公开(公告)号：US09989092B2

公开(公告)日：2018-06-05

申请号：US14899896

申请日：2014-06-25

Applicant: NTN CORPORATION

Inventor： Tetsuya Kurimura ,  Fuyuki Ito ,  Shinji Komatsubara ,  Tadahiro Uchiyama

IPC: F16C33/14 ,  B22F3/16 ,  H02K7/08 ,  C22C9/00 ,  F16C32/06 ,  F16C33/10 ,  B22F1/00 ,  B22F5/00 ,  C22C1/04 ,  F16C33/12 ,  C22C9/02 ,  F16C17/08 ,  F16C17/10

CPC classification number: F16C33/145 ,  B22F1/0003 ,  B22F1/0014 ,  B22F3/16 ,  B22F5/00 ,  B22F2301/10 ,  B22F2301/30 ,  B22F2301/35 ,  C22C1/0425 ,  C22C9/00 ,  C22C9/02 ,  F16C17/08 ,  F16C17/102 ,  F16C32/0633 ,  F16C33/104 ,  F16C33/128 ,  F16C2204/10 ,  F16C2370/12 ,  H02K7/08

Abstract: A sintered bearing includes a sintered metal formed by using a metal powder mixture containing copper powder and iron powder. The metal powder mixture contains 80 wt % or more of particles having an average particle diameter of less than 45 μm. The copper powder contains electrolytic copper powder. The electrolytic copper powder contains 40 number % or more of particles having a circularity of 0.64 or more.

公开(公告)号：US10145412B2

公开(公告)日：2018-12-04

申请号：US15100364

申请日：2014-12-05

Applicant: NTN CORPORATION

Inventor： Takao Arai ,  Fuyuki Ito ,  Mikihisa Fujiwara

IPC: H02K5/167 ,  F16C17/10 ,  F16C33/74

Abstract: Provided is a fluid dynamic bearing device (1), including: a bearing sleeve (8) made of sintered metal; a rotary member (2) including a shaft portion (21) and a hub portion (23); and first and second thrust bearing portions (T1, T2) that form thrust bearing gaps respectively on an upper end surface (8b) and a lower end surface (8c) of the bearing sleeve (8) along with rotation of the rotary member (2). At least an outer peripheral surface of the bearing sleeve (8) is subjected to pore sealing treatment. A sealing gap (S) for retaining an oil surface of lubricating oil is made along a tapered outer peripheral surface (8d1) of the bearing sleeve (8). A lid member (10) having a bottomed cylindrical shape being fixed to an outer periphery of a lower end of the bearing sleeve (8).

公开(公告)号：US11428266B2

公开(公告)日：2022-08-30

申请号：US16330432

申请日：2017-09-04

Applicant: NTN CORPORATION

Inventor： Takao Arai ,  Fuyuki Ito ,  Tetsuya Kurimura ,  Shinji Komatsubara ,  Katsuo Shibahara ,  Kazuyoshi Harada

IPC: F16C33/12 ,  B22F5/10 ,  B22F3/12 ,  B22F5/00 ,  F16C17/02 ,  F16C17/10 ,  H02K5/167 ,  B22F3/26

Abstract: Provided is a slide bearing (bearing sleeve (8)), comprising an oxidized green compact in which particles (11) of metal powder are bonded to each other by an oxide film (12) formed on surfaces of the particles (11). The oxidized green compact has a bearing surface (A, B) configured to slide, through intermediation of a lubricating film, relative to a mating member (shaft member (2)) to be supported. The bearing surface (A, B) has a large number of opening portions (13a), and the large number of opening portions (13a) and inner pores (13b) are interrupted in communication therebetween by the oxide film (12).

公开(公告)号：US10167899B2

公开(公告)日：2019-01-01

申请号：US15301019

申请日：2015-03-04

Applicant: NTN CORPORATION

Inventor： Fuyuki Ito

IPC: B22F3/00 ,  B22F3/02 ,  B22F3/10 ,  B22F3/17 ,  B22F3/24 ,  B22F5/10 ,  B22F7/00 ,  B22F7/06 ,  F16C17/02 ,  F16C17/10 ,  F16C33/10 ,  F16C33/12 ,  F16C33/14

Abstract: A sintered bearing (1) of the present invention includes: an inner layer (2) and an outer layer (3) each made of sintered metal and formed into a cylindrical shape; and a radial dynamic pressure generating portion (dynamic pressure grooves 1a1 and 1a2) die-formed in an inner peripheral surface of the inner layer (2), in which the outer layer (3) has compressive yield strength higher than compressive yield strength of the inner layer (2).

公开(公告)号：US20150043844A1

公开(公告)日：2015-02-12

申请号：US14385865

申请日：2013-03-18

Applicant: NTN CORPORATION

Inventor： Masaharu Hori ,  Hiroshi Akai ,  Tetsuya Kurimura ,  Fuyuki Ito

IPC: F16C32/06

Abstract: Provided is a sintered metal bearing, which is formed of raw material powder containing copper-based powder and iron-based powder as main components, the sintered metal bearing including a radial bearing surface along an inner periphery thereof. The copper-based powder includes fine copper powder exhibiting a particle size distribution in which a ratio of particles with a diameter of less than 45 μm is 80 wt % or more, the fine copper powder occupying one-third or more of a whole of the copper-based powder in terms of a weight ratio. A compressed body formed by compressing the raw material powder is sintered at 900° C. or more to 1,000° C. or less.

Abstract translation: 提供一种烧结金属轴承，其由含有铜基粉末和铁基粉末作为主要成分的原料粉末形成，该烧结金属轴承包括沿其内周的径向支承表面。 铜基粉末包括细小的铜粉末，其具有直径小于45μm的颗粒的比例为80重量％以上的粒度分布，占细粉末总数的三分之一以上的细铜粉末 铜基粉末的重量比。 通过压缩原料粉末形成的压缩体在900℃以上1000℃以下烧结。