Bearings – Rotary bearing – Plain bearing
Reexamination Certificate
1999-08-17
2001-06-26
Footland, Lenard A. (Department: 3682)
Bearings
Rotary bearing
Plain bearing
C384S537000, C384S584000
Reexamination Certificate
active
06250810
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a motor structure, and more particularly, to a pillow having vibration-absorbing means and heat insulating means of a motor structure.
2. Description of the Related Art
In rotation, the temperature of the stator of a common motor rises and its heat is transferred to its surroundings. The heat transferred to the bearing adversely affects its life. In a common fan motor, e.g. a fan motor disclosed in U.S. Pat. No. 5,343,104, a pillow is provided between a bearing and the stator of the motor. The heat generated in the stator of the motor transfers to the bearing through the pillow. A conventional fan motor similar to the fan motor disclosed in U.S. Pat. No. 5,343,104 will be described in the following.
FIG. 1
shows a conventional fan motor structure. It comprises an upper casing
101
; a lower casing
102
having a base portion
102
a
and a pillow portion
102
b;
a bearing
103
accommodated in the pillow portion
102
b;
a rotation shaft
104
supported by the bearing
103
; a C-ring
105
snap engaged with the rotation shaft
104
for fixing the bearing
103
at an axial location; an impeller
106
; a coil unit
107
, and a printed circuit board
108
. The impeller
106
consists of a plurality of blades
106
a,
a yoke
106
b,
a ring-shaped magnet
106
c,
and a hub portion
106
d.
The coil unit
107
consists of an upper cover
107
a,
a lower cover
107
b,
and a stator core
107
c.
When the impeller rotates, the heat generated in the coil unit
107
transfers to the bearing
103
through the pillow portion
102
b
and causes an adverse effect. Generally speaking, the pillow portion
102
b
can be made of plastic or copper.
Although the pillow portion
102
b
made of plastic can achieve a certain degree of insulation, most of the heat rapidly transfers to the bearing
103
through the thin sidewall of the pillow portion
102
b.
The pillow portion
102
b
made of copper can rapidly transfers heat to the bearing
103
because it can achieve a good heat conduction effect. Therefore, the pillow portion
102
b
cannot insulate the bearing
103
from the heat generated in the coil unit
107
to avoid the adverse effect on the bearing
103
.
Moreover, when the fan motor operates, the vibration of the impeller
106
transmits to the bearing
103
through the rotation shaft
104
and then transmits to the coil unit
107
and the printed circuit board
108
through the pillow portion
102
b.
The slight transmission of the vibration can result in the vibration and noises of the system in which the fan motor is mounted and serious transmission of the vibration can result in the disengagement between the coil unit
107
and the printed circuit board
108
or even the disengagement of the electronic elements (not shown) from the printed circuit board
108
. Therefore, if the vibration can be absorbed more effectively then the life of all the elements of the fan motor can be prolonged.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a pillow having vibration absorbing and heat insulating features. More specifically, the pillow can absorb the vibration generated when the motor operates and can prevent the heat generated in the motor from transmitting to the bearing in the motor.
In accordance with the first aspect of the invention, a pillow for holding a bearing comprises an outer circumferential sidewall having a radially inner side; an inner circumferential sidewall for holding the bearing, the inner circumferential sidewall having a first end connected with the radially inner side of the outer circumferential sidewall and a second end opposite to the first end, and the outer circumferential sidewall and the inner circumferential sidewall being spaced apart except at the first end.
The outer circumferential sidewall and the inner circumferential sidewall are integrally formed.
The pillow further comprises an inner bottom portion connected with the second end of the inner circumferential sidewall for closing the second end of the inner circumferential sidewall. The outer circumferential sidewall, the inner circumferential sidewall, and the inner bottom portion are integrally formed. The pillow is made of plastic material.
In accordance with the second aspect of the invention, a pillow for holding a bearing comprises a base portion; an outer circumferential sidewall vertically provided on said base portion and having a radially inner side; and an inner circumferential sidewall for holding said bearing, the inner circumferential sidewall having a first end connected with the radially inner side of said outer circumferential sidewall and a second end opposite to said first end, and said outer circumferential sidewall and said inner circumferential sidewall being spaced apart except at said first end.
The outer circumferential sidewall and the inner circumferential sidewall are integrally formed.
The pillow further comprises an inner bottom portion connected with the second end of the inner circumferential sidewall for closing the second end of the inner circumferential sidewall. The outer circumferential sidewall, the inner circumferential sidewall, and the inner bottom portion are integrally formed. The pillow is made of plastic material.
REFERENCES:
patent: 5735668 (1998-04-01), Klein
Chang Shon-Chen
Huang Wen-Shi
Bacon & Thomas PLLC
Delta Electronics , Inc.
Footland Lenard A.
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