| 摘要 |
The air-injection device comprises a round pipe rotatably mounted in a round hole seat adjacent to the exhausting port on the cylinder block of a two-stroke engine. The round hole seat has two passages in communication with the exhausting port and the crankcase. The round pipe has a slot, which can align with the two passages respectively upon the round pipe rotating. The inside of the round pipe is fed with compressed air, therefore, the compressed air blowing towards the exhausting port during the later period of exhausting forms a screen to prevent the fresh gas from flowing out together with the waste gas exhausted or even reversely inject iar into the cylinder for increasing the gas pressure in the cylinder. Upon the ending of gas feeding into the crankcase, additional air is injected in there to increase the pressure in the crankcase. |
