Title:
STATE DIAGNOSIS METHOD, STATE DIAGNOSIS DEVICE, AND PROGRAM
Document Type and Number:
WIPO Patent Application WO/2022/071162
Kind Code:
A1
Abstract:
This state diagnosis method comprises a measurement step for measuring relative permittivities of a lubricant by applying a voltage to the lubricant using an AC power supply while changing the frequency, a derivation step for deriving a parameter expressing an electrical characteristic of the lubricant by applying the relative permittivities measured in the measurement step to a theoretical formula, and a diagnosis step for using the parameter to diagnose the state of the lubricant.
Inventors:
IWASE SHUNSUKE (JP)
MARUYAMA TAISUKE (JP)
MARUYAMA TAISUKE (JP)
Application Number:
PCT/JP2021/035203
Publication Date:
April 07, 2022
Filing Date:
September 24, 2021
Export Citation:
Assignee:
NSK LTD (JP)
International Classes:
G01N33/30; G01N27/00; G01N27/02; G01N27/22
Domestic Patent References:
| WO2011065340A1 | 2011-06-03 | |||
| WO2014094813A1 | 2014-06-26 |
Foreign References:
| JP2009198341A | 2009-09-03 | |||
| JP2000338101A | 2000-12-08 | |||
| JP2017211329A | 2017-11-30 | |||
| JP2007192769A | 2007-08-02 | |||
| JP2008215901A | 2008-09-18 | |||
| JPH07239316A | 1995-09-12 | |||
| JP2020163961A | 2020-10-08 | |||
| JP2021137562A | 2021-09-16 |
Other References:
See also references of EP 4224160A4
Attorney, Agent or Firm:
EIKOH PATENT FIRM, P.C. (JP)
Download PDF: