CPC H02K 7/003 (2013.01) [F16C 3/02 (2013.01); H02K 5/1732 (2013.01); H02K 7/083 (2013.01); F16C 2380/26 (2013.01)] | 4 Claims |
1. A shaft comprising: a supported portion that is rotatably supported by a bearing; and a large-diameter portion that is disposed closer to a center in an axial direction than the supported portion is, is adjacent to the supported portion, and has a larger diameter than the supported portion, the bearing being disposed such that a side surface of the bearing faces and comes close to an end face of the large-diameter portion on a side of the supported portion, the shaft being configured to rotate integrally with a rotor while holding the rotor, wherein
a cross-sectional shape of a boundary portion between the supported portion and the large-diameter portion in a longitudinal section of the shaft is formed in an arc shape that, on an outer side in the axial direction with respect to a virtual rising point, the virtual rising point being given when a rising angle of the large-diameter portion from the supported portion is assumed to be a right angle, has a radius of curvature larger than a radius of curvature of a concave corner formed by an outer edge of the supported portion and the end face of the large-diameter portion and is recessed inward in a radial direction of the supported portion.
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