Pumps – Motor driven – Motor within rotary pumping member
Reexamination Certificate
2000-04-04
2001-07-31
Koczo, Michael (Department: 3746)
Pumps
Motor driven
Motor within rotary pumping member
C417S423120
Reexamination Certificate
active
06267567
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is related to a cooling fan, and more particular to a cooling fan which is easy to assemble, has low-noise and has an effective lubricant seal.
2. Description of Related Art
A conventional cooling fan used for a computer is shown in FIG.
3
. The fan comprises a housing (
80
) with a recess (not numbered). A seat (
801
) is formed at a bottom face of the recess of the housing (
80
). A circuit board (
83
) and a stator assembly (
82
) are fixedly provided on an outer periphery of a sleeve (
81
) secured on the seat (
801
). A self-lubricating bearing (
88
) is received in the sleeve (
81
), and a core (
841
) of a rotor (
84
) covering the stator assembly (
82
) is inserted in the bearing (
88
). A collar (
87
) is provided on a distal end of the core (
841
) to secure the rotor (
84
) in the bearing (
88
). Washers (
85
) and oil-seals (
86
) are respectively mounted on the core (
841
) at both ends of the bearing (
88
) to prevent lubrication leaking from the bearing (
88
). Finally, a sheet (
89
) is fitted on a bottom end of the sleeve (
81
) to seal the workings of the fan.
However, the conventional cooling fan has some shortcomings which are as follow:
1. When the fan is running, the washers (
85
) and the oil-seals (
86
) rotate with the core (
841
) of the rotor (
84
), and friction generated between the washers (
85
) and the sleeve (
81
), and the oil-seals (
86
) and the bearing (
88
) causes a large noise.
2. Because the washers (
85
) and the oil-seals (
86
) are small elements, it is difficult to assemble them. Moreover, a special tool is needed to assemble the collar (
87
) on the core (
841
).
3. The oil-seals (
86
) can not completely prevent the lubrication from leaking out.
Therefore, it is an objective of the invention to provide an improved cooling fan to mitigate and/or obviate the aforementioned problems.
SUMMARY OF THE INVENTION
The main objective of the present invention is to provide a cooling fan which is easy to assemble, has a low noise and an effective lubricant seal.
Other objects, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 2768583 (1956-10-01), Richard et al.
patent: 3961864 (1976-06-01), Papst
patent: 5979541 (1999-11-01), Saito
patent: 6183221 (2001-02-01), Hsieh
Chao Fei-Fei
Koczo Michael
Venable
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