| 摘要 |
PROBLEM TO BE SOLVED: To prevent collision sound from occurring and the waveforms of vibrations from being affected by collision, by providing such a structure as to prevent a retainer from colliding with an end part of an outer cylindrical case in a vibration testing system. SOLUTION: A bearing part 30 is constituted of the approximately cylindrical outer case 31 fixed to the inner circumferential surface of an inner cylinder part 28, a shaft 32 arranged in the outer cylindrical case 31 and having a tip connected and fixed to a movable body 40, a plurality of balls 33 rotation-freely in point contact with both the outer circumferential surface of the shaft 32 and the inner circumferential surface of the outer cylindrical case 31, the retainer 34 for separately holding the balls 33, and a compression coil spring 35 interposed between the end surfaces of the retainer 34 and the inner surfaces of end parts 31a of the outer cylindrical case 31. Since the retainer 34 is neutrally held by the compression coil spring 35 at all times, the retainer 34 does not collide with the end parts 31a of the outer cylindrical case 31 to generate collision sound as before and therefore does not affect oscillation waveforms. COPYRIGHT: (C)2005,JPO&NCIPI
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