Novel two-stroke internal combustion engine

Abstract

The invention discloses a novel two-stroke internal combustion engine. The novel two-stroke internal combustion engine is characterized in that an inlet casing (1) is provided with an inlet casing piston (3), and an exhaust casing (2) is provided with an exhaust casing piston (4); the inlet casing piston (3) is connected with a crankshaft (9) through an inlet casing connecting rod (5) and an inlet casing crank throw (7) in sequence, and the exhaust casing piston (4) is connected with the crankshaft (9) through an exhaust casing connecting rod (6) and an exhaust casing crank throw (8) in sequence; one end of the inlet casing (1) and one end of the exhaust casing (2) are each provided with an end cap (10); air inlets (11) and exhaust holes (12) are formed in the casing walls of the inlet casing (1) and the exhaust casing (2) correspondingly; communicating cavities (13) used as a part of combustion chamber are arranged between the inlet casing (1) and the end cap (10) and the exhaust casing (2) and the end cap (10); and an included angle alpha which is an acute angle is formed between the inlet casing crank throw (7) and the exhaust casing crank throw (8). The structure of a traditional two-stroke internal combustion engine is simplified, the pressure in a combustion cavity is increased, and the combustion efficiency of fuel oil is further improved.

Description

[0001] Technical field: [0002] The invention relates to an internal combustion engine, more specifically a two-stroke internal combustion engine. [0003] Background technique: [0004] Internal combustion engines have been used for many years. There are many types or structures of two-stroke internal combustion engines. There are two typical structures. One is to open an air inlet (or exhaust port) on the cylinder wall. The opening and closing of the air port is driven by the crankshaft. To control the reciprocating motion, the exhaust (or intake) valve is provided on the cylinder head, and the opening and closing of the valve is controlled by the valve timing mechanism; The exhaust port, the intake port and the exhaust port are all opened and closed by the up and down movement of the piston driven by the crankshaft. The two-stroke internal-combustion engine of the first kind of structure needs valve and valve timing device as existing four-stroke internal-combustion engine...

AI Technical Summary

Problems solved by technology

The two-stroke internal-combustion engine of the first kind of structure needs valve and valve timing device as existing four-stroke internal-combustion engine, so structure is comparatively complicated, and manufacturing cost is high, and simultaneously because of the existence of valve, valve will be opposite to intake (or exhaust) Cause resistance, affect the efficiency of intake and exhaust; the structure of the second type of two-stroke internal combustion engine is relatively simple, but the internal combustion engine of this structure must make the exhaust gas pressure in the cylinder lower than the intake pressure when intake air, so the exhaust gas The position of the gas port on the cylinder wall must be higher than the position of the intake port. At this time, when the piston descends, it first passes through the exhaust port. When the exhaust port is partially opened, the exhaust gas with high pressure will quickly pass through the opened part. The exhaust port discharges the cylinder, and the pressure in the cylinder drops rapidly. When the piston reaches the air inlet, the air inlet is opened, and fresh air (or mixed gas) with a certain pressure is charged into the cylinder and the remaining exhaust gas is blown out of the cylinder; when the piston starts to move upward When the air intake is lower than the exhaust port, the piston closes the air intake first. When the air intake is completely closed by the piston, the exhaust port is not completely closed because part of the exhaust port is higher than the air intake. , the gas above the atmospheric pressure in the cylinder will still be discharged from the exhaust port, which reduces the amount of air that can be compressed. Only when the exhaust port is completely closed, the air in the cylinder is compressed under the movement of the piston. Make the pressure of the compressed air less than the desired pressure

Therefore, the energy utilization efficiency of the two-stroke internal combustion engines of the above two structures is not high, and there is a defect of insufficient combustion efficiency. How to improve the combustion efficiency of the two-stroke internal combustion engines is a long-term unresolved problem, which makes the advantage of simple structure unable to be brought into play come out

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