| 摘要 |
PURPOSE:To aim at reducing the width of an engine in the direction of the crank shaft thereof, by providing a reed valve which limits the counterflow of mixture in an intake-air passage for supplying the mixture into a crank chamber, such that it opens and closes substantially along the axial direction of the crank shaft. CONSTITUTION:An intake-air passage 51 formed in the crankcase 34 of a two- cycle engine, is opened at its front end, directed to a crank chamber 41, and is attached at its rear end opening 53 with a carburetttor 54 together with a reed valve 55 disposed in the opening 53. In this arrangement, the reed valve 55 is so arranged that three pairs of left and right valve elements 56 having their base parts secured to both sides of the opening 53 in the axial direction of a crank shaft 42, are arranged in parallel with each other in the direction orthogonal to the axial direction of the crankshaft 42. Each pair of left and right valve elements 56 are arranged such that their both ends are made in contact together or separated from each other substantially along the axial direction of the crankshaft 42, thereby the flow of the mixture to the crank chamber 41 may be smoothly made. |
