AXIAL FLOW FAN

PROBLEM TO BE SOLVED: To provide an axial flow fan capable of shortening a cooling time for a resin injection molding.SOLUTION: This invention relates to an axial flow fan 24 in which several blades 125 are formed at an outer peripheral surface of a substantial cylindrical hub 124 by a resin integral molding process. When a front side edge line in a rotating direction is defined as a front edge 127 and a rear edge line is defined as a rear edge 128, a direction of flowing-in air is defined as an upstream and a direction of going-out air is defined as a downstream, the blade 125 is held by an outer peripheral surface of the hub 124 and the substantial cylindrical upstream side end 132, and the substantial cylindrical hub 124 having a specified plate thickness is formed with a recess 135 that is recessed at a side of the rotating shaft at a part corresponding to the front edge 127 of the blade 125.SELECTED DRAWING: Figure 2 【課題】樹脂射出成型の冷却時間を短縮することができる軸流ファンを提供する。【解決手段】略円筒状のハブ１２４の外周面に、複数枚の羽根１２５が樹脂一体成型により形成された軸流ファン２４において、回転方向の前方の稜線を前縁１２７、後方の稜線を後縁１２８とし、空気が流れてくる方向を上流、流れて行く方向を下流とした場合に、前記羽根１２５が前記ハブ１２４の外周面および略円筒の上流側端部１３２で保持され、略一定の板厚の略円筒状の前記ハブ１２４は、前記羽根１２５の前縁１２７部分に対応する部分に、回転軸側に凹む凹部１３５を形成した。【選択図】図２