Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2003-03-28
2004-08-10
Le, Dang (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S090000, C310S254100
Reexamination Certificate
active
06774516
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a motor using a kinetic pressure bearing, and more particularly to a sealing structure for a motor using a kinetic pressure bearing, capable of improving quality and productivity by more completely preventing an oil provided for kinetic pressure generation and lubrication, from leaking out.
2. Description of the Related Art
In general, a small precision motor currently used, adopts a fluid kinetic pressure bearing for generating kinetic pressure by torque due to rotation of a motor in the inside of a bearing so that a rotor floats above a stator and rotates, and for heat-resisting and abrasion-resisting properties.
FIG. 1
is a cross-sectional view of a motor using a kinetic pressure bearing of the related art, and
FIG. 2
is an exploded, cross-sectional view of a sealing structure for a motor using a kinetic pressure bearing of the related art.
The motor of the related art, consists of: a cylinder shaped bearing
104
fixed on a base plate
102
; a stator
106
fixed on the outer peripheral surface of the bearing
104
, and to which power supply is applied; a magnet
108
arranged, with a constant interval, above the outer peripheral surface of the stator
106
, for being rotated by interaction with the stator
106
; a rotor
110
on which the magnet
108
is fixed and positioned on the upper side of the bearing; a shaft
112
inserted into the bearing
104
and fixed on the rotor
110
in its upper end, for supporting the rotor
110
so that the rotor is rotatable, and for generating kinetic pressure while being rotated in the interior of the bearing
104
; a sealing unit
120
mounted on the lower end of the bearing, for preventing an oil provided to the interior of the bearing
104
, from leaking out.
The sealing unit
120
is fixed on the lower end of the bearing
104
by caulking process, and consists of: a cover plate
114
having an air exhausting hole
116
for discharging an air of the interior of the bearing
104
, to the outside; a bending member
118
adhered to the back side of the cover plate
114
, for preventing leakage of an oil by sealing the air exhausting hole
116
.
Assembling process for the sealing unit of the related art having the foregoing construction, will be descried with reference to FIG.
2
.
A cover plate
114
is fit into the bearing
104
and fixed by caulking process. After sufficient amount of oil is provided to the interior of the bearing
104
, a shaft
112
fixed on the rotor
110
is inserted into the interior of the bearing
104
. At the moment, oil except the oil necessary for lubrication and kinetic pressure generation in the interior of the bearing
104
, is exhausted together with the air in the interior of the bearing
104
, to the outside through the air exhausting hole
116
.
After that, the oil exhausted through the air exhausting hole
116
and stuck on the cover plate
114
, is wiped away, and the bending member
118
is processed by heat fusion in order to seal the air exhausting hole
116
, so that leakage of the oil in the interior of the bearing
104
to the outside, is prevented and at the same time, inflow of external air is prevented.
But, in the sealing structure for the motor using the kinetic pressure bearing of the related art as descried above, as the air exhausting hole remains exposed to the outside, there may exist a danger of incomplete hardening of the bending member due to mixture of the oil and the bending member upon heat fusion of the bending member. Additionally, due to such incomplete hardening, problems that adhesive force of the bending member is deteriorated and the oil in the interior of the bearing leaks out to the outside, or external air penetrates into the interior of the bearing, seriously spoiling the bearing, deteriorating performance of the motor, are generated.
Also, a problem that the bending member flows into the interior of the bearing through the air exhausting hole, upon heat fusion of the bending member, and is mixed with the oil, deteriorating lubrication performance, thereby shorting life of the motor due to abrasion, is generated.
SUMMARY OF THE INVENTION
To solve the above-indicated problems, it is, therefore, an object of the present invention to provide a sealing structure for a motor using a kinetic pressure bearing, capable of improving productivity through reduction in assembling time by modifying a sealing structure of a bearing, and of improving life and performance of a motor by more effectively preventing oil in the interior of the bearing from leaking out to the outside.
The foregoing and other objects and advantages are realized by providing a sealing structure for a motor using a kinetic pressure bearing including: a bearing fixed on a base plate; a stator arranged on an outer peripheral surface of the bearing; a rotor arranged, with constant interval, on an outer peripheral surface of the stator; a shaft inserted into the bearing, and fixed in the rotor; a cover plate fixed on a lower end of the bearing, and having an air exhausting hole for discharging an air in an interior of the bearing to an outside; a first plate fit into a back side of the cover plate, for sealing the air exhausting hole; a packing member stuck on a back side of the first plate, for preventing leakage of an oil; a second plate fixed on a back side of the packing member, for protecting the packing member.
It is a preferable aspect of the present invention that a sealing is fit between a back side of the bearing and the cover plate, for preventing oil from leaking out to a gap between the bearing and the cover plate.
It is another preferable aspect of the present invention that the cover plate has a fitting portion so that the first plate, the packing member and the second plate are sequentially fit, respectively, in a back side of a cylindrical shape.
It is yet another preferable aspect of the present invention that the fitting portion is of a cylindrical shape having a predetermined length and is fixed by heat fusion after the first plate, the packing member and the second plate are fitted.
It is another preferable aspect of the present invention that the cover plate is manufactured by metal or synthetic resin.
It is another preferable aspect of the present invention that the first and the second plates are manufactured in form of a cylindrical shape having a predetermined thickness and made of metal or synthetic member.
It is another preferable aspect of the present invention that the packing member is manufactured by rubber material having a predetermined elasticity.
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Darby & Darby
Elkassabgi Heba
Le Dang
Samsung Electro-Mechanics Co. Ltd.
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