| 摘要 |
A final gear of a speed reducing mechanism and a magnet of a valve opening degree sensor are separately joined to a shaft, which is rotated integrally with a valve. The final gear and the magnet are arranged to satisfy at least one of thetaa>Theta-thetaswo and thetab>thetaswc, where thetaa denotes a valve open side clearance that is a circumferential gap angle circumferentially measured between the magnet and an open side end part of the final gear, thetab denotes a valve close side clearance that is a circumferential gap angle, which is circumferentially measured between the magnet and a close side end part of the final gear, Theta denotes a full open degree of the valve, thetaswo denotes a valve open sensing degree, and thetaswc denotes a valve close sensing degree.
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