Exhaust gas recirculation valve

摘要

A rotation axis O2 of a shaft 3 is attached thereto with double-offset in the X and Y directions with respect to a center line O1 of a valve seat 2. A bevel process is implemented on the outer peripheral surface of a valve 1 such that the valve 1 and the valve seat 2 is line-sealed, and the sign of the angles of inclination is switched between plus and minus at two places of the outer peripheral surface of the valve 1 deviated from the center of the axis. Further, a section where the angle of inclination is constant is prepared in each of the sections connecting the two places, while the other sections are smoothly connected to each other.

主权项

1. An exhaust gas recirculation valve including:
a circular valve; a valve seat in which a circular opening that abuts against the outer peripheral surface of the valve is formed; and a shaft that rotates integrally with the valve to open and close the circular opening, wherein the valve is formed to be smoothly inclined such that the sign of the angles of inclination of outer peripheral surfaces switches between plus and minus at two places deviated, in plan view of the valve, from an axis of rotation of the shaft toward an opposite side to a center of the circular valve, and a cross-sectional side shape of the valve taken along the axis of rotation of the shaft is formed in a trapezoidal shape, and wherein the shaft is attached to a single offset position where the axis of rotation of the shaft is offset from the center of the valve toward the side of the long base of the trapezoidal shape.