Patent attributes
An axial-flow fan includes a boss and a plurality of blades integrally resin-molded with a hub. An axial hole of the boss has a shaft of a drive motor inserted. The axial hole is formed at an axial center of the hub. The hub includes an outer perimeter cylinder and a lid. The outer perimeter cylinder has an opening formed at the axial center, and the blades are formed so as to project from the outer perimeter cylinder. The lid extends from the outer perimeter cylinder toward the boss so as to cover the opening of the outer perimeter cylinder. The lid connects the boss and the outer perimeter cylinder together. Reinforcing ribs are integrally resin-molded together with the hub and the boss on both axial-direction sides of the lid. The reinforcing ribs reinforce the connection between the hub and the boss.
