| 摘要 |
PROBLEM TO BE SOLVED: To improve cooling efficiency of a rotor core, while reducing a size and a weight.SOLUTION: An oil accumulation part 18 which is recessed in an outer side of a radial direction of a rotor core holding part 16, is extended to a while circumference of an inner peripheral part 4202, and can accumulate an oil is provided in at least a vicinity of an axial center of the inner peripheral part 4202 of the rotor core holding part 16. The oil accumulated in the oil accumulation part 18 passes through a first oil passage 24 provided to the rotor core holding part 16 by centrifugal force, and is guided to a periphery 4204 of the rotor core holding part 16. The oil guided to the periphery 4204 of the rotor core holding part 16 passes through a second oil passage 26 from the vicinity of a center part of an axial direction of the rotor core holding part 16, flows to an end plate 44 direction in both sides, and is ejected from an opening part 2602 of the second oil passage 26.SELECTED DRAWING: Figure 1 |
