Dustproof bearing device for a motor

Details Dustproof bearing device for a motor Dustproof bearing device for a motor

2002-08-06

2004-06-29

Nguyen, Tran (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S06700R, C310S090000, C310S091000, C384S279000, C384S286000

Reexamination Certificate

active

06756714

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a dustproof bearing device for a motor. In particular, the present invention relates to a dustproof bearing device that prevents entrance of dust and impurities into the bearing of the motor and that prevents loss of lubricating oil of the bearing.
2. Description of the Related Art
FIGS. 7 and 8
of the drawings illustrate a conventional bearing structure comprising an axle tube
90
, an upper cap
91
tightly fitted in an upper end of the axle tube
90
and having a hole
911
, a rotor having a shaft
92
extending through the hole
911
of the upper cap
91
, and a connecting member
93
for retaining the upper cap
91
on the shaft
92
. The connecting member
93
includes an annular wall
931
that extends beyond the hole
911
of the upper cap
91
and abuts against a shaft base
921
of the rotor. An oily bearing
94
is mounted around the shaft
92
and located below the connecting member
93
. The oily bearing
94
is mounted in the hole
911
of the axle tube
90
in a non-tight engaging relationship. A lower cap
95
is mounted to a lower end of the axle tube
90
, thereby limiting the oily bearing
94
between the upper cap
91
and the lower cap
95
for rotatably holding the shaft
92
of the rotor.
As illustrated in
FIG. 8
, since gaps exist between the annular wall
931
of the connecting member
93
and the hole
911
of the upper cap
91
and between the connecting member
93
and an inner periphery of the upper cap
91
, dust and impurities are apt to enter the bearing
94
in the axle tube
90
through the gaps and thus accumulate between the bearing
94
and the shaft
92
of the rotor. As a result, the bearing
94
and the shaft
92
of the rotor are worn out rapidly.
FIG. 9
illustrates a heat-dissipating fan having a conventional dustproof structure. The fan includes an impeller
8
having a shaft
82
extending from an end wall thereof and a magnet
83
attached to a peripheral wall thereof. At least one set of concentrically arranged ribs
84
is provided on an inner face
81
of the end wall of the impeller
8
. The ribs
84
are located at a level adjacent to an upper pole plate
86
of a stator
85
, thereby forming a curved small gap between the ribs
84
and the upper pole plate
86
. An axle tube
87
extends through the stator
85
and includes an upper end
870
close to the inner face
81
of the end wall of the impeller
8
, thereby forming a curved small gap between the upper end
870
of the axle tube
87
and the inner face
81
of the end wall of the impeller
8
. The configuration of the ribs
84
and the upper end
870
of the axle tube
87
increase the length of the path through which air flows, and the curved small gaps prevent dust from entering the shaft
82
when the impeller
8
turns. However, although it is difficult for the dust to enter the shaft
82
, the dust may still enter the gap between the shaft
82
and the bearing
88
if the dust enters the axle tube
87
. Further, the dustproof structure fails to prevent loss of the lubricating oil in the bearing
88
.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a dustproof bearing device for a motor, wherein dust and impurities are reliably prevented from entering the bearing, thereby lengthening the life of the bearing.
Another object of the present invention is to provide a dustproof bearing device for a motor, wherein loss of the lubricating oil contained in the oily bearing is prevented, thereby lengthening the life of the bearing.
A motor in accordance with the present invention comprises an axle tube, a rotor, and a member. The axle tube includes a hole, and a stator is mounted to an outer periphery of the axle tube. The rotor includes an end wall having a shaft base from which a shaft extends. An annular wall extends from an inner face of the shaft base and surrounds the shaft. The member is mounted in the hole of the axle tube and rotatably receives the shaft of the rotor. The member includes a reduced section, forming a gap between the reduced section of the member and the axle tube. The annular wall extends into the gap between the reduced section of the member and the axle tube.
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.


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patent: 5424887 (1995-06-01), Schuh
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patent: 0392739 (1990-10-01), None
patent: 02184236 (1990-07-01), None
U.S. patent application Publication, Horng A., Brushless DC Motor with Axial Winding/Axial Airgap, Oct. 17, 2003, (US2002/0149285).

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