JPS61145319A - Scavenging holes in two-cycle engine - Google Patents

Scavenging holes in two-cycle engine

Info

Publication number
JPS61145319A
JPS61145319A JP26585184A JP26585184A JPS61145319A JP S61145319 A JPS61145319 A JP S61145319A JP 26585184 A JP26585184 A JP 26585184A JP 26585184 A JP26585184 A JP 26585184A JP S61145319 A JPS61145319 A JP S61145319A
Authority
JP
Japan
Prior art keywords
scavenging
cylinder
holes
hole
stream
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
Application number
JP26585184A
Other languages
Japanese (ja)
Inventor
Hando Jo
徐　判道
Hiroaki Shimazaki
洋明 島崎
Shakko Jo
徐　錫洪
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NIPPON CLEAN ENGINE RES
Original Assignee
NIPPON CLEAN ENGINE RES
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NIPPON CLEAN ENGINE RES filed Critical NIPPON CLEAN ENGINE RES
Priority to JP26585184A priority Critical patent/JPS61145319A/en
Publication of JPS61145319A publication Critical patent/JPS61145319A/en
Pending legal-status Critical Current

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
    • 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
    • F02B25/16—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 the charge flowing upward essentially along cylinder wall opposite the inlet ports
    • 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)

Abstract

PURPOSE:To facilitate the control of scavenging gas stream to enhance the the scavenging of a two-cycle engine, by retracting partion walls between scavenging holes for forming scavenging stream for hindering scavenging stream direction to the exhaust port of a two-cycle engine, slightly from the slide surface of an engine cylinder. CONSTITUTION:Scavenging holes 4, 5 are arranged symmetrical with the center line connecting between an intake port 10 and an exhaust port 2, the scavenging hole 4 near to the exhaust port 2 being arrange in the direction in which scanvenging gas is hindered from blowing through the exhaust port 2. Therefore, the front edges of partition walls 6 through 8 between scavenging holes 4, 5 are retracted slightly from the slide surface of a cylinder 11 for a piston. As the manner of retraction, the one 7 which is uniformly retracted and the one 8 which is retracted in its upper section alone are there. This retracted parts allow scavenging stream from the scavenging hole 4 to strongly change the direction of scavenging stream from the scavenging hole 5, and the scavenging port area may be substantially increase to enhance the scavenging efficiency of the engine.

Description

【発明の詳細な説明】 本発明は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 two-stroke internal combustion engine.

本発明は掃気を改善し、掃気の排気孔への吹き抜は損失
を低減して２サイクル機関の熱効率の向上と排気の低公
害化を図ることを目的とする。The present invention aims to improve scavenging and reduce loss by blowing the scavenging air into the exhaust hole, thereby improving the thermal efficiency of a two-stroke engine and reducing exhaust pollution.

略々対称に掃気孔を有する２サイクル機関の掃気を改善
するために、隔壁によって複数対の掃気孔を形成するこ
とが広く行なわれている。この場合、隔壁を設けること
は！４気孔出口の断面積を制限して出力低下を招くばか
りか、隔壁自体が掃気流の制御を妨げることがある。本
発明はこのような隔壁のマイナス面を除き、掃気流の制
御が容易な隔壁の形状を示すものである。In order to improve the scavenging of two-stroke engines having substantially symmetrical scavenging holes, it is common practice to form multiple pairs of scavenging holes by partition walls. In this case, there is no need to install a bulkhead! Not only does this limit the cross-sectional area of the four-hole outlet, resulting in a reduction in output, but the partition wall itself may impede control of the scavenging air flow. The present invention eliminates the negative aspects of such a partition wall and provides a partition wall shape that allows easy control of scavenging airflow.

以下図面により発明の実施例を詳述する。Embodiments of the invention will be described in detail below with reference to the drawings.

図１は二対の掃気孔を有する。シュニューレＭ気式２サ
イクＡ／Ｉａ関のシリンダ断面図で、図２は図１のＡ−
Ａ断面により掃気孔間の隔壁の形状を示す図である。図
３、図４は本発明を適用した隔壁の形状の例を示す。FIG. 1 has two pairs of scavenging holes. A cross-sectional view of the Schnurelle M air type 2-cycle A/Ia cylinder.
FIG. 3 is a diagram illustrating the shape of partition walls between scavenging holes in cross section A; 3 and 4 show examples of the shapes of partition walls to which the present invention is applied.

新気の吹き抜は損失を低減するためには、図１に示すよ
うに＃１１気の吹き出し、特に排気孔（２）に近い側の
掃気孔（４）からの掃気１の吹き出しを反排気孔側に強
く方向付けるのが良い。ところが図１、図２に示すよう
に掃気孔間の隔壁（６）を従来の如くシリンダ摺動面（
１２）まで形成した場合、隔壁の掃気孔出口部分に制約
されて掃気１の反排気孔方向への制御が不十分となる。In order to reduce the loss of the fresh air blowout, as shown in Figure 1, the blowout of #11 air, especially the blowout of scavenging air 1 from the scavenging hole (4) on the side closer to the exhaust hole (2), should be It is best to orient it strongly toward the hole side. However, as shown in Figures 1 and 2, the partition wall (6) between the scavenging holes has been replaced with the cylinder sliding surface (6) as in the past.
If it is formed up to 12), the control of the scavenging air 1 in the direction opposite to the exhaust hole will be insufficient due to the restriction of the scavenging hole exit portion of the partition wall.

更に一般に掃気孔出口断面積は出力の制約要因となるの
であるが、図１の如く掃気を反排気孔方向に吹き出さす
場合には−ｍｍ気孔出口断面檀が小さくなる。Furthermore, although the cross-sectional area of the scavenging hole exit is generally a limiting factor for the output, when the scavenging air is blown out in a direction opposite to the exhaust hole as shown in FIG. 1, the -mm hole exit cross-sectional area becomes smaller.

これに対して図３に示すように隔壁をシリンダ摺動面か
ら若干後退して形成した場合には、掃気流を思いきって
反排気孔方向に制御することが可能となり、また掃気孔
出口断面積が小さくなることもないので出力を十分確保
することができるのである。また、掃気主流は掃気孔内
においてはシリンダヘッド寄りを流れるので、図４の如
く隔壁（８）の掃気孔出口部分のうち、シリンダヘッド
寄りの部分のみをシリンダ摺動面より後退させても図３
の隔壁と同様の効果があるＯ 上述の発明例は二対の対称な掃気孔を有する機関につい
てのものであるが、掃気流の制御をより確実に行うため
、例えば二対の隔胤を設けて三対の掃気孔を形成する場
合には、掃気流の方向制御の面でも、また出力確保の点
でも本発明は一層効果的となる＠ 以上の如く、本発明によれば機関の出力を確保しながら
掃気流の制御を十分に行うことが可能となり１以って新
気の吹き抜は損失を低減して２サイクル機関の熱効率と
排気とを改善することができるのである。On the other hand, if the partition wall is formed to be slightly set back from the cylinder sliding surface as shown in Figure 3, it becomes possible to control the scavenging airflow in the direction opposite to the exhaust hole, and the cross-sectional area of the scavenging hole exit Since the output voltage does not become small, sufficient output can be ensured. Furthermore, since the main flow of scavenging air flows closer to the cylinder head within the scavenging hole, it is also possible to move only the portion of the scavenging hole outlet portion of the partition wall (8) that is closer to the cylinder head back from the cylinder sliding surface as shown in Figure 4. 3
The invention example described above concerns an engine having two pairs of symmetrical scavenging holes. When three pairs of scavenging holes are formed, the present invention becomes even more effective in terms of controlling the direction of the scavenging air flow and ensuring output.As described above, according to the present invention, the output of the engine can be It becomes possible to sufficiently control the scavenging air flow while ensuring the flow of fresh air, thereby reducing the loss of fresh air and improving the thermal efficiency and exhaust of the two-stroke engine.

【図面の簡単な説明】[Brief explanation of drawings]

図１はシュニューレ掃気式２サイクル機関のシリンダ断
面図で、図２は図１の機関の掃気孔間の隔壁を示し、図
３、図４は本発明を適用した隔壁の例を示す。これらの
図において、（１）・・・シリンダ、（２）・・・排気
孔、（３）　・・・シリンダ対称面、（４）、（５）・
・・掃気孔、（６）、（力、（印・・・掃気孔間の隔壁
、（９ン・・・掃気孔を形成するシリンダヘッド側の壁
、（１０）−・・吸気孔、（１１）−・・シリンダ空間
、（１２）・・シリンダ摺動面、１・・・掃気流である
。FIG. 1 is a sectional view of a cylinder of a Schnurre scavenging two-stroke engine, FIG. 2 shows a partition wall between scavenging holes of the engine of FIG. 1, and FIGS. 3 and 4 show examples of partition walls to which the present invention is applied. In these figures, (1)...Cylinder, (2)...Exhaust hole, (3)...Cylinder symmetry plane, (4), (5)...
... Scavenging hole, (6), (force, (mark)... Partition wall between scavenging holes, (9)... Wall on the cylinder head side forming the scavenging hole, (10) -... Intake hole, ( 11) - Cylinder space, (12) Cylinder sliding surface, 1... Scavenging air flow.

Claims (2)

【特許請求の範囲】[Claims] （１）シリンダ側壁に形成された排気孔の中心とシリン
ダ中心軸とを含む面（以後「シリンダ対称面」と称す）
に対して略々対称に形成され、ピストンの往復運動によ
り開閉される複数対の掃気孔をシリンダ側壁に有する２
サイクル内燃機関に於いて、掃気孔間の隔壁の一部又は
全部をシリンダ摺動面からわずかに後退させて形成した
ことを特徴とする掃気孔形状。(1) A plane that includes the center of the exhaust hole formed in the cylinder side wall and the cylinder central axis (hereinafter referred to as the "cylinder symmetry plane")
The cylinder side wall has a plurality of pairs of scavenging holes that are formed approximately symmetrically with respect to each other and are opened and closed by the reciprocating movement of the piston.
1. A scavenging hole shape in a cycle internal combustion engine, characterized in that part or all of the partition between the scavenging holes is slightly set back from a cylinder sliding surface. （２）シリンダ対称面に対して略々対称に形成され、ピ
ストンの往復運動により開閉される複数対の掃気孔をシ
リンダ側壁に有する２サイクル内燃機関に於いて、掃気
孔間の隔壁の一部分をシリンダ摺動面から後退させたこ
とを特徴とする掃気孔形状。(2) In a two-stroke internal combustion engine that has multiple pairs of scavenging holes in the cylinder side wall that are formed approximately symmetrically with respect to the cylinder symmetry plane and that are opened and closed by the reciprocating movement of the piston, a portion of the partition wall between the scavenging holes is The scavenging hole shape is characterized by being set back from the cylinder sliding surface.
JP26585184A 1984-12-17 1984-12-17 Scavenging holes in two-cycle engine Pending JPS61145319A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP26585184A JPS61145319A (en) 1984-12-17 1984-12-17 Scavenging holes in two-cycle engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP26585184A JPS61145319A (en) 1984-12-17 1984-12-17 Scavenging holes in two-cycle engine

Publications (1)

Publication Number Publication Date
JPS61145319A true JPS61145319A (en) 1986-07-03

Family

ID=17422951

Family Applications (1)

Application Number Title Priority Date Filing Date
JP26585184A Pending JPS61145319A (en) 1984-12-17 1984-12-17 Scavenging holes in two-cycle engine

Country Status (1)

Country Link
JP (1) JPS61145319A (en)

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