Rotary kinetic fluid motors or pumps – Bearing – seal – or liner between shaft or shaft sleeve and...
Reexamination Certificate
2001-08-09
2003-05-20
Look, Edward K. (Department: 3745)
Rotary kinetic fluid motors or pumps
Bearing, seal, or liner between shaft or shaft sleeve and...
C415S170100, C415S174200, C416S205000, C384S581000, C417S423120
Reexamination Certificate
active
06565316
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a fan, and more particularly to an adjustable and stable pre-loading device equipped fan.
2. Description of the Prior Art
As shown in FIG.
1
(
a
), the conventional fan
10
includes a stator
20
, at least one bearing
30
, a rotor
50
, a shaft
60
and a spring
70
. The rotor
50
further includes a blade structure
55
. Besides, the shaft
60
couples the rotor
50
to the bearing
30
. As such, the shaft
60
enables the blade structure
55
of the rotor
50
to rotate. The shaft
60
passes through and compresses the spring
70
, and then is coupled to the bearing
30
. As such, the spring
70
applies a downward force, generally called pre-loading force, on the bearing
30
.
Referring to FIG.
1
(
a
) and FIG.
1
(
b
), the bearing
30
is positioned on the bottom of the stator
20
. In addition, the bearing
30
is composed of an inner ring
31
, a plurality of balls
32
and an outer ring
33
. The balls
32
couple the outer ring
33
to the outer periphery of the inner ring
31
. During the inner ring
31
rotates respective to the outer ring
33
, the balls
32
touch the inner ring
31
as well as the outer ring
33
and thus form the first contact
35
and the second contact
36
, respectively. However, the prior art suffers from the problem that the pre-loading force is unstable. For example, the contacts may shift and the pre-loading force fails to be kept constant. The problem and the reason are described in detail as follows. The blade structure
55
may move vertically or horizontally due to some reasons, such as the flow disturbs the blade structure
55
. In this case, the spring
70
maybe sometimes compressed and sometimes relaxed. As such, the spring
70
fails to apply constant pre-loading force on the bearing
30
, and the first contact
35
and the second contact
36
do not stay at the same positions. As a result, the fan suffers form shake, noise and abrasion.
Besides, prior art fails to adjust the pre-loading force according to the requirement of the user since the spring
70
has been formed previously and thus has no adjustable elastic coefficient.
Accordingly, there has been a strongly felt need for a novel fan having stable pre-loading to solve the above-mentioned problem. Besides, it is desired that the applied pre-loading force is adjustable.
SUMMARY OF THE INVENTION
The present invention discloses an adjustable and stable pre-loading device equipped fan. That is, according to the present invention, the pre-loading applied on the bearing of the fan is adjustable. The present fan includes a stator, an elastic device, a first bearing, a second bearing, a first rigid spacer, a second rigid spacer, a rotor and a shaft. Among these, the stator includes a receptacle having the first threads formed thereon formed on the opposite ends.
The first rigid spacer is positioned in the receptacle. The first bearing is formed in the receptacle and further on the first rigid spacer. The elastic device is formed in the receptacle and further on the first bearing. The second bearing is formed in the receptacle and further on the elastic device. The second rigid spacer is formed in the receptacle and further on the second bearing. That is, the elastic device is directly compressed by and sandwiched between the first bearing and the second bearing. In addition, the elastic device is indirectly compressed by and sandwiched between the first rigid spacer and the second rigid spacer. In this manner, the first rigid spacer compresses the elastic device by means of the first bearing. Then, the elastic device applies pre-loading force on the first bearing due to the reactive force. Likewise, the second rigid spacer compresses the elastic device by means of the second bearing. Then, the elastic device applies pre-loading force on the second bearing due to the reactive force.
The rotor includes a blade structure. The shaft includes a first terminal, an opposite second terminal and a middle section interposed therebetween. Since the first terminal is coupled to the rotor, the shaft is able to rotate the blade structure of the rotor. Besides, the middle section sequentially passing through the first rigid spacer, the elastic device and the second rigid spacer is coupled to the inner rings of the first bearing and the second bearing.
The first bearing and the second bearing are composed of an inner ring, a plurality of balls and an outer ring, respectively. The balls couple the inner ring to the outer ring. During the inner ring rotates respective to the outer ring, the balls contact the inner ring and the outer ring, respectively.
The balls couple the inner ring to the outer ring. Therefore, there is a first contact formed between the inner ring and the ball. Besides, there is a second contact formed between the outer ring and the ball. Since the first rigid spacer and the opposite second rigid spacer isolate the blade structure from the elastic device, the blade structure which may vibrates does not affect the elastic device.
The pre-loading force applied by the elastic device on the first bearing and the second bearing is adjustable since the first rigid spacer and the second rigid spacer are coupled to the receptacle movably. For example, the user may alter the distance d between the first rigid spacer and the second rigid spacer to adjust the pre-loading force. Alternatively, the user alters the turns that the first thread meshes with the second thread to adjust the pre-loading force. The pre-loading force that the elastic device applies on the bearing is proportional to the turns.
REFERENCES:
patent: 2953417 (1960-09-01), Horeberg
patent: 3329845 (1967-07-01), Lear
patent: 3746472 (1973-07-01), Rupp
patent: 3816782 (1974-06-01), Dow et al.
patent: 4164690 (1979-08-01), Muller et al.
patent: 4203704 (1980-05-01), Saint-Amand
patent: 4621977 (1986-11-01), Markwardt'
patent: 4719352 (1988-01-01), Miyatake et al.
patent: 4958945 (1990-09-01), Nakanishi
patent: 5997183 (1999-12-01), Horng
Delta Electronics , Inc.
Look Edward K.
McAleenan James M
LandOfFree
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