JPS59173518A - Two-cycle internal-combustion engine with layers of scavenging air - Google Patents
Two-cycle internal-combustion engine with layers of scavenging airInfo
- Publication number
- JPS59173518A JPS59173518A JP4841183A JP4841183A JPS59173518A JP S59173518 A JPS59173518 A JP S59173518A JP 4841183 A JP4841183 A JP 4841183A JP 4841183 A JP4841183 A JP 4841183A JP S59173518 A JPS59173518 A JP S59173518A
- Authority
- JP
- Japan
- Prior art keywords
- scavenging
- scavenging air
- cylinder
- air flow
- boat
- 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
- F02B25/14—Engines characterised by using fresh charge for scavenging cylinders using reverse-flow scavenging, e.g. with both outlet and inlet ports arranged near bottom of piston stroke
-
- 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)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
Description
【発明の詳細な説明】 本発明は層状掃気二サイクル内燃機関に関する。[Detailed description of the invention] The present invention relates to a stratified scavenged two-stroke internal combustion engine.
ニサイクル内燃機関において新気の吹き抜けを減らし熱
効率を著しく改善するためには、シリンダ内新気と残留
ガスの混合をできるだけ防ぎ、層状的に燃焼ガスを排出
して新気をシリンダ内に捕捉する層状掃気の実現が不可
避である。In order to reduce blow-through of fresh air and significantly improve thermal efficiency in a two-cycle internal combustion engine, it is necessary to prevent the mixing of fresh air and residual gas in the cylinder as much as possible, exhaust combustion gas in a stratified manner, and trap fresh air in the cylinder. The realization of scavenging is inevitable.
掃気流の運動量が大きければ新気の先端吹き抜けが多く
、又残留ガスとの混合がよく行われ、混合ガスとして排
出される。従って層状掃気の実現のためには掃気流のも
つ運動量をシリンダ内に於いて減衰し、新気塊を排気孔
から離れた位置に分布さ、せる必要がある。If the momentum of the scavenging flow is large, a large amount of fresh air blows through at the tip, and the fresh air is mixed well with the residual gas and is discharged as a mixed gas. Therefore, in order to realize stratified scavenging, it is necessary to attenuate the momentum of the scavenging air flow within the cylinder and distribute the fresh air mass away from the exhaust hole.
本発明は掃気流相互間の衝突と、掃気流と壁との衝突を
利用して掃気のもつ運動量を効果的に減衰して層状掃気
を達成し、もって熱効率が優れ、排気ガスのより清浄な
内燃機関を提供することを目的とする。The present invention effectively attenuates the momentum of the scavenging air by utilizing collisions between the scavenging air flows and collisions between the scavenging air flows and the wall to achieve stratified scavenging, thereby achieving excellent thermal efficiency and purifying the exhaust gas. The purpose is to provide internal combustion engines.
本発明の特徴は、シリンダ軸に対し排気孔と反対側のシ
リンダ内壁部に、掃気流を衝突・減衰さすための掃気流
減衰室を設け、又は主掃気に対向的に衝突して掃気の運
動量を減衰さすための掃気流減衰用副掃気ボートを設け
たことにある0以下図面により本発明の詳細な説明する
。A feature of the present invention is that a scavenging air flow attenuation chamber for colliding and attenuating the scavenging air flow is provided on the inner wall of the cylinder on the opposite side of the exhaust hole with respect to the cylinder axis, or the momentum of the scavenging air is The present invention will be described in detail with reference to the drawings below.
図1は掃気流減衰室を持つクランク室圧綿シュニューレ
掃気式空冷二サイクル内燃機関のシリンダ軸を含む断面
図であり、図2は図1の機関に於いて、掃気流減衰室の
作用を示すためのシリンダ半径方向の断面図である。Fig. 1 is a sectional view including the cylinder axis of a crank chamber compressed cotton schnula scavenged air-cooled two-stroke internal combustion engine having a scavenging air flow damping chamber, and Fig. 2 shows the action of the scavenging air flow damping chamber in the engine of Fig. 1. FIG.
図1、図2において、シリンダ(1)の中心軸に対し、
排気孔(14)の反対側のシリンダ内壁に掃気流減衰室
(18)を設け、掃気ボートはシリンダ中心を排気孔中
心とを結ぶ線に対して対称の位置にあり、掃気流の制御
のための隔壁(i5) 、(16)により対の掃気ボー
トを(17)と(18)及び(19)と(2のとにそれ
ぞれ分割しである。In FIGS. 1 and 2, with respect to the central axis of the cylinder (1),
A scavenging airflow damping chamber (18) is provided on the inner wall of the cylinder opposite to the exhaust hole (14), and the scavenging boat is located symmetrically with respect to a line connecting the center of the cylinder and the center of the exhaust hole, and is used to control the scavenging airflow. The partition walls (i5) and (16) divide the pair of scavenging boats into (17) and (18) and (19) and (2), respectively.
さて、ピストン上昇時混合気絞り弁(12)及び吸気管
(11)を通ってクランク室(8)内に流入した空気/
燃料の混合気はピストン(4)の下降により圧縮され、
掃気ケートが開孔すると掃気流がシリンダ内に流入する
。隔壁付き掃気ボートにより方向制御された掃気流の内
、掃気ボー、) (17)、(19)から出る掃気は図
2のように互に衝突すると同時に掃気流減衰室(18)
内の壁に衝突し、しかも拡散を妨げられる。Now, when the piston rises, air flows into the crank chamber (8) through the mixture throttle valve (12) and the intake pipe (11).
The fuel mixture is compressed by the descent of the piston (4),
When the scavenging cage is opened, the scavenging air flow flows into the cylinder. Among the scavenging airflows whose directions are controlled by the scavenging boats with bulkheads, the scavenging air coming out of the scavenging boats (17) and (19) collides with each other as shown in Figure 2, and at the same time, the scavenging air flows into the scavenging air flow damping chamber (18).
It collides with the inner wall and is prevented from spreading.
一方シリンダ上方に方向制御された掃気ボー) (27
)、(20)からの掃気は互に衝突しながら燃焼ガスを
排気孔(14)に押し出す。かくしてシリンダ中心軸に
対し、排気孔の及対方向のシリンダ内空間に新気がよく
分布し、排気孔側に燃焼ガスが分布することになる。On the other hand, the direction of scavenging air is controlled upwards in the cylinder) (27
), (20) collide with each other and push out the combustion gas to the exhaust hole (14). In this way, fresh air is well distributed in the cylinder interior space in the direction opposite to the exhaust hole with respect to the cylinder center axis, and combustion gas is distributed on the exhaust hole side.
図1の内燃機関において、通常のピストン(4)の代り
に段差のついたクラウンを有するピストンを用いた場合
の発明例を示すのが図3・図4である。3 and 4 show an example of the invention in which a piston having a stepped crown is used in place of the normal piston (4) in the internal combustion engine of FIG. 1.
図5はシリンダ軸を含む断面図、図4はシリンダ半径方
向断面図である。両図に於いてピストン・クラウン(1
3)は掃気ボートの排気側の壁付近に接する部分より排
気側を高くシ、シかも段差&ま急なものとなっている。FIG. 5 is a cross-sectional view including the cylinder axis, and FIG. 4 is a cross-sectional view in the cylinder radial direction. In both figures, the piston crown (1
3) The exhaust side is higher than the part that touches the wall on the exhaust side of the scavenging boat, and it is also stepped and steep.
この段差により、掃気ボート(27)及び(20)から
流出する掃気流は一層よく方向制御され、また掃気流減
衰室付近の新気の拡散も防がれる。このようなピストン
形状により掃気の層状化はさらに促進される。This step provides better directional control of the scavenging air flow exiting from the scavenging boats (27) and (20), and also prevents fresh air from dispersing near the scavenging air flow attenuation chamber. Such a piston shape further promotes stratification of scavenging air.
図5は、シリンダ中心軸に対し、排気孔と反対側に、掃
気の流出方向がピストン往復方向に対し直角又はそれに
近い方向となるような掃・気流減衰用副掃気ボー)(2
1)を設けたクランク室圧綿シュニューレ掃気式空冷二
サイクル内燃機関の例を示す図である。Figure 5 shows a sub-scavenging air bow (for scavenging and airflow damping) (2
1) is a diagram showing an example of a crank chamber pressure cotton schnule scavenging type air-cooled two-stroke internal combustion engine.
図5に於いて、ピストン下降と共に副掃気ボー) (2
1)が開孔するとクランク室に連通ずる副掃気通路(2
2)を通って新気がシリンダ内に流入する。In Fig. 5, as the piston descends, the sub-scavenging air bow) (2
When 1) is opened, an auxiliary scavenging passage (2) that communicates with the crank chamber is opened.
Fresh air flows into the cylinder through 2).
副掃気ボー)(21)と略々同時期に開孔する対の主掃
気ボー) (2!l)が開くと副掃気ボート方向に方向
制御された掃気がシリンダ内に流入し、岳l掃気ボ−ト
からの掃気と対向的に衝突する。対向的に勘突、減衰し
た新気は排気孔の反対側のシリンダ空間に分布する。対
の掃気ボー)(24)からシリンダ内に流入した掃気は
互に衝突し速度を減じながら燃焼ガスを排気孔(26)
に押し出す。When the pair of main scavenging bows (2!l) are opened at approximately the same time as the sub-scavenging bows) (21), scavenging air whose direction is controlled in the direction of the sub-scavenging boats flows into the cylinder, and the scavenging air flows into the cylinder. It collides with the scavenging air from the boat. The new air collides oppositely and is attenuated, and is distributed in the cylinder space on the opposite side of the exhaust hole. The scavenging air that flows into the cylinder from the pair of scavenging holes (24) collides with each other and reduces the speed while sending the combustion gas to the exhaust hole (26).
push it out.
このように図5の例に於いても排気孔から最も離れたシ
リンダ内空間部分に新気濃度の高いガスが分布し、排気
孔に近い空間部分には燃焼ガスの濃度の高いガスが分布
することにより、新気の吹き抜けが減る。In this way, in the example of Fig. 5 as well, gas with a high concentration of fresh air is distributed in the space within the cylinder farthest from the exhaust hole, and gas with a high concentration of combustion gas is distributed in the space near the exhaust hole. This reduces the amount of fresh air blowing through.
なお、従来のニサイクルエンジンに於いても排気孔の反
対側のシリンダ壁に副掃気ボートを設け、出力増大を図
ったものがあるが、この場合には副掃気ボートからの掃
気流出方向が排気孔側或いは排気孔上方に向いており、
しかも主・副面掃気の方向制御が精密でないため、新気
の吹き抜けが増加する場合が多い。従って、図5の発明
例は従来の掃気方式とは全く異なるものである。In addition, some conventional two-cycle engines have a sub-scavenging boat installed on the cylinder wall opposite the exhaust hole to increase output, but in this case, the scavenging air outflow direction from the sub-scavenging boat is the exhaust direction. facing the hole side or above the exhaust hole,
Moreover, since the direction control of the main and subsurface scavenging air is not precise, blow-by of fresh air often increases. Therefore, the invention example shown in FIG. 5 is completely different from the conventional scavenging system.
図5の発明例の場合にも、図3、図4に示した段差のつ
いたクラウンを有するピストンを用いる時、層状効果は
一層大きくなる。In the case of the invention example shown in FIG. 5 as well, when a piston having a stepped crown shown in FIGS. 3 and 4 is used, the layered effect becomes even greater.
以上の発明例に於いて、掃気相互、或l/1&ま掃気と
壁との衝突に於いて掃気流の精密なfii(制御力(不
可欠であり、このために対の掃気ボートを複数個にし、
或いは、掃気流制御用の隔壁をJ[’でしする。In the above invention example, precise fii (control force (control force) of the scavenging air flow is essential when the scavenging air collides with each other, or between the scavenging air and the wall, and for this purpose, a plurality of paired scavenging boats are used. ,
Alternatively, the partition wall for controlling the scavenging air flow may be J['.
このような形状の主掃気ボートに掃気流減衰室又は掃気
流減衰用副掃気ボートを組み合わせた時In状掃気を達
成し、もって機関熱効率の改善とIt’気中未燃燃料成
分の低減を図ること力(できる。When a main scavenging boat with such a shape is combined with a scavenging air flow attenuation chamber or a sub-scavenging air boat for scavenging air flow attenuation, in-shape scavenging is achieved, thereby improving engine thermal efficiency and reducing unburned fuel components in the air. koto power (able to do)
図1は掃気流減衰室を持つクランク室圧縮シュニューレ
掃気式空冷二サイクル機関のシ1ノンダ軸を含む断面図
であり、図2は図1の機関に於し)て掃気流減衰室の作
用を示す図である。
図1、図2に於いて、(1)・・・シリンダ゛、(2)
・・・シIJンダヘッド、(3)・・・シリンダ内空間
、(4)・・・ピストン、(5)・・・燃焼室、(6)
・・・点火プラグ、(7)−・・クランクケース、(8
)・・・クランク室、(9)・・・クランクウェブ、(
10)・・・コンロッド、(11)・・・吸気管、(1
2)・・・混合気絞す弁、(14)・・・排気孔、(1
5)、(16)・・・掃気ボート隔壁、(17)、(1
9)、(20)、(27)・・・掃気ボート、(18)
・・・掃気流減衰室、図5、図4は図1の内燃機関に於
いて段差のついたクラウンを有するピストンを用いた場
合の例で、(13)・・・段差のついたクラウンを有す
るピストン、図5は掃気流減衰用副掃気ボートを設けた
クラウン室圧縮シュニューレ掃気式空冷二サイクル機関
の掃気の挙動を示す図で、(21)・・・掃気流減衰用
副掃気ボー)、(22)・・・副掃気通路、(23)、
(24) ・・・主掃気ボー) 、(25)・・・主掃
気ボート隔壁、(26)・・・排気孔。
9Fig. 1 is a sectional view including the cylinder axis of a crank chamber compression schnular scavenging air-cooled two-stroke engine with a scavenging airflow damping chamber, and Fig. 2 shows the action of the scavenging airflow damping chamber in the engine shown in Fig. 1. FIG. In Figures 1 and 2, (1)...Cylinder, (2)
... Cylinder IJ cylinder head, (3) ... Cylinder internal space, (4) ... Piston, (5) ... Combustion chamber, (6)
...Spark plug, (7)--Crankcase, (8
)...Crank chamber, (9)...Crank web, (
10)...Connecting rod, (11)...Intake pipe, (1
2)...Air mixture throttle valve, (14)...Exhaust hole, (1
5), (16)...Scavenging boat bulkhead, (17), (1
9), (20), (27)...Scavenging boat, (18)
...Scavenging air flow damping chamber, Figs. 5 and 4 are examples of the case where a piston with a stepped crown is used in the internal combustion engine of Fig. 1. FIG. 5 is a diagram showing the scavenging behavior of a crown chamber compression schnula scavenging air-cooled two-stroke engine equipped with a sub-scavenging boat for attenuating the scavenging air flow. (22)... Sub-scavenging passage, (23),
(24) Main scavenging boat bulkhead, (25) Main scavenging boat bulkhead, (26) Exhaust hole. 9
Claims (1)
ンダ内壁に小室(以下「掃気流減衰室」と呼ぶ)を設け
、この掃気流減衰室に掃気流の一部又は全部を衝突さす
ことによって掃気の運動量を減衰し、掃気がシリンダ内
壁から燃焼室壁に沿って排気孔に到達するのを防ぎ、新
気を排気孔から離れたシリンダ内空間に滞留せしめるよ
うにした事を特徴とするニサイクル内燃機関。 (2) シリンダ中心軸に対し、排気孔の反対側に副
掃気ボート(以下「掃気流減衰用副掃気ボート」と呼ぶ
)を有し、該副掃気ボートからの掃気の流出方向をピス
トン往復方向に対し直角又はそれに近い方向とし、副掃
気ボート側に強く方向制御された主掃気流の一部又は全
部と副掃気流とを互に対向的に衝突させることにより掃
気の運動量を減衰し、新気を排気孔から離れたシリンダ
内室間に分布せしめるようにしたニサイクル内燃機関。 (3ン「特許請求の範囲(1)」において、掃気流の一
部又は全部を掃気流減衰室に強く方向制御する形状の対
の掃気ボートにより、新気の排気孔への短絡を防止する
と同時に、対の掃気流の一部又は全部を掃気流減衰室の
内部又はその近辺において衝突させて掃気の運動量を減
衰さすことにより、新気を排気孔から離れたシリンダ内
空間に滞留せしめるようにした反転掃気式二サイクル内
燃機関。 (4)「特許請求の範囲(2)、(3)」において、掃
気流を制御するため掃気ボートを複数個に分割し、又は
掃気流制御のための薄壁を掃気ゲート内部に設けたこと
を特徴とする反転掃気式ニサイクル内燃機関。 (5)「特許請求の範囲(1)〜(4)」において、ピ
ストン・クラウンを、掃気ボートの排気側の壁付近に接
する部分より排気側を高く、掃気流減衰室又は掃気流減
衰用副掃気ボート側を低くシ、その段差を急なものとす
ることにより、掃気流の制御と、新気の掃気流減衰室又
は掃気流減衰用副掃気ボート側への分布を一層確実にし
たニサイクル内燃機関。[Claims] (1) A small chamber (hereinafter referred to as a "scavenging air flow damping chamber") is provided on the inner wall of the cylinder on the opposite side of the exhaust hole with respect to the cylinder center axis, and a part of the scavenging air flow or By colliding all of them, the momentum of the scavenging air is attenuated, preventing the scavenging air from reaching the exhaust hole from the cylinder inner wall along the combustion chamber wall, and allowing fresh air to stay in the cylinder interior space away from the exhaust hole. A two-cycle internal combustion engine with the following characteristics: (2) A sub-scavenging boat (hereinafter referred to as "sub-scavenging boat for scavenging air flow attenuation") is provided on the opposite side of the exhaust hole with respect to the cylinder center axis, and the outflow direction of the scavenging air from the sub-scavenging boat is the reciprocating direction of the piston. By colliding part or all of the main scavenging air flow and the sub-scavenging air flow, which are strongly directionally controlled toward the sub-scavenging boat side, with each other, the momentum of the scavenging air is attenuated and the new scavenging air is generated. A two-cycle internal combustion engine that distributes air between the cylinder chambers away from the exhaust hole. (3) In "Claim (1)," a pair of scavenging boats configured to strongly control the direction of part or all of the scavenging airflow to the scavenging airflow damping chamber prevent short circuits of fresh air to the exhaust hole. At the same time, part or all of the pair of scavenging air flows collide inside or near the scavenging air flow attenuation chamber to attenuate the momentum of the scavenging air, thereby causing fresh air to stay in the cylinder interior space away from the exhaust hole. (4) In "Claims (2) and (3)," the scavenging boat is divided into a plurality of parts to control the scavenging air flow, or a thin A reverse scavenging two-cycle internal combustion engine characterized in that a wall is provided inside the scavenging gate. (5) In "Claims (1) to (4)", the piston crown is provided on the exhaust side wall of the scavenging boat. The scavenging air flow can be controlled and the scavenging air flow of fresh air can be attenuated by making the exhaust side higher than the part that touches the vicinity, and lowering the scavenging air flow attenuation chamber or sub-scavenging boat for scavenging air flow attenuation, and making the steps steeper. A two-cycle internal combustion engine with even more reliable distribution of sub-scavenging air to the chamber or boat side for attenuating the scavenging air flow.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4841183A JPS59173518A (en) | 1983-03-23 | 1983-03-23 | Two-cycle internal-combustion engine with layers of scavenging air |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4841183A JPS59173518A (en) | 1983-03-23 | 1983-03-23 | Two-cycle internal-combustion engine with layers of scavenging air |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS59173518A true JPS59173518A (en) | 1984-10-01 |
Family
ID=12802558
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4841183A Pending JPS59173518A (en) | 1983-03-23 | 1983-03-23 | Two-cycle internal-combustion engine with layers of scavenging air |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS59173518A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6218330U (en) * | 1985-07-19 | 1987-02-03 | ||
JPS6390029U (en) * | 1986-11-30 | 1988-06-11 | ||
US5699761A (en) * | 1996-03-01 | 1997-12-23 | Kioritz Corporation | Two-stroke internal combustion engine |
US8967100B2 (en) | 2011-08-10 | 2015-03-03 | Yamabiko Corporation | Two-stroke internal combustion engine |
-
1983
- 1983-03-23 JP JP4841183A patent/JPS59173518A/en active Pending
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6218330U (en) * | 1985-07-19 | 1987-02-03 | ||
JPH0216034Y2 (en) * | 1985-07-19 | 1990-05-01 | ||
JPS6390029U (en) * | 1986-11-30 | 1988-06-11 | ||
JPH0517386Y2 (en) * | 1986-11-30 | 1993-05-11 | ||
US5699761A (en) * | 1996-03-01 | 1997-12-23 | Kioritz Corporation | Two-stroke internal combustion engine |
US8967100B2 (en) | 2011-08-10 | 2015-03-03 | Yamabiko Corporation | Two-stroke internal combustion engine |
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