Grease composition and grease-sealed bearing

A lubricating grease composition and technology of lubricating grease, applied in lubricating compositions, ball bearings, bearing components, etc., can solve the problems of low viscosity lubricant effect and unclear improvement effect of high temperature durability, and achieve thickening Excellent, high temperature durability improvement, low viscosity effect

Inactive Publication Date: 2011-03-23
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, Patent Document 1 describes that when the lubricant contains an ionic liquid as a conductivity-imparting agent, static electricity does not accumulate in the rotating part, and stable and low torque loss can be realized even under conditions such as high-speed rotation. However, the effect of reducing the viscosity of the lubricant and improving the high-temperature durability by containing the ionic liquid is still unclear.
In addition, Patent Document 2 predicts that the viscosity of the lubricant can be reduced by using the ionic liquid, but the corrosion of the bearing steel by the ionic liquid is easy to progress, so it is impossible to further improve the high-temperature durability of the bearing using this lubricant.

Method used

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  • Grease composition and grease-sealed bearing
  • Grease composition and grease-sealed bearing
  • Grease composition and grease-sealed bearing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～ Embodiment 3

[0052] Using the compounding ratio shown in Table 1, a grease composition was prepared using a base oil, a thickener, and a corrosion inhibitor. The ionic liquid as the base oil has a cationic component of 1-octyl-3-methylimidazole 1-octyl-3-methylimidazole manufactured by Merck whose cation and anion components are bis-trifluoromethylsulfonyl-imide anion - Bis-trifluoromethylsulfonyl-imide (shown in Formula 5 below, represented by OMI-TFSI in Table 1). The grease composition obtained was used as the grease composition for testing, and the following high-temperature, high-speed grease life test was carried out to measure the high-temperature, high-speed grease life time. The results are recorded in Table 1 together.

[0053] [chemical 5]

[0054]

[0055]

[0056] Enclose 38% of the total space volume of the obtained test grease in the rolling bearing 6204 (inner diameter 20mm×outer diameter 47mm×thickness 14mm). °C, rotated at a rotation speed of 10000rpm, and the ...

Embodiment 4、 Embodiment 6～ Embodiment 10 and comparative example 7

[0058] Using the compounding ratio shown in Table 1, a grease composition was prepared using a base oil, a thickener, and a corrosion inhibitor. The ionic liquid as the base oil has a cationic component of 1-hexyl-3-methylimidazole 1-hexyl-3-methylimidazole manufactured by Merck whose cation and anion components are bis-trifluoromethylsulfonyl-imide anion - Bis-trifluoromethylsulfonyl-imide (shown in Formula 6 below, represented by HMI-TFSI in Table 1). The obtained grease composition was used as the test grease, and the above-mentioned high-temperature, high-speed grease life test was carried out to measure the high-temperature, high-speed grease life time. The results are recorded in Table 1 together.

[0059] [chemical 6]

[0060]

Embodiment 5

[0062] Using the compounding ratio shown in Table 1, a grease composition was prepared using a base oil, a thickener, and a corrosion inhibitor. The ionic liquid as the base oil has a cationic component of 1-hexyl-3-methylimidazole 1-hexyl-3-methylimidazole manufactured by Merck whose cation and anion components are trifluoro-tris(pentafluoroethyl)phosphide anion -Three(pentafluoroethyl)-trifluorophosphides (as shown in the following compound 7, HMI-(C 2 f 5 ) 3 PF 3 - express). The obtained grease composition was used as the test grease, and the above-mentioned high-temperature, high-speed grease life test was carried out to measure the high-temperature, high-speed grease life time. The results are recorded in Table 1 together.

[0063] [chemical 7]

[0064]

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PUM

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Abstract

A grease composition which can be improved in high -temperature durability while attaining friction reduction or viscosity reduction and a bearing sealed with this grease composition. The grease composition comprises a base oil, a thickening agent, and an additive. The base oil contains an ionic fluid composed of a cation component and an anion component; the additive contains a corrosion inhibitor such as nitrites, molybdates or dibasic acid salts; and the thickening agent is a fluororesin such as polytetrafluoroethylene resin. The grease-sealed bearing (1) is sealed with the grease composition (7) at least around a rolling element (4).

Description

technical field [0001] The present invention relates to a grease composition and a bearing filled with the grease, and more particularly to a grease composition containing an ionic liquid in a base oil and a bearing filled with the grease. Background technique [0002] As a lubricant for bearings, lubricating oil or grease is generally used. Examples of base oils containing these lubricating oils or greases as main components include synthetic oils such as mineral oils, poly-α-olefin oils, ester oils, silicone oils, and fluorine oils. In recent years, lubricating oils and greases used in bearings and the like have been required to improve their low friction and low viscosity from the viewpoint of energy saving. In addition, with regard to bearings used in electrical and electronic products of automobiles, along with the demand for miniaturization and high performance, the lubricants sealed in bearings are required to be improved in high temperature durability. [0003] As ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M169/00F16C19/06C10M105/50C10M105/70C10M105/72C10M105/74C10M119/22C10M125/10C10M129/42C10N20/02C10N30/06C10N30/08C10N40/02C10N50/10C09K23/34
CPCF16C33/6633C10N2230/06C10N2210/06C10M2201/083C10M2223/02C10M2215/2203C10N2240/02C10M115/08C10M2201/06C10N2250/10C10M2223/0603C10M115/12C10M2213/0613C10N2220/04C10M2207/10C10M2207/123C10N2230/02C10N2210/01C10M115/10C10M2219/0406C10M169/04C10N2010/12C10N2020/077C10N2010/02C10N2030/02C10N2030/06C10N2040/02C10N2050/10Y02T10/86
Inventor 川村隆之
Owner NTN CORP
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