CS247885B1 - Two-stroke spark-ignition engine - Google Patents

Abstract

The solution concerns two-stroke petrol engine with spool valve v piston. The engine consists of the piston in which it is releasing otyor that opens a bypass slide which forms one with the connecting rod and whose position is determined position of the piston in the combustion chamber. The engine may also have auxiliary transfer channels.

Description

BACKGROUND OF THE INVENTION The invention relates to a two-stroke SI engine comprising a piston, a sluice valve and a combustion cylinder.

The known two-stroke petrol engines use transfer channels through which the mixture passes from the crank space to the working space in the combustion cylinder. The number and shape of the transfer channels depends on the bleeding system used * Ideally, a co-current bleeding with minimal mixing of the burnt gas mixture. However, this irrigation requires the complex construction of two-piston engines. An advanced flushing method is currently a return system with a flat or slightly convex piston. suction through the slide, where the suction opens directly into the crankcase. The overall cross-sectional area of the main and auxiliary channels and their relative ratio have a great influence on the entire operation of the three-channel and four-channel overflow and irrigation systems.

To achieve the highest filling efficiency, a two-stroke, petrol engine with auxiliary slide is used to control both the suction and the overflow ducts.

The aforementioned disadvantages are partially eliminated by the two-stroke SI engine consisting of a combustion cylinder, a transfer valve and a piston according to the present invention. SUMMARY OF THE INVENTION It is an object of the invention to provide a bore in the interior of the piston, wherein the long end of the connecting rod is provided with a bypass valve.

The two-stroke SI engine of the present invention allows for nearly co-current flushing at a lower initial intensity.

This will have a positive effect on the efficiency of the scavenging process, reducing fuel consumption and reducing the amount of pollutants in the exhaust gas. The main advantage

The two-stroke petrol engine according to the invention is that the so-called deaf spaces in the transfer ducts of the prior art two-stroke petrol engine structures are removed. The leakage according to the invention also has a favorable effect on the flexibility of the operation of the motor and its performance characteristics.

An exemplary embodiment of a two-stroke SI engine according to the invention is shown in the accompanying drawings, wherein FIG. 1 is a longitudinal section of the two-stroke SI engine assembly, and FIG. 2 shows the location of the bleed hole in the piston.

Example

The two stroke SI engine of a racing racing motorcycle consists of a combustion cylinder X, a piston 1 and a transfer valve 2 located on an extension of the connecting rod χ which closes the opening v in the piston 1.

Similarly to the prior art two-stroke SI engine designs, when the piston 1 moves from the bottom dead center upward, a vacuum is generated in the crank space and the air and petrol mixture from the carburetor starts to flow through the intake manifold into the crank space. The crank space is filled for as long as the piston 1 moves from the opening of the suction channel up to the top dead center and further by the inertia flowing -the mixture even at the beginning of the piston stroke χ downwards ·

As the piston 1 moves further down, the suction mixture is compressed in the crank space and the suction channel is closed. The elongated portion of the connecting rod χ pivots the overflow valve 2, thereby exposing the overflow aperture v in the piston 1, and the compressed mixture begins to flow into the combustion cylinder χ from where it expels the burnt gas residues into the exhaust duct that has in the meantime opened.

The piston 1 passes through the dead center and, when moving upwards, the bypass slide 2 closes the opening 6 in the piston 1 and then closes the exhaust duct. In the combustion cylinder χ above the piston 1. compression of the aspirated mixture takes place, and just prior to the top dead center, the compressed mixture is ignited and gradually burns. The flue gas expands and pushes the piston 1 to work.

Two-stroke petrol engine β bypass valve.2 * in piston 1 β is also provided with auxiliary bypass channels ·

Claims (1)

WAKE THIS 1 B Z U »* The two-stroke gasoline engine consists of an internal combustion cylinder, a remover of the overflow valve and a piston characterized in that an opening (4) is formed in the bottom of the piston (1) and the elongated valve (3) is provided with a overflow valve (2).