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Grease composition for automobile wheel bearing

a technology for automobile wheels and grease compositions, applied in the petroleum industry, lubricant compositions, additives, etc., can solve problems such as flaking, unsatisfactory grease compositions, and phenomenon called fretting, and achieve the effect of reducing fretting wear and prolonging the flaking life of wheel bearings

Inactive Publication Date: 2007-07-05
NTN CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013] The grease of the present invention can significantly extend the flaking life of the wheel bearings in the automobiles and the lubrication life, and reduce the fretting wear. In particular, the grease of the present invention can extend the useful life of cars to 10 years and guarantee 1,200,000 kilometers of driving, for example, by preventing the galling at the end of the rollers in the tapered roller bearings.

Problems solved by technology

This may often cause the problem of flaking as a result of metal fatigue.
However, satisfactory grease compositions have not yet been obtained.
Further, while the vehicle carries a freight car, the bearings are subject to slight vibration and the like and eventually worn out to cause a phenomenon called fretting in some cases.
However, there is no grease composition that can meet such requirements satisfactorily.
The grease composition will deteriorate due to oxidation and cannot exhibit its desired performance as the period of service of a car is prolonged or the mileage is accumulated.
In the tapered roller bearings, when oil in the form of a layer runs out around the periphery of the rollers, the end portions of the rollers may be damaged while sliding.

Method used

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  • Grease composition for automobile wheel bearing
  • Grease composition for automobile wheel bearing
  • Grease composition for automobile wheel bearing

Examples

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example 1

[0034] The present invention will now be explained with reference to the following Examples and Comparative Examples.

[0035] Grease compositions according to Examples 1 to 4 and Comparative Examples 1 and 2 were independently prepared in such a manner that a thickener and an organic molybdenum compound were added to a base oil as shown in Table 1, and the resultant mixture was kneaded using a three-roll mill. The numerical values in Table 1 indicate the contents (%) in the composition. Examples 1 to 4 and Comparative Example 2 employed an aromatic urea compound represented by the previously mentioned formula (1-1) as the thickener. In each composition, an antioxidant and a rust preventive were incorporated as auxiliary components in amounts of 3% by mass and 2% by mass, respectively. The consistency of each grease composition was measured in accordance with JIS K2220. All the grease compositions were adjusted to have a consistency of 300.

TABLE 1Comp.Comp.Ex. 1Ex. 2Ex. 3Ex. 4Ex. 1E...

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Abstract

The present invention provides a grease composition for automobile wheel bearings, which contains (a) an urea thickener represented by general formula (1): R1—NHCONH—R2—NHCONH—R3 (wherein R1 and R3 may be the same or different from each other and are each independently an aromatic hydrocarbon group having 6 to 12 carbon atoms, and R2 represents an aromatic hydrocarbon group having 6 to 15 carbon atoms); (b) an organic molybdenum compound; and (c) a base oil. The composition of the present invention can extend the flaking life and lubrication life, and reduce the fretting wear.

Description

TECHNICAL FIELD [0001] The present invention relates to a grease composition used for automobile wheel bearings. BACKGROUND ART [0002] With respect to the automobile wheel bearings, the bearings support the vehicle's weight through the tires, and at the same time, they are operated under comparatively heavy load conditions with the application of radial, thrust and moment loads as well as impact loads from the contact point of the tires with ground depending upon the running conditions of the vehicle (non-patent document 1). This may often cause the problem of flaking as a result of metal fatigue. To extend the flaking life (i.e., fatigue life of the bearing material), a layer of lubricating oil is thickened (namely, by increasing the viscosity of the oil). However, satisfactory grease compositions have not yet been obtained. [0003] Further, while the vehicle carries a freight car, the bearings are subject to slight vibration and the like and eventually worn out to cause a phenomeno...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10M135/18C10M173/02
CPCC10M169/00C10M169/06C10M2203/1006C10M2205/0285C10M2215/1026C10M2219/068C10N2210/06C10N2250/10C10N2230/06C10N2230/10C10N2240/02C10N2010/12C10N2030/10C10N2030/06C10N2040/02C10N2050/10
Inventor KUBOTA, KAZUNORIOISHI, MAKOTO
Owner NTN CORP
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