JP2000120709A - Rolling bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling bearing which can ensure required rust preventive effect while it does not affect the attachment and the bonding of another component, and which can prevent occurrence of environmental contamination. SOLUTION: In a rolling bearing in which a plurality of rolling elements 5 are held between an inner and an outer races 2, 4, a surface 9 defining an inner diameter of the bearing and a surface 8 defining the outer diameter of the bearing are coated thereover with a rust preventive oil composed of mineral oil having a viscosity of 7 to 120 mm/s at a temperature of 40 deg.C, and lubrication oil of synthetic hydrocarbon group or fluorine group, which are blended each other, by 0.08 to 1.6 mg/cm2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a rolling bearing,
More specifically, the present invention relates to a rolling bearing in which the amount of rust preventive oil applied for rust prevention treatment is specified.

[0002]

2. Description of the Related Art As shown in FIG. 1, for example, as shown in FIG. 1, a rolling bearing incorporated in a rotating part of various devices and apparatuses includes an inner race 2 having an inner race 1 on an outer peripheral surface and an outer race 4 having an outer race 3 on an inner peripheral surface. Are concentrically arranged, a plurality of rolling elements (balls) 5 are rotatably held between the inner raceway 1 and the outer raceway 3 via a retainer 7 and fixed to both ends of the outer race 4. The grease (not shown) is sealed by the seals 6 and 6 and is configured roughly. The inner ring 2, outer ring 4, and rolling elements 5 of the rolling bearing are made of high carbon chromium steel (JIS G4805 or AISI 52100) generally called bearing steel.
Since they are easily rusted, a considerable amount of rust-preventive oil is applied to their surfaces during storage and shipping.

[0003]

Incidentally, in the rolling bearing, a new member may be attached to the inner ring 2 or the outer ring 4 depending on the use or purpose. For example, in a rolling bearing used for office equipment or the like, a resin roller or gear may be attached to the outer ring 4 by insert molding or press fitting. However, in this case, if the applied amount of the rust-preventive oil applied to the outer diameter surface 8 of the outer ring 4 is too large, the fixing force between the outer ring 4 and the rollers and gears is reduced, and both of them are in operation for a long time. Rollers and gears may fall off due to slippage between them. In a rolling bearing used for a precision small motor for a drum spindle of a VTR or the like, an inner ring 2 and a shaft (not shown), and an outer ring 4 and a housing (not shown) are often fixed with an adhesive. However, also in this case, if the amount of the rust preventive oil applied to the inner diameter surface 9 of the inner ring 2 and the outer diameter surface 8 of the outer ring 4 is too large, there is a problem that the adhesive does not solidify or the adhesive strength is reduced. Furthermore, if the amount of the rust-preventive oil applied is too large, there is a problem that the surrounding area is contaminated. For example, in a rolling bearing used in a copying machine, the rust-preventive oil scatters on other components and contaminates copy paper. Etc. may occur.

Therefore, in order to avoid such a problem,
Usually, extra rust preventive oil adhering to the rolling bearing is wiped off before the above mounting, but the wiping is insufficient or excessive, or moisture is mixed during wiping and rust is generated. And so on. The present invention has been made in view of such a situation, does not affect the attachment and adhesion of other members, and does not pollute the surrounding environment, while ensuring a necessary rust prevention effect. An object is to provide a rolling bearing.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rolling bearing having a plurality of rolling elements rotatably held between an inner ring and an outer ring. A rust-preventive oil obtained by blending a rust-preventive agent with a mineral oil-based, synthetic hydrocarbon-based, or fluorine-based lubricating oil having a viscosity of 7 to 120 mm / s at 40 ° C. on the surface constituting the outer diameter is 1c
This is achieved by a rolling bearing characterized in that 0.08 to 1.6 mg per m ^{2 is} deposited. The rolling bearing of the present invention uses a specific rust-preventive oil, and furthermore, by regulating the amount of the rust-preventive oil, while ensuring the necessary rust-preventive effect, without affecting the attachment and adhesion of other members, and It does not pollute the surrounding environment. Moreover, since the wiping operation is not required, there is no variation in the wiping, the mounting strength and the adhesive strength of other members are uniform, and no rust is generated due to the wiping.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The rolling bearing of the present invention will be described below in detail. The configuration of the rolling bearing of the present invention is not particularly limited, and examples thereof include the rolling bearing shown in FIG. In the present invention, the inner surface 2 of the inner ring 2 and the outer surface 8 of the outer ring 4
0.08 to 1.6 mg / cm ^{2 of} rust-preventive oil obtained by blending a rust-preventive agent with a mineral oil-based, synthetic hydrocarbon-based, or fluorine-based lubricating oil having a viscosity of 7 to 120 mm / s It is characterized by.

The mineral oil-based lubricating oil forming the rust-preventive oil of the present invention includes, for example, paraffinic and naphthenic mineral oils, which are distilled under reduced pressure, stripped of solvent, extracted with solvent, hydrocracked, and extracted with a solvent. Purified products obtained by appropriately combining dewaxing, washing with sulfuric acid, purifying clay, hydrorefining, and the like can be used.

[0008] Examples of the synthetic hydrocarbon-based lubricating oil include hydrocarbon-based oils, aromatic-based oils, ester-based oils, ether-based oils, and the like. Specifically, examples of the hydrocarbon oil include normal paraffin, isoparaffin, polybutene, polyisobutylene, 1-decene oligomer,
-Poly-α- such as co-oligomer of decene and ethylene
Examples include olefins and hydrides thereof.
Examples of the aromatic oil include alkylbenzene such as monoalkylbenzene, dialkylbenzene and polyalkylbenzene, and alkylnaphthalene such as monoalkylnaphthalene, dialkylnaphthalene and polyalkylnaphthalene. Examples of the ester oils include diesters such as dibutyl sebacate, di-2-ethylhexyl sebacate, dioctyl adipate, diisodecyl adipate, ditridecyl adipate, ditridecyl glutarate, and methyl acetyl ricinolate.
Alternatively, aromatic ester oils such as trioctyl trimellitate, tridecyl trimellitate, and tetraoctyl pyromellitate; further, trimethylolpropane caprylate, trimethylolpropaneperargonate, pentaerythritol-2-ethylhexanoate, and pentane Examples thereof include polyol esters such as erythritol belargonate, and complex esters which are oligoesters of a polyhydric alcohol and a mixed fatty acid of a dibasic acid / monobasic acid. Examples of the ether-based oil include polyglycols such as polyethylene glycol, polypropylene glycol, polyethylene glycol monoether, and polypropylene glycol monoether, or monoalkyl triphenyl ether, alkyl diphenyl ether, dialkyl diphenyl ether, pentaphenyl ether, tetraphenyl ether, monoalkyl And phenyl ethers such as tetraphenyl ether and dialkyltetraphenyl ether. Other synthetic lubricating base oils include tricresyl phosphate, silicone oil, perfluoroalkyl ether oil and the like.

As the fluorine-based lubricating oil, oils containing a fluorine atom such as perfluoroether oil, fluorosilicone oil, chlorotrifluoroethylene oil and fluorophosphazene oil can be used.

These lubricating oils must have a viscosity at 40 ° C. of 7 to 120 mm ² / s. If the viscosity is less than 7 mm ² / s, the amount of evaporation increases, and it becomes difficult to secure a rust-preventive oil film for long-term stock.
If it exceeds m ² / s, the thickness of the oil film will vary, and it will not be uniform over time, resulting in non-uniformity or a decrease in the bonding or bonding strength with other members. The particularly preferred viscosity is 10 to 50 m.
m ² / s.

The rust inhibitor is not particularly restricted but includes, for example, ammonium salts of organic sulfonic acids, alkali metal salts such as barium, zinc, calcium, and magnesium, and organic sulfonic acid salts, organic carboxylate salts and phenates of alkaline earth metals. Alkyl, alkenyl succinic acid derivatives such as phosphonate, alkyl or alkenyl succinic acid esters, partial esters of polyhydric alcohols such as sorbitan monooleate, hydroxy fatty acids such as oleoyl sarcosine, and mercapto fatty acids such as 1-mercaptostearic acid , Its metal salts, higher fatty acids such as stearic acid, higher alcohols such as isostearyl alcohol, esters of higher alcohols with higher fatty acids, 2,5
Thiazoles such as dimercapto-1,3,4-thiadiazole and 2-mercaptothiadiazole, imidazole compounds such as 2- (decyldithio) -benzimidazole and benzimidazole, or 2,5-bis (dodecyldithio) benzimidazole And the like, or phosphates such as trisnonylphenyl phosphite, thiocarboxylates such as dilauryl thiopropionate, and nitrite. Further, a metal deactivator composed of a triazole-based compound such as benzotriazole or tolyltriazole can also be used. Further, the concentration of the rust preventive in the rust preventive oil is preferably about 5% by weight.

The above rust-preventive oil is applied to the inner diameter surface 9 of the inner ring 2 and the outer diameter surface 8 of the outer ring 4 in an amount of 0.08 to 1.6 m / cm ² .
g. 0.08 mg / cm ^{2 of} rust preventive oil
If it is less than 1, the rust prevention effect is lost early. On the other hand, when the amount of the rust-preventive oil exceeds 1.6 mg / cm ² , the excess amount of the rust-preventive oil adversely affects the attachment and adhesion of other members and easily causes contamination of the surrounding environment as in the conventional case. . A particularly preferred adhesion amount is 0.5 to 0.8 mg / cm ^2.
It is. The method of adhering the rust-preventive oil is not particularly limited as long as the amount of the rust-preventive oil can be controlled, but the bearing is immersed in the rust-preventive oil, taken out, and then removed by centrifugal force or wind pressure. The method of removing and drying is simple.

[0013]

As described above, the rolling bearing of the present invention uses a specific rust-preventive oil and regulates the amount of the rust-preventive oil so that the required rust-preventive effect can be ensured while the other components are mounted. And does not affect adhesion and does not pollute the surrounding environment. Moreover, since the wiping operation is not required, there is no variation in the wiping, the mounting strength and the adhesive strength of other members are uniform, and no rust is generated due to the wiping.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an example of a rolling bearing of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 inner ring raceway 2 inner ring 3 outer ring raceway 4 outer ring 5 rolling element (ball) 6 seal 7 cage 8 outer diameter surface 9 inner diameter surface

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C10N 40:02 F term (Reference) 3J101 AA02 AA32 AA42 AA52 AA62 BA53 BA54 BA56 BA70 EA51 EA78 FA60 4H104 BA02A BA03A BA06A BB08A BB32A BB33A BB34A BB41A BB44A BD06A CB14A CD04A CJ13A DA02A EA02A EB10 LA06 PA01

Claims (1)

[Claims] In a rolling bearing having a plurality of rolling elements rotatably held between an inner ring and an outer ring, a viscosity at 40 ° C. is applied to a surface constituting a bearing inner diameter and a surface constituting a bearing outer diameter. A rust preventive oil obtained by mixing a rust preventive agent with a mineral oil-based, synthetic hydrocarbon-based, or fluorine-based lubricating oil of 7 to 120 mm / s is attached in an amount of 0.08 to 1.6 mg per 1 cm ^2. Rolling bearings.