Kyodo Yushi Co., Ltd.

Ntn Corporation

Takashi Azuma

Masamichi Yamamoto

Motohiro Ito

Yasushi Shibata

Osamu Saita

Yoshihisa Imamoto

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&#x2014;NHCONH&#x2014;R&#x2014;NHCONH&#x2014;R, formula (II): R&#x2014;NHCONH&#x2014;R&#x2014;NHCONH&#x2014;R, and formula (III): R&#x2014;NHCONH&#x2014;R&#x2014;NHCONH&#x2014;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))&#xd7;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.

Grease composition for hub unit bearing employing an angular contact ball bearing and hub unit bearing

The invention provides a grease composition for hub unit bearing, containing (a) an aromatic diurea thickener, (b) a base oil, (c) a metal salt of oxidized wax, (d) diphenyl hydrogen phosphate, and (e) at least one rust preventive selected from the group consisting of sulfonate rust preventives and carboxylic acid rust preventives. The grease composition of the invention shows excellent anti-fretting properties at low temperature, and at the same time, exhibit excellent rust preventing properties.

Grease composition for hub unit bearing

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Fujisawa, Japan

Takashi Azuma