Samsung Electro-mechanics Japan Advanced Technology Co., Ltd.

Akira Aoi

Ryusuke Sugiki

Mitsuo Kodama

Hiromitsu Goto

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.

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

A rotating apparatus includes a hub, a shaft housing portion having a center through-hole, and a base plate, having a base circular part that extends axially and with an inner surface thereof used as a bearing hole. Further included is a shaft with a cylindrical section housed in the through-hole, an extending section formed integrally with the cylindrical section and extending radially from a first end of the cylindrical section, and an annular section provided radially from a second end of the cylindrical section. Provided on the inner surface of the through-hole is a groove configured to generate radial dynamic pressure in lubricant. The rotatable rotor includes a portion encircling at least part of the annular section. An opening of the bearing hole surrounds a part of the shaft housing portion, the extending section inserted and fixed into the opening, with a hardening resin interposed therebetween.

Rotating apparatus with increased inner diameter of bearing hole opening

A disk drive device includes a hub, a base plate, and a bearing unit. The bearing unit includes a shaft housing member, joined to the hub, having a through-hole in the center, a shaft having a smaller diameter section and a larger diameter section, a radial dynamic pressure grooves, and a lubricant agent. The opening shape of bearing hole of the base plate is so formed as to be larger than the outer shape of the larger diameter section. In the bearing unit, the larger diameter section of the bearing unit is fixed by a hardening resin present between the bearing unit and the bearing hole.

Rotating apparatus capable of improving the shock resistance

A disk drive device includes a base plate, a hub, and a bearing unit. The bearing unit includes an outer sleeve, an inner sleeve, a shaft, a radial dynamic pressure groove, and a lubricant agent. In the joined portion of the outer sleeve and the hub, there are formed a recessed portion, which is a binding region, where the outer sleeve and the hub are joined together with a hardening resin present between the outer sleeve and the hub and a tilt preventing portion, provided on both the sides of the recessed portion in the axial direction of the outer, which is a raised region that forms a portion narrower than a gap, between the outer sleeve and the hub, corresponding to the recessed portion.

Growing community of inventors

Shizuoka, Japan

Akira Aoi