JP2002048142A - Rolling support system, rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling bearing well adapted for use under the environment where breeding of bacteria is to be avoided. SOLUTION: Outer surface of an outer ring 1 and an inner ring 2 both made of a stainless steel are applied with coatings 11, 21 having an iodine compound as an essential ingredient.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling support device such as a rolling bearing, a ball screw, and a linear guide, and more particularly, to an environment such as a food machine, a pharmaceutical machine, or a medical or sanitary machine in which bacteria do not grow. It relates to one suitable for use.

[0002]

2. Description of the Related Art A rolling bearing suitable for use in an environment in which bacteria do not grow is disclosed, for example, in Japanese Patent Application Laid-Open No. 9-229071.
No. 6,009,045. This publication describes that a thin film of a metal or a metal compound having antibacterial properties is coated on a surface that comes into contact with the usage environment of the bearing component.
Examples of the metal or metal compound having antibacterial properties include silver, titanium, copper, tin, and zinc, and metal compounds containing at least one of these.

[0003] In addition, since bacteria are difficult to propagate on a metal surface and easily propagate on an organic substance such as rubber or resin, the thin film is applied to a surface in contact with a use environment of a rubber or resin bearing component such as a seal member. It is described that by coating, the propagation of bacteria can be efficiently suppressed and environmental pollution can be prevented. Furthermore, it is described that the thin film is formed by an ion deposition thin film forming method or a helical sputtering method.

[0004]

However, the method described in the above publication has room for improvement in terms of the magnitude and sustainability of antibacterial performance. In addition, since the ion deposition thin film forming method and the helical sputtering method use a vacuum system, there is room for improvement in cost. The present invention has been made in view of such problems of the related art, and provides a rolling support device that is suitable for use in an environment in which bacterial growth is disliked and that has high antibacterial performance and a long life. That is the task.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a fixing device having a rolling element and a trajectory of the rolling element which are interposed between a fixed body and a moving body. In a rolling support device including at least each of a track member fixed to a body side and a moving body side, and the rolling body rolling on a track to allow movement of the moving body with respect to the fixed body, the surface of the component is iodine or iodine. A rolling support device characterized by being covered with a coating containing a compound as a main component.

The coating may be formed on at least the surface of the component which is in contact with an atmosphere in which bacteria are easily generated. When the rolling support device has a retainer or a seal, the coating may be formed thereon.
The coating has a higher antibacterial property (antibacterial property against Escherichia coli, Staphylococcus aureus, various molds, etc.) than the thin film described in JP-A-9-229071. Further, since the coating has lubricity, by forming this coating on the raceway surface of the rolling element and / or the raceway member, a long life can be obtained without using lubricating oil or grease. On the other hand, by forming the surface layer portion or the whole of the rolling element with a ceramic material, a longer life can be obtained as compared with the case where the rolling element is formed with a metal material.

[0007] The coating can be formed on the surface of the component by an electrophoretic electrodeposition method. Since this method does not use a vacuum system, a film can be formed at a lower cost as compared with the ion deposition thin film forming method and the helical sputtering method. Iodine compounds that can be used in the present invention,
Inorganic iodine compounds, compounds of chain saturated hydrocarbons or derivatives thereof and iodine, compounds of chain unsaturated hydrocarbons and iodine, compounds of aromatic hydrocarbons or derivatives thereof and iodine, polymers containing iodine being classified. The following are examples of iodine compounds that can be used in the present invention for each classification.

[0008] potassium iodide (KI), zinc iodide (ZnI _2), not to iodide (SnI _2), iodide cadmium (CdI _2), iron iodide (FeI _2), nickel iodide (NiI _2), iodide chromium (CrI _3). As a mono-conjugate in which one iodine is bonded, methyl iodide, ethyl iodide, propyl iodide, isopropyl iodide, butyl iodide, isobutyl iodide, amyl iodide, hexyl iodide, heptyl iodide, iodide Octyl, cetyl iodide, octadecyl iodide. Examples of di-bonds in which two iodines are bonded include methylene iodide, ethylene iodide, ethylidene iodide, triethylene iodide, tetraethylene iodide, pentaethylene iodide, hexaethylene iodide, hexaethylene iodide, isopropenyl iodide, iodine Acetamide, acetyl iodide, succinic iodide, tetraethyl iodide, and tetramethyl iodide.

[0009] Vinyl iodide, allyl iodide, crotyl iodide, polopargyl iodide, phenylacetylene iodide. Benzene iodide, benzyl iodide, benzoyl iodide, phenacyl iodide, xylylene iodide, phthalein iodide, hydroquinone iodide. Trimethylsulfonium iodide, triphenylsulfonium iodide, methyltriphenylarsonium iodide.

[0010] polyvinylpyrrolidone iodine, polyvinyl phthalimide iodine, polyvinyl butyral iodine,
Polyvinyl formal iodine. The present invention is also provided between the fixed body and the moving body, as a component, a rolling element,
A rolling support device having at least a track member having a track of the rolling element and fixed to the fixed body side and the moving body side, wherein the rolling body rolls on the track to allow the moving body to move relative to the fixed body; A track support member whose surface is a rolling surface with respect to another member is made of a thermoplastic resin containing an antibacterial agent.

A track member whose outer peripheral surface is a rolling surface with respect to another member (for example, an outer ring of a rolling bearing for a conveyor) is easily worn on the outer peripheral surface. When the thin film is provided, the antibacterial performance may be impaired in a relatively short time. On the other hand, by forming this raceway member from a thermoplastic resin containing an antibacterial agent, antibacterial performance can be maintained for a long period of time.

Further, since the raceway member formed of a thermoplastic resin has higher lubricity than the raceway member made of metal, a long life can be obtained without using lubricating oil or grease. On the other hand, by forming the surface layer portion or the whole of the rolling element with a ceramic material, a longer life can be obtained as compared with the case where the rolling element is formed with a metal material. The antimicrobial agent contained in the thermoplastic resin includes (1) a metal made of silver, copper, or zinc, (2) an inorganic antimicrobial agent containing silver, copper, or zinc, (3) alumina, (4) an organic type. Antibacterial agents (isothiazoline-based, benzoic acid-based) and (5) the above-mentioned iodine compounds. These may be added alone or in combination of two or more to the thermoplastic resin. These antimicrobial agents
It is practically harmless to humans and animals, does not wash away with water, does not corrode metals, is odorless, and has heat resistance enough to be kneaded into resin.

The inorganic antibacterial agents classified into (2) include:
Zirconium phosphate, zeolite, hydroxyapatite, phosphate glass and phosphate ceramics containing silver, copper or zinc are preferred. When an antibacterial agent comprising alumina is used, the antibacterial activity can be significantly improved by adding an alkali compound together with alumina.

The alkali compounds include alkali metals (Li, Na, K, Rb, Cs, etc.), alkaline earth metals (Be, Mg, Ca, Sr, Ba, etc.), and these compounds (hydroxides, hydroxides, etc.). Carbonates, bicarbonates, carboxylates, oxalates, salts with phenols, alkoxides, etc.)
And amine compounds and quaternary ammonium compounds. Among them, it is preferable to use an amine compound from the viewpoint of water resistance. This amine compound is exemplified below.

Methylamine, ethylamine, propylamine, butylamine, propylamine, pentylamine, hexylamine, heptylamine, octylamine, decylamine, laurylamine, myristylamine, palmitylamine, stearylamine, coconutamine, tallowamine, etc. Alkyl primary amines. Dimethylamine, diethylamine, dipropylamine, cybutylamine, dioctylamine, didecylamine, dilaurylamine, dimyristylamine, dipalmitylamine, methylstearylamine, distearylamine, octylated diphenylamine, N, N′-diphenyl-p
Alkyl secondary amines such as phenylenediamine and N-phenyl-N'-isopropyl-p-phenylenediamine.

Alkyl such as trimethylamine, triethylamine, tributylamine, trioctylamine, dimethyloctylamine, dimethyldecylamine, dimethyllaurylamine, dimethylmyristylamine, dimethylpalmitylamine, dimethylstearyl, dilaurylmonomethylamine, and trioctylamine Tertiary amine.

Polyamines such as stearyl propylene diamine, tallow propylene diamine, ethylene diamine, propylene diamine, hexamethylene diamine, hexamethylene, and tetramine. Alkanolamines such as ethanolamine, diethanolamine and triethanolamine. The following pyridines and the like. Pyridine, picoline, ethyl pyridine, propyl pyridine, butyl pyridine, lutidine, koluidine, methyl ethyl pyridine,
Diethylpyridine, methylbutylpyridine, dipropylpyridine, C8 to C20 alkylpyridine, methylethylpropylpyridine, picolinamide, isonicotinamide, aminopyridine, diaminopyridine, triaminopyridine, aminomethylpyridine, aminoethylpyridine, aminopropyl Pyridine, aminodimethylpyridine, diaminomethylpyridine, dipyridyl, 2,2'-
Dipyridylamine.

4-dimethylaminopyridine, 4-pyrrolidinopyridine, 4-piperidinopyridine, hydroxypyridine, dihydroxypyridine, hydroxymethylpyridine, chloropyridine, cyanopyridine, pyridinemethanol, pyridinedimethanol, pyridineethanol,
Methylpyridine ethanol, 2- (2-pyridyl)-
1,3-propanediol, 2-pidroxymethyl-2
-(4-pyridyl) -1,3-propanediol, methoxyethylpyridine, aminomethylpyridine, pyridylacetone, bis-2-picolylamine, alkylaminomethylpyridine, phenylpyridine, benzylpyridine, quinoline, cyclopentenopyridine] , 3-di-
(4-pyridyl) propane, 2,4,6-tree (4-
Pyridyl) -s-triazine.

As the polymer having an amino group, vinyl pyridine polymer, polyhexamethylene picuanide,
Polyallylamine, polydimethylaminoethyl methacrylate and the like. In addition, anilines, morpholines, guanidines, piguanides, and the like can also be used. From the viewpoint of water resistance, among the above-mentioned amine compounds, amine compounds having 6 or more carbon atoms are more preferable. Primary amines, secondary amines and tertiary amines having strong basicity are more preferred.

The thermoplastic resins usable in the present invention include polyethylene (PE), polypropylene (PP),
Polyacetal (POM), polyamide (PA), polyarylene sulfide resin represented by polyphenylene sulfide (PPS), polyetheretherketone (PEEK), and various fluorine resins are preferred. Examples of the fluororesin include tetrafluoroethylene-perfluoroalkylvinyl ether copolymer (PFA), tetrafluoroethylene-ethylene copolymer (ETFE), polyvinylidene fluoride (PVDF), and tetrafluoroethylene-hexafluoropropylene copolymer (FE
P), polychlorotrifluoroethylene (PCTF
E), chlorotrifluoroethylene-ethylene copolymer (ECTFE) and the like.

The content of the antibacterial agent in the thermoplastic resin is 0.1%.
It is preferably from 3% by weight to 30% by weight. When the content of the antibacterial agent is less than 0.3% by weight, the effect of preventing and suppressing the propagation of various bacteria cannot be substantially obtained. When the content of the antibacterial agent exceeds 30% by weight, mechanical strength, abrasion resistance, hardness, and impact resistance required as components of the rolling support device become insufficient. The more preferable content of the antibacterial agent in the thermoplastic resin is from 0.5% by weight to 25% by weight, and the more preferable content is from 0.8% by weight to 20% by weight.

In order to uniformly disperse the antimicrobial agent in the thermoplastic resin, the antimicrobial agent is previously adsorbed on a fine inorganic carrier,
The carrier having the antibacterial agent adsorbed thereon may be blended with the thermoplastic resin. As this carrier, alumina, titania, zirconia, zeolite, silica, diatomaceous earth, calcium carbonate, calcium phosphate (such as calcium phosphate apapite or tricalcium phosphate) can be used.

In order to improve the mechanical strength, heat resistance, dimensional stability, abrasion resistance, etc., a fibrous filler or a solid lubricant may be added to the thermoplastic resin together with the antibacterial agent. The following can be exemplified as the fibrous filler. Aluminum borate whisker, potassium titanate whisker, carbon whisker, aramid fiber, aromatic polyimide fiber, liquid crystal polyester fiber, graphite whisker, glass fiber, carbon fiber, polon fiber, silicon carbide whisker, silicon nitride whisker, alumina whisker, aluminum nitride Whisker, wollastonite, etc.

Examples of the solid lubricant include the following. Polytetrafluoroethylene (PTFE) powder, amino acid compound having a layered crystal structure (N-lauro-L-lysine), melamine cyanurate (MCA), hexagonal boron nitride (hBN), fluoromica, fluorinated graphite, fluorine Pitch, graphite. By adding these alone or in combination of two or more, more suitable lubricating properties can be obtained. Various additives may be added to the thermoplastic resin as long as the object of the present invention is not impaired. The additives include an antioxidant, a heat stabilizer, an ultraviolet absorber, a light protectant, a flame retardant, an antistatic agent, a fluidity improver, a non-tackifier, a crystallization accelerator, a nucleating agent, and a pigment. And dyes.

The following method can be used as a method for incorporating an antimicrobial agent (as necessary, a solid lubricant, a fibrous filler, and various additives) into the thermoplastic resin. A method in which a thermoplastic resin and an antibacterial agent are separately melt-kneaded. A method in which each material is preliminarily mixed by a mixer such as a Henschel mixer, a tumbler, a ribbon mixer, and a ball mill, and then supplied to a 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 the time of melt-kneading may be appropriately selected within a temperature range in which the thermoplastic resin sufficiently melts and does not decompose. The present invention also provides a rolling bearing, wherein the cage is made of a resin composition containing a fiber containing an antibacterial agent. As described above, by adding fibers (fibrous filler) to the resin, the mechanical strength and the like of the molded body can be improved. According to this rolling bearing, by using a fiber containing an antibacterial agent as this fiber, while improving the mechanical strength and the like of the cage,
Antibacterial properties can be imparted to the retainer.

According to the present invention, a rolling element and track members having orbits of the rolling element and fixed to the fixed body side and the moving body side, respectively, are interposed between the fixed body and the moving body. At least, in a rolling support device that allows the moving body to move relative to the fixed body by the rolling element rolling and moving on the track, the track member whose outer peripheral surface is a rolling surface with respect to another member includes a fiber containing an antibacterial agent. A rolling support device characterized by comprising a resin composition containing:

As described above, a raceway member whose outer peripheral surface is a rolling surface with respect to another member (for example, an outer ring of a rolling bearing for a conveyor) is liable to wear on its outer peripheral surface. When the thin film described in the above publication is provided, the antibacterial performance may be impaired in a relatively short time. On the other hand, by forming this track member from a resin composition containing fibers containing an antibacterial agent, antibacterial performance can be maintained for a long period of time. Further, similarly to the rolling bearing, by using a fiber containing an antibacterial agent as a fiber to be added in order to improve the mechanical strength and the like of the molded body, while improving the mechanical strength and the like of the track member, Antibacterial properties can be imparted to the track member.

Examples of the resin constituting the resin composition forming the retainer and the track member include the above-mentioned thermoplastic resins. As fibers constituting the resin composition, potassium titanate whiskers, aluminum borate whiskers, carbon whiskers, aramid fibers,
Examples include aromatic polyimide fibers, liquid crystal polyester fibers, graphite whiskers, glass fibers, carbon fibers, boron fibers, silicon carbide whiskers, silicon nitride whiskers, alumina whiskers, aluminum nitride whiskers, and wollastonite. Among these, potassium titanate whiskers and aluminum borate whiskers are less likely to damage the rolling elements even when the rolling elements are formed of a material that is easily damaged, such as glass, and can extend the life of the rolling support device. Therefore, it is particularly preferable.

As the antibacterial agent to be contained in the fiber, (1)
Metals composed of silver, copper, or zinc, (2) inorganic antibacterial agents containing silver, copper, or zinc, (3) alumina, and (4) organic antibacterial agents (isothiazoline-based, benzoic acid-based).
These are used alone or in combination of two or more to be contained in the fiber. The method of incorporating the antibacterial agent into the fiber includes the method of infiltrating the dispersion of the antibacterial agent from the surface of the fiber into the inside, the method of coating the surface of the fiber with the antibacterial agent, and adding the antibacterial agent during spinning to obtain the original yarn itself. And the like. In addition, since fibers containing an antibacterial agent are also commercially available as antibacterial fibers, they can be easily obtained.

The aspect ratio of the fiber is preferably from 3 to 200. If the aspect ratio is less than 3, the reinforcing effect of the resin molded product is not sufficiently exhibited, and if the aspect ratio exceeds 200, uniform dispersion during mixing becomes extremely difficult. The fiber diameter 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.
If the average fiber diameter is less than 0.2 μm, coagulation between the fibers may occur when mixed with the resin, and the dispersion of the fibers may be non-uniform. If it exceeds 30 μm, the smoothness of the surface of the molded body is impaired, and there is a possibility that the sliding partner surface may be damaged.

The fiber content in the resin composition is 5% by weight.
It is preferable that the content be at least 40% by weight. If the amount is less than 5% by weight, the effect of improving the wear resistance and mechanical strength of the molded article is hardly recognized. 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. A more preferred range is from 10% by weight to 30% by weight.

The relationship between the fiber content in the resin composition and the antibacterial performance is determined by the content of the antibacterial agent in the fiber. For example, in the case of a fiber containing 15% by weight of silver, the resin composition of the fiber is The content in the product is preferably 5% by weight or more and 40% by weight or less, more preferably 10% by weight or more and 30% by weight or less. Therefore, in the case of the fiber containing 15% by weight of silver, the content of the fiber in the resin composition is set to 5% by weight or more and 40% by weight or less, preferably 10% by weight or more and 30% by weight or less. Abrasion resistance, mechanical strength and antibacterial performance of the body can be improved.

[0034]

Embodiments of the present invention will be described below. [First Embodiment] <Evaluation test of antibacterial property> As a test piece, (1) SUS304
Plate (shield plate of a single row deep groove ball bearing with a shield number 6000ZZ), (2) the same shield plate coated with a 30 μm thick silver zeolite coating, (3) the same shield plate 30 μm thick (4) Thickness of 30 on the same shield plate
One having a μm-thick polyvinyl phthalimide iodine coating, and (5) one having the same shield plate coated with a 30 μm-thick methylene iodide coating were prepared.

The test piece (2) was prepared as follows.
First, the SUS304 shield plate is degreased by washing with a solvent. Next, after performing ultrasonic cleaning, hot-dip galvanizing is performed to form an acrylic-urethane coating film containing 20% by weight of silver zeolite on the hot-dip galvanized layer. As a result, a silver zeolite coating is formed on the surface of the shield plate.

Test pieces (3) to (5) were prepared as follows. First, the SUS304 shield plate is degreased by washing with a solvent. Next, after performing ultrasonic cleaning, anodizing treatment is performed to form a hard oxide film on the surface of the shield plate. Next, fine holes are formed on the surface of the oxide film by performing electrolytic etching. Next, electrophoretic electrodeposition is performed using polyvinylpyrrolidone iodine in (3), polyvinylphthalimide iodine in (4), and methylene iodide in (5). As a result, iodide is attached to and impregnated into the fine pores on the surface of the oxide film, and an iodide film is formed on the surface of the shield plate.

These test pieces were placed in a sterile petri dish, and 0.5 ml of a bacterial solution was sprayed on the surface of the test pieces, and then a polyester film was placed thereon. This petri dish was heated to
It was left for 24 hours in an atmosphere at a relative humidity of 90 ° C. The bacterial solution used was usually a broth medium in phosphate buffered solution of 500 ml.
After dilution by a factor of 1, the E. coli (IF03972)
Are uniformly dispersed so as to be 1.0 to 1.5 × 10 ⁵ per ml.

Next, the film in the Petri dish left for 24 hours in the above atmosphere was washed with 10 ml of SCDLP medium solution.
E. coli adhered to this film by washing with S
Transferred to CDLP medium. Then, the number of Escherichia coli contained in this liquid was examined by an agar plate culture method using an SA medium. The number of E. coli thus examined (A) and the number of E. coli contained in 0.5 ml of the used bacterial solution (B)
Was used to calculate the ratio (A / B) of the two. Next, for the ratio of each test piece, the ratio of the test piece (1) was 1000
Was calculated. The results are shown in Table 1 below. The smaller the antibacterial property value (relative value), the higher the antibacterial performance.

[0039]

[Table 1]

As can be seen from the results, the antibacterial performance of the polyvinylpyrrolidone iodine coating, the polyvinyl phthalimide iodine coating and the methylene iodide coating is superior to that of the silver zeolite coating. <Life Test (Part 1)> As a rolling bearing for testing, a single row deep groove ball bearing corresponding to the nominal number 6000 (inner diameter 10 m)
m, outer diameter 26 mm, width 8 mm). As shown in FIG. 1, this bearing includes an outer ring (track member) 1, an inner ring (track member) 2, a ball (rolling element) 3, and a crown-shaped cage 4, and is not provided with a seal.

Table 2 below shows the constituent materials of the inner ring, outer ring, and rolling elements of each bearing. The same material was used for the inner ring and the outer ring for each sample. As shown in Table 2, No. 1-1 to 1-3
In this example, coatings 11 and 21 made of iodide (polyvinyl pyrrolidone iodine or polyvinyl phthalimide iodine) are formed on the surfaces of the outer ring 1 and the inner ring 2 made of SUS440C. In No. 1-5, silver coatings 11 and 21 are formed on the surfaces of the outer ring 1 and the inner ring 2 made of SUS440C.

Each of these films has a thickness of 30 μm.
m. The method for forming a film made of iodide was performed in the same manner as described above. The silver coating was formed by a helical sputtering method. The cage 4 is made of a resin composition (PVDF80) composed of PVDF and potassium titanate whiskers.
(Weight% + potassium titanate whisker 20 weight%).

Each of the assembled rolling bearings was subjected to a rotation test in ion-exchanged water under the following conditions using a bearing rotation tester manufactured by Nippon Seiko Co., Ltd. to evaluate the bearing life based on the vibration value. That is, the radial vibration generated in the bearing was constantly measured during the rotation test, and when the vibration value became three times or more the initial value, the test was stopped, and the total number of rotations up to that time was regarded as the life. Note that all the rolling bearings were not lubricated with lubricating oil and grease.

The rotation test conditions are as follows. Atmospheric pressure: Atmospheric pressure Atmospheric temperature: Normal temperature Radial load: 49 N Rotational speed: 200 rpm In addition, in order to compare the life of each test bearing, the life of No. 1-4 equivalent to the conventional all-metal rolling bearing was calculated. The relative value when "1" was set was calculated. These results are also shown in Table 2 below.

[0045]

[Table 2]

As can be seen from the results, SUS440
Nos. 1-1 to 1-3 in which a coating made of iodide (polyvinyl pyrrolidone iodine or polyvinyl phthalimide iodine) is formed on the surfaces of the inner and outer rings made of C
Of the rolling bearing in ion-exchanged water was 15 to 50 times that of the rolling bearing of No. 1-4 in which the inner and outer rings were made of SUS440C.

On the other hand, the rotation life of the No. 1-5 No. 1-5 having a silver coating on the surface of the inner and outer rings made of SUS440C in ion-exchanged water is as follows.
It was five times that of the No. 1-4 rolling bearing made of C. In addition, from the comparison between No. 1-1 and No. 1-3, it is found that the use of the ceramic rolling element further increases the rotational life of the rolling bearing in ion-exchanged water. <Life Test (Part 2)> A test was conducted to examine the difference in life depending on the thickness of the coating.

As a test rolling bearing, a reference number 60
A single row deep groove ball bearing corresponding to 00 was assembled. As the inner ring and the outer ring, a coating made of polyvinylpyrrolidone iodine was formed on the inner ring and the outer ring which were made of SUS440 and which had been quenched and tempered, with respective thicknesses shown in Table 3 below. The coating was formed in the same manner as described above. The thickness of the coating was varied by changing the time for electrophoretic electrodeposition. The retainer is made of a resin composition composed of PVDF and potassium titanate whisker (PVDF 80% by weight + potassium titanate whisker 20% by weight)
It was produced by injection molding. A rolling element made of silicon nitride was prepared.

Each of the assembled rolling bearings was subjected to a rotation test in ion-exchanged water under the same conditions as described above.
The life was measured. In order to compare the life of each test bearing, L10 of No.1-20 without coating was applied to the inner and outer rings.
The relative value when the life was set to "1" was calculated. The results are shown in Table 3 below. FIG. 2 shows the relationship between the thickness of the coating applied to the inner ring and the outer ring and the life.

[0050]

[Table 3]

As can be seen from the results, when the thickness of the coating is 1 to 100 μm, a life that is 15 times or more that of No. 1-25 can be obtained. When the thickness of the coating is less than 1 μm, the coating tends to be non-uniform, and it is difficult to obtain sufficient corrosion resistance. When the thickness of the coating exceeds 100 μm, not only does the time required for forming the coating become long, but also the strength of the coating decreases. Therefore, when a coating is provided on the inner ring and the outer ring, the thickness of the coating is 1 to 100 μm, preferably 10 to 75 μm.

From the above, the inner ring and the outer ring are iodinated.
Rolling bearings with a coating of
Ion-exchange compared to those without a coating
High antibacterial performance and long service life when used in
It is understood that it can be done. Therefore, this rolling bearing
It can be suitably used in an environment where the propagation of bacteria is disliked. [Second embodiment] <Evaluation test of antibacterial property> Each test was performed using each material shown in Table 4.
A piece (50 mm × 50 mm × thickness 3 mm) was prepared. Trial
In test piece (6), silver powder (manufactured by Wako Pure Chemical Industries) was used as the carrier.
Ca_Three(PO _Four)_TwoAdsorbed on particles (made by Wako Pure Chemical Industries)
The carrier particles are converted to PE (“Suntech-HDJ310” Asahi
Chemical Industry Co., Ltd.) has a silver content of 5% by weight.
Contained.

For the test piece (7), "Duracon M140" manufactured by Polyplastics was used as the POM. In the test piece (8), “Showa Allomer MK211” manufactured by Showa Denko KK was used as PP, and “Farmin DDM2463” manufactured by Kao Corporation was used as dimethyl laurylamine. In the test pieces (7) and (8), alumina (manufactured by Wako Pure Chemical Industries, Ltd.) was used.

The test pieces (6) to (8) and (10) were formed by injection molding. The test piece was formed by cutting out a plate material having a thickness of 3 mm. These test pieces were placed in a sterile petri dish, and 0.5 ml of the bacterial solution was sprayed on the surfaces of the test pieces, and then a polyester film was placed thereon. This petri dish was left in an atmosphere at a temperature of 40 ° C. and a relative humidity of 90% for 24 hours.
The used bacterial solution was prepared by diluting a broth medium 500 times with a phosphate buffer solution, and adding E. coli (IF039
72) is uniformly dispersed so as to be 1.0 to 1.5 × 10 ⁵ per 1 ml.

Next, the above-mentioned film in the petri dish left for 24 hours in the above-mentioned atmosphere was washed with 10 ml of SCDLP medium solution.
E. coli adhered to this film by washing with S
Transferred to CDLP medium. Then, the number of Escherichia coli contained in this liquid was examined by an agar plate culture method using an SA medium. The number of E. coli thus examined (A) and the number of E. coli contained in 0.5 ml of the used bacterial solution (B)
Was used to calculate the ratio (A / B) of the two. Next, for the ratio of each test piece, the ratio of the test piece (9) was 1000
Was calculated. The results are shown in Table 4 below. The smaller the antibacterial property value (relative value), the higher the antibacterial performance.

[0056]

[Table 4]

As can be seen from the results, the test pieces (6) to (8) made of the thermoplastic resin containing the antibacterial agent
Higher antibacterial performance is obtained than the test piece (9) made of 440C and the test piece (10) made of a thermoplastic resin containing no antibacterial agent. <Life Test (Part 1)> As a rolling bearing for testing, a single row deep groove ball bearing corresponding to the nominal number 6000 (inner diameter 10 m)
m, outer diameter 26 mm, width 8 mm). As shown in FIG. 3, the bearing includes an outer ring (track member) 1, an inner ring (track member) 2, a ball (rolling element) 3, and a crown-shaped cage 4, and is not provided with a seal.

Table 5 below shows the constituent materials of the inner ring, outer ring and rolling elements of each bearing. As shown in Table 5, No. 2-2 and N
In o. 2-3, the outer ring 1 and the inner ring 2 are formed of a thermoplastic resin containing an antibacterial agent. In No. 2-1, the outer ring 1 is formed of a thermoplastic resin containing an antibacterial agent, while the inner ring 2 is made of SUS440C. Therefore, N
o. 2-1 to 2-3 correspond to Examples of the present invention. No.
2-4 to 2-6, since neither the outer ring 1 nor the inner ring 2 is formed of a thermoplastic resin containing an antibacterial agent,
This corresponds to a comparative example of the present invention. The retainer 4 is a PVD
F and potassium titanate whisker (PVDF 80% by weight + potassium titanate whisker 2)
0% by weight) by injection molding.

Each assembled rolling bearing was subjected to a rotation test in ion-exchanged water under the following conditions using a bearing rotation tester manufactured by Nippon Seiko Co., Ltd., and the bearing life was evaluated based on the vibration value. That is, the radial vibration generated in the bearing was constantly measured during the rotation test, and when the vibration value became three times or more the initial value, the test was stopped, and the total number of rotations up to that time was regarded as the life. Note that all the rolling bearings were not lubricated with lubricating oil and grease.

The rotation test conditions are as follows. Atmospheric pressure: Atmospheric pressure Atmospheric temperature: Normal temperature Radial load: 49 N Rotational speed: 200 rpm In order to compare the life of each test bearing, the life of No. 2-4 equivalent to the conventional all-metal rolling bearing was calculated. The relative value when "1" was set was calculated. These results are also shown in Table 5 below.

[0061]

[Table 5]

As can be seen from the results, the rotation life in ion-exchanged water is equal to that of the embodiment of the present invention.
o. The rolling bearings Nos. 2-1 to 2-3 can obtain the same or better performance as the rolling bearings Nos. 2-4 to 2-6 corresponding to the comparative examples of the present invention. In addition, it can be seen that the use of the ceramic rolling element further increases the rotational life of the rolling bearing in ion-exchanged water. <Life Test (Part 2)> A test was conducted to examine the difference in life due to the difference in the antimicrobial agent content in the thermoplastic resin forming the inner ring and the outer ring.

As a test rolling bearing, a reference number 60
A single row deep groove ball bearing corresponding to 00 was assembled. The inner ring and the outer ring were prepared by injection molding with a material composed of 100% POM and injection molded with a material obtained by adding alumina as an antibacterial agent to POM at various contents. As the retainer, one prepared by injection molding using a resin composition composed of PVDF and potassium titanate whisker (PVDF 80% by weight + potassium titanate whisker 20% by weight) was prepared. As rolling elements, S
What consisted of US440C was prepared. Each rolling bearing was assembled by combining an inner ring and an outer ring having the same alumina content.

Each of the assembled rolling bearings was subjected to a rotation test in ion-exchanged water under the same conditions as described above.
The life was measured. In order to compare the lifespans of the test bearings, a relative value was calculated when the L10 lifespan of the rolling bearing having the inner and outer rings injection-molded with a material composed of 100% POM was "1". The results are shown in FIG. 4 as a graph showing the relationship between the alumina content in the thermoplastic resin and the life.

As can be seen from the results, when the alumina content exceeds 30% by weight, the life of the rolling bearing is extremely reduced. From the above, by forming the bearing ring of a rolling bearing with a thermoplastic resin containing an antibacterial agent in a range of 30% by weight or less, high antibacterial performance and long life can be obtained when used in ion-exchanged water. You can see that.
Therefore, the rolling bearing of this embodiment can be suitably used in an environment where bacteria do not grow.

Also, like a rolling bearing for a conveyor,
When a high rolling load accompanied by vibration is applied to the outer peripheral surface of the outer ring, and the outer peripheral surface of the outer ring is easily worn out, the entire outer ring may be formed of a thermoplastic resin containing an antibacterial agent or SUS4.
By providing a layer (for example, a layer having a thickness of 1 mm or more) made of a thermoplastic resin containing an antibacterial agent on the outer peripheral portion of the outer ring formed of 40C or the like by insert molding or the like,
The wear life can be effectively extended. Third Embodiment <Evaluation Test of Antibacterial Property> Using the materials shown in Table 6, each test piece (50 mm × 50 mm × thickness 3 mm) was produced. In the test pieces (11) to (15), as the fiber containing the antibacterial agent, potassium titanate fiber containing 15% by weight of silver (“Baicam AK” manufactured by Otsuka Chemical Co., Ltd., average fiber diameter 0.3 to 0) .6
.mu.m, average fiber length of 10 to 20 .mu.m), and a material in which this fiber was contained in each thermoplastic resin at each content rate was used.

As the PE among the thermoplastic resins used, "Suntech-HDJ310" manufactured by Asahi Kasei Corporation is used.
Was used. As the POM, "Duracon M140" manufactured by Polyplastics was used. As the PPS, “FORTRON 0220A9” manufactured by Polyplastics was used. Kureha KF Polymer T- # 850 manufactured by Kureha Chemical Industry was used as PVDF.

The test pieces (11) to (15) were formed by injection molding. The test piece (16) was formed by cutting out a plate material having a thickness of 3 mm. Using these test pieces, the number (A) of Escherichia coli was determined in the same manner as in the second embodiment.
Using the number (B) of E. coli contained in 5 ml, the ratio (A / B) of both was calculated. Next, with respect to the ratio of each test piece, a relative value when the ratio of the test piece (16) was set to 1000 was calculated. The results are shown in Table 6 below. The smaller the antibacterial property value (relative value), the higher the antibacterial performance.

[0069]

[Table 6]

As can be seen from the results, a test piece made of a thermoplastic resin containing silver-containing potassium titanate fiber
(11) to (15) have higher antibacterial performance than the test piece (16) made of SUS440C. <Life Test (Part 1)> As a rolling bearing for testing, a single row deep groove ball bearing corresponding to the nominal number 6000 (inner diameter 10 m)
m, outer diameter 26 mm, width 8 mm). As shown in FIG. 3, the bearing includes an outer ring (track member) 1, an inner ring (track member) 2, a ball (rolling element) 3, and a crown-shaped cage 4, and is not provided with a seal.

Table 7 below shows the constituent materials of the inner ring, outer ring, and rolling elements of each bearing. As shown in Table 7, No. 3-2 to No. 3
In -5, the outer ring 1 and the inner ring 2 are formed of a thermoplastic resin containing silver-containing potassium titanate fiber. No.
In 3-1, the outer ring 1 is formed of a thermoplastic resin containing silver-containing potassium titanate fiber, while the inner ring 2 is made of SU.
It is made of S440C. Therefore, No. 3-1 to 3-5
Corresponds to an embodiment of the present invention. No. 3-6 is a conventional all-metal rolling bearing, which corresponds to a comparative example of the present invention. The retainer 4 is made of a resin composition (PVDF 80% by weight + PVDF and silver-containing potassium titanate fiber).
It was produced by injection molding using silver-containing potassium titanate fiber (20% by weight).

Each of the assembled rolling bearings was subjected to a rotation test in ion-exchanged water in the same manner as in the second embodiment, and the bearing life was evaluated based on the vibration value. In addition, in order to compare the lifespan of each test bearing, a relative value was calculated when the lifespan of No. 3-6 was "1". These results are also shown in Table 7 below.

[0073]

[Table 7]

As can be seen from the results, the rotational life in ion-exchanged water is equal to that of the embodiment of the present invention.
o. The rolling bearings Nos. 3-1 to 3-5 can obtain better performance than the rolling bearing No. 3-6 corresponding to the comparative example of the present invention. In addition, it can be seen that the use of the ceramic rolling element further increases the rotational life of the rolling bearing in ion-exchanged water. <Life Test (Part 2)> A test was conducted to examine the difference in life due to the difference in the content of silver-containing potassium titanate fibers in the thermoplastic resin forming the inner ring and the outer ring.

As a test rolling bearing, a reference number 60
A single row deep groove ball bearing corresponding to 00 was assembled. As the inner and outer rings, various thermoplastic resins (PE, POM, P
PS, PVDF) injection molded with 100% material and various thermoplastic resins (PE, POM, PPS,
Injection molded materials were prepared by adding silver-containing potassium titanate fibers to PVDF) at various contents.

A cage prepared by injection molding using a resin composition comprising PVDF and silver-containing potassium titanate fiber (PVDF 80% by weight + silver-containing potassium titanate fiber 20% by weight) was prepared. A rolling element made of SUS440C was prepared. Each rolling bearing was assembled by combining an inner ring and an outer ring having the same silver-containing potassium titanate fiber content.

Each of the assembled rolling bearings was subjected to a rotation test in ion-exchanged water under the same conditions as described above.
The life was measured. In order to compare the lifespan of the test bearings, a relative value was calculated when the L10 life of the rolling bearing of No. 3-6 (conventional all-metal rolling bearing) was set to "1". The results are shown in FIG. 5 as a graph showing the relationship between the content of the silver-containing potassium titanate fiber in the thermoplastic resin and the life.

As can be seen from this graph, when the content of the silver-containing potassium titanate fiber in the thermoplastic resin forming the race exceeds 40% by weight, the life of the rolling bearing is extremely reduced. As can be seen from this graph, from the viewpoint of the life of the rolling bearing, the content of the silver-containing potassium titanate fiber in the thermoplastic resin forming the race is 5 to 40% by weight.
, And particularly preferably 10 to 30% by weight. This is the same in the case of the cage.

From the above, all of the inner race, the outer race and the cage contain silver-containing potassium titanate fiber (fiber containing an antibacterial agent) in a range of 40% by weight or less (preferably 10 to 10%).
It can be seen that a rolling bearing made of a thermoplastic resin containing 30% by weight) has high antibacterial performance and a long life when used in ion-exchanged water. Therefore, the rolling bearing of this embodiment can be suitably used in an environment where bacteria do not grow.

In each of the above embodiments, a rolling bearing is described as an example of a rolling support device. However, the present invention can be applied to a rolling support device other than a rolling bearing (for example, a ball screw or a linear guide). .

[0081]

As described above, according to the rolling support device of the present invention, a high antibacterial performance and a long life can be obtained, so that the rolling support device can be suitably used in an environment where bacteria do not grow. Also,
ADVANTAGE OF THE INVENTION According to the rolling bearing of this invention, the rolling bearing provided with the retainer by which both the mechanical strength improvement and the antimicrobial property provision were performed by the fiber is provided.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a rolling bearing corresponding to a first embodiment of the present invention.

FIG. 2 is a graph showing the relationship between the thickness of the coating applied to the inner ring and the outer ring and the life obtained in the first embodiment.

FIG. 3 is a schematic sectional view showing a rolling bearing corresponding to a second embodiment of the present invention.

FIG. 4 is a graph showing the relationship between the content of an antibacterial agent (alumina) contained in a thermoplastic resin (POM) forming an inner ring and an outer ring and a life obtained in a second embodiment.

FIG. 5 shows the relationship between the content of silver-containing potassium titanate fibers (fibers containing an antibacterial agent) contained in thermoplastic resin forming the inner ring and the outer ring and the life obtained in the third embodiment. It is a graph shown.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 outer ring (track member) 2 inner ring (track member) 3 ball (rolling element) 4 cage 11 coating 21 coating

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (reference) A01N 59/16 A01N 59/16 A C08K 3/00 C08K 3/00 5/00 5/00 7/02 7 / 02 C08L 101/00 C08L 101/00 C23C 30/00 C23C 30/00 A C F16C 29/04 F16C 29/04 33/34 33/34 33/44 33/44 33/56 33/56 33/62 33 / 62 F16H 25/24 F16H 25/24 AB (72) Inventor Toshiro Takagi 1-5-50 Kugenuma Shinmei, Fujisawa-shi, Kanagawa Japan Seiko Co., Ltd. F-term (reference) 3J101 BA10 BA50 BA53 BA70 EA06 EA31 EA51 EA76 EA78 FA60 GA60 3J104 AA01 CA03 CA13 CA31 DA20 EA10 4H011 AA02 BA01 BB02 BB18 BC04 BC18 BC19 DA07 DA10 DD07 DH02 DH03 DH08 4J002 BB021 BB031 BD121 BD141 BD151 BD161 CB001 CF162 CH091 CL001 CL1 DA067 DA01 DA01 DA0176 E148 DE188 DE227 DE237 DF018 DH046 DJ008 DK008 DL008 EC077 EF096 EG027 EG037 EJ077 EN027 EN077 EN107 ER027 EU047 EU237 EV326 FA068 FD012 FD018 FD186 FD187 GM05 4K044 AA02 AB05 AB10 BA08 BA20 BC21 BC01 BC00

Claims (4)

[Claims] 1. A vehicle comprising at least a rolling element interposed between a fixed body and a moving body, and a track member having a track of the rolling element and fixed to the fixed body side and the moving body side as components. In a rolling support device that allows a moving body to move relative to a fixed body by rolling elements rolling on a track, the surface of a component is covered with a coating mainly containing iodine or an iodine compound. Rolling support device. 2. A vehicle, comprising at least a rolling element and a track member having a track of the rolling element and fixed to the fixed body side and the moving body side, which are interposed between the fixed body and the moving body, In a rolling support device that allows the moving body to move with respect to the fixed body by the rolling body rolling on the track, the track member whose outer peripheral surface is a rolling surface for another member is made of a thermoplastic resin containing an antibacterial agent. A rolling support device, characterized in that: 3. A rolling bearing, wherein the cage is made of a resin composition containing fibers containing an antibacterial agent. 4. A rolling element, which is interposed between a fixed body and a moving body, and includes at least a track member having a track of the rolling body and fixed to the fixed body side and the moving body side, In a rolling support device that allows the moving body to move with respect to the fixed body by the rolling body rolling on the track, the raceway member whose outer peripheral surface is a rolling surface for another member is a resin composition containing a fiber containing an antimicrobial agent. A rolling support device, comprising a material.