Patent ID: 6464398
Filing Date: 2002-10-15
Classification: F16C

Abstract:
A roller bearing comprising:an outer ring having an outer ring raceway formed on the inner peripheral surface thereof; an inner ring having an inner ring raceway formed on the outer peripheral surface thereof; a flange portion formed on at least one of an end portion of the inner peripheral surface of said outer ring and an end portion of the outer peripheral surface of said inner ring; a plurality of rollers each having an outer peripheral surface and an axial-direction end face, said outer peripheral surface serving as a rolling surface contactable with said outer ring raceway and said inner ring raceway, said axial-direction end face serving as a sliding contact surface slidingly contactable with an inner surface of the flange portion, wherein, where an axial-direction difference between the top and bottom portions of the circumferential-direction undulation of said inner surface of said flange portion is defined as an axial deflection &dgr;, a composite roughness (&sgr;12+&sgr;22)1/2 consisting of the root-mean-square roughness &sgr;1 of said sliding contact surface and the root-mean-square roughness &sgr;2 of said inner surface of said flange portion is defined as a flange/roller composite roughness &sgr;, said flange/roller composite roughness &sgr; and said axial deflection &dgr; can satisfy at least one of following conditions (1), (2) and (3): &dgr;&lE;8 &mgr;m and &sgr;&lE;0.22 &mgr;mRMS;â€ƒâ€ƒ(1) &dgr;&lE;12 &mgr;m and &sgr;&lE;0.18 &mgr;mRMS;â€ƒâ€ƒ(2) â€ƒ&dgr;&lE;16 &mgr;m and &sgr;&lE;0.13 &mgr;mRMS.â€ƒâ€ƒ(3)