Wheel bearing assembly, manufacturing method therefor, and calk jig

摘要

The axial length of an annular protrusion (18) formed around a calk fixation portion (17) of an outer end surface (16) of a wheel hub (12) is set at such a length that the annular protrusion (18) does not interfere with the calk punch (32) when the calk punch (32) is oscillatingly turned. Besides, an outer surface of the calked portion (25) formed on a distal end of a center shaft portion (22) is inclined toward an inner side at an angle ranging from -5 degrees to 15 degrees with respect to a plane perpendicular to the center axis of the center shaft portion (22).