JP3828702B2 - Scavenging passage of a stratified scavenging two-cycle engine - Google Patents

Scavenging passage of a stratified scavenging two-cycle engine Download PDF

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JP3828702B2
JP3828702B2 JP2000006859A JP2000006859A JP3828702B2 JP 3828702 B2 JP3828702 B2 JP 3828702B2 JP 2000006859 A JP2000006859 A JP 2000006859A JP 2000006859 A JP2000006859 A JP 2000006859A JP 3828702 B2 JP3828702 B2 JP 3828702B2
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scavenging
cylinder
scavenging passage
passage
crankcase
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JP2001193466A (en
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亮二 座間
武志 渡辺
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小松ゼノア株式会社
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Priority to JP2000006859A priority Critical patent/JP3828702B2/en
Priority to US10/149,410 priority patent/US6691650B2/en
Priority to AU18875/01A priority patent/AU1887501A/en
Priority to PCT/JP2000/008788 priority patent/WO2001044634A1/en
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    • 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

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  • 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)

Description

【０００１】
【発明の属する技術分野】
本発明は、層状掃気２サイクルエンジンの、シリンダ室に開口する掃気口とクランク室とを接続する掃気通路に関する。
【０００２】
【従来の技術】
層状掃気２サイクルエンジンは、燃焼後のシリンダ内のガスを外部に排気するために、先導空気をシリンダ室内に送って掃気する掃気通路を有している。図５は従来の第１例の層状掃気２サイクルエンジンの正面断面図であり、図６は図５のＤ−Ｄ矢視図である。クランクケース３１の上面にはシリンダ３２が取着され、シリンダ３２にはピストン３３がシリンダ３２の軸芯方向に摺動自在に挿入されている。クランクケース３１にはクランク軸４が回転自在に取着され、ピストン３３とクランク軸４とはコネクティングロッド５により連結されている。図５においては、コネクティングロッド５の下部及びクランク軸４の上部は一部省略されている。図５及び図６において、シリンダ３２の壁面には、シリンダ室６に開口する排気口１０、一対の掃気口１１，１１、一対の先導空気口１２，１２が設けられるともに、クランク室７に開口する混合気口１３が設けられている。シリンダ３２の側壁内には前記一対の掃気口１１，１１とクランク室７とをそれぞれ接続する一対の掃気通路４０，４０が設けられ、これらの掃気通路４０，４０の下端部には開口部４１，４１がそれぞれ設けられている。ピストン３３の側面には、ピストン上死点近傍において一対の先導空気口１２，１２と一対の掃気口１１，１１とをそれぞれ接続するための一対の溝３４，３４が設けられている。排気口１０、掃気口１１，１１、先導空気口１２，１２、混合気口１３の開閉は、ピストン３３の上下動により行われるようになっている。
【０００３】
以下に掃気作用について説明する。ピストン上昇時にはクランク室７の圧力が低下し、ピストン上死点近傍において、先導空気は先導空気口１２，１２から吸入され、ピストン溝３４，３４を通って掃気口１１，１１から掃気通路４０、４０に充満される。同時に、燃料混合気は混合気口１３からクランク室７内に吸入される。シリンダ室６で混合気が着火、燃焼するとピストン３３は押し下げられ、先導空気口１２，１２及び混合気口１３は閉じられる。その後、先ず排気口１０が開いて排気が排出され、続いて掃気口１１，１１が開く。クランク室７の圧力は上昇して掃気通路４０，４０内の先導空気がシリンダ室６に流入して排気を排気口１０から外部に排出し、続いてクランク室７内の混合気が掃気通路４０，４０を通って掃気口１１，１１からシリンダ室６に流入する。したがって、排気口１０から外部への混合気の吹き抜けの量は低減され、排気が浄化される。
【０００４】
しかしながら、上記構成においては、先導空気の量は掃気通路４０の体積に等しく、その量が不十分なため、排気排出時に一部の混合気の吹き抜けがあり、十分に排気浄化の目的を達することが困難である。この問題を解決する先行技術として、例えば特開昭５８−５４２３号公報により層状掃気２サイクルエンジンが提案されている。図７は、同公報に記載されている第２例の層状掃気２サイクルエンジンの正面断面図である。ここでは、前記第１例と同一構成要素には同一符号を付して説明を省略し、異なる部分についてのみ説明する。図７において、シリンダ３２はクランクケース３５の上面に取着されている。掃気口１１は掃気通路４２を介してクランク室７に接続している。掃気通路４２はシリンダ３２の側壁内を通り、クランクケース３５の側壁内を通ってクランク室７の底部に設けられた開口部４３に連通している。すなわち、掃気通路４２の長さが長く、掃気通路容積は十分に大きくなっている。したがって、先導空気量は十分に確保され、混合気の吹き抜けは大幅に減少されて排気が浄化される。
【０００５】
【発明が解決しようとする課題】
しかしながら、上記特開昭５８−５４２３号公報に開示された層状掃気２サイクルエンジンの構成においては、掃気通路４２がクランクケース３５の側壁内に形成されているため、クランクケース３５の構造が複雑となり、さらに大型となって重量も重くなり、コストも高いという問題がある。
【０００６】
本発明は上記の問題点に着目し、先導空気量を十分に確保でき、かつ構造が簡単で小型軽量の層状掃気２サイクルエンジンの掃気通路を提供することを目的としている。
【０００７】
【課題を解決するための手段、作用及び効果】
上記目的を達成するために、本発明に係る層状掃気２サイクルエンジンの掃気通路の第１発明は、内側にクランク室を形成したクランクケースの上面に載置されたシリンダのシリンダ室に開口し、かつ外部から取り込んだ先導空気を吸入し、及び掃気する掃気口と、シリンダの内壁に対する外側に設けられ、かつ掃気口とクランク室とを連通する掃気通路とを有する層状掃気２サイクルエンジンの掃気通路において、前記掃気通路を、シリンダの内壁に対する外側の側壁内にシリンダの軸芯に対して略平行に設けられた第１掃気通路と、この第１掃気通路に対向するクランクケースの上面に前記第１掃気通路に対して略直角方向に広がりを持って設けられ、かつ端末部にクランク室に連通する開口部を有する第２掃気通路とより構成し、前記開口部及び第２掃気通路は、クランクケースの上面に設けられた凹部と、クランクケースの上面に当接したシリンダのシリンダベース面と、シリンダの側壁下部のシリンダスカート部と、シリンダスカート部の前記第２掃気通路に対向する部分を前記凹部の底面部に近接又は当接するように延伸して設けたシリンダスカート延伸部とにより形成された構成としている。
【０００８】
上記構成によれば、シリンダの内壁に対する外側の側壁内に設けられて掃気口に連通する第１掃気通路の下方に、クランクケース上面に凹部を設けてなる第２掃気通路を設け、この第２掃気通路の端末部に開口部を設けたため、大きな掃気通路容積を確保することができる。したがって、掃気に十分な先導空気量を確保でき、排気の浄化を確実に達成できる。また、第２掃気通路とその開口部とをクランクケース上面に設けた凹部と、シリンダベース面と、シリンダスカート部と、シリンダスカート延伸部とにより形成したため、構造が簡単になり、しかもクランクケースを小型で軽量にできるので、コストを安くすることができる。
【０００９】
【発明の実施の形態】
以下に、本発明に係る層状掃気２サイクルエンジンの掃気通路の実施形態について、図面を参照して詳述する。
【００１０】
図１は本発明に係る掃気通路を有するシリンダとクランクケースとの正面断面図であり、図２は図１のＡ−Ａ矢視図である。図１，２において、クランクケース１の上面８にはシリンダ２がシリンダベース面１６を当接して載置されており、図示しないボルトにより締着されている。シリンダ２の内壁には排気口１０、一対の掃気口１１，１１、一対の先導空気口１２，１２及び混合気口１３が開口している。シリンダ２の側壁内には、上部を掃気口１１，１１に連通し、かつ下部に開口部を有する、シリンダ軸芯に平行な一対の第１掃気通路２１，２１が設けられている。クランクケース１の上面８には、一対の第１掃気通路２１，２１の前記下部開口部にそれぞれ連通し、かつ第１掃気通路２１，２１に対して略直角方向に広がりを有する一対の凹部１４，１４が設けられ、それぞれの凹部１４，１４の端末部にはクランク室７に連通する開口部２３を有する一対の第２掃気通路２２，２２が設けられている。この第１掃気通路２１と第２掃気通路２２とは、掃気通路２０を構成している。
【００１１】
図３は図１のＢ−Ｂ矢視図であり、クランクケース２の上面８に形成された凹部１４の形状を示している。シリンダ２におけるシリンダスカート１７の第２掃気通路２２に対向する部分にはシリンダスカート延伸部１８が設けられ、その先端部は凹部１４の底面部１５に近接又は当接している。すなわち、第２掃気通路２２は、凹部１４と、シリンダベース面１６と、シリンダスカート部１７と、シリンダスカート延伸部１８とにより形成されている。また開口部２３は、図１のＣ−Ｃ矢視図である図４に示すように、凹部１４とシリンダベース面１６とシリンダスカート延伸部１８とにより形成されている。
【００１２】
本発明に係る層状掃気２サイクルエンジンの掃気通路２０は、上記のように第１掃気通路２１と第２掃気通路２２とにより構成したため、第２掃気通路２２の容積だけ従来のものより掃気通路２０の容積が大きくなり、その分先導空気量が多くなって排気浄化の目的を達成することができる。又、第２掃気通路２２及び開口部２３は、クランクケース１の上面８に設けた凹部１４と、シリンダベース面１６と、シリンダスカート部１７と、シリンダスカート延伸部１８とにより形成したため、構造が簡単で、しかも従来のクランクケース１の側壁内に掃気通路を設けた場合に比べてクランクケース１の側壁厚みを薄くできる。したがって、小型にでき、重量も軽くなり、コストを安くすることができる。
【図面の簡単な説明】
【図１】本発明に係る掃気通路を有するシリンダとクランクケースとの正面断面図である。
【図２】図１のＡ−Ａ矢視図である。
【図３】図１のＢ−Ｂ矢視図である。
【図４】図１のＣ−Ｃ矢視図である。
【図５】従来の第１例の層状掃気２サイクルエンジンの正面断面図である。
【図６】図５のＤ−Ｄ矢視図である。
【図７】従来の第２例の層状掃気２サイクルエンジンの正面断面図である。
【符号の説明】
１：クランクケース、２：シリンダ、６：シリンダ室、７：クランク室、８：クランクケース上面、１０：排気口、１１：掃気口、１２：先導空気口、１３：混合気口、１４：凹部、１５：底面部、１６：シリンダベース面、１７：シリンダスカート部、１８：シリンダスカート延伸部、２０：掃気通路、２１：第１掃気通路、２２：第２掃気通路、２３：開口部。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a scavenging passage that connects a scavenging port that opens to a cylinder chamber and a crank chamber of a stratified scavenging two-cycle engine.
[0002]
[Prior art]
The stratified scavenging two-cycle engine has a scavenging passage that sends leading air into the cylinder chamber for scavenging in order to exhaust the gas in the cylinder after combustion to the outside. FIG. 5 is a front sectional view of a conventional stratified scavenging two-cycle engine of the first example, and FIG. 6 is a view taken along the line DD in FIG. A cylinder 32 is attached to the upper surface of the crankcase 31, and a piston 33 is inserted into the cylinder 32 so as to be slidable in the axial direction of the cylinder 32. The crankshaft 4 is rotatably attached to the crankcase 31, and the piston 33 and the crankshaft 4 are connected by a connecting rod 5. In FIG. 5, the lower part of the connecting rod 5 and the upper part of the crankshaft 4 are partially omitted. 5 and 6, an exhaust port 10 that opens to the cylinder chamber 6, a pair of scavenging ports 11 and 11, and a pair of leading air ports 12 and 12 are provided on the wall surface of the cylinder 32, and the crank chamber 7 has an opening. An air-fuel mixture port 13 is provided. A pair of scavenging passages 40, 40 connecting the pair of scavenging ports 11, 11 and the crank chamber 7 are provided in the side wall of the cylinder 32, and an opening 41 is formed at the lower end of these scavenging passages 40, 40. , 41 are provided. A pair of grooves 34, 34 for connecting the pair of leading air ports 12, 12 and the pair of scavenging ports 11, 11 in the vicinity of the top dead center of the piston 33 are provided on the side surface of the piston 33. The exhaust port 10, the scavenging ports 11, 11, the leading air ports 12, 12, and the mixture port 13 are opened and closed by the vertical movement of the piston 33.
[0003]
The scavenging action will be described below. When the piston is raised, the pressure in the crank chamber 7 is reduced, and in the vicinity of the top dead center of the piston, the leading air is sucked from the leading air ports 12 and 12, passes through the piston grooves 34 and 34, and from the scavenging ports 11 and 11 to the scavenging passage 40, 40 will be charged. At the same time, the fuel mixture is sucked into the crank chamber 7 from the mixture port 13. When the air-fuel mixture is ignited and burned in the cylinder chamber 6, the piston 33 is pushed down, and the leading air ports 12 and 12 and the air-fuel mixture port 13 are closed. Thereafter, the exhaust port 10 is first opened to exhaust the exhaust gas, and then the scavenging ports 11 and 11 are opened. The pressure in the crank chamber 7 rises, leading air in the scavenging passages 40, 40 flows into the cylinder chamber 6, exhaust is exhausted to the outside from the exhaust port 10, and then the air-fuel mixture in the crank chamber 7 is scavenged in the scavenging passage 40. , 40 flows into the cylinder chamber 6 from the scavenging ports 11, 11. Therefore, the amount of air-fuel mixture blown out from the exhaust port 10 is reduced, and the exhaust gas is purified.
[0004]
However, in the above configuration, the amount of the leading air is equal to the volume of the scavenging passage 40, and the amount thereof is insufficient, so that some of the air-fuel mixture is blown out at the time of exhaust discharge, and the purpose of exhaust purification is sufficiently achieved. Is difficult. As a prior art for solving this problem, a stratified scavenging two-cycle engine has been proposed, for example, in Japanese Patent Laid-Open No. 58-5423. FIG. 7 is a front sectional view of a second example of the stratified scavenging two-cycle engine described in the publication. Here, the same components as those in the first example are denoted by the same reference numerals, description thereof is omitted, and only different portions will be described. In FIG. 7, the cylinder 32 is attached to the upper surface of the crankcase 35. The scavenging port 11 is connected to the crank chamber 7 via the scavenging passage 42. The scavenging passage 42 passes through the side wall of the cylinder 32, passes through the side wall of the crankcase 35, and communicates with an opening 43 provided at the bottom of the crank chamber 7. That is, the length of the scavenging passage 42 is long and the scavenging passage volume is sufficiently large. Therefore, a sufficient amount of leading air is ensured, and the blow-through of the air-fuel mixture is greatly reduced to purify the exhaust gas.
[0005]
[Problems to be solved by the invention]
However, in the configuration of the stratified scavenging two-cycle engine disclosed in Japanese Patent Laid-Open No. 58-5423, the scavenging passage 42 is formed in the side wall of the crankcase 35, so that the structure of the crankcase 35 becomes complicated. In addition, there is a problem that the size is larger, the weight is heavier, and the cost is higher.
[0006]
The present invention pays attention to the above problems, and an object of the present invention is to provide a scavenging passage of a stratified scavenging two-cycle engine that can secure a sufficient amount of leading air and has a simple structure and is small and light.
[0007]
[Means, actions and effects for solving the problems]
In order to achieve the above object, a first invention of a scavenging passage of a stratified scavenging two-cycle engine according to the present invention opens to a cylinder chamber of a cylinder placed on an upper surface of a crankcase having a crank chamber formed therein, A scavenging passage for a stratified scavenging two-cycle engine having a scavenging port for sucking and scavenging leading air taken from outside and a scavenging passage provided outside the inner wall of the cylinder and communicating the scavenging port with the crank chamber The scavenging passage is provided on the upper surface of the crankcase facing the first scavenging passage, and a first scavenging passage provided in the side wall on the outer side of the inner wall of the cylinder and substantially parallel to the axis of the cylinder. A second scavenging passage provided with an opening extending in a direction substantially perpendicular to the one scavenging passage and having an opening communicating with the crank chamber at the terminal portion; Mouth and the second scavenging passage includes a recess provided in the upper surface of the crankcase, and the cylinder base surface of contact with the cylinder on the upper surface of the crankcase, and a cylinder skirt portion of the lower side wall of the cylinder, the cylinder skirt A portion opposed to the second scavenging passage is formed by a cylinder skirt extending portion provided to extend so as to be close to or in contact with the bottom surface of the recess.
[0008]
According to the above configuration, the second scavenging passage having the recess on the upper surface of the crankcase is provided below the first scavenging passage provided in the outer side wall with respect to the inner wall of the cylinder and communicating with the scavenging port. Since the opening is provided at the end of the scavenging passage, a large scavenging passage volume can be secured. Therefore, a sufficient amount of leading air for scavenging can be secured, and exhaust gas purification can be reliably achieved. In addition, since the second scavenging passage and its opening are formed by a recess provided on the upper surface of the crankcase, a cylinder base surface, a cylinder skirt, and a cylinder skirt extension, the structure is simplified and the crankcase is Since it is small and lightweight, the cost can be reduced.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of a scavenging passage of a stratified scavenging two-cycle engine according to the present invention will be described in detail with reference to the drawings.
[0010]
FIG. 1 is a front sectional view of a cylinder and a crankcase having a scavenging passage according to the present invention, and FIG. 2 is a view taken along the line AA in FIG. 1 and 2, the cylinder 2 is placed on the upper surface 8 of the crankcase 1 with the cylinder base surface 16 in contact therewith, and is fastened by bolts (not shown). An exhaust port 10, a pair of scavenging ports 11, 11, a pair of leading air ports 12, 12 and a mixture port 13 are opened on the inner wall of the cylinder 2. In the side wall of the cylinder 2, a pair of first scavenging passages 21, 21 are provided parallel to the cylinder axis, the upper part communicating with the scavenging ports 11, 11 and the lower part having an opening. The upper surface 8 of the crankcase 1 communicates with the lower openings of the pair of first scavenging passages 21, 21 and has a pair of recesses 14 extending in a direction substantially perpendicular to the first scavenging passages 21, 21. , 14 are provided, and a pair of second scavenging passages 22, 22 having an opening 23 communicating with the crank chamber 7 are provided at the end portions of the respective recesses 14, 14. The first scavenging passage 21 and the second scavenging passage 22 constitute a scavenging passage 20.
[0011]
FIG. 3 is a BB arrow view of FIG. 1 and shows the shape of the recess 14 formed in the upper surface 8 of the crankcase 2 . A cylinder skirt extending portion 18 is provided at a portion of the cylinder 2 facing the second scavenging passage 22 of the cylinder skirt 17, and a tip portion thereof is close to or in contact with the bottom surface portion 15 of the recess 14. That is, the second scavenging passage 22 is formed by the concave portion 14, the cylinder base surface 16, the cylinder skirt portion 17, and the cylinder skirt extending portion 18. Moreover, the opening 23 is formed by the recessed part 14, the cylinder base surface 16, and the cylinder skirt extending | stretching part 18, as shown in FIG. 4 which is CC arrow directional view of FIG.
[0012]
Since the scavenging passage 20 of the stratified scavenging two-cycle engine according to the present invention is configured by the first scavenging passage 21 and the second scavenging passage 22 as described above, the scavenging passage 20 is larger than the conventional one by the volume of the second scavenging passage 22. As a result, the amount of the leading air is increased and the purpose of exhaust purification can be achieved. Further, since the second scavenging passage 22 and the opening 23 are formed by the recess 14 provided in the upper surface 8 of the crankcase 1, the cylinder base surface 16, the cylinder skirt portion 17, and the cylinder skirt extending portion 18, the structure The side wall thickness of the crankcase 1 can be reduced as compared with the conventional case where the scavenging passage is provided in the side wall of the crankcase 1. Accordingly, the size can be reduced, the weight can be reduced, and the cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a front sectional view of a cylinder and a crankcase having a scavenging passage according to the present invention.
FIG. 2 is a view taken in the direction of arrows AA in FIG.
FIG. 3 is a view taken along arrow BB in FIG. 1;
4 is a view taken along the line CC in FIG. 1. FIG.
FIG. 5 is a front sectional view of a first example of a conventional layered scavenging two-cycle engine.
6 is a view taken along the line DD in FIG. 5;
FIG. 7 is a front cross-sectional view of a conventional second example of a stratified scavenging two-cycle engine.
[Explanation of symbols]
1: crankcase, 2: cylinder, 6: cylinder chamber, 7: crank chamber, 8: top surface of crankcase, 10: exhaust port, 11: scavenging port, 12: leading air port, 13: air mixture port, 14: recess 15: bottom surface portion, 16: cylinder base surface, 17: cylinder skirt portion, 18: cylinder skirt extending portion, 20: scavenging passage, 21: first scavenging passage, 22: second scavenging passage, 23: opening.

Claims (1)

内側にクランク室(7)を形成したクランクケース(1)の上面に載置されたシリンダ(2)のシリンダ室(6)に開口し、かつ外部から取り込んだ先導空気を吸入し、及び掃気する掃気口(11)と、シリンダ(2)の内壁に対する外側に設けられ、かつ掃気口(11)とクランク室(7)とを連通する掃気通路(20)とを有する層状掃気２サイクルエンジンの掃気通路において、
前記掃気通路(20)を、シリンダ(2)の内壁に対する外側の側壁内にシリンダ(2)の軸芯に対して略平行に設けられた第１掃気通路(21)と、この第１掃気通路(21)に対向するクランクケース(1)の上面(8)に前記第１掃気通路(21)に対して略直角方向に広がりを持って設けられ、かつ端末部にクランク室(7)に連通する開口部(23)を有する第２掃気通路(22)とより構成し、
前記開口部(23)及び第２掃気通路(22)は、クランクケース(1)の上面(8)に設けられた凹部(14)と、クランクケース(1)の上面(8)に当接したシリンダ(2)のシリンダベース面(16)と、シリンダ(2)の側壁下部のシリンダスカート部(17)と、シリンダスカート部(17)の前記第２掃気通路(22)に対向する部分を前記凹部(14)の底面部(15)に近接又は当接するように延伸して設けたシリンダスカート延伸部(18)とにより形成されたことを特徴とする層状掃気２サイクルエンジンの掃気通路。The cylinder chamber (6) of the cylinder (2) mounted on the upper surface of the crankcase (1) formed with the crank chamber (7) on the inside opens into the cylinder chamber (6) and sucks and scavenges the leading air taken from the outside. Scavenging of a stratified scavenging two-cycle engine having a scavenging port (11) and a scavenging passage (20) provided outside the inner wall of the cylinder (2) and communicating the scavenging port (11) and the crank chamber (7) In the aisle,
The scavenging passage (20) includes a first scavenging passage (21) provided in a side wall outside the inner wall of the cylinder (2) and substantially parallel to the axis of the cylinder (2), and the first scavenging passage. An upper surface (8) of the crankcase (1) facing the (21) is provided to extend in a direction substantially perpendicular to the first scavenging passage (21), and communicates with the crank chamber (7) at the terminal portion. And a second scavenging passage (22) having an opening (23) for
The opening (23) and the second scavenging passage (22) are in contact with the recess (14) provided on the upper surface (8) of the crankcase (1) and the upper surface (8) of the crankcase (1). The cylinder base surface (16) of the cylinder (2), the cylinder skirt portion (17) at the bottom of the side wall of the cylinder (2), and the portion of the cylinder skirt portion (17) facing the second scavenging passage (22) are A scavenging passage for a stratified scavenging two-cycle engine, characterized in that it is formed by a cylinder skirt extending portion (18) provided so as to extend close to or abut on the bottom surface portion (15) of the recess (14).
JP2000006859A 1999-12-15 2000-01-14 Scavenging passage of a stratified scavenging two-cycle engine Expired - Lifetime JP3828702B2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2000006859A JP3828702B2 (en) 2000-01-14 2000-01-14 Scavenging passage of a stratified scavenging two-cycle engine
US10/149,410 US6691650B2 (en) 1999-12-15 2000-12-13 Piston valve type layered scavenging 2-cycle engine
AU18875/01A AU1887501A (en) 1999-12-15 2000-12-13 Piston valve type layered scavenging 2-cycle engine
PCT/JP2000/008788 WO2001044634A1 (en) 1999-12-15 2000-12-13 Piston valve type layered scavenging 2-cycle engine

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JP5088955B2 (en) * 2008-02-04 2012-12-05 株式会社やまびこ Air cleaner for stratified scavenging two-cycle internal combustion engine
JP5186704B2 (en) * 2008-08-12 2013-04-24 日立工機株式会社 2-cycle engine and tools
WO2022236479A1 (en) * 2021-05-08 2022-11-17 永康市茂金园林机械有限公司 Air inlet pipe of stratified scavenging two-stroke engine

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