Koyo Seiko Company, Ltd.

Yasuo Takamura

Takeshi Takahashi

Daiji Hiraoka

Yasuhiro Kobayashi

Shinji Matsue

The improved sliding bearing provides fitting of a cap into a sleeve with steadily fixation of adhesive, and prevention of the remained adhesive outside of the desired area. The sliding bearing comprises a sleeve, a shaft enclosed in said sleeve, and, a cap fitted into the sleeve, the sleeve having a shouldered hole with a first shoulder on which the cap is held, wherein the internal circumferential surface of the sleeve or the external circumferential surface of the cap includes a second shoulder circumferentially formed thereon. The second shoulder of the sleeve is of an outer diameter larger than the diameter of the cap, and an inner diameter approximately same as or slightly larger than the outer diameter of the cap, while the second shoulder of the cap is of an inner diameter smaller than that of the sleeve, and an outer diameter approximately same as or slightly smaller than the inner diameter of the sleeve.

Sliding bearing

A dynamic pressure bearing is provided in which leakage of liquid lubricant due to precession of a housing can be prevented from occurring. In the dynamic pressure bearing, the inner diameter of a tapered inner peripheral face of the housing which constitutes a capillary sealing portion is gradually increased as moving from an opening toward the inner area in the axial direction. When the housing is rotated, therefore, a centrifugal force applied on liquid lubricant existing on the tapered inner peripheral face 20 acts in the direction along which the liquid lubricant is pushed toward the inner area, as indicated by an arrow . Consequently, the centrifugal force which is due to precession of the housing and which pushes the liquid lubricant toward the outside as indicated by an arrow can be cancelled by the force acting in the direction toward the inner area, with the result that leakage of the liquid lubricant due to precession of the housing can be prevented from occurring.

Dynamic pressure bearing

Bearing device

A dynamic pressure bearing has a large load-carrying capacity, and a ridge portion defined between adjacent grooves is prevented from damaging an opposite surface. The bearing includes an axial bearing surface having dynamic pressure generating grooves formed thereon by plastic working. The bearing has ridge portions defined between the adjacent dynamic pressure generating grooves. A top end of the ridge portion has rounded edge portions and a flat bearing surface defined between the edge portions. Since the edge portions of the top end are rounded, an opposite surface is prevented from being damaged. Further, the presence of the flat bearing surface defined between the edge portions results in increased load-carrying capacity.

Method of manufacturing dynamic pressure bearing having large

There is provided a dynamic pressure bearing which has a large load-carrying capacity and in which a ridge portion defined between adjacent grooves is prevented from damaging an opposite surface. The bearing includes an axial bearing surface having dynamic pressure generating grooves formed thereon by plastic working. The bearing has ridge portions defined between the adjacent dynamic pressure generating grooves. A top end of the ridge portion has rounded edge portions and a flat bearing surface defined between the edge portions. Since the edge portions of the top end are rounded, an opposite surface is prevented from being damaged. Further, the presence of the flat bearing surface defined between the edge portions results in increased load-carrying capacity.

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Yamatokoriyama, Japan

Yasuo Takamura