A scavenging system for a two-stroke engine

Abstract

The invention discloses a scavenging system of a two-stroke engine. The system comprises a cylinder provided with a combustion acting chamber, a crankshaft box provided with a crankshaft chamber, a piston and a crankshaft assembly, wherein a fresh mixed air inlet and an exhausting port are formed in the cylinder; a thick mixed air scavenging channel and a thin mixed air scavenging channel are arranged in the crankshaft chamber; the thick mixed air scavenging channel is provided with a first air inlet and a first air outlet; the thin mixed air scavenging channel is provided with a second air inlet and a second air outlet; the thick mixed air scavenging channel and the thin mixed air scavenging channel are arc-shaped and clung to the inner walls of two sides of the crankshaft chamber; a first scavenging port and a second scavenging port are formed in the combustion acting chamber; the first scavenging port is far away from the exhausting port and communicates with the first air outlet; the second scavenging port is close to the exhausting port and communicates with the second exhausting port; a first oil stopping rib and a second oil stopping rib are correspondingly arranged on the thick mixed air scavenging channel and the thin mixed air scavenging channel. According to the system, a layered scavenging state can be formed, so that the content of harmful components in exhaust gas can be reduced, and as a result, the environment can be protected; the consumption of oil in use can be saved.

Description

technical field [0001] The invention relates to a two-stroke engine, in particular to a scavenging system of the two-stroke engine. Background technique [0002] Two-stroke engines are usually used in portable power tools such as brush cutters and gasoline chain saws, which mainly include cylinders, pistons matched with cylinders, crankcases, and crankshaft assemblies supported on the crankcases by bearings, so that the piston top and The cylinder cavity forms a combustion working chamber, and the inside of the piston and the crankcase cavity form a crank chamber. Generally, an air inlet, an exhaust port, and a scavenging port are arranged on the cylinder, and these air ports are controlled to be opened or closed by the piston. One working cycle of the engine is completed by one revolution of the crankshaft, that is, two strokes of the piston up and down. [0003] During the upward stroke of the piston, the air-fuel mixture is sucked from the intake port into the crank cha...

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Problems solved by technology

[0004] The present invention aims at the disadvantages existing in the prior art that fresh air-fuel mixture gas is easily mixed with burned exhaust gas to be discharged out during the scavenging process, resulting in a large amount of harmful components in the tail gas of a two-stroke internal combustion engine, etc., and provides a new Scavenging system for two-stroke engines

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