JPS60150421A - Scavenging port of two-cycle internal-combustion engine - Google Patents
Scavenging port of two-cycle internal-combustion engineInfo
- Publication number
- JPS60150421A JPS60150421A JP685584A JP685584A JPS60150421A JP S60150421 A JPS60150421 A JP S60150421A JP 685584 A JP685584 A JP 685584A JP 685584 A JP685584 A JP 685584A JP S60150421 A JPS60150421 A JP S60150421A
- Authority
- JP
- Japan
- Prior art keywords
- scavenging
- hole
- edge
- outlet
- scavenging 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.)
- 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
- 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)
- Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
Abstract
Description
【発明の詳細な説明】
本発明はシュニューレ掃気２サイクル内燃機関の掃気孔
形状に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a scavenging hole shape for a Schnuler scavenged two-stroke internal combustion engine.
２サイクル内燃機関の新気のシリンダ外への吹き抜は損
失を低減するため多くの提案がなされている。発明者ら
は、掃気孔の適切な決定のみにより吹き抜は損失を大巾
に低減し得ることを見い出している（特願昭５８−１１
１５２３号：発明の名称・・・２サイクル内燃機関の掃
気孔および２サイクル内添機関、特許出願昭和５８年１
２月３０日 順番未着：発明の名称・・・２サイクル内
燃機関の掃気孔）が、本発明も同様のものである。Many proposals have been made for blowing fresh air out of the cylinders of two-stroke internal combustion engines to reduce losses. The inventors have discovered that the loss of the atrium can be greatly reduced only by appropriately determining the scavenging holes (Japanese Patent Application No. 58-11).
No. 1523: Title of the invention: Scavenging hole for 2-stroke internal combustion engine and 2-stroke internal combustion engine, patent application filed in 1982
February 30th: Not yet received: title of the invention (scavenging hole for a two-stroke internal combustion engine), but the present invention is also the same.
本発明は、機関の複雑化やコストの上昇を招くことなく
、掃気孔の形状のみにより新気の吹き抜は損失を低減す
ることによって燃料消％ＪＩＭｋの低減と排気の浄化と
を図ることを目的とする０以下図面により発明の適用例
について詳細に説明する。The present invention aims to reduce fuel consumption % JIMk and purify exhaust gas by reducing the loss of fresh air by only using the shape of the scavenging hole, without complicating the engine or increasing costs. Application examples of the invention will be described in detail with reference to the drawings.
図１はシュニューレ掃気２サイクル内燃機関のシリンダ
軸に垂直な力「面図で、掃気化下縁に近い部分の掃気孔
形状を示す。Figure 1 is a side view of the force perpendicular to the cylinder axis of a Schnurre scavenging two-stroke internal combustion engine, showing the shape of the scavenging hole near the lower edge of the scavenging engine.
図２は、図１においてＰ方向から見た掃気孔出口形状を
示し、図３は掃気孔形状の立体図である。FIG. 2 shows the shape of the scavenging hole exit as seen from the direction P in FIG. 1, and FIG. 3 is a three-dimensional view of the shape of the scavenging hole.
本適用例においては、掃気化出口下縁（９）と掃気化出
口の排気孔側縁（８）とを滑らかな円弧状曲線で連結し
て円弧状縁（１０）となし、掃気孔側の壁面に該円弧状
縁（１０）に沿って四部（１２）を形成している。In this application example, the lower edge (9) of the scavenging outlet and the exhaust hole side edge (8) of the scavenging outlet are connected by a smooth arc-shaped curve to form an arc-shaped edge (10), Four parts (12) are formed on the wall surface along the arcuate edge (10).
また、掃気孔（！Ｓ）を形成する圧排気孔側壁（５）の
掃気化出口下縁（９）に近い部分を（１３）のように凸
状に形成し、掃気化出口下縁（９）と掃気化出口の圧排
気孔側縁（力との接続部（１１）を、該掃気孔を形成す
る圧排気孔側壁（５）に対し圧排気孔方向に突出させて
いる。In addition, the part of the pressure exhaust hole side wall (5) forming the scavenging hole (!S) near the scavenging outlet lower edge (9) is formed into a convex shape as shown in (13), and the scavenging outlet lower edge (9) The pressure exhaust hole side edge (connection portion (11) with the pressure exhaust hole) of the scavenging outlet is made to protrude toward the pressure exhaust hole with respect to the pressure exhaust hole side wall (5) forming the scavenging hole.
本発明を適用しない通常の掃気孔形状の場合、クランク
室より掃気通路を経て圧送された掃気はその慣性のため
掃気主流は掃気孔上部壁（１５）寄りを流れる。In the case of a normal scavenging hole shape to which the present invention is not applied, the main flow of scavenging air forced into the scavenging air passage from the crank chamber flows near the upper wall (15) of the scavenging hole due to its inertia.
掃気主流は掃気孔からシリンダ内に流入するに際し、流
速も速く、運動量も相対的に大きいのでコントロールし
易い。逆に、掃気孔上部壁（１６）付近を経てシリンダ
内に流入する掃気流は流速が遅いため排気慣性等により
排気孔方向に短絡し易い。When the main flow of scavenging air flows into the cylinder from the scavenging hole, the flow velocity is fast and the momentum is relatively large, so it is easy to control. On the other hand, the scavenging air flowing into the cylinder through the vicinity of the upper wall (16) of the scavenging hole has a slow flow velocity, so it is likely to be short-circuited toward the exhaust hole due to exhaust inertia or the like.
本発明によれば、このような掃気孔下部壁付近を流れる
掃気を円弧状ｔ＆（１０）により矢印（１４）のように
圧排気孔側に強く方向づけることができ、排気孔への短
絡を防ぐことができる。円弧状縁（１０）の効果に加え
て、掃気孔を形成する圧排気孔側４？！（５）の掃気化
出口下縁に近い部分を凸状（１３）に形成し、掃気化出
口下縁（９）を圧排気孔側に突出させた場合、掃気流の
方向コントロールは一層確実となる。According to the present invention, the scavenging air flowing near the lower wall of the scavenging hole can be strongly directed toward the pressure exhaust hole as shown by the arrow (14) by the circular arc t&(10), thereby preventing short circuits to the exhaust hole. Can be done. In addition to the effect of the arcuate edge (10), the pressure exhaust hole side 4? forms a scavenging hole. ! If the part near the lower edge of the scavenging outlet in (5) is formed into a convex shape (13) and the lower edge (9) of the scavenging outlet protrudes toward the pressure exhaust hole, the direction control of the scavenging air flow will be more reliable. .
以上の如く、本発明によれば機関の構造を複雑にせず、
また製造コストも従来と全く変わることなく新気のシリ
ンダ外への流出を防ぎ、燃料消費量低減と排気中未燃炭
化水素分の低減とを図ることができる。As described above, according to the present invention, the structure of the engine is not complicated,
In addition, the manufacturing cost remains the same as in the past, and it is possible to prevent fresh air from flowing out of the cylinder, thereby reducing fuel consumption and unburned hydrocarbon content in the exhaust gas.
図１、図２、図３は本発明を適用したシュニューレ掃気
２サイクル内燃機関の掃気孔形状を示す図である。これ
らの図において、（１）・・・シリンダ、（２〕・・・
排気孔、（勺・・・掃気孔、（４）・・・掃気孔を形成
する排気孔側の壁、（５）・・・掃気孔を形成する圧排
気孔側の壁、（６）・・・掃気孔出口上総、（７）・・
・掃気化出口の圧排気孔側縁、（８）・・・掃気化出口
の排気孔側縁、（９）・・・掃気化出口下縁、（１０）
−・・掃気化出口の円弧状縁、（１１）・・・掃気化出
口下縁と掃気化出口の圧排気孔側縁との接続部、（１２
）−・・円弧状縁に沿って掃気孔に、形成された凹部、
（１３）・・・掃気孔を形成する圧排気孔側壁の凸部、
（１４）・・・掃気流、（１５）・・・掃気孔上部壁、
（１６）・・・掃気孔上部壁である。FIGS. 1, 2, and 3 are diagrams showing the shape of scavenging holes in a Schnuler scavenging two-stroke internal combustion engine to which the present invention is applied. In these figures, (1)...Cylinder, (2]...
Exhaust hole, (勺...Scavenging hole, (4)...Wall on the exhaust hole side forming the scavenging hole, (5)...Wall on the pressure exhaust hole side forming the scavenging hole, (6)...・Scavenging hole outlet Kazusa, (7)...
- Pressure exhaust hole side edge of scavenging outlet, (8)...Exhaust hole side edge of scavenging outlet, (9)...Lower edge of scavenging outlet, (10)
-... Arc-shaped edge of the scavenging outlet, (11)... Connection portion between the lower edge of the scavenging outlet and the pressure exhaust hole side edge of the scavenging outlet, (12)
) - ... a recess formed in the scavenging hole along the arcuate edge,
(13)...Convex portion on the side wall of the pressure exhaust hole forming the scavenging hole,
(14)...Scavenging air flow, (15)...Scavenging hole upper wall,
(16)...This is the upper wall of the scavenging hole.
Claims (4)
閉される掃気孔を有するシュニューレ掃気２サイクル内
燃機関において、掃気化出口のクランクケース側縁（以
下「掃気化出口下縁」と呼ぶ）と、掃気化出口の排気孔
側縁とを滑らかな円弧状曲線で連結して円弧状縁となし
、掃気孔側の壁面を該円弧状縁に沿って凹状に形成した
ことを特徴とする掃気孔形状。(1) In a Schnürer scavenging two-stroke internal combustion engine that has a scavenging hole that opens in the cylinder side wall and is opened and closed by the side surface of the piston, the side edge of the crankcase of the scavenging outlet (hereinafter referred to as the "scavenging outlet lower edge") and the scavenging air A scavenging hole shape characterized in that the side edge of the exhaust hole of the conversion outlet is connected with a smooth arc-shaped curve to form an arcuate edge, and the wall surface on the side of the scavenging hole is formed in a concave shape along the arcuate edge.
掃気孔を形成する反排気孔側壁の掃気化下縁に近い部分
を凸状に形成し、掃気孔出［Ｊ下縁と掃気化出口の反排
気孔側縁との接続部を、該掃気孔を形成する反排気孔側
壁に対し反排気孔方向に突出させたことを特徴とする掃
気孔形状。(2) In a Schnurre scavenged two-cycle internal combustion engine,
The part of the side wall opposite to the scavenging hole that forms the scavenging hole is formed into a convex shape, and the connection part between the lower edge of the scavenging hole and the side edge of the scavenging outlet opposite to the scavenging hole is formed into a convex shape. A scavenging hole shape characterized by protruding in a direction opposite to the exhaust hole with respect to a side wall opposite to the exhaust hole.
み合わせた掃気孔形状。(3) A scavenging hole shape that combines claims (1) and (2).
て、掃気孔を分割して複数の対の小掃気孔を形成し、こ
れら小掃気孔の一部又は全部を各々前記「特許請求の範
囲」（１）又は（２）又は（ロ）と同様にしたことを特
徴とする掃気孔形状。(4) In a Schnurre "scavenging two-stroke internal combustion engine, a scavenging hole is divided to form a plurality of pairs of small scavenging holes, and a part or all of these small scavenging holes are each set according to the above-mentioned Claim (1). Or a scavenging hole shape characterized by having the same shape as (2) or (b).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP685584A JPS60150421A (en) | 1984-01-18 | 1984-01-18 | Scavenging port of two-cycle internal-combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP685584A JPS60150421A (en) | 1984-01-18 | 1984-01-18 | Scavenging port of two-cycle internal-combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60150421A true JPS60150421A (en) | 1985-08-08 |
Family
ID=11649840
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP685584A Pending JPS60150421A (en) | 1984-01-18 | 1984-01-18 | Scavenging port of two-cycle internal-combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60150421A (en) |
-
1984
- 1984-01-18 JP JP685584A patent/JPS60150421A/en active Pending
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