WO2005078291A1 - 流体動圧軸受の作動流体注入装置、方法および流体動圧軸受の製造方法 - Google Patents
流体動圧軸受の作動流体注入装置、方法および流体動圧軸受の製造方法 Download PDFInfo
- Publication number
- WO2005078291A1 WO2005078291A1 PCT/JP2005/002492 JP2005002492W WO2005078291A1 WO 2005078291 A1 WO2005078291 A1 WO 2005078291A1 JP 2005002492 W JP2005002492 W JP 2005002492W WO 2005078291 A1 WO2005078291 A1 WO 2005078291A1
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- WO
- WIPO (PCT)
- Prior art keywords
- working fluid
- opening
- housing
- gap
- shaft
- Prior art date
Links
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/10—Sliding-contact bearings for exclusively rotary movement for both radial and axial load
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/04—Sliding-contact bearings for exclusively rotary movement for axial load only
- F16C17/045—Sliding-contact bearings for exclusively rotary movement for axial load only with grooves in the bearing surface to generate hydrodynamic pressure, e.g. spiral groove thrust bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/06—Sliding surface mainly made of metal
- F16C33/10—Construction relative to lubrication
- F16C33/1025—Construction relative to lubrication with liquid, e.g. oil, as lubricant
- F16C33/103—Construction relative to lubrication with liquid, e.g. oil, as lubricant retained in or near the bearing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/06—Sliding surface mainly made of metal
- F16C33/10—Construction relative to lubrication
- F16C33/1025—Construction relative to lubrication with liquid, e.g. oil, as lubricant
- F16C33/106—Details of distribution or circulation inside the bearings, e.g. details of the bearing surfaces to affect flow or pressure of the liquid
- F16C33/107—Grooves for generating pressure
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49636—Process for making bearing or component thereof
- Y10T29/49639—Fluid bearing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49636—Process for making bearing or component thereof
- Y10T29/49696—Mounting
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49636—Process for making bearing or component thereof
- Y10T29/49702—Lubricating
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/53—Means to assemble or disassemble
- Y10T29/53104—Roller or ball bearing
Definitions
- the present invention relates to a working fluid injection device and method for a fluid dynamic bearing, and a method for manufacturing a fluid dynamic bearing.
- Patent Document 1 to Patent Document 3 Conventionally, as a method for injecting a working fluid into a fluid dynamic pressure bearing used for a recording medium driving device or the like, for example, the method disclosed in Patent Document 1 to Patent Document 3 is known.
- the working fluid injection method disclosed in Patent Documents 13 to 13 is also a vacuum injection method with a V ⁇ deviation
- the method disclosed in Patent Document 1 is an injection tube that is connected to a gap between a housing and a shaft in an airtight state. After evacuating the air by depressurizing the gap between the housing and the shaft and the inside of the injection tube, immersing the open end of the injection tube in the liquid surface of the working fluid, and then releasing the surrounding depressurized state In this way, the working fluid is sucked and raised into the gap between the injection tube and the housing, the housing and the shaft of which pressure has been reduced.
- Patent Document 3 discloses a method in which a bearing unit in which an annular concave portion having a volume equivalent to an appropriate amount is formed at an open end of a gap between a housing and a shaft is arranged in a reduced pressure state. After evacuating the internal air and dropping the working fluid in the concave portion in the depressurized state and storing the working fluid, the depressurized state is released, so that the working fluid stored by utilizing the pressure difference between the inside and the outside of the bearing unit is released. It is a method of injecting into the gap of the unit.
- Patent Document 1 JP-A-2002-168394 (Page 4, FIG. 1, etc.)
- Patent Document 2 Japanese Patent Application Laid-Open No. 2002-5170 (Page 3, FIG. 1, etc.)
- Patent Document 3 Japanese Patent Application Laid-Open No. 2002-174243 (Page 3, FIG. 3, etc.)
- the working fluid injection method of Patent Document 1 only needs to be able to maintain the interior of the bearing unit and the injection tube in a high vacuum state.
- the air remaining inside is injected into the bearing unit together with the working fluid.
- the pipe including the injection tube is compared with the volume of the gap in the bearing unit. The problem becomes significant because the volume of the road becomes overwhelmingly large.
- the working fluid injection method of Patent Document 3 has a disadvantage that a recess capable of storing an appropriate amount of working fluid must be formed in the bearing unit in advance. That is, the concave portion is used only when the working fluid is injected, and is unnecessary when the fluid dynamic bearing is used. Therefore, the concave portion cannot be used if there is no design margin.
- the same amount of working fluid as the total volume of the gap is stored in the recess, ideally, all of the stored working fluid is injected into the gap, so that subsequent wiping is considered unnecessary.
- Force Actually there is a possibility that a part of the working fluid at the ring-shaped open end is first partially sucked into the gap, and air is sucked into the gap from there.
- the present invention has been made in view of the above-described circumstances, and does not allow air bubbles to be mixed into minute gaps of a bearing unit and also prevent splashing of a working fluid around. It is an object of the present invention to provide a working fluid injection device and method of a fluid dynamic bearing capable of filling a working fluid in a simple process, and a method of manufacturing the fluid dynamic bearing.
- the present invention provides the following means.
- the present invention is an apparatus for injecting a working fluid into a gap between a housing and a shaft of a bearing unit, which has a force, and a housing having an opening and one end of which is exposed in the housing and having a force applied thereto.
- a storage portion that is arranged so as to expose the open portion in contact with an upper surface of the housing with the open portion of the ring-shaped gap in the open portion facing upward, and that is capable of storing a working fluid above the open portion.
- An exhaust device for reducing the pressure of the working fluid, a reservoir for storing the working fluid, and a working fluid stored in the reservoir in the chamber in the reduced pressure.
- the exhaust unit is placed in the chamber, the valve is closed, the chamber is closed, and the exhaust device is operated. Then, the air in the internal space of the chamber is exhausted, and the inside of the chamber is placed in a reduced pressure state.
- the dispenser is operated in the chamber, and the working fluid is dropped from the reservoir into the storage portion formed by the cover member above the ring-shaped opening. The dropped working fluid is stored in the storage unit so as to close the ring-shaped opening.
- the valve is opened to gradually increase the pressure in the chamber to the atmospheric pressure, so that the pressure difference between the inside and outside of the bearing unit causes the working fluid stored in the storage section to flow from the ring-shaped opening section into the gap. Will be injected.
- the storage portion for temporarily storing the working fluid is formed in the upper portion of the housing by the cover member, an appropriate amount that does not require a special recess in the bearing unit is provided.
- working fluid can be injected.
- the working fluid is dropped directly to the open end of the gap without using an injection tube, there is no inconvenience that air is mixed into the working fluid even if the working fluid is injected under a relatively low pressure. Therefore, the time during which the chamber is depressurized can be shortened, and the production efficiency can be improved. Also, decrease Since the working fluid is injected into the pressurized gap, air bubbles are not broken at the time of injection, and scattering of the working fluid can be prevented.
- the shaft is provided such that one end thereof is protruded outward with an opening force of the housing, and the storage portion is a ring formed between the protruding outer peripheral surface of the shaft and the cover member.
- U preferably formed in a shape.
- the cover member includes a lower opening larger than the opening, and a tapered inner surface in which the lower opening force gradually increases upward.
- the taper angle force of the inner surface of the taper is preferably 45 to 75 °, more preferably 55 to 65 °, and still more preferably 60 °.
- the inside of the reservoir storing the working fluid may be arranged in a reduced pressure state.
- the working fluid stored in the reservoir has the mixed air removed in advance, and prevents the working fluid from appearing as bubbles after being injected into the bearing unit. it can.
- the pressure in the chamber is gradually reduced from a reduced pressure state to an atmospheric pressure state over a period of 10 to 50 seconds, preferably 20 to 40 seconds, and more preferably 25 to 35 seconds. You could even have a controller to control the valve to raise it!
- a working fluid is injected into a clearance between the shaft and a housing of a bearing unit including a housing having an opening and a shaft housed in the housing with one end exposed from the opening. Arranging an open portion of the opening between the ring-shaped gaps in the opening upward, and a cover member forming a storage portion capable of storing a working fluid above the open portion with a housing upper surface. Disposing the bearing unit in a depressurized state, exhausting the air in the gap, and, after exhausting the air in the gap, dropping a working fluid into the reservoir under a reduced pressure atmosphere.
- a method for injecting a working fluid into a fluid dynamic bearing comprising: a step of storing the working fluid; and a step of releasing the depressurized state of the bearing unit while the working fluid is stored. Subjected to.
- the cover member is placed on the upper surface of the housing, and the working fluid is temporarily stored in the storage portion formed by the cover member. Therefore, a special recess or the like is formed in the bearing unit. It is possible to inject an appropriate amount of working fluid into the clearance of the bearing unit without performing the operation.
- the step of releasing the reduced pressure state may be gradually performed over a period of 10 to 50 seconds, preferably 20 to 40 seconds, and more preferably 25 to 35 seconds. I like it.
- the step of dropping and storing the working fluid may include storing the working fluid in an amount larger than the total volume of the gap.
- the working fluid force S remains between the inner surface of the introducer and the shaft. That is, it is possible to prevent a problem that the working fluid is cut off at the opening portion of the gap during the injection of the working fluid and air is mixed into the gap.
- the present invention constitutes a bearing unit in which an opening force of a housing is also exposed at one end of the shaft by inserting a shaft into the housing with a gap therebetween, and an opening of the housing is provided.
- An opening portion of the ring-shaped gap formed between the shaft and the shaft exposed from the opening portion is arranged upward, and a working fluid can be stored above the opening portion.
- the cover member constituting the unit is placed in contact with the upper surface of the housing, and the bearing cut is depressurized to exhaust the air in the gap.
- a method of manufacturing a fluid dynamic bearing is provided in which the working fluid is dropped and stored in the storage section, and the depressurized state of the bearing unit is released in a state where the working fluid is stored.
- the present invention it is possible to manufacture a fluid dynamic bearing in which a sufficient working fluid is filled in a minute gap between the housing and the shaft without mixing air.
- the fluid dynamic bearing manufactured by this manufacturing method since air is not mixed in the working fluid, deterioration of the bearing capacity such as generation of vibration and noise due to generation of bubbles is prevented, and durability is improved. Suitable use can be made possible.
- the decompression state is gradually released over a period of 10 to 50 seconds, preferably 20 to 40 seconds, and more preferably 25 to 35 seconds.
- a working fluid larger than the total volume of the gap is stored between the introduction tool and the shaft.
- the working fluid can be more easily and reliably injected into the fine gap between the housing, the housing, and the shaft. This has the effect that a fluid dynamic pressure bearing with low dynamics and noise can be manufactured.
- FIG. 1 is an overall configuration diagram schematically showing an oil injection device according to one embodiment of the present invention.
- FIG. 2 is a view showing a state where a mounting table is lowered in the oil injection device of FIG. 1.
- FIG. 3 is a longitudinal sectional view showing a bearing unit for injecting oil by the oil injection device of FIG. 1.
- FIG. 4 A bearing unit and a cover member are mounted on the mounting table of the oil injection device of FIG. It is a longitudinal cross-sectional view showing the state arrange
- FIG. 5 is a longitudinal sectional view showing a decompressed state in which oil is stored in a storage portion formed above an open portion of a clearance of the bearing unit in FIG. 3.
- FIG. 6 is a longitudinal sectional view showing a state in which the depressurized state in FIG. 5 has been released.
- an oil injection device (a working fluid injection device, a manufacturing device) and an oil injection method of a fluid dynamic bearing according to an embodiment of the present invention will be described with reference to FIGS.
- a fluid dynamic bearing 3 in which oil 2 is injected by the oil injection device 1 will be described with reference to FIG.
- the fluid dynamic pressure bearing 3 includes, for example, as shown in FIG. 3, a shaft 4, a housing 5 accommodating the shaft 4, and a bearing unit 6 which is also strong.
- the shaft 4 is provided with a substantially cylindrical shaft 7 and a flange-shaped thrust bearing plate 8 projecting radially in the axial direction of the shaft 7.
- Dynamic pressure generating grooves (not shown) are formed on the outer peripheral surface 7a of the shaft body 7 and both end surfaces 8a in the thickness direction of the thrust bearing plate 8.
- the inner surface of the housing 5 is arranged with a small gap C therebetween. 2 (see Fig. 6).
- the no-housing 5 is composed of a no-housing main body 9 and a ring-plate-shaped upper plate 10 arranged so as to close the upper end opening.
- a no-housing main body 9 At the center of the upper plate 10, there is provided an opening 10a that penetrates one end of the shaft 4 and projects outside.
- the opening 10a is formed in a tapered inner surface shape whose diameter gradually increases as the internal force of the housing 5 also moves outward in the axial direction.
- a gap C between the shaft 4 and the housing 5 is opened to the outside by a ring-shaped opening 11 formed between the opening 10a of the upper plate 10 and the shaft 4.
- the oil injection device 1 is a device that injects the oil 2 from an open portion 11 of a gap C formed between the inner surface of the opening 10a and the outer circumferential surface 4a of the shaft 4.
- a fixed hole formed of a screw hole 12 for fixing a disc-shaped recording medium (not shown) to the shaft 4 is provided.
- a fixed part is provided.
- the oil injection device 1 for a fluid dynamic bearing includes a base 13, a channel 14 fixed to the base 13, and an air in the channel 14.
- a vacuum pump 15 exhaust device
- a valve 16 for opening and closing the internal space of the chamber 14 with respect to the external space
- a dispenser 17 having an emission port 17a in the chamber 14, and a supply to the dispenser 17
- a reservoir 18 for storing the oil 2 to be supplied
- a supply device 19 for bringing the bearing unit 6 formed by combining the shaft 4 and the housing 5 into and out of the chamber 14.
- reference numeral 20 denotes a flow control valve (controller) for controlling the flow rate of air sucked into the chamber 14 when the depressurized state is released
- reference numeral 21 denotes a filter
- reference numeral 22 denotes the inside of the chamber 14 by the vacuum pump 15 .
- the valve which is closed when the pressure is sufficiently reduced, 23 is a pressure gauge.
- the dispenser 17 has a structure in which the oil 2 in the reservoir 18 is pushed out by a plunger. You can do it.
- the internal space of the reservoir 18 is maintained in a reduced pressure state by a vacuum pump 15, and stores the oil 2 in a state where air dissolved in the oil 2 is discharged (degassed).
- Reference numeral 24 denotes a valve that is closed when the pressure in the reservoir 18 is sufficiently reduced, and reference numeral 25 denotes an atmospheric pressure in the reservoir 18 when the oil 2 in the reservoir 18 is supplied to the dispenser 17.
- 26 is a flow control valve, and 27 is a filter.
- the supply device 19 supplies the bearing unit 6 to the chamber 14 from a through hole 14 a provided on the bottom surface of the chamber 14, and passes the fluid dynamic pressure bearing 3 filled with oil 2 through the through hole 14 a.
- a mounting table 28 for mounting the bearing unit 6 and an elevating mechanism 29 for raising and lowering the mounting table 28 are provided so as to be taken out of the hole 14a.
- the mounting table 28 is provided with a flange 28a that is pressed against the lower surface of the chamber 14 with the bearing unit 6 inserted into the chamber 14.
- the flange 28a is provided with a seal member 30 such as an O-ring that is compressed when the flange 28a is pressed against the lower surface of the chamber 14 to seal the inside of the chamber 14.
- the elevating mechanism 29 includes, for example, a rod 31 having a mounting table 28 attached to the tip, a cylinder 32 for vertically moving the rod 31, and a guide sleeve 33 for supporting the movement of the rod 31. .
- the bearing unit 6 is mounted on the mounting table 28 with the adapter 34 and the cover member 35 assembled.
- the adapter 34 has a fitting hole 34a for fitting the outer surface of the housing 5 of the bearing unit 6 and a positioning hole 34b for fitting a boss 28b provided on the mounting table 28.
- the bearing unit 6 is arranged such that the ring-shaped opening 11 faces upward when fitted into the fitting hole 34a of the adapter 34.
- reference numeral 36 denotes a ball plunger that holds the adapter 34 in a state fitted to the boss 28b.
- Reference numeral 37 denotes a through-hole that allows a space formed inside the adapter 34 to communicate with the outside of the adapter 34.
- the cover member 35 is fixed to the upper part of the adapter 34 so that the upper force of the bearing unit 6 arranged in the fitting hole 34a of the adapter 34 is also applied thereto.
- the bearing unit 6 is held by the adapter 34 and the cover member 35 so as to be sandwiched from above and below.
- the cover member 35 is provided with a through hole 35a larger than the ring-shaped opening 11 at the center.
- the cover member 35 has a tapered inner surface 35b whose diameter is gradually increased upward from the through hole 35a.
- the taper angle of the tapered inner surface 35b is, for example, 60 ° with respect to the central axis. By setting the taper angle to 60 °, the oil 2 can smoothly flow along the tapered inner surface 35b toward the opening 11 of the gap.
- the taper angle is not limited to 60 °, but is preferably 45-75 °, and more preferably 55 ° -65 °!
- the back surface 35c of the tapered inner surface 35b of the cover member 35 rises obliquely upward from the upper surface 5a of the housing 5.
- the cover member 35 Only in a relatively narrow annular region of the inner peripheral edge of the through hole 35a, the upper surface 5a of the housing 5 constituting the bearing unit 6 comes into contact.
- reference numeral 38 denotes a communication groove for communicating a space surrounded by the cover member 35 and the adapter 34 to the outside.
- the bearing cutout passes through the central through hole 35a of the cover member 35.
- One end of the shaft 4 constituting 6 and the ring-shaped opening 11 are exposed upward.
- the exposed outer peripheral surface 4b of the shaft 4 and the tapered inner surface 35b of the cover member 35 constitute a ring-shaped storage section 39 above the open section 11.
- the volume of the storage section 39 is configured to be sufficiently larger than the total volume of the gap C in the bearing unit 6.
- the tapered inner surface 35 b is formed sufficiently larger than the outer diameter of the bearing unit 6.
- a funnel-shaped guide surface extending around the storage portion 39 is constituted by the tapered inner surface 35b, and even if the injection port 17a of the dispenser 17 is arranged at a position radially away from the open portion 11, the tapered inner surface is formed.
- the oil 2 can be transmitted to 35b and guided to the opening 11!
- the bearing unit 6 is assembled to the adapter 34 and the upper force is also covered.
- the mounting base 28 is mounted on the mounting base 28 by fitting the fitting hole 34b of the adapter 34 into the boss 28b of the mounting base 28.
- the operation of the ball plunger 36 fixes the adapter 34 so that it does not come off the mounting table 28.
- the elevating mechanism 29 is operated to raise the mounting table 28, and the bearing unit 6 covered with the cover member 35 is introduced into the chamber 14.
- an injection port 17a of the dispenser 17 directed downward is provided with a ring-shaped storage section 39 formed by a cover member 35 and an outer peripheral surface 4b of the shaft 4, as shown in FIG. It is arranged above.
- the inside of the chamber 14 is sealed by closing the valve 16, and the inside of the chamber 14 is depressurized by operating the vacuum pump 15.
- air is exhausted from all spaces communicating with the chamber 14, such as the gap C of the bearing unit 6, the internal space of the adapter 34 and the cover member 35, and the like.
- the pressure in the chamber 14 reaches a predetermined reduced pressure state, for example, about 70 mTorr (9.3 Pa)
- the dispenser 17 is operated to drop a predetermined amount of oil 2 on the cover member 35 as well. .
- the oil 2 is stored in the storage section 39, and the ring-shaped opening 11 is closed by the oil 2.
- the gap C in the housing 5 and the pressure in the reservoir 14 are balanced, the oil 2 does not enter the gap C due to surface tension and is kept in the storage section 39 in the storage state.
- the amount of air remaining inside is extremely small and does not remain as bubbles after the injection of the oil 2.
- the amount of oil 2 stored in the storage section 39 is sufficiently larger than the total capacity of the gap C, so that even if the oil 2 is injected into the entire gap C as shown in FIG. Will remain. Therefore, the oil 2 in the storage section 39 does not run out during the injection into the gap C, and the air is not sucked into the gap C.
- the cover member 35 placed on the bearing unit 6 allows the oil 2 to temporarily move above the open portion 11 of the gap C. Is formed, so that the shaft 4 that constitutes the bearing unit 6 and the nozzle 5 need to fill the entire gap C without forming a recess for holding the oil 2.
- An appropriate amount of oil 2 can be supplied to the gap C. Therefore, there is no need to provide a useless concave shape in the shaft 4 or the housing 5 that does not function when used as a bearing.
- a fluid dynamic pressure bearing 3 for a small magnetic disk which has no room for providing a useless structure in design, it is advantageous because the compact design can be achieved without waste.
- the oil 2 when the oil 2 is injected, the oil 2 is injected without passing through an injection tube or the like. Since the oil 2 is directly stored above the open portion 11 of the gap C, no air is mixed into the oil 2. Can be injected. As a result, air can be prevented from being mixed even in a relatively light vacuum state, so that the time required to depressurize the inside of the chamber 14 can be reduced and the working efficiency can be improved.
- the force described by taking 70 mTorr as an example of the reduced pressure state is not limited to this.
- the volume of the storage portion 39 formed between the tapered inner surface 35b and the outer peripheral surface 4b of the shaft 4 is reduced. Since it can be set to be sufficiently larger than the total volume of the gap C, it is possible to more reliably prevent air from being mixed into the gap C due to a shortage of the oil 2 in the storage section 39 during injection.
- the release of the reduced pressure state of the chamber 14 is performed slowly over a period of about 30 seconds.
- the oil 2 stored in the storage section 39 is sucked into the gap C in the housing 5, it is possible to more reliably prevent air from entering into the gap C, which prevents the surrounding air from being entrained.
- the time required for releasing the reduced pressure state is not limited to 30 seconds, but is preferably about 10 to 50 seconds, preferably about 20 to 40 seconds, and more preferably about 25 to 35 seconds.
- the oil 2 stored in the storage section 39 is sufficiently degassed by being decompressed in the reservoir 18 before being supplied to the storage section 39 by the dispenser 17, so that it is used as a bearing.
- the dispenser 17 so that it is used as a bearing.
- the cover member 35 placed on the upper surface of the housing 5 is tapered only by surface contact at a ring-shaped contact portion having a predetermined width, which does not contact the entire surface of the upper surface 5a of the housing 5. Since the back surface 35c of the inner surface 35b is separated from the upper surface 5a of the housing 5 at a predetermined angle, the spillage of the oil 2 from the storage portion 39 is limited to only the ring-shaped contact portion, and further leakage, for example, No, inconvenience of leaking to the outer peripheral surface of the housing 5 can be avoided.
- a ring-shaped reservoir 39 is provided between the tapered inner surface 35b of the cover member 35 and the outer peripheral surface 4b of the shaft 4 projecting from the opening 10a of the housing 5, Since the oil 2 is stored therein, it is possible to prevent the oil 2 from entering the screw hole 12 of the fixed portion formed on the end face of the shaft 4.
- the screw holes 12 need to be degreased in order to prevent loosening, and by preventing the oil 2 from entering the screw holes 12, the degreasing step can be omitted and the process is efficient.
- the gap C force does not generate bubbles, so that the oil 2 in the storage section 39 overflows and enters the screw hole 12. Not even.
- the storage portion 39 is formed on the entire inside of the tapered inner surface 35 b of the cover member 35.
- the force described as an example in which the bearing unit 6 for injecting the oil 2 has a thrust bearing plate 8 at an intermediate position in the axial direction is described.
- the present invention is not limited to this. Any other type of sealed fluid dynamic pressure with an opening 11 in the gap C It can be applied to bearings.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Sliding-Contact Bearings (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/589,388 US7905019B2 (en) | 2004-02-18 | 2005-02-17 | Working fluid injection apparatus for a fluid dynamic pressure bearing |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-041422 | 2004-02-18 | ||
JP2004041422A JP4525102B2 (ja) | 2004-02-18 | 2004-02-18 | 流体動圧軸受の作動流体注入装置、方法および流体動圧軸受の製造方法 |
Publications (1)
Publication Number | Publication Date |
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WO2005078291A1 true WO2005078291A1 (ja) | 2005-08-25 |
Family
ID=34857930
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2005/002492 WO2005078291A1 (ja) | 2004-02-18 | 2005-02-17 | 流体動圧軸受の作動流体注入装置、方法および流体動圧軸受の製造方法 |
Country Status (3)
Country | Link |
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US (1) | US7905019B2 (ja) |
JP (1) | JP4525102B2 (ja) |
WO (1) | WO2005078291A1 (ja) |
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JP4753378B2 (ja) * | 2004-09-07 | 2011-08-24 | セイコーインスツル株式会社 | 作動流体注入装置、作動流体注入方法および流体動圧軸受の製造方法 |
DE102009019936A1 (de) * | 2008-11-18 | 2010-05-20 | Minebea Co., Ltd. | Fluiddynamisches Lagersystem |
KR101077409B1 (ko) | 2009-07-21 | 2011-10-26 | 삼성전기주식회사 | 베어링 내에 오일을 주입하는 방법 |
JP2016194341A (ja) * | 2015-04-01 | 2016-11-17 | 日本電産株式会社 | 軸受製造方法 |
KR102315496B1 (ko) * | 2020-03-24 | 2021-10-20 | (주)케이에이씨 | 그리스 도포 장치 및 베어링 결합 장치 |
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JPH0914256A (ja) * | 1995-06-28 | 1997-01-14 | Quantum Corp | 流体潤滑剤を流体軸受に与えるための方法および装置 |
JP2002005170A (ja) * | 2000-06-20 | 2002-01-09 | Victor Co Of Japan Ltd | 流体軸受の粘性流体充填方法、モータ |
JP2002174243A (ja) * | 2000-12-11 | 2002-06-21 | Matsushita Electric Ind Co Ltd | 動圧軸受装置の製造方法および動圧軸受装置 |
JP2002213452A (ja) * | 2001-01-19 | 2002-07-31 | Koyo Seiko Co Ltd | 動圧軸受の製造方法 |
JP2003314791A (ja) * | 2002-04-18 | 2003-11-06 | Seiko Instruments Inc | 流体動圧軸受の流体注入装置 |
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JP2002168394A (ja) | 2000-11-29 | 2002-06-14 | Seiko Instruments Inc | 流体動圧軸受の流体注入装置 |
US7040019B2 (en) * | 2002-04-03 | 2006-05-09 | Ntn Corporation | Method and apparatus for manufacturing hydro dynamic bearing device |
US7043839B2 (en) * | 2002-10-31 | 2006-05-16 | Nidec Corporation | Method and apparatus for charging oil into fluid-dynamic-pressure bearings, spindle motor utilizing fluid-dynamic-pressure bearings, and signal record-and-playback device utilizing fluid-dynamic-pressure bearings |
JP2005098393A (ja) * | 2003-09-25 | 2005-04-14 | Nippon Densan Corp | 流体動圧軸受へのオイル充填方法 |
US7344002B2 (en) * | 2003-03-31 | 2008-03-18 | Minebea Co., Ltd. | Method and apparatus for filling the bearing gap of a hydrodynamic bearing with a lubricant |
JP2005036974A (ja) * | 2003-07-02 | 2005-02-10 | Nippon Densan Corp | 流体動圧軸受の製造方法 |
JP2005114051A (ja) * | 2003-10-08 | 2005-04-28 | Nippon Densan Corp | 流体動圧軸受の製造方法及び流体動圧軸受を用いたモータ |
JP4753378B2 (ja) * | 2004-09-07 | 2011-08-24 | セイコーインスツル株式会社 | 作動流体注入装置、作動流体注入方法および流体動圧軸受の製造方法 |
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2004
- 2004-02-18 JP JP2004041422A patent/JP4525102B2/ja not_active Expired - Fee Related
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2005
- 2005-02-17 US US10/589,388 patent/US7905019B2/en not_active Expired - Fee Related
- 2005-02-17 WO PCT/JP2005/002492 patent/WO2005078291A1/ja active Application Filing
Patent Citations (5)
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JPH0914256A (ja) * | 1995-06-28 | 1997-01-14 | Quantum Corp | 流体潤滑剤を流体軸受に与えるための方法および装置 |
JP2002005170A (ja) * | 2000-06-20 | 2002-01-09 | Victor Co Of Japan Ltd | 流体軸受の粘性流体充填方法、モータ |
JP2002174243A (ja) * | 2000-12-11 | 2002-06-21 | Matsushita Electric Ind Co Ltd | 動圧軸受装置の製造方法および動圧軸受装置 |
JP2002213452A (ja) * | 2001-01-19 | 2002-07-31 | Koyo Seiko Co Ltd | 動圧軸受の製造方法 |
JP2003314791A (ja) * | 2002-04-18 | 2003-11-06 | Seiko Instruments Inc | 流体動圧軸受の流体注入装置 |
Also Published As
Publication number | Publication date |
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JP4525102B2 (ja) | 2010-08-18 |
US7905019B2 (en) | 2011-03-15 |
US20070175704A1 (en) | 2007-08-02 |
JP2005233262A (ja) | 2005-09-02 |
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