Motor having a case for accommodating a stator
AssigneeMitsuba Corporation
InventorsYasushi Yoshida, Yutaro Jo
Life of this patent
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Abstract
A case 31 has a total of first to sixth flat parts 32A to 32F arranged in a circumferential direction of the case 31 and a total of first to sixth arced parts 32a to 32f connecting adjacent flat parts with each other. When viewed in an axial direction of a shaft 44, inner circumferential surfaces CF of the first to sixth arced parts 32a to 32f are each formed in an arced shape having a radius R1 and a center AC of the case 31 as the center. In addition, since the stator 35 is only supported by the inner circumferential surfaces CF (six in total), the press-fit load of the stator 35 with respect to the case 31 can be reduced, and it is possible to increase the assembling accuracy.
Claims3
A brushless motor, comprising:
- a stator, having a hollow part;
- a case, accommodating the stator;
- and
- a shaft, rotatably accommodated in the hollow part, and rotatably supported by the case,
- wherein:
- the case has a plurality of flat parts arranged in a circumferential direction of the case and a plurality of connection parts connecting adjacent flat parts of the flat parts with each other,
- when viewed in an axial direction of the shaft, inner circumferential surfaces of the connection parts are formed to be arc-shaped, with a center of the case as a center, and
- the stator is supported only by the inner circumferential surfaces,
- wherein, in a radial direction of the shaft, gaps are provided between the flat parts and the stator.
Dependencies are inferred from the claim text.