Base and hard disk drive device
A base serves as a part of a housing of a hard disk drive device. The base includes a bottom plate part and a pivot shaft extending in a top-bottom direction. The pivot shaft includes a first shaft part formed integrally with the bottom plate part, and a second shaft part fixed to the first shaft part in a lower end region, a cover of the hard disk drive device being attached to the second part shaft in an upper end region.
1 . A base serving as a part of a housing of a hard disk drive device, the base comprising:
a bottom plate part; and
a pivot shaft extending in a top-bottom direction, wherein
the pivot shaft includes:
a first shaft part formed integrally with the bottom plate part; and
a second shaft part fixed to the first shaft part in a lower end region,
the second shaft part including an upper end surface and a screw hole formed through the upper end surface, the second shaft part connecting a cover which is fastened to the screw hole by a fastener, wherein
the first shaft part includes a first base portion extending upward from the bottom plate part,
the second shaft part includes a second base portion, a downward extending portion extending downward from the second base portion, and a hole portion recessed upward from a lower end surface of the downward extending portion, the cover being attached to the second base portion,
the bottom plate part includes a recessed part formed by recessing a portion of the bottom plate part downward,
the first base portion extends upward from a bottom surface of the recessed part,
the second shaft part includes a flange portion accommodated in the recessed part and extending from an outer surface of the downward extending portion in a direction perpendicular to the top-bottom direction,
the flange portion includes a mounting surface facing upward, and
the mounting surface is for mounting an access part.
2 . The base according to claim 1 , wherein an adhesive is interposed between the first base portion and the hole portion.
3 . The base according to claim 1 , wherein the downward extending portion includes a connection passage connecting an interior space and an exterior space of the hole portion with the first base portion being press-fitted into the hole portion.
4 . The base according to claim 1 , wherein the flange portion includes a flange outer surface extending downward from an outer edge of the mounting surface, forming a gap between the flange outer surface and an inner surface of the recessed part.
5 . A hard disk drive device comprising:
the base according to claim 1 ;
the cover attached to the base, forming the housing together with the base;
a spindle motor disposed inside the housing and supported by the base;
a recording disk disposed inside the housing and rotated by the spindle motor; and
an access part supported by the pivot shaft inside the housing, recording data onto the recording disk, and reading data recorded on the recording disk.
6 . The hard disk drive device according to claim 5 , wherein the housing contains a gas having a lower density than air.
7 . A base serving as a part of a housing of a hard disk drive device, the base comprising:
a bottom plate part; and
a pivot shaft extending in a top-bottom direction, wherein
the pivot shaft includes:
a first shaft part formed integrally with the bottom plate part; and
a second shaft part fixed to the first shaft part in a lower end region, the second shaft part including an upper end surface and a screw hole formed through the upper end surface, the second shaft part connecting a cover which is fastened to the screw hole by a fastener, wherein
the first shaft part includes a first base portion extending upward from the bottom plate part,
the second shaft part includes a second base portion, a downward extending portion extending downward from the second base portion, and a hole portion recessed upward from a lower end surface of the downward extending portion, the cover being attached to the second base portion,
the first shaft part includes a tapered portion extending upward from the first base portion, and
a distance between the tapered portion and the hole portion increases from a proximal end at a side of the first base portion toward a distal end.
8 . A hard disk drive device comprising:
the base according to claim 7 ;
the cover attached to the base, forming the housing together with the base;
a spindle motor disposed inside the housing and supported by the base;
a recording disk disposed inside the housing and rotated by the spindle motor; and
an access part supported by the pivot shaft inside the housing, recording data onto the recording disk, and reading data recorded on the recording disk.
9 . The hard disk drive device according to claim 8 , wherein the housing contains a gas having a lower density than air.
10 . The base according to claim 7 , wherein the downward extending portion includes a connection passage connecting an interior space and an exterior space of the hole portion with the first base portion being press-fitted into the hole portion.