Nsk Corporation

Kenji Yakura

Yasushi Morita

Naoki Matsuyama

Takaaki Anzai

Sumio Sugita

Ken Inaba

Koji Ueda

Hirotoshi Aramaki

Dai Kinno

Shoji Noguchi

Yoshifumi Inagaki

Mitsuho Aoki

Yukio Ooura

Yuu Koiwa

Akio Fujii

Saburou Azumi

A spindle unit comprises a rolling bearing including an outer ring having an outer ring raceway on an inner peripheral surface, an inner ring having an inner ring raceway on an outer peripheral surface, and rolling elements provided rollably between the outer ring raceway and the inner ring raceway, whereby a spindle is borne rotatably in a housing, and a grease supply system for supplying a grease to an inside of the rolling bearing, wherein the grease supply system supplies the grease such that a supply amount in one shot is set to 0.004 cc to 0.1 cc.

Rolling bearing, grease supply system, spindle unit, grease supply method, and grease supply program

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

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 grease supply confirming device confirming the supply of a grease into a bearing, according to the present invention includes a detecting member an elastic supporting member and a movable body. The movable body such as a metal spherical body is movably provided in a piping through which a grease to be supplied flows. The elastic supporting member is provided in the piping for supporting the movable body. The detecting member such as an eddy current type displacement sensor detects to see whether or not the grease is supplied in accordance with the displacement of the movable body. The grease supply confirming device further includes an abnormality judging circuit connected to the detecting member for judging the abnormality in grease supply, and an outputting portion for outputting an alarm according to the instruction from the abnormality judging circuit.

Grease supply confirming device and method

A ball bearing in which the heat value in an inner ring is decreased and the heat value in an outer ring is brought closer to the heat value in the inner ring by making the radius of curvature for the inner ring groove larger, and defining the radius of curvature for the outer ring groove as 50.5% to 53.0% of the ball diameter. The arrangement of the present invention suppresses the heat value in the entire ball bearing and extends the bearing life at a reduced cost without using a large flow rate lubrication method or a preloading method such as constant preloading. In addition, a decrease in heat generation, seizing resistance and wear resistance can be attained further by optimizing a relation between the raceway groove and the ball diameter, by optimizing the number of balls, by controlling the ingredient composition for the material of the bearing ring, and by forming a hard deposition film on the surface of the raceway groove. Thus, according to the present invention, a ball bearing having a long life is provided even during high speed rotation at a dmn value of 2,000,000 or more.

Ball bearing

Growing community of inventors

Kanagawa, Japan

Kenji Yakura