JPS5993921A - 3-valve type internal-combustion engine - Google Patents
3-valve type internal-combustion engineInfo
- Publication number
- JPS5993921A JPS5993921A JP57203289A JP20328982A JPS5993921A JP S5993921 A JPS5993921 A JP S5993921A JP 57203289 A JP57203289 A JP 57203289A JP 20328982 A JP20328982 A JP 20328982A JP S5993921 A JPS5993921 A JP S5993921A
- Authority
- JP
- Japan
- Prior art keywords
- valve port
- intake valve
- exhaust
- combustion chamber
- port
- 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
Links
Classifications
-
- 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
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/08—Other engines characterised by special shape or construction of combustion chambers to improve operation with positive ignition
-
- 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
- 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)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、２個の吸気弁口と１個の排気弁口を燃焼室に
開口した３弁式内燃機関に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a three-valve internal combustion engine having two intake valve ports and one exhaust valve port opening into a combustion chamber.
この種内燃機関は、一般に、狭い燃焼室の天井面におい
て吸気弁口の総合有効面積を排気弁口の有効面積より充
分に大きく得ることができるので、充填効率を高めるこ
とができ、しかも１個の吸気弁口の有効面積は比較的小
さいので、これを開閉する吸気弁の小型化を図ってその
慣性重量を軽減し、機関の高速運転時における動弁機構
に対する各吸気弁の追従性を良好にすることができ、よ
って優れた高速出力性能を発揮し得る利点がある。In this type of internal combustion engine, it is generally possible to obtain a comprehensive effective area of the intake valve port that is sufficiently larger than the effective area of the exhaust valve port on the ceiling surface of the narrow combustion chamber. The effective area of the intake valve opening is relatively small, so the intake valve that opens and closes it is made smaller to reduce its inertial weight, and the ability of each intake valve to follow the valve mechanism when the engine is running at high speeds is improved. Therefore, it has the advantage of exhibiting excellent high-speed output performance.
本発明は、このような利点を助長させ、その上、燃焼室
における火焔の伝播距離を短縮できてアンチノンキング
性をも向上させ得る前記内燃機関を得ることを目的とす
るものである。It is an object of the present invention to provide an internal combustion engine that can enhance these advantages, shorten the flame propagation distance in the combustion chamber, and improve anti-nonking properties.
以下、図面により本発明の実施例について説明するＯ
先ず、第１〜３図を参照して本発明の第１実施例につい
て説明すると、図示の内燃機関はクロスフロー型４サイ
クルガソリン機関であって、その機関本体Ｅは、シリン
ダブロック１と、それの上面にガスケット３を介して重
合結着されるシリンダヘンド２とを備え、シリンダブロ
ック１に形成されたシリンダ４内にはピストン５が摺合
される。Embodiments of the present invention will be described below with reference to the drawings. First, a first embodiment of the present invention will be described with reference to FIGS. , the engine body E includes a cylinder block 1 and a cylinder hend 2 which is superimposed and bonded to the upper surface of the cylinder block 1 via a gasket 3, and a piston 5 is slidably fitted into a cylinder 4 formed in the cylinder block 1. .
シリンダヘンド２の底面には、ピストン５上面に対面す
る部分に燃焼室６が凹設され、この燃焼室６の天井面７
は、略中央部の稜線８から両側に向って下る二つの天井
斜面７１ ．７２ よりなっている。A combustion chamber 6 is recessed in the bottom surface of the cylinder hend 2 at a portion facing the top surface of the piston 5, and a ceiling surface 7 of the combustion chamber 6 is recessed.
are two ceiling slopes 71. which descend from the ridgeline 8 in the approximate center toward both sides. It consists of 72.
一方の天井斜面７１には対をなす第１．第２吸気弁口９
１，９□が稜線８に沿って並列して開口され、他方の天
井面７２には、１個の排気弁口１０が第１吸気弁口９１
との対面側に偏位して開口され、またシリンダヘンド２
に螺着された点火栓１１” の電極が第２吸気弁口９□
０対面側で燃焼室６の中心部に可及的に近接して配設さ
れる。このようにすると、３個の弁口９□ 、９２−１
０に殆ど邪魔されることなく点火栓１１の電極、即ち点
火源を燃焼室６の中心部に容易に近付けることができ、
したがって点火源から燃焼室６０周縁までの距離な略等
しくづ−ることかできるから、点火源によって混合気が
点火されたときの火焔の伝播距離が短くなり、燃焼時間
が短縮してアンチノンキング性が向上する。On one ceiling slope 71, a pair of first. Second intake valve port 9
1 and 9□ are opened in parallel along the ridge line 8, and one exhaust valve port 10 is opened in parallel with the first intake valve port 91 on the other ceiling surface 72.
The opening is deviated to the side facing the cylinder hand 2.
The electrode of the spark plug 11” screwed onto the second intake valve port 9□
It is arranged as close as possible to the center of the combustion chamber 6 on the zero facing side. In this way, three valve ports 9□, 92-1
The electrode of the spark plug 11, that is, the ignition source, can be easily brought close to the center of the combustion chamber 6 without being hindered by the combustion chamber 6.
Therefore, since the distance from the ignition source to the periphery of the combustion chamber 60 can be set approximately equal, the propagation distance of the flame when the air-fuel mixture is ignited by the ignition source is shortened, and the combustion time is shortened to prevent non-king. Improves sex.
ここで、第１．第２吸気弁口９１ ．９２の各有効面積
なＡｉ、、Ａｉ２、排気弁口１０の有効面積なＡ ｅ
、シリンダ４の断面積を、４ｃとすると、次式（１）、
（２）が成立するように第１．第２吸気弁口９．。Here, the first. Second intake valve port 91. 92 effective area Ai, , Ai2, effective area A e of the exhaust valve port 10
, if the cross-sectional area of cylinder 4 is 4c, then the following equation (1),
First, so that (2) holds true. Second intake valve port9. .
９□並びに排気弁口１０は形成される。9□ and the exhaust valve port 10 are formed.
尚、図示例ではＡ１１＝Ａｉ、となっている。In the illustrated example, A11=Ai.
一般に内燃機関においては、吸気速度係数と排気速度係
数との比γを０．５〜１．８の範囲に設定すると吸気流
量と排気流量の適正なマツチングが得られ、良好な出力
特性を発揮することができるが、前記（１］ 、 （２
）式を成立させると、この３弁式内燃機関のγを上記値
の範囲に収められることが実験により確認された。In general, in internal combustion engines, if the ratio γ between the intake speed coefficient and the exhaust speed coefficient is set in the range of 0.5 to 1.8, proper matching of the intake flow rate and exhaust flow rate can be obtained, and good output characteristics can be achieved. However, the above (1) and (2
) It has been confirmed through experiments that if the equation is established, γ of this three-valve internal combustion engine can be kept within the range of the above values.
シリンダヘンド２には吸気ポート１２及び排気ポート１
３が形成されており、吸気ポート１２は、その内端側が
第１．第２分岐ポー）１２１，１２２に分れていて前記
第１．第２吸気弁口９７，９□に連なり、その外端はシ
リンダヘンド２の一側面に開口し、その附口部に気化器
その他の燃料供給装置に連なる吸気管１４が連結される
。このようにシリンダヘッド２内で吸気ボート１２を分
岐させれば、吸気管１４０通路構造を単純化させること
ができる。一方、排気ボート１３は内端が前記排気弁口
１０に連なり、その外端はシリンダヘンド２の他側面に
開口し、その開口部に排気管（図示せず）が連結される
。Cylinder head 2 has an intake port 12 and an exhaust port 1
3 is formed, and the intake port 12 has a first . The first branch port is divided into 121 and 122. It is connected to the second intake valve ports 97, 9□, and its outer end opens to one side of the cylinder head 2, and an intake pipe 14 connected to a carburetor or other fuel supply device is connected to the opening. By branching the intake boat 12 within the cylinder head 2 in this manner, the structure of the intake pipe 140 passage can be simplified. On the other hand, the exhaust boat 13 has its inner end connected to the exhaust valve port 10, and its outer end opens to the other side of the cylinder head 2, and an exhaust pipe (not shown) is connected to the opening.
第１．第２吸気弁口９１，９□並びに排気弁口１０は、
シリンダヘンド２に弁ガイド１５１，１５２゜１６を介
して摺動自在に支承される第１．第２吸気弁１７．．１
７．並びに排気弁１８によってそれぞれ開閉されるよう
になっており、これらの弁は図示しない公知の動弁機構
によって開閉作動される。1st. The second intake valve ports 91, 9□ and the exhaust valve port 10 are
The first valve is slidably supported on the cylinder head 2 via valve guides 151, 152°16. Second intake valve 17. ．． 1
7. These valves are opened and closed by a known valve mechanism (not shown).
図示例のように、第１．第２吸気弁口９１．９□の有効
面積Ａｉ、、Ａｉ２を略等しくする場合には、前記（１
）式から排気弁口１０の有効面積Ａｔは１個の吸気弁口
９１ （９２）の有効面積Ａｌｔ （ＡＬ２ ）のそ
れより犬となるから、排気弁１８の傘部は１個の吸気弁
１７１ （１７２）の傘部より大径 となる。このよ
うな吸、排気弁１７１．１７２ ；１８の傘部を可及
的大きく形成すると共に燃焼室６の天井斜面７１．７□
に沿って配置することを可能にするために、吸気弁１７
．．１７□の弁杆とシリンダ４軸線とのなす角を０１、
排気弁１８の弁杆とシリンダ４軸線とのなす角をθ２と
するとき、とすることが望ましい。As in the illustrated example, the first. When the effective areas Ai, , Ai2 of the second intake valve port 91.9□ are made approximately equal, the above (1
), the effective area At of the exhaust valve port 10 is smaller than that of the effective area Alt (AL2) of one intake valve port 91 (92), so the umbrella portion of the exhaust valve 18 is equal to one intake valve 171. It has a larger diameter than the umbrella part of (172). Such intake and exhaust valves 171, 172; 18 are made as large as possible, and the ceiling slope 71, 7□ of the combustion chamber 6 is
In order to allow for placement along the intake valve 17
．． ．． The angle between the valve rod of 17□ and the 4th axis of the cylinder is 01,
It is desirable that the angle between the valve rod of the exhaust valve 18 and the axis of the cylinder 4 be θ2.
第４図は本発明の第２実施例を示すものであって、燃焼
室６の天井斜面７２の主として第２吸気弁口９□に対向
する部分、図示例では燃焼室６０周縁と、第２吸気弁口
９２、排気弁口１０及び点火栓１１の電極部とにより囲
まれる略三日月状区域にスキンシュ部１９を形成した点
を除けば前実施例と略同様構成であり、図中、前実施例
と対応する部分には同一符号を付す。FIG. 4 shows a second embodiment of the present invention, in which the ceiling slope 72 of the combustion chamber 6 mainly faces the second intake valve port 9□, in the illustrated example, the peripheral edge of the combustion chamber 60 and the second The structure is substantially the same as that of the previous embodiment, except that the skin part 19 is formed in the approximately crescent-shaped area surrounded by the intake valve port 92, the exhaust valve port 10, and the electrode part of the spark plug 11. Parts corresponding to those in the example are given the same reference numerals.
上記スキッシュ部１９の底面、即ちスキッシュ面１９α
は、シリンダヘンド４のシリンダブロック１に対する接
合面と略同一平面に形成されていて、ピストン５の圧縮
行程時、その上面と協働して燃焼室６内の混合気にスキ
ッシュを与えるもので、これにより圧縮比を高めて熱効
率を向上させると共に、混合気の流動を強化して火焔の
伝播速度を速め、アンチノッキング性を向上させること
ができる。また上記スキンシュ部１９の側面１９ｈは、
吸気弁１７７，１７２から燃焼室６に流入してくる混合
気の方向に対して成る角度で傾斜するように形成されて
いて、流入混合気に対しスワールを与えるようになって
おり、これによっても燃焼室６における混合気の流動が
強化されるので、アンチノンキング性は一層助長される
。The bottom surface of the squish portion 19, that is, the squish surface 19α
is formed approximately on the same plane as the joining surface of the cylinder hend 4 to the cylinder block 1, and cooperates with its upper surface to give squish to the air-fuel mixture in the combustion chamber 6 during the compression stroke of the piston 5. This not only increases the compression ratio and improves thermal efficiency, but also strengthens the flow of the air-fuel mixture, increases the flame propagation speed, and improves anti-knocking properties. In addition, the side surface 19h of the skin part 19 is
They are formed to be inclined at an angle to the direction of the air-fuel mixture flowing into the combustion chamber 6 from the intake valves 177, 172, and are designed to give a swirl to the inflowing air-fuel mixture. Since the flow of the air-fuel mixture in the combustion chamber 6 is strengthened, the anti-nonking property is further promoted.
第５図は本発明の第３実施例を示すものであって、燃焼
室６の天井斜面７１．７□の各下端部にスキッシュ部２
０．２１を形成した点を除けば前記第１実施例と略同様
構成であり、図中前記第１実施例と対応する部分には同
一符号を付す。FIG. 5 shows a third embodiment of the present invention, in which squish portions 2 are attached to each lower end of the ceiling slope 71.7□ of the combustion chamber 6.
The structure is substantially the same as that of the first embodiment except that 0.21 is formed, and the same reference numerals are given to the parts corresponding to those of the first embodiment in the drawings.
以上のように本発明によれば、シリンダ上部の燃焼室の
天井面を略中央部の稜線から両側に向って下る二つの天
井斜面より構成し、一方の天井斜面に１対の第１．第２
吸気弁口を前記稜線に沿い並列して開口し、他方の天井
斜面には、前記第１吸気弁口との対向位置で１個の排気
弁口を開口すると共に、前記第２吸気弁口との対面位置
で点火源を配設したので、点火源を前記第１．第２吸気
弁口及び排気弁口に殆んど邪魔されることなく燃焼室の
中心部に近付けて点火源から燃焼室周縁までの距離な略
等しくすることができ、その結果燃焼室における火焔の
伝播距離が短縮してアンチノンキング性を向上させるこ
とができる。As described above, according to the present invention, the ceiling surface of the combustion chamber in the upper part of the cylinder is constituted by two ceiling slopes descending from a ridgeline in the substantially central part toward both sides, and one ceiling slope has a pair of first and second slopes. Second
Intake valve ports are opened in parallel along the ridgeline, and one exhaust valve port is opened on the other ceiling slope at a position opposite to the first intake valve port, and one exhaust valve port is opened in a position opposite to the first intake valve port. Since the ignition source was disposed at a position facing the first. The distance from the ignition source to the periphery of the combustion chamber can be made close to the center of the combustion chamber without being hindered by the second intake valve port and the exhaust valve port, and as a result, the flame in the combustion chamber can be The propagation distance is shortened and the anti-nonking property can be improved.
また、前記第１．第２吸気弁口の有効面積をＡｔｅ。In addition, the above-mentioned No. 1. The effective area of the second intake valve port is Ate.
Ａｚ２．前記排気弁口の有効面積なＡｅ、前記シリンダ
の断面積をＡｃとするとき、
上記（ｌｌ 、 （２１式を成立させたので、吸気流量
と排気流量の適正なマツチングが得られ、高速出力性能
を一段と向上させることができる。Az2. When the effective area of the exhaust valve port is Ae, and the cross-sectional area of the cylinder is Ac, then (ll, (21) is established, so proper matching of the intake flow rate and exhaust flow rate can be obtained, and high-speed output performance is achieved. can be further improved.
第１ないし第３図は本発明の第１実施例を示すもので、
第１図はシリンダヘッドの底面図、第２及び第３図は第
１図の■−■及びｔｎ−ｔｎ線にそれぞれ沿った内燃機
関の縦断面図、第４図は本発明の第２実施例を示すシリ
ンダヘッドの底面図、第５図に大木発明の第３実施例を
示すシリンダヘッドの底面図である。
Ｅ・・・内燃機関、
２・・・シリンダヘッド、４・・・シリンダ、５・・・
ピストン、６・・・燃焼室、７・・・天井面、７１．７
２・・・天井斜面、′８・・・稜線、９．．９２・・・
第１．第２吸気弁口、１０・・・排気弁口、１１・・・
点火怜、１２・・・吸気ポート、１２Ｉ 、１２□・・
・第１．第２分岐ポート、１３・・・排気ポート、１７
１，１７２ ・・・第１゜第２吸気弁、１８・・・排気
弁
特許出願人 本田技研工業株式会社
第３図
１９
第２図
Ｑ
特許庁長官殿
１．事件の表示
昭和５７年 特 願第２０３２８９号
２、発明の名称
３弁式内燃機関
３、補正をする者
事件との関係特許出願人
名 称 （５３２）本田技研工業株式会社４、代
理 人 〒１０５
電話東京４３４−４１５１
５補正命令の日付
昭和５８年２月２日（発送日：昭和５８年２月２２日）
１２０−1 to 3 show a first embodiment of the present invention,
Fig. 1 is a bottom view of the cylinder head, Figs. 2 and 3 are longitudinal sectional views of the internal combustion engine taken along the lines ■-■ and tn-tn in Fig. 1, respectively, and Fig. 4 is a second embodiment of the present invention. FIG. 5 is a bottom view of a cylinder head showing an example, and FIG. 5 is a bottom view of a cylinder head showing a third embodiment of Oki's invention. E... Internal combustion engine, 2... Cylinder head, 4... Cylinder, 5...
Piston, 6... Combustion chamber, 7... Ceiling surface, 71.7
2...Ceiling slope, '8...Ridge line, 9. ．． 92...
1st. Second intake valve port, 10... Exhaust valve port, 11...
Ignition, 12...Intake port, 12I, 12□...
・First. Second branch port, 13...Exhaust port, 17
1,172 ... 1st ° 2nd intake valve, 18 ... Exhaust valve Patent applicant Honda Motor Co., Ltd. Figure 3 19 Figure 2 Q Dear Commissioner of the Japan Patent Office 1. Description of the case 1983 Patent Application No. 203289 2 Name of the invention 3-valve internal combustion engine 3 Person making the amendment Name of patent applicant related to the case (532) Honda Motor Co., Ltd. 4, Representative
Director Address: 105 Telephone: Tokyo 434-4151 5. Date of amendment order: February 2, 1982 (Shipping date: February 22, 1980)
120-
Claims (1)
から両側に向って下る二つの天井斜面より構成し、一方
の天井斜面に１対の第１．第２吸気弁口を前記稜線に涜
い並列して開口し、他方の天井斜面には、前記第１吸気
弁口との対向位置で１個の排気弁口を開口すると共に前
記第２吸気弁口との対向位置で点火源を配設し、前記第
１．第２吸気弁口の有効面積なＡｉ、、Ａｉ２、前記排
気弁口の有効面積なＡ ｅ 、前記シリンダの断面積を
Ａｃとするとき、 上記（１１、（２１式を成立させた、３弁式内燃機関。 （２、特許請求の範囲第（１）項記載のものにおいて、
前記第１．第２吸気弁口は、機関本体の一側面に開口す
る１本の吸気ボートの途中から分けられた第１．第２分
岐ボートにそれぞれ連なる、３弁式(1) The ceiling surface of the combustion chamber in the upper part of the cylinder is composed of two ceiling slopes descending from a ridgeline in the approximate center toward both sides, and one ceiling slope has a pair of first and second slopes. A second intake valve port is opened parallel to the ridge line, and an exhaust valve port is opened on the other ceiling slope at a position opposite to the first intake valve port, and a second intake valve port is opened in parallel with the ridge line. An ignition source is disposed at a position facing the mouth, and the first. When the effective area of the second intake valve port is Ai, Ai2, the effective area of the exhaust valve port is Ae, and the cross-sectional area of the cylinder is Ac, then type internal combustion engine. (2. In the product described in claim (1),
Said 1st. The second intake valve port is the first intake valve port, which is separated from the middle of one intake boat that opens on one side of the engine body. Three-valve type, each connected to the second branch boat
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57203289A JPS5993921A (en) | 1982-11-19 | 1982-11-19 | 3-valve type internal-combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57203289A JPS5993921A (en) | 1982-11-19 | 1982-11-19 | 3-valve type internal-combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5993921A true JPS5993921A (en) | 1984-05-30 |
| JPH0114406B2 JPH0114406B2 (en) | 1989-03-10 |
Family
ID=16471572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57203289A Granted JPS5993921A (en) | 1982-11-19 | 1982-11-19 | 3-valve type internal-combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5993921A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04137782U (en) * | 1991-06-20 | 1992-12-22 | セイレイ工業株式会社 | Remaining grain discharge device in rotary sorting huller |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4057725B2 (en) | 1998-11-25 | 2008-03-05 | 本田技研工業株式会社 | Horizontally opposed 4-cycle engine for motorcycles |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5644418A (en) * | 1979-09-20 | 1981-04-23 | Honda Motor Co Ltd | Device for improving combustion of mixture in four-cycle internal combustion engine |
-
1982
- 1982-11-19 JP JP57203289A patent/JPS5993921A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5644418A (en) * | 1979-09-20 | 1981-04-23 | Honda Motor Co Ltd | Device for improving combustion of mixture in four-cycle internal combustion engine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04137782U (en) * | 1991-06-20 | 1992-12-22 | セイレイ工業株式会社 | Remaining grain discharge device in rotary sorting huller |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0114406B2 (en) | 1989-03-10 |
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