JP2002081448A - Rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling bearing capable of obtaining long service life without using any lubricating oil or grease for lubrication. SOLUTION: Balls (rolling elements) 3 satisfy all conditions of (1) to (3): (1) balls are formed of a synthetic resin mainly consisting of at least one of aromatic polyimide, thermoplastic polyimide, aromatic polyamide-imide, polyphenylene-sulfide, polyether-ether-ketone, polybenzimidazole, copolymer of polyether-ether-ketone and polybenzimidazole, polyether-imide, polyether- nitrile, and aromatic polyester, (2) the bending strength in accordance with 'ASTM-D790' is >=60 MPa, and (3) the thermal deformation temperature at the pressure of 1.82 MPa (18.6 kgf/cm2) in accordance with 'ASTM-D648' is >=150 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a high-temperature atmosphere for various cleaning apparatuses (wet cleaning apparatuses, dry cleaning apparatuses such as ultraviolet cleaning and ozone cleaning) used in the manufacturing process of semiconductor devices, liquid crystal panels, hard disks, and the like. Rolling bearings suitable for various transporting devices, food machines, etc.

[0002]

2. Description of the Related Art Rolling bearings are used in environments where a clean atmosphere is required, in liquids (water, acidic or alkaline cleaning liquids, etc.), and in environments in which liquid mist or droplets are present, as in the above applications. Has the following problems. First, when lubricating with lubricating oil or grease (hereinafter, referred to as "lubricating oil"), the lubricating oil or the like softens or deteriorates due to infiltration of liquid into the bearing, so that the lubricating action is significantly reduced, and the life is reduced. May be shortened. Second, the environment outside the bearing may be contaminated by leakage or scattering of softened or deteriorated lubricating oil or the like to the outside of the bearing.

In order to prevent this, a contact type seal or a labyrinth seal is provided, but the effect is not sufficient. In particular, in the manufacturing process of semiconductor devices, liquid crystal panels, hard disks, etc., wafers,
If the glass substrate or the aluminum substrate is contaminated with a lubricating oil or the like, it causes defects such as defects and short circuits, and therefore cannot be lubricated using a lubricating oil or the like. Therefore, a self-lubricating rolling bearing that does not require the use of lubricating oil or the like for lubrication has been conventionally proposed.

Some self-lubricating rolling bearings have an inner ring and / or an outer ring made of synthetic resin. Since the shaft and the housing are often made of metal, it is not preferable to make the inner ring and the outer ring made of synthetic resin.
That is, since the coefficient of linear expansion between synthetic resin and metal differs by about one digit, if the inner ring and the outer ring are made of synthetic resin, the temperature between the inner ring and the shaft and the distance between the outer ring and the housing increase as the temperature rises during use. Gaps are likely to be formed. As a result, there is a problem that the operation failure of the rolling bearing easily occurs and the life is shortened.

[0005] A rolling bearing provided with a rolling element made of a synthetic resin is described in, for example, Japanese Patent Publication No. 37-9104. In this rolling bearing, rolling elements made of steel and rolling elements made of synthetic resin are alternately arranged between the inner and outer rings. As the synthetic resin forming the rolling element, a polyamide resin, a fluororesin,
Phenol resins, polyoxymethylene resins, and polycarbonate resins are mentioned. The rolling element made of synthetic resin has a through hole for filling lubricating oil, and the lubricating oil in this hole lubricates the bearing. That is,
This rolling bearing is not a self-lubricating rolling bearing because lubrication is performed using lubricating oil.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a rolling bearing having a long service life without using lubricating oil or grease for lubrication.

[0007]

According to the present invention, at least one of a plurality of rolling elements includes an aromatic polyimide, a thermoplastic polyimide, an aromatic polyamideimide, a polyphenylene sulfide, and a polyphenylene sulfide. It consists of a synthetic resin containing at least one selected from ether ether ketone, polybenzimidazole, a copolymer of polyetheretherketone and polybenzimidazole, polyetherimide, polyethernitrile, and aromatic polyester, ASTM-
D790 "is 60 MPa or more,
The pressure according to "ASTM-D648" is 1.82 MPa (1
A rolling bearing having a heat deformation temperature at 8.6 kgf / cm ² ) of 150 ° C. or more.

In the rolling bearing of the present invention, since the rolling element is made of the above-mentioned synthetic resin, it has excellent self-lubricating properties and high wear resistance. At the time of frictional contact with the bearing ring and the cage, it is expected that the polymer as the main component of the rolling elements is transferred to the cage and the bearing ring, and a thin lubricating film is formed on the bearing ring and the cage. In addition, since the rolling element has a bending strength of 60 MPa or more according to “ASTM-D790”, the rolling element has a sufficient strength and is less likely to cause abrasion powder and interface slip. Further, the pressure of the rolling element according to "ASTM-D648" is 1.82MP.
a (18.6 kgf / cm ² ) with a heat deformation temperature of 150
Since the temperature is not less than ° C., the rolling element has excellent heat resistance, and is less likely to be worn, deformed, or bitten by the temperature rise during use of the bearing.

As a result, according to the rolling bearing of the present invention,
Even if lubricating oil or grease is not supplied into the bearing, lubrication can be maintained for a long period of time. That is, according to this rolling bearing, since it is not necessary to supply lubricating oil or grease into the bearing, the external environment is not polluted by the lubricant. In the rolling bearing of the present invention, it is preferable that a solid lubricant is added to a synthetic resin constituting the rolling element. As a result, at the time of frictional contact with the race and the cage,
Since the solid lubricant is transferred to the bearing ring and the cage together with the polymer as the main component of the rolling elements, a thin lubricating film is more easily formed on the bearing ring and the cage than when the solid lubricant is not added. As a result, the lubrication performance of the bearing ring and the cage can be improved without supplying lubricating oil or the like to the inside of the bearing. Also,
The self-lubricating properties and wear resistance of the rolling elements are higher.
Therefore, the bearing life when lubricating oil or grease is not supplied into the bearing can be further extended.

As a solid lubricant which can be added to the synthetic resin constituting the rolling element, polytetrafluoroethylene (PT
FE), graphite, hexagonal boron nitride (hBN), fluorine mica, melamine cyanurate (MCA), an amino acid compound having a layered crystal structure (N-lauro-L-lysine),
Examples include graphite fluoride, pitch fluoride, molybdenum disulfide, and tungsten disulfide. These can be used alone or in combination of two or more thereof.

The average particle size of the solid lubricant used is 0.1
It is preferably in the range of not less than μm and not more than 20 μm. In the case of particles having a small average particle diameter of less than 0.1 μm, aggregation of the particles may occur when mixed with the resin as the main component, and the dispersion of the particles may be non-uniform. On the other hand, in the case of particles having a large particle diameter exceeding 20 μm, the smoothness of the rolling element surface is reduced and the strength is reduced, so that the life of the bearing may be shortened.

The content of the solid lubricant is preferably not more than 30% by weight in the resin composition constituting the rolling element. Even if the solid lubricant is mixed in more than 30% by weight,
Not only cannot a further improvement of the lubricating action be expected, but also the mechanical strength of the rolling elements is reduced, wear and deformation of the rolling elements are increased, and the life of the bearing may be shortened. In addition, besides the solid lubricant, various additives may be added to the synthetic resin constituting the rolling element within a range that does not impair the object of the present invention. Examples of the additive include an antioxidant, a heat stabilizer, an ultraviolet absorber, a light protectant, a flame retardant, an antistatic agent, a fluidity improver, an amorphous tackifier, a crystallization accelerator, and a nucleating agent. Agents, pigments, dyes and the like.

[0013] In the rolling bearing of the present invention, at least one of the plurality of rolling elements may have the above configuration, and all the rolling elements may have the above configuration. When a part of the plurality of rolling elements has the above configuration, the other rolling elements are preferably made of steel or ceramics. In this case, it is preferable that the rolling elements having the above configuration and the rolling elements made of steel or ceramics are alternately arranged.

A rolling element made of steel or ceramics is more excellent in load resistance than a rolling element made of synthetic resin.
In addition, the frictional contact between the rolling element made of steel or ceramic and the rolling element made of synthetic resin causes transfer of the polymer and the solid lubricant, which are the main components, to form a thin lubricating film. . Therefore, some rolling elements are made of the above-mentioned synthetic resin, and the other rolling elements are made of steel or ceramics. , Longer life.

If the rolling elements made of synthetic resin and the rolling elements made of steel or ceramic are alternately arranged,
The load resistance of the steel or ceramic rolling elements can be obtained in a well-balanced manner. In addition, the aforementioned thin lubricating film
It is easy to be formed on all rolling elements made of steel or ceramics. Therefore, the life of the rolling bearing can be further extended.

The rolling bearing of the present invention may or may not be provided with a cage. When the cage is provided, the cage may be made of a heat-resistant resin or made of iron or steel. It is preferable to provide a coating made of a solid lubricant on the surface.
As a result, the self-lubrication characteristics and wear resistance of the cage are improved, so that the self-lubrication performance at the contact surface between the rolling element and the cage is increased, and the life of the bearing is further extended.

When the cage is made of a heat-resistant resin, it is preferable to manufacture the cage by injection molding using a thermoplastic resin which can be melt-molded as exemplified below. Examples of the melt-moldable thermoplastic resin for preparing the retainer include fluororesin, thermoplastic polyimide, polyphenylene sulfide, polyetheretherketone, polybenzimidazole, a copolymer of polyetheretherketone and polybenzimidazole, polyetherimide, And polyether nitriles. These can be used alone or in combination of two or more thereof.

Among them, the fluororesins include tetrafluoroethylene-perfluoroalkylvinyl ether copolymer (PFA), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), polychlorotrifluoroethylene (PCTFE), tetrafluoroethylene Examples include ethylene-ethylene copolymer (ETFE), chlorotrifluoroethylene-ethylene copolymer (ECTFE), and polyvinylidene fluoride (PVDF).
These can be used alone or in combination of two or more thereof.

When the cage is made of a heat-resistant resin, it is preferable that the solid lubricant described above is added to the heat-resistant resin constituting the cage. As a result, at the time of frictional contact with the retainer, the solid lubricant is transferred to the rolling elements and the raceway together with the main component polymer to form a thin lubricating film. Even so, the lubrication performance of the entire bearing is further improved. As a result, the bearing life when lubricating oil or grease is not supplied into the bearing can be further extended.

In the case of a cage, the average particle size of the solid lubricant is preferably in the range of 0.1 μm to 30 μm. In the case of small particles having an average particle diameter of less than 0.1 μm, aggregation between the particles occurs when the particles are mixed with the main component resin,
The dispersion of particles may be non-uniform. -Way, 30 μm
Large particles having a particle diameter exceeding the above range may decrease the smoothness of the cage surface and the strength, and thus may shorten the life of the bearing.

In the case of a cage, the solid lubricant content is
It is preferable that the content in the resin composition constituting the retainer is 40% by weight or less. Even if the solid lubricant is added in an amount exceeding 40% by weight, further improvement of the lubricating action cannot be expected, but also the mechanical strength of the cage is reduced, and the wear and deformation of the cage are increased, and the Life may be shortened.

When the cage is made of a heat-resistant resin, it is preferable to add a fibrous filler to the heat-resistant resin constituting the cage. Thereby, since the strength and wear resistance of the cage are improved, deformation and wear of the cage during operation of the bearing are suppressed, and the bearing can operate stably for a longer period of time. Examples of the fibrous filler include aluminum borate whiskers, potassium titanate whiskers, carbon whiskers, aramid fibers, aromatic polyimide fibers,
Liquid crystal polyester fiber, graphite whisker, glass fiber, carbon fiber, boron fiber, silicon carbide whisker,
Examples include silicon nitride whiskers, alumina whiskers, aluminum nitride whiskers, wollastonite, and the like.

The fibrous filler preferably has an aspect ratio of 3 to 200. With a fibrous filler having an aspect ratio of less than 3, the reinforcing effect of the molded article is not sufficiently exhibited, and if the aspect ratio exceeds 200, uniform dispersion during mixing becomes extremely difficult. The fiber diameter of the fibrous filler is not particularly limited, but preferably has an average fiber diameter of 0.2 μm or more and 30 μm or less, more preferably 0.3 μm or more and 5 μm or less.

It is preferable that the content of the fibrous filler in the resin composition constituting the retainer is 40% by weight or less. Even if the content exceeds 40% by weight, further improvement in mechanical strength cannot be expected, and also the fluidity during melt molding of the resin composition is significantly reduced. Further, from the viewpoint of fluidity during melt molding and mechanical strength of the molded body, the total content of the solid lubricant and the fibrous filler in the resin composition constituting the retainer is 50% by weight or less. Is preferred. Even when the content of each of the solid lubricant and the fibrous filler in the resin composition is 40% by weight or less, if the total content of both exceeds 50% by weight, the resin composition may be melt-molded. The fluidity and the mechanical strength of the molded article may be significantly reduced.

[0025] The resin composition constituting the retainer may include fibers.
When compounding fillers, adhere to the base resin
For the purpose of improving the properties and dispersing evenly in the base material,
Surface treatment with silane or titanate coupling agents
May be reasonable, or for any other purpose.
May be subjected to a surface treatment according to the above. The present invention
The material of the inner and outer rings is particularly limited
Although not specified, for example, bearing steel such as SUJ2, SUS44
OC, LNS125, ES1, SUS630
Stainless steel, M50 (Cr-Mo-V steel) or SKH
4 (high-speed steel) or the like can be used. Ma
Silicon nitride (Si_ThreeN_Four), Silicon carbide (SiC),
Sialon, partially stabilized zirconia (Z
rO _Two), And alumina (Al_TwoO_Three) And other ceramics
May be used. Titanium alloy, aluminum alloy,
A magnesium alloy may be used.

Note that LNS125 and ES1 are Nippon Seiko's unique standard numbers. LNS125 has a C content of 0.6% by weight to 0.7% by weight, a Si content of 1.00% by weight or less, a Mn content of 1.00% by weight or less, and a Cr content of 12% by weight. 0.01 to 13.5% by weight of martensitic stainless steel. ES1 has a C content of 0.44% to 0.46% by weight, a Si content of 0.2% to 0.4% by weight, and a Mn content of 0.1%.
2 wt% to 0.4 wt%, Cr content of 12.8 wt% to 13.2 wt%, N content of 0.09 wt%
0.18 wt% martensitic stainless steel.

In the rolling bearing of the present invention, it is preferable that the inner ring and the outer ring are made of metal or ceramics, and the surface (at least the raceway surface) is provided with a coating made of a solid lubricant. As a result, the wear resistance of the inner ring and the outer ring is increased, so that the life of the rolling bearing can be further extended. In particular, the wear of the inner ring and the outer ring can be reduced before the transfer of the lubricating film from the rolling elements and the cage made of synthetic resin to the surfaces of the inner ring and the outer ring occurs.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to specific examples. As a test rolling bearing, a single-row deep groove ball bearing (inner diameter 10 mm, outer diameter 26 mm, width 8 mm) corresponding to the nominal number 6001 was used.
It was assembled with the configuration shown in Table 1 below. FIGS. 1A to 1F are cross-sectional views of these rolling bearings.

As shown in FIG. 1 (a), Examples 1 and 5 and Comparative Example 2 of these rolling bearings have an outer ring 1, an inner ring 2, a ball (rolling element) 3, and a crown-shaped cage 4 as shown in FIG. It is composed of As shown in FIG. 1B, the rolling bearings of Example 2 and Comparative Example 2 include an outer ring 1, an inner ring 2, and a ball (rolling element).
3 and a waveform retainer 5. Example 3
As shown in FIG. 1 (e), the rolling bearing includes an outer ring 1, an inner ring 2, a ball (rolling element) 3, and a wave-shaped retainer 5. A coating 5 made of a solid lubricant (graphite) is provided on the contact surface of the metal (SUS304) cage 5 with the ball 3.
1 is formed. Examples 4, 6, 9 and Comparative Example 3
As shown in FIG. 1 (c), the rolling bearing is a full ball bearing composed of an outer ring 1, an inner ring 2, and a ball (rolling element) 3, and without using a retainer 4.

The rolling bearings of Examples 7 and 10 are shown in FIG.
As shown in (d), outer ring 1, inner ring 2, balls (rolling elements)
3 and a crown-shaped retainer 4. Also, on the inner peripheral surface of the outer ring 1 and the outer peripheral surface of the inner ring 2 made of metal (ES1),
A coating 11 made of a solid lubricant (graphite or PTFE),
21 are formed. The rolling bearing of Embodiment 8 is shown in FIG.
As shown in (f), this is a full ball bearing that is composed of an outer ring 1, an inner ring 2, and a ball (rolling element) 3, and does not use a retainer 4. A coating 1 made of a solid lubricant (graphite) is formed on the inner peripheral surface of the outer ring 1 and the outer peripheral surface of the inner ring 2 made of metal (ES1).
1, 21 are formed.

Here, the following materials were used as the rolling element 3, the crown-shaped cage 4, the resin as the material of the coatings 11, 21 and 51, and the additives. Aromatic polyimide (PI): "Vespel-" manufactured by DuPont
1) Aromatic polyamideimide (PAI): "Toron 5031" manufactured by Teijin Amoko Engineering Plastics Co., Ltd. Polyphenylene sulfide (PPS): "Ryton R-6" manufactured by Philippe Perlorium Co., Ltd. Polyetheretherketone (PEEK): manufactured by Victrex "Victrex PEEK 150G" Polybenzimidazole (PBI): "Cerazole U-60" manufactured by Hoechst Celanese Copolymer of polyetheretherketone and polybenzimidazole (PEEK-PBI): "Cerazole TU-60" manufactured by Hoechst Celanese Polyetherimide (PEI): "Ultem 1000" manufactured by GE Plastics Japan, Inc. Polyethernitrile (PEN): "ID300" manufactured by Idemitsu Materials Co., Ltd. Polycarbonate (PC): GE "Lexane" Polyacetal (POM): "Duracon M50" manufactured by Polyplastics Co., Ltd. Polyvinylidene fluoride (PVDF): "Kureha KF Polymer T- # 1000" manufactured by Kureha Chemical Industry Polytetrafluoroethylene (PTFE): manufactured by Daikin Industries Lubron L-5, powder having an average particle diameter of 0.2 μm Potassium titanate whisker (KTW): “Tismo D-101” manufactured by Otsuka Chemical, average fiber diameter 0.3 to 0.6 μm
m, length 10-20 μm Graphite: “P5M-30” manufactured by Nippon Carbon Co., Ltd .: average particle size 5
μm In addition, the synthetic resin rolling element 3 and the crown-shaped cage 4
Except when aromatic polyimide (PI) was used, it was produced by injection molding. The molding of the aromatic polyimide (PI) was performed by sinter molding. The coatings 11, 21, and 51 are formed by dispersing a solid lubricant (80% by weight) and a binder made of a polyamide resin (20% by weight) in a solvent, spray-coating the dispersion, and forming a coating at a temperature of about 190 ° C. This was performed by firing for an hour.

Examples 1 to 10 and Comparative Examples 1 to
For the rolling bearing No. 3, a rotation test was performed using a bearing rotation tester manufactured by Nippon Seiko Co., Ltd. under the following conditions, and the bearing life was evaluated based on the vibration value. That is, the radial vibration generated in the bearing is constantly measured during the rotation test, and when the vibration value becomes three times or more of the initial value, the test is stopped.
The total number of rotations up to that point was taken as the life. Note that all the rolling bearings were not lubricated with grease. <Rotation test conditions> Atmospheric pressure: Atmospheric pressure Atmospheric temperature: Normal temperature Radial load: 49 N Rotational speed: 300 rpm Also, in order to compare the life of each test bearing, Comparative Example 1 was used.
The relative value when the life of the sample was "1" was calculated. These results are also shown in Table 1 below.

[0033]

[Table 1]

On the other hand, the inner ring, the outer ring, and the retainer were configured in the same manner as in Comparative Example 1 to assemble a rolling bearing in which the rolling elements were made of various synthetic resins, and a rotation test was performed under the conditions described above. The relative value when the life of the moving body was made of PC was "1" was calculated. For various synthetic resins constituting the rolling elements, a bending strength test according to “ASTM-D790” and a pressure 1.82 MPa according to “ASTM-D648” were conducted.
(18.6 kgf / cm ² ).

Here, as the synthetic resin material for the rolling elements 3, those described above and those shown below were used. Thermoplastic polyimide (TPI): "Auram 400" manufactured by Mitsui Toatsu Chemicals, Inc. Aromatic polyester: "Vectra A950" manufactured by Polyplastics, Inc. classified as liquid crystal polymer (LCP) Polyethylene (PE): manufactured by Mitsui Petrochemical Industries "Lubmar L5000" Polyamide (PA): Nylon 6 manufactured by Asahi Kasei Corporation
6 "Leona 1402S" The test results are shown in FIG. FIG. 2 is a graph showing the relationship between the thermal deformation temperature (vertical axis) of the various synthetic resins forming the rolling element, the bending strength (horizontal axis) of the various synthetic resins forming the rolling element, and the relative life of the bearing. is there.

As can be seen from Table 1 and the graph of FIG. 2, the bending strength according to "ASTM-D790" is 60MP.
a and a pressure of 1.82 according to ASTM-D648
Heat deformation temperature at 1 MPa (18.6 kgf / cm ² )
Rolling bearings using rolling elements made of synthetic resin satisfying both of 50 ° C. or more (Examples 1 to 10 in Table 1 and hatched portions in the graph of FIG. 2) are made of synthetic resin rolling elements that do not satisfy at least one of them. Rolling bearing using moving body (Comparative Examples 1 to 1 in Table 1)
3. Except for the shaded portion in the graph of FIG. 2), the rotational life at room temperature, in the atmosphere, and without lubrication is longer.

In the comparison between Examples 1 to 10, the rotational life was longer when the cage was a synthetic resin crown-shaped cage than when the cage was a metal (SUS304) waveform holder. It turns out that it is long. However, even in the case of a waveform retainer, the rotation life can be extended by providing a solid lubricant film. Further, by providing a coating of a solid lubricant on the inner ring and the outer ring, the rotational life can be prolonged. In addition, by including a solid lubricant in the rolling elements, the rotational life can be further extended. Further, by providing a coating of a solid lubricant on the inner ring and the outer ring, making the rolling elements contain a solid lubricant, and using a synthetic resin crown retainer, the rotational life can be particularly prolonged.

Next, P containing PTFE at various ratios
A rolling element was manufactured from I, PBI, or PPS, and rolling bearings each incorporating a rolling element having the same composition were assembled. Here, the above-mentioned PTFE, PI, PBI, and PPS were used. The inner ring, the outer ring, and the retainer had the same configuration as Comparative Example 1. Using each rolling bearing, a rotation test was performed under the above conditions, and a relative value was calculated when the life of Comparative Example 1 (the rolling element was made of PC) was "1". The result is shown in FIG. FIG. 3 is a graph showing the relationship between the PTFE content of the rolling element and the relative value of the rotational life.

As can be seen from the graph of FIG. 3, when the PTFE content in the rolling elements is 20% by weight or less, the rotational life of the bearing becomes longer as the amount of PTFE added increases.
If the PTFE content in the rolling elements exceeds 20% by weight, PT
As the amount of FE added increases, the rotational life of the bearing decreases. In particular, when the PTFE content in the rolling elements exceeds 30% by weight, it is difficult to obtain the effect of increasing the rotation life by adding PTFE, and the rotation life may be shorter than when no PTFE is added. Therefore, PT
When a solid lubricant such as FE is added, the content is preferably 30% by weight or less.

[0040]

As described above, according to the present invention,
Provided is a rolling bearing having a long life without using lubricating oil or grease for lubrication.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a test rolling bearing manufactured in an embodiment.

FIG. 2 shows the thermal deformation temperatures (vertical axis) of the various synthetic resins constituting the rolling elements, the bending strengths of the various synthetic resins constituting the rolling elements (horizontal axis), and the relative life of the bearings obtained in the embodiment. 6 is a graph showing a relationship with the graph.

FIG. 3 is a graph showing a relationship between a PTFE content of a rolling element and a relative value of rotational life obtained in the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer ring 2 Inner ring 3 Ball (rolling element) 4 Cage 5 Cage 11 Solid lubricant film 21 Solid lubricant film 51 Solid lubricant film

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3J101 AA02 AA32 AA34 AA42 AA62 BA10 CA12 EA02 EA31 EA34 EA35 EA36 EA37 EA41 EA52 EA53 FA06 FA32 GA55 4F071 AA27 AA51 AA60 AA62 AA69 AB03 AB23 AF17 AF17Y18 BC

Claims (1)

[Claims] At least one of the plurality of rolling elements is made of aromatic polyimide, thermoplastic polyimide, aromatic polyamideimide, polyphenylene sulfide, polyetheretherketone, polybenzimidazole, polyetheretherketone, and polybenzimidazole. And a synthetic resin containing at least one selected from the group consisting of a copolymer with a polyether imide, a polyether nitrile, and an aromatic polyester;
D790 "is 60 MPa or more,
The pressure according to "ASTM-D648" is 1.82 MPa (1
A rolling bearing having a heat deformation temperature at 8.6 kgf / cm ² ) of 150 ° C. or higher.