公开(公告)号：US20240310354A1

公开(公告)日：2024-09-19

申请号：US18565298

申请日：2023-06-02

申请人： NSK LTD.

发明人： Takenobu INABA ,  Keisuke YOKOYAMA ,  Shunsuke IWASE

IPC分类号： G01N33/28 ,  G01N1/38 ,  G01N21/25 ,  G06T7/00 ,  G06T7/90

CPC分类号： G01N33/2888 ,  G01N1/38 ,  G01N21/255 ,  G06T7/0002 ,  G06T7/90 ,  G06T2207/10024

摘要： Provided is a grease deterioration detecting method which can detect deterioration of grease and in which the amount of grease necessary for detecting deterioration is small. The grease deterioration detecting method includes a dilution step of diluting grease with a diluent to obtain diluted grease, and a measurement step of measuring a color of the diluted grease with a sensor.

公开(公告)号：US20230384252A1

公开(公告)日：2023-11-30

申请号：US18246914

申请日：2021-09-24

申请人： NSK LTD.

发明人： Shunsuke IWASE ,  Taisuke MARUYAMA

IPC分类号： G01N27/22

CPC分类号： G01N27/221 ,  G01N27/228

摘要： A condition diagnosis method includes: a measurement step of measuring relative dielectric constant of a lubricant by applying a voltage to the lubricant while changing a frequency from an AC power source; a derivation step of deriving parameters indicating electrical properties of the lubricant by applying the relative dielectric constant measured in the measurement step to a theoretical formula; and a diagnosis step of diagnosing a condition of the lubricant using the parameters.

公开(公告)号：US20230408435A1

公开(公告)日：2023-12-21

申请号：US18246990

申请日：2021-09-24

申请人： NSK LTD.

发明人： Shunsuke IWASE ,  Taisuke MARUYAMA

IPC分类号： G01N27/22

CPC分类号： G01N27/221 ,  F16C33/6688

摘要： There is provided a state detection method for detecting an oil film state according to a lubricant in a device configured to lubricate a plurality of parts with the lubricant, the method including: a measurement step of measuring impedance and a phase angle of an electric circuit by applying an AC voltage to the electric circuit configured with the plurality of parts while changing a frequency; and a derivation step of deriving an oil film thickness according to the lubricant and a parameter indicating an electrical characteristic according to the oil film thickness, based on a relative dielectric constant at a high frequency limit of the lubricant defined based on a composition of the lubricant, and the impedance and the phase angle measured in the measurement step.

公开(公告)号：US20230366750A1

公开(公告)日：2023-11-16

申请号：US18247046

申请日：2021-09-24

申请人： NSK LTD.

发明人： Shunsuke IWASE ,  Taisuke MARUYAMA

IPC分类号： G01K11/00 ,  G01K13/02

CPC分类号： G01K11/00 ,  G01K13/026

摘要： Provided is a temperature derivation method for deriving an oil film temperature of a lubricant in a device, the temperature derivation method including a measurement step of measuring a dielectric constant of the lubricant by applying an alternating voltage while changing a frequency to an electric circuit configured by the device, a derivation step of 5 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 of calculating the oil film temperature by using the relaxation time.