JP2008138602A - Stratified scavenging 2-cycle engine - Google Patents

Stratified scavenging 2-cycle engine Download PDF

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JP2008138602A
JP2008138602A JP2006325873A JP2006325873A JP2008138602A JP 2008138602 A JP2008138602 A JP 2008138602A JP 2006325873 A JP2006325873 A JP 2006325873A JP 2006325873 A JP2006325873 A JP 2006325873A JP 2008138602 A JP2008138602 A JP 2008138602A
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passage
scavenging
cycle engine
sub
opening
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JP4912849B2 (en
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Buhei Kobayashi
武平 小林
Naohiro Akiyama
直寛 秋山
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Husqvarna Zenoah Co Ltd
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Husqvarna Zenoah Co Ltd
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    • 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

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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)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stratified scavenging 2-cycle engine capable of sufficiently exerting blow-by suppression effect by leading air even when an aperture is arranged in a sub-passage, and thereby remarkably reducing HC (exhaust gas value). <P>SOLUTION: This stratified scavenging 2-cycle engine 1 is structured to fill leading air in scavenging passages 6 from the sides of scavenging ports 6A. The scavenging passage 6 is provided with a main passage adjacent to an exhaust port, and the sub-passage adjacent to a suction port; the main passage is isolated from the sub-passage by a partition part 13; the aperture 63 is arranged in an intermediate part of the sub-passage; and the partition part 13 is provided, at a position on the scavenging port 6A side relative to the aperture 63, with a cutout part (opening) 14 making the main passage communicate with the sub-passage. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、層状掃気２サイクルエンジンに関する。   The present invention relates to a stratified scavenging two-cycle engine.

従来、一般的な２サイクルエンジンにおいて、掃気通路を排気ポート寄りのメイン通路と、吸気ポート寄りのサブ通路とで構成するとともに、サブ通路側の途中を絞ってノズル効果を付与することで流速が大きくなるように制御し、これにより掃気行程時の混合気の吹き抜けを抑制することが知られている（特許文献１）。   Conventionally, in a general two-cycle engine, the scavenging passage is composed of a main passage closer to the exhaust port and a sub passage closer to the intake port, and the flow velocity is reduced by applying a nozzle effect by narrowing the middle of the sub passage side. It is known that the air-fuel mixture is controlled so as to increase, thereby preventing the air-fuel mixture from blowing through during the scavenging stroke (Patent Document 1).

一方、２サイクルエンジンの中には、掃気ポート（燃焼室に開いた掃気通路の開口部分）側から掃気通路内に先導空気を充填し、掃気の際には先ず、混合気に先立って先導空気を掃気通路から燃焼室内に流入させ、よって混合気の吹き抜けを抑制する層状掃気２サイクルエンジンも知られている。   On the other hand, in a two-cycle engine, leading air is filled into the scavenging passage from the side of the scavenging port (opening portion of the scavenging passage opened to the combustion chamber), and at the time of scavenging, the leading air is first prior to the mixture. There is also known a stratified scavenging two-cycle engine that causes the gas to flow into the combustion chamber from the scavenging passage and thereby suppress the blow-through of the air-fuel mixture.

従って、層状掃気２サイクルエンジンに、メイン通路および絞りを有したサブ通路からなる掃気通路を採用すれば、流速制御による吹き抜け抑制効果と、先導空気による吹き抜け抑制効果とが得られることになるため、吹き抜けをより効果的に抑制できると考えられる。   Therefore, if a scavenging passage composed of a main passage and a sub passage having a throttle is employed in a stratified scavenging two-cycle engine, a blow-through suppressing effect by flow rate control and a blow-through suppressing effect by leading air can be obtained. It is considered that the blow-through can be more effectively suppressed.

特開昭６０−１５３４２８号公報JP 60-153428 A

しかしながら、サブ通路に絞りが設けられていると、クランクケース内の負圧を利用して先導空気を掃気ポート側から掃気通路内に充填する際には、その絞りが流路抵抗となって先導空気の吸入量が減少してしまうため、先導空気による混合気の吹き抜け抑制効果を十分に発揮できないという問題がある。   However, if a throttle is provided in the sub-passage, when the leading air is charged into the scavenging passage from the scavenging port side using the negative pressure in the crankcase, the throttling becomes the flow resistance and leads. Since the amount of air sucked decreases, there is a problem that the air-fuel mixture blow-out suppressing effect by the leading air cannot be sufficiently exhibited.

本発明の目的は、サブ通路内に絞りが設けられている場合でも、先導空気による吹き抜け抑制効果を十分に発揮でき、よってＴＨＣ（全炭化水素）を大幅に低減できる層状掃気２サイクルエンジンを提供することにある。   An object of the present invention is to provide a stratified scavenging two-cycle engine that can sufficiently exhibit the effect of suppressing blow-by by leading air even when a throttle is provided in the sub-passage, and thus can greatly reduce THC (total hydrocarbons). There is to do.

本発明の請求項１の層状掃気２サイクルエンジンは、掃気通路内に掃気ポート側から先導空気を充填するように構成された層状掃気２サイクルエンジンであって、前記掃気通路は、排気ポート寄りのメイン通路と、吸気ポート寄りのサブ通路とを備えているとともに、これらメイン通路およびサブ通路は仕切部によって仕切られており、前記サブ通路の途中には絞りが設けられ、前記仕切部には、前記絞りよりも前記掃気ポート側の位置に前記メイン通路と前記サブ通路とを連通させる開口が設けられていることを特徴とする。   The stratified scavenging two-cycle engine according to claim 1 of the present invention is a stratified scavenging two-cycle engine configured to fill the scavenging passage with leading air from the scavenging port side, the scavenging passage closer to the exhaust port. A main passage and a sub-passage near the intake port are provided, and the main passage and the sub-passage are partitioned by a partition portion, and a throttle is provided in the middle of the sub-passage. An opening for communicating the main passage and the sub passage is provided at a position closer to the scavenging port than the throttle.

本発明の請求項２の層状掃気２サイクルエンジンは、請求項１に記載の層状掃気２サイクルエンジンにおいて、前記開口の前記先導空気の流れ方向の長さ寸法は、前記仕切部の全体の長さ寸法の５〜２０％であり、絞り面積に対して前記開口により形成される通路面積の比が４５〜１５０％であることを特徴とする。   The stratified scavenging two-cycle engine according to claim 2 of the present invention is the stratified scavenging two-cycle engine according to claim 1, wherein the length dimension of the opening in the flow direction of the leading air is the total length of the partition portion. It is 5 to 20% of the dimension, and the ratio of the passage area formed by the opening to the aperture area is 45 to 150%.

本発明の請求項３の層状掃気２サイクルエンジンは、請求項１または請求項２に記載の層状掃気２サイクルエンジンにおいて、前記開口は、前記仕切部に設けられた切欠部で形成されていることを特徴とする。   The stratified scavenging two-cycle engine according to claim 3 of the present invention is the stratified scavenging two-cycle engine according to claim 1 or 2, wherein the opening is formed by a notch provided in the partition portion. It is characterized by.

以上において、請求項１の発明によれば、メイン通路とサブ通路とを連通させる開口が設けられているので、サブ通路側に絞りを設けることでこの絞りが流路抵抗となる場合でも、充填させる先導空気を絞りの手前側から開口を通してサブ通路側に十分な量だけ吸引でき、掃気行程においては、先導空気による混合気の吹き抜けを確実に抑制できる。従って、絞りでの流速制御による吹き抜け抑制効果と、先導空気による吹き抜け抑制効果との両方を発揮させることができ、排気ガスを大幅にクリーンにできる。   In the above, according to the first aspect of the present invention, since the opening for communicating the main passage and the sub passage is provided, even when the restriction is provided on the sub passage side and the restriction becomes the flow path resistance, the filling is performed. A sufficient amount of the leading air to be sucked can be sucked from the front side of the throttle to the sub-passage side through the opening, and in the scavenging stroke, the blow-through of the air-fuel mixture by the leading air can be reliably suppressed. Therefore, both the blow-through suppressing effect by the flow velocity control at the throttle and the blow-through suppressing effect by the leading air can be exhibited, and the exhaust gas can be greatly cleaned.

請求項２の発明によれば、開口の大きさとして最適な値にできるため、吹き抜けをより効果的に抑制できる。
請求項３の発明によれば、開口を切欠部で形成するので、形状を簡素化でき、製造も簡単である。 According to invention of Claim 2, since it can be set as the optimal value as a magnitude | size of opening, a blow-through can be suppressed more effectively.
According to invention of Claim 3, since opening is formed by a notch part, a shape can be simplified and manufacture is also easy.

以下、本発明の一実施形態を図面に基づいて説明する。
図１は、本実施形態に係る層状掃気２サイクルエンジン（以下、単にエンジンと称する）１の斜視図。図２は、エンジン１の一部を断面した斜視図。
図１、図２に示すエンジン１において、シリンダ３の側方には、クランクケース４内に混合気を供給する吸気通路５と、一対の掃気通路６内に先導空気を供給する先導空気通路７とが設けられ、これらの通路５，７の燃焼室８を挟んだ反対側には排気通路９が設けられている。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a stratified scavenging two-cycle engine (hereinafter simply referred to as an engine) 1 according to the present embodiment. FIG. 2 is a perspective view of a part of the engine 1.
In the engine 1 shown in FIGS. 1 and 2, on the side of the cylinder 3, an intake passage 5 that supplies air-fuel mixture into the crankcase 4 and a leading air passage 7 that supplies leading air into the pair of scavenging passages 6. The exhaust passage 9 is provided on the opposite side of the passages 5 and 7 with the combustion chamber 8 interposed therebetween.

吸気通路５は、ピストン２の上下動（図中の上下の意）によって開閉する吸気ポート５Ａを備え、ピストン２の上昇時に開いて、負圧となるクランクケース４内に混合気が吸引される。一方、ピストン２の外周には、ピストン２の上昇に伴って先導空気通路７と連通する一対の凹部１０が設けられており、先導空気通路７からの先導空気が凹部１０を通って掃気通路６内に掃気ポート６Ａ側から充填される。   The intake passage 5 is provided with an intake port 5A that opens and closes when the piston 2 moves up and down (up and down in the drawing). The intake port 5A is opened when the piston 2 is lifted, and the air-fuel mixture is sucked into the crankcase 4 that becomes negative pressure. . On the other hand, a pair of recesses 10 communicating with the leading air passage 7 as the piston 2 rises is provided on the outer periphery of the piston 2, and the leading air from the leading air passage 7 passes through the recess 10 and the scavenging passage 6. The inside is filled from the scavenging port 6A side.

ピストン２が下降して掃気ポート６Ａが燃焼室８内に開くと、クランクケース４内に供給された混合気が掃気通路６を通って燃焼室８内に供給される。この際、予め掃気通路６内の掃気ポート６Ａ側に充填されていた先導空気が最初に燃焼室８に入り込み、この先導空気が排気ポート９Ａ側に回り込んで吹き抜け側に流れるため、混合気が吹き抜けるのを抑制できる。   When the piston 2 descends and the scavenging port 6 </ b> A opens into the combustion chamber 8, the air-fuel mixture supplied into the crankcase 4 is supplied into the combustion chamber 8 through the scavenging passage 6. At this time, since the leading air previously filled in the scavenging port 6A side in the scavenging passage 6 first enters the combustion chamber 8, this leading air circulates to the exhaust port 9A side and flows to the blowout side, so that the air-fuel mixture is It can suppress blowing through.

図３には、掃気ポート６Ａ部分の平断面図が示されている。図１〜図３に示すように、掃気ポート６Ａを有する掃気通路６は、シリンダ３の径方向に対向して２箇所に設けられており、吸気通路５や排気通路９に対して略９０°ずれた位置に設けられている。また、シリンダ３には、燃焼室８と外部と連通する開口部３Ａが設けられている。そして、掃気通路６の大部分は、開口部３Ａの内面と、この開口部３Ａに嵌め込まれるカバー１１とによって区画される空間で形成されている。   FIG. 3 shows a plan sectional view of the scavenging port 6A portion. As shown in FIGS. 1 to 3, the scavenging passage 6 having the scavenging port 6 </ b> A is provided at two locations facing the radial direction of the cylinder 3, and is approximately 90 ° with respect to the intake passage 5 and the exhaust passage 9. It is provided at a shifted position. The cylinder 3 is provided with an opening 3 </ b> A that communicates with the combustion chamber 8 and the outside. Most of the scavenging passage 6 is formed by a space defined by the inner surface of the opening 3A and the cover 11 fitted in the opening 3A.

図３において、掃気通路６は、先導空気および混合気を燃焼室８に対して略接線方向から流入させる形状に設けられている。また、カバー１１の内面（掃気通路６に臨む面）には、燃焼室８側に向けて突出したヒレ状の仕切部１３が設けられている。そして、本実施形態での掃気通路６は、仕切部１３により、排気ポート９Ａ寄りに設けられて通路面積が大きいメイン通路６１と、吸気ポート５Ａ寄りに設けられて通路面積が小さいサブ通路６２とに分かれており、通路面積が小さいことで絞られたサブ通路６２側からは、流速が制御された混合気が流入する。   In FIG. 3, the scavenging passage 6 is provided in a shape that allows the leading air and the air-fuel mixture to flow into the combustion chamber 8 from a substantially tangential direction. Further, a fin-like partitioning portion 13 protruding toward the combustion chamber 8 is provided on the inner surface of the cover 11 (the surface facing the scavenging passage 6). The scavenging passage 6 in the present embodiment includes a main passage 61 having a large passage area provided near the exhaust port 9A and a sub-passage 62 having a small passage area provided near the intake port 5A. An air-fuel mixture with a controlled flow velocity flows from the side of the sub-passage 62 that has been narrowed down due to the small passage area.

しかも、サブ通路６２においては、図１、図３に示すように、その流路面積をさらに絞る絞り６３が設けられている。この絞り６３により、サブ通路６２からは流速が制御された先導空気および混合気を燃焼室８に流入させることができ、混合気の吹き抜けを確実に抑制できるのである。ところが、この絞り６３を設けるだけでは、クランクケース４内の負圧により先導空気を掃気通路６内に充填する際に、この絞り６３が流路抵抗となり、先導空気を十分に充填できない。   In addition, as shown in FIGS. 1 and 3, the sub passage 62 is provided with a throttle 63 that further restricts the flow passage area. The throttle 63 allows the leading air and the air-fuel mixture, whose flow rates are controlled, to flow into the combustion chamber 8 from the sub-passage 62, and the blow-through of the air-fuel mixture can be reliably suppressed. However, only by providing this throttle 63, when the leading air is charged into the scavenging passage 6 by the negative pressure in the crankcase 4, the throttle 63 becomes a flow path resistance, and the leading air cannot be sufficiently charged.

そこで、図４に示すカバー１１において、仕切部１３の下端側（図示しないクランクケース側）にはメイン通路６１とサブ通路６２とを連通させる切欠部（開口）１４が設けられている。このようなカバー１１が開口部３Ａに嵌め込まれると切欠部１４は、絞り６３の掃気ポート６Ａ側に位置することになる。   Therefore, in the cover 11 shown in FIG. 4, a notch (opening) 14 that connects the main passage 61 and the sub passage 62 is provided on the lower end side (the crankcase side not shown) of the partition portion 13. When such a cover 11 is fitted into the opening 3 </ b> A, the notch 14 is positioned on the scavenging port 6 </ b> A side of the throttle 63.

この切欠部１４での先導空気の流れ方向に沿った長さ寸法ｌの最適値は、絞り６３の大きさや、エンジン１の排気量、マフラ容積、吸気から排気までの全流路抵抗などで異なるが、概略仕切部１３の長さ寸法Ｌの５〜２０％、より好ましくは約１６％程度である。また、この際の絞り６３部分の通路面積に対して切欠部１４により形成される通路面積の比は４５〜１５０％、より好ましくは１２０％である。   The optimum value of the length dimension l along the flow direction of the leading air at the notch 14 differs depending on the size of the throttle 63, the displacement of the engine 1, the volume of the muffler, the total flow resistance from intake to exhaust, and the like. However, it is 5 to 20% of the length dimension L of the general partition part 13, More preferably, it is about 16%. At this time, the ratio of the passage area formed by the notch 14 to the passage area of the restrictor 63 is 45 to 150%, more preferably 120%.

切欠部１４が設けられていると、掃気ポート６Ａ側からサブ通路６２側に充填される先導空気は、絞り６３の手前で切欠部１４を通ってメイン通路６１側に流れる。従って、絞り６３が設けられている場合でも、より多くの先導空気を充填させることができ、掃気行程では、先導空気による混合気の吹き抜け抑制効果を十分に発揮させることができる。このため、絞り６３による流速制御での吹き抜け抑制効果と相俟って、ＴＨＣ（全炭化水素）を大幅に低減できる。   When the cutout portion 14 is provided, the leading air filled from the scavenging port 6A side to the sub passage 62 side flows through the cutout portion 14 before the throttle 63 to the main passage 61 side. Therefore, even when the throttle 63 is provided, more leading air can be filled, and in the scavenging stroke, the effect of suppressing the blow-through of the air-fuel mixture by the leading air can be sufficiently exhibited. For this reason, THC (total hydrocarbons) can be greatly reduced in combination with the effect of suppressing blow-by in the flow rate control by the throttle 63.

図５には、全体の長さ寸法Ｌが１２．５mmの仕切部１３に、長さ寸法ｌがそれぞれ０mm、１mm、２mm、３mm、４mmの切欠部１４を設けた場合のエンジンにおいてＨＣを測定し、その測定結果が示されている。０mmとは切欠部１４が存在しない場合である。また、表示データは、最高出力点（７５００rpm）での全開回転時のみのＴＨＣ（全炭化水素）である。燃料流量は各水準で同等となるように調整されている。   FIG. 5 shows the measurement of HC in an engine in which a notch 14 having a length dimension 1 of 0 mm, 1 mm, 2 mm, 3 mm, and 4 mm is provided in a partition 13 having a total length L of 12.5 mm. The measurement results are shown. 0 mm is the case where the notch 14 does not exist. Further, the display data is THC (total hydrocarbons) only at the fully open rotation at the maximum output point (7500 rpm). The fuel flow rate is adjusted to be equal at each level.

この測定の結果、２mmの長さ寸法ｌの切欠部１４を設けた場合が、ＨＣの値が最低となり、吹き抜け抑制効果を最も良好に発揮させることができた。このことにより、本発明の効果を確認できた。また、３mmおよび４mmの長さ寸法ｌの切欠部１４では、切欠部１４を設けない場合よりもかえってＨＣが多くなることがわかった。これは、切欠部１４の長さ寸法ｌに最適値が存在することを意味すると考えられ、本測定によれば、その最適値は長さ寸法Ｌの約１６％であると確認された。   As a result of this measurement, when the notch 14 having a length 1 of 2 mm was provided, the HC value was the lowest, and the effect of suppressing blow-through could be exhibited best. This confirmed the effect of the present invention. Further, it has been found that the HC increases more in the cutout portion 14 having the length 1 of 3 mm and 4 mm than in the case where the cutout portion 14 is not provided. This is considered to mean that there is an optimum value for the length dimension l of the notch 14, and according to this measurement, the optimum value was confirmed to be about 16% of the length dimension L.

なお、本発明を実施するための最良の構成、方法などは、以上の記載で開示されているが、本発明は、これに限定されるものではない。すなわち、本発明は、主に特定の実施形態に関して特に図示され、かつ説明されているが、本発明の技術的思想および目的の範囲から逸脱することなく、以上述べた実施形態に対し、形状、数量、その他の詳細な構成において、当業者が様々な変形を加えることができるものである。
従って、上記に開示した形状、数量などを限定した記載は、本発明の理解を容易にするために例示的に記載したものであり、本発明を限定するものではないから、それらの形状、数量などの限定の一部もしくは全部の限定を外した部材の名称での記載は、本発明に含まれるものである。 The best configuration, method, and the like for carrying out the present invention have been disclosed above, but the present invention is not limited to this. That is, the invention has been illustrated and described with particular reference to certain specific embodiments, but without departing from the spirit and scope of the invention, Various modifications can be made by those skilled in the art in terms of quantity and other detailed configurations.
Therefore, the description limited to the shape, quantity and the like disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such restrictions is included in this invention.

例えば、前記実施形態では、本発明の開口として、仕切部１３の下端に切欠部１４が設けられていたが、仕切部１３の下端よりも僅かに上側に角孔開口や丸孔開口など、任意の形状の開口部を設け、この開口部を本発明の開口としてもよい。   For example, in the embodiment described above, the notch portion 14 is provided at the lower end of the partition portion 13 as the opening of the present invention, but an arbitrary opening such as a square hole opening or a round hole opening slightly above the lower end of the partition portion 13 is provided. It is good also as providing the opening part of this shape, and making this opening part the opening of this invention.

さらに、前記実施形態では、カバー１１に本発明の仕切部１３が設けられていたが、製造手法によっては、そのようなカバー１１を設けることなく仕切部や、その仕切部の開口を設けることも可能であり、そのような場合でも本発明に含まれる。   Furthermore, in the said embodiment, although the partition part 13 of this invention was provided in the cover 11, depending on a manufacturing method, a partition part and the opening of the partition part may be provided without providing such a cover 11. It is possible and such a case is included in the present invention.

本発明は、層状掃気構造を有した２サイクルエンジンに有効に利用できる。   The present invention can be effectively used for a two-cycle engine having a stratified scavenging structure.

本発明の一実施形態に係る層状掃気２サイクルエンジンを示す斜視図。1 is a perspective view showing a stratified scavenging two-cycle engine according to an embodiment of the present invention. ２サイクルエンジンを一部断面して示す斜視図。The perspective view which shows a two-cycle engine partially in cross section. ２サイクルエンジンの要部を断面して示す平断面図。The cross-sectional view which shows the principal part of a 2-cycle engine in cross section. ２サイクルエンジンの構成部材の内面側を一部断面して示す図The figure which shows the inner surface side of the component member of a two-cycle engine in partial cross section 本発明の効果の確認を説明するための図。The figure for demonstrating confirmation of the effect of this invention.

符号の説明Explanation of symbols

１…層状掃気２サイクルエンジン、６…掃気通路、６Ａ…掃気ポート、１３…仕切部、１４…開口である切欠部、６１…メイン通路、６２…サブ通路。   DESCRIPTION OF SYMBOLS 1 ... Stratified scavenging two-cycle engine, 6 ... Scavenging passage, 6A ... Scavenging port, 13 ... Partition part, 14 ... Notch part which is an opening, 61 ... Main passage, 62 ... Sub passage

Claims (3)

掃気通路内に掃気ポート側から先導空気を充填するように構成された層状掃気２サイクルエンジンであって、
前記掃気通路は、排気ポート寄りのメイン通路と、吸気ポート寄りのサブ通路とを備えているとともに、
これらメイン通路およびサブ通路は仕切部によって仕切られており、
前記サブ通路の途中には絞りが設けられ、
前記仕切部には、前記絞りよりも前記掃気ポート側の位置に前記メイン通路と前記サブ通路とを連通させる開口が設けられている
ことを特徴とする層状掃気２サイクルエンジン。 A stratified scavenging two-cycle engine configured to fill the scavenging passage with leading air from the scavenging port side,
The scavenging passage includes a main passage near the exhaust port and a sub passage near the intake port,
These main passage and sub passage are partitioned by a partition,
A throttle is provided in the middle of the sub passage,
The stratified scavenging two-cycle engine is characterized in that the partition is provided with an opening communicating the main passage and the sub passage at a position closer to the scavenging port than the throttle. 請求項１に記載の層状掃気２サイクルエンジンにおいて、
前記開口の前記先導空気の流れ方向の長さ寸法は、前記仕切部の全体の長さ寸法の５〜２０％であり、絞り面積に対して前記開口により形成される通路面積の比が４５〜１５０％である
ことを特徴とする層状掃気２サイクルエンジン。 The stratified scavenging two-cycle engine according to claim 1,
The length dimension of the opening in the flow direction of the leading air is 5 to 20% of the entire length dimension of the partition portion, and the ratio of the passage area formed by the opening to the throttle area is 45 to 50%. A stratified scavenging two-cycle engine characterized by being 150%. 請求項１または請求項２に記載の層状掃気２サイクルエンジンにおいて、
前記開口は、前記仕切部に設けられた切欠部で形成されている
ことを特徴とする層状掃気２サイクルエンジン。 The stratified scavenging two-cycle engine according to claim 1 or 2,
The opening is formed by a notch provided in the partition part. A stratified scavenging two-cycle engine, wherein:
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Publication number Priority date Publication date Assignee Title
CN101896703B (en) * 2007-12-14 2011-12-07 富世华智诺株式会社 Scavenging cover and two-cycle engine
WO2009078452A1 (en) * 2007-12-14 2009-06-25 Husqvarna Zenoah Co., Ltd. Scavenging cover and two-cycle engine
US8459217B2 (en) 2007-12-14 2013-06-11 Husqvarna Zenoah Co., Ltd. Scavenging cover and two-cycle engine
JP2012092846A (en) * 2008-09-24 2012-05-17 Makita Corp Stratified scavenging two-stroke engine
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JP2010216394A (en) * 2009-03-17 2010-09-30 Hitachi Koki Co Ltd Two-stroke cycle engine and engine work machine equipped with the same
JP2011127448A (en) * 2009-12-15 2011-06-30 Maruyama Mfg Co Ltd Method of manufacturing cylinder for engine, die of cylinder for engine and cylinder for engine
US8726859B2 (en) 2010-06-22 2014-05-20 Kawasaki Jukogyo Kabushiki Kaisha Two-stroke cycle combustion engine of air scavenging type
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JP2014508876A (en) * 2011-02-03 2014-04-10 ハスクバーナ・ゼノア株式会社 Stratified scavenging two-stroke engine
WO2012104919A1 (en) 2011-02-03 2012-08-09 Husqvarna Zenoah Co., Ltd. Stratified scavenging two-stroke engine
US8833316B2 (en) 2011-02-03 2014-09-16 Husqvarna Zenoah Co., Ltd. Stratified scavenging two-stroke engine

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