Patent ID: 7219651

Claim:
A throttle valve, mounted on a throttle shaft disposed in an intake air passage perpendicularly across a longitudinal axis of the air passage, for adjusting an amount of intake air to an internal combustion engine, said throttle valve comprising: a plurality of throttle valve components openable and closable independently of each other, each of said plurality of throttle valve components having a blocking fin provided integrally on a downstream-side of the throttle valve component, wherein said plurality of throttle valve components form a main air intake port for causing air to flow in the intake air passage along the longitudinal axis of the air passage and an auxiliary air intake port for causing air to flow in the intake air passage substantially perpendicularly across the longitudinal axis of the air passage, each blocking fin blocking a part of the auxiliary air intake port formed at a downstream-side region of a boundary between said plurality of throttle valve components when at least one of said plurality of throttle valve components is opened.