公开(公告)号：US20230175553A1

公开(公告)日：2023-06-08

申请号：US17799069

申请日：2021-01-27

申请人： NSK LTD.

发明人： Hirofumi ITO ,  Masahide NATORI ,  Hideyuki HIDAKA

IPC分类号： F16C33/58 ,  F16C19/06 ,  F16C33/64

CPC分类号： F16C33/585 ,  F16C19/06 ,  F16C33/64 ,  F16C2204/60 ,  F16C2220/60

摘要： 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.

公开(公告)号：US20240352973A1

公开(公告)日：2024-10-24

申请号：US18683986

申请日：2022-05-27

申请人： NSK LTD.

发明人： Masahide NATORI ,  Hiroki KOMATA

IPC分类号： F16C33/62

CPC分类号： F16C33/62 ,  F16C2202/04 ,  F16C2204/64 ,  F16C2204/70 ,  F16C2223/10

摘要： There is provided a rolling bearing capable of suppressing the occurrence of white structure spalling. 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.

公开(公告)号：US20220268316A1

公开(公告)日：2022-08-25

申请号：US17631178

申请日：2021-04-07

申请人： NSK Ltd.

发明人： Hirofumi ITO ,  Takahito SHIMADA ,  Masahide NATORI ,  Hideyuki HIDAKA ,  Hayato ISHIGAMI ,  Hiroki KOMATA

IPC分类号： F16C33/64 ,  F16C19/06 ,  F16C33/62 ,  G01M13/04 ,  G01N3/40

摘要： 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.