Patent ID: 8052118
Filing Date: 2011-11-08
Classification: F02B,F02D,F16K,Y02T,Y10T

Abstract:
1. An intake control device for an internal combustion engine comprising: (a) a housing having an intake passage communicated with a combustion chamber of the internal combustion engine; (b) a valve housed in the housing for opening and closing the intake passage; and (c) a shaft for varying an opening degree of the valve, wherein: the valve has a through hole in which the shaft is inserted to penetrate through in an axial direction of rotation thereof, and a tubular valve shaft part so arranged as to surround a periphery of the through hole; the through hole includes a fitting hole formed in a polygonal shape in which the shaft is press-fitted; the shaft includes a fitting part having a polygonal shape including at least four flat surface portions, the fitting part being fitted to and held on wall surfaces of the fitting hole through the four flat surface portions; and the through hole has protruded ribs on first and second two wall surfaces of the fitting hole opposed to the neighboring first and second two flat surface portions of the four flat surface portions of the shaft, the protruded ribs extending in the axial direction of rotation of the shaft, and has flat surface portions formed on third and fourth two wall surfaces of the fitting hole opposed to the neighboring third and fourth two flat surface portions of the four flat surface portions of the shaft, the flat surface portions extending in the axial direction of rotation of the shaft.