Combination of a base and an axle tube for a motor

Details Combination of a base and an axle tube for a motor Combination of a base and an axle tube for a motor

2003-03-31

2004-11-16

Le, Dang (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S090000, C360S099040

Reexamination Certificate

active

06819021

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a combination of a base and an axle tube for a motor. In particular, the present invention relates to a combination of a base and an axle tube for a motor, wherein the base and the axle tube are engaged with each other through a positioning groove and a positioning protrusion.
2. Description of Related Art
FIG. 1
of the drawings illustrates a conventional structure of a base and ax axle tube for a motor. Such a structure is disclosed in, e.g., Taiwan Utility Model Publication No. 343808 entitled “POSITIONING STRUCTURE FOR A STATOR AND SENSING ELEMENTS FOR A MINIATURE HEAT-DISSIPATING FAN”. As illustrated in
FIG. 1
, an axle tube
11
is integrally formed on a base (not shown) of a motor and made of plastics. Further, the axle tube
11
has an outer periphery for tightly engaging with a circuit board
12
and a stator
13
. A bearing
14
is mounted in the axle tube
11
.
FIG. 2
of the drawings illustrates another conventional structure of a base and an axle tube for a motor. Such a structure is disclosed in, e.g., Taiwan Utility Model Publication No. 236471 entitled “STATOR STRUCTURE FOR A MINIATURE HEAT-DISSIPATING FAN”. As illustrated in
FIG. 2
, the base
10
includes an axial hole
101
and a flange extending upward from a peripheral edge delimiting the axial hole
101
. The axle tube
11
is preferably made of metal and includes a lip
11
a
on an upper end thereof. A lower portion of the axle tube
11
is tightly engaged with the flange
102
of the base
10
, and an outer periphery of the axle tube
11
is tightly engaged in a central hole
130
of a stator
13
. And the stator
13
is retained on the base
10
by the lip
11
a
of the axle tube
11
.
FIG. 3
of the drawings illustrates a miniature D.C. fan having a further conventional structure of a base and ax axle tube for a motor. Such a structure is disclosed in, e.g., U.S. Pat. No. 5,267,842. As illustrated in
FIG. 3
, the miniature D.C. fan includes a casing
1
, a base
10
, and an axle tube
11
. The base
10
is made of plastics and supported by a plurality of ribs of the casing
1
, and the axle tube
11
is integrally formed with the base
10
. The axle tube
11
includes a plurality of shoulders
11
b
,
11
c
, and
11
d
for tightly engaging with a stator
13
, a circuit board
12
, and at least one bearing
14
(preferably ball bearing), respectively.
Although the structures shown in
FIGS. 1 through 3
are simple and easy to assemble at a low cost, time-consuming lathing or drilling is, however, required for forming the inner periphery and the outer periphery of the axle tube
11
for accurately positioning and assembling with the circuit board
12
, the stator
13
, and the bearing
14
. Further, the bearing
14
and/or the axle tube
11
are apt to deform when proceeding with the procedure for tightly engaging the bearing
14
in the axle tube
11
. Further, the axle tube
11
may turn or move upward relative to the base
10
, as the axle tube
11
is merely engaged with the base of the motor by means of tight fitting. Further, the base
10
and the axle tube
11
can only be used with the stator
13
of a single specification; namely, the base
10
, the axle tube
11
, and the housing
1
must be redesigned if the stator
13
is of another specification. As a result, when the motor using any one of the axle tubes
11
shown in
FIGS. 1 through 3
turns, the rotational movement is not balanced and noise is generated. Further, the assembly and design for motors are less flexible. Further, the stator might be loosened, which leads to shortening of the life of the motor.
OBJECTS OF THE INVENTION
An object of the present invention is to provide a combination of a base and an axle tube for a motor, wherein the base and the axle tube are engaged with each other through a positioning groove and a positioning protrusion. The axle tube includes resilient hook rods for reliably assuring that a central axis of the stator is coaxial with a central axis of the bearing.
Another object of the present invention is to provide a combination of a base and an axle tube for a motor, wherein the axle tube can be quickly replaced for using with a bearing and a stator of different specifications.
SUMMARY OF THE INVENTION
To achieve the aforementioned objects, the present invention provides a combination of a base and an axle tube for a motor. The base includes a tubular body and an axial hole. A flange extends upward from a peripheral edge delimiting the axial hole and has an inner periphery. At least one positioning groove is defined in a lower portion of the inner periphery of the flange. The axle tube includes at least one protrusion on a lower portion of an outer periphery thereof. The axle tube is extended through the axial hole of the base, with the lower portion of the outer periphery of the axle tube being engaged with the lower portion of the inner periphery of the axial hole of the base and with the protrusion of the axle tube being engaged in the positioning groove of the base. At least one resilient hook rod is formed in the tubular body of the axle tube and has a hook for securely retaining a stator around the axle tube and for securely retaining at least one bearing in the axle tube.
Other objects, advantages and novel features of this invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.


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