Nsk Corporation

Hidenobu Magami

Nobuaki Mitamura

Yuji Shimomura

Yukio Sato

Shunichi Kiyono

Tomoyuki Aizawa

Makoto Koganei

Masahide Natori

Masateru Kondo

Sadayuki Tanaka

Tohru Ueda

Takamasa Ohira

Ichiro Joko

Masafumi Fukunaga

Tadahiro Hoshino

Tsuyoshi Nomura

Hidekazu Yoshiwara

Toshiharu Takamura

Hideo Fujihara

Keizo Ishihara

In a tapered roller bearing, neighboring pillar parts constitute a first engagement allowance in which an inner diameter-side opening width of each of the pockets becomes smaller than a roller diameter at a position of the opening width in a direction of a rotation axis of each of the tapered rollers at at least a part of an inner diameter side of each of the pockets, and constitute a second engagement allowance in which an outer diameter-side opening width of each of the pockets becomes smaller than the roller diameter at a position of the opening width in the direction at at least a part of an outer diameter side of each of the pockets. Bumps are formed on an inner surface of the small diameter ring part in the pockets. Small diameter-side end faces of the tapered rollers facing the bumps are substantially flat surfaces.

Tapered roller bearing and manufacturing method for tapered roller bearing

A bearing residual life prediction method, a bearing residual life diagnostic apparatus and a bearing diagnostic system can be provided. The bearing diagnostic systemincludes: an eddy current testerthat measures the impedance X of a certain portion of a bearingbefore and after the use of the bearing; a bearing information transmitterthat transmits bearing information scontaining the impedance X; and a bearing information receiverthat receives the information; a diagnostic sectionthat obtains the residual life information sof the bearingbased on the received impedance X; and a life information transmitterthat transmits the residual life information s; and a life information receiverthat receives the information. Hence, the bearing used by the user can be inspected nondestructively, and the residual life of the bearing can be predicted.

Bearing residual life prediction method, bearing residual life diagnostic apparatus and bearing diagnostic system

Both outer-side inner ring elementsapply preload to respective tapered rollersby being pressed from both sides in an axial direction by an outwardly-directed, flange-like collar, formed on an outer circumferential surface of one end among both ends in the axial direction of an inner-side outer ring member, and by a holding ring, mounted on the other end of the inner-side outer ring member, or by a pair of holding rings, mounted on both ends in the axial direction of the inner-side outer ring member. A double row tapered roller bearing unit having good assembly precision, being easy to process, and enabling preload control and preload readjustment to be performed with ease is thereby provided.

Double row tapered roller bearing unit

A sealing device for a roll bearing which includes an outer ring, an inner ring, a rolling element rotatably interposed between the outer and inner rings, and a retainer, comprises a seal holder having a seal holder portion and a seal body attached to the seal holder portion. A portion of the retainer is received in a sealing space defined by the seal holder portion while the portion of the retainer is being disposed outside a range of interference with the seal holder portion. The sealing device further comprises conical surfaces,and,which are provided as fitting surfaces of a seal holder portion,and a seal body,fit to the seal holder portion,. Accordingly, a space,into which one end of a retainer of the bearing is receivable can be formed, and the inside diameter d of the seal holder portion,can be reduced.

Sealing device for a rolling bearing

A thrust bearing for use in a rolling mill, having a pair of each of working rolls and stay rolls as well as a mechanism for crossing the rolls, is provided with retainers in which pockets for retaining rolling bodies are arranged in a plurality of rows. Each rolling body, when accommodated in the pocket, has the rotating axis passing substantially the center of swing motions, which makes the bearing appropriate to the swing motions of the rolling mill. Also, centering mechanisms, collar members and stoppers are provided for the retainers, so that malfunctions can be effectively prevented.

Swing ladder bearing

Growing community of inventors

Fujisawa, Japan

Hidenobu Magami