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.

公开(公告)号：US20160108491A1

公开(公告)日：2016-04-21

申请号：US14978528

申请日：2015-12-22

申请人： NSK LTD.

发明人： Hideyuki HIDAKA ,  Daisuke WATANUKI ,  Kazuki TAMURA

IPC分类号： C21D9/40 ,  F16C33/64 ,  C22C38/02 ,  C21D1/42 ,  C22C38/44 ,  C22C38/04 ,  F16C33/62 ,  C21D6/00

CPC分类号： C21D9/40 ,  C21D1/09 ,  C21D1/42 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/44 ,  F16C19/06 ,  F16C19/26 ,  F16C19/364 ,  F16C19/38 ,  F16C33/585 ,  F16C33/62 ,  F16C33/64 ,  F16C2202/04 ,  F16C2240/40 ,  F16C2300/02 ,  Y02P10/253

摘要： A rolling bearing in which at least one of the bearing rings is obtained by applying a induction heat treatment to a spheroidizing annealed steel material having a DI value of 1.0 or more to form a hardened layer having a hardness of 550 HV or more on at least a raceway surface and a fitting surface. In the induction heat-treated bearing ring, (A) an average retained austenite amount is 12 vol % or less, (B) the raceway surface has a retained austenite amount of 12 vol % or more and a residual compressive stress of −100 MPa or less, and (C) a difference between a hardness of the raceway surface and a minimum hardness of a region having a hardness of less than 550 HV is 150 HV or more.

摘要翻译： 一种滚动轴承，其中至少一个轴承环是通过对具有DI值为1.0以上的球化退火钢材进行感应加热处理得到的，至少至少形成硬度为550HV以上的硬化层 轨道表面和配合表面。 在感应热处理轴承环中，（A）平均残留奥氏体量为12体积％以下，（B）轨道面的残留奥氏体量为12体积％以上，残余压应力为-100MPa 以下（C），轨道面的硬度与硬度小于550HV的区域的最小硬度之差为150HV以上。

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.