Title:
OIL FILM STATE DETECTION METHOD, STATE DETECTION DEVICE, AND PROGRAM
Document Type and Number:
WIPO Patent Application WO/2022/071164
Kind Code:
A1
Abstract:
Disclosed is a state detection method for detecting a state of an oil film formed by a lubricant within a device configured such that the lubricant lubricates a plurality of sections, the method comprising: a measurement step for measuring an impedance and a phase angle of an electric circuit constituted by the plurality of sections by applying an alternating voltage to the electric circuit while varying the frequency; and a derivation step for deriving a thickness of the oil film formed by the lubricant and a parameter indicating an electric characteristic at said oil film thickness on the basis of a dielectric constant of the lubricant at a high-frequency limit and the impedance and the phase angle which have been measured.
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Inventors:
IWASE SHUNSUKE (JP)
MARUYAMA TAISUKE (JP)
MARUYAMA TAISUKE (JP)
Application Number:
PCT/JP2021/035206
Publication Date:
April 07, 2022
Filing Date:
September 24, 2021
Export Citation:
Assignee:
NSK LTD (JP)
International Classes:
F16C19/06; F16C19/52; F16C33/66; F16N29/00; G01M13/04; G01N27/02; G01N27/22
Foreign References:
| JP2009002693A | 2009-01-08 | |||
| JP2005308714A | 2005-11-04 | |||
| JP2019082448A | 2019-05-30 | |||
| JP2019211317A | 2019-12-12 | |||
| JP2007310611A | 2007-11-29 | |||
| JP2019211317A | 2019-12-12 | |||
| JP2020163963A | 2020-10-08 | |||
| JP2021137564A | 2021-09-16 |
Other References:
MARUYAMA TAISUKE, NAKANO KEN: "In Situ Quantification of Oil Film Formation and Breakdown in EHD Contacts", TRIBOLOGY TRANSACTIONS, THE SOCIETY, PARK RIDGE, IL,, US, vol. 61, no. 6, 2 November 2018 (2018-11-02), US , pages 1057 - 1066, XP055884681, ISSN: 1040-2004, DOI: 10.1080/10402004.2018.1468519
See also references of EP 4224026A4
See also references of EP 4224026A4
Attorney, Agent or Firm:
EIKOH PATENT FIRM, P.C. (JP)
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