| 摘要 |
PROBLEM TO BE SOLVED: To improve the balance performance. SOLUTION: In this rotational balance correcting device 8, since a sphere body 18 is moved in the direction to keep balance along a U shaped groove 20 in longitudinal section formed in the annular outer peripheral side inner wall surface 19 of the wall surface within a hollow passage without coming into contact with the bottom surface within a hollow passage 17, the sphere body comes into contact with two points of an opening corner part to roll, sliding friction with the lower surface by the conventional rolling of the sphere body 18 is not generated, and the sphere body 18 is smoothly moved in the balance direction. Also, since the annular outer periphery side inner wall surface 19 of the wall surface within the hollow passage is composed of a hard material, point contact is enough to come into contact with the sphere body 18, the balance movement of the sphere body 18 becomes smoother compared with the case of conventional surface contact between a soft damping material and the sphere body, and whereby the balance performance can be more improved.
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