JPS59170423A - Laminar scavenging 2-cycle engine - Google Patents
Laminar scavenging 2-cycle engineInfo
- Publication number
- JPS59170423A JPS59170423A JP4653283A JP4653283A JPS59170423A JP S59170423 A JPS59170423 A JP S59170423A JP 4653283 A JP4653283 A JP 4653283A JP 4653283 A JP4653283 A JP 4653283A JP S59170423 A JPS59170423 A JP S59170423A
- Authority
- JP
- Japan
- Prior art keywords
- scavenging
- hole
- small
- holes
- air
- 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
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B25/00—Engines characterised by using fresh charge for scavenging cylinders
- F02B25/20—Means for reducing the mixing of charge and combustion residues or for preventing escape of fresh charge through outlet ports not provided for in, or of interest apart from, subgroups F02B25/02 - F02B25/18
- F02B25/22—Means for reducing the mixing of charge and combustion residues or for preventing escape of fresh charge through outlet ports not provided for in, or of interest apart from, subgroups F02B25/02 - F02B25/18 by forming air cushion between charge and combustion residues
-
- 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)
- Supercharger (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
Description
【発明の詳細な説明】
本発明はクランク室圧縮層状帰気２サイクル機閃に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a crankcase compressed stratified return air two-cycle flash.
本発明は掃気のシリンダへの層状掃気を行なうことによ
って、燃料の排気への吹き抜けを極力低減させ、熱効率
の向上と排気浄化とを同時に連成することを目的とする
。An object of the present invention is to perform stratified scavenging of scavenging air into the cylinder, thereby minimizing blow-through of fuel into the exhaust gas, thereby simultaneously improving thermal efficiency and purifying the exhaust gas.
本発明者達は既に掃気効率の高い掃気孔を有する２サイ
クル機関（特許出願日：昭和５７年１２月２７日 発明
の名称；２サイクル機関 特許出願番号： ５７−２３
２５６８ 、および特許出願日：昭和５８年１月１９日
発明の名称：時間差衝突層状掃気２サイクル機関 特
Ｈ′ｌ□出願番号： ５８−００７０８４ ）を発明し
たが、本発明はそれらの発明をさらに発展させたもので
ある。すなわち、上記の既発間において既に掃気のＩｔ
ｊ状化がなされ、熱効率の向上と排気浄化が同時に達成
されでいるが、本発明によって掃気のｊ６状化はさらに
顕著になるところに特徴がある。一本発明の構成はシリ
ンダの対称面に対して左右対称に配置された分割形成さ
れた複数の小掃気孔からなる１４６ ％孔とこれらの小
掃気孔のうち排気孔に最も近いものに空気を供給するこ
と、また場合によってはυト気孔から最も遠い小掃気孔
に燃料の渦い予混合気を供給することよりなる。このよ
うにすることによって掃気のうち吹き抜けやすい部分を
可能な限り空気または燃料の薄い混合気としシリンダ内
に燃料成分を多く留めて熱効率の向上と排気の浄化とを
図ることができる。The inventors of the present invention have already developed a two-cycle engine (patent application date: December 27, 1980, title of invention: two-cycle engine, patent application number: 57-23) having scavenging holes with high scavenging efficiency.
No. 2568, and patent filing date: January 19, 1980, title of invention: Time-lag impingement stratified scavenging two-stroke engine (patent application number: 58-007084), but the present invention further extends those inventions. It has been developed. In other words, the scavenging It
Although the J-shaped configuration has been achieved, improving thermal efficiency and purifying the exhaust gas at the same time, the present invention is characterized in that the J-shaped scavenging becomes even more pronounced. One configuration of the present invention is a 146% hole consisting of a plurality of divided small scavenging holes arranged left and right symmetrically with respect to the symmetry plane of the cylinder, and air is supplied to the one closest to the exhaust hole among these small scavenging holes. supplying and possibly supplying a swirling premixture of fuel to the scavenging holes furthest from the υto pores. By doing so, the part of the scavenging air that is easy to blow through is made into a mixture as thin as possible of air or fuel, and a large amount of the fuel component is retained in the cylinder, thereby improving thermal efficiency and purifying the exhaust gas.
次に本発明の実施例を図によって説明する。Next, embodiments of the present invention will be described with reference to the drawings.
図１に示す２サイクル内燃機関において、ピストン（３
）はシリンダ（１〕内を上下に往復運動し、その際にピ
ストン（３）は１１％孔（１２）、分割された小掃気孔
Ａ、Ｅ、０ｌ−−−１Ｙ、Ｚよりなる掃気孔（６）およ
び排気孔（７）をそれぞれ開閉する。図１はピストン（
５）が下死点の位置で示されている。ピストン（３）が
図１の下死点より上死点方向に移動するとクランク室（
１０）は負圧となるために空気絞り弁（１６）、逆止弁
（１３）、小掃気孔２に連なる副掃気通路（１１）をそ
れぞれ流通し、空気が副掃気通路（１１）内に吸入され
る。吸気孔（１２）がクランク室（１０）に通ずると負
圧によって混合器（１４）、混合気絞り弁（１５）をそ
れぞれ流通し、クランク室（１０）に燃料と空気の混合
気が吸入され、そこに保有される。In the two-stroke internal combustion engine shown in Fig. 1, a piston (3
) reciprocates up and down inside the cylinder (1), and at this time the piston (3) has scavenging holes consisting of the 11% hole (12), divided small scavenging holes A, E, 0l---1Y, and Z. (6) and exhaust hole (7) respectively. Figure 1 shows the piston (
5) is shown at the bottom dead center position. When the piston (3) moves from the bottom dead center to the top dead center in Fig. 1, the crank chamber (
10) flows through the air throttle valve (16), the check valve (13), and the sub-scavenging passage (11) connected to the small scavenging hole 2, so that the air enters the sub-scavenging passage (11). Inhaled. When the intake hole (12) communicates with the crank chamber (10), negative pressure flows through the mixer (14) and the mixture throttle valve (15), and the mixture of fuel and air is sucked into the crank chamber (10). , held therein.
次にピストン（３）が上死点位置から下向きの行程を進
むと、シリンダ側壁の排気孔（７）が開き既燃ガスが排
出され、掃気孔が開く。このとき、排気孔から遠い位置
にあるＡＳＢ、Ｏｌ・・・の不帰気゛孔からは燃料と空
気との混合気が流入し、排気孔に近い小掃気孔・・・％
ＹＮＺからは空気が流入するため主として排気に吹き抜
けるのは小掃気孔・・・、Ｙ、Ｚから流入した空気とい
うことになり、燃料分は多くシリンダ内に留まることに
なる。Next, when the piston (3) moves downward from the top dead center position, the exhaust hole (7) in the cylinder side wall opens and burnt gas is discharged, and the scavenging hole opens. At this time, a mixture of fuel and air flows in from the ASB, Ol, etc. recirculating air holes located far from the exhaust hole, and small scavenging holes near the exhaust hole...%
Since air flows in from YNZ, it is mainly the air that flows through the small scavenging holes, Y, and Z that blows through to the exhaust, and a large amount of fuel remains in the cylinder.
また、燃料供給弁（１７）などを排気孔から遠い小掃気
孔Ａ、Ｂ、Ｏなどに取り付けることによって、さらに掃
気の１・ｉ１状化は顕著になり、燃料分の吹き抜けを低
減できる。各小掃気孔の開閉時期は適宜選定することに
よって燃料吹き抜は鰍の低減効果がさらに増すことは言
うまでもない。図においては混合気のクランクケースへ
の導入にはピストンパルプを、また空気の副掃気通路（
１１）への導入にはリードパルプを用いているが、各々
のパルプの形式に拘束されるものではないＯ混合気絞り
弁θ５）と空気絞り弁（１６）とは図においては連動す
るようになっているが、これも必らずしも連動しなけれ
ばならないということはない。Furthermore, by attaching the fuel supply valve (17) to the small scavenging holes A, B, O, etc. that are far from the exhaust hole, the 1·i1 shape of the scavenging air becomes more pronounced, and the blow-through of fuel can be reduced. It goes without saying that by appropriately selecting the opening and closing timing of each small scavenging hole, the effect of the fuel blower on reducing the number of eels can be further increased. In the figure, the piston pulp is used to introduce the air-fuel mixture into the crankcase, and the air sub-scavenging passage (
Although reed pulp is used for introduction into 11), the type of pulp is not restricted. The O mixture throttle valve θ5) and the air throttle valve (16) are shown to be interlocked in the figure. However, this does not necessarily mean that they must be linked.
図１は混合気通路の長い活性熱雰囲気燃焼２サイクル機
関の場合の例であり、本発明の効果と活性Ｍ雰囲気燃焼
の両方の効果が得られるが、図２は通常の２サイクル機
関のような掃気通路の短い場合の例であって、本発明の
効果は図１の場合とまったく同じである。Figure 1 shows an example of an active hot atmosphere combustion two-stroke engine with a long air-fuel mixture passage, which provides both the effects of the present invention and the effects of activated M atmosphere combustion. This is an example in which the scavenging passage is short, and the effect of the present invention is exactly the same as in the case of FIG.
従来の２サイクル機関においてはピストン（ジが上死点
の位置において掃％孔がクランク室（１０）に開口する
ものが多いが、このような構造は本発明の効果を減する
ことがある。したがってピストン（３）が上死点位置に
おいて、副掃気通路（１１）に連なる小掃気孔２はクラ
ンク室（１０）に開口しないことが望ましい。この場合
不帰気孔Ａ％Ｂ％Ｏ１・・・はピストン（′５）の上死
点位置にてクランク室（１０）に開口しても本発明の効
果は損なわれない。In many conventional two-stroke engines, the cleaning hole opens into the crank chamber (10) when the piston is at top dead center, but such a structure may reduce the effectiveness of the present invention. Therefore, when the piston (3) is at the top dead center position, it is desirable that the small scavenging holes 2 connected to the sub-scavenging passage (11) do not open into the crank chamber (10).In this case, the non-returning holes A%B%O1... Even if the piston ('5) opens into the crank chamber (10) at the top dead center position, the effects of the present invention are not impaired.
図１および２における混合％導入部分と空気導入部分の
位置関係は本発明の制限要因になるものではなく任意の
位置にしてよいものであり、また一体構造とすることも
できるし、本図のように側構造とすることもできる。The positional relationship between the mixing percentage introduction part and the air introduction part in FIGS. 1 and 2 is not a limiting factor for the present invention, and they may be placed in any position, and they may also be of an integral structure. It can also be made into a side structure.
図６は掃気孔部分をシリンダ本体とは別個につくる構造
例を示すもので、このようにすることによって複雑な小
掃気孔およびこれと連通ずる混合′入通路、空気通路な
どがより正確にしかも容易に製造できる。Figure 6 shows an example of a structure in which the scavenging hole portion is made separately from the cylinder body. By doing so, the complicated small scavenging holes, the mixing inlet passage, the air passage, etc. that communicate with the small scavenging holes can be formed more accurately. Easy to manufacture.
本発明によって燃料成分の排気への吹き抜は量を低減で
き、燃焼の安定化を計ることが可能となり、熱効率の向
上と＃Ｐ気気化化を同時に達成することができた。According to the present invention, the amount of fuel components blown into the exhaust gas can be reduced, combustion can be stabilized, and thermal efficiency can be improved and #P vaporization can be achieved at the same time.
図１および２は本発明の実施例の縦断側面図を示す一６
図６は本発明のうち小掃気孔に分割した掃気孔をシリン
ダとは別個につくるＩｉ＃造例を示す。
図において、（１）・・・シリンダ、（２）・・・燃焼
室、（５）・・・ピストン、（４）・・・クランクケー
ス、（５）・・・点火プラグ、（６）・・・小掃気孔に
分割された掃気孔、（７＞・・・排気孔、（８）・・・
混合気掃気通路、（９）・・・混合気掃気通路入口、（
１０）・・・クランク室、（１１）・・・副掃気通路、
（１２）・・・吸気孔、（１５）・・・逆止弁、（１４
）・・・混合器、（１５）・・・混合気絞り弁、（１６
）・・・空気絞り弁、（１７）・・・燃料供給弁、（１
８）・・別個構造の掃気孔、Ａ％Ｂ％Ｏ２・・・、Ｙ、
Ｚは掃気孔を分割構造とした小掃気孔であってＡ、Ｂ、
Ｏｌ・・・は混合気供給用不帰気孔、・・・、Ｙ、Ｚは
空気供給用不帰気孔である。
Ｊ １
図 ２1 and 2 show longitudinal side views of embodiments of the invention.
FIG. 6 shows an example of construction Ii# of the present invention in which a scavenging hole divided into small scavenging holes is made separately from the cylinder. In the figure, (1)...Cylinder, (2)...Combustion chamber, (5)...Piston, (4)...Crankcase, (5)...Spark plug, (6)... ...Scavenging hole divided into small scavenging holes, (7>...exhaust hole, (8)...
Mixture scavenging passage, (9)...Mixture scavenging passage entrance, (
10)... Crank chamber, (11)... Sub-scavenging passage,
(12)...Intake hole, (15)...Check valve, (14)
)...Mixer, (15)...Mixture throttle valve, (16
)...Air throttle valve, (17)...Fuel supply valve, (1
8) Separately structured scavenging holes, A%B%O2..., Y,
Z is a small scavenging hole with a divided structure, and A, B,
. . , Y and Z are air supply holes. J 1 Figure 2
Claims (3)
有し、シリンダ中心線と排気孔中心とを含む面（以下シ
リンダの対称面と称する）に対して左右対称に配置され
た掃気孔を隔壁によって各々複数の左右対称な小掃気孔
に分割形成し、これらの小掃気孔のうち排気孔に最も遠
い位置にあるものをＡとし、順次排気孔側にす、ｏ、−
−−１ｙ、ｚとしたとき、ＡｌＢ、Ｏｌ・・・の排気孔
より遠い位１ａの小掃気孔に燃料と空気との予混合気を
供給し、排気孔に近いＹ、Ｚなどの小掃気孔に空気を供
給することを特徴とする層状掃気２サイクル機関。(1) The scavenging holes have a scavenging hole and an exhaust hole that open in the cylinder side wall, and are arranged symmetrically with respect to a plane containing the cylinder centerline and the center of the exhaust hole (hereinafter referred to as the symmetry plane of the cylinder). Each of the small scavenging holes is divided into a plurality of symmetrical small scavenging holes by a partition wall, and among these small scavenging holes, the one located farthest from the exhaust hole is designated as A, and is sequentially moved toward the exhaust hole side.
--When 1y and z, a premixture of fuel and air is supplied to the small scavenging hole 1a far from the exhaust holes of AlB, Ol..., and small scavenging holes of Y, Z, etc. near the exhaust hole are supplied. A stratified scavenging two-stroke engine characterized by supplying air to the pores.
小掃気孔Ａに他の小掃気孔よりも燃料の濃い混合気を供
給することを特徴とする層状掃気２サイクル機関。(2) In 9. Scope of claims for revision (1) of the preceding paragraph,
A stratified scavenging two-stroke engine characterized in that a fuel-rich mixture is supplied to a small scavenging hole A than to other small scavenging holes.
おいて、シリンダの反υト気孔側にさらに掃気孔を有す
る２サイクル機関。(3) The two-stroke engine according to claims (1) and (2) above, further comprising a scavenging hole on the opposite side of the cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4653283A JPS59170423A (en) | 1983-03-18 | 1983-03-18 | Laminar scavenging 2-cycle engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4653283A JPS59170423A (en) | 1983-03-18 | 1983-03-18 | Laminar scavenging 2-cycle engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59170423A true JPS59170423A (en) | 1984-09-26 |
Family
ID=12749893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4653283A Pending JPS59170423A (en) | 1983-03-18 | 1983-03-18 | Laminar scavenging 2-cycle engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59170423A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2622633A1 (en) * | 1987-01-14 | 1989-05-05 | Thery Georges | Combustion chamber of a reciprocating 2-stroke engine and engine applying it |
| US4899698A (en) * | 1987-10-30 | 1990-02-13 | Georges Thery | Combustion chamber for two-stroke reciprocating engine, and and engine making use thereof |
| US5307792A (en) * | 1991-04-22 | 1994-05-03 | Sanshin Kogyo Kabushiki Kaisha | Two cycle engine provided with a scavenging pump |
| WO1998017901A1 (en) * | 1996-10-17 | 1998-04-30 | Komatsu Zenoah Co. | Stratified scavenging two-cycle engine |
| EP1176296A1 (en) * | 1999-04-23 | 2002-01-30 | Komatsu Zenoah Co. | Stratified scavenging two-stroke cycle engine |
| EP2557293A2 (en) | 2011-08-10 | 2013-02-13 | Yamabiko Corporation | Two-stroke internal combustion engine |
| EP2749749A1 (en) * | 2012-12-28 | 2014-07-02 | Makita Corporation | Stratified scavenging two-stroke engine |
-
1983
- 1983-03-18 JP JP4653283A patent/JPS59170423A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2622633A1 (en) * | 1987-01-14 | 1989-05-05 | Thery Georges | Combustion chamber of a reciprocating 2-stroke engine and engine applying it |
| US4899698A (en) * | 1987-10-30 | 1990-02-13 | Georges Thery | Combustion chamber for two-stroke reciprocating engine, and and engine making use thereof |
| US5307792A (en) * | 1991-04-22 | 1994-05-03 | Sanshin Kogyo Kabushiki Kaisha | Two cycle engine provided with a scavenging pump |
| WO1998017901A1 (en) * | 1996-10-17 | 1998-04-30 | Komatsu Zenoah Co. | Stratified scavenging two-cycle engine |
| EP1176296A1 (en) * | 1999-04-23 | 2002-01-30 | Komatsu Zenoah Co. | Stratified scavenging two-stroke cycle engine |
| EP1176296A4 (en) * | 1999-04-23 | 2008-06-25 | Husqvarna Zenoah Co Ltd | Stratified scavenging two-stroke cycle engine |
| EP2557293A2 (en) | 2011-08-10 | 2013-02-13 | Yamabiko Corporation | Two-stroke internal combustion engine |
| US8967100B2 (en) | 2011-08-10 | 2015-03-03 | Yamabiko Corporation | Two-stroke internal combustion engine |
| EP2749749A1 (en) * | 2012-12-28 | 2014-07-02 | Makita Corporation | Stratified scavenging two-stroke engine |
| CN103912362A (en) * | 2012-12-28 | 2014-07-09 | 株式会社牧田 | Stratified scavenging two-stroke engine |
| CN103912362B (en) * | 2012-12-28 | 2016-04-13 | 株式会社牧田 | Stratified scavenging two-stoke cycle engine |
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