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Grease filled bearing

A grease seal and bearing technology, applied in the direction of bearings, roller bearings, shafts and bearings, etc., can solve the problems of difficult to completely suppress poor lubrication, damage to the raceway ring, rust, etc., achieve excellent durability, and inhibit bearing damage. , the effect of reducing consumption

Inactive Publication Date: 2015-10-28
NSK LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there is a problem that in the continuous grease supply method, when the grease is supplied, water and scale may be mixed from the outside, so it is difficult to completely suppress the occurrence of poor lubrication. Rotates under high load conditions, thus causing excessive wear and, in some cases, damage to the raceway rings
In addition, during the roller maintenance period, the bearings stored off-line will be rusted due to the influence of water, and when the operation is restarted after the maintenance, the raceway ring may be damaged starting from the rust

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～24、 comparative example 1～2

[0071] Test greases having the compositions shown in Table 1 were prepared. At this time, in Examples 1 to 7 and 17 to 20, grease compositions using an aromatic diurea compound (tA) as a thickener and grease compositions using an aliphatic diurea compound (tB) as a thickener were prepared, respectively. Grease composition, and mix the two grease compositions to prepare test grease. In addition, the mixing ratio of the aromatic diurea compound (tA) and the aliphatic diurea compound (tB) is shown in Table 1. In the thickener tA, TDI was used as the isocyanate, p-toluidine was used as the monoamine, and in the thickener tB, MDI was used as the isocyanate, and octylamine was used as the monoamine.

[0072] In addition, in Examples 10-16, 21-24, the aromatic amine compound and the aliphatic amine compound were simultaneously reacted in the base oil, and the test grease which used the reaction product (tC) as a thickener was prepared. In addition, in Examples 11 to 16, 40% by mass o...

Embodiment 3

[0096] The types of thickeners in Examples 3, 4, 22, and 23 are the same, but due to differences in preparation methods, the composition and structure of thickener fibers are different. For Example 3 and Example 4, which were mixed after synthesizing aliphatic diurea and aromatic diurea respectively, compared with Example 22 and Example 23, which synthesized and mixed three kinds of diurea at the same time, the oil film was thicker, Excellent performance, good wear resistance.

[0097] From Examples 1-9 and Examples 12-17, it turns out that wear resistance improves by containing an aromatic diurea compound at 40 mass % or more.

[0098] From Examples 1 to 5, it can be seen that the weight ratio of the aromatic diurea compound to the aliphatic diurea compound is 40:60 to 95:5, and the apparent viscosity is below 0.6 Pa·s, thereby further improving the wear resistance .

[0099] From Examples 3 to 5, it can be seen that the weight ratio of the aromatic diurea compound to the a...

Embodiment 25 to 27

[0102] The test grease of Example 4 was used, and the rust preventive agent and antioxidant shown in the rust preventive treatment A or rust preventive treatment B shown below were added. Then, the following (5) rust resistance test was performed to evaluate the rust resistance. The results are shown in Table 2. In addition, the addition amount is the ratio to the total amount of test grease.

[0103] Antirust treatment A: 1.0% by mass of sorbitan trioleate (HLB=1.8), 1.0% by mass of succinic anhydride, 1.0% by mass of calcium dinonyl naphthalenesulfonate, 1.0% by mass of alkenyl succinic imide

[0104] Antirust treatment B: 1.0% by mass of sorbitan trioleate (HLB=1.8), 1.0% by mass of calcium dinonylnaphthalenesulfonate

[0105] ・Antioxidant: 1.0% by mass of alkylated diphenylamine

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Abstract

A grease-filled bearing filled with a grease composition containing a thickener which is a diurea compound represented by R 1 -NHCONH-R 2 -NHCONH-R 3 or a mixture thereof and a base oil containing alkyl diphenyl ether oil and containing poly ±-olefin oil as an optional component at a mass ratio of 40:60 to 100:0 (alkyl diphenyl ether oil:poly ±-olefin oil). In general formula (1), at least one of R 1 and R 3 is a C 6-12 aromatic hydrocarbon group and the other is a C 6-12 aromatic hydrocarbon group or a C 6-20 aliphatic hydrocarbon group. R 2 is a C 6-15 aromatic hydrocarbon group.

Description

technical field [0001] The present invention relates to grease-enclosed and sealed bearings, roller support devices for continuous casting processes, pallet chassis, table rollers, squeeze rollers, conveyors, etc. for iron and steel equipment, construction machinery, mining machinery, etc. the bearings used. Background technique [0002] Rolling bearings (generally roller bearings) used in continuous casting processes such as iron and steel equipment, construction machinery, and mining machinery, etc. Low speed, high load, high temperature, cooling water, and scale are applied from the outside, so it is used under very severe conditions where it is difficult to form an oil film. Rolling bearings used under such severe conditions use high-viscosity base oil to ensure the thickness of the oil film, and continuously supply grease with improved fluidity into the bearing with high viscosity, so that new-product grease can always be supplied to the contact surface , Inhibit the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C33/66C10M115/08C10M169/02F16C19/28F16C23/08F16C33/78C10N20/00C10N20/02C10N30/06C10N50/10
CPCC10M169/02C10M115/08C10M2205/0285C10M2207/0406C10M2207/289C10M2215/102C10M2215/1026C10M2215/28C10M2219/044C10N2210/02C10N2220/022C10N2230/02C10N2230/06C10N2230/12C10N2230/76C10N2240/02C10N2250/10F16C19/28F16C23/08F16C23/086F16C33/66F16C33/6607F16C33/6633F16C33/78F16C33/7806F16C33/7853C10M2207/123C10M2215/064C10N2010/04C10N2020/02C10N2030/02C10N2030/06C10N2030/12C10N2040/02C10N2050/10F16C19/38
Inventor 神田晴香稻见宣行外尾道太横内敦今野胜广
Owner NSK LTD
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