US 2019/0379255 A1Published application

Motor and disk drive device

AssigneeNidec Corporation

InventorsDaisuke MORO, Tomohiro YONEDA, Hiroshi KOBAYASHI, Masayuki MAEDA

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Abstract

A motor includes a shaft along a central axis, an inner ring fixed on an outer circumferential surface of the shaft, a tubular sleeve extending axially around the shaft, an outer ring fixed to an inner circumferential surface of the sleeve via an adhesive agent, a cap annularly expanding around the shaft and covering an axially upper side of the inner and outer rings, and a bearing portion including dynamic pressure grooves in at least one of an outer circumferential surface of the inner ring and the inner circumferential surface of the sleeve. In the bearing portion, a stationary portion and a rotating portion face each other across a gap where lubricating oil is present. At least one interface of the lubricating oil is in a radial gap between the inner and outer rings. The cap includes a recess recessed axially downward over an entire circumference. At least a portion of an outer circumferential surface of the recess portion is fixed by press-fitting to an inner circumferential surface of the sleeve.

Claims12

Dependent claims

A motor comprising:

a stationary portion including a stator;
a rotating portion rotatably supported via a bearing portion about a vertically extending central axis with respect to the stationary portion;
a shaft disposed along the central axis;
an inner ring fixed on an outer circumferential surface of the shaft;
a tubular sleeve extending axially around the shaft;
an outer ring fixed to an inner circumferential surface of the sleeve;
a cap annularly expanding around the shaft and covering an axially upper side of the inner ring and the outer ring;
and
the bearing portion including a plurality of dynamic pressure grooves in at least one of an outer circumferential surface of the inner ring and the inner circumferential surface of the sleeve;
wherein
in the bearing portion, the stationary portion and the rotating portion face each other across a gap where lubricating oil is present;
at least one interface of the lubricating oil is positioned in a radial gap between the inner ring and the outer ring;
the cap includes a recess portion recessed axially downward over an entire circumference;
and
at least a portion of an outer circumferential surface of the recess portion is press-fitted to the inner circumferential surface of the sleeve.

12 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/432,217Filed 5 Jun 2019
Priority: JP 2018-11172112 Jun 2018
Published: 12 Dec 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification17 codes

H02K 5/1675
Using sliding-contact or spherical cap bearings: radially supporting the rotary shaft at only one end of the rotor
H02K 5/1677
Using sliding-contact or spherical cap bearings: radially supporting the rotor around a fixed spindle; radially supporting the rotor directly
F16C 17/026
For radial load only: with helical grooves in the bearing surface to generate hydrodynamic pressure, e.g. herringbone grooves
F16C 17/045
For axial load only: with grooves in the bearing surface to generate hydrodynamic pressure, e.g. spiral groove thrust bearings

Family

No related US applications are recorded in the indexed filing history.

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