ELECTROMAGNETIC DRIVING DEVICE FOR VALVE

摘要

PROBLEM TO BE SOLVED: To increase the attracting force without enlarging the outer diameter when increasing the magnetic flux so as to increase the attracting force while using the same material in a conventional electromagnetic driving device for a valve with the structure of both of a movable iron core and an end surface of the electromagnetic coil iron core opposite to the movable iron core formed into a plane. SOLUTION: A first and a second electromagnets 112 and 114 are arranged in around the extension line of a valve shaft 5a so as to be opposite to each other in their back surfaces through a spacer 81. The first and the second electromagnetic 112 and 114 respectively have outer cylinders 12a and 14a and inner cylinders 12b and 14b, and have opening parts 12c and 14c between the inner cylinders and the outer cylinders. Dick-like movable iron cores 16 and 18 connected to each other are arranged opposite to the openings. A bearing member 11 for supporting the connecting shaft 19 is passed through the first and the second electromagnets 112 and 114 for fixation.