| 摘要 |
An engine-cooling fan is made of a synthetic resin, and includes a cylindrical hub, a plurality of fan blades provided integrally and radially on an outer peripheral wall of the hub and an integral member provided on an inner peripheral wall of the hub for mounting the fan on a drive shaft extending at a right angle relative to a plane in which the fan blades lie. At least one reinforcing rib is integrally molded between the outer peripheral wall of the hub and a heel portion of each of the blades.
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