公开(公告)号：US11767488B2

公开(公告)日：2023-09-26

申请号：US16637129

申请日：2018-12-21

Applicant: NSK LTD.

Inventor： Taisuke Maruyama ,  Yujiro Toda ,  Eri Watabe ,  Suguru Sugawara ,  Masayuki Maeda

IPC: C10M169/06 ,  F16C33/66 ,  C10N40/02 ,  C10N50/10

CPC classification number: C10M169/06 ,  F16C33/6633 ,  C10M2205/0285 ,  C10M2207/126 ,  C10M2215/1026 ,  C10M2215/221 ,  C10M2219/068 ,  C10M2223/04 ,  C10M2290/04 ,  C10M2290/10 ,  C10N2040/02 ,  C10N2050/10 ,  C10M2207/125 ,  C10N2010/02 ,  C10M2207/125 ,  C10N2010/16 ,  C10M2207/125 ,  C10N2010/04

Abstract: The rolling bearing of the present invention is lubricated with a lubricant composition which contains a fatty acid metal salt, a metal dithiocarbamate, a phosphorous-type additive, and a basic additive, and which has a total acid value of 3.7 mgKOH/g or more. The rolling bearing makes it possible to further improve anti-fretting performance, and to reduce a decrease in fretting resistance even when used under the circumstance that fluorine-type grease penetrates into the bearing using urea-type grease.

公开(公告)号：US12013307B2

公开(公告)日：2024-06-18

申请号：US17422888

申请日：2020-01-10

Applicant: NSK LTD.

Inventor： Taisuke Maruyama ,  Masayuki Maeda ,  Ken Nakano

IPC: G01M13/04 ,  F16C19/06 ,  F16C19/52 ,  F16C19/54 ,  F16C33/66 ,  G01N27/22

CPC classification number: G01M13/04 ,  F16C19/06 ,  F16C19/522 ,  F16C19/546 ,  F16C33/66 ,  G01N27/221 ,  F16C2233/00 ,  F16C2237/00

Abstract: A method for diagnosing a rolling device (10) including an outer member (1), an inner member (3), and rolling elements (5) includes: applying an AC voltage to an electric circuit including the outer member (1), the rolling elements (5), and the inner member (3); measuring an impedance and a phase angle of the electric circuit when the AC voltage is applied; and measuring a dielectric constant of a lubricant at least one of between the outer member (1) and the rolling elements (5) and between the inner member (3) and the rolling elements (5) based on the measured impedance and the measured phase angle.

公开(公告)号：US10429373B2

公开(公告)日：2019-10-01

申请号：US16089869

申请日：2017-12-13

Applicant: NSK LTD.

Inventor： Masayuki Maeda ,  Taisuke Maruyama ,  Ken Nakano

IPC: G01R27/26 ,  G01N33/28 ,  G01N33/30 ,  G01N27/06 ,  G01M13/04 ,  G01N27/22

Abstract: A method is for diagnosing a rolling device comprising an outer member, an inner member, and a rolling element. The method includes applying an alternating voltage to an electric circuit configured by the outer member, the rolling element and the inner member, measuring an impedance and a phase of the electric circuit when the alternating voltage is applied to the electric circuit, and calculating a lubrication film thickness and a metallic contact ratio between the outer member and the rolling element and/or between the inner member and the rolling element, based on a measured impedance and a measured phase.

公开(公告)号：US10890575B2

公开(公告)日：2021-01-12

申请号：US16089742

申请日：2017-04-26

Applicant: NSK Ltd.

Inventor： Takenobu Inaba ,  Koichi Hachiya ,  Taisuke Maruyama

IPC: G01N33/28 ,  F16N29/00 ,  F16C19/06 ,  G01N33/00 ,  F16C19/52 ,  G01N33/30 ,  F16C33/66 ,  F16N29/04 ,  F01M11/10 ,  F16C41/00 ,  F16C19/54 ,  H01L35/32

Abstract: A lubricant deterioration detection device of the present invention includes a gas sensor that selectively detects a carbonyl compound. The gas sensor is configured to detect the carbonyl compound from at least one of formaldehyde, acetaldehyde, propanal, butanal, pentanal, n-hexanal, n-heptanal, formic acid, and acetic acid. The detection deterioration device further includes an oil removal portion that removes an oil mist generated from the lubricant.

公开(公告)号：US12196639B2

公开(公告)日：2025-01-14

申请号：US18245124

申请日：2021-05-31

Applicant: NSK LTD.

Inventor： Taisuke Maruyama ,  Suguru Sugawara ,  Masayuki Maeda

IPC: F16C19/52 ,  F16C33/66 ,  G01B7/06 ,  G01M13/04

Abstract: A detection method for detecting a state of a bearing device including an outer member, an inner member, and a plurality of rolling elements, the detection method including: applying an alternating current voltage to an electric circuit including the outer member, the rolling element, and the inner member while a predetermined load is applied to the bearing device; measuring an impedance and a phase angle of the electric circuit applied with the alternating current voltage; and deriving an oil film thickness and a metal contact ratio between the inner member and the plurality of rolling elements or between the inner member and at least one of the plurality of rolling elements based on the impedance and the phase angle.

公开(公告)号：US11643615B2

公开(公告)日：2023-05-09

申请号：US16637140

申请日：2018-12-21

Applicant: NSK LTD.

Inventor： Taisuke Maruyama ,  Yujiro Toda ,  Eri Watabe ,  Suguru Sugawara ,  Masayuki Maeda

IPC: C10M169/06 ,  C10M107/02 ,  C10M115/08 ,  C10M129/40 ,  C10M137/04 ,  C10M139/00 ,  C10M141/12 ,  C10N40/02

CPC classification number: C10M169/06 ,  C10M107/02 ,  C10M115/08 ,  C10M129/40 ,  C10M137/04 ,  C10M139/00 ,  C10M141/12 ,  C10M2205/0206 ,  C10M2207/126 ,  C10M2215/1026 ,  C10M2219/068 ,  C10M2223/04 ,  C10M2290/04 ,  C10M2290/10 ,  C10N2040/02

Abstract: A lubricant composition according to the present invention contains a fatty acid metal salt, a metal dithiocarbamate, and an additive having an effect of increasing an acid value of the lubricant composition, whereby fretting resistance performances are further improved.