| 摘要 |
PROBLEM TO BE SOLVED: To provide a control rod driving mechanism capable of improving torque transmission by increasing magnetic force acting between a pair of oppositely arranged magnetic coupling elements. SOLUTION: The control rod driving mechanism 3 drives a control rod 2 by transmitting a running torque of a motor 7 via the pair of oppositely arranged magnetic coupling elements 13 and 14. The outside coupling element 14 comprises an outer yoke 22 having a plurality of grooves 22a on its inner periphery side and a plurality of magnets 21 that are inserted into and magnetically adhered to the grooves 22a of the outer yoke 22, respectively. The outside coupling element 14 is disposed so that height directional dimension La of a step section 22b between the magnets 21 in the outer yoke 22 is less than half of the height directional dimension Lb of the magnets 21. COPYRIGHT: (C)2006,JPO&NCIPI
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