US20130224057A1 - Manufacturing method of bearing device - Google Patents
Manufacturing method of bearing device Download PDFInfo
- Publication number
- US20130224057A1 US20130224057A1 US13/590,199 US201213590199A US2013224057A1 US 20130224057 A1 US20130224057 A1 US 20130224057A1 US 201213590199 A US201213590199 A US 201213590199A US 2013224057 A1 US2013224057 A1 US 2013224057A1
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- United States
- Prior art keywords
- cover
- desired perform
- perform
- bearing device
- forming
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
- B22F5/106—Tube or ring forms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
Definitions
- the disclosure relates to a manufacturing method of a bearing device, and particularly to a manufacturing method of a bearing device having good lubricant retention.
- bearings are widely used in spindle motors in devices, such as compact disc (CD) drivers, digital video disc (DVD) drivers, hard disk drivers, laser beam printers, floppy disk drivers or in heat-dissipation fans.
- Spindle motors require bearings with small size, high rotational accuracy and long life.
- a related bearing defines a bearing hole therein.
- a shaft is rotatably received in the bearing hole.
- Lubricant is often used between an inner circumferential surface of the bearing and an external circumferential surface of the shaft to reduce abrasion of the bearing and the shaft.
- the lubricant is prone to leak out of the related bearing so that the bearing cannot work normally due to lack of lubricant.
- lubricant retention becomes a problem in the related bearing.
- a related method for manufacturing a bearing comprises following processes of : (a1) manufacturing a bearing preform with a bearing hole therein; and (a2) defining a plurality of hydrodynamic pressure generating grooves in an inner surface of the bearing preform in the bearing hole by chemical etching or electrolysis electric discharge.
- the small size of the bearing results in difficulties particularly in the making of the grooves in the bearing hole of the bearing preform. This makes manufacturing of the bearing both time-consuming and expensive. Therefore, the related method is not suitable for mass-production of the bearing.
- FIG. 1 is an isometric, assembled view of a bearing device, according to a first embodiment.
- FIG. 2 is an exploded view of the bearing device of FIG. 1 .
- FIG. 3 is an inverted view of the bearing device of FIG. 2 .
- FIG. 4 is a longitudinally cutaway view of the bearing device of FIG. 1 used in a bearing sleeve.
- FIG. 5 is a longitudinally cutaway view similar to FIG. 4 , but shown from another aspect.
- FIG. 6 is a flow chart of a method employed in manufacturing a bearing device of FIG. 1 in accordance with the first embodiment of the present disclosure
- FIG. 7 is an isometric, longitudinally cutaway view of a bearing device, according to a second embodiment.
- the bearing device 100 includes a cylindrical body 10 and a cover 20 mounted on the body 10 .
- the body 10 defines an axial hole 17 extending through a top to a bottom thereof.
- the body 10 defines a recess 11 at a top thereof.
- the body 10 has a planar surface 110 and inclined surface 112 around the planar surface 110 in the recess 11 .
- the planar surface 110 is annular.
- a bottom of the body 10 defines an annular undercut 12 to have a guiding surface 13 .
- a diameter of the guiding surface 13 gradually decreases from top to bottom.
- a center of the bottom of the body 10 defines a through groove 15 to divide the bottom of the body 10 into two walls 14 .
- the through groove 15 is communicated with the axial hole 17 of the body 10 .
- the body 10 defines two vertical guiding grooves 16 at two side walls thereof.
- Each of the guiding grooves 16 has a bottom end communicating the through groove 15 and a top end adjacent to a middle portion of the body 10 .
- the body 10 defines a bore 18 communicating the axial hole 17 and the top end of one of the guiding grooves 16 .
- the body 10 can define two bores 18 each communicating the axial hole 17 and the top end of each guiding grooves 16 .
- the cover 20 includes a top circular wall 21 , and an annular wall 23 extending perpendicularly downward from a periphery of the top circular wall 21 .
- the circular wall 21 defines a central hole 210 .
- the circular wall 21 has an engaging surface 230 at a bottom thereof.
- the engaging surface 230 gradually decreases from outer edge to inner edge thereof.
- the bearing device 100 is received in a bushing 30 and to receive a shaft 40 extending through the axial hole 17 of the body 10 and the central hole 210 of the circular wall 21 .
- the bearing device 100 , the bushing 30 and the shaft 40 combine to a bearing assembly.
- the bushing 30 includes a bottom plate 32 and a sleeve 34 extending from a periphery of the bottom plate 32 .
- the walls 14 of the body 10 abut on the bottom plate 32 . Inner surfaces of the walls 14 and the bottom plate 32 together define a first storing room 50 .
- Outer surface of the walls 14 , inner surface of the sleeve 34 and the bottom plate 32 together define a second storing room 60 .
- Lubricant is filled in the first storing room 50 , the second storing room 60 and gaps between the body 10 and the shaft 40 .
- the cover 20 is mounted on the body 10 and received in the sleeve 34 .
- the lubricant is driven flowing from the first storing room 50 to the gap between the body 10 and the shaft 40 . Accordingly, a fluid dynamic pressure is generated in the gap between the body 10 and the shaft 40 to prevent the shaft 40 directly contacting the body 10 . Part of the lubricant flows out along the bore 18 and the corresponding guiding groove 16 to the second storing room 60 , and returns to the first storing room 50 via the through groove 15 .
- a manufacturing method of the bearing device 100 includes following steps of:
- step 301 providing a hollow mold (not shown), then injecting a feedstock of powder and molten binder into the mold under pressure, thus forming a desired perform of the body 10 and a desired perform of the cover 20 , the desired perform of the body 10 defining an axial hole 17 , two vertical guiding grooves 16 at two outer walls thereof, and a bore 18 communicating the axial hole 17 and the top end of one of the guiding grooves 16 .
- the molten binder of the feedstock is required to be easily removable by debinding or extraction.
- the binder can be polyethylene (PE).
- step 302 separating the binder from the desired perform of the body 10 and the desired perform of the cover 20 .
- step 303 sintering the desired perform of the body 10 and the desired perform of the cover 20 .
- step 304 performing a precision machining to the desired perform of the body 10 and the desired perform of the cover 20 , thereby forming the body 10 and the cover 20 .
- step 305 mounting the cover 20 on the body 10 and sintering the cover 20 and the body 10 together, thereby forming the bearing device 100 .
- the bearing device 100 is configured (i.e., structured and arranged) for mass-production by the method in accordance with the preferred embodiment of the present disclosure. Also, the bearing device 100 manufactured by the present method has good lubricant retention.
- a bearing device 200 in accordance with a second embodiment of the disclosure is shown.
- the bearing device 200 is similar to the bearing device 100 of the first embodiment.
- the difference of the bearing device 200 from the bearing device 100 of the first embodiment is that the cover 20 includes a guiding portion 25 extending downwards from an inner edge of the central hole 210 of the cover 20 .
- the guiding portion 25 prevents the lubricant from leaking out of the cover 20 .
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Sliding-Contact Bearings (AREA)
Abstract
A method for manufacturing a bearing device includes steps: providing a hollow mold, then injecting a feedstock of powder and molten binder into the mold under pressure, thus forming a desired perform of a cylindrical body and a desired perform of a cover; separating the binder from the desired perform of the body and the desired perform of the cover; sintering the desired perform of the body and the desired perform of the cover, thereby forming the body and the cover; and mounting the cover on the body, thereby forming the bearing device.
Description
- 1. Technical Field
- The disclosure relates to a manufacturing method of a bearing device, and particularly to a manufacturing method of a bearing device having good lubricant retention.
- 2. Description of the Related Art
- At present, bearings are widely used in spindle motors in devices, such as compact disc (CD) drivers, digital video disc (DVD) drivers, hard disk drivers, laser beam printers, floppy disk drivers or in heat-dissipation fans. Spindle motors require bearings with small size, high rotational accuracy and long life. A related bearing defines a bearing hole therein. A shaft is rotatably received in the bearing hole. Lubricant is often used between an inner circumferential surface of the bearing and an external circumferential surface of the shaft to reduce abrasion of the bearing and the shaft. However, the lubricant is prone to leak out of the related bearing so that the bearing cannot work normally due to lack of lubricant. Thus, lubricant retention becomes a problem in the related bearing.
- A related method for manufacturing a bearing comprises following processes of : (a1) manufacturing a bearing preform with a bearing hole therein; and (a2) defining a plurality of hydrodynamic pressure generating grooves in an inner surface of the bearing preform in the bearing hole by chemical etching or electrolysis electric discharge. However, the small size of the bearing results in difficulties particularly in the making of the grooves in the bearing hole of the bearing preform. This makes manufacturing of the bearing both time-consuming and expensive. Therefore, the related method is not suitable for mass-production of the bearing.
- Therefore, it is desirable to provide a manufacturing method of a bearing device having good lubricant retention and a long operating life.
- The components of the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the embodiments of the display device. Moreover, in the drawings, like reference numerals designate corresponding parts throughout several views.
-
FIG. 1 is an isometric, assembled view of a bearing device, according to a first embodiment. -
FIG. 2 is an exploded view of the bearing device ofFIG. 1 . -
FIG. 3 is an inverted view of the bearing device ofFIG. 2 . -
FIG. 4 is a longitudinally cutaway view of the bearing device ofFIG. 1 used in a bearing sleeve. -
FIG. 5 is a longitudinally cutaway view similar toFIG. 4 , but shown from another aspect. -
FIG. 6 is a flow chart of a method employed in manufacturing a bearing device ofFIG. 1 in accordance with the first embodiment of the present disclosure; -
FIG. 7 is an isometric, longitudinally cutaway view of a bearing device, according to a second embodiment. - Referring to
FIG. 1 , abearing device 100 in accordance with a first embodiment of the disclosure is shown. Thebearing device 100 includes acylindrical body 10 and acover 20 mounted on thebody 10. - Referring to
FIGS. 2 and 3 , thebody 10 defines anaxial hole 17 extending through a top to a bottom thereof. Thebody 10 defines arecess 11 at a top thereof Thebody 10 has aplanar surface 110 andinclined surface 112 around theplanar surface 110 in therecess 11. Theplanar surface 110 is annular. A bottom of thebody 10 defines anannular undercut 12 to have a guidingsurface 13. A diameter of the guidingsurface 13 gradually decreases from top to bottom. A center of the bottom of thebody 10 defines a throughgroove 15 to divide the bottom of thebody 10 into twowalls 14. The throughgroove 15 is communicated with theaxial hole 17 of thebody 10. Thebody 10 defines two vertical guidinggrooves 16 at two side walls thereof. Each of the guidinggrooves 16 has a bottom end communicating the throughgroove 15 and a top end adjacent to a middle portion of thebody 10. Thebody 10 defines abore 18 communicating theaxial hole 17 and the top end of one of the guidinggrooves 16. Alternatively, thebody 10 can define twobores 18 each communicating theaxial hole 17 and the top end of each guidinggrooves 16. - The
cover 20 includes a topcircular wall 21, and anannular wall 23 extending perpendicularly downward from a periphery of the topcircular wall 21. Thecircular wall 21 defines acentral hole 210. Thecircular wall 21 has anengaging surface 230 at a bottom thereof. Theengaging surface 230 gradually decreases from outer edge to inner edge thereof. When thecover 20 is mounted on thebody 10, theengaging surface 230 is correspondingly engaged on theinclined surface 112 of thebody 10. - Referring to
FIGS. 4 and 5 , in use, thebearing device 100 is received in a bushing 30 and to receive ashaft 40 extending through theaxial hole 17 of thebody 10 and thecentral hole 210 of thecircular wall 21. Thebearing device 100, thebushing 30 and theshaft 40 combine to a bearing assembly. Thebushing 30 includes abottom plate 32 and asleeve 34 extending from a periphery of thebottom plate 32. Thewalls 14 of thebody 10 abut on thebottom plate 32. Inner surfaces of thewalls 14 and thebottom plate 32 together define afirst storing room 50. Outer surface of thewalls 14, inner surface of thesleeve 34 and thebottom plate 32 together define asecond storing room 60. Lubricant is filled in thefirst storing room 50, thesecond storing room 60 and gaps between thebody 10 and theshaft 40. Thecover 20 is mounted on thebody 10 and received in thesleeve 34. - During rotation of the
shaft 40, the lubricant is driven flowing from thefirst storing room 50 to the gap between thebody 10 and theshaft 40. Accordingly, a fluid dynamic pressure is generated in the gap between thebody 10 and theshaft 40 to prevent theshaft 40 directly contacting thebody 10. Part of the lubricant flows out along thebore 18 and the corresponding guidinggroove 16 to thesecond storing room 60, and returns to thefirst storing room 50 via the throughgroove 15. A circumfluence of the lubricant flowing through thefirst storing room 50, the gap between thebody 10 and theshaft 40, thebore 18, theguiding groove 16, thesecond storing room 60 and the throughgroove 15 in sequence, prevents the lubricant from flowing to a top of thebody 10 and leaking out of thebearing device 100. - Referring to
FIG. 6 , a manufacturing method of the bearingdevice 100 includes following steps of: - step 301: providing a hollow mold (not shown), then injecting a feedstock of powder and molten binder into the mold under pressure, thus forming a desired perform of the
body 10 and a desired perform of thecover 20, the desired perform of thebody 10 defining anaxial hole 17, two vertical guidinggrooves 16 at two outer walls thereof, and abore 18 communicating theaxial hole 17 and the top end of one of the guidinggrooves 16. The molten binder of the feedstock is required to be easily removable by debinding or extraction. The binder can be polyethylene (PE). - step 302: separating the binder from the desired perform of the
body 10 and the desired perform of thecover 20. - step 303: sintering the desired perform of the
body 10 and the desired perform of thecover 20. - step 304: performing a precision machining to the desired perform of the
body 10 and the desired perform of thecover 20, thereby forming thebody 10 and thecover 20. - step 305: mounting the
cover 20 on thebody 10 and sintering thecover 20 and thebody 10 together, thereby forming thebearing device 100. - The
bearing device 100 is configured (i.e., structured and arranged) for mass-production by the method in accordance with the preferred embodiment of the present disclosure. Also, thebearing device 100 manufactured by the present method has good lubricant retention. - Referring to
FIG. 7 , abearing device 200 in accordance with a second embodiment of the disclosure is shown. Thebearing device 200 is similar to thebearing device 100 of the first embodiment. The difference of thebearing device 200 from thebearing device 100 of the first embodiment is that thecover 20 includes a guidingportion 25 extending downwards from an inner edge of thecentral hole 210 of thecover 20. The guidingportion 25 prevents the lubricant from leaking out of thecover 20. - It is to be further understood that even though numerous characteristics and advantages have been set forth in the foregoing description of the embodiment(s), together with details of the structures and functions of the embodiment(s), the disclosure is illustrative only; and that changes may be made in detail, especially in the matters of shape, size, and arrangement of parts within the principles of the disclosure to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
Claims (10)
1. A method for manufacturing a bearing device comprising:
providing a hollow mold, then injecting a feedstock of powder and molten binder into the mold under pressure, thus forming a desired perform of a body and a desired perform of a cover, the desired perform of the body defining an axial hole, a guiding groove at an outer side wall of the desired perform of the body, and a bore in a middle portion of the desired perform of the body to communicate the axial hole and the guiding groove;
separating the binder from the desired perform of the body and the desired perform of the cover;
sintering the desired perform of the body and the desired perform of the cover, thereby forming the body and the cover; and
mounting the cover on the body, thereby forming the bearing device.
2. The method of claim 1 , wherein polyethylene is used as a material of the binder of the feedstock.
3. The method of claim 2 , wherein the binder of the feedstock is removed by debinding or extraction.
4. The method of claim 1 , wherein a precision machining operation is performed on the desired perform of the body and the desired perform of the cover after the sintering process.
5. The method of claim 1 , wherein a sintering operation is performed on the cover and the body together after the mounting process.
6. The method of claim 1 , wherein the cover comprises a top circular wall and an annular wall extending downward from a periphery of the top circular wall.
7. The method of claim 6 , wherein the cover defines a central hole and comprises a guiding portion extending downwards from an inner edge of the central hole.
8. The method of claim 1 , wherein a bottom of the body defines a through groove to divide the bottom of the body into two walls, inner surfaces of the walls forming a first storing room communicating the axial hole and the through groove.
9. The method of claim 8 , wherein the bottom of the body defines an annular undercut to have a guiding surface, the guiding surface forming a second storing room to communicate the bottom end of the guiding groove to the through hole of the bottom of the body.
10. The method of claim 9 , wherein a diameter of the guiding surface of the body gradually decreases from top to bottom.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW101106039A TWI545273B (en) | 2012-02-23 | 2012-02-23 | Manufacturing method of bearing assembly |
TW101106039 | 2012-02-23 |
Publications (1)
Publication Number | Publication Date |
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US20130224057A1 true US20130224057A1 (en) | 2013-08-29 |
Family
ID=49003091
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/590,199 Abandoned US20130224057A1 (en) | 2012-02-23 | 2012-08-21 | Manufacturing method of bearing device |
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US (1) | US20130224057A1 (en) |
TW (1) | TWI545273B (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6453722B1 (en) * | 1998-06-11 | 2002-09-24 | Seagate Technology Llc | Integrated test system for a disc drive pivot bearing and actuator |
US20050117822A1 (en) * | 2003-12-02 | 2005-06-02 | Abin Chen | Bearing for heat dissipating fan |
US20070202000A1 (en) * | 2004-08-24 | 2007-08-30 | Gerhard Andrees | Method For Manufacturing Components |
US20080168654A1 (en) * | 2007-01-17 | 2008-07-17 | Foxconn Technology Co., Ltd. | Hydrodynamic bearing and method for manufacturing the same |
-
2012
- 2012-02-23 TW TW101106039A patent/TWI545273B/en not_active IP Right Cessation
- 2012-08-21 US US13/590,199 patent/US20130224057A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6453722B1 (en) * | 1998-06-11 | 2002-09-24 | Seagate Technology Llc | Integrated test system for a disc drive pivot bearing and actuator |
US20050117822A1 (en) * | 2003-12-02 | 2005-06-02 | Abin Chen | Bearing for heat dissipating fan |
US20070202000A1 (en) * | 2004-08-24 | 2007-08-30 | Gerhard Andrees | Method For Manufacturing Components |
US20080168654A1 (en) * | 2007-01-17 | 2008-07-17 | Foxconn Technology Co., Ltd. | Hydrodynamic bearing and method for manufacturing the same |
Also Published As
Publication number | Publication date |
---|---|
TW201335498A (en) | 2013-09-01 |
TWI545273B (en) | 2016-08-11 |
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Legal Events
Date | Code | Title | Description |
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AS | Assignment |
Owner name: FOXCONN TECHNOLOGY CO., LTD., TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:CHUNG, MING-HSIU;CHENG, NIEN-TIEN;REEL/FRAME:028816/0336 Effective date: 20120816 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |