Roller bearing provided with flanges

In a roller bearing including inner and outer rings with an annular space defined between said rings, the space and the rings having corresponding first and second ends, a plurality of roller elements in said space, and sealing means extending from one of said rings to the other for closing the roller elements within said two ends of said annular space, the improvement in combination therewith comprising first, second, and third flanges, wherein said first flange comprises a junction part adjacent the first end of said inner ring and an outer part extending generally radially outward from said junction part, said second flange extends generally radially inward from said second end of the inner ring, said third flange extends generally radially outward from said outer ring, with said roller elements being situated generally axially intermediate said first and second flanges, said first end of the outer ring formed as a collar having an outer periphery, and said sealing means of said first end comprising an elastic material having a relatively thickened part secured on said collar and a relatively thinner part extending to and engaging said inner ring in sliding contact.