公开(公告)号：US09976874B2

公开(公告)日：2018-05-22

申请号：US14904223

申请日：2014-07-02

Applicant: NTN CORPORATION

Inventor： Toru Takahashi ,  Tatsuo Nakajima ,  Hiroyuki Hakamata ,  Ikuo Uemoto ,  Shinji Miyazaki ,  Takuji Harano ,  Takayuki Oda

IPC: G01D5/14 ,  G01D5/244 ,  G01D5/245 ,  G01D5/246

CPC classification number: G01D5/14 ,  G01D5/24438 ,  G01D5/2452 ,  G01D5/246

Abstract: A magnetic encoder device (3) of the present invention includes a base portion (33) having a mounting surface (33b) for mounting to a rotary shaft (2), a cored bar (35) fitted and fixed over the base portion (33), and a double-row magnetic encoder track (30) formed on the cored bar (35). Through movement of each of magnetic poles of the magnetic encoder track (30) over a region opposed to a magnetic sensor (4), an angle of the rotating rotary shaft is detected. The base portion (33) is formed of a sintered metal, and the mounting surface (33b) is subjected to sizing.

公开(公告)号：US10600541B2

公开(公告)日：2020-03-24

申请号：US15785400

申请日：2017-10-16

Applicant: NTN CORPORATION

Inventor： Shinji Miyazaki ,  Takuji Harano ,  Tatsuo Nakajima

IPC: H01F7/02 ,  C22C38/00 ,  B23K35/36 ,  H01F1/057 ,  H01F41/02 ,  B22F3/02 ,  C22C33/02 ,  G01D5/14

Abstract: There is provided a compression-bonded magnet with a case, which can realize high magnetic properties, high corrosion resistance and high durability strength even at low cost. The compression-bonded magnet with a case is a compression-bonded magnet with a case 1, comprising: a compression-bonded magnet 2 comprising a rare earth magnet powder such as an isotropic Nd—Fe—B magnet powder and a resin binder of a thermosetting resin; a case 3 for inserting the compression-bonded magnet 2; and a sealing member 4, wherein the compression-bonded magnet 2 is formed by compression-molding a mixture comprising the rare earth magnet powder and the resin binder into a green compact and curing the resin binder contained in the green compact, the rare earth magnet powder is contained in a large amount with respect to the entire compression-bonded magnet (for example, in a volume ratio of 85% to 90%), the sealing member 4 is fixed at an insertion opening part 3a of the case 3, and the compression-bonded magnet 2 is hermetically sealed by the sealing member 4 and the case 3.

公开(公告)号：US09818521B2

公开(公告)日：2017-11-14

申请号：US15104224

申请日：2014-12-10

Applicant: NTN CORPORATION

Inventor： Shinji Miyazaki ,  Takuji Harano ,  Tatsuo Nakajima

IPC: H01F7/02 ,  C22C38/00 ,  B23K35/36 ,  B22F3/02 ,  C22C33/02 ,  H01F1/057 ,  H01F41/02 ,  G01D5/14

CPC classification number: H01F7/021 ,  B22F3/02 ,  B23K35/3613 ,  C22C33/02 ,  C22C38/00 ,  C22C2202/02 ,  G01D5/14 ,  G01D5/145 ,  H01F1/0576 ,  H01F1/0578 ,  H01F7/0221 ,  H01F41/026 ,  H01F41/0266

Abstract: There is provided a compression-bonded magnet with a case, which can realize high magnetic properties, high corrosion resistance and high durability strength even at low cost. The compression-bonded magnet with a case is a compression-bonded magnet with a case 1, comprising: a compression-bonded magnet 2 comprising a rare earth magnet powder such as an isotropic Nd—Fe—B magnet powder and a resin binder of a thermosetting resin; a case 3 for inserting the compression-bonded magnet 2; and a sealing member 4, wherein the compression-bonded magnet 2 is formed by compression-molding a mixture comprising the rare earth magnet powder and the resin binder into a green compact and curing the resin binder contained in the green compact, the rare earth magnet powder is contained in a large amount with respect to the entire compression-bonded magnet (for example, in a volume ratio of 85% to 90%), the sealing member 4 is fixed at an insertion opening part 3a of the case 3, and the compression-bonded magnet 2 is hermetically sealed by the sealing member 4 and the case 3.