Nsk Corporation

Takaaki Anzai

Naoki Matsuyama

Yasushi Morita

Kenji Yakura

Sumio Sugita

Yu Koiwa

Tamotsu Misawa

Saburo Azumi

Masaru Terasaki

Ken Inaba

A rolling bearing includes an inner ring having an outer surface, an outer ring having an inner surface, a plurality of rolling elements rotatably disposed between the inner ring and the outer ring, and a retainer for retaining the rolling elements. The retainer is made of a resin material and is positioned with respect to the inner surface of the outer ring or the outer surface of the inner ring. The retainer includes a pair of annular portions axially arranged in parallel and a columnar portion coupling the annular portions. Then, the rolling bearing satisfies the following expression:AI=LH/dm&#x2265;0.025LH/dm&#x2265;0.025 mmin which H is a radial length of a section of the annular portion, L is an axial length of the same, and dm is PCD of the rolling element.

Rolling bearing and spindle apparatus for machine tool

A cylindrical roller bearing with synthetic resin cages, in which heat generation of the bearing during high speed rotation is suppressed, while sufficient rigidity and strength is secured, so that the bearing is excellent in high speed performance. The cylindrical roller bearing () has synthetic resin cages () each including an annular portion () disposed in one axial end portion of the cage (), and a plurality of columnar portions () extending from a side surface of the annular portion (). The minimum inner diameter d1 of the annular portion () is set to be smaller than the maximum inner diameter d2 of each columnar portion (), and the inner diameter of the columnar portion () is set to be equal to the inner diameter d1 of the annular portion () over a range of length not longer than &#x2154; of the whole length of the columnar portion ().

Double row cylindrical roller bearing

A grease-lubricated rolling bearing has an outer ring having an outer ring race in an inner peripheral surface thereof, an inner ring having an inner ring race on an outer peripheral surface thereof, rolling elements rollably provided between the outer ring race and the inner ring race, and a grease supply element for supplying an additional grease in the rolling bearing. The amount of the additional grease to be supplied at a time is predetermined to be from 0.1 to 4% of the volume of space in the bearing.

Rolling bearing and spindle device for machine tools

An angular contact ball bearing includes an outer ring having an outer ring race formed on an inner surface thereof, an inner ring having an inner ring race provided on the outer surface thereof, a plurality of rolling elements provided between the outer ring and the inner ring, an annular cage for retaining the rolling elements, and seals provided on openings between the respective ends of the inner and outer rings. The cage is made of a synthetic resin material and is supported through the guide of the rolling elements. The cage includes a plurality of cylindrical pockets arranged peripherally for retaining the rolling elements and a reduced diameter portion formed at ends of the pocket for regulating the radial movement of the cage while being in contact with the rolling element.

Angular contact ball bearing and spindle device

A rolling bearing includes an inner ring having an outer surface, an outer ring having an inner surface, a plurality of rolling elements rotatably disposed between the inner ring and the outer ring, and a retainer for retaining the rolling elements. The retainer is made of a resin material and is positioned with respect to the inner surface of the outer ring or the outer surface of the inner ring. The retainer includes a pair of annular portions axially arranged in parallel and a columnar portion coupling the annular portions. Then, the rolling bearing satisfies the following expression: AI&equals;LH /dm&gE;0.025 in which H is a radial length of a section of the annular portion, L is an axial length of the same, and dm is PCD of the rolling element.

Growing community of inventors

Kanagawa, Japan

Takaaki Anzai