U.S. patent application number 11/537988 was filed with the patent office on 2008-04-03 for hub structure associated with a shaft in a motor.
Invention is credited to Jui-Hung Cheng.
Application Number | 20080080976 11/537988 |
Document ID | / |
Family ID | 39261386 |
Filed Date | 2008-04-03 |
United States Patent
Application |
20080080976 |
Kind Code |
A1 |
Cheng; Jui-Hung |
April 3, 2008 |
HUB STRUCTURE ASSOCIATED WITH A SHAFT IN A MOTOR
Abstract
A hub associated with a shaft in a motor includes a hub, a metal
sleeve base and a shaft. The hub has a bush disposed at the center
of the inner side of a lateral wall thereof and the sleeve base is
inserted in and joined to the bush. The shaft has an end thereof is
joined to the bush and another end thereof extending outward from
the bush. The metal sleeve base provides an effect of more steadily
locating the shaft during a manufacturing process for the shaft
being joined to the hub. Hence, it secures the rotational center of
the shaft aligns with the axial line of the hub without deviation
and the production cost is saved substantially.
Inventors: |
Cheng; Jui-Hung; (Kaohsiung,
TW) |
Correspondence
Address: |
G. LINK CO., LTD.
3550 BELL ROAD
MINOOKA
IL
60447
US
|
Family ID: |
39261386 |
Appl. No.: |
11/537988 |
Filed: |
October 2, 2006 |
Current U.S.
Class: |
416/174 |
Current CPC
Class: |
F04D 25/062 20130101;
F04D 29/329 20130101 |
Class at
Publication: |
416/174 |
International
Class: |
F04D 29/04 20060101
F04D029/04 |
Claims
1. A hub associated with a shaft in a motor, comprising: a hub,
having a fan wheel shell with a circular lateral wall and having a
bush being disposed at the center of the inside of the lateral
wall; a metal sleeve base, being disposed in the bush, providing a
circular base plate with a sleeve section extending from the base
plate, the circular base plate having an outer diameter being
greater than that of the sleeve section; and a shaft with two end,
one of the end being inserted into and joined to a center hole of
the bush and another one of the ends extending outward axially.
2. The hub associated with a shaft in a motor as defined in claim
1, wherein the sleeve base provides a flange at a lateral side
thereof opposite to the base plate and the bush provides an annular
recess corresponding to the flange.
3. The hub associated with a shaft as defined in claim 1, wherein
the metal sleeve base has hardness less than the shaft.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention is related to a hub structure in a
motor and particularly to a hub structure associated with a shaft
in a motor.
[0003] 2. Brief Description of the Related Art
[0004] Referring to FIG. 1, the conventional hub structure
associated with a shaft in a motor 1 provides a hub 11 with a fan
wheel shell 111 and a bush 12 is provided at the lateral side of
the fan wheel shell 111 for being joined to an end of the
shaft.
[0005] While the preceding conventional hub 11 is fabricated to
join the shaft 13, the shaft 13 is perpendicularly placed in a
preset position of a bush 112 in a hub mold (not shown) precisely.
Finally, plastic material is injected to the hub mold by means of
injection molding to form the fan wheel shell 11 integrally
attached to the shaft 13 as shown in FIG. 1 to complete the
manufacturing process for joining the hub 11 and the shaft 13.
[0006] However, the preceding way to preset the shaft 13 in the hub
mold and to be joined to the bush 112 of the hub 11 with injection
molding is easy to result in the melt plastics flowing to press the
shaft 13 and even to deviate the shaft 13 in case of the pressing
force of the flowing plastics being excessively large without
staying the preset position. Hence, the rotational center of the
shaft 13 deviates an inclining angle .theta. with respect to the
axial line L of the hub 11 after the hub is joined to the shaft 13.
Under this condition, correction for the deviated shaft is required
to increase a lot of extra works in order to fix the deviation.
[0007] Referring to FIG. 2, another type of the conventional hub
structure associated with the shaft is illustrated. The second type
conventional hub structure associated with the shaft 2 shown in
FIG. 2 provides a motor shell 22 disposed at the inner surface of
the fan wheel shell 211 and a locating bush 221 is arranged at
center of the motor shell 22 for the shaft 23 capable of joining
the locating bush 221.
[0008] The preceding second type conventional hub structure 2 is
joined to the shaft 23 in a way of the shaft 23 being inserted into
the locating bush 221 to be riveted with the motor shell 22, then
the motor shell 22 with the shaft 23 being placed at a preset
position in a hub mold (not shown) horizontally, next, the hub 21
being formed with injection molding, and finally, the hub 21 being
cooled to join the motor shell 22 with the shaft 21 firmly. The
second type conventional hub structure 2 overcomes the deficiency
of the first type conventional hub structure I such that the shaft
23 is incapable of being pressed with the melt plastics and it is
not possible to happen deviation of the shaft 23.
[0009] However, the shaft 23 in the second type conventional hub
structure has to be joined to the motor shell 22 with rivets such
that a riveting tool has to be added to complicate the fabricating
process. Hence, extra labor hour cost and purchase cost of the
riveting tool increase expenditure of the production.
SUMMARY OF THE INVENTION
[0010] Accordingly an object of the present invention is to provide
a hub structure associated with a shaft in which a metal sleeve
base is provided between the hub and shaft, such that it secures
the shaft located at the rotational center without deviation from
the axial line of the hub and saves the production cost.
[0011] Another object of the present invention is to provide a
clamping device, which is detached easily while the CPU being
replaced.
[0012] In order to achieve the object, a hub associated with a
shaft in a motor according to the present invention includes a hub,
a metal sleeve base and a shaft. The hub has a bush disposed at the
center of the inner side of a lateral wall thereof and the sleeve
base is inserted in and joined to the bush. The shaft has an end
thereof is joined to the bush and another end thereof extending
outward from the bush. The metal sleeve base provides an effect of
more steadily locating the shaft during a manufacturing process for
the shaft being joined to the hub. Hence, it secures the rotational
center of the shaft aligns with the axial line of the hub without
deviation and it saves the production cost substantially.
BRIEF DESCRIPTION OF THE DRAWINGS
[0013] The detail structure, the applied principle, the function
and the effectiveness of the present invention can be more fully
understood with reference to the following description and
accompanying drawings, in which:
[0014] FIG. 1 is a sectional view of a conventional hub attached to
a shaft in a motor;
[0015] FIG. 2 is a sectional view of another conventional hub
attached to a shaft in a motor;
[0016] FIG. 3 is a disassembled perspective view of a preferred
embodiment of a hub structure associated with a shaft in a motor
according to the present invention;
[0017] FIG. 4 is a sectional view of the preferred embodiment of a
hub structure associated with a shaft in a motor according to the
present invention;
[0018] FIG. 5 is a disassembled perspective view of another
preferred embodiment of a hub structure associated with a shaft in
a motor according to the present invention; and
[0019] FIG. 6 is a sectional view of another preferred embodiment
of a hub structure associated with a shaft in a motor according to
the present invention.
DETAILED DESCRIPTION OF THE INVENTION
[0020] Referring to FIGS. 3 and 4, the first embodiment of a hub
structure associated with a shaft in a motor according to the
present invention includes a hub 31, a metal sleeve base 32 and a
shaft 33.
[0021] The hub 31 has an annular fan wheel shell 311 with a flat
circular lateral wall 3 10 and a bush 3 12 is integrally joined at
the center of the inner side of the lateral wall 310.
[0022] The sleeve base 32 is attached to the bush 312 and disposed
at the axial hole of the bush 312. Further, the sleeve base 32 has
a circular base plate 321 and a sleeve section 322 with a reduced
diameter extending from the base plate 321. In practice, the sleeve
base 32 is made of a metal with hardness less than the shaft
33.
[0023] The shaft 33 is inserted into the and joined to the sleeve
section 322 at an end thereof and another end of the shaft 33
extends outward the sleeve section 322. Because the shaft 33 is
made of metal with hardness greater than the sleeve base 32, better
joint between the shaft 33 and the sleeve base 32 can be obtained
effectively.
[0024] Referring to FIG. 4, in case of the shaft 33 being attached
to the hub 31, an end of the shaft 33 is joined to the sleeve
section 322 of the sleeve base to touch the base plate 321 first.
Then, the shaft 33 with the sleeve base 32 is placed in a preset
position of a hub mold (not shown) precisely. Finally, plastic
material is injected to the hub mold by means of injection molding
to form the fan wheel shell 31 integrally attached to the shaft 33
with the sleeve base 32 firmly.
[0025] As the foregoing, the metal sleeve base 32 is disposed
between the hub 31 and the shaft 33 is joined to the hub 31 via the
sleeve base 32 during the manufacturing process such that more
steady effect can be obtained substantially. It is noted that once
the plastic material is injected to hub mold, the plastic material
contacts with the sleeve base 32 instead of pushing the shaft 33 so
that phenomenon of the shaft becoming deviating or offsetting can
be avoided effectively. Hence, it is capable of assuring the
rotational center of the shaft 33 to align with the axial line L of
the hub 31 after the manufacturing process for the shaft 33 with
the sleeve base 32 being joined to the hub 31 is complete. Besides,
an end of the shaft 33 being simply inserted into the sleeve
section 322 is able to complete operation of the shaft being
attached to the sleeve base 32 without need of any other tool
devices such that it is less production cost and tool purchase cost
in addition to easy fabrication.
[0026] Referring to FIGS. 5 and 6, another embodiment of a hub
structure associated with a shaft in a motor according to the
present invention is illustrated. It is noted that same reference
numerals for the identical parts as the first embodiment are used
in the present embodiment. The present embodiment includes a hub
31, a metal sleeve base 32 and a shaft 33. The difference of the
present embodiment from the first embodiment is in that a flange
323 is arranged at a lateral side thereof opposite to the circular
base plate 321. The sleeve section 312 provides an annular recess
313 corresponding to the flange 323. In this way, the flange 323
enhances engagement between the metal sleeve base 32 and the hub 31
in addition to the base plate 321.
[0027] It is appreciated that the hub associated with the shaft in
a motor according to the present invention is capable structure
allowing the shaft is joined to the hub more steadily after being
fabricated to secure the rotational center of the shaft 33 being
aligning with the axial line of the hub 31. Meanwhile, the hub
structure associated with the shaft of the present invention is
capable of saving production cost.
[0028] While the invention has been described with referencing to
preferred embodiments thereof it is to be understood that
modifications or variations may be easily made without departing
from the spirit of this invention, which is defined by the appended
claims.
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