Axle tube structure for a motor

Details Axle tube structure for a motor Axle tube structure for a motor

2002-02-22

2003-09-09

Ramirez, Nestor (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S06700R, C310S090000, C310S254100, C310S216055

Reexamination Certificate

active

06617736

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an axle tube structure for a motor. In particular, the present invention relates to an improved axle tube that allows easy, reliable assembly of all of the elements of a motor.
2. Description of the Related Art
A conventional miniature heat-dissipating fan, as illustrated in
FIG. 8
of the drawings, includes a circuit board
90
on which an axle tube
91
is formed. A stator
92
includes a central hole
94
that is force-fitted around the axle tube
91
. A bearing
93
is mounted in the axle tube
91
. The axle tube
91
is made of plastic material and is integrally formed with a plastic casing. In order to accurately assemble the bearing
93
, the inner periphery of the axle tube
93
is processed by lathing or drilling to form an axle hole with a precise dimension for allowing force-fitting with the bearing
93
. However, such a manufacturing process is troublesome. In addition, the stator
92
, after assembly, cannot be reliably retained in place. Further, since the bearing
93
would generate heat when the rotor turns, the axle tube
91
expands as a result of heat expansion. Thus, the bearing
93
and the stator
92
cannot obtain the required force-fitting engagement therebetween. As a result, the rotor cannot turn stably, and noise occurs accordingly. Further, the stator
92
and the axle tube
91
may even disengage from each other.
SUMMARY OF THE INVENTION
It is the primary object of the present invention to provide an axle tube structure for a motor, wherein a reliable assembly is obtained without the risk of disengagement after the stator is force-fitted around the axle tube.
It is the secondary object of the present invention to provide an axle tube structure for a motor, wherein the axle tube includes an axle hole for easy, reliable engagement with two bearings that are coaxially engaged with an inner periphery defining the axle hole of the axle tube. Thus, the motor turns more smoothly and the noise is reduced.
An axle tube structure for a motor in accordance with the present invention comprises a casing having an axle tube. An inner periphery of the axle tube includes plural grooves each having an open upper end. An annular groove is defined in a bottom of the inner periphery of the axle tube. An engaging member includes a ring engaged in the annular groove of the axle tube and plural legs extending from the ring. Each leg is engaged in an associated one of the grooves of the axle tube.


REFERENCES:
patent: 5436519 (1995-07-01), Takahashi et al.
patent: 5562347 (1996-10-01), Hsieh
patent: 6072261 (2000-06-01), Lin
patent: 6400053 (2002-06-01), Horng
patent: 6435722 (2002-08-01), Horng

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