This invention concerns the cooling fan, in particular, the bearing for the blade rotor shaft.
The bearing structure for conventional cooling fan main comprises a bearing, oil seal, washer, C-clamp and other parts, it usually takes great time, labor and cost to assemble. Under long time use, the bearing will produce mechanical noise, or runs not smoothly and the service life is therefore shortened substantially. Now there emerges a named “Efficient bearing” as shown in
The “efficient bearing” as shown in
This forms a complete assembly of the blade assembly.
In this prior art of the bearing structure, it requires the seat 3′ to seal the opening of the base 2′. Although, the recess 31 of the seat 3, with the semicircular parts of the lower end of the rotor shaft 25′ conduced to round tip 26′, and provide support for the down edge of blade 23′, but, this bearing design including the body 1′ and seat 3′ leaves room for improvement.
The repulsive force jointly produced by the permanent magnet 4′ contained in the hub 24′ of the blade 23′ and the rotor winding 22′ pushes the blade 23′ to rotate and the blade 23′ will float up and down in the appropriate room and maintain the proper displacement to gain self-adjusted balance. The round project 13′ of the localized flange 12′ retains closely on the groove 27′ of the rotor shaft 25′, while the blade 23′ is rotating, the round project 13′ of the localized flange 12′ will confines the up and down displacement of the blade 23′. The tight contact of the round project 13′ and the groove 27′ generates great abrasive resistance, which not only destabilizes the smooth operation of the blade but also shortens the service life.
The main object of this invention is to provide a simplified, precise, easy to assemble and less friction “bearing structure”.
To achieve the above object, the bearing provided this invention has an integrally formed hollow cylindrical body and an outward extended seat with larger diameter than the body. The center of the upper body is a hollow cavity with extended flange and project. The rotor shaft will enter the cavity and the project of the flange will retain on the round grove of the rotor shaft.
This design simplifies the bearing structure where the seat forms an upward cone to be pressed into the inverted groove of the base of the blade. The rotor shaft, after entering the cavity, is first retrained by the project retaining on the round groove and the C clamp at the lower end permitting the blade floating up and down within a limit space. The tiny clearance maintained between the project and the groove optimizes the self-adjusted balance of the repulsive force coming from the rotor winding. The project is design to keep away the dust falling into the cavity so as to lengthen the service life.
The bearing is made of the plastic steel material instead of the ball bearing, which stands out the following advantages:
As shown in
Which is in the form of hollow cylindrical body 11 with an outward extended seat 12 having a diameter larger than the body 11. The seat has a recess 121 and body has a cavity 13 with upward flange 14.
The seat 12 is skew cone swelling from bottom and upward to the top.
The cavity 13 is a go-through hole linked to the recess 121.
As shown in
As shown in
As shown in
After the rotor shaft 262 enters the cavity 13 of the bearing 1, the flange 14 catches the round groove 265 and the C-clamp 3 is inserted in place. The rotor shaft 262 enters the cavity 13 and displaces up and down within a limited distance in the round groove 265. When the power is turned on, the rotor winding 25 is excited, the magnet 264 reacts with a repulsive force, causing the rotor shaft to rotate, at this moment the blade 26 will continue rotating and gradually reaching the balance.
It is well learned the fact that this bearing 1 is an integral form design, easy for production and assembly. The flange 14 of the cavity 13 buckled in the round groove 265 of the rotor shaft 262 retains the displacement of the rotor shaft 262, and avert the blade 26 depart in the rotating. Also, the flange 14 works a dust shield to prevent the dust falling into the cavity 13, effectively reducing the friction resistance of the rotor shaft 262. Since the rotor shaft 262 is retrained to float within short distance, easy to reach balanced rotation in short time.
The bearing structure of this invention provides a precise design, easy production and assembly, effective reduction of friction resistance and noise, and self-lubrication. These advantages excel the prior art of bearing for the cooling fan.
Number | Name | Date | Kind |
---|---|---|---|
6699020 | Lin | Mar 2004 | B1 |
6926497 | Lin et al. | Aug 2005 | B2 |
20030108260 | Chuang | Jun 2003 | A1 |
Number | Date | Country | |
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20050147511 A1 | Jul 2005 | US |