| 摘要 |
As originally fabricated the rotor of the invention is a unitized structure an outer portion of which, including its outer peripheral surface, is designed to separate shortly after the start of its rotation. As illustrated, this outer peripheral portion is a ring-shaped structure which is initially incorporated by an interference fit which establishes it in a fixed bounding relation to the rotor part immediately inward thereof. At the point in time that said outer portion of the rotor is separated, guide means are rendered operative to maintain a drive coupling as between the outer and inward rotor parts and such guide means then serve as bearings accommodating the radial movement of the outer separated part in correspondence with its changing radius in response to changing speeds of rotation of the rotor. Any failure of the rotor is benign in that at such time the rotor exceeds the designed limit of its speed of rotation the outer part expands sufficient to brake against its adjacent shield or housing.
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