JP4878265B2 - 2-cycle engine - Google Patents

2-cycle engine Download PDF

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JP4878265B2
JP4878265B2 JP2006304142A JP2006304142A JP4878265B2 JP 4878265 B2 JP4878265 B2 JP 4878265B2 JP 2006304142 A JP2006304142 A JP 2006304142A JP 2006304142 A JP2006304142 A JP 2006304142A JP 4878265 B2 JP4878265 B2 JP 4878265B2
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passage
air
scavenging
guide surface
combustion chamber
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JP2008121461A (en
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直寛 秋山
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Husqvarna Zenoah Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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Description

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

従来、２サイクルエンジンにおいて、混合気の排気ポートへの吹き抜けを抑制してＴＨＣ（全炭化水素）の排出量を低減するとともに、掃気効率を上昇させて燃焼室内に充填される混合気濃度を高め、燃焼を改善してエンジン出力を向上させる提案がなされている（特許文献１）。   Conventionally, in a two-cycle engine, the amount of THC (total hydrocarbons) emitted is reduced by suppressing the blow-through of the mixture to the exhaust port, and the scavenging efficiency is increased to increase the concentration of the mixture filled in the combustion chamber. A proposal has been made to improve combustion by improving engine output (Patent Document 1).

具体的には、掃気通路の掃気ポートに連なる上面とシリンダ中心に対して直角な方向線とがなす吹き上げ角を、シリンダの周方向において異なるように構成し、吸気ポート寄りの吹き上げ角を排気ポート寄りの吹き上げ角よりも大きくし、混合気を燃焼室内に充填させる際の上方への吹き上げ状態を周方向で異ならせるようにしている。   Specifically, the blow-up angle formed by the upper surface connected to the scavenging port of the scavenging passage and the direction line perpendicular to the cylinder center is configured to be different in the circumferential direction of the cylinder, and the blow-up angle near the intake port is set to the exhaust port. It is larger than the close-up blow angle, and the upward blow-up state when the air-fuel mixture is filled in the combustion chamber is made different in the circumferential direction.

ところで、従来の掃気通路としては、混合気を燃焼室の略接線方向から充填する形状になっている場合が多い。つまり、排気ポートに対して遠ざかる方向で略接線方向に混合気を充填させるのであり、こうすることで混合気の吹き抜けを抑制しているのである（特許文献２）。   By the way, as a conventional scavenging passage, the air-fuel mixture is often filled from a substantially tangential direction of the combustion chamber. That is, the air-fuel mixture is filled in a direction substantially tangential in a direction away from the exhaust port, and this prevents the air-fuel mixture from blowing through (Patent Document 2).

特開２００１−１８２５４１号公報JP 2001-182541 A 特開昭６０−１５３４２８号公報JP 60-153428 A

しかしながら、特許文献１では、混合気の充填方向がシリンダ中心に沿っており、略接線方向から充填されていない。従って、特許文献２に示すような略接線方向から充填するような形状の掃気通路では、特許文献１に記載したような吹き上げ角を適用すると、かえって十分に吹き抜けを抑制できず、出力の向上もさほど望めない可能性がある。   However, in Patent Document 1, the filling direction of the air-fuel mixture is along the center of the cylinder and is not filled from the substantially tangential direction. Therefore, in the scavenging passage having a shape filled from the substantially tangential direction as shown in Patent Document 2, if the blowing angle as described in Patent Document 1 is applied, the blow-through cannot be sufficiently suppressed, and the output is improved. It may not be possible to expect much.

本発明の目的は、混合気を燃焼室に対して略接線方向から充填する場合でも、吹き抜けを良好に抑制でき、かつ出力を確実に向上させることができる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 two-cycle engine capable of satisfactorily suppressing blow-through and reliably improving output even when an air-fuel mixture is charged from a substantially tangential direction with respect to a combustion chamber.

本発明の請求項１の２サイクルエンジンは、掃気通路を流れる混合気が排気ポート側から吸気ポート側に向かうように燃焼室に対して略接線方向から流入する２サイクルエンジンであって、前記掃気通路は、前記排気ポート寄りのメイン通路と、前記吸気ポート寄りのサブ通路とを備えているとともに、前記掃気通路内の前記吸気ポート側の位置には、前記混合気を前記接線方向よりも外方側に案内する案内面が設けられ、この案内面と前記燃焼室の内周面との間には、当該案内面で案内された混合気がぶつかる段差部が設けられ、前記段差部は前記燃焼室と外部とを連通する開口部の内面の一部で形成され、前記案内面は当該開口部に嵌め込まれるカバーの一部で形成されていることを特徴とする。
なお、ここでの「略接線方向」とは、厳密に接線方向である必要はなく、燃焼室の中心に向かう径方向に対して吸気ポート側にずれた方向をいう。 The two-cycle engine according to claim 1 of the present invention is a two-cycle engine in which the air-fuel mixture flowing through the scavenging passage flows from the exhaust port side toward the intake port side from a substantially tangential direction with respect to the combustion chamber. The passage includes a main passage closer to the exhaust port and a sub-passage closer to the intake port, and the air-fuel mixture is disposed outside the tangential direction at a position on the intake port side in the scavenging passage. square side guide surface for guiding is provided, between the inner peripheral surface of the combustion chamber and the guide surface, the stepped portion mixture which is guided in the guide surface collides is provided, the stepped portion is the It is formed by a part of the inner surface of the opening that communicates the combustion chamber and the outside, and the guide surface is formed by a part of a cover that is fitted into the opening .
Here, the “substantially tangential direction” does not need to be strictly tangential, but refers to a direction shifted toward the intake port side with respect to the radial direction toward the center of the combustion chamber.

本発明の請求項２の２サイクルエンジンは、請求項１に記載の２サイクルエンジンにおいて、前記メイン通路の通路断面積と前記サブ通路の通路断面積とは、互いに異なっていることを特徴とする。 2-cycle engine according to claim 2 of the present invention, in the two-cycle engine according to claim 1, the cross-sectional area of the main passage and the passage sectional area of said sub-passage, and characterized in that there I different from each other To do.

本発明の請求項３の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２サイクルエンジンにおいて、先導空気通路を備えた層状掃気２サイクルエンジンであることを特徴とする。 A two-cycle engine according to a third aspect of the present invention is the two-cycle engine according to the first or second aspect , wherein the two-cycle engine is a stratified scavenging two-cycle engine having a leading air passage.

以上において、請求項１の発明によれば、サブ通路から燃焼室に流入しようとする混合気は、接線方向から外方に外れて段差部にぶつかり、渦流を発生させる。この渦流はメイン通路からの混合気の流れを変化させ、掃気効率および燃焼状態を改善させる。従って、混合気の吹き抜けをより確実に抑制でき、燃焼効率も向上するので、混合気が燃焼室に対して接線方向から流入する２サイクルエンジンであっても、排ガスを綺麗にでき、出力をアップさせることができる。   In the above, according to the first aspect of the present invention, the air-fuel mixture that is about to flow into the combustion chamber from the sub-passage moves outward from the tangential direction and collides with the step portion to generate a vortex. This vortex changes the mixture flow from the main passage and improves scavenging efficiency and combustion conditions. Therefore, it is possible to more reliably suppress air-fuel mixture blow-through and improve combustion efficiency, so even in a two-cycle engine where the air-fuel mixture flows from the tangential direction to the combustion chamber, exhaust gas can be cleaned and the output increased. Can be made.

また、請求項１の発明によれば、掃気通路はカバー側と燃焼室側（すなわちシリンダ側）とで分割可能に形成されるため、案内面や段差部を容易に形成でき、製造が簡単である。
請求項２の発明によれば、通路断面積の大小により、通路を流れる混合気の流速を制御できる。従って、エンジンサイズや混合気等の燃焼室への流入角度に応じて通路断面積を適正に設定することで、渦流の発生を適正にでき、混合気の吹き抜けの防止、および出力向上をより確実に実現できる。
請求項３の発明によれば、層状掃気構造を有しているため、吹き抜ける際には、混合気に代わって先導空気が排出されるようになり、一層クリーンな排ガスにできる。 In addition, according to the invention of claim 1 , since the scavenging passage is formed so as to be split between the cover side and the combustion chamber side (that is, the cylinder side), the guide surface and the stepped portion can be easily formed, and the manufacture is simple. is there.
According to the invention of claim 2 , the flow velocity of the air-fuel mixture flowing through the passage can be controlled by the size of the passage cross-sectional area. Therefore, by appropriately setting the cross-sectional area of the passage according to the inflow angle of the engine size, air-fuel mixture, etc. into the combustion chamber, the generation of vortex flow can be made appropriate, the air-fuel mixture is prevented from being blown out, and the output is more reliably improved Can be realized.
According to the invention of claim 3 , since it has a layered scavenging structure, when it blows through, the leading air is discharged instead of the air-fuel mixture, so that a cleaner exhaust gas can be obtained.

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において、エンジン１は、層状掃気２サイクルエンジンであって、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 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.
1 and 2, the engine 1 is a stratified scavenging two-cycle engine, and an intake passage 5 for supplying an air-fuel mixture into a crankcase 4 and a pair of scavenging passages 6 are provided on the side of the cylinder 3. A leading air passage 7 for supplying leading air is provided, and an 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および燃焼室８の間を隔てる隔壁３Ｂと、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 3A that communicates with the combustion chamber 8 and the outside. Most of the scavenging passage 6 is formed by a space defined by a partition wall 3B separating the opening 3A and the combustion chamber 8 and a cover 11 fitted in the opening 3A.

図３において、掃気通路６を形成する開口部３Ａの内面のうち、排気ポート９Ａに近い側の壁面１２には、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案内面１２１が設けられている。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案内部１３が設けられている。そして、この案内部１３の両面を形成する案内面１３１も同様に、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向きで形成されている。さらに、カバー１１の内面には、案内部１４が設けられている。   In FIG. 3, the guide surface that allows the leading air and the air-fuel mixture to flow into the combustion chamber 8 from the substantially tangential direction on the wall surface 12 near the exhaust port 9 </ b> A among the inner surface of the opening 3 </ b> A that forms the scavenging passage 6. 121 is provided. Further, a fin-shaped guide 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). Similarly, the guide surfaces 131 that form both surfaces of the guide portion 13 are formed in a direction in which the leading air and the air-fuel mixture flow into the combustion chamber 8 from a substantially tangential direction. Further, a guide portion 14 is provided on the inner surface of the cover 11.

案内部１４は、案内面１３１と略平行な第１案内面１４１と、図４に示すように、第１案内面１４１の図中の上部側に連続した第２案内面（本発明の案内面）１４２とからなり、この第２案内面１４２の上下寸法が掃気ポート６Ａの上下寸法と略同じに設けられている。これらの案内面１２１，１３１，１４１，１４２により、掃気通路６からの先導空気および混合気は、排気ポート９Ａ側から吸気ポート５Ａ（図１、図２）側に向けて、燃焼室８に対して略接線方向から流入する。第２案内面１４２の下方は、隔壁３Ｂと近接対向する対向面１４３である。   The guide portion 14 includes a first guide surface 141 that is substantially parallel to the guide surface 131 and a second guide surface that continues to the upper side of the first guide surface 141 in the drawing as shown in FIG. 4 (the guide surface of the present invention). 142), and the vertical dimension of the second guide surface 142 is substantially the same as the vertical dimension of the scavenging port 6A. By these guide surfaces 121, 131, 141, 142, the leading air and the air-fuel mixture from the scavenging passage 6 are directed to the combustion chamber 8 from the exhaust port 9A side toward the intake port 5A (FIGS. 1 and 2). Inflow from the tangential direction. Below the second guide surface 142 is a facing surface 143 that is in close proximity to the partition wall 3B.

なお、本実施形態での掃気通路６は、前記ヒレ状の案内部１３により、排気ポート９Ａ寄りに設けられて通路断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断面積が小さいサブ通路６２とに分かれており、通路断面積が小さいことで絞られたサブ通路６２側からは、より流速の早い混合気が流入する。   In this embodiment, the scavenging passage 6 is provided near the exhaust port 9A by the fin-shaped guide portion 13 and has a large passage cross-sectional area, and is provided near the intake port 5A and the cross-sectional area of the passage. Is divided into small sub-passages 62, and an air-fuel mixture with a higher flow velocity flows from the side of the sub-passage 62 that is narrowed down due to the small passage cross-sectional area.

ところで、図４に示すカバー１１において、各通路６１，６２を形成する部分の上面１４４，１４５は、混合気を上方に向けてスムース案内するように、Ｒ形状を伴って上方に拡開している。ただし、これら上面１４４，１４５の吹き上げ角は略同じであり、特許文献１で示されている程は異なっていない。また、図４に示す第２案内面１４２は、第１案内面１４１に対して外方側に大きく折曲している。   Incidentally, in the cover 11 shown in FIG. 4, the upper surfaces 144 and 145 of the portions forming the passages 61 and 62 are expanded upward with an R shape so as to smoothly guide the air-fuel mixture upward. Yes. However, the blow-up angles of these upper surfaces 144 and 145 are substantially the same, and are not different as shown in Patent Document 1. Further, the second guide surface 142 shown in FIG. 4 is greatly bent outward with respect to the first guide surface 141.

従来において、混合気を燃焼室に対して略接線方向から流入させる形状の掃気通路では、本実施形態のような第１案内面１４１に対して大きく折曲した第２案内面１４２は存在せず、図３中に２点鎖線で示すように、第１案内面１４１を延設させた形状の案内面が存在するだけであった。つまり、そのような案内面と燃焼室の内周面との間には、製造上不可欠な段差は存在するものの、積極的に段差が設けられることはなく、混合気を燃焼室の内周面に沿うように流入させるのが一般的であった。   Conventionally, in the scavenging passage in which the air-fuel mixture flows into the combustion chamber from a substantially tangential direction, the second guide surface 142 that is greatly bent with respect to the first guide surface 141 as in this embodiment does not exist. As shown by a two-dot chain line in FIG. 3, there is only a guide surface having a shape in which the first guide surface 141 is extended. In other words, there is a step that is indispensable for manufacturing between such a guide surface and the inner peripheral surface of the combustion chamber, but there is no positive step, and the air-fuel mixture can be removed from the inner peripheral surface of the combustion chamber. It was common to let it flow in along.

これに対して本実施形態では、第２案内面１４２が大きく折曲していることで、第２案内面１４２と燃焼室８の内周面との間には大きな段差部１５が設けられている。この段差部１５は、シリンダ３の開口部３Ａ内面の一部で形成され、先導空気および混合気の流れに渦流を生じさせるために積極的に設けられている。この段差部１５を有していることが、本発明の最も特徴的な構成である。   On the other hand, in the present embodiment, the second guide surface 142 is greatly bent, so that a large step portion 15 is provided between the second guide surface 142 and the inner peripheral surface of the combustion chamber 8. Yes. The step portion 15 is formed by a part of the inner surface of the opening 3A of the cylinder 3, and is actively provided to generate a vortex in the flow of the leading air and the air-fuel mixture. Having the step portion 15 is the most characteristic configuration of the present invention.

従って、本実施形態に設けられた掃気通路６では、第２案内面１４２で案内されたサブ通路６２側からの先導空気および混合気は、図３中に二点鎖線で示す接線方向から外れてさらに外方側を流れ、この第２案内面１４２と燃焼室８の内周面との間に形成された段差部１５にぶつかる。このことにより、サブ通路６２からの流れに渦流が発生するとともに、その渦流がメイン通路６１からの流れに変化を及ぼす。これにより、掃気効率および燃焼状態を改善することになり、ＴＨＣやＨＣ（排ガス値）の減少、および出力の向上を実現できる。   Therefore, in the scavenging passage 6 provided in the present embodiment, the leading air and the air-fuel mixture from the side of the sub passage 62 guided by the second guide surface 142 deviate from the tangential direction indicated by the two-dot chain line in FIG. Further, it flows on the outer side and hits a step portion 15 formed between the second guide surface 142 and the inner peripheral surface of the combustion chamber 8. As a result, a vortex is generated in the flow from the sub passage 62, and the vortex changes the flow from the main passage 61. As a result, the scavenging efficiency and the combustion state are improved, and THC and HC (exhaust gas value) can be reduced and the output can be improved.

図５には、本実施形態のエンジン１、および段差部１５が設けられていない従来のエンジンを用い、回転数に応じた修正出力、ＴＨＣ濃度、およびＨＣ排出率を測定した。ここで、エンジン１と従来のエンジンとでは、最高出力点での燃料流量が同じになるように調整されている。   In FIG. 5, using the engine 1 of the present embodiment and a conventional engine in which the step portion 15 is not provided, the corrected output corresponding to the rotational speed, the THC concentration, and the HC emission rate were measured. Here, the engine 1 and the conventional engine are adjusted to have the same fuel flow rate at the maximum output point.

この測定の結果、（Ａ）に示すように、エンジン１の出力の方が従来のエンジンの出力よりも大きいと認められる。また、（Ｂ）、（Ｃ）に示すように、エンジン１のＴＨＣ濃度およびＨＣ排出率の方が通常のエンジンよりも少ないと認められる。このことにより、本発明の効果を確認することができた。   As a result of this measurement, as shown in (A), it is recognized that the output of the engine 1 is larger than the output of the conventional engine. Further, as shown in (B) and (C), it is recognized that the THC concentration and the HC emission rate of the engine 1 are smaller than those of a normal engine. Thus, the effect of the present invention could be confirmed.

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、前記実施形態のエンジン１は層状掃気エンジンであったが、先導空気が掃気ポートに充填させることのない通常の２サイクルエンジンであってもよく、このような場合でも、程度の差はあるが、前記実施形態と同様な傾向の結果を得ることができ、本発明の目的を達成できる。   For example, although the engine 1 of the above embodiment is a stratified scavenging engine, it may be a normal two-cycle engine in which the leading air is not filled into the scavenging port. Even in such a case, there is a difference in degree. However, the result of the tendency similar to the said embodiment can be obtained, and the objective of this invention can be achieved.

また、前記実施形態では、サブ通路６２の通路断面積は、メイン通路６１の通路断面積よりも僅かに小さかったが、これらが同程度あるいはサブ通路側の通路断面積を絞って一層小さくした場合でも、前記実施形態と同様な傾向の効果を得ることができ、本発明に含まれる。さらに、エンジンサイズや先導空気および混合気の流入方向によっては、メイン通路側の通路断面積をサブ通路の通路断面積より小さくすることも考えられ、このような場合でも本発明に含まれる。   In the above embodiment, the passage cross-sectional area of the sub passage 62 is slightly smaller than the passage cross-sectional area of the main passage 61. However, the effect of the same tendency as the above embodiment can be obtained, and is included in the present invention. Further, depending on the engine size and the inflow direction of the leading air and the air-fuel mixture, it is possible to make the passage cross-sectional area on the main passage side smaller than the passage cross-sectional area of the sub-passage, and such a case is also included in the present invention.

さらに、前記実施形態では、カバー１１に本発明の案内面としての第３案内面１４３が設けられ、開口部３Ａの内面の一部で段差部１５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や開口部３Ａを設けることなく案内面および段差部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 3rd guide surface 143 as a guide surface of this invention was provided in the cover 11, and the level | step-difference part 15 was provided in a part of inner surface of the opening part 3A, depending on a manufacturing method, It is also possible to provide a guide surface and a stepped portion without providing such a cover 11 or opening 3A, and such a case is also included in the present invention.

本発明は、層状掃気構造を有した２サイクルエンジンの他、層状掃気構造を有しない通常の２サイクルエンジンにも利用できる。   The present invention can be used not only for a two-cycle engine having a stratified scavenging structure but also for an ordinary two-cycle engine not having a stratified scavenging structure.

本発明の一実施形態に係る２サイクルエンジンを示す斜視図。1 is a perspective view showing a 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 本発明の効果を説明するための図。The figure for demonstrating the effect of this invention.

符号の説明Explanation of symbols

１…２サイクルエンジン、３Ａ…開口部、５Ａ…吸気ポート、６…掃気通路、８…燃焼室、９Ａ…排気ポート、１１…カバー、１５…段差部、６１…メイン通路、６２…サブ通路、１４２…案内面である第２案内面。   DESCRIPTION OF SYMBOLS 1 ... 2 cycle engine, 3A ... Opening part, 5A ... Intake port, 6 ... Scavenging passage, 8 ... Combustion chamber, 9A ... Exhaust port, 11 ... Cover, 15 ... Step part, 61 ... Main passage, 62 ... Sub passage, 142: a second guide surface which is a guide surface.

Claims (3)

掃気通路を流れる混合気が排気ポート側から吸気ポート側に向かうように燃焼室に対して略接線方向から流入する２サイクルエンジンであって、
前記掃気通路は、前記排気ポート寄りのメイン通路と、前記吸気ポート寄りのサブ通路とを備えているとともに、
前記掃気通路内の前記吸気ポート側の位置には、前記混合気を前記接線方向よりも外方側に案内する案内面が設けられ、
この案内面と前記燃焼室の内周面との間には、当該案内面で案内された混合気がぶつかる段差部が設けられ、
前記段差部は前記燃焼室と外部とを連通する開口部の内面の一部で形成され、
前記案内面は当該開口部に嵌め込まれるカバーの一部で形成されている
ことを特徴とする２サイクルエンジン。 A two-cycle engine in which an air-fuel mixture flowing in a scavenging passage flows from a substantially tangential direction to a combustion chamber so as to go from an exhaust port side to an intake port side;
The scavenging passage includes a main passage near the exhaust port and a sub-passage near the intake port,
A guide surface for guiding the air-fuel mixture to the outer side than the tangential direction is provided at a position on the intake port side in the scavenging passage,
Between this guide surface and the inner peripheral surface of the combustion chamber, there is provided a step portion where the air-fuel mixture guided by the guide surface collides ,
The step portion is formed by a part of the inner surface of the opening that communicates the combustion chamber with the outside.
The two-cycle engine, wherein the guide surface is formed by a part of a cover fitted in the opening . 請求項１に記載の２サイクルエンジンにおいて、
前記メイン通路の通路断面積と前記サブ通路の通路断面積とは、互いに異なっている
ことを特徴とする２サイクルエンジン。 The two-stroke engine according to claim 1,
2-cycle engine wherein the cross-sectional area of the main passage and the passage sectional area of said sub-passage, characterized in that there I different from each other. 請求項１または請求項２に記載の２サイクルエンジンにおいて、
先導空気通路を備えた層状掃気２サイクルエンジンである
ことを特徴とする２サイクルエンジン。 The two-cycle engine according to claim 1 or 2 ,
A two-stroke engine characterized by being a stratified scavenging two-stroke engine having a leading air passage.
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JP5054502B2 (en) * 2007-12-14 2012-10-24 ハスクバーナ・ゼノア株式会社 Scavenging cover and 2-cycle engine
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JPS60153428A (en) * 1984-01-21 1985-08-12 Nippon Clean Engine Res Stratified scavenging two-cycle internal-combustion engine
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JPS6367645A (en) * 1986-09-09 1988-03-26 Masao Kasahara Error correcting device
JPH0598974A (en) * 1991-10-07 1993-04-20 Honda Motor Co Ltd Two-cycle engine
JPH07259707A (en) * 1994-03-22 1995-10-09 Yamaha Motor Co Ltd Fuel injection method in fuel injection type two-cycle engine
JPH09222016A (en) * 1996-02-19 1997-08-26 Suzuki Motor Corp Intake device for two-cycle engine
JP4160708B2 (en) * 1999-12-27 2008-10-08 三菱重工業株式会社 Structure of scavenging passage for air-leaded stratified scavenging two-cycle engine
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