# US 2013/0154416 A1 · Spindle motor

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- Number: US 2013/0154416 A1
- Document ID: US20130154416A1
- Status: Published application
- Kind: A1
- Application number: 13/709,565
- Filed: 2012-12-10
- Published: 2013-06-20
- Earliest claimed: 2011-12-15
- Assignees: Samsung Electro-Mechanics Co., Ltd.
- Inventors: Young Ha PARK
- Web page: https://patentgrep.com/patent/US20130154416A1

## CPC

- H02K 7/086: {radially supporting the rotor around a fixed spindle; radially supporting the rotor directly (H02K7/09 takes precedence)}
- F16C 17/107: {with at least one surface for radial load and at least one surface for axial load}
- F16C 33/103: {retained in or near the bearing}
- F16C 33/745: {by capillary action}
- H02K 5/1677: {radially supporting the rotor around a fixed spindle; radially supporting the rotor directly}
- F16C 32/0633: {the liquid being retained in a gap}
- F16C 2370/12: Hard disk drives or the like
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS

## Abstract

There is provided a spindle motor including: a lower thrust member fixedly installed on a base member and including an extension part extended upwardly in an axial direction; a shaft having a lower end portion fixedly installed on the lower thrust member; a sleeve rotatably installed with respect to the shaft; an upper thrust member fixedly installed on the shaft to correspond to an upper portion of the sleeve; and a rotor hub rotating together with the sleeve, wherein an end portion of the extension part and a surface of the sleeve opposed thereto are provided with rounded surfaces.

## Claims

### Claim 1

A spindle motor comprising:
a lower thrust member fixedly installed on a base member and including an extension part extended upwardly in an axial direction;
a shaft having a lower end portion fixedly installed on the lower thrust member;
a sleeve rotatably installed with respect to the shaft;
an upper thrust member fixedly installed on the shaft to correspond to an upper portion of the sleeve; and
a rotor hub rotating together with the sleeve,
wherein an end portion of the extension part and a surface of the sleeve opposed thereto are provided with rounded surfaces.

### Claim 2 (depends on 1)

The spindle motor of claim 1, wherein a lubricating fluid is injected via a space formed between the rounded surfaces of the extension part and the surface of the sleeve opposed thereto.

### Claim 3 (depends on 1)

The spindle motor of claim 1, wherein either of a central portion of an outer peripheral surface of the shaft and a central portion of an inner peripheral surface of the sleeve is provided with a recessed groove formed in a circumferential direction and having upper and lower inclined surfaces as upper and lower edges thereof.

### Claim 4 (depends on 3)

The spindle motor of claim 3, wherein the sleeve forms upper and lower bearing clearances together with the shaft and the upper and lower thrust members, and
upper and lower portions of an outer peripheral surface of the sleeve are provided with upper and lower inclined portions so as to form liquid vapor interfaces together with the upper and lower thrust members.

### Claim 5 (depends on 4)

The spindle motor of claim 4, wherein the sleeve includes a communication hole allowing a space formed between the inner peripheral surface thereof and the recessed groove to be in communication with the outside.