| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive and small press-fitting device which can press-fit an object by applying only a small load, and can easily detect a variation in the load at the time of the press-fitting. SOLUTION: The press-fitting device is formed of: an ultra-magnetostrictor 4 for exciting a valve sheet VS to be press-fitted; an air cylinder 2 for pressing the excited valve sheet VS via the ultra-magnetostrictor 4, and press-fitting the valve sheet VS into a cylinder head CH; a driving coil 5 wound on the ultra-magnetostrictor 4, for exerting a periodically changing magnetic field on the ultra-magnetostrictor 4 to expand/contract the ultra-magnetostrictor 4; a detecting coil 6 wound on the ultra-magnetostrictor 4, for generating electromotive force, based on a variation in magnetic flux density, caused by a variation in magnetic permeability of the ultra-magnetostrictor 4 according to a press-fitted load, and a detecting circuit 8 for detecting a variation in the press-fitted load, from an output from the detecting coil. COPYRIGHT: (C)2007,JPO&INPIT
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