は2個の排気弁1
4,14の間を通りエンジン12の前方を指向
し、その後部開口43は2個の吸気弁18,18
の間を通りエンジン12の後方を指向している。
この冷却風通路41は点火栓38付近において前
記着脱孔40と合流すると共に、前記カム軸13
の下方を通るように形成されている。なおこの実
施例では第3,4図に明らかなように、カム軸1
3の下方を通り点火栓38付近において前記冷却
風通路41に合流する横方向の冷却風通路44が
シリンダヘツド23に形成されている。この冷却
風通路放熱路44は前記スプロケツト24と反対
の側面が横方向に開口している。 41 is a cooling air passage formed in the cylinder head 22, and its front opening 42 is connected to two exhaust valves 1.
The rear opening 43 passes between the two intake valves 18 and 14 and is oriented toward the front of the engine 12.
It passes through the gap and points toward the rear of the engine 12.
This cooling air passage 41 merges with the attachment/detachment hole 40 near the spark plug 38, and also joins the camshaft 13.
It is formed to pass under the In this embodiment, as is clear from FIGS. 3 and 4, the camshaft 1
A horizontal cooling air passage 44 is formed in the cylinder head 23, passing below the cylinder head 3 and merging with the cooling air passage 41 near the spark plug 38. The cooling air passage heat radiation passage 44 has a side surface opposite to the sprocket 24 that opens laterally.
以上の実施例では点火栓38の着脱孔40を排
気弁14側に傾斜させかつカム軸13を吸気弁1
8側に偏位させたが、点火栓38を吸気弁18側
へ傾斜させカム軸13をその反対側へ偏位させる
ことも可能である。この場合には吸気用ロツカア
ーム36を2個としてその間に点火栓38を配置
すればよい。 In the above embodiment, the attachment/detachment hole 40 of the spark plug 38 is inclined toward the exhaust valve 14 side, and the camshaft 13 is connected to the intake valve 14 side.
Although the spark plug 38 is tilted toward the intake valve 18 side, it is also possible to tilt the camshaft 13 toward the opposite side. In this case, two intake rocker arms 36 may be provided and the spark plug 38 may be placed between them.
(発明の効果)
本発明は以上のように、それぞれ複数個の吸・
排気弁と、複数のロツカアームと、燃焼室中央付
近に着火部が臨む1個の点火栓とを各気筒に対し
て有する場合に、点火栓を2つの吸気側または排
気側のロツカアーム間に配置し、これらのロツカ
アームを点火栓着脱孔に沿つて湾曲させたもので
あるから、点火栓着脱孔を大きく確保しつつエン
ジンの小型化が図れる。また、これらのロツカア
ームにより開閉される弁間隔を狭めることができ
るので、特に小排気量のエンジンに適用すれば、
弁間隔を広げることなく無理なく点火栓をロツカ
アーム間に配置できる。(Effect of the invention) As described above, the present invention has a plurality of suction and
When each cylinder has an exhaust valve, a plurality of rocker arms, and one spark plug whose ignition part faces near the center of the combustion chamber, the spark plug is arranged between two rocker arms on the intake side or the exhaust side. Since these rocker arms are curved along the spark plug attachment/removal hole, the engine can be made smaller while ensuring a large spark plug attachment/removal hole. In addition, since the spacing between valves opened and closed by these locking arms can be narrowed, especially when applied to small displacement engines,
The ignition plug can be easily placed between the rocker arms without increasing the valve interval.
第1図はこの発明の一実施例であるエンジンを
搭載した自動二輪車を一部断面して示す断面図、
第2図はその要部縦断面図、第3図と第4図は第
2図における−線および−線断面図であ
る。
12……頭上カム軸型エンジン、13……カム
軸、14……排気弁、15……燃焼室、18……
吸気弁、32,33,36……ロツカアーム、3
4,35……ロツカアーム軸、38……点火栓、
39……着火部としての電極、40……着脱孔。
FIG. 1 is a partially cross-sectional view of a motorcycle equipped with an engine according to an embodiment of the present invention;
FIG. 2 is a longitudinal sectional view of the main part thereof, and FIGS. 3 and 4 are sectional views taken along the - line and - line in FIG. 2. 12...Overhead camshaft engine, 13...Camshaft, 14...Exhaust valve, 15...Combustion chamber, 18...
Intake valve, 32, 33, 36...Rotsuka arm, 3
4, 35...Rotsuka arm shaft, 38...Ignition plug,
39... Electrode as an ignition part, 40... Attachment/removal hole.
Claims (1)
カム軸に直交する平面上にあつて前記カム軸方向
に並設されたそれぞれ複数個の吸気弁および排気
弁と、これら吸・排気弁をカム軸により開閉する
複数のロツカアームと、前記カム軸に垂直な平面
上に位置しその着火部が燃焼室の中央付近に臨む
1個の点火栓とを備える1頭上カム軸型エンジン
において、 前記点火栓の着脱孔を、カム軸に対し一側に位
置する2つのロツカアームの間に位置させると共
に、着脱孔を挟む2つのロツカアームを着脱孔に
沿つて湾曲させたことを特徴とする1頭上カム軸
型エンジン。[Claims] 1. For one cylinder, one camshaft, and a plurality of intake valves and exhaust valves arranged in parallel in the camshaft direction on a plane perpendicular to the camshaft. , a plurality of rocker arms that open and close these intake and exhaust valves using camshafts, and one spark plug that is located on a plane perpendicular to the camshaft and whose ignition part faces near the center of the combustion chamber. In the camshaft type engine, the attachment/detachment hole of the ignition plug is located between two rocker arms located on one side of the camshaft, and the two rocker arms sandwiching the attachment/detachment hole are curved along the attachment/detachment hole. A single overhead camshaft engine featuring:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16884788A JPH01104904A (en) | 1988-07-08 | 1988-07-08 | Single overhead camshaft engine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP16884788A JPH01104904A (en) | 1988-07-08 | 1988-07-08 | Single overhead camshaft engine |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11512878A Division JPS5543228A (en) | 1978-09-21 | 1978-09-21 | Overhead cam-shaft engine |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH01104904A JPH01104904A (en) | 1989-04-21 |
JPH0321723B2 true JPH0321723B2 (en) | 1991-03-25 |
Family
ID=15875642
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP16884788A Granted JPH01104904A (en) | 1988-07-08 | 1988-07-08 | Single overhead camshaft engine |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH01104904A (en) |
-
1988
- 1988-07-08 JP JP16884788A patent/JPH01104904A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPH01104904A (en) | 1989-04-21 |
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