JP2751064B2 - 6-valve 4-cycle engine - Google Patents
6-valve 4-cycle engineInfo
- Publication number
- JP2751064B2 JP2751064B2 JP1032587A JP3258789A JP2751064B2 JP 2751064 B2 JP2751064 B2 JP 2751064B2 JP 1032587 A JP1032587 A JP 1032587A JP 3258789 A JP3258789 A JP 3258789A JP 2751064 B2 JP2751064 B2 JP 2751064B2
- Authority
- JP
- Japan
- Prior art keywords
- intake
- valve
- valves
- cam
- intake valves
- 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 - Lifetime
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Valve-Gear Or Valve Arrangements (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、１つの気筒に対して合計６個の吸・排気弁
を有する６弁式４サイクルエンジンに関するものであ
る。Description: TECHNICAL FIELD The present invention relates to a six-valve four-cycle engine having a total of six intake / exhaust valves for one cylinder.
（発明の背景） ４サイクルエンジンにおいては、吸・排気弁の数を増
やすことにより体積効率の向上を図り、エンジン出力を
増大させることが可能である。従来より１つの気筒に対
して３個の吸気弁と２個の排気弁とを有し、吸気通路の
下流を３つに分岐して各分岐路を各吸気弁に連通させた
ものが公知である。しかしこの場合には、中央の吸気弁
に吸気が集中し易くなり、吸気の各吸気弁への分配が良
好に行われないという不都合が生じる。また中央の吸気
弁に流れる吸気量が多いので、燃焼室内におけるスワー
ル（吸入渦流）が弱くなるという不都合もあった。(Background of the Invention) In a four-stroke engine, it is possible to improve the volumetric efficiency by increasing the number of intake / exhaust valves and increase the engine output. Conventionally, a cylinder having three intake valves and two exhaust valves for one cylinder, branching the downstream of an intake passage into three branches, and connecting each branch passage to each intake valve is known. is there. However, in this case, the intake air tends to concentrate on the central intake valve, and there is a disadvantage that the intake air is not distributed well to each intake valve. In addition, since the amount of intake air flowing through the central intake valve is large, there is a disadvantage that swirl (intake vortex) in the combustion chamber is weakened.
（発明の目的） 本発明はこのような事情に鑑みなされたものであり、
各吸気弁への吸気の分配が良好であり、スワールも強く
なって燃焼が改善され得る６弁式４サイクルエンジンを
提供することを目的とする。(Object of the Invention) The present invention has been made in view of such circumstances,
It is an object of the present invention to provide a six-valve four-cycle engine in which the distribution of intake air to each intake valve is good, the swirl is increased, and combustion can be improved.
（発明の構成） 本発明によればこの目的は、燃焼室の中央付近に点火
栓を有する多弁式４サイクルエンジンにおいて、互いに
隣接する４個の吸気弁と、互いに隣接する２個の排気弁
とを、これらが前記点火栓を囲むようにほぼ等間隔に配
置したことを特徴とする６弁式４サイクルエンジンによ
り達成される。(Constitution of the Invention) According to the present invention, an object of the present invention is to provide a multi-valve four-cycle engine having an ignition plug near the center of a combustion chamber, with four intake valves adjacent to each other and two exhaust valves adjacent to each other. Are arranged at substantially equal intervals so as to surround the spark plug.
（実施例） 第１図は本発明の一実施例である４気筒エンジンのう
ちの２気筒部分の弁配列を示す平面図、第２図はそのエ
ンジンのカムケースを示す平面図、第３図はそのIII−I
II線断面図、第４図は吸気弁の配置を示す第３図におけ
るIV矢視図である。(Embodiment) FIG. 1 is a plan view showing a valve arrangement of a two-cylinder part of a four-cylinder engine according to one embodiment of the present invention, FIG. 2 is a plan view showing a cam case of the engine, and FIG. III-I
FIG. 4 is a cross-sectional view taken along line II, and FIG. 4 is a view taken in the direction of arrow IV in FIG.
第３図において符号10はシリンダヘッド、12はカムケ
ース、14（14a、14b）はカムカバーである。シリンダヘ
ッド10の下にはシリンダボデーがあるが図にはシリンダ
内壁面16のみが示されている。シリンダヘッド10には第
１図に示すように燃焼室18の中央付近にほぼ垂直に臨む
２本の点火栓20が取付けられ、これら点火栓20はカムケ
ース12に設けた点火栓着脱孔22（第２図）から上方へ着
脱可能となっている。なお両点火栓20、20のプラグキャ
ップはこの点火栓着脱孔22を塞ぐキャップと一体化さ
れ、一本のプラグコードに収束されて点火コイル（図示
せず）に接続されている。In FIG. 3, reference numeral 10 denotes a cylinder head, 12 denotes a cam case, and 14 (14a, 14b) denotes a cam cover. Although there is a cylinder body below the cylinder head 10, only the cylinder inner wall surface 16 is shown in the figure. As shown in FIG. 1, two ignition plugs 20 are attached to the cylinder head 10 in the vicinity of the center of the combustion chamber 18 so as to be substantially perpendicular to each other. 2) can be removed upward. The plug caps of the ignition plugs 20 and 20 are integrated with a cap that closes the ignition plug attachment / detachment hole 22, are converged on a single plug cord, and are connected to an ignition coil (not shown).
24（24a〜ｄ）は４本の吸気弁、26（26a〜ｂ）は２本
の排気弁である。これら吸・排気弁24、26は点火栓20を
囲むようにほぼ等間隔に配置されている。なおこの実施
例では内側の２つの吸気弁24b、24cの傘部中央をつなぐ
直線と、外側の２つの吸気弁24a、24dの傘部中央をつな
ぐ直線と、排気弁26a、26bの傘部付近をつなぐ直線と、
両点火栓20、20の着火部をつなぐ直線とは後記カム軸30
に平行となっている。４つの吸気弁24はシリンダ中心に
対して左側に傾き、また両排気弁26は右側に傾いてい
る。内側の吸気弁24b、ｃは外側の吸気弁24a、ｄよりも
小径であり、第３図に示すように、外側の吸気弁24a,d
よりも垂直に近い角度に配設されている。24 (24a-d) is four intake valves, and 26 (26a-b) is two exhaust valves. These intake and exhaust valves 24 and 26 are arranged at substantially equal intervals so as to surround the ignition plug 20. In this embodiment, a straight line connecting the center of the head of the two inner intake valves 24b and 24c, a straight line connecting the center of the head of the two outer intake valves 24a and 24d, and a vicinity of the head of the exhaust valves 26a and 26b. And a straight line connecting
The straight line connecting the ignition parts of the two spark plugs 20 is the camshaft 30 described later.
It is parallel to. The four intake valves 24 are tilted to the left with respect to the cylinder center, and the exhaust valves 26 are tilted to the right. The inner intake valves 24b, c have smaller diameters than the outer intake valves 24a, d, and as shown in FIG. 3, the outer intake valves 24a, d
It is arranged at an angle closer to vertical than it is.
カムケース12と両カムカバー14との間にはカム軸室28
（28a、28b）が形成され、これらカムケース12とカムカ
バー14の合面間にはカム軸30（30a、30b）が配設されて
いる。すなわち、これらの各カム軸30はカムケース12
と、その上面に取付けられた適宜のカムキャップ32（32
a、32b）とに挟持され、これらのカムキャップ32が、カ
ムカバー14で覆われている。A camshaft chamber 28 is provided between the cam case 12 and the two cam covers 14.
(28a, 28b) are formed, and a cam shaft 30 (30a, 30b) is disposed between the mating surfaces of the cam case 12 and the cam cover 14. That is, each of these camshafts 30 is
And an appropriate cam cap 32 (32
a, 32b), and these cam caps 32 are covered with the cam cover 14.
内側の２本の吸気弁24b、24cは第１、４図から明らか
なようにカム軸30aに直交する平面上に位置し、外側の
２本の吸気弁24a、24dはその上部が互いに広がるように
傾いている。第１図でＡ、Ｂは吸気弁24b、24aの弁軸の
中心線を示している。The inner two intake valves 24b and 24c are located on a plane orthogonal to the camshaft 30a, as is clear from FIGS. 1 and 4, and the two outer intake valves 24a and 24d are such that their upper parts are widened to each other. Leaning on. In FIG. 1, A and B indicate the center lines of the valve shafts of the intake valves 24b and 24a.
34（34a〜ｄ）は吸気弁24のリフタ、36（一方のみ図
示）は排気弁26のリフタであり、これらのリフタ34、36
はそれぞれカム軸30a、30bの下方に臨むようにカムケー
ス12に保持されている。なお外側の吸気弁24a、ｄはカ
ム軸30aに直交する平面上にないから、カム軸30aの１気
筒に対する４つのカム38（38a〜ｄ）のうち外側のカム3
8a、ｄのカム面はリフタ34a、ｄの上面に平行に摺接す
るように傾いている（第１、２図参照）。２本の排気弁
26は共にカム軸30bに直交する平面に位置する。なおこ
の実施例においては、それぞれのカム38の間にはカム軸
30aを保持するカムキャップ32aが配設されている。34 (34a to 34d) are lifters of the intake valve 24, and 36 (only one is shown) is a lifter of the exhaust valve 26. These lifters 34, 36
Are held by the cam case 12 so as to face below the cam shafts 30a and 30b, respectively. Since the outer intake valves 24a and 24d are not on a plane orthogonal to the camshaft 30a, the outer cam 3 of the four cams 38 (38a to 38d) for one cylinder of the camshaft 30a is not included.
The cam surfaces 8a and 8d are inclined so as to slide in parallel with the upper surfaces of the lifters 34a and 34d (see FIGS. 1 and 2). Two exhaust valves
26 are both located on a plane orthogonal to the camshaft 30b. In this embodiment, a camshaft is provided between each cam 38.
A cam cap 32a holding 30a is provided.
40は吸気通路であり、シリンダヘッド10の左側面に開
口する横長の吸気口42を持ち、内側の吸気弁24b、ｃ間
に位置する仕切壁44（第１図）で左右に分岐し、各分岐
路46（46a、ｂ、第４図）がそれぞれ吸気弁24a、ｂおよ
び24c、ｄに連通する。また第２図で48はカムチェーン
収容室である。Reference numeral 40 denotes an intake passage, which has a horizontally long intake port 42 opened on the left side surface of the cylinder head 10, and branches right and left by a partition wall 44 (FIG. 1) located between the inner intake valves 24b and 24c. Branch paths 46 (46a, b, FIG. 4) communicate with intake valves 24a, b and 24c, d, respectively. In FIG. 2, reference numeral 48 denotes a cam chain accommodation room.
第５図と第６図は他の実施例の吸・排気弁配列を示す
図である。第５図のものは、４つの吸気弁24（24c〜
ｄ）をほぼ同径にしたものである。ここに内側の吸気弁
24b、ｃの弁径が大きくなるにつれて、両吸気弁24b、ｃ
の傘部周縁が当接するバルブシート（弁座）が接近す
る。そこで第５図に符号50で示すように両吸気弁24b、
ｃのバルブシートを一体化して８字状としたものを用い
てもよい。また第６図のものは点火栓20（20a、20b）を
前記第１図のものと直交する方向に並べたものであり、
他は第１図と同一である。またこの発明は、内側の吸気
弁24b、ｃを外側の吸気弁24a、ｄよりも大径にしてもよ
い。FIG. 5 and FIG. 6 are views showing an intake / exhaust valve arrangement of another embodiment. FIG. 5 shows four intake valves 24 (24c to 24c).
d) is substantially the same diameter. Here the inner intake valve
As the valve diameter of 24b, c increases, both intake valves 24b, c
The valve seat (valve seat) with which the rim of the umbrella abuts approaches. Therefore, as shown by reference numeral 50 in FIG.
An eight-shaped valve seat obtained by integrating the valve seat c may be used. In FIG. 6, the spark plugs 20 (20a, 20b) are arranged in a direction orthogonal to that of FIG.
Others are the same as FIG. In the present invention, the inner intake valves 24b and 24c may have a larger diameter than the outer intake valves 24a and 24d.
（発明の効果） 本発明は以上のように、隣接する４個の吸気弁と隣接
する２個の排気弁とを、燃焼室中央付近の点火栓を囲む
ようにほぼ等間隔に配置したものであるから、吸気は内
側の２つの吸気弁と外側の吸気弁とにほぼ均等に分配さ
れ、全ての吸気弁を有効に使って吸気の流入が行われ
る。また外側の２つの吸気弁から入る吸気は燃焼室内壁
に沿って新気を流入させ、排気弁側の燃焼室内壁に当っ
て点火栓に向うほぼ左右対称なスワールを作る。この点
火栓に向う新気は内側の吸気弁から入る新気に当りこれ
を燃焼室下方へ導き、既燃ガスと新規との交換を促進す
る。このように新気のスワールが強化され、さらに点火
栓は燃焼室中央付近に位置するから、燃焼が改善されエ
ンジン性能が向上する。(Effects of the Invention) As described above, the present invention arranges four adjacent intake valves and two adjacent exhaust valves at substantially equal intervals so as to surround an ignition plug near the center of the combustion chamber. Therefore, the intake air is substantially equally distributed to the two inner intake valves and the outer intake valve, and the intake of the intake air is performed by effectively using all the intake valves. Also, the intake air entering from the two outer intake valves causes fresh air to flow in along the combustion chamber wall, and hits the combustion chamber wall on the exhaust valve side to form a substantially symmetrical swirl toward the spark plug. The fresh air directed to the spark plug hits the fresh air coming from the inner intake valve and guides it to the lower part of the combustion chamber, thereby promoting the exchange of burned gas with fresh. Thus, the swirl of fresh air is strengthened, and the ignition plug is located near the center of the combustion chamber, so that combustion is improved and engine performance is improved.
第１図は本発明の一実施例の弁配列を示す平面図、第２
図はそのエンジンのカムケースを示す平面図、第３図は
そのIII−III線断面図、第４図は吸気弁の配置を示す第
３図におけるIV矢視図である。また第５、６図は他の実
施例の吸・排気弁配置を示す図である。 10……シリンダヘッド、 12……カムケース、 18……燃焼室、 20……点火栓、 24……吸気弁、 26……排気弁、 30……カム軸。FIG. 1 is a plan view showing a valve arrangement according to an embodiment of the present invention, and FIG.
FIG. 3 is a plan view showing a cam case of the engine, FIG. 3 is a sectional view taken along the line III-III of FIG. 3, and FIG. 4 is a view taken along the arrow IV in FIG. FIGS. 5 and 6 show the arrangement of intake and exhaust valves of another embodiment. 10 ... cylinder head, 12 ... cam case, 18 ... combustion chamber, 20 ... spark plug, 24 ... intake valve, 26 ... exhaust valve, 30 ... camshaft.
Claims (1)
４サイクルエンジンにおいて、 互いに隣接する４個の吸気弁と、互いに隣接する２個の
排気弁とを、これらが前記点火栓を囲むようにほぼ等間
隔に配置したことを特徴とする６弁式４サイクルエンジ
ン。1. A six-valve four-stroke engine having an ignition plug near the center of a combustion chamber, comprising: four intake valves adjacent to each other and two exhaust valves adjacent to each other; A six-valve, four-cycle engine characterized by being arranged at substantially equal intervals to surround it.
Priority Applications (9)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1032587A JP2751064B2 (en) | 1989-02-14 | 1989-02-14 | 6-valve 4-cycle engine |
| US07/483,404 US5016592A (en) | 1989-02-14 | 1990-02-13 | Cylinder head and valve train arrangement for multiple valve engine |
| EP92100755A EP0483109B1 (en) | 1989-02-14 | 1990-02-14 | Camshaft arrangement for multiple valve engine |
| DE69027032T DE69027032T2 (en) | 1989-02-14 | 1990-02-14 | Camshaft arrangement for a multi-valve internal combustion engine |
| DE69023238T DE69023238T2 (en) | 1989-02-14 | 1990-02-14 | Valve drive arrangement for multi-valve internal combustion engine. |
| EP90102890A EP0383297B1 (en) | 1989-02-14 | 1990-02-14 | Cylinder head and valve train arrangement for multiple valve engine |
| DE69027871T DE69027871T2 (en) | 1989-02-14 | 1990-02-14 | Cylinder head and valve train arrangement for multi-valve internal combustion engine |
| EP92100683A EP0479773B1 (en) | 1989-02-14 | 1990-02-14 | Valve train arrangement for multiple valve engine |
| US07/623,698 US5111791A (en) | 1989-02-14 | 1990-12-07 | Cylinder head and valve train arrangement for multiple valve engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1032587A JP2751064B2 (en) | 1989-02-14 | 1989-02-14 | 6-valve 4-cycle engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02215906A JPH02215906A (en) | 1990-08-28 |
| JP2751064B2 true JP2751064B2 (en) | 1998-05-18 |
Family
ID=12362998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1032587A Expired - Lifetime JP2751064B2 (en) | 1989-02-14 | 1989-02-14 | 6-valve 4-cycle engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2751064B2 (en) |
-
1989
- 1989-02-14 JP JP1032587A patent/JP2751064B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02215906A (en) | 1990-08-28 |
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