JP2000087973A - Corrosion resistant rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a corrosion resistant rolling bearing which is capable of maintaining the excellent lubricity for a long time even the bearing is in water or various kinds of cleaning solutions or under an environment where their mist is present, and preventing a lubricant from being scattered outside from the bearing and polluting the external environment. SOLUTION: A rolling bearing 1 in which an outer ring 3, an inner ring 2 and a rolling element 4 consist of a corrosion resistant material, and the rolling element 4 is held by a holder 5, is provided with a seal 6 fixed to a circumferential groove 3b of the outer ring 3 (or the inner ring 2), its seal lip 7 is brought into slidable contact with an outer diameter surface of the inner ring 2 (or an inner diameter surface of the outer ring), and the holder 5 is formed of a molten-moldable resin which is excellent in corrosion resistance, or a resin composition in which at least one kind to be selected from a solid lubricant and/or a fibrous filler is added to the resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling bearing suitable for various washing apparatuses and food machines used in the production process of, for example, semiconductors, liquid crystal panels, hard disks, etc., and particularly to water or various cleaning solutions (acid, acid, etc.). The present invention relates to a corrosion-resistant rolling bearing that can be used even in an environment in which such a liquid is present or mist-like or scattered and splashes on the bearing.

[0002]

2. Description of the Related Art A conventional rolling bearing comprises an inner ring having an inner raceway on an outer peripheral surface, an outer race having an outer raceway on an inner peripheral surface, and a plurality of rolling bearings rotatably inserted between the inner raceway and the outer raceway. It comprises a plurality of rolling elements and a retainer rotatably provided between an inner raceway and an outer raceway for holding and guiding the plurality of rolling bodies.

[0003] In general, rolling bearings are lubricated by filling lubricating oil or grease inside the bearings. As such a bearing, for example, Japanese Utility Model Laid-Open No. 55-3
Japanese Patent Publication No. 4002 and Japanese Utility Model Application Laid-Open No. 57-56218 discloses that lubricating oil or grease is filled in a bearing internal space to lubricate, and that water or the like intrudes into the bearing by a contact type seal or a labyrinth seal. There is disclosed a technique for preventing such a situation.

Further, Japanese Patent Publication No. 8-26891 and Japanese Patent No. 2709119 disclose ethylene tetrafluoroethylene (ETF) in which a cage contains a short fiber of a fluororesin or a potassium titanate whisker having a diameter of 2 μm or less.
E) A self-lubricating material such as resin is used. On the other hand, the rolling elements are made of hard carbon balls and the races are bearings made of a corrosion-resistant material. The friction between the cage and the rolling elements causes the self-lubricating material of the cage to roll. There is disclosed a technique of lubricating with a thin lubricating film formed by transferring (adhering) to a contact surface between a moving body, an inner ring, and an outer ring.

[0005]

[Problems to be solved by the invention]
In the method disclosed in JP-A-34002, the wear of the seal lip of the contact seal proceeds with the operation of the bearing, and when water or the like enters the inside of the bearing, the lubricant such as lubricating oil or grease softens and deteriorates. Lubricity is significantly reduced. Then, since the cage in this case is made of a metal material having no self-lubricating property, direct contact between the metal materials occurs on the contact surface between the cage and the rolling element, and as a result, the life of the bearing is extended. There is a problem that the length may be extremely short.

Further, when water or the like enters the inside of the bearing and softens as described above, the leakage or scattering of the lubricant to the outside of the bearing significantly increases, thereby contaminating the external environment of the bearing device. was there.

In particular, in the field of semiconductor, liquid crystal panel, and hard disk manufacturing, if dust or impurities in the lubricant adheres to the wafer, glass substrate, or aluminum substrate, it causes defects such as defects or short circuits. Scattering to the outside of the bearing is very problematic, and therefore lubricant such as lubricating oil or grease cannot be used.

In Japanese Utility Model Laid-Open Publication No. 57-15621, a labyrinth seal is used. However, since water or the like enters from the clearance space of the labyrinth seal, lubricating oil or grease is softened and deteriorated. It has the same problems as in the case of Japanese Patent Application Laid-Open No. 55-34002.

On the other hand, in the case of Japanese Patent Publication No. Hei 8-26891 or Japanese Patent No. 2709119, there is no problem of polluting the external environment of the bearing device because no lubricating oil or grease is used. However, there are other problems as follows.

In Japanese Patent Publication No. 8-26891, an opening for allowing water to flow is provided at a location where a rolling element exists between races. In Japanese Patent No. 2709119, a non-contact type shield plate is provided. Is installed. Therefore, in any case, water, various cleaning liquids or fine dust, abrasive powder, abrasion powder, etc. pass through the opening or the non-contact type shield plate and the surface facing the same and enter the inside of the bearing. Resulting in.

In both cases, the rolling elements are hard carbon spheres,
The hardness of hard carbon spheres is 1.5 times or more that of the bearing ring, but the strength is low, so even if light load is acceptable, medium or heavy load, impact load, or fine If foreign particles, abrasive powder, abrasion powder, or the like intrudes, part or all of the hard carbon spheres are chipped or broken and bites the fragments, resulting in extremely short bearing life. There was a problem that sometimes.

Similarly, when water or various cleaning solutions enter the inside of the bearing, transfer of the cage material to the rolling elements or the like due to frictional contact between the cage and the rolling elements is suppressed by the infiltrating solution. . For this reason, there is a problem that the lubricating film made of the cage material is not sufficiently formed, and the torque and vibration of the bearing increase in a relatively short time to reach the end of the life.

Further, in the case of Japanese Patent Publication No. Hei 8-26891, since the cage is formed of a fluororesin, the strength of the cage is low, the wear resistance is poor, and the cage is abnormally worn and the outside of the bearing is deteriorated. In such a case, a large amount of particles may be scattered, or the torque of the bearing may be significantly increased, leading to a long life. Further, since the fluororesin cannot be melt-molded, it is necessary to machine a rod or a ring material into a desired retainer shape by machining, which is very expensive.

As described above, in the conventional rolling bearing device, it is difficult to lubricate for a long time in water or various cleaning solutions or in an environment where these mist are present. The agent scatters outside and pollutes the external environment.

The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object the purpose of the present invention for a long period of time even in the presence of water or various washing nights or an environment in which mist is present. It is an object of the present invention to provide a corrosion-resistant rolling bearing that can maintain good lubrication throughout the bearing and does not scatter lubricant from the bearing to the outside and contaminate the external environment.

[0016]

According to a first aspect of the present invention, an outer ring, an inner ring, and a rolling element are made of a corrosion-resistant material, and the rolling element is held by a retainer. In the rolling bearing device to be provided, a seal fixed to a peripheral groove of the outer ring or the inner ring is provided, and its seal lip slides in contact with the outer diameter surface of the inner ring or the inner diameter surface of the outer ring, and melts the retainer. It is characterized by comprising a moldable resin having excellent corrosion resistance or a resin composition to which at least one selected from a solid lubricant and / or a fibrous filler is added.

Here, in the corrosion-resistant rolling bearing according to the first aspect of the present invention, the seal lip of the seal member has an outer diameter surface of the contact inner ring or a maximum surface roughness (Rmax) of an inner diameter surface of the outer ring of 30 μm or less. Range, preferably 10
It can be in the range of less than μm, more preferably in the range of less than 5 μm.

Further, in the corrosion-resistant rolling bearing or the corrosion-resistant rolling bearing in which the maximum surface roughness is defined according to the first aspect of the present invention, the outer surface or the whole of the rolling element may be made of ceramics.

Further, in the rolling bearing device in which the outer ring, the inner ring, and the rolling element are made of a corrosion-resistant material, and the rolling element is held by a cage, a seal fixed to a circumferential groove of the outer ring or the inner ring is made of a non-contact material. A mold shield plate, wherein the cage is formed of a resin that is melt-moldable and has excellent corrosion resistance or a resin composition to which at least one selected from a solid lubricant and / or a fibrous filler is added; At least the outer surface or the whole of the rolling element among the inner ring and the rolling element may be made of ceramics.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view showing the configuration of an embodiment of the rolling bearing of the present invention. In the figure, reference numeral 1 denotes a rolling bearing, which includes an inner ring 2, an outer ring 3 and a plurality of rolling elements 4.
, A retainer 5 and a contact type seal 6. The inner race 2 has an inner raceway groove 2a on the outer peripheral surface, and the outer race 3 has an outer raceway groove 3a on the inner peripheral surface. The rolling element 4 is a sphere and is rollably inserted between the inner raceway groove 2a and the outer raceway groove 3a. The retainer 5 is a crown-shaped plastic retainer, fixed while holding a plurality of rolling elements 4, and rotatably inserted between the inner raceway groove 2a and the outer raceway groove 3a. The contact-type seal 6 is made of an elastic material such as rubber and contains a cored bar 6A, and has a seal outer diameter side end portion for sealing an annular opening between the outer diameter of the inner ring 2 and the inner diameter of the outer ring 3. Is fixed to the circumferential groove 3b on the inner diameter surface of the outer ring 3, and the seal lip portion 7 at the inner diameter side end thereof is in contact with the outer diameter surface of the inner ring 2.

The rolling bearing 1 does not use lubricating oil or grease as a lubricant. Therefore, it does not pollute the external environment of the bearing. The retainer 5 is made of, for example, a fluorine-containing resin or polyetheretherketone (PEE).
The main component is a resin excellent in corrosion resistance that can be melt-molded such as K). Therefore, not only the corrosion resistance and sliding characteristics of the cage 5 itself are good, but also the cage 5 and the rolling elements 4
The material of the cage 5 is transferred to the rolling elements 4, the inner ring 2 and the outer ring 3 by frictional contact with the rolling element 4, and a thin lubricating film is formed. Lubrication is performed by the lubricating film. Therefore, the bearing can operate stably for a long period of time without using lubricating oil or grease. In addition, injection molding, which is a typical melt molding method, is possible.
Excellent mass productivity.

Further, since the contact type seal 6 is used,
Various foreign substances such as water, various cleaning solutions, fine dust, abrasion powder and abrasive powder can be prevented from entering the inside of the bearing. Therefore, there is no problem that the life of the bearing is extremely shortened due to biting of fine dust, abrasive powder, abrasion powder and the like that have entered the bearing as in the related art. Moreover, since water and various cleaning solutions do not enter the inside of the bearing, the rolling bearing can operate for a longer period of time.

Incidentally, an appropriate amount of a solid lubricant such as, for example, ethylene tetrafluoride resin powder (PTFE) may be added to the resin constituting the retainer 5. In this case, the lubrication characteristics of the cage itself are further improved, and the frictional force generated on the contact surface between the cage 5 and the rolling elements 4 is reduced. In addition, the solid lubricant is transferred to the rolling elements 4, the inner raceway groove 2a, and the outer raceway groove 3a together with the base resin forming the cage 5 to lubricate the bearing. Not only the wear is reduced, but also the wear of the lubricating film formed on the rolling elements 4, the inner raceway groove 2a, and the outer raceway groove 3a is reduced.

Further, an appropriate amount of a fibrous filler having an aspect ratio of, for example, 3 to 200 can be added to the resin constituting the retainer 5. In this case, since the strength and wear resistance of the cage 5 are improved, deformation and wear during operation of the cage 5 can be suppressed, and as a result, the rolling bearing 1 is stable for a longer period of time. Can operate.

Further, the outer diameter surface of the inner ring 2 on which the seal lip 7 of the seal 6 fixed to the circumferential groove 3b of the outer ring 3 (or the inner ring 2 may be used). , The maximum surface roughness (Rmax) of the outer ring 3)
Is within a range of 30 μm or less, the wear of the seal lip 7 can be suppressed, and water, various cleaning solutions, fine dust, abrasion powder, abrasive powder, and the like enter the inside of the bearing for a longer period of time. Thus, the rolling bearing 1 can be operated more stably for a longer period of time.

Although FIG. 1 shows the case where the contact type seal 6 is mounted, in the rolling bearing of the present invention, a non-contact type shield plate may be used instead. it can. In such a case, it is inevitable that foreign substances such as water, various cleaning solutions, fine dust, abrasion powder, and abrasive powder enter the inside of the bearing, but at least one of the outer ring 3, the inner ring 2, and the rolling elements 4. If the outer surface of the rolling element 4 is made of ceramics or the entire rolling element 4 is made of ceramics, the ceramics have high hardness and sufficient strength even if those foreign substances enter the inside of the bearing. Therefore, scratches, abrasion, and breakage hardly occur. Further, the transfer of the cage material to the rolling elements and the like due to the frictional contact between the cage 5 and the rolling elements 4 is suppressed by the solution that has entered the inside of the bearing, and the lubricating film of the cage material is sufficiently formed. Even without this, the bearings can operate for a long period of time because ceramics are inherently difficult to adhere.

The contents of the rolling bearing of the present invention will be described below.
This will be described in more detail. For corrosion-resistant materials for inner / outer rings and rolling elements
About: The inner ring, outer ring and rolling element of the rolling bearing of the present invention
The material is not particularly limited as long as it is a corrosion-resistant material. For example,
Stainless steel-based metal (SUS440C, LNS125,
ES-1, SUS630, YHD50, etc.) and silicon nitride
(Si_ThreeN_Four), Silicon carbide (SiC), sialon
(Sialon), partially stabilized zirconia (ZrO) _Two)
And alumina (Al_TwoO_Three) Represented by ceramic materials
Fees can be exemplified. In addition, these materials alone
Or they can be used in combination. The above
Among stainless steel-based metals, LNS125 and ES-1
Is shown in Table 1.

[0028]

[Table 1]

Regarding the material of the elastic body of the seal lip: The material of the elastic body constituting the seal lip of the rolling bearing of the present invention is not particularly limited. For example, nitrile rubber (butadiene.acrylonitrile copolymer), fluorine rubber (vinylidene fluoride / hexafluoropropylene copolymer, vinylidene fluoride / hexafluoropropylene / tetrafluoroethylene copolymer, vinylidene fluoride / pentafluoropropylene copolymer) Polymer, vinylidene fluoride / pentafluoropropylene / tetrafluoroethylene copolymer, vinylidene fluoride
Chlorotrifluoroethylene copolymer, tetrafluoroethylene / propylene copolymer, tetrafluoroethylene / perfluorovinyl ether copolymer, fluorinated silicone-based fluororubber, fluorinated phosphazene-based fluororubber, fluorinated thermoplastic fluororubber), Silicone rubber (polysiloxane), chloroprene rubber (polychloroprene), ethylene propylene rubber (ethylene propylene copolymer), hypalone (chlorosulfonated polyethylene) and epichlorohydrin rubber (CO epichlorohydrin, ECO epichlorohydrin ethylene oxide copolymer) ) Can be exemplified.

Particularly, in an acid or alkali solution environment, fluororubber is excellent in corrosion resistance and can be suitably used. In the case of fluororubber, vinylidene fluoride-hexafluoropropylene copolymers may be used as Daikin Industries' Daiel, DuPont's Viton, 3M's Fluorel, Monteflou's Tech.
noflon is mentioned as an example.

As a vinylidene fluoride-chlorotrifluoroethylene copolymer, Kel-
F Elastomer is mentioned as an example. Also,
As a trafluoroethylene / propylene copolymer, Afras manufactured by Asahi Glass Co., Ltd. may be mentioned as an example. Examples of the tetrafluoroethylene / perfluorovinyl ether copolymer include Kalrez manufactured by DuPont and Daiel Perflo manufactured by Daikin Industries. Also,
DowCor as a fluorine-containing silicone fluororubber
Ning Silastic LS is mentioned as an example. In addition, EYPEL manufactured by Ethy Corporation is used as a fluorinated fusophazene-based fluororubber.
-F is mentioned as an example. In addition, as the fluorine-containing thermoplastic fluororubber, Daikin Thermoplastic manufactured by Daikin Industries, Ltd. may be mentioned as an example.

The material of the non-contact type shield plate made of a corrosion-resistant material in the rolling bearing of the present invention is not particularly limited, but stainless steel-based metallic materials (SUS304, SUS).
303, SUS316, etc.) can be preferably used.

Regarding the resin material of the cage: As the resin which can be melt-molded and has excellent corrosion resistance used in the present invention,
Although not particularly limited, a fluorine-containing resin, polyetheretherketone (PEEK), a copolymer of polyetheretherketone and polybenzizomidal (PEEK-P
BI), polyphenylene sulfide (PPS), thermoplastic polyimide (TPI), polyether nitrile (P
EN), thermoplastic aromatic polyamideimide, etc., and these may be used alone or in combination of two or more.

The fluorine-containing resin that can be melt-molded is not particularly limited, but it is not limited to tetrafluoroethylene / perfluoroalkylvinyl ether copolymer (PFA), tetrafluoroethylene / ethylene copolymer (ETFE), or tetrafluoroethylene / hexafluoro. Propylene copolymer (FEP), polychlorotrifluoroethylene (PCT)
FE), chlorotrifluoroethylene / ethylene copolymer (ECTFE), polyvinylidene fluoride (PV
DF) and the like, and these may be used alone or in combination of two or more. In the case of an acid or alkali solution, PFA, ETFE, PVDF and FEP are preferred because of their excellent self-lubricating properties and corrosion resistance.

Regarding the solid lubricant to be added to the resin of the cage: The solid lubricant to be mixed with the resin constituting the cage of the rolling bearing of the present invention is ethylene tetrafluoride resin powder (PTF).
E), graphite, hexagonal boron nitride (hBN), fluoromica,
Melamine cyanurate (MCA), amino acid compound having a layered crystal structure (N-lauro-L-lysine), graphite fluoride, pitch fluoride, molybdenum disulfide (Mo)
S ₂ ) and at least one selected from tungsten disulfide (VS ₂ ). Among them, PTFE,
When MCA, graphite, N-lauro-L-lysine, hBN, and fluoromica are used alone or in combination of two or more, more favorable lubrication characteristics can be obtained.

Regarding the fibrous filler to be added to the resin of the cage: The fibrous filler to be mixed with the resin constituting the cage of the rolling bearing of the present invention is not particularly limited, but aluminum borate whisker, titanic acid Potassium whisker, aramid fiber, aromatic polyimide fiber, liquid crystal polyester fiber, calcium carbonate whisker, graphite whisker, magnesium oxosulfate whisker, glass fiber, carbon fiber, metal fiber, silicon carbide fiber, alumina fiber, boron fiber, silicon carbide whisker, Examples thereof include silicon nitride whiskers, alumina whiskers, aluminum nitride whiskers, wollastonite, zinc oxide whiskers, magnesium oxide whiskers, and mullite whiskers.

It should be noted that, within a range not to impair the object of the present invention,
Other additives such as the following may be blended, for example, antioxidants, heat stabilizers, ultraviolet absorbers, light protectants, flame retardants, antistatic agents, flow improvers, non-tacky agents Agents, crystallization accelerators, nucleating agents, pigments, dyes and the like.

The method of mixing these various additives, such as a resin, a solid lubricant and a fibrous filler, which can be melt-molded and have excellent corrosion resistance, is not particularly limited. For example, it is possible to separately melt-knead each of them, or to preliminarily mix these materials with a mixer such as a Henschel mixer, a tumbler, a ribbon mixer, a ball mill, etc., and then supply them to the melt mixer. .

As the melt mixer, a known melt kneader such as a single-screw or twin-screw extruder, a kneading roll, a pressure kneader, a Banbury mixer, and a Brabender plastograph can be used. The temperature at which the melt-kneading is performed is not particularly limited, but may be appropriately selected within a temperature range at which the melting of the resin having excellent corrosion resistance that can be melt-molded sufficiently proceeds and does not decompose.

The method of manufacturing the cage incorporated in the rolling bearing of the present invention is not particularly limited.
Molding can be performed by an ordinary method such as compression molding and transfer molding. In particular, the injection molding method is preferable because it has excellent productivity and can provide an inexpensive cage.

Regarding the manufacturing method of the cage: The method of mixing various additives such as resin, solid lubricant, fibrous filler and the like which can be melt-molded and has excellent corrosion resistance is not particularly limited.
For example, it is possible to separately melt-knead each of them, or to preliminarily mix these materials with a mixer such as a Henschel mixer, a tumbler, a ribbon mixer, a ball mill, etc., and then supply them to the melt mixer. .

As the melt mixer, a known melt kneader such as a single-screw or twin-screw extruder, a kneading roll, a pressure kneader, a Banbury mixer, and a Brabender plastograph can be used. The temperature at which the melt-kneading is performed is not particularly limited, but may be appropriately selected within a temperature range at which the melting of the resin having excellent corrosion resistance that can be melt-molded sufficiently proceeds and does not decompose.

The method of manufacturing the cage incorporated in the rolling bearing of the present invention is not particularly limited.
Molding can be performed by an ordinary method such as compression molding and transfer molding. In particular, the injection molding method is preferable because it has excellent productivity and can provide an inexpensive cage. (Comparative Test) Next, a comparative test performed to confirm the effects of the present invention will be described.

In Examples 1 to 50, the inner ring, outer ring, rolling elements, cage and seal were changed as shown in Tables 2 and 3.
In addition, various rolling bearings 1 of Comparative Examples 1 to 5 were produced.
Here, the seal lip of the contact type seal was made of nitrile rubber, and the non-contact type shield plate was made of SUS304.

[0045]

[Table 2]

[0046]

[Table 3]

The raw materials of the cage used in Examples and Comparative Examples of the present invention are collectively shown as follows. PFA (manufactured by Daikin Industries: NEOFLON PFA AP)
-201) ETFE (manufactured by Daikin Industries, Ltd .: NEOFLON ETFE)
EP-520) PTFE (manufactured by Daikin Industries, Ltd .: Lubron L-5, average particle size: 0.2 μm) MCA (manufactured by Mitsubishi Chemical Corporation: melamine silanurate, average particle size: 2 μm) Potassium titanate whisker (manufactured by Otsuka Chemical: Tismo) D-101, diameter 0.3-0.6 μm, length 10-20
μm) Aluminum borate whisker (Shikoku Chemicals:
Albolex YS1, diameter 0.5-1.0 μm, length 1
Aramid fiber (Aramid fiber 97 manufactured by DuPont)
9, diameter 12 μm, length 0.8 mm) Carbon fiber (Kinol fiber KF02BT manufactured by Gun Ei Chemical Co., Ltd., diameter 14 μm, length 0.2 mm) The cage incorporated in the test bearing of each embodiment is as follows. Molded.

To prevent breakage of the fibrous filler, various materials other than the fibrous filler are dry-mixed with a Henschel mixer, and the fibrous filler is added by a quantitative side feeder and extruded using a twin-screw extruder. To pelletize the pellet. This was supplied to an injection molding machine and molded to obtain a desired cage shape (a cage for a model number equivalent to 6000). In addition,
The shape of the cage 5 was a crown type cage.

A rolling test was performed on the rolling bearings of the above Examples and Comparative Examples using a Nippon Seiko bearing rotating tester under the following conditions, and the life was evaluated based on the vibration value. Here, the time when the vibration value increased to three times the initial value was defined as the life of the rolling bearing. These test results are summarized in Tables 2 and 3. In addition, the life of the rolling bearing in each of the examples and the comparative examples is indicated by a relative value where the life of the comparative example 1 is 1.

The test conditions are as follows. ○ Test bearing: Model 6000 equivalent ball bearing (inner diameter 10mm,
(Outer diameter: 26 mm, width: 8 mm) ○ Atmosphere: In a spray environment of pure water ○ Atmospheric temperature: Normal temperature ○ Radial load: 980 N O Rotation speed: 1000 r. p. m In Examples 5, 9, 17, and 21, the relationship between the maximum surface roughness and the life of the rolling bearing when the maximum surface roughness of the outer diameter surface of the inner ring (the surface on which the seal lip contacts and slides) is changed. As shown in FIG. In FIG. 2, the horizontal axis represents the maximum surface roughness (Rmax) of the outer diameter surface (the surface on which the seal lip contacts and slides) of the inner ring, and the vertical axis represents the life of the rolling bearing. However, the service life of the rolling bearing is 1 compared to the service life of Comparative Example 1.
The relative values are shown as follows.

The curve 31 in FIG. 2 is for the seventeenth embodiment, in which the rolling elements, inner and outer rings are SUS440C, and the retainer is ET.
It shows the life when the composite material and seal of FE and aluminum borate whisker constitute a rolling bearing with a contact type seal.

Curve 32 is Example 9 where the rolling element is silicon nitride, the inner and outer rings are SUS440C, and the retainer is ETF.
The composite material of E and potassium titanate whisker and the seal show the service life when the rolling bearing is constituted by a contact type seal.

Curve 33 is Example 5, in which the rolling element, the inner and outer rings are ES-1, the cage is a composite material of ETFE and potassium titanate whisker, and the seal is a contact type seal. Is shown.

Curve 34 is Example 21 in which the rolling element is silicon nitride, the inner and outer rings are ES-1, the retainer is a composite material of ETFE and aluminum borate whisker, and the seal is a contact type seal and a rolling bearing. Shows the life in the case where is constituted.

As shown in Tables 2 and 3 and FIG. 2, the rolling bearing of the embodiment of the present invention has a much longer life than the comparative example even in an environment where water is mixed. I understand.

[0056]

As described above, in the rolling bearing according to the present invention, the resin which is excellent in corrosion resistance and which can be melt-molded, which constitutes the cage, is transferred from the cage to the rolling elements, the raceway grooves, etc., and solid lubrication is performed. In order to form a film, good lubricity can be maintained over a long period of time even in the environment where water or various cleaning nights or their mist are present, and no lubricant such as lubricating oil or grease is used. Therefore, there is an effect that a long-life, corrosion-resistant rolling bearing can be obtained which does not scatter from the bearing and contaminate the external environment.

[Brief description of the drawings]

FIG. 1 is a sectional view of one embodiment of a rolling bearing of the present invention.

FIG. 2 shows the relationship between the maximum surface roughness and the life of the rolling bearing when the maximum surface roughness of the outer diameter surface (the surface on which the seal lip contacts and slides) is changed in the embodiment of the present invention. FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rolling bearing 2 Inner ring 2a Inner ring raceway surface 3 Outer ring 3a Outer ring raceway surface 4 Rolling element 5 Cage 6 Seal 7 Seal lip

Continued on the front page F term (reference) 3J016 AA01 BA02 BB03 CA01 3J101 AA02 AA32 AA42 AA62 BA10 BA50 BA53 BA54 BA73 CA34 EA31 EA41 FA08 GA55

Claims (1)

[Claims] 1. A rolling bearing device in which an outer ring, an inner ring, and a rolling element are made of a corrosion-resistant material, and wherein the rolling element is held by a retainer, wherein a seal fixed to a circumferential groove of the outer ring or the inner ring is provided. At least one selected from the group consisting of a resin having excellent corrosion resistance capable of melting and forming the retainer and a solid lubricant and / or a fibrous filler, which is capable of sliding in contact with the outer diameter surface of the inner ring or the inner diameter surface of the outer ring. A corrosion resistant rolling bearing comprising a resin composition to which a type is added.