Nsk Corporation

Masahide Natori

Hideyuki Hidaka

Hirofumi Ito

Nobuaki Mitamura

Hidenobu Magami

Takamasa Ohira

Tohru Ueda

Ichiro Joko

Hiroki Komata

Hayato Ishigami

Takahito Shimada

Tsuyoshi Nomura

A rolling bearing contains a structure having a solid solution carbon amount in a martensitic structure after heat treatment of 0.35 mass % or more and 0.65 mass % or less and a volume ratio of spheroidized carbides having a diameter of 200 nm or more of 4.5% or less.

Rolling bearing

A method for measuring indentation resistance includes: obtaining a first curve indicating a yield shear stress in a depth direction of a raceway surface of a material forming a rolling bearing in a state before the raceway surface is subjected to machining, a second curve indicating a static shear stress in the depth direction of the raceway surface in a state in which the raceway surface is subjected to the machining, and a third curve indicating a static shear stress in the depth direction of the raceway surface in a state in which rolling elements are in contact with the raceway surface and a static load is applied to the raceway surface; and obtaining a correlation between an area and an indentation depth of the raceway ring by defining a region surrounded by exceeding the first curve and the second curve and falling below the third curve as the area.

Indentation resistance measurement method, indentation resistance prediction method for rolling bearings, machining condition selection method, bearing material quality selection method, burnishing condition selection method, and bearing manufacturing method

In a raceway surface of at least one of an inner ring and an outer ring, a region not affected by machining is set as a first region, and a region, which has (a) a machining amount of 0.03 or more, (b) an amount of residual austenite being 70% or more of an amount of retained austenite in the first region, and (c) a compressive residual stress being higher by 500 MPa or more than a compressive residual stress in the first region, is set as a second region.

Rolling bearing and method for producing same

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

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Kanagawa, Japan

Masahide Natori