WO2018225766A1 - 転がり軸受及び転がり軸受の製造方法 - Google Patents
転がり軸受及び転がり軸受の製造方法 Download PDFInfo
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- WO2018225766A1 WO2018225766A1 PCT/JP2018/021658 JP2018021658W WO2018225766A1 WO 2018225766 A1 WO2018225766 A1 WO 2018225766A1 JP 2018021658 W JP2018021658 W JP 2018021658W WO 2018225766 A1 WO2018225766 A1 WO 2018225766A1
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- inner ring
- outer ring
- rolling
- rolling bearing
- 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
- F16C33/30—Parts of ball or roller bearings
- F16C33/66—Special parts or details in view of lubrication
- F16C33/6696—Special parts or details in view of lubrication with solids as lubricant, e.g. dry coatings, powder
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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
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
- F16C32/0406—Magnetic bearings
- F16C32/044—Active magnetic bearings
- F16C32/0442—Active magnetic bearings with devices affected by abnormal, undesired or non-standard conditions such as shock-load, power outage, start-up or touchdown
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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
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
- F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
- F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
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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
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/54—Systems consisting of a plurality of bearings with rolling friction
- F16C19/541—Systems consisting of juxtaposed rolling bearings including at least one angular contact bearing
- F16C19/542—Systems consisting of juxtaposed rolling bearings including at least one angular contact bearing with two rolling bearings with angular contact
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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
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
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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
- F16C33/30—Parts of ball or roller bearings
- F16C33/58—Raceways; Race rings
- F16C33/583—Details of specific parts of races
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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
- F16C33/30—Parts of ball or roller bearings
- F16C33/58—Raceways; Race rings
- F16C33/64—Special methods of manufacture
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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
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
- F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
- F16C19/16—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with a single row of balls
- F16C19/163—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with a single row of balls with angular contact
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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
- F16C2202/00—Solid materials defined by their properties
- F16C2202/50—Lubricating properties
- F16C2202/54—Molybdenum disulfide
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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
- F16C2220/00—Shaping
- F16C2220/60—Shaping by removing material, e.g. machining
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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
- F16C2223/00—Surface treatments; Hardening; Coating
- F16C2223/02—Mechanical treatment, e.g. finishing
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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
- F16C2223/00—Surface treatments; Hardening; Coating
- F16C2223/02—Mechanical treatment, e.g. finishing
- F16C2223/06—Mechanical treatment, e.g. finishing polishing
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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
- F16C2223/00—Surface treatments; Hardening; Coating
- F16C2223/02—Mechanical treatment, e.g. finishing
- F16C2223/08—Mechanical treatment, e.g. finishing shot-peening, blasting
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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
- F16C2223/00—Surface treatments; Hardening; Coating
- F16C2223/30—Coating surfaces
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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
- F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
- F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
- F16C2240/54—Surface roughness
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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
- F16C2360/00—Engines or pumps
- F16C2360/44—Centrifugal pumps
- F16C2360/45—Turbo-molecular pumps
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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
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
- F16C32/0406—Magnetic bearings
- F16C32/044—Active magnetic bearings
- F16C32/0474—Active magnetic bearings for rotary movement
- F16C32/0493—Active magnetic bearings for rotary movement integrated in an electrodynamic machine, e.g. self-bearing motor
- F16C32/0497—Active magnetic bearings for rotary movement integrated in an electrodynamic machine, e.g. self-bearing motor generating torque and radial force
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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
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S384/00—Bearings
- Y10S384/90—Cooling or heating
- Y10S384/907—Bearing material or solid lubricant
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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
- Y10T29/49643—Rotary bearing
- Y10T29/49679—Anti-friction bearing or component thereof
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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
- Y10T29/49705—Coating or casting
Definitions
- An aspect of the present invention relates to a rolling bearing and a manufacturing method thereof.
- Rolling bearings are used in a variety of equipment, but as rolling bearings in which a coating layer made of a solid lubricant film is formed on race rings (inner and outer rings), for example, there is a touchdown bearing used in a turbo molecular pump (for example, see Patent Document 1).
- the touchdown bearing is provided together with the magnetic bearing, and while the rotating shaft normally rotates, the rotating shaft is supported by the magnetic bearing, and the touchdown bearing is not in contact with the rotating shaft.
- the magnetic bearing becomes uncontrollable, for example, the rotating shaft comes into contact with the raceway of the touchdown bearing (touched down) and is supported until the rotation stops to protect the magnetic bearing and the rotating shaft.
- the lubricity of the rolling bearing is ensured by forming a coating layer with a solid lubricating film on the surface of the raceway, particularly on the raceway surface on which the rolling elements make rolling contact. .
- an aspect of the present invention aims to provide a rolling bearing capable of enhancing the adhesion of the coating layer by new technical means and further having the basic performance of a rolling bearing, and a method for manufacturing the rolling bearing. To do.
- the inventor of the present invention makes the surface of the raceway (inner ring, outer ring) a super-finished surface by roughening the surface roughness to some extent (making it a micro-mirror surface), so that the coating layer made of a solid lubricant film is formed. It was found that the adhesion can be increased, and the embodiment of the present invention was completed based on this finding. That is, the rolling bearing according to one aspect of the present invention includes an inner ring, an outer ring, and a plurality of rolling elements interposed between the inner ring and the outer ring, and the inner ring and the outer ring are made of stainless steel. Each of the inner ring and the outer ring has a raceway surface on which the rolling elements are in rolling contact with each other, and is a superfinished surface, and a coating layer made of a solid lubricating film is formed on the superfinished surface.
- the adhesion of the coating layer on the raceway surface is high, and the life of the rolling bearing can be extended.
- the raceway surface is a superfinished surface even if its surface roughness is somewhat rough, it is possible to suppress problems such as the occurrence of vibration during rotation, and to achieve basic performance as a rolling bearing. Can have.
- the raceway surface is a blast surface (finished surface) and a coating layer of a solid lubricating film is formed on the blast surface.
- the rolling bearing an aspect of the present invention
- the reason why the adhesion of the coating layer is high is that the surface state of the superfinished surface (microscopic surface) is compatible with the solid lubricating film in the same manner as the blast surface or better than the blast surface. Presumed.
- a contact surface that is a surface other than the raceway surface and contacts with another member is a blast surface, and a coating layer made of a solid lubricant film is formed on the blast surface.
- a coating layer made of a solid lubricant film is formed on the blast surface.
- the coating layer may be formed of a molybdenum disulfide film or a tungsten disulfide film, and thereby, the lubricity of the rolling bearing can be ensured even under a vacuum where grease or oil cannot be used.
- the surface roughness Ra of the superfinished surface is preferably 0.1 or more and 0.8 or less.
- the raceway surface is a superfinished surface, but the surface roughness is relatively rough, so that the adhesion of the coating layer is increased.
- the finishing process for the raceway surface may be a rough superfinishing process.
- the superfinishing process for mirror finishing required for the raceway surface of a rolling bearing used in a machine tool or the like is not required, and the processing cost is reduced. Can do.
- the rolling bearing is a touch-down bearing used for a turbo molecular pump.
- Another aspect of the present invention is a method of manufacturing a rolling bearing including an inner ring, an outer ring, and a plurality of rolling elements interposed between the inner ring and the outer ring, and is an annular stainless steel
- An intermediate product that becomes the inner ring or the outer ring is obtained by turning from a raw material, a processing step for processing the intermediate product, and the inner ring and the outer ring manufactured after the processing step are combined with the rolling elements.
- the adhesion of the coating layer by the solid lubricating film is high, and the life can be extended.
- the rolling bearing as described above can be manufactured.
- FIG. 1 is a cross-sectional view illustrating an example of a turbo molecular pump including a rolling bearing according to an embodiment of the present invention.
- FIG. 2 is a sectional view of the rolling bearing.
- FIG. 3 is a flowchart showing a method for manufacturing a rolling bearing.
- FIG. 1 is a cross-sectional view showing an example of a turbo-molecular pump provided with a rolling bearing according to an embodiment of the present invention.
- the turbo molecular pump 10 includes a pump housing 11, a rotor blade 12 provided in the pump housing 11, a rotating shaft (rotor shaft) 13 that rotates integrally with the rotor blade 12, an axial magnetic bearing 14, First and second radial magnetic bearings 15, 16, a first rolling bearing 17, and a second rolling bearing 18 are provided.
- Each of the first and second radial magnetic bearings 15 and 16 can support the rotary shaft 13 from the radial direction in a non-contact state.
- a flange 19 is provided at the end (lower end in FIG. 1) of the rotary shaft 13, and the axial magnetic bearing 14 has a pair of electromagnets 14 a and 14 b, and these electromagnets 14 a and 14 b pivot on the flange 19. It is configured to be sandwiched from the direction. Thereby, the axial magnetic bearing 14 can support the rotating shaft 13 in the axial direction in a non-contact state with the flange 19 (the rotating shaft 13).
- the first rolling bearing 17 is provided on one side of the rotating shaft 13 in the axial direction (upper side in FIG. 1).
- the first rolling bearing 17 is a deep groove ball bearing including an inner ring 21, an outer ring 22, and a plurality of balls (rolling elements) 23, and can support the radial load of the rotating shaft 13.
- a gap in the radial direction is provided between the inner ring 21 and the rotary shaft 13, and this gap is smaller than the gap in the radial direction with respect to the rotary shaft 13 of the radial magnetic bearing 15 (16).
- the outer ring 22 is attached to a part of the pump housing 11.
- the second rolling bearing 18 is provided on the other axial side of the rotating shaft 13 (lower side in FIG. 1).
- the second rolling bearing 18 is a combination angular contact ball bearing including an inner ring 31, an outer ring 32, and a plurality of balls (rolling elements) 33, and can support the radial load and the axial load of the rotating shaft 13.
- a gap in the radial direction is provided between the inner ring 31 and the rotary shaft 13, and this gap is smaller than the gap in the radial direction with respect to the rotary shaft 13 of the radial magnetic bearing 15 (16).
- the outer ring 32 is attached to a part of the pump housing 11.
- the rotary shaft 13 is rotatably supported by the axial magnetic bearing 14 and the radial magnetic bearings 15 and 16.
- the rotating shaft 13 contacts (touches down) the inner rings 21, 31 of the first and second rolling bearings 17, 18, and the rotating rotating shaft 13 rotates. And supported by second rolling bearings 17 and 18.
- the first and second rolling bearings 17 and 18 function as touchdown bearings for the turbo molecular pump 10.
- FIG. 2 is a sectional view of the second rolling bearing 18.
- the second rolling bearing 18 is a combined angular ball bearing, and is configured by combining two angular ball bearings 29 and 30.
- One angular ball bearing 30 and the other angular ball bearing 29 are the same.
- one angular ball bearing 30 hereinafter simply referred to as the bearing 30
- the first rolling bearing 17 has a contact angle of the ball 23 with respect to the inner ring 21 and the outer ring 22, and accordingly the raceway surfaces of the bearing rings (the inner ring 21 and the outer ring 22) have a deep groove shape.
- it is different from the bearing 30 in a certain point it has the same configuration other than that, and is manufactured by the same manufacturing method as the bearing 30. For this reason, description of the details of the first rolling bearing 17 is omitted.
- the bearing 30 includes an inner ring 31, an outer ring 32, and a plurality of balls 33 (rolling elements) interposed between the inner ring 31 and the outer ring 32 as described above.
- An inner ring raceway surface 34 is formed on the outer peripheral surface of the inner ring 31, and an outer ring raceway surface 35 is formed on the inner peripheral surface of the outer ring 32.
- the inner ring 31 and the outer ring 32 are made of stainless steel (for example, SUS440C).
- the balls 33 may be made of stainless steel or silicon nitride.
- the inner ring raceway surface 34 is a superfinished surface, and a coating layer 36 made of a solid lubricating film is formed on the superfinished surface.
- the outer ring raceway surface 35 is a superfinished surface, and a coating layer 37 made of a solid lubricant film is formed on the superfinished surface.
- the coating layers 36 and 37 of this embodiment are the same, and are constituted by a molybdenum disulfide film. A tungsten disulfide film may be used instead of the molybdenum disulfide film.
- the inner ring raceway surface 34 is a superfinished surface, but the surface roughness is roughened to some extent, and the inner ring raceway surface 34 is a micromirror surface (micromirror surface finish surface).
- the outer ring raceway surface 35 is a superfinished surface, the surface roughness is roughened to some extent, and the outer ring raceway surface 35 is a fine mirror surface (micromirror surface finish surface).
- the surface roughness (centerline average roughness) Ra of the superfinished surface of each of the inner ring raceway surface 34 and the outer ring raceway surface 35 is preferably 0.1 or more and 0.8 or less. More preferably, the upper limit of the surface roughness Ra is 0.6 and the lower limit is 0.2. If the surface roughness Ra is less than the lower limit, the degree of adhesion of the coating layers 36 and 37 by the solid lubricant film may be slightly reduced. Further, if the surface roughness Ra exceeds the above upper limit value, the vibration when the ball 33 is in rolling contact may be slightly increased.
- a contact surface other than the inner ring raceway surface 34 and in contact with other members is a blast surface, and a coating layer 36 made of a solid lubricating film on the blast surface (same as the case of the inner ring raceway surface 34). Is formed.
- the bearing 30 functions as a touch-down bearing, the inner peripheral surface 38 and the axial side surface 39 of the inner ring 31 may come into contact (sliding contact) with the rotating shaft 13 (see FIG. 1).
- 38 and the side surface 39 are the aforementioned “contact surfaces that come into contact with other members”, and the inner peripheral surface 38 and the side surface 39 are subjected to blasting (shot blasting) and coated with a solid lubricant.
- the surface other than the inner ring raceway surface 34 and other than the contact surfaces is also a blast surface, and is on the blast surface.
- a coating layer 36 is formed by a solid lubricating film. That is, the coating layer 36 is formed on the entire surface of the inner ring 31.
- the pretreatment for coating the solid lubricant film differs between the inner ring raceway surface 34 and other surfaces.
- the inner ring raceway surface 34 is superfinished, whereas the other surfaces are blasted. is there.
- surfaces other than the outer ring raceway surface 35 are blast surfaces, and a coating layer 37 made of a solid lubricant film is formed on this blast surface (same as the case of the outer ring raceway surface 35). That is, the coating layer 37 is formed on the entire surface of the outer ring 32.
- the pretreatment for coating the solid lubricant film differs between the outer ring raceway surface 35 and other surfaces.
- the outer ring raceway surface 35 is superfinished, while the other surfaces are blasted. is there.
- FIG. 3 is a flowchart showing the manufacturing method.
- This manufacturing method includes a processing step S1 and an assembly step S2.
- the processing step S1 intermediate products that become the inner ring 31 or the outer ring 32 are obtained by turning from an annular stainless steel material, and each intermediate product is processed.
- the assembly step S ⁇ b> 2 the inner ring 31 and the outer ring 32 manufactured after finishing the processing step S ⁇ b> 1 are assembled together with the balls 33.
- the machining step S1 includes a polishing step S11, a superfinishing step S12, and a coating step S14 in addition to the step S10 for producing the intermediate product by turning. Further, the processing step S1 of the present embodiment includes a blasting step S13.
- the outer peripheral surface, the inner peripheral surface, and both axial end surfaces of the annular stainless steel material are turned into predetermined shapes, and the inner ring raceway surface 34 is formed. (Refer to FIG. 2) Or a groove shape is formed by turning in a region to be the outer ring raceway surface 35.
- the polishing step S11 the surface of the intermediate product is polished. In the present embodiment, polishing is performed on the entire surface of the intermediate product.
- the intermediate product (inner ring intermediate product) that becomes the inner ring 31 after the polishing process is subjected to superfinishing on the surface that becomes the inner ring raceway surface 34, and the intermediate product that becomes the outer ring 32 In the product (outer ring intermediate product), super finishing is performed on the surface to be the outer ring raceway surface 35.
- the superfinishing process performed on each of the inner ring raceway surface 34 and the outer ring raceway surface 35 is not a mirror finish, but a fine mirror finish process, and the surface roughness of the finish surface is processed to a certain degree.
- the surface roughness Ra of the superfinished surfaces is 0.1 or more and 0.8 or less.
- Surfaces other than the surface that becomes the inner ring raceway surface 34 in the inner ring intermediate product and surfaces other than the surface that becomes the outer ring raceway surface 35 in the outer ring intermediate product are not superfinished, and the surface polished by the polishing process (polishing step S11). It remains.
- the blasting process is performed on all surfaces except the inner ring raceway surface 34 in the surface of the inner ring intermediate product after the polishing process, and the polishing process is performed.
- Blasting is performed on all surfaces of the finished outer ring intermediate product except for the outer ring raceway surface 35.
- the surface roughness Ra of the blasted surface is, for example, 0.1 or more and 1.0 or less.
- a coating layer made of a solid lubricating film is formed on the superfinished surface (which becomes the inner ring raceway surface 34 or the outer ring raceway surface 35). Further, in the coating step S14 of the present embodiment, a coating layer made of a solid lubricating film is also formed on the surface subjected to the blasting process in the blasting step 13. That is, in the inner ring intermediate product, the coating on the other surface (blast surface) is performed in accordance with the coating on the inner ring raceway surface 34. Then, in the outer ring intermediate product, coating is performed on the other surface (blast surface) in accordance with the coating on the outer ring raceway surface 35. In this embodiment, coating with molybdenum disulfide is performed, and the specific direction is according to a conventionally performed method.
- an assembly step S2 is performed.
- balls 33 are interposed between the inner ring 31 and the outer ring 32 by a conventional method.
- the bearing 30 is completed.
- the inner ring 31 and the outer ring 32 are made of stainless steel, and the inner ring raceway surface 34 and the outer ring raceway surface 35 with which the balls 33 are in rolling contact are superfinished surfaces. And it becomes a rolling bearing by which the coating layers 36 and 37 by the solid lubricating film were formed on this superfinished surface.
- the surface roughness is increased to a certain extent (a micro mirror surface), whereby a coating layer 36 made of a solid lubricant film,
- the adhesion force of 37 is increased. That is, the superfinished surface of the present embodiment does not need to be a mirror-finished surface, and may be a fine mirror surface, which increases the adhesion between the coating layers 36 and 37.
- the repetition performance (life) of the turbo molecular pump 10 as a touch-down bearing can be extended, and the overhaul cycle of the turbo molecular pump 10 can be lengthened.
- the inner ring raceway surface 34 and the outer ring raceway surface 35 are superfinished surfaces (micromirror surfaces) even if the surface roughness is somewhat rough. It is possible to suppress such problems as, for example, and to have basic performance as a rolling bearing.
- the reason why the adhesion of the coating layers 36 and 37 is increased is that the surface states of the inner ring raceway surface 34 and the outer ring raceway surface 35 that are superfinished surfaces (micromirror surfaces) are the same as the blast surface. This is presumably because the compatibility with the solid lubricating film is better than that of the blast surface.
- blasting is performed on the surfaces of the inner ring intermediate product and the outer ring intermediate product, which have been polished, except for the raceway surfaces (34, 35).
- a coating layer (36, 37) made of a solid lubricating film is formed on the surface. For this reason, it is possible to enhance the adhesion of the coating layers (36, 37) on surfaces other than the raceway surfaces (34, 35).
- the finishing process for each of the inner ring raceway surface 34 and the outer ring raceway surface 35 may be a rough superfinishing process.
- the superfinishing process for the mirror surface finishing required for the raceway surface of a rolling bearing used in a machine tool or the like is unnecessary.
- the processing cost can be reduced.
- a polishing material such as a grindstone having a coarser grain than that in the case of mirror finish may be used.
- the bearing 30 of the present embodiment is suitable as a touch-down bearing for the turbo molecular pump 10.
- the rolling bearing of the present invention is not limited to the illustrated form, but may be of another form within the scope of the present invention.
- the bearing 30 of the embodiment is a touch-down bearing used for the turbo molecular pump 10 (see FIG. 1), but can be used for other purposes.
- a rolling element was a ball
- a rolling element may be a roller
- a rolling bearing may be a roller bearing.
- turbo molecular pump 31 inner ring 32: outer ring 33: ball (rolling element) 34: inner ring raceway surface 35: outer ring raceway surface 36: coating layer 37: coating layer 38: inner circumferential surface 39: side surface
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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- Rolling Contact Bearings (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
Abstract
Description
そこで、本発明の態様は、新たな技術的手段によってコーティング層の密着力を高め、更に、転がり軸受の基本的な性能を有することができる転がり軸受、及びその製造方法を提供することを目的とする。
すなわち、本発明の一つの態様の転がり軸受は、内輪と、外輪と、前記内輪と前記外輪との間に介在する複数の転動体と、を備え、前記内輪及び前記外輪はステンレス鋼製であり、前記内輪及び前記外輪それぞれが有し前記転動体が転がり接触する軌道面は、超仕上げ加工面であって、当該超仕上げ加工面上に固体潤滑皮膜によるコーティング層が形成されている。
本発明のほかの態様の製造方法によれば、前記のような転がり軸受を製造することができる。
研磨工程S11では、この中間品の表面に対して研磨加工を行う。本実施形態では、中間品の全面に対して研磨加工が行われる。
33:玉(転動体) 34:内輪軌道面 35:外輪軌道面
36:コーティング層 37:コーティング層 38:内周面
39:側面
Claims (6)
- 内輪と、外輪と、前記内輪と前記外輪との間に介在する複数の転動体と、
を備え、
前記内輪及び前記外輪はステンレス鋼製であり、
前記内輪及び前記外輪それぞれが有し前記転動体が転がり接触する軌道面は、超仕上げ加工面であって、当該超仕上げ加工面上に固体潤滑皮膜によるコーティング層が形成されている、転がり軸受。 - 前記内輪及び前記外輪において、前記軌道面以外の面であって他部材と接触する接触面はブラスト面であって、当該ブラスト面上に固体潤滑皮膜によるコーティング層が形成されている、請求項1に記載の転がり軸受。
- 前記コーティング層は、二硫化モリブデン皮膜又は二硫化タングステン皮膜により構成されている、請求項1又は2に記載の転がり軸受。
- 前記超仕上げ加工面の表面粗さRaは0.1以上であって0.8以下である、請求項1~3のいずれか一項に記載の転がり軸受。
- 前記転がり軸受は、ターボ分子ポンプに用いられるタッチダウン軸受である、請求項1~4のいずれか一項に記載の転がり軸受。
- 内輪と、外輪と、前記内輪と前記外輪との間に介在する複数の転動体と、を備えている転がり軸受の製造方法であって、
環状であるステンレス製素材から旋削により前記内輪又は前記外輪となる中間品を得ると共に、当該中間品に対して加工を行う加工工程と、
前記加工工程を終えて製造された前記内輪及び前記外輪を前記転動体と共に組み立てる組み立て工程と、を備え、
前記加工工程には、
前記中間品の表面に対して研磨加工を行う工程と、
研磨加工を終えた前記中間品が有し前記転動体が転がり接触する軌道面となる面に対して超仕上げ加工を行う工程と、
超仕上げ加工された前記面に固体潤滑皮膜によるコーティング層を形成する工程と、
が含まれる、転がり軸受の製造方法。
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US16/618,986 US11143233B2 (en) | 2017-06-09 | 2018-06-06 | Rolling bearing and method for manufacturing rolling bearing |
KR1020197035848A KR102557978B1 (ko) | 2017-06-09 | 2018-06-06 | 터치다운 베어링 및 터치다운 베어링 제조 방법 |
EP18813905.9A EP3636943B1 (en) | 2017-06-09 | 2018-06-06 | Rolling bearing and method for manufacturing such a rolling bearing |
CN201880037654.8A CN110709614A (zh) | 2017-06-09 | 2018-06-06 | 滚动轴承和用于制造滚动轴承的方法 |
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JP2017114051A JP6933007B2 (ja) | 2017-06-09 | 2017-06-09 | タッチダウン軸受及びタッチダウン軸受の製造方法 |
JP2017-114051 | 2017-06-09 |
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Cited By (1)
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US11668342B2 (en) | 2019-02-01 | 2023-06-06 | Roller Bearing Company Of America, Inc. | Integrated stud ball bearing with precision matched raceway contact angles for consistent stiffness of gimbal assembly |
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US11143233B2 (en) | 2021-10-12 |
CN110709614A (zh) | 2020-01-17 |
TWI772435B (zh) | 2022-08-01 |
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KR102557978B1 (ko) | 2023-07-21 |
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TW201903299A (zh) | 2019-01-16 |
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