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JP3131655U - Two-stroke engine piston - Google Patents

Two-stroke engine piston Download PDF

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Publication number
JP3131655U
JP3131655U JP2007001227U JP2007001227U JP3131655U JP 3131655 U JP3131655 U JP 3131655U JP 2007001227 U JP2007001227 U JP 2007001227U JP 2007001227 U JP2007001227 U JP 2007001227U JP 3131655 U JP3131655 U JP 3131655U
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piston
stroke engine
scavenging
scavenging port
gas
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知機 山崎
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知機 山崎
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Abstract

【課題】二行程エンジンのピストンに関し、燃料ガスを無駄にすることなく、９５％の掃気効果が実現できるという二行程エンジンのピストンを提供する。
【解決手段】ピストン上部の掃気口に対向する箇所に円形の障壁を形成して、掃気口から吹き出す混合ガスまたは空気を垂直に筒頂部に吹き上げるようにして排気ガスだけを排出させるようにした二行程エンジンのピストンとした。
【選択図】図３A piston for a two-stroke engine is provided that can achieve a scavenging effect of 95% without wasting fuel gas.
A circular barrier is formed at a location facing the scavenging port on the upper part of the piston, and only exhaust gas is discharged by blowing a mixed gas or air blown from the scavenging port vertically to the top of the cylinder. The stroke engine piston.
[Selection] Figure 3

Description

本考案は、二行程エンジンのピストンに関し、特に、掃気機構についてのものである。   The present invention relates to a piston for a two-stroke engine, and more particularly to a scavenging mechanism.

従来の二行程エンジンでは、通常運転で約６５％、アイドリングで２５％した排気ガスの掃気ができず、それぞれ３５％と７５％の燃料ガスが無駄に排気されていた。
特開平１０−２５２４７９号公報 In the conventional two-stroke engine, the exhaust gas of about 65% in the normal operation and 25% in the idling cannot be scavenged, and 35% and 75% of the fuel gas are exhausted wastefully.
JP-A-10-252479

本考案では、上記のように燃料ガスを無駄にすることなく、９５％の掃気効果が実現できるというものである。   In the present invention, a scavenging effect of 95% can be realized without wasting fuel gas as described above.

上記の事情に鑑み、本考案は、燃料ガスを無駄にすることなく、９５％の掃気効果を実現すべく、ピストン上部の掃気口に対向する箇所に円形の障壁を形成して、掃気口から吹き出す混合ガスまたは空気を垂直に筒頂部に吹き上げるようにして排気ガスだけを排出させるようにした二行程エンジンのピストンとした。   In view of the above circumstances, in order to achieve a scavenging effect of 95% without wasting fuel gas, the present invention forms a circular barrier at a location facing the scavenging port at the top of the piston, and from the scavenging port. A piston of a two-stroke engine in which only the exhaust gas is discharged by blowing up the mixed gas or air to be blown vertically to the top of the cylinder.

また、本考案は、燃料ガスを無駄にすることなく、９５％の掃気効果を実現すべく、ピストン上部の掃気口に対向する箇所に円形の障壁を形成し、前記障壁の掃気口側に凹部を凹設して、掃気口から吹き出す混合ガスまたは空気を垂直に筒頂部に吹き上げるようにして排気ガスだけを排出させるようした二行程エンジンのピストンとした。   In addition, the present invention forms a circular barrier at a location facing the scavenging port on the upper part of the piston and realizes a scavenging effect of 95% without wasting fuel gas, and a recess is formed on the scavenging port side of the barrier. The piston of the two-stroke engine in which only the exhaust gas is discharged by vertically blowing the mixed gas or air blown from the scavenging port to the top of the cylinder.

本考案は、ピストン上部の掃気口に対向する箇所に円形の障壁を形成して、掃気口から吹き出す混合ガスまたは空気を垂直に筒頂部に吹き上げるようにして排気ガスだけを排出させるようにした二行程エンジンのピストンとしたので、燃料ガスを無駄にすることなく、９５％の掃気効果を実現することができる。   In the present invention, a circular barrier is formed at a position facing the scavenging port on the upper part of the piston, and the exhaust gas alone is discharged by blowing the mixed gas or air blown from the scavenging port vertically to the top of the cylinder. Since the piston of the stroke engine is used, a scavenging effect of 95% can be realized without wasting fuel gas.

また、本考案は、ピストン上部の掃気口に対向する箇所に円形の障壁を形成し、前記障壁の掃気口側に凹部を凹設して、掃気口から吹き出す混合ガスまたは空気を垂直に筒頂部に吹き上げるようにして排気ガスだけを排出させるようした二行程エンジンのピストンとしたので、燃料ガスを無駄にすることなく、９５％の掃気効果を実現することができる。   Further, the present invention forms a circular barrier at a location facing the scavenging port on the upper part of the piston, and a concave portion is formed on the scavenging port side of the barrier so that the mixed gas or air blown from the scavenging port is vertically Since the piston of the two-stroke engine exhausts only the exhaust gas by blowing it up, the scavenging effect of 95% can be realized without wasting fuel gas.

本考案を添付する図面の具体的な実施例に基づいて、以下詳細に説明する。   Hereinafter, the present invention will be described in detail with reference to specific embodiments of the accompanying drawings.

図１は二行程エンジンの掃気行程を説明する二行程エンジンの縦断面図、図２は二行程エンジンの掃気行程を説明する二行程エンジンの縦断面図、図３は二行程エンジンの掃気行程を説明する二行程エンジンの縦断面図、図４は本考案のピストンと掃気口の平面図、図５は本考案のピストンと掃気口の平面図である。   FIG. 1 is a longitudinal sectional view of a two-stroke engine explaining a scavenging stroke of the two-stroke engine, FIG. 2 is a longitudinal sectional view of a two-stroke engine explaining a scavenging stroke of the two-stroke engine, and FIG. 3 is a scavenging stroke of the two-stroke engine. FIG. 4 is a plan view of the piston and the scavenging port of the present invention, and FIG. 5 is a plan view of the piston and the scavenging port of the present invention.

二行程エンジンの掃気方法は、図１に示すように、ピストン１の降下と共に排気口２が開き、排気ガス流３が排出される。すぐ後で掃気口４が開き、クランク室より送り込まれた燃料と空気の混合気体５がシリンダー１６に送り込まれる。図１のように既燃焼の排気ガスがシリンダー内でうまく回転しながら掃気されると良いが、実際には図２に示すように、一部の未燃焼の混合気体５が掃気口４から排気口２に直行してしまい、著しい燃料の無駄になるばかりでなく、出力不足や大気汚染の原因ともなっている。   In the scavenging method of the two-stroke engine, as shown in FIG. 1, the exhaust port 2 opens and the exhaust gas flow 3 is discharged as the piston 1 descends. Immediately after that, the scavenging port 4 opens, and the mixed gas 5 of fuel and air sent from the crank chamber is sent to the cylinder 16. As shown in FIG. 1, it is preferable that the burnt exhaust gas is scavenged while rotating well in the cylinder. In practice, however, a part of the unburned mixed gas 5 is exhausted from the scavenging port 4 as shown in FIG. It goes straight to the mouth 2 and not only wastes significant fuel, but also causes output shortage and air pollution.

本考案では、図３、図４、図５に示すように、ピストン１の上面に半円形の障壁６を掃気口４の前面に設け、掃気口４より吹き出してくる混合ガス８を障壁６に当てることによって、直角に向きを変えさせて、混合ガス流９のように垂直に筒頂に向けて吹き上げさせ、排気ガス口１０に遠いところに向けて未燃焼混合ガスが既燃焼排気ガスを押し下げるように仕向けることによって、排気ガスの排出効率を高める。排気口が２〜３箇所にある時は同じような障壁を設け、圧縮率を高める必要のある場合はこの障壁内に凹部７を凹設してピストン上部を高くすることによって、より効率を高めることができる。   In the present invention, as shown in FIGS. 3, 4, and 5, a semicircular barrier 6 is provided on the front surface of the scavenging port 4 on the upper surface of the piston 1, and the mixed gas 8 blown out from the scavenging port 4 is formed in the barrier 6. By applying the gas, the direction is changed at right angles, and the gas is blown up vertically toward the top of the cylinder like the mixed gas flow 9, and the unburned mixed gas pushes down the burned exhaust gas toward a position far from the exhaust gas port 10. As a result, exhaust gas exhaust efficiency is increased. When there are two or three exhaust ports, a similar barrier is provided, and when it is necessary to increase the compression ratio, the concave portion 7 is provided in the barrier to raise the upper portion of the piston, thereby increasing the efficiency. be able to.

本考案は、ピストン上部の掃気口に対向する箇所に円形の障壁を形成して、掃気口から吹き出す混合ガスまたは空気を垂直に筒頂部に吹き上げるようにして排気ガスだけを排出させるようにした二行程エンジンのピストンであるが、二行程ディーゼルエンジンのピストンにも利用が可能である。   In the present invention, a circular barrier is formed at a position facing the scavenging port on the upper part of the piston, and the exhaust gas alone is discharged by blowing the mixed gas or air blown from the scavenging port vertically to the top of the cylinder. Although it is a piston for a stroke engine, it can also be used for a piston for a two-stroke diesel engine.

二行程エンジンの掃気行程を説明する二行程エンジンの縦断面図である。It is a longitudinal cross-sectional view of the two stroke engine explaining the scavenging stroke of the two stroke engine. 二行程エンジンの掃気行程を説明する二行程エンジンの縦断面図である。It is a longitudinal cross-sectional view of the two stroke engine explaining the scavenging stroke of the two stroke engine. 本考案の二行程エンジンの掃気行程を説明する二行程エンジンの縦断面図である。It is a longitudinal cross-sectional view of the two stroke engine explaining the scavenging stroke of the two stroke engine of the present invention. 本考案のピストンと掃気口の平面図である。It is a top view of the piston and scavenging port of the present invention. 本考案のピストンと掃気口の平面図である。It is a top view of the piston and scavenging port of the present invention.

符号の説明Explanation of symbols

１…ピストン
４…掃気口
６…障壁
９…混合ガス流（混合ガスの例）
７…凹部 DESCRIPTION OF SYMBOLS 1 ... Piston 4 ... Scavenging port 6 ... Barrier 9 ... Mixed gas flow (example of mixed gas)
7 ... recess

Claims (2)

ピストン上部の掃気口に対向する箇所に円形の障壁を形成して、掃気口から吹き出す混合ガスまたは空気を垂直に筒頂部に吹き上げるようにして排気ガスだけを排出させるようにしたことを特徴とする二行程エンジンのピストン。   A circular barrier is formed at a location facing the scavenging port on the upper part of the piston, and only the exhaust gas is discharged by blowing the mixed gas or air blown from the scavenging port vertically to the top of the cylinder. Two-stroke engine piston. ピストン上部の掃気口に対向する箇所に円形の障壁を形成し、前記障壁の掃気口側に凹部を凹設して、掃気口から吹き出す混合ガスまたは空気を垂直に筒頂部に吹き上げるようにして排気ガスだけを排出させるようしたことを特徴とする二行程エンジンのピストン。   A circular barrier is formed at a location facing the scavenging port on the upper part of the piston, and a recess is formed on the scavenging port side of the barrier so that the mixed gas or air blown from the scavenging port is blown up vertically to the top of the cylinder. A two-stroke engine piston characterized by exhausting only gas.
JP2007001227U 2007-02-27 2007-02-27 Two-stroke engine piston Expired - Fee Related JP3131655U (en)

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JP2007001227U JP3131655U (en) 2007-02-27 2007-02-27 Two-stroke engine piston

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