The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 21, 2015
Filed:
Feb. 28, 2011
Osamu Saita, Fujisawa, JP;
Takashi Azuma, Fujisawa, JP;
Masamichi Yamamoto, Fujisawa, JP;
Kyodo Yushi Co., Ltd., Kanagawa, JP;
Abstract
The invention provides a grease composition for a hub unit bearing employing an angular contact ball bearing, containing (a) as a thickener a mixture of diurea compounds represented by formula (I): R—NHCONH—R—NHCONH—R, formula (II): R—NHCONH—R—NHCONH—R, and formula (III): R—NHCONH—R—NHCONH—Rwherein Ris cyclohexyl group, Ris a divalent aromatic hydrocarbon group having 6 to 15 carbon atoms, Ris a straight-chain or branched alkyl group having 12 to 20 carbon atoms, and (R/(R+R))×100=85 to 95 mol %; (b) a base oil; (c) a molybdenum dialkyldithiocarbamate; and (d) a calcium sulfonate. The grease composition of the invention, when used in the hub unit bearing, shows minimum leakage, excellent anti-flaking properties and satisfactory bearing lubrication life.