Patent ID: 7744284

Claim:
A bearing comprising: an outer member rotatably coupled to an inner ring of the bearing via rolling members; a cylindrical member connected to the outer member; and a plurality of grooves formed on the outer member for firmly connecting the cylindrical member to the outer member, wherein: the plurality of grooves have inclinations relative to an axial direction of the bearing and are formed so that the grooves do not cross one another; the plurality of grooves are grouped into several groups, and the grooves in each group have the same inclination relative to the axial direction of the bearing, when viewed along a direction perpendicular to the axial direction of the bearing, each of the plurality of grooves is provided by a straight line inclined relative to the axial direction of the bearing, the several groups are formed on an outer peripheral surface of the outer member and segmented by predetermined circumferential angles, respectively, and the several groups are separated from each other by predetermined clearances.