Cooling fan
AssigneesFu Zhun Precision Industry (Shen Zhen) Co., Ltd., Foxconn Technology Co., Ltd.
InventorsYong-Kang Zhang, Zhi-Ya Yang, Ying-Liang Li
Life of this patent
Estimating the term…
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 rotatably 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
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.
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 a groove is defined in an outer circumference of a bottom end of the sleeve bearing, and the oil retaining element is received in the groove.
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, an oil retaining element arranged adjacent to the sleeve bearing to provide oil for the sleeve bearing, and a second oil retaining element arranged between a top end of the sleeve bearing and the step of the tube;
- and
- a rotor having a shaft extending into and rotatably supported by the bearing assembly.
Dependencies are inferred from the claim text.