ROLLING BEARING AND BEARING UNIT FOR SUPPORTING WHEEL

摘要

PROBLEM TO BE SOLVED: To perform optimization of quality of a hardening layer in consideration of a case that a high load exceeding a static rated load sometimes acts or an actual plastic deformation amount, in a roller bearing formed with a hardening layer through induction hardening and a roller bearing unit for supporting a wheel.SOLUTION: This invention relates to a rolling bearing in which at least an outer ring raceway surface is processed by induction hardening and an effective hardening layer depth [Y] becoming 500 HV and a maximum shearing stress depth [Z] in the outer ring and a roller when the maximum contact surface pressure in which the outer ring and the roller contact is 4.2 GPa satisfies [(Y/Z)≥8], and a roller bearing unit for supporting a wheel including the roller bearing and satisfying [0.25 D≤Y<0.36 D] in respect to a diameter [D] of the roller.SELECTED DRAWING: Figure 1