WHEEL SUPPORT ROLLING BEARING UNIT PRODUCING METHOD AND PRODUCING DEVICE

摘要

In a wheel support rolling bearing unit producing method and producing device, in order to prevent indentations from being formed in a second outer ring raceway (6a) and in a second inner ring raceway (12a) when a crimp (14) is to be formed in the end of a hub main body (8a) by orbital forging using a pressing die (26) while preventing the upsizing of the installation, according to the invention the outer ring (1a) is rotated by a motor (48) to cause balls (32) to make an orbital motion. A difference is provided between the orbital motion speed of the balls (32) and the whirling speed of the pressing die (26). Preferably, this difference should be 10 min<-1> or more. The orbital motion of the balls (32) prevents indentations from being formed in the second outer ring raceway (6a) and in the second inner ring raceway (12a). Further, the provision of the difference between the orbital motion speed and the whirling speed of the pressing die (26) suppresses an increase in the torque required for rotation drive of the outer ring (1a).