| 摘要 |
PROBLEM TO BE SOLVED: To open and close a valve with low power without large driving force required for valve opening and closing even if an outer diameter of a valve holder is large. SOLUTION: A rotor shaft 41 and a valve holder 18 are connected so that they are relatively rotatable, the rotor shaft 41 relatively rotate around the valve holder 18, even when frictional resistance of the valve holder 18 and a guide hole 20 is large, the rotor 43 rotates to generate thrust to move the valve holder 18 and a valve body 16 in the valve opening/closing direction. The valve body 16 is attached to the valve holder 18 in a shiftable manner in the radial direction. COPYRIGHT: (C)2004,JPO
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