公开(公告)号：US20160065015A1

公开(公告)日：2016-03-03

申请号：US14785168

申请日：2014-04-15

Applicant: NHK SPRING CO., LTD.

Inventor： Yohei KAMEDA ,  Kazuo IWATA ,  Yuji ARAOKA ,  Yoshiki ONO

IPC: H02K1/27 ,  H02K15/03

CPC classification number: H02K1/276 ,  H02K1/27 ,  H02K1/2766 ,  H02K15/03 ,  H02K29/03

Abstract: A magnet plate used for a rotor core of a motor, includes a magnetic pole portion being set between an outer peripheral edge of a body portion and a magnet slot and having a radial width being smaller than a radial sectional width of the permanent magnet, and a higher hardness portion being formed into a hook shape along an end corner of the magnet slot and have a smaller width than the radial sectional width of the permanent magnet.

Abstract translation: 用于电动机的转子铁芯的磁板包括设置在主体部分的外周边缘和磁体槽之间并具有小于永磁体的径向截面宽度的径向宽度的磁极部分，以及 较高的硬度部分沿着磁体槽的端角形成钩状并且具有比永磁体的径向截面宽度更小的宽度。

公开(公告)号：US20190390727A1

公开(公告)日：2019-12-26

申请号：US16559137

申请日：2019-09-03

Applicant: NHK SPRING CO., LTD.

Inventor： Takeshi SUZUKI ,  Yoshiki ONO ,  Shimpei KUROKAWA ,  Kosuke SHIBAIRI

IPC: F16F1/02 ,  C21D9/02

Abstract: A spring consists of, by mass %, 0.5 to 0.7% of C, 1.0 to 2.0% of Si, 0.1 to 1.0% of Mn, 0.1 to 1.0% of Cr, not more than 0.035% of P, not more than 0.035% of S, and the balance of Fe and inevitable impurities. The spring has a structure including not less than 65% of bainite and 4 to 13% of residual austenite by area ratio in a cross section. The spring has a compressive residual stress layer in a cross section from a surface to a depth of 0.35 mm to D/4, in which D (mm) is a circle-equivalent diameter of the cross section. The spring has a high hardness layer with greater hardness than a center portion by 50 to 500 HV from a surface to a depth of 0.05 to 0.3 mm.