SU1240931A1 - Gas exchange method for twofold charge internal combustion engine - Google Patents

Description

FIELD OF THE INVENTION The invention relates to mechanical engineering, in particular to engine-building, namely to two-stroke internal combustion engines.

The purpose of the invention is to improve the effective performance of the engine.

FIG. Figure 1 shows an engine diagram illustrating the proposed method with an air compressor at the time of supplying: Fresh air, illustrating the proposed method; in fig. 2 - the same, at the time of the end of the supply of clean air from the compressor; in fig. 3 - diagram of the engine with air supply from the air line; in fig. 4 - the same, at the time of the beginning of the air supply from the air line; in fig. 5 - diagram of the engine with a turbocharger; in fig. 6 - phase diagram of the engine gas distributor.

The engine (Fig. 1 and 2) for the implementation of the proposed method contains piston 1, crank chamber 2 crankcase, inlet port 3, crankshaft 4, compressor crankshaft 5, compressor 6, compressor piston 7, compressor discharge valves 8, air channel 9 , connecting the blowing channels 10 of the engine cylinder 11 to the compressor b, the windows 12 of the blowing channels, the exhaust port 13 and the working cavity 14 of the cylinder.

In the embodiment shown in FIG. 3 and 4, the engine is additionally equipped with a valve 15 blocking the air channel 9 and a cam 16 located on the axis of the crank-cone engine mechanism for driving the valve 15.

In the embodiment shown in FIG. 5, the engine is provided with a turbo compressor 17, with which air is injected into the air duct 9.

Similarly, the method is carried out using a different type of volumetric compressor, for example a rotary gear, rotary plate or screw type.

The proposed method is carried out as follows.

When moving Porshn 1 to. In the crankcase 2 of the crankcase, a vacuum is created and, with the window 3 open, the fresh mixture is introduced into the crankcase. In the timing diagram (Fig. 6), the beginning of the intake phase is indicated by the letter O.

When the movement of the piston 1 to n. m. t. there comes a moment when its lower edge overlaps the inlet channel window 3, which corresponds to the end of the intake phase (in Fig. 6 it is indicated by the letter A). The system is set up so that at the moment the crankshaft 4 of the engine is rotated through an angle c / lj, while the crankshaft 5 of the compressor 6 rotates and takes a position determined by the angle oC that

corresponds to the position of the piston 7 of the compressor when the discharge valves open.

Through the air duct 9, which connects the purge channels 10 of the engine cylinder 11 to the compressor 6, air is supplied under pressure /, exceeding the maximum pressure of the fresh mixture in the curved chamber. Air is supplied until the top edge of the piston 1 of the windows 12 of the blowdown channels is opened, which corresponds to the beginning of the purge phase (in Fig. 6, the letter B is indicated), and the compressor piston 7 is at that moment in. mt t. (Fig. 2).

The cyclic air supply carried out under a pressure of at least 0.3 kg / cm greater than the maximum pressure in the curved chamber is selected from 0.7-1.1 of the total volume of the purge

engine channels,

With further movement of the piston 1 to n. At the moment when, with its upper edge, it first opens the exhaust port 13 and then the purge ports 12 (Fig. 2), the working cavity of the cylinder 14 of the engine is initially discharged and purged with air in the purge channels 10 and the air duct 9, and then with a fresh mixture from crank chamber 2 of the engine. By the time the fresh mixture enters the cylinder 11, an air interlayer forms between it and the exhaust gases, which prevents them from mixing and minimizes the loss of the fresh mixture into the exhaust system.

Movement in the crank chamber on

The various engine operating conditions vary from 1.1 to 1.6 kg / cm. Cycle supply of additional air volume to the purge channels, carried out under pressure exceeding the maximum

the pressure in the crank chamber increases the pressure in the crank chamber by an average of 0.15 kg / cm. It also contributes to the improvement of the process of purging the cylinder, as it reduces or eliminates the emission of exhaust gases into curvature.

camera and mixing them with fresh mix. The control of the position of the engine piston, the corresponding position of the air supply units of these pumps, which determine the beginning and end of the air supply, is carried out by a crank mechanism of the engine and driven by this mechanism to the shaft of a volumetric compressor.

The engine operates in a similar way; its circuitry is shown in FIG. 3

At the moment of overlapping the lower edge of the inlet 1 of the inlet port 3, the cam 16 runs over the valve and opens it (this is the initial moment of air supply to the channels, Fig. 3). At the moment of opening with the upper edge of the piston 1 of the purge port 12, the cam 16 escapes from the valve 15 and the latter closes (Fig. 4).

FIG. 2

FIG. 3

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Compiled by K. Dementiev

Editor M. DylynTehred I. VeresKorrektor V. But ha

Order 3468/29 Circulation 523 Subscription

VNIIPI USSR State Committee

for inventions and discoveries

113035, Moscow, Zh-35, Raushsk nab. 4/5

Branch PPP "Patent, Uzhgorod, st. Project, 4

Claims (1)

METHOD FOR GAS-EXCHANGE OF A TWO-STROKE INTERNAL COMBUSTION ENGINE by letting fresh mixture into the crank chamber through the inlet window, compressing the mixture with a piston in the crank chamber, injecting air into the purge channels and transferring the compressed mixture to the combustion chamber through the purge channel windows, for the purpose of improving which indicators, air is injected into the purge channels from the moment the piston closes the inlet window until it opens the purge channel windows, and the volume of injected air is 0.7-1.1 vol Ema purge channels. figure 1