Panasonic Corporation

Katsuo Ishikawa

Tsutomu Hamada

A hydrodynamic bearing device including a sleeve (), a shaft (), and oil (). With respect to the sleeve (), a stepped portion () provided at one end and an inner peripheral face () extending linearly in the axial direction and continuously with the stepped portion () are formed by a working method that involves the use of a metal mold. The shaft () is inserted so as to be capable of relative rotation with respect to the inner peripheral face () of the sleeve (). The oil fills the space formed between the inner peripheral face of the sleeve and the outer peripheral face of the shaft. Dynamic pressure generation grooves (and), which open in the axial direction at at least one end in the axial direction of the inner peripheral face () and are continuous in the axial direction from one end, are formed in the inner peripheral face.

Hydrodynamic bearing device and spindle motor that makes use of same

A spindle motor including a rotor hub which is rotationally driven by a magnetic action of a rotational magnetic field generated when a current is applied to a wire wound around teeth of a stator core and a magnetic field of a magnet provided on a rotor. Herein, the stator core formed by laminating magnetic steel plates is mounted to an outer periphery of a supporting part of a rotation support shaft of the rotor hub, and the supporting part is made of sintered metal containing a ferromagnetic material. This spindle motor can suppress generation of vibration and noise even when it is reduced in size.

Growing community of inventors

Ehime, Japan

Katsuo Ishikawa