| 摘要 |
PURPOSE:To enable efficient cooling by providing a rib connecting respective fan pieces in the circumferential direction integrally with the pieces on almost the center portion of the axial direction of the fan pieces. CONSTITUTION:A rib 23b ranged in the circumferential direction is formed on almost the center of the axial direction of fan pieces 23a, and the rib is designed that the outer edge portion is thinner that the center portion to become to be adverse V-shape. And an outer peripheral portion 23c of a drive member 23 and an outer edge portion 23e of the fan piece 23a are formed to become larger in diameter as nearer to mounting portions 23d, 23f of the rib 23b from both ends in the axial direction. And in the rib mounting portion 23d, the outer perpheral portion of the drive manner and the rib are connected with a relatively large radial are so as to flow cooling wind without trouble. Then, cooling wind is increased and flow-in amount from a wind introduction unit of a bracket can be increased especially, and contact area of the cooling wind and a coupler can be increased. |
