US 2012/0087816 A1Published application

Cooling fan

AssigneesFoxconn Technology Co., Ltd., Fu Zhun Precision Industry (Shen Zhen) Co., Ltd.

InventorsYONG-KANG ZHANG, ZHI-YA YANG, YING-LIANG LI

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Abstract

A cooling fan (1) includes a fan housing (10), a stator (20), a rotor (30) and a bearing assembly (40). A tube (111) extends upwardly from a central portion of the fan housing. The stator is mounted around the tube. The bearing assembly includes a ball bearing (333) and a sleeve bearing (335) received in two ends of the tube, respectively. The rotor has a shaft (336) extending into and roratably supported by the bearing assembly. An elastic element (332) is arranged on the ball bearing to provide a pressing force on the ball bearing toward the sleeve bearing. An oil retaining element (339) is arranged around a bottom end of the shaft and spaced from the shaft. The oil retaining element is attached to the sleeve bearing to provide oil for the sleeve bearing.

Claims5

Dependent claims

A cooling fan, comprising:

a tube with a through hole defined therein and extending along an axial direction thereof, the through hole comprising an upper portion and a lower portion with a diameter larger than that of the upper portion, a step being formed between the upper portion and the lower portion;
a stator mounted around the tube;
a bearing assembly comprising a ball bearing received in the upper portion of the tube and a sleeve bearing received in the lower portion of the tube, an elastic element arranged adjacent to the ball bearing to provide a pressing force on the ball bearing, and an oil retaining element arranged adjacent to the sleeve bearing to provide oil for the sleeve bearing;
a rotor having a shaft extending into and rotatably supported by the bearing assembly;
and
a cover coupled to a bottom end of the tube to seal the bottom end of the tube, the sleeve bearing being sandwiched between the step and the cover;
wherein the oil retaining element is arranged in the cover, a top end of the oil retaining element abutting a bottom end of the sleeve bearing, an inner diameter of the oil retaining element being larger than a diameter of the shaft, and a bottom end of the shaft extending into the oil retaining element.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/329,329Filed 19 Dec 2011
Priority: CN 200810065464.529 Feb 2008
Published: 12 Apr 2012
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

F04D 25/062
The electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator: details of the bearings
F04D 25/0626
The electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator: details of the lubrication
F04D 29/051
Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps: axial thrust balancing
F04D 29/057
Bearings: hydrostatic; hydrodynamic

Family

Application12/056,297Division · filed 27 Mar 2008
Application13/329,329Division
US 2009/0220360 A1Published application
US 8,100,673 B2Related patent
US 8,435,018 B2Related patent
US 2012/0087816 A1This patent

From the US filing history. Foreign family members aren’t listed.