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    ROLLING COMPONENT AND ROLLING BEARING
    1.
    发明公开
    ROLLING COMPONENT AND ROLLING BEARING 审中-实审

    公开(公告)号：EP4428261A1

    公开(公告)日：2024-09-11

    申请号：EP22901195.2

    申请日：2022-11-25

    申请人： NTN Corporation

    发明人： YAMADA, Masahiro ,  SATO, Miyu ,  OHKI, Chikara

    IPC分类号： C22C38/00 ,  C22C38/18 ,  C22C38/24 ,  F16C19/06 ,  F16C33/32 ,  F16C33/62 ,  C21D9/40

    CPC分类号： F16C19/06 ,  F16C33/32 ,  F16C33/62 ,  C21D9/40 ,  C22C38/00 ,  C22C38/18 ,  C22C38/24

    摘要： A rolling component (10) has a surface (10a, 10b, 10c, 10d) and is made of steel. The rolling component comprises a surface layer portion (50) that is a region up to 20 µm in depth from the surface. The rolling component is intended for use with hydrogen-utilizing equipment. The steel contains 0.70 mass percent or more and 1.10 mass percent or less of carbon, 0.15 mass percent or more and 0.35 mass percent or less of silicon, 0.30 mass percent or more and 0.60 mass percent or less of manganese, 1.30 mass percent or more and 1.60 mass percent or less of chromium, 0.01 mass percent or more and 0.50 mass percent or less of molybdenum, and 0.01 mass percent or more and 0.50 mass percent or less of vanadium, with a balance consisting of iron and unavoidable impurities. In the surface layer portion, the steel has a nitrogen concentration of 0.2 mass percent or more.

    HEAT TREATMENT METHOD OF BEARING RING
    3.
    发明公开
    HEAT TREATMENT METHOD OF BEARING RING 审中-公开

    公开(公告)号：EP4361294A1

    公开(公告)日：2024-05-01

    申请号：EP23202567.6

    申请日：2023-10-10

    申请人： Aktiebolaget SKF

    发明人： Song, Yunfeng ,  Pan, Yunfei ,  Qian, Weihua

    IPC分类号： C21D1/10 ,  C21D1/25 ,  C21D6/00 ,  C21D8/00 ,  C21D9/40 ,  C22C38/00 ,  C21D1/60

    CPC分类号： C21D9/40 ,  C21D8/005 ,  C21D6/00 ,  C21D1/25 ,  C21D1/10 ,  C22C38/00 ,  C21D6/002 ,  C21D1/60

    摘要： The invention discloses a heat treatment method for a bearing ring, the method comprising the following steps: the first step: performing induction heating and liquid spraying on the bearing ring, so that a radially outer portion and/or a radially inner portion of the bearing ring is hardened, and a radially middle portion is hardened; the second step: performing induction heating on a radially side surface which one of the two hardened portions or the hardened portion in the first step is adjacent to, so that the temperature at the corresponding surface reaches 820°C-950°C, while performing liquid spraying on the other radially side surface opposite to said side surface, so that the temperature of the entirety of the other radially side surface does not exceed 150°C, and, for the region subjected to the induction heating treatment, performing liquid spraying treatment after the induction heating treatment, so that the bearing ring forms a hardened radially outer portion, a hardened radially inner portion, and a radially middle portion with a reduced hardness; the third step: performing low-temperature tempering on the bearing ring. The heat treatment method of the present invention can increase fatigue life, reduce manufacturing energy consumption, and reduce manufacturing cost.

    ROLLING BEARING
    5.
    发明公开
    ROLLING BEARING 审中-公开

    公开(公告)号：EP4332248A1

    公开(公告)日：2024-03-06

    申请号：EP22795684.4

    申请日：2022-04-22

    申请人： NTN Corporation

    发明人： AKAHORI, Masato ,  MIWA, Noriaki ,  SATO, Miyu ,  YAMADA, Masahiro

    IPC分类号： C21D9/40 ,  F16C19/02 ,  F16C33/62 ,  C22C38/00 ,  C22C38/24 ,  C21D1/06 ,  C23C8/26

    摘要： A rolling bearing (100) includes a plurality of balls (30) and two raceway members (10, 20). The balls and the raceway members have contact surfaces. In at least either of balls and raceway members, a superficial part (50) is formed in a region from the contact surface to a depth of 20 µm. Of the balls and the raceway members, the member in which a superficial part is formed in the contact surface is made of steel that has been quenched. A raceway surface (10aa, 20aa) which is a contact surface of the raceway member is a partial arc in a sectional view that passes a central axis (A) of the rolling bearing and is parallel with the central axis. The diameter of the partial arc is greater than or equal to 1.01 times and less than or equal to 1.08 times the diameter of the ball.