| 摘要 |
An inner rigid pulley core is formed from a plurality of plate members extending radially from a centrally disposed shaft; or a predetermined axis of rotation at which the plate members meet and are connected together in the absence of a shaft. A cylindrical pulley shell is secured to the free ends of the plate members to form with the rigid pulley core a pulley with a face which in total acts as a beam (composite type). In one of the embodiments, where the radial plates are secured to each other, about the predetermined axis of rotation, the axial ends of the plates are extended near the axis of rotation on each end of the pulley to form ears about which an annular ring is secured to form shaft ends to facilitate mounting of the pulley. In another embodiment (where the plates are secured together about the axis of rotation) a cast end bell with stub shaft ends is secured to the pulley core and shell to facilitate mounting of the pulley. In yet another embodiment the rigid pulley core and shell are formed by casting concrete about a shaft having welding lugs radially extending therefrom along a predetermined extent of the shaft length, and reinforcing bars or plates are disposed proximate the periphery thereof.
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