JPH11287124A - Two-cycle gasolin engine - Google Patents
Two-cycle gasolin engineInfo
- Publication number
- JPH11287124A JPH11287124A JP10420098A JP10420098A JPH11287124A JP H11287124 A JPH11287124 A JP H11287124A JP 10420098 A JP10420098 A JP 10420098A JP 10420098 A JP10420098 A JP 10420098A JP H11287124 A JPH11287124 A JP H11287124A
- Authority
- JP
- Japan
- Prior art keywords
- port
- piston
- combustion chamber
- exhaust
- gas
- 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.)
- Pending
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
- F02F1/18—Other cylinders
- F02F1/22—Other cylinders characterised by having ports in cylinder wall for scavenging or charging
-
- 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
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、例えば刈払機等
に使用される２サイクルガソリンエンジンに係り、詳し
くは燃焼効率の向上と排ガス中のＴＨＣの減少を図る２
サイクルガソリンエンジンに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-stroke gasoline engine used for, for example, a bush cutter, and more particularly, to improving combustion efficiency and reducing THC in exhaust gas.
It relates to a cycle gasoline engine.
【０００２】[0002]
【従来の技術】２サイクルガソリンエンジンでは、高出
力を実現するため吸気、掃気、排気のすべてが高効率で
ガス交換できるように設計されている。しかし、シリン
ダ内の掃気と排気を同時に行う基本構造上、掃気口より
燃焼室内に流入した新しいガスがそのまま排気口より流
出してしまうため（以下吹き抜けという）、吹き抜けに
よる未燃焼ガスが排気ガスに混入し、排ガス中のＴＨＣ
を増大させていた。2. Description of the Related Art A two-cycle gasoline engine is designed so that all of intake, scavenging, and exhaust gas exchange can be performed with high efficiency in order to achieve high output. However, due to the basic structure that simultaneously performs scavenging and exhaust in the cylinder, new gas that has flowed into the combustion chamber from the scavenging port flows out of the exhaust port as it is (hereinafter referred to as blow-through). THC in exhaust gas
Was increasing.
【０００３】排ガス中のＴＨＣは上述したような吹き抜
けによるものの他、残りは一度燃焼室内に封入され燃焼
工程を経てもなお未燃焼ガスとして残ったものの排出と
いうことになる。したがって、燃焼効率を向上させれば
ＴＨＣを低下させつつ出力も向上させることができる
が、これには、燃焼室の形状及び掃気の流れの改善によ
る方法の他、排気口の開いているクランク軸角度範囲を
小さくして新しいガスの吹き抜け量を減らすとともに燃
焼室内における燃焼済みガスの残留量を僅かに増大させ
新しいガスの燃焼をしやすくして燃焼効率を上げる方法
がある。[0003] In addition to the above-mentioned blow-by, THC in the exhaust gas is the remaining one which is sealed in the combustion chamber once and remains as unburned gas even after the combustion process. Therefore, if the combustion efficiency is improved, the output can be improved while lowering the THC. This includes a method by improving the shape of the combustion chamber and the flow of scavenging gas, and a crankshaft having an open exhaust port. There is a method in which the angle range is reduced to reduce the blow-through amount of new gas, and the residual amount of burned gas in the combustion chamber is slightly increased to facilitate combustion of the new gas to increase the combustion efficiency.
【０００４】[0004]
【発明が解決しようとする課題】吹き抜けによるＴＨＣ
を減少させるため排気効率を落とせば出力低下を招く。
高効率のガス交換による出力向上と吹き抜け防止による
ＴＨＣ低下の両方の実現には矛盾があるため、双方のバ
ランスを取ることで改良を行うしかない。SUMMARY OF THE INVENTION
If the exhaust efficiency is reduced in order to reduce the power consumption, the output will decrease.
There is a contradiction between the realization of both the improvement of the output by high-efficiency gas exchange and the reduction of the THC by the prevention of blow-through.
【０００５】また、燃焼室の形状及び掃気の流れの改善
による燃焼効率の向上には限界があり、排気口の開いて
いるクランク軸角度範囲を小さくする方法では前述の排
気効率の低下による出力の低下をまねく。[0005] Further, there is a limit in improving the combustion efficiency by improving the shape of the combustion chamber and the flow of the scavenging air. In the method of reducing the crankshaft angle range in which the exhaust port is open, the above-described output reduction due to the decrease in the exhaust efficiency is performed. Leads to a drop.
【０００６】本発明の目的は、上記問題点を克服する２
サイクルガソリンエンジンを提供することである。It is an object of the present invention to overcome the above problems.
To provide a cycle gasoline engine.
【０００７】[0007]
【課題を解決するための手段】この発明の請求項１記載
の２サイクルガソリンエンジンにおいては、シリンダ
（１）内に形成される燃焼室（９）に開口する排気口
（３）と、燃焼室（９）に開口しクランク室（４）に連
通する掃気口（５）と、往復動によって燃焼室（９）及
びクランク室（４）の容積の増減を行うとともに排気口
（３）及び掃気口（５）の開閉を行うピストン（８）
と、排気口（３）及び掃気口（５）が閉塞されるある特
定位置にピストン（８）が位置するときにのみ排気口
（３）と掃気口（５）を連通させる連通路（１０）とを
有しているので、これにより、新しいガスの充填より先
のタイミングで、未燃焼ガスを含む排気ガスの一部を燃
焼室（９）に循環させることが可能となるので、排ガス
中のＴＨＣの濃度は減少する。According to a first aspect of the present invention, there is provided a two-stroke gasoline engine, comprising: an exhaust port (3) opening to a combustion chamber (9) formed in a cylinder (1); A scavenging port (5) that opens to (9) and communicates with the crank chamber (4); and a reciprocating motion that increases and decreases the volumes of the combustion chamber (9) and the crank chamber (4), and exhaust port (3) and scavenging port. Piston (8) that opens and closes (5)
A communication path (10) for communicating the exhaust port (3) and the scavenging port (5) only when the piston (8) is located at a specific position where the exhaust port (3) and the scavenging port (5) are closed. Therefore, a portion of the exhaust gas including the unburned gas can be circulated to the combustion chamber (9) at a timing prior to the charging of the new gas, so that the The concentration of THC decreases.
【０００８】この発明の請求項２記載の２サイクルガソ
リンエンジンにおいては、請求項１記載の２サイクルガ
ソリンエンジンにおいて、前記連通路（１０）を、前記
ピストン（８）の側面に形成した帯状の溝（１０）とす
ることによって、前記連通路（１０）の形成を容易に行
うことができる。In the two-stroke gasoline engine according to the second aspect of the present invention, in the two-stroke gasoline engine according to the first aspect, the communication passage (10) is formed in a band-like groove formed on a side surface of the piston (8). With the configuration (10), the communication path (10) can be easily formed.
【０００９】[0009]
【発明の実施の形態】以下、発明の実施の形態について
図面を参照して説明する。図１はピストン８が上死点付
近に位置する状態を示し、図２はピストン８が下死点付
近に位置する状態を示す。図面ではこの種の２サイクル
ガソリンエンジンにおいて、慣用の手段、例えば、点火
プラグ、ピストンリング、気化器、各種ポートへの接続
管の構成を省略して説明する。シリンダ１の内周壁１１
にはピストン８が摺動自在に嵌挿され、ピストン８の往
復運動はコネクティングロッド７を介してクランク軸６
の回転運動に変換される。シリンダ１の下方にはクラン
クケース１４が装着され、シリンダ１内のピストン８上
部には燃焼室９が形成され、シリンダ１内のピストン８
下部とクランクケース１４内部とからなる空間にはクラ
ンク室４が形成される。シリンダ１側部には吸気口２、
排気口３及び掃気口５が設けられる。吸気口２はクラン
ク室４に開口してピストン８の往復動によりクランク室
４に対する開閉を行う。排気口３は燃焼室９に開口して
ピストン８の往復動により燃焼室９に対する開閉を行
う。掃気口５は燃焼室９に開口する一方クランク室４に
も連通しており、ピストン８の往復動により燃焼室９に
対する開閉を行い燃焼室９とクランク室４の連通・遮断
を行う。ピストン８の側面には帯状の溝１０が形成され
る。ピストン８が、排気口３と掃気口５が燃焼室９に対
して閉塞されるある特定位置にあるとき（例えば図１の
状態）のみ、排気口３は溝１０を介して掃気口５からク
ランク室４に連通することとなり、ピストン８が他の位
置にあるときには溝１０はシリンダ１の内周壁１１との
間で閉塞される。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a state where the piston 8 is located near the top dead center, and FIG. 2 shows a state where the piston 8 is located near the bottom dead center. In the drawings, a description will be given of a two-stroke gasoline engine of this type by omitting configurations of conventional means such as a spark plug, a piston ring, a carburetor, and connecting pipes to various ports. Inner peripheral wall 11 of cylinder 1
A piston 8 is slidably inserted into the shaft 6, and the reciprocating motion of the piston 8 is transmitted through the connecting rod 7 to the crankshaft 6.
Is converted into a rotational motion. A crankcase 14 is mounted below the cylinder 1, and a combustion chamber 9 is formed above the piston 8 in the cylinder 1.
A crank chamber 4 is formed in a space defined by the lower portion and the inside of the crankcase 14. An intake port 2 on the side of the cylinder 1
An exhaust port 3 and a scavenging port 5 are provided. The intake port 2 opens into the crank chamber 4 and opens and closes the crank chamber 4 by reciprocation of the piston 8. The exhaust port 3 opens to the combustion chamber 9 and opens and closes the combustion chamber 9 by reciprocation of the piston 8. The scavenging port 5 is open to the combustion chamber 9 and also communicates with the crank chamber 4. The reciprocating motion of the piston 8 opens and closes the combustion chamber 9 to communicate and shut off the combustion chamber 9 and the crank chamber 4. A band-shaped groove 10 is formed on a side surface of the piston 8. Only when the piston 8 is at a specific position where the exhaust port 3 and the scavenging port 5 are closed with respect to the combustion chamber 9 (for example, in the state of FIG. 1), the exhaust port 3 is cranked from the scavenging port 5 through the groove 10. The groove 10 communicates with the chamber 4, and when the piston 8 is at another position, the groove 10 is closed between the groove 10 and the inner peripheral wall 11 of the cylinder 1.
【００１０】排気ガス中にＴＨＣ成分が含まれるメカニ
ズムについて述べる。ガソリンは炭素と水素の化合物で
あるため、完全燃焼すればすべて無害な二酸化炭素と水
に変わる。したがって、排気ガス中で検出されるＴＨＣ
の成分は、燃焼せずに排出されてしまったガスというこ
とになり、具体的には、燃焼室９内での燃焼時に燃えの
こったガスと燃焼工程を経ることなく排気口３から吹き
抜けてしまったガスの二通りが考えられる。The mechanism by which the exhaust gas contains the THC component will be described. Since gasoline is a compound of carbon and hydrogen, it can be completely converted to harmless carbon dioxide and water when completely burned. Therefore, THC detected in exhaust gas
Is a gas that has been exhausted without being burnt. Specifically, the gas that has burned during combustion in the combustion chamber 9 has blown out of the exhaust port 3 without going through the combustion process. There are two types of gas.
【００１１】ピストン８が上死点付近にあるとき、燃焼
室９内で圧縮された混合気は点火・燃焼し、爆発膨張し
てピストン８を押し下げる。ピストン８が下がるにつれ
排気口３が徐々に開き燃焼室９内の燃焼したガスはシリ
ンダ１の外へと排出される。排気口３が開いてからまも
なく掃気口５が開き、さらにピストン８が下がると、ク
ランク室４の混合ガス（新気）が燃焼室９へ充填され
る。このとき、排気口３と掃気口５が同時に開いている
ため、クランク室４から燃焼室９へ流入する新気の一部
はそのまま排気口３からシリンダ１の外に排出されてし
まう。また、ピストン８は下死点を通過し再び上昇し始
めるが、ピストン８が排気口を閉塞し圧縮工程に入るま
での間、排気口３は徐々に開口面積を狭めながらも開い
ているため、燃焼済みガスと新気の一部が一緒に排出さ
れてしまう。この新気の吹き抜けが排気ガス中のＴＨＣ
を増大させる。When the piston 8 is near the top dead center, the air-fuel mixture compressed in the combustion chamber 9 ignites and burns, explodes and expands, and pushes down the piston 8. As the piston 8 is lowered, the exhaust port 3 is gradually opened, and the burned gas in the combustion chamber 9 is discharged out of the cylinder 1. Shortly after the opening of the exhaust port 3, the scavenging port 5 is opened, and when the piston 8 is further lowered, the mixed gas (fresh air) in the crank chamber 4 is filled into the combustion chamber 9. At this time, since the exhaust port 3 and the scavenging port 5 are open at the same time, part of the fresh air flowing from the crank chamber 4 into the combustion chamber 9 is directly discharged from the exhaust port 3 to the outside of the cylinder 1. Further, the piston 8 passes through the bottom dead center and starts to rise again. However, the exhaust port 3 is open while the opening area is gradually reduced until the piston 8 closes the exhaust port and enters the compression process. Burned gas and some of the fresh air are discharged together. THC in the exhaust gas
Increase.
【００１２】掃気口５と排気口３が閉じた後、さらにピ
ストン８が上昇して、吸気口２がクランク室４に開口す
ると、クランク室４は負圧となっているので、気化器よ
り供給される混合ガス（新気）は吸気口２よりクランク
室４に流入する。さらに、ピストン８の側面に形成され
た帯状の溝１０が排気口３及び掃気口５に連通する位置
までピストン８が上昇すると、排気口３より、排出され
た新気を含む燃焼済みガスの一部は、溝１０を通過して
掃気口５に流入し、排気ガス中のＴＨＣの絶対量は減少
する。再びピストン８が上死点通過後下降して、排気口
３と掃気口５が燃焼室９に開口したとき、初めに掃気口
５に滞留していた燃焼済みガスが燃焼室９内へと流入
し、続いてクランク室４の新気がこ燃焼室９へ充填され
る。こうして、初期の吹き抜け成分は循環した燃焼済み
ガスで多くを占められ新気の吹き抜け量が減少し、排ガ
ス中のＴＨＣの濃度は減少する。After the scavenging port 5 and the exhaust port 3 are closed, the piston 8 further rises and the intake port 2 opens into the crank chamber 4. When the crank chamber 4 has a negative pressure, it is supplied from the carburetor. The mixed gas (fresh air) flows into the crank chamber 4 from the intake port 2. Further, when the piston 8 rises to a position where the band-shaped groove 10 formed on the side surface of the piston 8 communicates with the exhaust port 3 and the scavenging port 5, one of the burned gases including fresh air discharged from the exhaust port 3 is removed. The part flows into the scavenging port 5 through the groove 10, and the absolute amount of THC in the exhaust gas decreases. When the piston 8 descends again after passing through the top dead center, and the exhaust port 3 and the scavenging port 5 are opened to the combustion chamber 9, the burned gas initially retained in the scavenging port 5 flows into the combustion chamber 9. Then, fresh air in the crank chamber 4 is charged into the combustion chamber 9. In this manner, the initial blow-by component is mainly occupied by the circulated burned gas, the blow-through amount of fresh air is reduced, and the THC concentration in the exhaust gas is reduced.
【００１３】また、この高温の燃焼済みガスを新気に混
合して燃焼室９内で燃焼させれば燃焼を促進させ、燃焼
効率を高めることが出来る。一般に、新気の充填効率を
落とせば出力は低下するが、燃焼を悪化させない程度の
量の燃焼済みガスの循環であれば、出力を低下させるこ
となく燃焼効率を向上させ、さらにＴＨＣを減少させる
ことができる。If this high-temperature burned gas is mixed with fresh air and burned in the combustion chamber 9, the combustion is promoted and the combustion efficiency can be increased. In general, if the efficiency of charging fresh air is reduced, the output will be reduced. However, if the amount of burned gas is such that the combustion is not deteriorated, the combustion efficiency is improved without lowering the output and the THC is further reduced. be able to.
【００１４】[0014]
【発明の効果】この発明によれば上述の通り、排気ガス
中に含まれるＴＨＣを低減できる。すなわち従来吹き抜
けを防止するため排気効率を下げると出力低下を招き、
十分に排気効率を下げることは困難であったが、新気よ
りも先のタイミングで燃焼済みガスを燃焼室８内に循環
させることで、燃焼効率を上昇させ、それによって、排
気ガス中のＴＨＣを濃度を低減し、出力を確保したまま
ＴＨＣを低減させることを可能としたのである。According to the present invention, as described above, THC contained in exhaust gas can be reduced. That is, if the exhaust efficiency is reduced to prevent blow-through in the past, the output will decrease,
Although it has been difficult to sufficiently reduce the exhaust efficiency, the combustion efficiency is increased by circulating the burned gas into the combustion chamber 8 at a timing earlier than the fresh air, thereby increasing the THC in the exhaust gas. It was possible to reduce THC while maintaining the output while reducing the concentration.
【図１】この発明の一実施形態におけるピストンが上死
点付近に位置する状態を示す断面図である。FIG. 1 is a sectional view showing a state in which a piston according to an embodiment of the present invention is located near a top dead center.
【図２】この発明の一実施形態におけるピストンが下死
点付近に位置する状態を示す断面図である。FIG. 2 is a cross-sectional view showing a state in which a piston according to an embodiment of the present invention is located near bottom dead center.
１ シリンダ ３ 排気口 ４ クランク室 ５ 掃気口 ８ ピストン ９ 燃焼室 １０ 溝（連通路） DESCRIPTION OF SYMBOLS 1 Cylinder 3 Exhaust port 4 Crank chamber 5 Scavenging port 8 Piston 9 Combustion chamber 10 Groove (communication passage)
Claims (2)
（９）に開口する排気口（３）と、前記燃焼室（９）に
開口しクランク室（４）に連通する掃気口（５）と、往
復動によって前記燃焼室（９）及び前記クランク室
（４）の容積の増減を行うとともに前記排気口（３）及
び掃気口（５）の開閉を行うピストン（８）と、前記排
気口（３）及び前記掃気口（５）が閉塞されるある特定
位置に前記ピストン（８）が位置するときにのみ前記排
気口（３）と前記掃気口（５）を連通させる連通路（１
０）とを有していることを特徴とする２サイクルガソリ
ンエンジン。An exhaust port (3) opening to a combustion chamber (9) formed in a cylinder (1), and a scavenging port (5) opening to the combustion chamber (9) and communicating with a crank chamber (4). ), A piston (8) for increasing and decreasing the volumes of the combustion chamber (9) and the crank chamber (4) by reciprocating motion, and opening and closing the exhaust port (3) and the scavenging port (5); A communication path (1) that allows the exhaust port (3) to communicate with the scavenging port (5) only when the piston (8) is located at a specific position where the port (3) and the scavenging port (5) are closed.
0) a two-cycle gasoline engine.
（８）の側面に形成した帯状の溝（１０）であることを
特徴とする請求項１記載の２サイクルガソリンエンジ
ン。2. A two-stroke gasoline engine according to claim 1, wherein said communication passage is a band-shaped groove formed in a side surface of said piston.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10420098A JPH11287124A (en) | 1998-04-01 | 1998-04-01 | Two-cycle gasolin engine |
| US09/409,265 US6173683B1 (en) | 1998-01-04 | 1999-09-30 | Two-stroke cycle engine |
| TW088116864A TW403811B (en) | 1998-04-01 | 1999-09-30 | Two-stroke cycle engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10420098A JPH11287124A (en) | 1998-04-01 | 1998-04-01 | Two-cycle gasolin engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11287124A true JPH11287124A (en) | 1999-10-19 |
Family
ID=14374342
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10420098A Pending JPH11287124A (en) | 1998-01-04 | 1998-04-01 | Two-cycle gasolin engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11287124A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7066119B2 (en) | 2004-02-19 | 2006-06-27 | Maruyama Mfg. Co., Inc. | Two-stroke engine |
| WO2009093310A1 (en) * | 2008-01-23 | 2009-07-30 | Shindaiwa Corporation | Two-stroke engine |
| JP2015059533A (en) * | 2013-09-19 | 2015-03-30 | 宏志 関田 | Stirling heat engine |
| JP2016160835A (en) * | 2015-03-02 | 2016-09-05 | 株式会社丸山製作所 | Two-cycle engine |
| ITUA20164358A1 (en) * | 2016-06-14 | 2017-12-14 | Emak Spa | TWO STROKE INTERNAL COMBUSTION ENGINE |
| CN113503214A (en) * | 2021-07-19 | 2021-10-15 | 浙江派尼尔科技股份有限公司 | Closed low-exhaust backflow scavenging passage cylinder for small gasoline engine |
-
1998
- 1998-04-01 JP JP10420098A patent/JPH11287124A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7066119B2 (en) | 2004-02-19 | 2006-06-27 | Maruyama Mfg. Co., Inc. | Two-stroke engine |
| WO2009093310A1 (en) * | 2008-01-23 | 2009-07-30 | Shindaiwa Corporation | Two-stroke engine |
| JP2015059533A (en) * | 2013-09-19 | 2015-03-30 | 宏志 関田 | Stirling heat engine |
| JP2016160835A (en) * | 2015-03-02 | 2016-09-05 | 株式会社丸山製作所 | Two-cycle engine |
| US10190534B2 (en) | 2015-03-02 | 2019-01-29 | Maruyama Mfg. Co., Inc. | Two-cycle engine |
| ITUA20164358A1 (en) * | 2016-06-14 | 2017-12-14 | Emak Spa | TWO STROKE INTERNAL COMBUSTION ENGINE |
| WO2017216665A1 (en) * | 2016-06-14 | 2017-12-21 | Emak S.P.A. | A two-stroke internal combustion engine |
| CN109312689A (en) * | 2016-06-14 | 2019-02-05 | 意玛克股份公司 | Two-stroke internal combustion engine |
| US10823046B2 (en) | 2016-06-14 | 2020-11-03 | Emak S.P.A. | Two-stroke internal combustion engine |
| CN109312689B (en) * | 2016-06-14 | 2021-08-17 | 意玛克股份公司 | Two-stroke internal combustion engine |
| CN113503214A (en) * | 2021-07-19 | 2021-10-15 | 浙江派尼尔科技股份有限公司 | Closed low-exhaust backflow scavenging passage cylinder for small gasoline engine |
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