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Grease composition for hub unit bearing, and hub unit bearing for vehicles

A technology of grease composition and hub unit, applied in the directions of lubricating composition, bearing element, wheel hub, etc., can solve the problem of reduced shear stability, and achieve the effect of excellent water resistance and corrosion resistance, and good lubrication

Inactive Publication Date: 2008-01-16
NSK LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In addition, when moisture is mixed into the grease, its shear stability decreases, and the grease will flow out from the lubricated part

Method used

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  • Grease composition for hub unit bearing, and hub unit bearing for vehicles
  • Grease composition for hub unit bearing, and hub unit bearing for vehicles
  • Grease composition for hub unit bearing, and hub unit bearing for vehicles

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0092]

[0093] The grease composition of the present invention contains an anti-stripping agent, a base oil and a thickener.

[0094] The anti-peeling agent is preferably a passivating agent, which is a compound that forms a passive film on at least one of the inner raceways 20a, 20b and the outer raceways 21a, 21b formed of various steels that also contain other metal elements. The passivation film is not only an oxide film generally formed as a passivation film, but also is widely formed as a strong film by covalent bonding between the metal constituting the orbital surface and the compound caused by the passivating agent. As the passivating agent, for example, inorganic corrosion inhibitors such as nitrite, nitrate, chromate, phosphate, molybdate, and tungstate, and metal passivating agents such as benzotriazole can be used. These passivators improve peel resistance by forming a passive film on the metal surface. At the same time, since the passive film inhibits the con...

no. 2 Embodiment approach

[0104]

[0105] [base oil]

[0106] The base oil used is composed of at least one of mineral oil and synthetic oil-based lubricating oil. As the above-mentioned mineral oil-based lubricating oil, mineral oil obtained by refining mineral oil by appropriately combining vacuum distillation, oil deasphalting, solvent extraction, hydrolysis, solvent dewaxing, sulfuric acid washing, clay refining, hydrofining, etc. can be used. The aforementioned synthetic oil-based lubricating base oils include, for example, hydrocarbon-based oils, aromatic-based oils, ester-based oils, ether-based oils, and the like.

[0107] The aforementioned hydrocarbon oils include, for example, polyα-olefins such as n-paraffins, isoparaffins, polybutenes, polyisobutenes, 1-decene oligomers, 1-decene and ethylene oligomers, or their hydrogenated products. Wait.

[0108] Examples of the aromatic oil include alkylbenzenes such as monoalkylbenzenes and dialkylbenzenes, and alkylnaphthalenes such as monoalkyln...

no. 3 Embodiment approach

[0127]

[0128] [base oil]

[0129] The base oil used is composed of at least one of mineral oil and synthetic oil-based lubricating oil. As the above-mentioned mineral oil-based lubricating oil, mineral oil obtained by refining mineral oil by appropriately combining vacuum distillation, oil deasphalting, solvent extraction, hydrolysis, solvent dewaxing, sulfuric acid washing, clay refining, hydrofining, etc. can be used. The aforementioned synthetic oil-based lubricating base oils include, for example, hydrocarbon-based oils, aromatic-based oils, ester-based oils, ether-based oils, and the like.

[0130] The aforementioned hydrocarbon oils include, for example, polyα-olefins such as n-paraffins, isoparaffins, polybutenes, polyisobutenes, 1-decene oligomers, 1-decene and ethylene oligomers, or their hydrogenated products. Wait.

[0131] Examples of the aromatic oil include alkylbenzenes such as monoalkylbenzenes and dialkylbenzenes, and alkylnaphthalenes such as monoalkyln...

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Abstract

This invention provides a grease composition that, even when water has entered, can maintain a good lubrication state for a long period of time and can suppress white texture separation and corrosion. There is also provided a hub unit bearing for vehicles that, even when used in such an environment that water enters, is less likely to cause white texture separation and corrosion and can realize a prolonged service life. A rolling bearing is also provided in which a grease composition characterized by adding an additive having a water-resistant film forming property has been sealed. The grease composition for hub unit bearing is characterized by comprising a base oil composed mainly of at least one oil selected from mineral oils and synthetic oils, a thickening agent, and a separation preventive agent. The hub unit bearing for vehicles comprises the above grease composition sealed therein.

Description

technical field [0001] The present invention relates to a lubricating grease composition and a wheel hub unit bearing for a vehicle. The lubricating grease composition has excellent peeling resistance and can maintain good lubrication for a long period of time. Background technique [0002] At present, as bearings for vehicles such as automobiles and trains, so-called hub unit bearings of a sealed type with a seal are generally used in many cases. These wheel hub unit bearings for vehicles are usually used outdoors while being exposed to water and dust. In addition, it is sometimes used in a state of being submerged in muddy water or the like. The hub unit bearings for vehicles used in such an environment can suppress the intrusion of water, dust, etc. from the outside by sealing with the sealing device, but it is difficult to completely prevent the intrusion of water. Therefore, the grease composition sealed in the vehicle hub unit bearing is in contact with water, and it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M171/00C10M129/26C10M129/40C10M133/08C10M133/10C10M133/16C10M149/14C10M169/00F16C19/18F16C33/66B60B35/02C10M101/02C10M115/08C10M117/02C10M133/38C10M135/18C10M159/24C10N30/00C10N30/12C10N40/02C10N50/10
CPCC10M2207/127C10N2230/26C10N2210/05C10N2230/12C10M2215/04C10M2215/1026C10M2207/1285C10M2215/042C10M2215/223B60B27/0094C10M2207/126C10M2219/068C10M2215/064B60B27/0005C10M2207/289C10M2203/1006C10N2250/10C10M169/00C10N2210/02C10M2215/02C10N2210/01C10M2219/044C10M2207/1276C10M169/06C10M169/04C10M2207/06F16C33/6633C10N2240/02C10M2205/0285F16C33/6607F16C19/06F16C19/185F16C19/186F16C2326/02C10N2010/10C10N2010/02C10N2030/26C10N2010/04C10N2030/12C10N2040/02C10N2050/10
Inventor 中谷真也仓石淳松本兼明并木实相田亮远藤敏明
Owner NSK LTD
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