Other

Hitachi Powdered Metals Co., Ltd.

Tadayoshi Yano

Hidekazu Tokushima

Toshikazu Takehana

Katsutoshi Nii

Yuji Yoshitomi

Hideo Shikata

Jun Hirose

Tsutomu Nozaki

A spindle motor having a bearing housing and a thrust bearing fitted in the bearing housing at the lower end of the latter, in which an inclined part is formed on the outer peripheral edge at the lower end of the thrust bearing, and the outer diameter part of the thrust bearing is fitted in a coupling bore formed in the end surface of the bearing housing, the end surface of the bearing housing being pressed uniformly in the axial direction over the entire circumference around the coupling bore to cause the bearing housing to plastically flow around the coupling bore in order to cover the above-mentioned inclined part of the thrust bearing. The above-mentioned covering part formed in the bearing housing through plastic flow can exhibit a high bonding strength between the bearing housing and the thrust bearing in the spindle motor without deteriorating the sealing ability of the spindle motor, due to a shearing force and a residual contact pressure of the covering part.

Spindle motor and manufacture thereof

A spindle motor comprises a housing including a through hole with a pair of apertures, one of the apertures being closed by a thrust plate and the other aperture being open; a bearing accommodated in the housing a rotating shaft inserted into the bearing a displacement restraining structure for restraining movement of the rotating shaft toward the open aperture by engaging the rotation shaft with the bearing a rotating member secured to the rotating shaft; and a motor generating electromagnetic function for rotating the rotating member. The through hole of the housing includes a large diameter portion A at the thrust plate side and a small diameter portion B at the open aperture side, and a stepped portion is formed at a transition portion between the large diameter portion A and the small diameter portion B. At least a portion of the bearing is located at the large diameter portion A side of the housing and engages with the stepped portion of the housing

Spindle motor

Disclosed is a process for manufacturing a sintered slide bearing. A sintered porous bearing body is prepared from a powdered metal material and a resin material in a fluidable state is penetrated into the sintered porous bearing body. The resin material in the sintered porous bearing body is hardened, and the sintered porous bearing body after the hardening of the resin material is repressed to reduce a gap produced between the sintered porous bearing body and the hardened resin material by volume reduction caused on the resin material at the hardening.

Process for manufacturing sintered slide bearing

Growing community of inventors

Kashiwa, Japan

Tadayoshi Yano