Patent ID: 7225792
Filing Date: 2007-06-05
Classification: F02D,F16K

Abstract:
1. A valve device for an internal combustion engine, comprising: a housing which defines an air passage communicating with a cylinder of the internal combustion engine; a valve which is rotatably accommodated in the air passage; a shaft which holds the valve; and two bearing members which respectively slideably support two axial end portions of the shaft, wherein at least one of the valve and the shaft has two diameter-enlarged portions and two taper portions, the two diameter-enlarged portions being respectively arranged at two axial end portions thereof with respect to an axially intermediate portion thereof, the two axial end portions being respectively disposed at sides of the bearing members, the diameter-enlarged portion having a larger outer diameter than that of the axially intermediate portion, each of the two taper portions having an outer diameter which gradually increases from a side of the axially intermediate portion toward a side of the diameter-enlarged portion.