| 摘要 |
PROBLEM TO BE SOLVED: To improve joining force in a ring in a fan for cooling a radiator mounted on a vehicle. SOLUTION: In this fan 10, since a padding part 22 is arranged in the peripheral direction between a boss 19 of connecting a plurality of blades 20 arranged on the outer periphery 19a of the boss 19 and the blades 20 of a concentrically circular ring 21, resin flows not only to both sides in the peripheral direction but also in the direction of the padding part 22 in a part without arranging the blades 20 of the ring 21 in a cavity in injection molding, and a weld line is hardly caused. Even when the weld line is caused, the cross-sectional area is increased. Thus, the joining force of the ring 21 can be improved. COPYRIGHT: (C)2009,JPO&INPIT
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