Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
May 17, 2011
Patent Application Number
11921377
Date Filed
June 6, 2006
Patent Primary Examiner
Patent abstract
A hub bearing, of carbon steel for machine use, which has a long life because of improved resistance to peeling starting from the surface and a grease enclosed in the hub bearing which contains a base oil and a thickener, and in the base oil, the number of naphthenic carbons found by an n-d-M ring analyzing method accounts for 32 to 37% of a whole number of carbon atoms in the base oil. The base oil is a mineral oil or a mixed oil of a mineral oil and a synthetic hydrocarbon oil. The thickener contains 1 to 40 mass % of a urea compound of formula (1):
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