| 摘要 |
The rotor, in the embodiment depicted, comprises a rotor blank having a hub with at least one radially extending tooth, the rotor being sheathed in plastic, excepting for the hub surface areas. Throughgoing bores formed in the blank receive plugs or dowels of the plastic to secure the sheathing in place. Additionally, the periphery of the blank has an inwardly-widening groove formed therein to fix plastic sheathing also on the periphery. The rotor is formed of steel, and the plastic sheathing has a coefficient of expansion which is the same as that of the steel.
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