Fan device

Abstract

A structure that rigidly connects a shaft and a hub in a fan device with a motor, ensuring the squareness of the shaft in relation to the hub, and not worsening the flowability of the resin that constitutes the hub during injection molding, is provided. The fan device includes an approximately cylindrical hub 117 with a bottom and made of resin, vanes 118 positioned at an outer circumference of the hub 117, a shaft 113 attached to the bottom of the hub 117, and a reinforcing plate 115 for reinforcing the bottom of the hub 117. The shaft 113 is connected to the reinforcing plate 115, and a through hole 115 b filled with the resin for making the hub 117 is provided on the reinforcing plate.

What is claimed is: 
     
         1 . A fan device comprising:
 an approximately cylindrical hub with a bottom and made of a resin;   vanes positioned at an outer circumference of the hub;   a shaft attached to the bottom of the hub; and   a reinforcing plate for reinforcing the bottom of the hub;   wherein the shaft is connected to the reinforcing plate, and a through hole filled with the resin forming the hub is provided on the reinforcing plate.   
     
     
         2 . The fan device according to  claim 1 , wherein a boss part is provided at the center part of the bottom of the hub in which the boss part has a thickness in an axial direction greater than the thickness of the bottom of the hub at a position located in an outside radial direction, and the reinforcing plate is extended in a radial direction to the outside of the boss part. 
     
     
         3 . The fan device according to  claim 1 , wherein one of the surfaces of the reinforcing plate is exposed to the outside or the inside of the hub. 
     
     
         4 . The fan device according to  claim 1 , wherein a position of the through hole is used as an injection gate for forming the hub, when viewed from an axial direction. 
     
     
         5 . The fan device according to  claim 1 , wherein multiple through holes are further provided, and the multiple through holes are arranged at positions that are in point symmetry with respect to the rotation center of the shaft, when viewed from an axial direction. 
     
     
         6 . The fan device according to  claim 1 , wherein the reinforcing plate has a shape that is in point symmetry with respect to the rotation center of the shaft, when viewed from an axial direction. 
     
     
         7 . The fan device according to  claim 1 , wherein a cylindrical part that extends in an axial direction to which the shaft is fitted is provided on the reinforcing plate.