Patent ID: 7121003

Claim:
A manufacturing method for a wheel-support rolling bearing unit for manufacturing a wheel-support rolling bearing unit provided with; an outer diameter raceway member having first and second outer raceways on an inner peripheral surface, an inner diameter raceway member having first and second inner raceways on an outer peripheral surface, and a plurality of rolling elements provided so as to rotate freely between the first and second inner raceways and the first and second outer raceways, the inner diameter raceway member comprising; a shaft member provided with the first inner raceway on the outer peripheral surface of a middle portion either directly or via a separate inner ring, and an inner ring provided with the second inner raceway on the outer peripheral surface, and the inner ring is fitted onto one end of the shaft member, and one axial end surface is held by means of a crimped portion formed by plastically deforming a cylindrical portion provided on one end of the shaft member outwards in the radial direction, so that the inner ring is supported and fastened to the shaft member, the method comprising: applying a load by a compression member to a part around the periphery of the cylindrical portion, towards the other end in the axial direction, and outwards in the radial direction, and changing the part to which this load is applied continuously around the peripheral direction of the cylindrical portion so that the cylindrical portion is gradually plastically deformed to form the crimped portion, wherein the outer diameter raceway member is rotated in one direction in relation to the inner diameter raceway member, so that the rolling elements are rotated between the outer raceways and the inner raceways, and the cylindrical portion is pressed by the compression member to form the crimped portion, and this forming work is conducted with a rotational velocity n C (min −1 )of the rolling elements, and a rotational velocity n T (min −1 )of the compression member, being mutually different.