Hitachi, Ltd.

Japan Servo Co.,ltd.

Masaaki Nakano

Tomoaki Inoue

Kenji Mori

Takashi Yoshida

Hideaki Amano

Kenji Tomida

Takashi Kono

Kazuhiko Kawaike

Akira Suzuki

Hiroshi Nishida

Yuji Yamamoto

Hiroaki Yoda

Kinpei Okano

Yuji Nishimura

Osamu Beppu

Takashi Kohno

Sachio Hatori

Akio Takatsuka

Shunzo Tomioka

Kenzo Kajiwara

Masanori Katayama

Shizuichi Sakamoto

Eiichi Okuyama

Kohji Aizawa

Takeru Sato

Shunzoo Tomioka

Kousaku Shimizu

Motoyuki Ishikawa

The present invention relates to a bearing used in a transmission. The radial bearing for supporting a rotating shaft of the transmission has a substantial elliptical-cylinder-shaped inner circumferential surface. At least two lubricating resin members are provided on the inner circumferential surface so that the members are extending in the axial direction and symmetric with respect to the central axis of the bearing. The rigidity of the bearing is increased as increasing the rotation speed of the shaft.

Radial bearing and transmission using the same

A recording disk apparatus comprises a clearance between a shaft and a thrust bearing portion tapered in a circumferential direction, a lubricant communication groove of a bearing covered by the shaft so that a lubricant on a radial bearing portion communicates with the lubricant on the thrust bearing portion through the lubricant communication groove, a lubricant circulating path which extends axially from the thrust bearing portion to the radial bearing portion to prevent the lubricant flowing out of the thrust bearing portion from returning directly to the thrust bearing portion without passing the radial bearing portion, and/or a clearance between a slide bearing and a magnetic fluid seal device substantially filled with a magnetic fluid lubricant.

Recording disk apparatus and rotational supporting structure therefor,

A bearing device where a sliding bearing rotatably supporting a shaft is molded with an inexpensive sintered material, three asymmetrical circular arc-shaped radial bearings are formed in the inner peripheral surface of the shaft, taper land-shaped thrust bearings are formed in the opposite end surfaces of the radial bearing surface, T-shaped bubble removing means which is constituted by axial and radial flow passages formed in the shaft opposed to the radial bearing is provided, and magnetic fluid is used as a lubricant. A magnetic disk unit using the bearing device is also disclosed.

Bearing device and spindle motor provided with the bearing device

Recording disk apparatus and rotational supporting structure therefor

A rotor magnet is attached to the inner peripheral portion of a hub to attach a magnetic disk or the like and a stator is provided in the outer peripheral portion of a bearing housing so as to face the rotor magnet, thereby forming a rotating mechanism. A magnetic pre-load mechanism is provided and a spindle is pressed to one side of a radial bearing, thereby stabilizing the rotation.

Spindle unit having pre-load mechanism

A bearing device for a horizontal shaft type rotating machine includes an oil tank formed at the lower portion of the bearing box for storing lubricant oil for the bearing, the oil tank being divided by a bearing support plate between an oil feeding chamber and an oil collecting chamber; an oil feeding apparatus which pumps up the lubricant oil in the oil feeding chamber and feeds the lubricant oil onto the bearing; and a pair of diffusion flow passages; each of the pair of diffusion flow passages being formed along the inner wall of the oil tank and connects the oil collecting chamber with the oil feeding chamber; each of the diffusion flow passages permitting diffusion and movement of the lubricant oil from the oil collecting chamber to the oil feeding chamber. Each of the diffusion flow passages including a baffle chamber and a narrow gap flow passage downstream of the baffle chamber and having a smaller cross section flow passage area than the baffle chamber and the upper portion of the baffle chamber being open to the air, whereby air bubbles contained in the collected high temperature lubricant oil are removed at an early stage of their return travel from the oil collecting chamber to the oil feeding chamber.

Bearing device for horizontal shaft type rotating machine

A bearing apparatus for a rotary machine having a horizontal rotating shaft comprises a bearing for supporting the horizontal rotating shaft, a bearing box for supporting the bearing therein, a lubricating oil tank disposed in a lower portion of the bearing box for storing lubricating oil, a lubricating supply device for picking up the lubricating oil in the lubricating oil tank and supplying the lubricating oil to the bearing, and oil guide device disposed beneath the bearing and allowing the lubricating oil discharged from the bearing to flow along a side wall of the bearing box to be stored in the lubricating oil tank.

Bearing apparatus for a rotary machine having a horizontal rotating shaft

A vertical motor pump including an upper bearing and a lower bearing located on the motor side for journaling a rotary shaft for rotation at an upper portion and a lower portion respectively of a rotor, at least one of the upper and lower bearings being constituted by a ball bearing. The vertical motor pump further includes a hydrostatic lubricated bearing system for journaling the rotary shaft besides the ball bearing, for bearing a radial thrust during operation.

Vertical motor pump

An impeller secured to a shaft in a vertical type sodium turbine pump is interposed between a suction tube and an impeller casing. A mouth ring in an impeller is positioned in the close proximity of a lower ring secured to the suction tube, while an impeller ring protruding from a crown ring is positioned in the close proximity of an upper ring secured to an impeller casing, with a given clearance maintained therebetween. Pockets are provided in the surface of the mouth ring positioned close to the lower ring as well as in the surface of the impeller ring positioned close to the upper ring, so that there may be produced a static bearing action by molten sodium between the mouth ring and the lower ring, as well as between the impeller ring and the upper ring.

Sodium turbine pump

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Hitachi, Japan

Masaaki Nakano