公开(公告)号：US11708854B2

公开(公告)日：2023-07-25

申请号：US17425484

申请日：2020-02-20

Applicant: NTN Corporation

Inventor： Masato Yoshino ,  Kazuyoshi Harada

IPC: F16C17/04 ,  F01D25/16 ,  F02C7/06 ,  F16C27/02 ,  F16C17/10

CPC classification number: F16C17/042 ,  F01D25/168 ,  F02C7/06 ,  F16C17/10 ,  F16C27/02 ,  F05D2220/30 ,  F05D2240/52 ,  F16C2360/23

Abstract: A thrust foil bearing 40 having a thrust bearing surface S formed by arranging a plurality of leaves 42 side by side in a circumferential direction, in which each of the leaves 42 has a top foil portion Tf that forms the thrust bearing surface S, and a ratio of a circumferential length A of the top foil portion Tf of one of the leaves 42 at a radially central position of the top foil portion Tf, to a radial length B from an inner diameter-side edge 423 to an outer diameter-side edge 424 of the top foil portion Tf is 0.66 or less.

公开(公告)号：US11519459B2

公开(公告)日：2022-12-06

申请号：US16767285

申请日：2018-12-07

Applicant: NTN CORPORATION

Inventor： Kazuyoshi Harada ,  Shinji Komatsubara ,  Shouhei Oka ,  Jun Hirade

IPC: F16C17/02 ,  F16C17/08 ,  F16C33/74

Abstract: A fluid dynamic bearing device 1 includes: a shaft member 2; a bearing sleeve 8 that has the shaft member 2 inserted into the inner periphery thereof; a housing 7 that holds the bearing sleeve 8 on the inner periphery thereof and has a bottomed cylindrical shape having an opening at an end portion on one axial side; and a seal member 9 provided at the opening of the housing 7. The seal member 9 has a disk portion 9a disposed on one axial side of the bearing sleeve 8, and a protrusion (cylindrical portion 9b) protruding to the other axial side from an outer diameter end of the disk portion 9a. An outer peripheral surface 9c of the seal member 9 is fixed to an inner peripheral surface 7a1 of the housing 7.

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：US11719126B2

公开(公告)日：2023-08-08

申请号：US17434804

申请日：2020-02-26

Applicant: NTN Corporation

Inventor： Kazuyoshi Harada ,  Masato Yoshino ,  Miki Okamoto

IPC: F01D25/16 ,  F02C6/12 ,  F16C17/04

CPC classification number: F01D25/168 ,  F02C6/12 ,  F16C17/042 ,  F05D2220/40 ,  F05D2240/52 ,  F16C2360/24

Abstract: Each of foils (22) includes: a top foil portion (22a) including a bearing surface (S); and a back foil portion (22b), which is formed on an upstream side of the top foil portion (22a), and is arranged so as to overlap behind the top foil portion (22a) of the adjacent foil (22) (on a side opposite to the bearing surface (S)). An angle (E) covering a radially inner end of an overlapping portion (P) between the adjacent foils (22) is smaller than an angle (D) covering a radially outer end of the overlapping portion (P).