U.S. patent application number 11/367591 was filed with the patent office on 2007-02-22 for dynamic bearing manufacturing method.
This patent application is currently assigned to DELTA ELECTRONICS, INC.. Invention is credited to Wen-Shi Huang, Hsiu-Wei Wu.
Application Number | 20070039186 11/367591 |
Document ID | / |
Family ID | 37765115 |
Filed Date | 2007-02-22 |
United States Patent
Application |
20070039186 |
Kind Code |
A1 |
Wu; Hsiu-Wei ; et
al. |
February 22, 2007 |
Dynamic bearing manufacturing method
Abstract
A dynamic bearing manufacturing method including steps as
follow. A plate is provided and a plurality of grooves is formed on
a surface of the plate. The plate formed with grooves is rolled
into a hollow cylinder. The grooves are located on the inner
surface of the hollow cylinder, and thus to reduce cost of
manufacturing process.
Inventors: |
Wu; Hsiu-Wei; (Taoyuan
Hsien, TW) ; Huang; Wen-Shi; (Taoyuan Hsien,
TW) |
Correspondence
Address: |
BIRCH STEWART KOLASCH & BIRCH
PO BOX 747
FALLS CHURCH
VA
22040-0747
US
|
Assignee: |
DELTA ELECTRONICS, INC.
|
Family ID: |
37765115 |
Appl. No.: |
11/367591 |
Filed: |
March 6, 2006 |
Current U.S.
Class: |
29/898.04 ;
29/898.02; 29/898.051 |
Current CPC
Class: |
Y10T 29/49663 20150115;
F16C 33/14 20130101; F16C 2220/44 20130101; F16C 17/026 20130101;
B21D 53/10 20130101; Y10T 29/49639 20150115; F16C 2220/02 20130101;
Y10T 29/49643 20150115 |
Class at
Publication: |
029/898.04 ;
029/898.02; 029/898.051 |
International
Class: |
B21K 1/10 20060101
B21K001/10; B21D 53/10 20060101 B21D053/10 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 19, 2005 |
TW |
94128354 |
Claims
1. A dynamic bearing manufacturing method, comprising steps of:
providing a plate; forming a plurality of grooves on a surface of
the plate; and rolling the plate into a hollow cylinder, wherein
the grooves are located on the inner surface of the hollow
cylinder.
2. The method as claimed in claim 1, wherein the plate comprises
copper, metal or plastic.
3. The method as claimed in claim 1, wherein the plate comprises
two ends engaged to each other.
4. The method as claimed in claim 1, wherein each of the grooves
has a shape of fish bone, herringbone, boomerang, slanted line or
straight line.
5. The method as claimed in claim 1, wherein the grooves are formed
by a tool slitting the surface of the plate, or the grooves are
pressed by a punch machine, or the grooves are formed by injection
molding.
6. The method as claimed in claim 1, wherein the hollow cylinder is
disposed within a sleeve after the step of rolling the plate.
7. The method as claimed in claim 6, wherein the sleeve comprises
an axial hole, and the hollow cylinder is disposed within the axial
hole of the sleeve.
8. The method as claimed in claim 6, wherein the sleeve is formed
by a plurality of separable parts.
9. The method as claimed in claim 8, wherein the separable parts
for enclosing the dynamic bearing are assembled into the
sleeve.
10. A dynamic bearing manufacturing method, comprising steps of:
providing a plate having two corresponding ends capable of
connecting to each other; forming a plurality of grooves on a
surface of the plate; and connecting the two corresponding ends to
each other to form the dynamic bearing.
11. The method as claimed in claim 10, wherein the dynamic bearing
comprises an inner hole, and the grooves are formed on a wall of
the inner hole.
12. The method as claimed in claim 10, wherein the plate comprises
copper, metal or plastic.
13. The method as claimed in claim 10, wherein each of the grooves
has a shape of fish bone, herringbone, boomerang, slanted line or
straight line.
14. The method as claimed in claim 10, wherein the grooves are
formed by a tool slitting the surface of the plate, or the grooves
are pressed by a punch machine, or the grooves are formed by
injection molding.
15. The method as claimed in claim 10, wherein the dynamic bearing
is disposed within a sleeve after the step of connecting the two
corresponding ends to each other to form the dynamic bearing.
16. The method as claimed in claim 15, wherein the sleeve comprises
an axial hole, and the dynamic bearing is directly disposed within
the axial hole of the sleeve.
17. The method as claimed in claim 15, wherein the sleeve is formed
by a plurality of separable parts.
18. The method as claimed in claim 17, wherein the separable parts
for enclosing the dynamic bearing are assembled into the sleeve.
Description
[0001] This Non-provisional Application claims priority under
U.S.C. .sctn. 119(a) on Patent Application No(s). 094128354, filed
in Taiwan, Republic of China on Aug. 19, 2005, the entire contents
of which are hereby incorporated by reference.
BACKGROUND
[0002] The invention relates to a method for producing a dynamic
bearing, and in particular to a method for forming grooves on a
plate, and following the plate being rolled into a cylindrical
bearing.
[0003] In general, a dynamic bearing for supporting a shaft of a
motor provides several miniature grooves formed on an inner wall
thereof for receiving oil. When the shaft is rotated, oil received
in the grooves spreads over the surface of the shaft by attraction
force to form a dynamic pressure to support the shaft at the center
of the dynamic bearing. Thus, friction between the shaft and the
inner wall of the bearing and noise can be reduced and reliability
of the motor can be increased.
[0004] However, forming grooves with desired width and depth on the
inner wall of the bearing is not easily controlled. Some methods,
such as tooling, rolling, plastic injection molding, erosion,
assembling and coating with post-manufacturing, require high skill
and precision and cost more than traditional methods, particularly
when trade secrets are involved.
[0005] The invention provides a method for producing a dynamic
bearing without using above described particular tools and machines
so as to reduce manufacturing costs.
SUMMARY
[0006] The invention provides a dynamic bearing manufacturing
method including steps as follow. A plate is provided and a
plurality of grooves is formed on a surface of the plate. The plate
formed with grooves is rolled into a hollow cylinder. The grooves
are located on the inner surface of the hollow cylinder, and thus
the cost of the manufacturing process can be reduced.
[0007] The plate prepared for the bearing is characterized by a
predetermined size, circumferential length and axial hole. The
plate is preferably made of flexible materials such as copper,
metal or plastic. If the plate is made of metal, the grooves can be
formed by a tool slitting the surface thereof, or the grooves can
be pressed by a punch machine. If the plate is made of plastic, the
grooves of the plate can be formed by injection molding.
[0008] The dynamic bearing is usually disposed within an axial hole
of a sleeve. On the other hand, a sleeve can be formed by a
plurality of separable parts, and thus the dynamic bearing can be
enclosed by the assembled parts.
DESCRIPTION OF THE DRAWINGS
[0009] The invention can be more fully understood by reading the
subsequent detailed description and examples with references made
to the accompanying drawings, wherein:
[0010] FIG. 1 is a schematic view of an embodiment of a plate for a
dynamic bearing of the invention.
[0011] FIG. 2 is a schematic view of the processed plate of FIG. 1,
wherein the processed plate is formed with grooves.
[0012] FIG. 3 is a schematic view of a hollow cylinder, where the
hollow cylinder is a dynamic bearing formed by the processed plate
of FIG. 2.
[0013] FIG. 4 is a schematic view of a sleeve, receiving the
dynamic bearing of FIG. 3.
[0014] FIG. 5 is a schematic view of the dynamic bearing clamped by
the sleeve, wherein the sleeve is formed by a plurality of
separable parts.
[0015] FIG. 6 is a schematic view of another embodiment of a plate
for a dynamic bearing of the invention.
[0016] FIG. 7 is a schematic view of the processed plate of FIG. 6,
wherein the processed plate is formed with grooves.
[0017] FIG. 8 is a schematic view of another processed plate formed
with grooves having a shape of herringbone.
DETAILED DESCRIPTION
[0018] In FIG. 1, a rectangular plate 1, preferably made of
flexible materials such as copper, metal or plastic, is prepared
for a bearing characterized by a predetermined size,
circumferential length and axial hole. In FIG. 2, the processed
plate is formed with a plurality of grooves 10 having a shape of
fish bone or can be formed to have other shapes. Note that the
grooves 10 of the metallic plate 1 can be formed by a tool slitting
the surface thereof, or the grooves can be pressed by a punch
machine. If the plate 1 is made of plastic, the grooves 10 of the
plate 1 can be formed by injection molding.
[0019] In FIG. 3, by rolling the processed plate 1 into a hollow
cylinder 1, a dynamic bearing 2 can be formed. The dynamic bearing
2 has an inner hole 20 to receive a shaft (not shown in Figs.), and
the grooves 10 are formed on a wall of the inner hole 20.
[0020] In FIG. 4, the dynamic bearing 2 is usually disposed within
an axial hole 30 of a sleeve 3. In FIG. 5, a sleeve 4 is formed by
a plurality of separable parts 4a and 4b, and thus the dynamic
bearing 2 can be enclosed by the assembled parts 4a and 4b.
[0021] The feature of the invention is that the grooves are
pre-formed on the surface of the plate, and then the plate formed
with the grooves is rolled into a hollow cylinder, i.e., a dynamic
bearing. As the result, no particular tools machines are required,
and cost can be reduced. Additionally, it is to be understood that
the shape of the plate 1 is not limited to the above-disclosed
embodiments. In a preferred embodiment, the plate can be formed
into the shape shown in FIG. 6, or the plate can be formed into any
shape where the ends thereof can be connected to each other during
the rolling process. The grooves 10 can also be formed to have
different shapes such as boomerang (FIG. 7), herringbone (FIG. 8),
slanted line or straight line.
[0022] While this invention has been described in connection with
what is presently considered to be the most practical and preferred
embodiment, it is to be understood that the invention is not
limited to the disclosed embodiments, but, on the contrary, is
intended to cover various modifications and equivalent arrangements
included within the spirit and scope of the appended claims.
* * * * *