JPS6125918A - Schnurle scavenging type two-cycle engine - Google Patents

Schnurle scavenging type two-cycle engine

Info

Publication number
JPS6125918A
JPS6125918A JP14667384A JP14667384A JPS6125918A JP S6125918 A JPS6125918 A JP S6125918A JP 14667384 A JP14667384 A JP 14667384A JP 14667384 A JP14667384 A JP 14667384A JP S6125918 A JPS6125918 A JP S6125918A
Authority
JP
Japan
Prior art keywords
scavenging
exhaust hole
liquid fuel
crank chamber
fuel
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
JP14667384A
Other languages
Japanese (ja)
Inventor
Tokio Kumakawa
熊川　外喜男
Shigeru Onishi
繁 大西
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 JP14667384A priority Critical patent/JPS6125918A/en
Publication of JPS6125918A publication Critical patent/JPS6125918A/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
    • 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
    • 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
    • F02B33/00—Engines characterised by provision of pumps for charging or scavenging
    • F02B33/02—Engines with reciprocating-piston pumps; Engines with crankcase pumps
    • F02B33/04—Engines with reciprocating-piston pumps; Engines with crankcase pumps with simple crankcase pumps, i.e. with the rear face of a non-stepped working piston acting as sole pumping member in co-operation with the crankcase
    • 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
    • F02B33/00—Engines characterised by provision of pumps for charging or scavenging
    • F02B33/44—Passages conducting the charge from the pump to the engine inlet, e.g. reservoirs
    • 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
    • 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
    • F02B61/00—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
    • F02B61/02—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving cycles

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supercharger (AREA)

Abstract

PURPOSE:To reduce the blow-out loss of fuel components, by forming a sump for liquid fuel components in the vicinity of the crank chamber side opening part of a scavenging passage, and by forming a wall defining this sump in such a shape that it is higher at the exhaust hole side than at the side remote from the exhaust hole. CONSTITUTION:A sump 10 for pooling therein liquid fuel is formed in the crank chamber side opening part 9 (scavenging passage inlet) of a scavenging passage 8 communicating three pair of scavenging holes 3 through 5 symmetrically formed in the inner wall surface of an engine cylinder with a crank chamber 12 so that the height of a wall 14 defining the sump 10, from the surface of liquid fuel, is higher at the exhaust hole 2 side than at the side remote from the exhaust hole 2. With this arrangement, liquid fuel on the side remote from the exhaust hole 2 are blown out by means of a scavenging air stream Q while it is atomized, and a substantial part of the fuel is allowed to flow into the engine cylinder 1 through scavenging holes 3, 4 together with the scavenging stream. Thereby the concentration of fuel passing through the scavenging holes 3, 4 is higher than that passing through the scavenging hole 5, thereby it is possible to reduce the blow-out loss of fuel components through the exhaust holes 2.

Description

【発明の詳細な説明】 本発明は火花点火シュニューレ掃気２サイクル内燃機関
の掃気通路形状に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a scavenging passage configuration for a spark ignition schnula scavenging two-stroke internal combustion engine.

小形２サイクルガソリン機関の燃料成分の吹き抜は損失
を低減するため種々の掃気孔形状或いは層状掃気法が考
案されている。本発明はクランク室或いは掃気通路内液
状燃料の挙動に着目し、掃気通路形状の適切な決定のみ
により液状燃料の流れを制御し、以って燃料成分の吹き
抜は損失を低減し得るものであや。Various scavenging hole shapes and stratified scavenging methods have been devised to reduce losses in blowing out fuel components in small two-stroke gasoline engines. The present invention focuses on the behavior of liquid fuel in the crank chamber or the scavenging passage, and controls the flow of liquid fuel only by appropriately determining the shape of the scavenging passage, thereby reducing the blowout loss of fuel components. Aya.

本発明の目的は、燃料成分の吹き抜は損失を低減して熱
効率並びに排気の改善された小形２サイクル機関を提供
するにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a small two-stroke engine with improved thermal efficiency and exhaust gas by reducing blowout loss of fuel components.

以下図面により発明の適用例につき詳述する。Application examples of the invention will be described in detail below with reference to the drawings.

図１は本発明を適用したシュニューレ掃気小形空冷２サ
イクルガソリン機関の掃気系を示す断面図であり、図２
は図１のＡ−Ａ断面における掃気通路形状を示す図であ
るＯ 図１、図２に示すように、本機関は略々対称に配置され
た三対の掃気孔を有し、又、掃気通路のクランク室側開
口部に液状燃料の溜り部（１０）が形成されている。FIG. 1 is a sectional view showing the scavenging system of a Schnurre scavenging small air-cooled two-stroke gasoline engine to which the present invention is applied, and FIG.
is a diagram showing the shape of the scavenging passage in the A-A cross section of Fig. 1. As shown in Figs. A liquid fuel reservoir (10) is formed at the crank chamber side opening of the passage.

観察によれば、機関の運転時、クランク室に吸入された
ガソリンの相当量はクランク塞内壁或いはクランク表面
に付着しだ液膜やクランク室空間（１２）を易動する液
体微粒子として存在し、これら液状燃料成分の多くは掃
気流と共に掃気通路（８）に流入する際、慣性のため掃
気通路（８）の外側内壁（１５）に衝突し、付着する。According to observations, when the engine is operated, a considerable amount of gasoline sucked into the crank chamber exists as a liquid film adhering to the crank wall or the crank surface or as liquid particles easily moving in the crank chamber space (12). When most of these liquid fuel components flow into the scavenging passage (8) with the scavenging air flow, they collide with and adhere to the outer inner wall (15) of the scavenging passage (8) due to inertia.

この壁面付着流の一部は掃気流と共にシリンダ内に流入
するが、一部はシリンダからクランク室への吹き戻し流
や重力の影響によりクランク室方向に流れる０従って、
図１、図２に示す如く、掃気通路のクランク室開口（９
）の下部に液状燃料の溜り部（１０）を形成しておくと
液体燃料の溜りＰが形成される。液状燃料の溜り部を形
成するｆｉ　（１４）の液体表面からの高さを、排気孔
（刀の側を高く、反排気孔側を低くした時、反排気孔側
の液体燃料は掃気流ｑによって吹い出されながら微粒化
され、その大部分は掃気流と共に掃気孔（３）、（４）
よりシリンダ内に流入する。従って、掃気孔（５）　、
（４）を経る掃気の燃料濃度は掃気孔（５）を経る掃気
のそれよりも濃い。かくして、排気孔から遠いシリンダ
空間に比較的燃料濃度の濃い新気を分布せしめることが
可能となり、シリンダから排気孔への燃料成分の流出を
低減することが出来るＯ 上述の如く、本発明によれば、機関構造の複雑化を招く
ことなく燃料成分の吹き抜は損失を低減し、以って機関
熱効率の向上と排気の浄化とを図ることが出来る・A part of this wall adhering flow flows into the cylinder together with the scavenging air flow, but a part flows in the direction of the crank chamber due to the blowback flow from the cylinder to the crank chamber and the influence of gravity.
As shown in Figs. 1 and 2, the crank chamber opening (9) of the scavenging passage
) A liquid fuel reservoir P is formed by forming a liquid fuel reservoir (10) in the lower part of the fuel tank. When the height from the liquid surface of fi (14) that forms the liquid fuel reservoir is set higher on the side of the exhaust hole (sword side) and lower on the side opposite to the exhaust hole, the liquid fuel on the side opposite to the exhaust hole becomes the scavenging flow q. The particles are atomized as they are blown out by the scavenging air flow, and most of them flow through the scavenging holes (3) and (4).
It flows into the cylinder. Therefore, the scavenging hole (5),
The fuel concentration of the scavenging air passing through (4) is higher than that of the scavenging air passing through the scavenging hole (5). In this way, it is possible to distribute fresh air with relatively high fuel concentration in the cylinder space far from the exhaust hole, and it is possible to reduce the outflow of fuel components from the cylinder to the exhaust hole.As described above, according to the present invention, For example, blowing out fuel components can reduce losses without complicating the engine structure, thereby improving engine thermal efficiency and purifying exhaust gas.

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

図１は本発明を適用したシュエエーレ掃気小形空冷２サ
イクルガソリン機関の掃気系を示す断面図であり、図２
は図１の機関の掃気通路を示す図である。これらの図に
おいて、（１戸’シリンダ、（り・・・排気孔、（６）
、（４）、（５）・・・掃気孔、（６）％（７）・・・
掃気孔仕切壁、（匂・・・掃気通路、（９）・・・掃気
通路入口１．ｃｌｏ）・・・液状燃料の溜り部、（１１
）・・・液状燃料の溜り部の底１．　（１２）−・・ク
チ・ンク室、＜１５）−・・クランクケース、（１４）
・・・液状燃料の溜り部Ｏ壁、（１５）・・・掃気通路
の外側内壁である０ Ｐ・・・溜り部に溜った液体燃料、Ｑ・・・掃気流、！
・・・燃料微粒子である。FIG. 1 is a sectional view showing the scavenging system of a Schweere scavenging small air-cooled two-stroke gasoline engine to which the present invention is applied, and FIG.
2 is a diagram showing a scavenging passage of the engine in FIG. 1. FIG. In these figures, (1 door' cylinder, (ri...exhaust hole, (6)
, (4), (5)... scavenging hole, (6)% (7)...
Scavenging hole partition wall, (odor... scavenging passage, (9)... scavenging passage inlet 1.clo)... liquid fuel reservoir, (11
)...Bottom of liquid fuel reservoir 1. (12) --- Crank chamber, <15) --- Crank case, (14)
...Liquid fuel reservoir O wall, (15)...Outside inner wall of the scavenging passage 0 P...Liquid fuel accumulated in the reservoir, Q...Scavenging air flow!
...They are fuel particles.

Claims (1)

【特許請求の範囲】[Claims] シリンダ内壁面に形成された掃気孔とクランク室とを連
通する掃気通路のクランク室側開口部近辺に、液状燃料
成分の溜り部を設け、該溜り部を形成する壁の形状を水
平線より見て排気孔側を高く、反排気孔側を低くしたこ
とを特徴とする火花点火シュニューレ掃気２サイクル内
燃機関。A reservoir for liquid fuel components is provided near the crank chamber side opening of the scavenging passage that communicates the scavenging holes formed in the inner wall surface of the cylinder with the crank chamber, and the shape of the wall forming the reservoir is observed from the horizontal line. A spark ignition schnule scavenged two-stroke internal combustion engine characterized by having a high exhaust hole side and a low exhaust hole side.
JP14667384A 1984-07-14 1984-07-14 Schnurle scavenging type two-cycle engine Pending JPS6125918A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14667384A JPS6125918A (en) 1984-07-14 1984-07-14 Schnurle scavenging type two-cycle engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14667384A JPS6125918A (en) 1984-07-14 1984-07-14 Schnurle scavenging type two-cycle engine

Publications (1)

Publication Number Publication Date
JPS6125918A true JPS6125918A (en) 1986-02-05

Family

ID=15413014

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14667384A Pending JPS6125918A (en) 1984-07-14 1984-07-14 Schnurle scavenging type two-cycle engine

Country Status (1)

Country Link
JP (1) JPS6125918A (en)

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