| 摘要 |
PROBLEM TO BE SOLVED: To improve connection strength between a hub and a boss in an axial flow fan in which the boss having an axial hole into which a drive motor shaft is inserted and which is formed at the axial center of the hub and a plurality of blades are integrally resin-molded together with the hub.SOLUTION: A hub (71) of an axial flow fan (70) has an outer peripheral-side cylindrical part (72) and a cover (73). The outer peripheral-side cylindrical part (72) is formed with a plurality of blades (91) protruding from an outer peripheral edge and a part having an opening (72a) at a shaft center. The cover (73) extends from the outer peripheral-side cylindrical part (72) toward a boss (81) so as to cover the opening (72a) of the outer peripheral-side cylindrical part (72) and is a part connecting the boss (81) and the outer peripheral-side cylindrical part (72). Reinforcing ribs (74, 75) are integrally resin-molded at both axial sides of the cover (73) together with the hub (71) and the boss (81) in order to reinforce connection between the hub (71) and the boss (81). |
