Rotating apparatus capable of improving the shock resistance and method for manufacturing the rotating apparatus

摘要

A rotating apparatus includes a hub, a shaft housing portion having a center through-hole, a base plate, and a shaft with a cylindrical section housed in the through-hole. At a joint between the shaft housing portion and the hub is formed a bonding region for bonding the shaft housing portion and the hub by a hardening resin, and a narrow-gap region more toward the base plate than the bonding region. A gap between the shaft housing portion and the hub in the narrow-gap region is narrower than a gap between the shaft housing portion and the hub in the bonding region. The hub includes a fourth circumferential recessed portion recessed in the axial direction and a lower circumferential raised portion projecting in the axial direction on a radially inner side of the fourth circumferential recessed portion. The narrow-gap region is located inside the lower circumferential raised portion.

主权项

1. A rotating apparatus comprising:
a rotatable rotor including a hub on which a recording disk is to be placed, and a shaft housing portion having a through-hole in a center; a base plate having a base circular part extending in an axial direction of the hub wherein an inner circumferential surface of the base circular part is used as a bearing hole; a shaft including a cylindrical section housed in the through-hole, an extending section extending radially outwardly from a first end of the cylindrical section, and an annular section provided radially outwardly from a second end of the cylindrical section remote from the extending section; and a groove that is configured to generate a radial dynamic pressure and that is provided on an inner circumferential surface of the through-hole, wherein the extending section is inserted and fixed into the bearing hole, wherein at a joint between the shaft housing portion and the hub is formed a bonding region for bonding the shaft housing portion and the hub by a hardening resin interposed between the shaft housing portion and the hub, and a narrow-gap region more toward the base plate than the bonding region in the axial direction, wherein a gap between the shaft housing portion and the hub in the narrow-gap region is narrower than a gap between the shaft housing portion and the hub in the bonding region, wherein the hub includes, toward the base plate, a fourth circumferential recessed portion which is recessed in the axial direction and a lower circumferential raised portion projecting in the axial direction on a radially inner side of the fourth circumferential recessed portion, and wherein the narrow-gap region is located inside the lower circumferential raised portion.