公开(公告)号：US10208798B2

公开(公告)日：2019-02-19

申请号：US14917008

申请日：2014-09-05

申请人： NTN CORPORATION

发明人： Noriaki Miwa ,  Yukio Matsubara

IPC分类号： F16C33/62 ,  C22C38/02 ,  C22C38/04 ,  C22C38/44 ,  B60B27/00 ,  F16C33/34 ,  C23C8/26 ,  C21D9/40 ,  C22C38/40 ,  C22C38/50 ,  C21D9/32 ,  C22C38/00 ,  C21D1/06 ,  C22C38/18 ,  F16C33/32 ,  C21D1/25

摘要： Provided is a rolling device in which hydrogen is not easily accumulated within a roller element made of steel, such as an inner race and an outer race, and premature separation due to hydrogen embrittlement is prevented from occurring. A rolling bearing 1 having an inner race 2, an outer race 3, and rolling bodies 4, and at least one selected from the inner race 2, the outer race 3, and the rolling bodies 4 is made of predetermined steel. At least a part of oxide-based inclusions included in the steel is covered by MnS, and a ratio of a number of oxide-based inclusions covered by MnS is over 40% of a total number of oxide-based inclusions having maximum diameter of 3 μm or greater in the steel.

公开(公告)号：US10156259B2

公开(公告)日：2018-12-18

申请号：US14896265

申请日：2014-05-28

申请人： NTN CORPORATION ,  Chikara Ohki ,  Yukio Matsubara ,  Daisuke Sato ,  Noriaki Miwa

发明人： Chikara Ohki ,  Yukio Matsubara ,  Daisuke Sato ,  Noriaki Miwa

IPC分类号： F16C33/62 ,  C21D9/40 ,  C21D1/06 ,  C22C38/00 ,  C22C38/18 ,  F16C33/64 ,  C22C38/02 ,  C22C38/04 ,  C22C38/20 ,  C22C38/22 ,  C22C38/42 ,  C22C38/44 ,  C23C8/32 ,  F16C19/06 ,  F16C33/32

摘要： A bearing component composed of steel which contains carbon not less than 0.95 mass % and not more than 1.1 mass %, silicon less than 0.3 mass %, manganese less than 0.5 mass %, sulfur less than 0.008 mass %, and chromium not less than 1.4 mass % and less than 1.6 mass % and is composed of remainder iron and an impurity and having a carbonitrided layer formed at a surface portion including a contact surface which is a surface in contact with other components is provided. An average concentration of nitrogen in the surface portion is not lower than 0.3 mass % and not higher than 0.6 mass % and variation in nitrogen concentration in the surface portion is not higher than 0.1 mass %. An amount of retained austenite in the surface portion is not greater than 8 volume %.

公开(公告)号：US10094422B2

公开(公告)日：2018-10-09

申请号：US14895901

申请日：2014-05-28

申请人： NTN CORPORATION

发明人： Chikara Ohki ,  Yukio Matsubara ,  Daisuke Sato

IPC分类号： F16C33/62 ,  C21D9/40 ,  C23C8/32 ,  C22C38/00 ,  C22C38/18 ,  F16C33/32 ,  F16C33/34 ,  C22C38/02 ,  C22C38/04 ,  C22C38/20 ,  C22C38/22 ,  C22C38/42 ,  C22C38/44 ,  C21D9/38 ,  C21D1/76 ,  C21D1/06

摘要： A bearing component composed of steel which contains carbon not less than 0.95 mass % and not more than 1.1 mass %, silicon less than 0.3 mass %, manganese less than 0.5 mass %, sulfur less than 0.008 mass %, and chromium not less than 1.4 mass % and less than 1.6 mass % and is composed of remainder iron and an impurity and having a carbonitrided layer formed at a surface portion is provided. An average concentration of nitrogen in the surface portion is not lower than 0.3 mass % and not higher than 0.6 mass % and variation in nitrogen concentration is not higher than 0.1 mass %. An amount of retained austenite is not greater than 8 volume %. An area ratio of a precipitate in the inside where no carbonitrided layer is formed is not lower than 11%.