| 摘要 |
PURPOSE:To make improvements in engine performance and exhaust capacity, by installing a storage chamber storing a part of combustion gas at more than the specified pressure, a high pressure passage connecting this storage chamber to an engine cylinder chamber and a valve device opening or closing this high pressure passage in synchronization with a speed of engine revolution. CONSTITUTION:Suction air is taken into a cylinder chamber 22 from a suction port 24 via a suction valve 26 and burned after being ignited at a spark plug 28. And, when entering the latter half of an expansion stroke where combustion ends, an opening part 31 of a high pressure passage 30 is opened by a valve device 31 whereby a part of combustion gas flows into a storage chamber 29 from the high pressure passage 30. Afterward, it enters the expansion stroke, and when an exhaust valve 27 is opened, gas inside the cylinder chamber 22 is exhausted to an exhaust port 25. Successively, when again it enters the expansion stroke from a suction stroke, the said opening part 31 is opened again. Therefore, the gas inside the storage chamber 29 is led into the cylinder chamber 22 after the suction air is taken in. Accordingly, the combustion gas is able to flow back to the cylinder chamber 22 without entailing any drop in charging efficiency of the suction air. |
