Title:
TEMPERATURE DERIVATION METHOD FOR OIL FILM, TEMPERATURE DERIVATION DEVICE, AND PROGRAM
Document Type and Number:
WIPO Patent Application WO/2022/071163
Kind Code:
A1
Abstract:
This temperature derivation method for deriving the oil film temperature of a lubricant inside a device comprises: a measurement step for measuring the dielectric constant of the lubricant by applying an alternating-current voltage, while changing the frequency, to an electric circuit formed by the device; a derivation step for applying the dielectric constant measured in the measurement step to a theoretical formula to derive a relaxation time of the lubricant; and a calculation step for using the relaxation time to calculate the oil film temperature.
Inventors:
IWASE SHUNSUKE (JP)
MARUYAMA TAISUKE (JP)
MARUYAMA TAISUKE (JP)
Application Number:
PCT/JP2021/035205
Publication Date:
April 07, 2022
Filing Date:
September 24, 2021
Export Citation:
Assignee:
NSK LTD (JP)
International Classes:
G01M13/04; G01K1/14; G01K7/34
Domestic Patent References:
| WO2017188314A1 | 2017-11-02 | |||
| WO2020149233A1 | 2020-07-23 |
Foreign References:
| JP2012052941A | 2012-03-15 | |||
| US5788376A | 1998-08-04 | |||
| US20110265569A1 | 2011-11-03 | |||
| JP2019211317A | 2019-12-12 | |||
| JP2020163962A | 2020-10-08 | |||
| JP2021137563A | 2021-09-16 |
Other References:
See also references of EP 4224136A4
Attorney, Agent or Firm:
EIKOH PATENT FIRM, P.C. (JP)
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