| 摘要 |
PURPOSE:To obtain a supercharge effect so as to improve the output of an engine, by continuously prpagating a compression wave, generated in an intake passage at closing and opening times of intake ports in one cylinder, to intake ports immediately befoe full closing in the other cylinder, when the two-cylinder engine of side intake port type is driven at a high speed. CONSTITUTION:When an engine is driven at a high speed, a compression wave, generated in an intake passage 18b at closing of intake ports 3a, 3b of, for instance, a cylinder 1B and at opening of the ports in the next intake stroke, is continuously propagated to intake ports 3a, 3b immediately before their full closing operated with a 180 deg. phase difference in a cylinder 1A via a passage in an adequate length set between each intake port. As a result, intake air is forced to enter a working chamber 8, and a supercharge is performed. Each compression wave, generated when intake ports of a cylinder 1A are closed and opened, is continuously propagated similarly as described to the intake ports immediately before their full closing in the cylinder 1B, thus performing supercharging. In this way, a cost down of the engine can be promoted by simplifying its construction without causing any necessity for using a supercharger or the like. |
