| 摘要 |
<p>A reed valve assembly (11) is mounted in a valve chamber (10) formed in an intake passage of a crankcase (2) of a two-stroke cycle engine and the reed valve assembly (11) comprises a box-shaped valve body (12) having a base end opened and secured to an intake pipe (9) and a front end converging towards the crankcase (2), the valve body (12) being provided with valve openings (13) formed to side surfaces of the valve body (12), and reed valves (14) resiliently provided for the valve openings (13). The valve chamber (10) has opposing inner wall surfaces (10a) gently curved outwardly for forming expanded portions between the side surfaces of the valve body and the expanded surfaces (17) of the valve chamber. The curved surfaces of the inner wall surfaces of the valve body converge towards an interior of the crankcase with an inclination of about 10 to 20 degrees and a maximum lateral width of each of the expanded portions (17) is defined to about 5 to 10 mm. <IMAGE></p> |
