| 摘要 |
A dynamic balance testing machine is provided with mechanical arrangements for canceling out a free moment of an asymmetrical crank shaft and capable of accurately measuring a rotating unbalance of the asymmetrical crank shaft. A compensation rotational shaft 10 having a compensation weights 11 for canceling out a free moment of a crank shaft 5 as a test piece is provided on a vibration cradle 1 . The compensation rotational shaft 10 is rotated by a synchronous motor 9 other than a synchronous motor 8 for rotating the crank shaft 5 . The synchronous motor 9 is rotated based on a reference signal detected by an optical sensor 18 ( 13, 14 ) in such a manner that the synchronous motor 9 is synchronously rotated with the rotation of the crank shaft.
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