Patent ID: 9046132
Filing Date: 2015-06-02
Classification: C10M,C10N,F16C

Abstract:
1. A rolling bearing, which is incorporated in a wind power generator, said rolling bearing comprising a plurality of rolling elements interposed between an inner ring and an outer ring such that said rolling elements are capable of rolling; a grease composition being packed inside a space, formed between said inner ring and said outer ring, in which said rolling elements are disposed, said grease composition comprising a base oil, a thickener, and an additive, wherein said base oil comprising synthetic oil having a kinematic viscosity at 40° C. of 300 to 600 mm wherein said additive contains at least one kind selected from among a phosphite ester shown by a chemical formula (1) or a phosphite ester shown by a chemical formula (2); a content of said phosphite ester is 0.5 to 4 parts by weight for 100 parts by weight which is a total of an amount of said base oil and that of said thickener; and said additive contains neither phosphite esters other than said phosphite ester shown by said formula 1 or by said formula (2) nor phosphate esters having organic groups whose carbon number is not less than three: In chemical formulas (1) and (2), R