Motor
AssigneeNidec Corporation
InventorsHiroki YAMADA, Atsushi WATASHITA, Keisuke KAWATA
Life of this patent
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Abstract
A motor includes a shaft, a bearing that rotatably supports the shaft, and a hub fixed to the shaft. The shaft includes a first shaft portion extending in an axial direction, a second shaft portion projecting axially upward from an axially upper end surface of the first shaft portion and including a diameter smaller than that of the first shaft portion, and a screw hole recessed axially downward from the axially upper end surface. The hub includes a shaft fixing hole into and in which the second shaft portion is inserted and fixed. An outer surface of the second shaft portion includes a first region, and a second region axially above the first region, and including surface roughness smaller than that of the first region.
Claims6
A motor comprising:
- a shaft extending along a central axis in a vertical direction, and rotatable about the central axis;
- a bearing that rotatably supports the shaft;
- and
- a hub fixed to the shaft;
- wherein
- the shaft includes:
- a first shaft portion extending in an axial direction;
- a second shaft portion projecting axially upward from an axially upper end surface of the first shaft portion, and including a diameter smaller than that of the first shaft portion;
- and
- a screw hole recessed axially downward from the axially upper end surface;
- the hub includes a shaft fixing hole into and in which the second shaft portion is inserted and fixed;
- and
- an outer surface of the second shaft portion includes:
- a first region;
- and
- a second region located axially above the first region, and including a surface roughness smaller than that of the first region.
Dependencies are inferred from the claim text.