CORRESPONDENCE TO MIRROR CYCLE IN TIME OF HAVING ROTARY VALVE USED IN FOUR-CYCLE GASOLINE ENGINE

摘要

PURPOSE: To prevent any reverse flow to a carburetor of a mixer from occurring by installing this mixer and both air exclusive intake and exhaust ports, and in time of a series of processes up to intake air, compression and expansion, setting up an air port due to both up and down motions of a piston by means of a crankshaft at angle in the specified range. CONSTITUTION: An intake port and an exhaust port 7 for mixture exclusive use in a combustion chamber are installed, and further an air port 8 opening simultaneously with the mixture exclusive intake port or somewhere little later in time of an intake process of air-fuel mixture, and rotating a crankshaft as far as 135 degrees from 30 degrees out of the bottom dead center even getting into a compression process, and being opened till a piston 11 goes up. Likewise, an air exclusive intake port 9 rotating the crankshaft as far as 160 degrees from 50 degrees out of the top dead center in time of an expansion process and opening while the piston 11 goes down, then closing at the bottom dead center, is installed as well. With this constitution, any possible flowing backward of the mixture to a carburetor is preventable, so the rate of a ratio of compression ratio expansion ratio can be taken higher insofar as possible.