Two-stroke engine with additional pulse exhaust

Abstract

The invention provides a two-stroke engine with additional pulse exhaust to solve the problems that in the prior art, an engine is low in air exchange efficiency, large in exhaust pollutant amount andhigh in oil consumption. The two-stroke engine with additional pulse exhaust comprises primary scavenging ports, secondary scavenging ports, an exhaust port, a pulse exhaust port, a primary scavenging channel, an exhaust channel, pulse exhaust channels and auxiliary scavenging channels, the pulse exhaust channels are symmetrically arranged at two sides of the exhaust channel and gradually expandto the center of the exhaust channel, the sectional area of each pulse exhaust channel is 1.8-2.6 times of the area of the pulse exhaust port when the pulse exhaust channel is gradually expanded to the exhaust port, and negative pressure is formed through gradual expansion holes of the pulse exhaust channels and the pulse exhaust port during exhaust so that exhaust of fresh air is reduced. According to the two-stroke engine with additional pulse exhaust, the whole air exchange process is close to complete scavenging, short-circuit loss is reduced, the fuel economy and the dynamic property of the engine are effectively improved, and the emission load of tail gas pollutants such as HC is reduced.

Description

technical field [0001] The invention belongs to the field of engine equipment, and in particular relates to a two-stroke engine with additional pulse exhaust. Background technique [0002] The exhaust port and the air intake port are the key parts of the engine, which have an important impact on the performance and life of the engine. Common two-stroke engine exhaust port shapes are square, oval, round, double rectangular, double parallelogram, etc. [0003] In the prior art, the two-stroke engine realizes intake and exhaust through the ventilation process, and completes the conversion of thermal energy into mechanical energy. During the ventilation process of ordinary stroke cycle, the exhaust port has good craftsmanship, but the stroke loss is large; the tendency of the piston ring to bounce into the air port is small, and the stroke loss is small when the air port height is the same, but the original noise is large, the shape matching is poor, and the airflow guiding eff...

AI Technical Summary

Problems solved by technology

During the ventilation process of ordinary stroke cycle, the exhaust port has good craftsmanship, but the stroke loss is large; the tendency of the piston ring to bounce into the air port is small, and the stroke loss is small when the air port height is the same, but the original noise is large, the shape matching is poor, and the airflow guiding effect is small ; When exhausting in advance, the face value is small, the ventilation efficiency is poor, the loss of fresh gas is large during the ventilation process, there are many exhaust pollutants such as HC, and the fuel consumption is high

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