JP3500734B2 - Ball bearings coated with anti-rust lubricant - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is particularly effective in preventing the formation of rust.
The ball has excellent characteristics such as torque, sound and life.
Regarding bearings.

[0002]

2. Description of the Related Art The conventional rust preventive lubricating oil is focused on lubricity.
Because it is a mineral oil, rust inhibitor and antioxidant
Is used, and the viscosity is 120-50.
0 mm ² ・ S^-1It is generally about / 40 ° C. This
The type of anti-corrosion lubricant used depends on the intended use.
However, in the normal case, apply it to rolled steel plate, etc.
Used as an intermediate rust preventive oil until the next process, or
For lubrication and lubrication, use it by lubricating the internal combustion engine etc.
Often.

[0003]

Such conventional rust preventive lubricating oil has a satisfactory rust preventive effect when applied to a rolled steel plate, an internal combustion engine or the like. However, even if a very small amount of rust is generated, the bearing performance will be greatly affected. If a conventional rust preventive lubricant is used for a small bearing such as a sealed ball bearing, a sufficient rust preventive effect cannot be obtained. There was a problem.

Of course, in order to enhance the rust preventive effect, a sulfonate which is a rust preventive may be added. However, increasing the addition amount adversely affects various characteristics such as bearing torque, sound, life, and compatibility with grease filled in the bearing.Therefore, the sulfonate content should be considered in consideration of bearing characteristics. Must be decided. Also, in sealed ball bearings, the lubrication mode is not uniform due to the difference in the grease filling form.For example, the initial lubrication depends on the rust preventive lubricating oil applied to the outer ring raceway and the inner ring raceway without using the filled grease. There is a case. In such a case, there has been a problem that the above-mentioned conventional mineral oil-based rust preventive lubricating oil cannot sufficiently fulfill its function.

Therefore, the present invention is based on the conventional ball as described above.
Which has been made to solve the problems of the bearing, rust onset
Life is prevented and various characteristics such as torque, sound, life etc.
Aims to provide an excellent ball bearing.

[0006]

[Means for Solving the Problems] Claim 1 according to the present invention
Ball bearings coated with anti-rust lubricant are
Between the inner ring and the outer ring
And a retainer for holding the ball.
In a sealed ball bearing filled with grease, oil
From the group consisting of sulfonates and synthetic sulfonates of the system
2 to 20 weight of at least one selected sulfonate
% Containing as rust inhibitors, viscosity 10 to 100 mm ² ·
More than 20% by weight of S- ¹ / 40 ° C ether oil as base oil
Rust-preventing lubricating oil that contains and prevents the cage noise from increasing
Applied to the outer ring, the inner ring, the balls, and the cage.
It is characterized by being clothed.

A rust preventive lubricating oil according to claim 2 of the present invention
The ball bearing coated with is coated with the rust preventive lubricating oil according to claim 1.
In the case of cloth ball bearings, the
The film thickness of anti-rust lubricating oil is 0.1 ~ 20μm,
The amount of the above-mentioned rust preventive lubricating oil adhered should be 2-3 mg.
And are characterized. The rust preventive lubricating oil may further contain additives such as an oiliness improver, an alcohol solvent and an antioxidant.

In the present invention, the content of each component is expressed as the content of "whole rust preventive lubricating oil" unless otherwise specified.

[0009]

When the anticorrosive lubricating oil of the present invention is used for a bearing such as a sealed ball bearing, it exhibits a good rust preventive action without deteriorating various characteristics such as torque, sound and life of the bearing. For example, when operating with sealed ball bearings filled with sodium grease, the water absorption of the grease causes the grease to harden early or over time and the fluidity deteriorates, resulting in a loud bearing cage noise. Sound performance may be adversely affected. As a countermeasure, by applying the anticorrosive lubricant of the present invention to the inner ring raceway, the outer ring raceway, the cage and the ball of the sealed ball bearing in advance, the above-mentioned phenomenon that the cage noise after the bearing is operated is increased. Can be prevented.

Further, the ball bearing coated with the rust preventive lubricating oil of the present invention has excellent performance such as durability performance, cage sound after durability test, compatibility with grease, rotation torque, initial cage sound, and rust preventive property. Is obtained. Hereinafter, the rust preventive lubricating oil of the present invention will be described in more detail. As the anticorrosive agent used in the present invention, a synthetic or petroleum sulfonate having a good anticorrosive property is preferable. As the synthetic sulfonic acid, for example, dinonylnaphthalene sulfonic acid and heavy alkylbenzene sulfonic acid are used. Further, as the petroleum sulfonic acid, a sulfonate of an aromatic hydrocarbon component in the lubricating oil fraction is used. Usually, these molecular weights are 500
The thing of a grade is used suitably. Those selected from calcium sulfonate in which the metal element contained is calcium, barium sulfonate in which the metal element contained is barium, or a mixture thereof are particularly preferable.

The content of the rust preventive agent in the rust preventive lubricating oil of the present invention in the whole rust preventive lubricating oil is 2 to 20% by weight. If the content of the rust preventive agent is less than 2% by weight, the anticorrosive action is lowered, and if it exceeds 20% by weight, the rust preventive agent is mixed in a large amount with the grease filled in the ball bearing. To soften the grease, which in turn reduces the life of the grease.

The ether oil contained in the base oil used in the present invention is a "phenyl ether type synthetic lubricating oil (phnyleth).
eric type synthetic lubricating oil) "and contains alkyl diphenyl ether and / or polyphenyl ether. As the ether oil, alkyl diphenyl ether is preferable from the viewpoints of reducing the cage sound of the bearing and improving the durability. As the alkyl diphenyl ether, there is, for example, a product of MORESCO-HILUBE (trade name), Matsumura Oil Research Institute Co., Ltd.

When the ether oil is an alkyl diphenyl ether, it is preferable to use calcium sulfonate in combination as an anticorrosive agent. The alkyl diphenyl ethers themselves and the polyphenyl ethers themselves can be used as ether oils. As a base oil,
The ether oil itself can be used alone.

Further, as the base oil, at least 1 selected from the group consisting of ether oil and mineral oil, synthetic oil and ester oil.
A mixture with a seed oil (hereinafter sometimes referred to as an ether oil-containing mixture) can also be used. As mineral oil,
Various mineral oils can be used. As a synthetic oil,
For example, poly-α-olefins, ethylene-α-olefin oligomers and aromatic synthetic hydrocarbon oils are preferably used.

As the ether oil, for example, diester oil, hindered ester oil and complex ester oil are preferably used. By using such an ether oil-containing mixture as the base oil, compared to the case where the ether oil itself is used alone as the base oil without impairing the bearing acoustic performance (retainer sound reduction) and durability performance. Can be low cost.

The ether oil content of the ether oil-containing mixture used as the base oil is preferably 20% by weight or more. If the content is less than 20% by weight, it tends to be difficult to secure the bearing acoustic performance. In the anticorrosive lubricating oil of the present invention, the viscosity of the ether oil itself and the ether oil-containing mixture used as a base oil is usually 10 to 10.
It is set to 0 mm ² · S ^-1 / 40 ° C. Viscosity is 10 mm ^2.
If a ball bearing with a temperature below S ^-1 / 40 ° C is used,
The durability of bearings cannot be expected to increase. On the other hand, the viscosity is 10
If the temperature exceeds ⁰ mm ² · S ^-1 / 40 ° C, the effect of preventing the cage noise is insufficient.

The rust preventive lubricating oil of the present invention may contain an oiliness improver together with the rust preventive agent and the base oil. By including the oiliness improver, the lubricating performance such as abrasion resistance can be further improved. Examples of the oiliness improver in the rust preventive lubricating oil of the present invention include higher alcohols, carboxylic acids such as oleic acid, amines such as stearylamine, and organic molybdenum compounds such as molybdenum dithiophosphate, and the like, Phosphate esters such as tricresyl phosphate, phosphorus and sulfur additives, or mixtures thereof such as, for example, a mixture of oleic acid and tricresyl phosphate are used. A phosphorus-based oiliness improver which is excellent in durability is preferable, and a phosphoric acid ester is particularly preferable.

The content of the oiliness improver in the entire rust preventive lubricating oil of the present invention is preferably 1 to 10% by weight. If this content is less than 1% by weight, a great improvement in lubricating performance cannot be expected. If this content exceeds 10% by weight, there is a great risk that the excess oiliness improver will be mixed in a large amount into the grease filled in the bearing to deteriorate or soften the grease, and the bearing lubricating performance will be extremely lowered. .

Further, the rust preventive lubricating oil of the present invention may further contain other additives such as an alcohol solvent and an antioxidant. Anti-rust lubricating oil of the invention, bearing balls held in the cage between the outer ring raceway and the inner ring of the inner ring raceway of the outer ring is disposed, in particular rust lubrication of small bearings such as sealed ball bearings It is preferably used as an oil.

Rust-preventing lubricating oil is applied to the entire surface of the outer ring, the entire surface of the inner ring arranged inside the outer ring, the balls arranged between the outer ring and the inner ring, and the cage holding the balls. To be done. When used as a bearing lubricant, it is applied to the surface of the bearing, for example.

[0021]

EXAMPLES The present invention will be specifically described below with reference to Examples and Comparative Examples. (A) Preparation of sample: At least one of calcium sulfonate and barium sulfonate as a rust inhibitor was added to a base oil containing alkyldiphenyl ether in a predetermined amount within a range of 2 to 20% by weight with respect to the entire rust-preventive lubricating oil, The samples of Examples 1 to 16 shown in Table 1 and Table 2 were prepared. An oiliness improver was further added to the samples of Examples 11 to 16. Alcohol-based solvents (Sample 1
8 for butyl cellosolve, samples 9-16 for 3-methyl-3methoxybutanol) and antioxidant DBPC
(2,6-di-tert-butyl-p-cresol) was added.

[0022]

[Table 1]

[0023]

[Table 2]

On the other hand, the samples shown in Tables 3 and 4 were prepared as comparative examples. As the base oil, alkyl diphenyl ether as ester oil, ester oil, mineral oil, PAO (poly-α-
Olefin). Further, in Comparative Example 1, no rust inhibitor was added. In Comparative Examples 2 to 12, at least one of calcium sulfonate and barium sulfonate was added as a rust inhibitor, and in Comparative Example 13, Na sulfonate was added.
The content rate is as shown in the table. An oiliness improver was added to the samples of Comparative Examples 3-5. The same alcohol-based solvent and antioxidant as in Examples 9 to 16 were added to all the samples.

[0025]

[Table 3]

[0026]

[Table 4]

In each table, the content in [] is the content in the entire rust-preventing lubricating oil, and the viscosity in () in each table is the value at 40 ° C. The rust preventive lubricating oils of the above Examples and Comparative Examples were applied to the following bearings to prepare test samples. Type of bearing used: Single row deep groove ball bearing, non-contact rubber seal type (V type), nominal number 695, dimensions: inner diameter 5 mm x outer diameter 13 mm x width 4 mm.

Method and amount of anti-corrosion lubricant applied to the bearing: The bearing is immersed in anti-corrosion lubricant, then pulled up and air is blown off to remove excess anti-corrosion lubricant. Furthermore, the rust preventive lubricating oil remaining on the bearing was removed by centrifugal force. As a result, the film thickness of the rust-preventive lubricating oil adhered to the outer surface of the bearing is 0.1 to 20 μm, and the adhered amount inside the bearing is 2-3
Adjusted to mg. (B) Test content: Various characteristic tests of the following items were performed. (1) Bearing durability test Bearing speed: 3600 rpm Load: 19.6N Encapsulated grease: Sodium grease (encapsulated amount: 16 m
g) Evaluation criteria are as follows.

○: 10000 hours or more △: 2000 to 3000 hours ×: 1000 hours or less (2) Cage noise measurement test Bearing rotational speed: 1800 to 3600 rpm Load: 19.6N Encapsulated grease: Sodium grease (encapsulated amount: 16 m
g) Evaluation criteria are as follows.

○: No cage noise Δ: Cage sometimes occurs ×: Cage noise (3) Compatibility test with grease (measuring grease leakage amount after bearing rotation) Bearing rotation speed: 3600 rpm Load: 19.6N Encapsulated grease: Sodium-based grease, lithium-based grease, urea-based grease (encapsulated amount: 16 mg) Atmosphere: 60 ° C x 70% relative humidity Leaving time: 7 days Evaluation criteria are as follows.

○: No grease leakage △: Grease leakage is small ×: Grease leakage is large (4) Rotation torque measurement test Bearing rotation speed: 3600 rpm Load: 19.6N Encapsulated grease: Sodium grease, lithium grease (encapsulation) Amount: 16 mg) The evaluation criteria are as follows.

◯: 1 to 4 × 10 ⁻² N · m Δ: 5 to 10 × 10 ⁻² N · m ×: 11 × 10 ⁻² N · m or more (5) Rustproof test shaft bearing: Part number Inner ring and outer ring atmosphere of 695: 20 ° C x 90% relative humidity (3 hours) and 50 ° C x 90% relative humidity (3 hours) cycle of alternating cycle: 7 days Evaluation criteria are as follows: On the street.

◯: No rust Δ: Several points of rust ×: Many rusts The results of the above characteristic test are shown in Tables 1, 2, 3 and 4, respectively. From Tables 1, 2, 3 and 4, the following has been clarified. (A) Satisfactory results were obtained in all characteristic test items using the rust-preventive lubricating oil of the examples. Ie durability,
It exhibits excellent performance that satisfies the items of cage noise, compatibility with grease, rotation torque, and rust prevention. (B) Examples 1 to 1 in which the composition of the base oil consists only of ether oil
The rust-preventing lubricating oil of Example 4 and the rust-preventing lubricating oil of Examples 5 to 16 made of a mixture of 20% by weight or more of ether oil and other oils such as mineral oil, PAO and ester oil all have all properties. The test items show satisfactory results and there is no difference in performance. On the other hand, the rust preventive lubrication of Comparative Examples 5 to 8 in which the base oil is a mineral oil or an ester oil alone and Comparative Examples 9 to 11 and a mixture of less than 20% by weight of ether oil and other oils such as mineral oil, PAO and ester oil. For both oils, cage noise was generated at the initial stage and after the endurance test.

From this result, by using a mixture containing 20% by weight or more of ether oil in the base oil,
It has been found that a rust preventive lubricating oil can be provided which has a lower cost than that of only ether oil and has practically sufficient performance. (C) A large amount of rust was observed in Comparative Example 1 in which the content of the rust inhibitor was less than 2% by weight, and Comparative Examples 2 and 4 in which the content of rust inhibitor was more than 20% by weight were cages after durability and durability tests. sound,
Not compatible with grease. (D) Comparative Example 3 in which 10% by weight or more of the oiliness improver was added
Is inferior to Examples 11 and 12 in which the same oiliness improver is added in the range of 1 to 10% by weight, durability, compatibility with cage sound after durability test, and grease. (E) The rust-preventive lubricating oils of Examples in which the viscosity of the base oil is in the range of 10 to 100 mm ² · S ⁻¹ are excellent in durability and no cage noise is generated, while the base oil viscosity is in the above range The outer comparative examples 11 and 12 are unsatisfactory in terms of durability or the sound of the cage at the initial stage and after the durability test.

The rust preventive lubricating oil of the present invention is not limited to those of the examples, and the same effect can be obtained by using the above-mentioned base oil.

[0036]

The ball bearing coated with the anticorrosive lubricating oil of the present invention
Prevents rust from occurring, and also improves torque, sound and life.
Etc. are excellent.

Continuation of front page (51) Int.Cl. ⁷ Identification code FI C10N 20:02 C10N 30:12 30:12 40:02 40:02 (72) Inventor Akira Suzuki 1165 Nakamaruko, Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture (165) Inventor Shigeki Maehara 5-29-11 Shimosueyoshi, Tsurumi-ku, Yokohama-shi, Kanagawa (56) Reference JP-A-3-200898 (JP, A) JP-A-5-98280 (JP, A) JP-A-2-270975 (JP, A) JP-A-5-263091 (JP, A) JP-A-61-287986 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16C 33/66 C10M 105 / 18 C10M 135/10 C10M 169/04 C10N 20:02 C10N 30:12 C10N 40:02

Claims (2)

(57) [Claims] 1. An outer ring and an inner ring disposed inside the outer ring.
A ball disposed between the outer ring and the inner ring,
With a cage that holds balls,
Group of petroleum-based sulfonates and synthetic sulfonates in enclosed sealed ball bearings
2 to 20 of at least one sulfonate selected from
Contains as a weight% rust inhibitor, viscosity 10-100mm
20% by weight or more of base oil of ² · S ^-1 / 40 ° C ether oil
Corrosion-preventive lubrication to prevent the cage noise from increasing
Oil is applied to the outer ring, the inner ring, the balls, and the cage.
Ball coated with anti-corrosion lubricant characterized by being coated
bearing. 2. The rust preventive lubrication adhered to the outer surface of a bearing.
The oil film has a thickness of 0.1 to 20 μm and adheres to the inside of the bearing.
The amount of the above-mentioned rust preventive lubricating oil is 2-3 mg
A ball bearing coated with the rust preventive lubricating oil according to claim 1.