CN108138849A - Rolling bearing - Google Patents

Rolling bearing Download PDF

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Publication number
CN108138849A
CN108138849A CN201680047905.1A CN201680047905A CN108138849A CN 108138849 A CN108138849 A CN 108138849A CN 201680047905 A CN201680047905 A CN 201680047905A CN 108138849 A CN108138849 A CN 108138849A
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CN
China
Prior art keywords
rolling
mentioned
rolling bearing
bearing
phosphate coating
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
Application number
CN201680047905.1A
Other languages
Chinese (zh)
Inventor
户田耕平
伊藤秀司
森内光洋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NTN Corp
Original Assignee
NTN Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NTN Corp filed Critical NTN Corp
Publication of CN108138849A publication Critical patent/CN108138849A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • 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
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/24—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for radial load mainly
    • F16C19/26—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for radial load mainly with a single row of rollers
    • 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
    • F16C33/34—Rollers; Needles
    • 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
    • F16C33/62—Selection of substances
    • 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

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

The present invention provides the rolling bearing in the rolling contact section surface of bearing components formation phosphate coating, the reduction for having antirust function while inhibiting bearing life.Rolling bearing (1) has phosphate coating (6) in the rolling element surface entirety of the inner peripheral surface entirety comprising inner ring raceway face (2a), all, comprising rolling element (4) the rolling surfaces (4a) of the outer peripheral surface comprising outer ring raceway face (3a), the film thickness of phosphate coating (6) is 6 μm or more, from surface to watch the envelope surface in the case of, the total projection area of the envelope more than 30% by projected area be 25 μm2Above crystal grain is formed.

Description

Rolling bearing
Technical field
The present invention relates to rolling bearings, the more particularly to rolling bearing used in general industry equipment.
Background technology
Equipment element as the sliding equipment as equipment, it is known that rolling bearing.For rolling bearing, due to inside The multiple rolling elements being configured between circle and outer ring are continuously rolled, therefore in the member of formation as rolling bearing Circle, outer ring, rolling element and retainer are applied continuously in contact stress.It is in addition, sudden and violent in industry equipment used in outdoor etc. In the case of being exposed to wind and rain, in the case where using cooling water etc. when implementing product processing using the equipment, it is possible to moisture Invade bearing.Therefore, inhibit the rolling contact fatigue caused by long time running and the getting rusty in the work(for preventing equipment of moisture of resulting from It can be important in deterioration.
In view of this, motion so far, which has, makes resistance to rolling contact fatigue and the improved rolling bearing of rust-preventing characteristic.For example, In patent document 1, report has and makes to result from corrosive wear in rolling bearing used in the heavy plate rolling equipment of steel The damage of sur-face peeling etc. is difficult to happen.For the rolling bearing of patent document 1, inner ring is made by nicarbing processing And outer ring and rolling element, multiple rolling elements are held in retainer between the roller surface of Internal and external cycle, Internal and external cycle roller surface and The rolling surface of rolling element forms phosphoric acid manganese salt envelope, thus successfully improves the longevity for rolling contact fatigue under corrosive environment Life.
Existing technical literature
Patent document
Patent document 1：Japanese Unexamined Patent Publication 2005-299838 bulletins
Invention content
The subject that the invention solves
For the bearing used for being exposed to air, for the purpose of antirust, it is carried out phosphate so far Film process.For example, since the full dress roller type bearings used in pulley are exposed to wind and rain, it is therefore desirable to antirust, it is another Aspect, due to being used for a long time with low speed rotation, it is therefore desirable to the long-life.Usually, if implementing phosphate coating processing, with Untreated condition ratio finds that bearing life (rolling fatigue life) reduces.Think the reason for this is that：If implement at phosphate coating Reason, then the surface roughness of bearing is deteriorated, therefore dies down for rolling, if operated under high loads, phosphate stripping From.On the other hand, phosphate coating has improves the effect of the lubricity of bearing by the way that oil is held in envelope surface, therefore According to film thickness, the state on surface, bearing life can change.
It is as noted above such in patent document 1, successfully improve the service life for rolling contact fatigue under corrosive environment. But form the crystal size of envelope and the relationship of film thickness and bearing life is still not clear.In addition, for patent document 1, make For base material, using carburizing steel as object, said effect and indefinite whether is also obtained with bearing steel etc..
The present invention is completed to cope with this problem, and it is an object of the present invention to provide on the rolling contact section surface of bearing components The rolling bearing for forming phosphate coating, there is antirust function while bearing life is inhibited to reduce.
Means for solving the problems
The rolling bearing of the present invention is the axis of rolling of at least part with phosphate coating on rolling contact section surface It holds, which is characterized in that the film thickness of above-mentioned phosphate coating is 6 μm or more, in the feelings from surface to the surface for watching the envelope Under condition, the total projection area of the envelope more than 30% by projected area be 25 μm2Above crystal grain is formed.Particularly, it is special Sign is, in the case of from surface to the surface for watching above-mentioned envelope, the total projection area of the envelope more than 40% by Projected area is 25 μm2Above crystal grain is formed.
It is characterized in that, above-mentioned rolling bearing has：In periphery the inner ring with inner ring raceway face, in inner circumferential with outer ring The outer ring of roller surface and the multiple rolling elements rolled between above-mentioned inner ring raceway face and above-mentioned outer ring raceway face, above-mentioned rolling Contact site surface be selected from above-mentioned inner ring raceway face, above-mentioned outer ring raceway face, above-mentioned rolling element rolling surface at least one.
It is characterized in that, above-mentioned rolling bearing is barrel roller bearing or taper roll bearing.In addition, which is characterized in that The rolling bearing for completely dress roller bearing (Gross こ ろ Shaft by).
It is characterized in that, above-mentioned rolling contact section surface is the surface of component being made of bearing steel.In addition, its feature exists In above-mentioned phosphate coating is phosphoric acid manganese salt envelope.In addition, which is characterized in that the film thickness of above-mentioned phosphate coating is 6~7.5 μ m。
The effect of invention
For the rolling bearing of the present invention, since at least part on rolling contact section surface is with 6 μm or more Film thickness, the phosphate coating for optimizing crystal size, therefore with antirust function, and resistance to rolling contact fatigue is excellent, can press down The reduction of bearing life processed.
Description of the drawings
Fig. 1 is the sectional view for an example for representing the rolling bearing of the present invention.
Fig. 2 is the sectional view of another for representing the rolling bearing of the present invention.
Fig. 3 is the sectional view of another for representing the rolling bearing of the present invention.
Fig. 4 is the figure for representing rolling fatigue testing result (influence of film thickness).
Fig. 5 is the figure for representing rolling fatigue testing result (influence of crystal size).
Fig. 6 is the figure for representing rolling fatigue testing result (influence of film thickness and crystal size).
Specific embodiment
In general, in order to improve antirust ability, the small compact texture of crystal grain is good, it is therefore contemplated that film thickness is made to be 1~4 μm or so It is advisable.The different multiple test films of film thickness are made in the present invention to implement rolling fatigue testing, have investigated film thickness and phosphate quilt The crystal size of film and the relationship in service life.Use test film and tool with the phosphate coating of 1~4 μm of film thickness as usual Have and investigate (aftermentioned implementation with being usually comparably the test film of the phosphate coating of 6~9 μm of the film thickness of thick film to compare Example).Finally, it is found that " film thickness of phosphate coating " and " crystal size for forming phosphate coating " generates bearing life It influences.The present invention is based on such experiences.
Rolling contact section surface of the rolling bearing of the present invention in the bearing components of inner ring, outer ring, rolling element etc. is extremely A few part has phosphate coating.The film thickness of phosphate coating is 6 μm or more, preferably 6~9 μm, more preferable 6~7.5 μm.
For phosphate coating, can by the way that the bearing components for becoming object are impregnated in phosphate treated liquid or Phosphate treated liquid is sprayed at the bearing components and is formed by person.In phosphate treated, preferred manganese phosphate salt treatment.As with In the treatment fluid of manganese phosphate salt treatment, for example, can enumerate phosphate radical by the manganese ion of divalent, iron ion, nickel ion and trivalent from The aqueous solution of manganese phosphate salt compound that son is formed.Using the treatment fluid, using steel as base material in the case of envelope shape Into reaction process it is for example following.By the 1st time of phosphoric acid manganese salt solution dissociation, free phosphoric acid is generated, by the free phosphoric acid, The dissolved ferric iron of metal surface.In the metal surface, hydrogen ion concentration is reduced, and the dissociation equilibrium of phosphoric acid manganese salt solution is to manganese phosphate The direction movement of salt generation, the crystallite of insoluble phosphoric acid manganese salt are precipitated in metal surface and form envelope.
For forming the crystallization particle diameter of envelope, film thickness, envelope roughness, can by using treatment fluid form Etc. suitably adjusting.In phosphate treated, the surface state of each bearing components is to crystallization particle diameter of envelope for being formed etc. Big influence is generated, therefore preferably carries out degreasing, the cleaning using ion exchange water of component surface before treatment.
In the rolling bearing of the present invention, for the phosphate coating formed on rolling contact section surface, in addition to above-mentioned Other than film thickness, there is feature in terms of crystal size is made to become particular range.Specifically, it is formd from surface to viewing In the case of the surface of phosphate coating, the 30% of the total projection area of the envelope is defined above to be 25 μm by projected area2 The range that above crystal grain is formed.That is, the phosphate coating to meet following formula.
100 × (in phosphate coating by projected area be 25 μm2The area that above crystal grain is formed)/(phosphate quilt The total projection area of film)=30%
25 μm of projected area2Above crystal grain is bigger crystal size, increased in its ratio, generally Ground, it is predicted that rolling fatigue life deteriorates, but in the present invention, shown in embodiment as be described hereinafter like that, obtains excellent As a result.It is thought that because：Thicker to a certain extent by phosphate coating surface, the oily retentivity of the envelope becomes larger, oil Generated lubricating action becomes best.If it is considered that aftermentioned embodiment result etc., within the above range, further preferably More than the 40% total projection area of above-mentioned envelope is 25 μm by projected area2The situation that above crystal grain is formed.
For the relationship shown in the above-mentioned formula in phosphate coating, for example, being formed at object position substantially uniform Phosphate coating carries out image with a part for light microscope, SEM (scanning electron microscope) shooting phosphate coatings Parsing, thus, it is possible to be confirmed.Crystal form (plate, granular, needle-shaped, column etc.) is not particularly limited, even appointing The shape of meaning also can confirm projected area by above-mentioned image analysis.For the upper limit of the projected area of crystal grain, as long as The size usually formed, then be not particularly limited, and is 25~50 μm as concrete example2Left and right.In addition, to above range The upper limit of (more than 30%) is also not particularly limited, and is 30~60% or so as concrete example.
In addition, there is correlation to a certain degree with film thickness in the size of crystal grain.Specifically, film thickness is thicker, envelope surface The size of crystal grain more becomes larger.It is thought that because：In order to make film thickness thickening, extend the film process time, thus crystallized Growth.For example, if film thickness be 3 μm hereinafter, if can hardly confirm that projected area is 25 μm2Above crystal grain is (in above-mentioned model It is less than 5% in enclosing).
Based on Fig. 1~Fig. 3, embodiments of the present invention will be described.Fig. 1~Fig. 3 is rolling bearing (cylinder roller Bearing) sectional view.As illustrated in figure 1, for rolling bearing 1, as bearing components, have：Have in periphery interior It encloses the inner ring 2 of roller surface 2a, there is the outer ring 3 of outer ring raceway face 3a, in inner ring roller surface 2a and outer ring raceway face 3a in inner circumferential Between multiple rolling elements 4 for rolling and the retainer 5 for keeping multiple rolling elements 4.In this embodiment, inner ring raceway is being included The inner peripheral surface of face 2a is all, the rolling of all, comprising rolling element 4 the rolling surface 4a of outer peripheral surface comprising outer ring raceway face 3a Body surface face entirety forms phosphate coating 6 (black thick line).For the phosphate coating 6, as described above, being by film thickness and knot The envelope that brilliant size optimizes.
In fig. 2 in shown embodiment, in the inner peripheral surface entirety comprising inner ring raceway face 2a, outer ring raceway is included The outer peripheral surface entirety of face 3a forms phosphate coating 6 (black thick line).In this embodiment, it is not formed in rolling surface 4a The envelope.In figure 3 in shown embodiment, formd in the rolling element surface entirety of the rolling surface 4a comprising rolling element 4 Phosphate coating 6 (black thick line).In this embodiment, the envelope is not formed in inner ring roller surface 2a, outer ring raceway face 3a. It should be explained that the phosphate coating 6 in Fig. 2 and Fig. 3 is identical with the phosphate coating of Fig. 1.
For the rolling bearing of the present invention, the example of Fig. 1~Fig. 3 is not limited to, as long as in rolling contact section table Phosphate coating as defined at least part formation in face.So-called rolling contact section surface is inner ring raceway specifically Face, outer ring raceway face, rolling surface.
As rolling bearing, the material as inner ring, outer ring, the rolling element of base material of phosphate coating etc. for forming the present invention Matter, such as bearing steel (high-carbon-chromium bearing steel JIS G 4805), case-hardened steel (JIS G 4104 etc.), high speed can be enumerated Steel (AMS 6490), stainless steel (JIS G 4303), high-frequency quenching steel (JIS G 4051 etc.).In addition, in the rolling of the present invention In bearing, the lubricant of lubricating oil, lubricating grease etc. comes between inner ring 2 and outer ring 3 and the rolling contact section (rolling face) of rolling element 4 It is lubricated.It as lubricant, is not particularly limited, arbitrary lubricating oil, lubricating grease can be used.These lubricants are kept In the surface of phosphate coating, help to lubricate, bearing life can be extended.
The rolling bearing of the present invention is not limited to the barrel roller bearing shown in Fig. 1~Fig. 3, can be applied to arbitrary The bearing of form.Particularly, it is suitable for the barrel roller bearing operated under high loads, the situation of taper roll bearing.In addition, In these, it is suitable for the full dress roller bearing (SL bearings) of no retainer.
Embodiment
Film process is implemented to cylinder roller (bearing steel) and test film has been made.The phosphate coating of formation is manganese phosphate Salt envelope will be impregnated in manganese phosphate salt treatment liquid as the cylinder roller of above-mentioned object and be formed.Change various conditions and make The multiple test films different with crystal size into film thickness.
For the test film, under the line contact contacted between cylinder roller is made, to contact face pressure 4.16GPa, load speed It spends 20400cpm and steam turbine oil VG68 is subjected to forced circulation oil supply, evaluated by measuring the duration of load application occurred up to stripping Resistance to rolling contact fatigue (splitting time (minute)).The relationship of film thickness and splitting time is shown in Figure 4, crystal size (is thrown 25 μm of shadow area2Above crystal area proportion) with the relationship of splitting time Fig. 5 is shown in, by film thickness and crystal size (projected area 25 μm2Above crystal area proportion) with the relationship of splitting time it is shown in Fig. 6.
Wherein, the film thickness of phosphate coating is as calculated by the difference of the diameter value of test film before and after the processing.In addition, for knot Brilliant size, for the image obtained by observing the arbitrary range of phosphate coating as light microscope with 200 times of multiplying power, It observes in the envelope recognized in the rectangle frame of image, the surface as the observation platform from light microscope is to during viewing Crystal grain projected area be 25 μm2The area that above crystal grain is formed is (total to throw relative to the gross area of above-mentioned rectangle frame Shadow area) ratio, calculated by above-mentioned formula.
The influence respectively generated firstly, for film thickness and crystal size to splitting time is investigated.As shown in Figure 4 that Sample, thickening (6 μm or more) by film thickness, splitting time can extend.In addition, as shown in figure 5, pass through projected area 25 μm2Above crystal area proportion increases (more than 30%), and splitting time can extend.
Then, the influence generated for both film thickness and crystal size (combination) to splitting time is investigated.Such as Fig. 6 Shown in like that, in film thickness in the range of 6.5~7.5 μm, with the increase of film thickness, 25 μm of projected area2Above crystallization Ratio and splitting time tend to increase.In the range of film thickness is 7.5~9.0 μm, with the increase of film thickness, it is seen that perspective plane 25 μm of product2The tendency of above crystal area proportion and splitting time reduction on the contrary.It is in range of the film thickness up to 7.5 μm to speculate this It is interior, in size distribution there is monodispersity, while crystalline growth equably carries out, in the range of film thickness is more than 7.5 μm, push away The monodispersity of survey size distribution is destroyed and crystalline growth unevenly carries out.It is thus regarded that：In order to realize the longer bearing longevity Life, more preferable 6~7.5 μm of the film thickness of phosphate coating.
In addition, by Fig. 5 and Fig. 6, for 25 μm of projected area2Above crystal area proportion, preferably more than 40%.If it is The range then can further extend splitting time, can realize long bearing life.
Industrial availability
The rolling bearing of the present invention can be suitable as the carrying high load capacity of coaster (pulley), crane etc., also easily exposure The rolling bearing of general industry equipment that is used for a long time under the harsh environment of wind and rain etc. utilizes.
The explanation of reference numeral
1 rolling bearing
2 inner rings
2a inner ring raceways face
3 outer rings
3a outer ring raceways face
4 rolling elements
4a rolling surfaces
5 retainers
6 phosphate coatings

Claims (8)

1. a kind of rolling bearing, which is characterized in that it is at least part on rolling contact section surface with phosphate coating Rolling bearing,
The film thickness of above-mentioned phosphate coating is 6 μm or more, in the case of from surface to the surface for watching the envelope, the envelope Total projection area more than 30% by projected area be 25 μm2Above crystal grain is formed.
2. rolling bearing according to claim 1, which is characterized in that from surface to the surface for watching above-mentioned envelope In the case of, the total projection area of the envelope more than 40% by projected area be 25 μm2Above crystal grain is formed.
3. rolling bearing according to claim 1, which is characterized in that above-mentioned rolling bearing has：There is inner ring in periphery The inner ring of roller surface, inner circumferential have outer ring raceway face outer ring and above-mentioned inner ring raceway face and above-mentioned outer ring raceway face it Between multiple rolling elements for being rolled,
Above-mentioned rolling contact section surface be selected from above-mentioned inner ring raceway face, above-mentioned outer ring raceway face, above-mentioned rolling element rolling surface In at least one.
4. rolling bearing according to claim 1, which is characterized in that above-mentioned rolling bearing is barrel roller bearing or circular cone Roller bearing.
5. rolling bearing according to claim 4, which is characterized in that above-mentioned rolling bearing is completely fills roller bearing.
6. rolling bearing according to claim 1, which is characterized in that above-mentioned rolling contact section surface is formed by bearing steel Component surface.
7. rolling bearing according to claim 1, which is characterized in that above-mentioned phosphate coating is phosphoric acid manganese salt envelope.
8. rolling bearing according to claim 1, which is characterized in that the film thickness of above-mentioned phosphate coating is 6~7.5 μm.
CN201680047905.1A 2015-08-21 2016-08-04 Rolling bearing Pending CN108138849A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2015163344A JP2017040328A (en) 2015-08-21 2015-08-21 Rolling bearing
JP2015-163344 2015-08-21
PCT/JP2016/072931 WO2017033699A1 (en) 2015-08-21 2016-08-04 Rolling bearing

Publications (1)

Publication Number Publication Date
CN108138849A true CN108138849A (en) 2018-06-08

Family

ID=58100076

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201680047905.1A Pending CN108138849A (en) 2015-08-21 2016-08-04 Rolling bearing

Country Status (4)

Country Link
JP (1) JP2017040328A (en)
KR (1) KR20180042287A (en)
CN (1) CN108138849A (en)
WO (1) WO2017033699A1 (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002294465A (en) * 2001-03-28 2002-10-09 Ntn Corp Surface treated film, rolling bearing, and surface treatment method
JP2004332915A (en) * 2002-12-12 2004-11-25 Nissan Motor Co Ltd Roller bearing

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Publication number Publication date
WO2017033699A1 (en) 2017-03-02
KR20180042287A (en) 2018-04-25
JP2017040328A (en) 2017-02-23

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