Suction and inlet device for internal combustion engine comprises two suction and inlet valves per cylinder together with swirl regulation valve unit between cylinder head and suction and inlet distributor

摘要

A branch wall area (56) divides into first and second branch suction and inlet distributor channels (14.1, 14.2) corresponding to the number of suction and inlet valves per cylinder. Independent first and second swirl regulation valve channels (12.1, 12.2) are provided within the swirl regulating valve unit (8). The cross-sectional shape of the first swirl regulation valve channel (12.1) is circular and that of the second swirl regulation valve channel (12.2) is elliptical.