SU878989A1 - Two-stroke i.c.engine crank-chamber blowing through - Google Patents

Description

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The invention relates to the field of mechanical engineering, in particular, engine-building, namely to two-stroke internal combustion engines with a crank-type chamber purge.

Known two-stroke internal combustion engines with a crank-chamber purge, containing at least one cylinder connected to the carburetor nozzle through the crankcase and provided with 10 at least one outlet window, a cylinder head and a piston, equipped with a visor with a hole 1 adjacent to the cylinder wall.

In such engines, the cylinder is purged and filled with fresh charge, compressed by the back side of the piston in the crank chamber and fed into the cylinder through the purge channel and the holes in the piston visor. The result is-. 20 th with sufficient structural simplicity of the engine achieved high specific power performance.

However, in known engines, no measures are taken to afterburner 95 that had burned in the engine cylinder fuel, which leads to increased toxicity of exhaust gases.

The aim of the invention is to reduce the toxicity of exhaust gases.

The goal is achieved by the fact that the cylinder is additionally equipped with a receiver pipe connected to the cylinder through a hole placed under the outlet window at the level of the hole in the piston visor when it is located at the bottom dead center, and to the crankcase through the hole located under the carburetor pipe.

FIG. 1 shows a diagram of the described engine; in fig. 2 - engine operation phases: a - free exhaust phase; b - phase of exhaust and intake of exhaust gases in the pipeline receiver; in the phase of the intake of exhaust gases in the pipeline receiver; g - phase of the intake of exhaust gases into the engine crankcase; in fig. 3 - indicator diagram of the described engine.

In the cylinder 1 (Fig. 1), equipped with a head 2, a piston 3 is placed with a visor in which an opening 4 is made. The cylinder 1 is connected to the cylinder 1 through a crankcase 5 a receiver pipe 6. It is connected to the cylinder 1 through an opening 8 located under an outlet window 9 at the level of the hole 4 in the visor of the piston 3 when the latter is in the bottom dead center, and through the hole 10 to the crankcase 5. The hole 10 is located under the carburetor nozzle 6. The fresh bypass of the crankcase 5 passes into the cylinder 1 through the purge channel (not shown on drawings en) connected to the cylinder through window 11.

Works proposed engine as follows.

At the end of the expansion process (Fig. 2a), when the piston moves to the bottom dead center during the period of alignment of the orifice 4 in the visor of the piston with the exhaust port 9, there is a free release of exhaust gases. Upon further movement (Fig. 26) of the piston to the bottom dead center, an orifice 4 in the visor of the piston communicates the working chamber of the cylinder simultaneously with the outlet window 9 and the orifice 8 of the receiver pipe 7, and the piston 3 opens the purge port 11. At the same time, purge and the release of exhaust gases through the exhaust port 9 and the intake of exhaust gases through the opening 8 into the pipeline receiver. When the piston 3 is in the bottom dead center, its visor closes the outlet port 9, and the visor 4 opening is aligned with the receiver pipeline outlet 8. During this period, the pipeline-receiver 7 continues to be filled with exhaust gases and fresh mixture entering through the purge port 11 into the cylinder 1. When the piston 3 moves to the upper dead center (Fig. 2d), the indicated sequence of engine operation repeats. When the piston 3 is opened by the skirt 3, the receiver 10 of the receiver pipe 7 communicates with the crankcase 5 and the exhaust gases and fresh mixture that contain a significant portion of unburned fuel rush into the crankcase 7, and then blow the cylinder along with the fresh mixture. in the cylinder.

The effect of the bypass part of the exhaust gases in the cylinder described engine

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The figure is illustrated by the indicator diagram (Fig. 3).

When exhaust gases are released without transferring their parts back to the cylinder, the latter communicates with the atmosphere during the piston stroke from point / to d and from i / to e. When bypassing a part of the combustion products and fresh mixture (fdh), the emission of fresh mixture will decrease and pollution will decrease the environment.

Thus, the use of the described engine will allow part of the exhaust gases and fresh mixture to be returned via the receiver pipeline, which serves as a storage device, back into the cylinder, resulting in a reduction in fresh mixture losses and environmental pollution.

Claims (1)

Invention Formula Two-stroke internal combustion engine with a crank-chamber purge, containing at least one cylinder connected to the carburetor nozzle through the crankcase and provided with at least one exhaust window, cylinder head and piston, equipped with a bore adjacent to the cylinder wall, characterized in that , in order to reduce toxicity, the cylinder is additionally equipped with a receiver pipe connected to the cylinder through an opening placed under the outlet window at the level of the opening in the visor of the vessel when it is about the position in the bottom dead center, and to the crankcase through a hole located under the carburetor nozzle. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 370352, cl. F 02B 25/14, 1973. 7 JO