| 摘要 |
PURPOSE:To prevent rise in temperature at the bearing part on the lower stream side by a construction wherein a ventilation path for directly introducing the open air is formed near the bearing part on the lower stream side independently of cooling air that is forcedly ventilated from one end to the other end of the rotary machine in its axial direction. CONSTITUTION:Cooling air B introduced through an open air inlet 10 at one axial end of the rotary electric machine by a pushing or drawing technique is forcedly ventilated to an exhaust port 11 formed in an end cover 7 on the other axial end through a thrust duct 12 of a rotor core 2 and a stator core. Independently of the cooling air B, a ventilation path 13 for directly introducing open air D to a bearing 5 on the lower stream side is provided to cool the bearing part. The ventilation path 13 comprises, for example, a bypass bore 14 axially extending through the thick wall part of a frame 6 from a position near the open air inlet 10, an introducing bore 15 extending toward the center of the end cover 7 and communicating with the bypass bore 14, a ventilation space 16 extending through a bearing housing 7a in the inner side thereof in parallel to its periphery, a vent bore 17 extending outward from the small-diameter side of the ventilation space 16, and an outlet port 19 penetrating through the housing end cover 18. |
