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:
Oct. 25, 2011
Filed:
May. 24, 2004
Hidenobu Mikami, Kuwana, JP;
Seiji Okamura, Kobe, JP;
Hiroki Iwamatsu, Kobe, JP;
Masashi Mitsuoka, Kobe, JP;
Hidenobu Mikami, Kuwana, JP;
Seiji Okamura, Kobe, JP;
Hiroki Iwamatsu, Kobe, JP;
Masashi Mitsuoka, Kobe, JP;
NTN Corporation, Osaka, JP;
Abstract
A rolling bearing, for use in household appliances, having a high degree of quietness, an excellent durability at high temperatures and rotational speeds, a low torque, and excellent fretting property; and a lubricant composition which can be sealed into the rolling bearing. The lubricant composition includes a base oil and a thickening agent. The base oil is a mixed oil having the following characteristics of (a) to (c): (a) The base oil consists essentially of a synthetic hydrocarbon oil and an ester oil; (b) A kinematic viscosity of the mixed oil at 40° C. is 40 to 70 mm/second; (c) A mixing weight ratio between the ester oil of the mixed oil and the synthetic hydrocarbon oil thereof is 30:70 to 70:30. The thickening agent comprises a diurea compound shown by a formula (1): where Rand Rare a straight-chain alkyl groups having 9 to 22 carbon atoms respectively, and Ris an aromatic hydrocarbon group having 6 to 15 carbon atoms. The lubricant composition is sealed into the rolling bearing.