| 摘要 |
PROBLEM TO BE SOLVED: To provide an intake system of an internal combustion engine capable of achieving optimization of a combustion efficiency, in which strong vortex tumble flows are generated in a low-load state and intake air flowing through an upper passage is suppressed in a medium to high load state so as to control the strength of tumble vortex flows.SOLUTION: In the intake system of an internal combustion engine, an intake distribution valve (65) is constructed by integrally expanding a plate-like valve body (67) from a rotation shaft (66), which directs a rotation center (Cv) of the rotation shaft (66)in parallel with an upstream edge (61aa) of a partition plate (60) and locates the rotation center (Cv) in the lower vicinity of the upstream edge (61aa), and the rotation shaft (66) is rotatably journaled on an inlet pipe (20), so that during low-load operation of the internal combustion engine, the intake distribution valve (65) is closed with the plate-like valve body (67) or an upstream side opening of a lower intake passage (Lp) is closed with the plate-like valve body (67) and the rotation shaft (66). |
