JPS60173314A - Scavenging passage in two-cycle internal combustion engine - Google Patents

Scavenging passage in two-cycle internal combustion engine

Info

Publication number
JPS60173314A
JPS60173314A JP2890084A JP2890084A JPS60173314A JP S60173314 A JPS60173314 A JP S60173314A JP 2890084 A JP2890084 A JP 2890084A JP 2890084 A JP2890084 A JP 2890084A JP S60173314 A JPS60173314 A JP S60173314A
Authority
JP
Japan
Prior art keywords
scavenging
scavenging passage
passage
wall
air
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
JP2890084A
Other languages
Japanese (ja)
Inventor
Takeo Kimoto
木本　武夫
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 JP2890084A priority Critical patent/JPS60173314A/en
Publication of JPS60173314A publication Critical patent/JPS60173314A/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
    • 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
    • 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)
  • Supercharger (AREA)

Abstract

PURPOSE:To enhance the restraining effect of abnormal combustion upon combustion of lean mixture, by allowing scavenging air stream to impinge upon a stepped part. CONSTITUTION:Upon scavenging air which flows into a scavenging passage 11 from a crank chamber 6 through the inlet port 12 of the scavenging passage, flows along the outer wall 14 of the scavenging passage due to its inertia. Since the component of scavenging stream which particularly has a high flow rate and a large inertia flows in the close proximity of the wall 14, the scavenging air impinges upon a stepped part 10 so that the flow rate of the scavenging air is reduced. During the initial period during which the flow rate of the scavenging air is high, the restraining effect of scavenging stream due to the stepped part is further remarkable.

Description

【発明の詳細な説明】 本発明はクランク室圧縮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 the shape of a scavenging passage for a two-cycle crank chamber compression internal combustion engine.

本発明は従来方式の掃気通路の改良により掃気流速を制
御して掃気を改善し得るものである。The present invention improves scavenging by controlling the scavenging flow rate by improving the conventional scavenging passage.

本発明の目的は掃気の制御により、クランク室圧縮２サ
イクル内燃機関の熱効率と排気とを改善するにある。An object of the present invention is to improve the thermal efficiency and exhaust gas of a two-cycle crank chamber compression internal combustion engine by controlling scavenging air.

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 explained in detail below with reference to the drawings.

図は本発明を適用したクランク室圧縮シュニューレ掃気
空冷２サイクルガソリン機関のＪｉｉｌ気通路全通路断
面図である。図において、クランクケースに形成された
掃気通路（１１）とシリンダに形成された掃気通路（９
）の断面形状を若干異なるものとして、掃気通路を形成
する外側壁（１３）と（１４）の間に段差（１０）を生
ぜしめである。このような掃気通路においては、掃気時
、クランク室（６）より掃気通路入口（１２）を経て掃
気通路内に流入する掃気は、慣性のため、掃気通路の外
側Ｗ（１４）寄りを流れる。The figure is a sectional view of the whole air passage of a crank chamber compression schnula scavenged air-cooled two-stroke gasoline engine to which the present invention is applied. In the figure, a scavenging passage (11) formed in the crankcase and a scavenging passage (9) formed in the cylinder are shown.
) have a slightly different cross-sectional shape to create a step (10) between the outer walls (13) and (14) forming the scavenging passage. In such a scavenging passage, during scavenging, the scavenging air flowing into the scavenging passage from the crank chamber (6) via the scavenging passage entrance (12) flows near the outside W (14) of the scavenging passage due to inertia.

特に、流速が速く慣性の大きい成分は壁（１４）の極く
近辺を流れるため段差部（１０）にぶつかってその速度
を減ぜられる。（（６気初期の流速が最も速い時期にお
い６て、段差部による掃気流速の抑制効果は一層顕著と
なる。このようにして相対的に流速の大きい掃気成分の
速度が抑えられ、速度分布がより平均化された掃気がシ
リンダ内に開孔する掃気孔（８）を経てシリンダ内に流
入する。段差のない滑らかな掃気通路においては、部分
的に速度の大きい成分がシリンダ内に流入し、先頭吹き
抜Ｇｊ損失となるばかりか、シリンダ内高温残留ガスと
の混合が憩み、ノッキング等の巣常熔焼の原因となる。In particular, components with high flow velocity and large inertia flow very close to the wall (14), so they collide with the step (10) and have their speed reduced. ((6) The effect of suppressing the scavenging air flow velocity by the stepped portion becomes even more remarkable in the period when the flow velocity is the fastest in the initial stage of the air. In this way, the velocity of the scavenging air component with a relatively high flow velocity is suppressed, and the velocity distribution is More averaged scavenging air flows into the cylinder through the scavenging hole (8) opened in the cylinder.In a smooth scavenging passage with no steps, components with a partially high velocity flow into the cylinder. Not only will this result in loss of Gj from the top blowout, but the mixture with the high-temperature residual gas in the cylinder will slow down, causing permanent melting of the gas, such as knocking.

他方１本発明を適用した機関の実騎によれば、特に希薄
燃焼時において異常燃焼の抑止効果が著しく、熱効率も
５％程度向上した。なお１掃気通路内段差による有効断
面積の減少分は掃気通路の断面積拡大により補うことが
できる。On the other hand, according to an actual test of an engine to which the present invention was applied, the effect of suppressing abnormal combustion was remarkable, especially during lean combustion, and the thermal efficiency was also improved by about 5%. Note that the reduction in the effective cross-sectional area due to the difference in level within the scavenging passage can be compensated for by expanding the cross-sectional area of the scavenging passage.

上述の如く、本発明は極めてｆｉｊｔ単な構造であるが
、その効果は相当大きいのである。As mentioned above, although the present invention has a very simple structure, its effects are quite large.

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

図は本発明を適用したクランク室圧縮シュニューレ掃気
空冷２サイクルガソリン機関の掃気通路を示す断面図で
、図において、（υ・・・シリンダ、（２）・・・クラ
ンクケース、（３）・・・ピストン、（４）・・・ピス
トンピン、（５）・・・コンロッド、（６）・・・クラ
ンク室、（７）−・−排気孔、（８）・・・掃気孔、（
９）、（１１）・・・掃気通路、（１０）・・・掃気通
路内壁の段差部、（１２）’・・掃気通路入口、（１３
）、（１４）・・・掃気通路を形成する外側壁。The figure is a sectional view showing the scavenging passage of a crank chamber compression schnulae scavenging air-cooled two-stroke gasoline engine to which the present invention is applied. In the figure, (υ... cylinder, (2)... crankcase, (3)...・Piston, (4)...Piston pin, (5)...Connecting rod, (6)...Crank chamber, (7)...-Exhaust hole, (8)...Scavenging hole, (
9), (11)...Scavenging passage, (10)...Step part on the inner wall of the scavenging passage, (12)'...Scavenging passage entrance, (13)
), (14)... Outer wall forming a scavenging passage.

Claims (1)

【特許請求の範囲】[Claims] シリンダ内壁に形成されてピストン側面により開閉され
る掃気孔を有するクランク室圧縮２サイクル内燃機関に
おいて、前記掃気孔とクランク室とを連通ずるＮ気通路
の内壁に段差を形成して、該内壁近辺を流れる掃気流が
該段差部分に倫突するようにしたことを特徴とする掃気
通路形状。In a crank chamber compression two-stroke internal combustion engine having a scavenging hole formed in the inner wall of the cylinder and opened and closed by the side surface of the piston, a step is formed on the inner wall of the N air passage that communicates the scavenging hole with the crank chamber, and a step is formed in the vicinity of the inner wall. A scavenging passage having a shape such that a scavenging air flow flowing through the scavenging passage collides with the stepped portion.
JP2890084A 1984-02-18 1984-02-18 Scavenging passage in two-cycle internal combustion engine Pending JPS60173314A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2890084A JPS60173314A (en) 1984-02-18 1984-02-18 Scavenging passage in two-cycle internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2890084A JPS60173314A (en) 1984-02-18 1984-02-18 Scavenging passage in two-cycle internal combustion engine

Publications (1)

Publication Number Publication Date
JPS60173314A true JPS60173314A (en) 1985-09-06

Family

ID=12261275

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2890084A Pending JPS60173314A (en) 1984-02-18 1984-02-18 Scavenging passage in two-cycle internal combustion engine

Country Status (1)

Country Link
JP (1) JPS60173314A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7536982B2 (en) 2002-10-11 2009-05-26 Kawasaki Jukogyo Kabushiki Kaisha Two-cycle combustion engine of air scavenging type

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7536982B2 (en) 2002-10-11 2009-05-26 Kawasaki Jukogyo Kabushiki Kaisha Two-cycle combustion engine of air scavenging type

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