公开(公告)号：US10099287B2

公开(公告)日：2018-10-16

申请号：US15528599

申请日：2015-10-29

Applicant: NTN CORPORATION

Inventor： Tetsuya Kurimura

IPC: B22F3/00 ,  F16C33/14 ,  F16C33/10 ,  F16C17/10 ,  B22F3/03 ,  H02K5/16

Abstract: Dynamic pressure bearing (10), including: a green compact (10′), as a base material, of raw material powder including metal powder capable of forming an oxide coating; and dynamic pressure generating portions (A1 and A2) formed through die molding on an inner peripheral surface (8a) forming a radial bearing gap with an outer peripheral surface (2a1) of a shaft to be supported, that is, a shaft member (2). An oxide coating (11) is formed between particles of the metal powder by subjecting the green compact (10′) to steam treatment, and the dynamic pressure bearing (10) has a radial crushing strength of 150 MPa or more.

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：US20140050427A1

公开(公告)日：2014-02-20

申请号：US14062273

申请日：2013-10-24

Applicant: NTN CORPORATION

Inventor： Fuminori Satoji ,  Toshiyuki Mizutani ,  Tetsuya Yamamoto ,  Isao Komori ,  Tetsuya Kurimura

IPC: F16C33/72 ,  F16C32/06

CPC classification number: F16C33/723 ,  F16C17/107 ,  F16C32/0633 ,  F16C33/745 ,  F16C43/02 ,  F16C2370/12

Abstract: A fluid dynamic bearing device (21) includes: a shaft member (22); a housing (29) as an outer member which is arranged on a radially outer side of the shaft member (22) and is opened at both ends; a radial bearing gap which is formed on a radially inner side of the housing (29) and faces an outer peripheral surface of the shaft member (22); and a lid member (30) closing an opening on one end side of the housing (29), wherein the lid member (30) is fitted to an outer peripheral surface of the housing (29) with a fastening allowance which does not affect accuracy of a surface defining an outer diameter dimension of the radial bearing gap so that the housing (29) and the lid member (30) are bonded and fixed to each other.

Abstract translation: 流体动力轴承装置（21）包括：轴构件（22）; 作为外部构件的壳体（29），其布置在所述轴构件（22）的径向外侧上并且在两端开口; 径向轴承间隙，其形成在所述壳体（29）的径向内侧并且面向所述轴构件（22）的外周面; 以及盖构件（30），其封闭所述壳体（29）的一端侧的开口，其中，所述盖构件（30）以不影响精度的紧固余量装配到所述壳体（29）的外周面 限定径向轴承间隙的外径尺寸的表面，使得壳体（29）和盖构件（30）彼此结合并固定。

公开(公告)号：US10030696B2

公开(公告)日：2018-07-24

申请号：US15506349

申请日：2015-08-25

Applicant: NTN CORPORATION

Inventor： Shinji Komatsubara ,  Tetsuya Kurimura ,  Yasuhiro Yamamoto

IPC: F16C17/02 ,  F16C33/10 ,  F16C33/12 ,  H02K5/16 ,  H02K7/08

Abstract: A ratio W1/W2 of a circumferential width W1 of each of inclined hill portions G2 of a radial dynamic pressure generating portion G and a circumferential width W2 of each of inclined groove portions G3 is 1.2 or larger. And when an inner diameter of a bearing member is D, the circumferential width W2 of each of the inclined groove portions satisfies 0.2D≤W2≤0.4D.

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：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。