JPS6114427A - Scavenging port for two-cycle engine - Google Patents

Scavenging port for two-cycle engine

Info

Publication number
JPS6114427A
JPS6114427A JP13581984A JP13581984A JPS6114427A JP S6114427 A JPS6114427 A JP S6114427A JP 13581984 A JP13581984 A JP 13581984A JP 13581984 A JP13581984 A JP 13581984A JP S6114427 A JPS6114427 A JP S6114427A
Authority
JP
Japan
Prior art keywords
scavenging
wall
cylinder
hole
convex part
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
JP13581984A
Other languages
Japanese (ja)
Inventor
Taisei Ri
大成 李
Hando Jo
徐　判道
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
Nippon Clean Engine Laboratory Co
Original Assignee
NIPPON CLEAN ENGINE RES
Nippon Clean Engine Laboratory Co
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, Nippon Clean Engine Laboratory Co filed Critical NIPPON CLEAN ENGINE RES
Priority to JP13581984A priority Critical patent/JPS6114427A/en
Publication of JPS6114427A publication Critical patent/JPS6114427A/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
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supercharger (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

PURPOSE:To make a scavenging port sectional area takable so large enough, by forming a long convex part in an inner wall surface of the wall of a scavenging port proximate to a cylinder head, in a flowing direction of scavenging air, while making a sectional form vertical with a longitudinal direction of the convex part wider in a root of the convex part but narrower in proportion as it goes to the tip end. CONSTITUTION:A convex part 8 long in a flowing direction of scavenging air is formed in an inner wall surface 7 of a wall 7 at the side of a cylinder head forming a scavenging port 3. A sectional form vertical with a longitudinal direction of the convex part 8 is made wider in a root of the convex part but narrower in proportion as it goes to the tio end whereby a tip end 9 is extremely small in width. When scavenging air flows into a cylinder from a scavenging passage 13 via the scavenging port 3, a scavenging air stream is divided into two parts, bordering the tip end 9, namely, a flow little to a wall 1 at the exhaust side forming the scavenging port and another flow little to a wall 12 at the opposite exhaust port side forming the scavenging port.

Description

【発明の詳細な説明】 本発明は２サイクル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 engine.

２サイクル機関の掃気の制御を容易ならしめるため、掃
気孔を複数対に形成することが通常行われている。この
場合、シリンダ内壁に形成される掃気化出口の断面積は
掃気孔間の仕切壁によって制限され、機関出力を制約す
る要因となる。In order to facilitate the control of scavenging air in a two-stroke engine, it is common practice to form scavenging holes in a plurality of pairs. In this case, the cross-sectional area of the scavenging outlet formed on the inner wall of the cylinder is limited by the partition walls between the scavenging holes, which becomes a factor that limits the engine output.

本発明の掃気孔は掃気孔間の仕切壁を設けることなく仕
切壁と同様の効果をもたらすものである。The scavenging holes of the present invention provide the same effect as partition walls without providing partition walls between the scavenging holes.

本発明の目的は機関出力を制約することなく掃気の制御
を容易ならしめ、以って性能の優れた２サイクル機関を
提供するにある。An object of the present invention is to provide a two-stroke engine with excellent performance by facilitating scavenging control without restricting engine output.

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

図１は本発明を適用した機関のシリンダ断面図、図２は
図１に於けるＡＡ断面の断面図、図５は図１においてＰ
方向から見た掃気孔の形状、図４は図２に於けるＢＢ断
面の断面図である。FIG. 1 is a sectional view of a cylinder of an engine to which the present invention is applied, FIG. 2 is a sectional view of the AA section in FIG. 1, and FIG.
The shape of the scavenging hole as seen from the direction, FIG. 4 is a sectional view taken along the line BB in FIG.

図２、図３に示されているように、本機関の掃気孔（３
）の形状は通常の掃気孔と異り、掃気孔を形成するシリ
ンダヘッド側の壁（７）の内壁面（６）に掃気Ｏ流れ方
向に長い凸部（８）が形成されている。該凸部（８）の
長手方向と垂直な断面形状は図４の如く凸部のつけ根を
巾広く、先端に行くに従って巾を小さくとり、先端部（
９）は極く小さい巾で掃気孔内部に突き出ている。As shown in Figures 2 and 3, the scavenging holes (3
) is different from a normal scavenging hole in that a protrusion (8) long in the flow direction of the scavenging air O is formed on the inner wall surface (6) of the wall (7) on the cylinder head side forming the scavenging hole. The cross-sectional shape perpendicular to the longitudinal direction of the protrusion (8) is as shown in FIG.
9) protrudes inside the scavenging hole with an extremely small width.

掃気過程に於いて、掃気が掃気通路（１３）から掃気孔
（３〕を経てシリンダ内空間（１４）に流入する際、そ
の慣性により掃気は掃気孔を形成するシリンダヘッド側
の壁面に押しつけられながらシリンダ内に吹き出す。従
って、掃４孔形状を図２．１図３、図４に示す如く形成
した彎金、掃、気流は凸部の先端（９）を境に、掃気孔
を形成する排気孔側の壁（１１）寄りの流れと、掃気孔
を形成する反排気孔側の壁（１２）寄りの流れとに分け
られる。さらに、凸部の先端（９）を境として両側の斜
面（１５）、（１６）の形状を変えることにより、２つ
に分けられた掃気流のシリンダ内への吹き出し角度を各
々別個に適切に決定することが可能となる。During the scavenging process, when the scavenging air flows from the scavenging passage (13) through the scavenging hole (3) into the cylinder internal space (14), the scavenging air is pressed against the cylinder head side wall forming the scavenging hole due to its inertia. Therefore, the scavenging holes are formed with the four scavenging holes shown in Figures 2.1, 3, and 4. The flow is divided into the flow toward the wall (11) on the exhaust hole side and the flow toward the wall (12) on the opposite side of the exhaust hole forming the scavenging hole.Furthermore, the slopes on both sides with the tip (9) of the convex portion as the boundary By changing the shapes of (15) and (16), it becomes possible to appropriately determine the blowing angles of the two divided scavenging air flows into the cylinder separately.

以上の如く、本発明の適用例に於いては、従来のような
掃気孔の仕切壁を設けずして、それと同様の作用を得る
ことが出来るのであり、仕切壁がないだけ掃気孔断面積
を大きくとることが出来るのである。As described above, in the application example of the present invention, it is possible to obtain the same effect as the conventional partition wall of the scavenging hole, and the cross-sectional area of the scavenging hole is reduced by the absence of the partition wall. It is possible to make it larger.

又、掃気孔を従来の如く複数個に完全に仕切った上、仕
切られた掃気孔の一部又は全部に本発明を適用すること
により、掃気を一層改善することが可能となる。Further, by completely partitioning the scavenging holes into a plurality of holes as in the past and applying the present invention to some or all of the partitioned scavenging holes, it is possible to further improve scavenging.

以上述べた如く、本発明により掃気を改曽して性能の優
れた２サイクル機関の製造が可能となる０なお、図２、
図３、図４に示す如く、本発明の適用に際しては製造技
術上の問題、製造コストの上昇等の欠点は全くない。As described above, the present invention makes it possible to manufacture a two-stroke engine with excellent performance by improving scavenging.
As shown in FIGS. 3 and 4, when the present invention is applied, there are no drawbacks such as problems in manufacturing technology or increase in manufacturing costs.

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

図１は本発明を適用した機関のシリンダ断面図であり丸
図２、図４は掃気孔形状を示す断面図であり、図３は図
１においてＰ方向から見た掃気孔の形状を示す−。これ
らの図において、（１）・・・シリンダ、（２）・・・
排気孔、（３）・・・掃気孔、（４）・・・吸気孔、（
５〕・・・シリンダ対称面、（６）・・・掃気孔のシリ
ンダヘッド側内壁面、（７）・・・掃気孔を形成するシ
リンダヘッド側の壁、（８）・・・掃気孔を形成するシ
リンダヘッド側の内壁に形成された凸部、（９）・・・
凸部の先端、（１０）・・・掃気通路の外側壁、（１１
）・・・掃気孔を形成する排気孔側の壁、（１２）−・
・掃気孔を形成する反排気孔側の壁、（１３）−・・掃
気通路、（１４）・・・シリンダ内空間、（１５）、（
１６）・・・凸部を形成する斜面である。 図１ ＢFIG. 1 is a cross-sectional view of a cylinder of an engine to which the present invention is applied, circle diagram 2, and FIG. 4 are cross-sectional views showing the shape of the scavenging hole. FIG. . In these figures, (1)... cylinder, (2)...
Exhaust hole, (3)...Scavenging hole, (4)...Intake hole, (
5]...Cylinder symmetry plane, (6)...Cylinder head side inner wall surface of the scavenging hole, (7)...Cylinder head side wall forming the scavenging hole, (8)...Cylinder head side wall forming the scavenging hole. Convex portions formed on the inner wall of the cylinder head to be formed, (9)...
Tip of convex portion, (10)... Outer wall of scavenging passage, (11
)...Wall on the exhaust hole side forming the scavenging hole, (12)--
・Wall on the side opposite to the exhaust hole forming the scavenging hole, (13) -... scavenging passage, (14)... cylinder interior space, (15), (
16)...It is a slope forming a convex portion. Figure 1B

Claims (3)

【特許請求の範囲】[Claims] （１）シリンダ軸と排気孔中心とを通る面（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てピ
ストンの往復運動により開閉される掃気孔を有する２サ
イクル機関に於いて、該掃気孔を形成する壁のうち、シ
リンダヘッドに近い壁の内壁面に、掃気の流れ方向に長
い凸部を形成し、該凸部の長手方向と垂直な断面形状を
、凸部のつけ根を巾広く、先端に行くに従つて巾を小さ
くとり、先端部に於いては極く小さい巾で突出させた形
状としたことを特徴とする掃気孔形状。(1) In a two-stroke engine that has a scavenging hole that is formed approximately symmetrically with respect to a plane passing through the cylinder axis and the center of the exhaust hole (hereinafter referred to as the "cylinder symmetry plane") and that is opened and closed by the reciprocating movement of the piston. Among the walls forming the scavenging hole, a protrusion long in the flow direction of the scavenging air is formed on the inner wall surface of the wall near the cylinder head, and the cross-sectional shape perpendicular to the longitudinal direction of the protrusion is A scavenging hole shape characterized by having a wide base, a narrower width toward the tip, and a protruding shape with an extremely small width at the tip. （２）前記「特許請求の範囲」（１）に於いて、掃気孔
内壁に形成された凸部の先端部を曲線状に形成し、掃気
流を排気孔と反対側のシリンダ空間に方向づけたことを
特徴とする掃気孔形状。(2) In claim (1) above, the tip of the convex portion formed on the inner wall of the scavenging hole is formed in a curved shape to direct the scavenging air flow to the cylinder space on the opposite side of the exhaust hole. The scavenging hole shape is characterized by: （３）シリンダ対称面に対して対称に、シリンダ内壁面
に開孔する複数対の掃気孔を有する２サイクル機関に於
いて、全部の掃気孔又は一部の掃気孔の形状を上記「特
許請求の範囲」（１）又は（２）と同様の形状としたこ
とを特徴とする掃気孔形状。(3) In a two-stroke engine having multiple pairs of scavenging holes opened in the inner wall surface of the cylinder symmetrically with respect to the plane of symmetry of the cylinder, the shapes of all or some of the scavenging holes are A scavenging hole shape characterized by having a shape similar to "(1) or (2)".
JP13581984A 1984-06-30 1984-06-30 Scavenging port for two-cycle engine Pending JPS6114427A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13581984A JPS6114427A (en) 1984-06-30 1984-06-30 Scavenging port for two-cycle engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13581984A JPS6114427A (en) 1984-06-30 1984-06-30 Scavenging port for two-cycle engine

Publications (1)

Publication Number Publication Date
JPS6114427A true JPS6114427A (en) 1986-01-22

Family

ID=15160542

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13581984A Pending JPS6114427A (en) 1984-06-30 1984-06-30 Scavenging port for two-cycle engine

Country Status (1)

Country Link
JP (1) JPS6114427A (en)

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