Nidec Corporation

Akio Tatsumi

Takehito Tamaoka

Kazushi Miura

Mitsuhiro Takemoto

Akihiro Yudate

Takayuki Ishino

Akinobu Sumiji

Shigeki Horiki

Kiyofumi Inoue

Katsuki Yamaguchi

Yoshitsugu Hideshima

Takashi Fujiwara

A base plate of a disk drive apparatus includes a motor base disposed around a central axis and a base body portion extending radially outward of the motor base. The motor base is made of a metallic material of a first type. The base body portion is made of a metallic material of a second type. Thus, the axial thickness of a portion of the base plate close to the central axis can be significantly reduced and a reduction in the stiffness of the portion can be prevented. Further, the motor base includes a flange portion and a plastic deforming portion. The flange portion and the plastic deforming portion are respectively in contact with at least a portion of both axial end surfaces of an inner end portion of the base body portion. Thus, extraction of the motor base in the axial direction is prevented.

Base plate of motor including flange portion and plastic deforming portion and disk drive apparatus

A method of manufacturing a bearing mechanism of a motor includes steps a)-e). In step a), a bearing assembly is assembled. In step b), an upper seal gap between an upper thrust portion and an upper hub annular portion is arranged to face downward to increase the width of a gap between an outer tubular portion and a flange portion, or a lower seal gap between the outer tubular portion and a lower hub annular portion is arranged to face downward to increase the width of a gap between the upper thrust portion and the flange portion. In step c), pressure in all gaps is reduced. In step d), lubricating oil is injected into the upper or lower seal gap which faces upward, and a predetermined time or longer is allowed to pass. In step e), pressure is returned to atmospheric pressure.

Method of manufacturing fluid dynamic bearing mechanism, motor, and storage disk drive

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Kyoto, Japan

Akio Tatsumi