CN1981962A - Method for manufacturing oil impregnated sintered bearing, and sizing pin to be used for the method - Google Patents
Method for manufacturing oil impregnated sintered bearing, and sizing pin to be used for the method Download PDFInfo
- Publication number
- CN1981962A CN1981962A CN 200610164715 CN200610164715A CN1981962A CN 1981962 A CN1981962 A CN 1981962A CN 200610164715 CN200610164715 CN 200610164715 CN 200610164715 A CN200610164715 A CN 200610164715A CN 1981962 A CN1981962 A CN 1981962A
- Authority
- CN
- China
- Prior art keywords
- shaping
- peripheral surface
- inner peripheral
- sintered body
- bearing
- Prior art date
- 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.)
- Pending
Links
Images
Abstract
The invention provides a method for manufacturing an oil impregnated sintered bearing, the method which adjusts a surface aperture rate of the inner peripheral surface of the sintered bearing at a low cost, and further to provide a sizing pin to be used for the method. On the outer peripheral surface of the sizing pin 12, a sizing surface (a large-diameter surface 13a) for sizing the inside peripheral surface 11a of a sintered body 11, a small-diameter surface 14a having a diameter smaller than the large-diameter surface 13a, and a stepped portion 15 connecting the large-diameter surface 13a and the small-diameter surface 14a, are provided. The sizing pin 12 configured as described above, is press-fitted into the inside peripheral surface 11a of the sintered body 11 from the side of the small-diameter portion 14 having the small-diameter surface 14a.
Description
Technical field
The present invention relates to make lubricant (lubricating oil or lubricating grease) to be impregnated into the manufacture method of the oil-containing sintered bearing in the porous body that constitutes by sintering metal.
Background technology
In the oil-containing sintered bearing, along with its relative rotation, be immersed in inner lubricated wet goods and ooze out and form oil film at the sliding part of oil-containing sintered bearing and axle with the axle that needs supporting, by this oil film axle is supported.
Usually, the following acquisition of this oil-containing sintered bearing, promptly, with the metal dust compression molding, and this press-powder formed body of sintering, sintered body formed thus, and then this sintered body is shaped into given size (for example, referring to patent documentation 1) with shaping pin (sizing pin) etc.
In addition, under the situation about in the spindle drive motor that information equipments such as this oil-containing sintered bearing being assembled in HDD is for example used, using,, on the inner peripheral surface of oil-containing sintered bearing, be formed with the dynamic pressure groove that produces mechanism as dynamic pressure in order to obtain higher running accuracy.In this situation, by after sintered body has been implemented the size shaping, further implementing the rotation shaping, adjust the surperficial percent opening (for example referring to patent documentation 2) of the inner surface that becomes radial bearing surface usually.
Patent documentation 1: the special fair 07-88521 communique of Japan
Patent documentation 2: Japanese kokai publication hei 11-182551 communique
In the size shaping process of routine, by the shaping pin is pressed into the sintered body inner peripheral surface, make the inner peripheral surface expansion, and by the sintered body inner peripheral surface that rubs with its outer peripheral face, the perforate part of confining surface.Therefore as mentioned above, under the surperficial percent opening of inner peripheral surface need being suppressed for lower situation, in a size shaping, be difficult to the surperficial percent opening of inner peripheral surface is reduced to the ratio of regulation.
In addition, shown in patent documentation 2,, then can reduce the surperficial percent opening of inner peripheral surface, still,, thereby cause with high costs inevitably because it causes the increase of operational sequence if except the size shaping of routine, also implement the rotation shaping.
Summary of the invention
Task of the present invention provide a kind of surperficial percent opening that can adjust inner peripheral surface at low cost the oil-containing sintered bearing manufacture method and be used for the shaping pin of this method.
In order to solve described problem, the invention provides a kind of manufacture method of oil-containing sintered bearing, its shaping pin is pressed into being compressed into that body carries out sintering of metal dust and the inner peripheral surface of sintered body, and inner peripheral surface is shaped into given size, form the oil-containing sintered bearing thus, it is characterized in that, be provided with at the outer peripheral face of shaping pin inner peripheral surface is carried out shaping surface, the footpath of the shaping little diametric plane littler than the footpath of shaping surface, and connects the stage portion of shaping surface and little diametric plane, the shaping pin is pressed into the interior week of sintered body from path face side.
In addition, in order to solve described problem, the invention provides a kind of shaping pin, it is used for by being pressed into the inner peripheral surface that body carries out the sintered body that sintering gets that is compressed into to metal dust, inner peripheral surface is shaped into given size, it is characterized in that, outer peripheral face be provided with to inner peripheral surface carry out shaping shaping surface, the footpath little diametric plane littler than the footpath of shaping surface, and connect the stage portion of shaping surface and little diametric plane, and the big footpath side corner sections of stage portion has the outside dimension of the inner peripheral surface that can be pressed into sintered body.
Usually, be used for the shaping pin of size shaping, be provided with the spigot surface that is used for shaping pin contraposition ground is imported the interior week of sintered body at its front end.Therefore, when being pressed into the shaping pin, spigot surface at first gently contacts with the inner peripheral surface of sintered body, expands the inner peripheral surface of sintered body at leisure, then by with the perforate on the sliding friction of outer peripheral face sealing inner peripheral surface surface.Relative therewith, in the present invention, be provided with at the outer peripheral face of shaping pin the inner peripheral surface of sintered body is carried out shaping surface, the footpath of the shaping little diametric plane littler than the footpath of shaping surface, and connects the stage portion of shaping surface and little diametric plane, the shaping pin is pressed into the inner peripheral surface of sintered body from path face side.Thus, can under the state of the contact angle of the inner peripheral surface that has improved relative sintered body, contact the bight, except the frictional force that produces by shaping surface, can also give the high frictional force that produces by the bight inner peripheral surface.Therefore, do not have the situation of the shaping pin of stage portion to compare with using, can reduce to have implemented the surperficial percent opening of the face of shaping with the footpath.Therefore, can not implement to rotate under the situation of shaping after the size shaping of routine, acquisition has reduced the oil-containing sintered bearing of the surperficial percent opening of inner peripheral surface, thereby can realize the reductionization of manufacturing cost.
Can form in the big footpath side corner sections of the stage portion of the outer peripheral face setting of shaping pin and for example to be the R section shape.According to described structure, the contact angle of the inner peripheral surface of the relative sintered body in the bight of shaping pin (R face) is the highest at internal side diameter, and along with slowly reducing to outside diameter, therefore the contact angle of relative sintered body inner peripheral surface can be kept higher, relax the resistance of pressing in of pin, thereby carry out be pressed into (shaping) of pin easily and accurately.
(invention effect)
Thus, according to the present invention, can provide a kind of surperficial percent opening that can adjust inner peripheral surface at low cost the oil-containing sintered bearing manufacture method and be used for the shaping pin of this method.
Description of drawings
Fig. 1 is the profilograph of the oil-containing sintered bearing of an embodiment of the present invention.
Fig. 2 is the profile that schematically shows an example of sintered body size trimming.
Fig. 3 is the amplification profile that schematically shows an example of sintered body size trimming.
Fig. 4 is the profile that schematically shows an example of sintered body size trimming.
Fig. 5 is the profile of a structure example that expression is assembled with the Hydrodynamic bearing apparatus of oil-containing sintered bearing.
Fig. 6 is the axial section that contains of oil-containing sintered bearing.
Symbol description
1 oil-containing sintered bearing
2
11 sintered bodies
The 11a inner peripheral surface
The 11b outer peripheral face
12 shaping pins
13 large-diameter portions
The 13a big diametral plane
14 minor diameter parts
The little diametric plane of 14a
15 stage portion
The big footpath of 15a side corner sections
16 moulds
17 upper punch
18 low punches
100 motor
101 Hydrodynamic bearing devices
102
103 dish hubs (disk hub)
104 stator coils
105 rotor magnets
106 carriages
107 oil-containing sintered bearings
The 107a inner peripheral surface
107a1,107a2 dynamic pressure groove
108 housings
109 seal members
The D dish
D1 outside dimension (shaping pin)
D2 internal diameter size (sintered body)
R1, R2 journal bearing portion
T1, T2 thrust bearing division
The specific embodiment
Below, according to Fig. 1-Fig. 4 first embodiment of the present invention is described.
Fig. 1 has represented the oil-containing sintered bearing of first embodiment of the invention.This oil-containing sintered bearing 1 is to be metal porous body cylindraceous, and portion is impregnated with lubricating oil within it.The bearing surface 1a that outer peripheral face (sliding surface) 2a with the axle 2 that needs supporting (single-point line among the figure) slides that is provided with in interior week at oil-containing sintered bearing 1.And when axle 2 rotation, lubricating oil oozes out from bearing inside via the surperficial perforate of the bearing surface 1a that slides with axle 2 outer peripheral face 2a.Thus,, form oil film, by described oil film supporting axle 2 and guarantee its rotation freely with high oil film pressure at the sliding part of axle 2 and oil-containing sintered bearing 1.
By will be for example Cu powder or Cu alloy powder, Fe powder, the metal dust compression moldings such as Fe powder that cover by Cu be press-powder forming process cylindraceous, the press-powder formed body of gained in the press-powder forming process carried out the sintering circuit of sintering and the sintered body of gained in the sintering circuit is exerted pressure size is shaped into the size trimming of given size with the regulation sintering temperature, make this oil-containing sintered bearing 1.Below, stress the size trimming.
Fig. 2 has schematically shown the processing unit (plant) that uses in trimming, in described trimming, the not oil-containing sintered-metal bearing of implementing before the size shaping (below, only be referred to as " sintered body ") 11 is shaped into given size.Processing unit (plant) in this embodiment is mainly by constituting with lower member, that is, the mould 16 of the outer peripheral face 11b of the shaping pin 12 of the inner peripheral surface 11a of the sintered body 11 of extrusion cylinder shape, extruding sintered body 11, and retrain first drift 17 (upper punch) and second drift 18 (low punch) of the axial both ends of the surface of sintered body 11 from above-below direction (axially).
Shaping pin 12 mainly comprises large-diameter portion 13 and is arranged on the minor diameter part 14 of the front of large-diameter portion 13.Be provided with stage portion 15 between large-diameter portion 13 and minor diameter part 14, its outer peripheral face with shaping pin 12 is divided into big diametral plane 13a and path face 14a.Wherein, all the internal diameter size than the inner peripheral surface 11a of sintered body 11 is big to become the outside dimension of big footpath side corner sections 15a of outer peripheral face (big diametral plane) 13a of large-diameter portion 13 of shaping surface and stage portion 15.Extruding allowance d1-d2 when in this embodiment, the value that has deducted the internal diameter size d2 gained of the sintered body 11 before the shaping from the outside dimension d1 of the big diametral plane 13a of large-diameter portion 13 is exactly shaping.In addition, the bight 15a of big footpath side is the R section shape, and the end face of stage portion 15 is connected via described section R curved surface smoothly with big diametral plane 13a.In addition, at the front end of minor diameter part 14, be provided with conical guide part 14b.
At first, as shown in Figure 2, will be configured on the upper surface of low punch 18 as the sintered body 11 of machined object.Mould 16 is contained in inside with the whole outer peripheral face 11b of sintered body 11, and with and outer peripheral face 11b between leave the outside diameter of the state configuration in gap slightly at sintered body 11.Shaping pin 12 is configured in axial top with upper punch 17 relative sintered bodies 11.
As shown in Figure 3, shaping pin 12 is descended, shaping pin 12 is pressed into the interior week of sintered body 11 from described state.At this moment, the outer peripheral face 11b of mould 16 restriction sintered bodies 11 is to the displacement of external diameter direction, and therefore by being pressed into of shaping pin 12, thereby the inner peripheral surface 11a of sintered body 11 and top layer part thereof are under pressure to the displacement of external diameter direction.Thus, the inner peripheral surface 11a of sintered body 11 is shaped into the internal diameter size (being the outside dimension d1 of shaping pin 12) of regulation at this.
At this moment, as shown in Figure 3, the big footpath side corner sections 15a of stage portion 15 contacts with the inner peripheral surface 11a of sintered body 11 earlier than big diametral plane (shaping surface) 13a of shaping pin 12.Therefore, comparing with the shaping pin of prior art under the state of the contact angle that has improved the relative inner peripheral surface 11a of bight 15a, inner peripheral surface 11a is to external diameter direction expansion, and with the rub inner peripheral surface 11a of sintered body 11 of bight 15a.Thus, the inner peripheral surface 11a of sintered body 11 also is subjected to the high frictional force from bight 15a except being subjected to the frictional force from the big diametral plane 13a of large-diameter portion 13.Therefore, can seal the surperficial perforate of inner peripheral surface 11a more, thereby can suppress the surperficial percent opening after the size shaping lower.
In addition, in this embodiment, owing to forming the shaping pin 12 that is the R section shape, the big footpath side corner sections 15a with stage portion 15 carries out shaping, therefore, the contact angle of the inner peripheral surface 11a of the relative sintered body 11 of the big footpath side corner sections 15a (R face) of shaping pin 12 is in the internal side diameter maximum, along with reducing gradually to outside diameter.Therefore, can obtain bight 15a to sintered body inner peripheral surface 11a friction and the high friction effect that produces, and the resistance when relaxing shaping pin 12 and being pressed into, thereby carry out the size shaping easily and accurately.In addition, because bight 15a forms fillet, therefore can reduce sintered body 11 or shaping pin 12 both sides' damage.Especially can prolong the life-span of the shaping pin 12 that continues use.
And, can be according to the size (R footpath) of the R face of the extruding allowance d1-d2 of shaping pin or big footpath side corner sections 15a etc., suitably adjust the surperficial percent opening of inner peripheral surface 11a.
As mentioned above shaping pin 12 is pressed into the interior week of sintered body 11, then as shown in Figure 4, the whole inner peripheral surface 11a of sintered body 11 is carried out shaping by big footpath side corner sections 15a and big diametral plane 13a.In addition, shaping pin 12 and upper punch 17 are descended together, upper punch 17 is contacted with the upper surface of sintered body 11.Thus, from axial both sides constraint sintered body 11, sintered body 11 is shaped into the axial dimension of regulation by last low punch 17,18.And, also can before carrying out shaping, retrain by 17,18 pairs of sintered bodies 11 of last low punch with 12 couples of inner peripheral surface 11a of shaping pin.
Though omitted diagram, after described operation is finished, keeping under the state that retrains with mould 16 and last low punch 17,18, mould 16 is descended, thereby remove pressure the internal diameter direction of sintered body 11.Then, shaping pin 12 is risen, thereby remove pressure the external diameter direction of sintered body 11.At last, upper punch 17 is risen, from this processing unit (plant), take out the sintered body 11 that is fixed on the shaping pin 12.Then, as required, back operation such as clean, final impregnating lubricating oil obtains the oil-containing sintered bearing 1 as finished product thus.
In addition, in said embodiment, the situation of under the internal diameter of mould 16 being arranged to than the big slightly state of the external diameter of sintered body 11 inner peripheral surface 11a being carried out shaping has been described, but, be not limited to this, for example also can before the shaping of inner peripheral surface 11a, outer peripheral face 11b be pressed into the inner peripheral surface 16a of mould 16, thereby the external diameter of sintered body 11 is shaped into given size.
More than Shuo Ming oil-containing sintered bearing can be assembled in the motor that for example information equipment is used and use.Below, the oil-containing sintered bearing is applied to the structure example of the bearing that described motor uses according to Fig. 5 and Fig. 6 explanation.
Fig. 5 represents to be assembled with the profile of the motor 100 of Hydrodynamic bearing device 101.The spindle drive motor that this motor 100 is used as disk drive devices such as for example HDD, this motor 100 comprise noncontact bolster 102 and guarantee freely Hydrodynamic bearing device 101 of its rotation, be assemblied in rotor (dish hub) 103 on the axle 102, and for example opposed stator coil 104 and rotor magnet 105 via the gap of radial direction.Stator coil 104 is installed in the periphery of carriage 106, and rotor magnet 105 is installed in the interior week of dish hub 103.Dish hub 103 upper supports have dish D such as or several disks.If to stator coil 104 energisings, then rotor magnet 105 thus, coils hub 103 and rotates with axle 102 one with the dish D that remains on the dish hub 103 by the rotation of the magnetic force between stator coil 104 and the rotor magnet 105.
In this embodiment, oil-containing sintered bearing 107 constitutes Hydrodynamic bearing device 101 with axle 102, housing 108 and seal member 109, inserts axle 102 at the interior all of oil-containing sintered bearing 107, and oil-containing sintered bearing 107 is fixed on the interior week of housing 108.Between the upper surface 108b1 of the bottom 108b of the lower surface of oil-containing sintered bearing 107 107b and opposed housing 108, be housed in the flange part 102b that axle 102 lower ends are provided with.
In all or part of cylinder zone of the inner peripheral surface 107a of oil-containing sintered bearing 107, form the zone that is arranged with as a plurality of dynamic pressure grooves of radial dynamic pressure generating unit.In this embodiment, for example shown in Figure 6, separately form two zones that a plurality of dynamic pressure groove 107a1,107a2 are arranged in the herringbone shape in the axial direction.
At all or part of annular section of the lower surface of oil-containing sintered bearing 107 107b, formation for example is arranged in spiral helicine zone with a plurality of dynamic pressure grooves and is used as the thrust dynamic pressure generating unit, omits diagram.
In the Hydrodynamic bearing device 101 of described structure, when axle 102 rotation, the dynamic pressure groove 107a1, the 107a2 that form on the inner peripheral surface 107a of oil-containing sintered bearing 107 form the zone, and the outer peripheral face 102a of opposed axle 102 between form the journal bearing gap.And along with the rotation of axle 102, the lubricating oil in described journal bearing gap is pressed into the axial centre side of dynamic pressure groove 107a1,107a2, thereby its pressure rises.So the dynamic pressure effect by the lubricating oil that produced by dynamic pressure groove 107a1,107a2 constitutes radially first R1 of journal bearing portion and second R2 of journal bearing portion of noncontact bolster 102 respectively.
Meanwhile, the lower surface of oil-containing sintered bearing 107 107b (the dynamic pressure groove forms the zone) and and the upper surface of its opposed flange part 102b between the thrust bearing gap, and the upper surface 108b1 of the bottom of housing 108 108b (the dynamic pressure groove forms the zone) and and the lower surface of its opposed flange part 102b between the dynamic pressure effect height of pressure ratio dynamic pressure groove of the lubricating oil film that forms of thrust bearing gap.And, by the pressure of these oil films, constitute respectively along the first thrust bearing division T1 and the second thrust bearing division T2 of the thrust direction noncontact support lug 102b of portion (axle 102).
Identical with described first embodiment, behind press-powder forming process, sintering circuit, size trimming,, form the oil-containing sintered bearing 107 of described structure through the forming process of dynamic pressure groove 107a1,107a2.In the case, though omitted diagram, but the outer peripheral face formation at plug (core rod) forms the corresponding concavo-convex finishing die (forming face) in zone with dynamic pressure groove 107a1,107a2, inner peripheral surface 107a to the section round type of oil-containing sintered bearing 107 exerts pressure with this plug, on the finishing die of plug, described inner peripheral surface 107a is pressurizeed and make it plastic deformation, thus, as shown in Figure 6, can be shaped dynamic pressure groove 107a1,107a2 form the zone.
In the case, form oil-containing sintered bearing 107, be suppressed to lower so become the surperficial percent opening of the inner peripheral surface 107a (for example bottom surface of dynamic pressure groove 107a1,107a2) of radial bearing surface owing to carrying out the size shaping identical with first embodiment.Thus, can under the situation that the oil film pressure that is produced by the described journal bearing R1 of portion, R2 is not escaped from the surperficial perforate of bearing surface, obtain high oil film rigidity (bearing rigidity).
Oil-containing sintered bearing 1,107 of the present invention is not limited to above illustration, its rotating shaft that can be used as various information equipments or office equipment supports the bearing of usefulness and uses widely, wherein especially as mentioned above, can suppress to use preferably as the surperficial percent opening that requires to become the inner peripheral surface of bearing surface for oil-containing sintered bearing lower, that Hydrodynamic bearing apparatus is used.Particularly, can be used as spindle drive motor with used for driving of magnetic disc such as described HDD be the miniature motor used of the information equipment that requires high running accuracy of representative for example the photomagneto disk of CD drive the spindle drive motor of usefulness or polyhedron scanner (polygon scanner) motor of laser beam printer etc. rotating shaft supporting usefulness bearing and preferably use.
Claims (3)
1. the manufacture method of an oil-containing sintered bearing, its shaping pin is pressed into being compressed into that body carries out sintering of metal dust and the inner peripheral surface of sintered body, and this inner peripheral surface is shaped into given size, form the oil-containing sintered bearing thus, it is characterized in that,
Be provided with at the outer peripheral face of described shaping pin described inner peripheral surface carried out shaping surface, the footpath of the shaping little diametric plane little than the footpath of this shaping surface, and the stage portion of described shaping surface of connection and described little diametric plane,
Described shaping pin is pressed into the interior week of described sintered body from described path face side.
2. shaping pin, it is used for by being pressed into the inner peripheral surface that body carries out the sintered body that sintering gets that is compressed into to metal dust this inner peripheral surface being shaped into given size, it is characterized in that,
Be provided with shaping surface, the footpath little diametric plane little, and the stage portion of described shaping surface of connection and described little diametric plane of described inner peripheral surface being carried out shaping at outer peripheral face, and the big footpath side corner sections of described stage portion has the outside dimension of the inner peripheral surface that can be pressed into sintered body than the footpath of this shaping surface.
3. shaping pin according to claim 2 is characterized in that,
Described big footpath side corner sections is the R section shape.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005290305 | 2005-10-03 | ||
| JP2005290305A JP2007100803A (en) | 2005-10-03 | 2005-10-03 | Method for manufacturing oil impregnated sintered bearing, and sizing pin to be used for the method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1981962A true CN1981962A (en) | 2007-06-20 |
Family
ID=38027957
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610164715 Pending CN1981962A (en) | 2005-10-03 | 2006-09-28 | Method for manufacturing oil impregnated sintered bearing, and sizing pin to be used for the method |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2007100803A (en) |
| CN (1) | CN1981962A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102356249A (en) * | 2009-03-19 | 2012-02-15 | Ntn株式会社 | Sintered metallic bearing and fluid dynamic bearing device equipped with the bearing |
-
2005
- 2005-10-03 JP JP2005290305A patent/JP2007100803A/en not_active Withdrawn
-
2006
- 2006-09-28 CN CN 200610164715 patent/CN1981962A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102356249A (en) * | 2009-03-19 | 2012-02-15 | Ntn株式会社 | Sintered metallic bearing and fluid dynamic bearing device equipped with the bearing |
| CN102356249B (en) * | 2009-03-19 | 2014-07-16 | Ntn株式会社 | Sintered metallic bearing and fluid dynamic bearing device equipped with the bearing |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2007100803A (en) | 2007-04-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10415573B2 (en) | Fluid-dynamic bearing device provided with a sintered metal bearing and a fan motor provided with the fluid-dynamic bearing device | |
| CN101410636B (en) | Dynamic pressure bearing device | |
| CN101663496B (en) | Method of producing dynamic pressure bearing | |
| WO2006085426A1 (en) | Housing for fluid bearing device, housing for dynamic pressure bearing device, and method of manufacturing the same | |
| US9732796B2 (en) | Sintered metal bearing and method for producing same | |
| JPH10306827A (en) | Dynamic pressure type oil-impregnated sintered bearing and manufacture thereof | |
| CN1981962A (en) | Method for manufacturing oil impregnated sintered bearing, and sizing pin to be used for the method | |
| JP2011047005A (en) | Method of manufacturing bearing sleeve and fluid dynamic bearing device | |
| JP2000087953A (en) | Dynamic pressure type sintered oil-retaining bearing unit | |
| JP2002276649A (en) | Dynamic pressure type bearing unit | |
| CN100406193C (en) | Method for producing thrust plate and method for producing shaft for hydrodynamic bearing | |
| JP4459669B2 (en) | Hydrodynamic bearing device | |
| JP2004340385A (en) | Dynamic pressure type bearing unit | |
| JP2019120389A (en) | Fluid dynamic pressure bearing device and motor including the same | |
| JP4188288B2 (en) | Manufacturing method of dynamic pressure type porous oil-impregnated bearing | |
| WO2023189389A1 (en) | Oil-impregnated sintered bearing and fluid dynamic bearing device including same | |
| JP6981900B2 (en) | Fluid dynamic bearing device and motor equipped with it | |
| JP2009014121A (en) | Dynamic pressure bearing device and its manufacturing method | |
| JP2008111520A (en) | Dynamic pressure bearing device | |
| JP7094118B2 (en) | Sintered metal dynamic pressure bearing | |
| JP3782900B2 (en) | Hydrodynamic bearing and hydrodynamic bearing unit | |
| JP4233771B2 (en) | Hydrodynamic bearing unit | |
| CN101128679B (en) | Fluid bearing device and method of manufacturing the same | |
| JP2005180707A (en) | Dynamic pressure type sintered oil-impregnated bearing unit | |
| JP2004308921A (en) | Dynamic pressure type bearing unit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |