| 摘要 |
PROBLEM TO BE SOLVED: To provide a cooling fan with adequate strength, which is capable of assuring the necessary volume of air, for cooling an engine of a construction machine used under unfavorable conditions. SOLUTION: This cooling fan is provided with a plurality of blades 4 arranged radially around a rotary shaft, and an outside ring 5 arranged on the peripheral side of each blade 4. The number of the blades 4 is set to be 12-16, and the periphery on the discharge side of the blade 4 and the outside ring 5 are made continuous by a curved section 46 with a radius R4 (10-14 mm). The outside ring 5 is provided with a ring body section 51 in a substantially cylindrical shape, and a ring side section 52 extended toward the outside in the radial direction from both ends in the axial direction of this ring body section 51, and it is in a substantial C-shape in cross section opened to the outside in the peripheral direction. The thickness t1 of the ring side section 52 is set to be 5.5-7.5 mm. COPYRIGHT: (C)2009,JPO&INPIT
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