# US 2013/0156573 A1 · Fan

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- Number: US 2013/0156573 A1
- Document ID: US20130156573A1
- Status: Published application
- Kind: A1
- Application number: 13/676,158
- Filed: 2012-11-14
- Published: 2013-06-20
- Earliest claimed: 2011-12-19
- Assignees: Nidec Corporation
- Inventors: Yasuyuki KAJI
- Web page: https://patentgrep.com/patent/US20130156573A1

## CPC

- F01D 25/162: {Bearing supports}
- F04D 25/062: {Details of the bearings}
- F04D 29/023: {especially adapted for elastic fluid pumps}
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)

## Abstract

A fan includes a stationary portion, a rotating portion, and a plurality of blades. The stationary portion includes a stator, an integral one-piece molded metal bearing housing, a bearing portion in the bearing housing, and a molded resin base portion supporting the bearing housing. The rotating portion includes a rotor holder, a rotor magnet, and a shaft. The bearing housing includes a cylindrical portion, and a protruding portion extending radially outwards from a lower portion of the cylindrical portion. The cylindrical portion includes a groove portion extending in an axial direction and arranged in a circumferential direction. The groove portion is joined to a region on the lower side of the protruding portion along a connecting position between the cylindrical and protruding portions. A resin on an upper side of the protruding portion, a resin on a lower side, and a resin in the groove portion are continuous.

## Claims

### Claim 1

A fan comprising:
a stationary portion;
a rotating portion rotatably supported by the stationary portion; and
a plurality of blades arranged on an outer circumference of the rotating portion to generate a flow of air by rotation of the rotating portion; wherein
the stationary portion includes:
a stator;
a bearing housing arranged on an inside of the stator, and defined by a molded metal integral one-piece member;
a bearing portion arranged in the bearing housing; and
abase portion made of molded resin and arranged to support the bearing housing;
the rotating portion includes:
a rotor holder having a cylindrical or substantially cylindrical shape with a cover;
a rotor magnet arranged on a radially outer side of the stator and on an inner side of an inner circumferential surface of the rotor holder; and
a shaft connected to the cover of the rotor holder and inserted into the bearing portion;
the bearing housing includes:
a cylindrical portion; and
a protruding portion expanding radially outwards from a lower portion of the cylindrical portion;
the cylindrical portion includes, on an outer circumferential surface, at least one groove portion extending in an axial direction and arranged in a circumferential direction; and
the at least one groove portion is joined to a region on a lower side of the protruding portion along a side of a connecting position between the cylindrical portion and the protruding portion such that a resin positioned on an upper side of the protruding portion as a portion of the base portion, a resin positioned on a lower side, and a resin existing in the at least one groove portion are all continuously provided with one another.

### Claim 2 (depends on 1)

A fan according to claim 1, wherein the at least one groove portion includes a plurality of groove portions.

### Claim 3 (depends on 2)

A fan according to claim 2, wherein a portion between the plurality of groove portions expands radially outwards in a connecting portion that connects the cylindrical portion and the protruding portion.

### Claim 4 (depends on 1)

A fan according to claim 1, wherein a lower end of the cylindrical portion is positioned on the lower side of the protruding portion.

### Claim 5 (depends on 1)

A fan according to claim 1, wherein a bottom of the at least one groove portion is inclined radially inwards toward the lower portion.

### Claim 6 (depends on 1)

A fan according to claim 1, wherein
the protruding portion includes a plate portion annularly extending radially outwards from the lower portion of the cylindrical portion; and
a portion of the at least one groove portion in the axial direction includes at least one through hole provided through the plate portion.

### Claim 7 (depends on 6)

A fan according to claim 6, wherein the plate portion includes at least one recessed portion which is recessed radially outwards with respect to the outer circumferential surface of the cylindrical portion as a radially outside portion of the at least one through hole.