Two-stroke engine capable of scavenging in air pilot mode

Abstract

The invention discloses a two-stroke engine capable of scavenging in an air pilot mode, which is characterized in that a cylinder is symmetrically provided with a closed-structure scavenging duct; the structure is realized by symmetrically arranging side covers on two sides of the cylinder; one side of the scavenging duct of the cylinder is connected with an air storage cavity; one check valve combination is positioned between the air storage cavity and an admission pipe; a carburettor and the admission pipe are respectively provided with two relatively-independent inlet paths; a case is provided with a case scavenging duct; the case scavenging duct causes a crank chamber to be communicated with a cylinder scavenging duct by the main bearing ball gap of a crank case; flammable mixed gas in the crank chamber is fully mixed when passing through a bearing hole ball which rotates at high speed and is burnt more fully; and fresh air in the air storage chamber is pressed into the cylinder by the pre-compressed flammable mixed gas when scavenging to scavenge firstly. The two-stroke engine can improve fuel pulverization, improves combustion efficiency, effectively lowers harmful ingredients, such as HC, CO and the like in tail gas, and improves the economical efficiency of the engine.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to an air-guided small general-purpose two-stroke engine for scavenging. Background technique [0002] Two-stroke engines are widely used in many product fields such as agriculture, forestry, gardening, and households due to their remarkable advantages such as compact structure, small size, light weight, and fast operation speed. The two-stroke engine is composed of cylinder block, piston, crankshaft connecting rod, magneto, carburetor and other components. Air intake, exhaust port and scavenging port are set on the body of the cylinder block. Run to turn on or off. [0003] A working cycle of the engine is completed by two strokes of the piston movement. When the piston rises, it begins to compress the working mixture, and at the same time, a vacuum is formed in the crank chamber below the piston. Under the action of atmospheric pressure, the combustible mixture enters the crank ...

AI Technical Summary

Problems solved by technology

However, the fresh combustible mixture used for scavenging is easy to mix with the burned exhaust gas, so that this part of the combustible mixture is discharged without being burned, so the two-stroke engine is not only more fuel-efficient than the four-stroke engine. Poor, and the exhaust gas contains a lot of harmful components (such as HC and CO)

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