JPWO2023176602A5

JPWO2023176602A5 -

Info

Publication number: JPWO2023176602A5
Application number: JP2023538109A
Authority: JP
Filing date: 2023-03-07
Publication date: 2024-02-22
Anticipated expiration: 2043-03-07

Claims

A detection method for detecting the state of a bearing device including a plain bearing,
Applying an alternating current voltage to an electric circuit composed of the sliding bearing and the rotating shaft,
measuring the impedance and phase angle of the electric circuit when the alternating current voltage is applied;
Based on the impedance and the phase angle, derive the oil film thickness and metal contact ratio between the sliding bearing and the rotating shaft,
The oil film thickness and the metal contact ratio are derived using a calculation formula corresponding to an electric circuit formed by a line contact that occurs between the sliding bearing and the rotating shaft within the bearing device. A detection method characterized by:

An electric circuit configured by the line contact includes a resistance caused by the line contact, a first capacitor configured by a lubricant located within a predetermined range from the line contact, and a lubricant located outside the predetermined range. 2. The detection method according to claim 1, further comprising a second capacitor made of an agent.

The capacitance _C1 of the first capacitor is

ε: Dielectric constant of lubricant α: Fracture rate of oil film (metal contact ratio) (0≦α<1)
a: Contact width in the short direction of the rotating shaft L: Length of the rotating shaft h ₁ : Indicated by the oil film thickness in the Hertzian contact area,
The capacitance C2 of the second capacitor is

3. The detection method according to claim 2, wherein r: the radius of the roller piece.

The calculation formula for deriving the oil film thickness _h1 and the metal contact ratio α is as follows:

|Z|: Impedance in dynamic contact state |Z ₀ |: Impedance in static contact state θ: Phase angle in dynamic contact state θ ₀ : Phase angle in static contact state ε: Dielectric constant of lubricant α: Oil film Fracture rate (metal contact ratio) (0≦α<1)
a: contact width in the short direction of the rotating shaft L: length of the rotating shaft h ₁ : oil film thickness in the Hertzian contact area r: radius of the roller piece ω: angular frequency of the alternating voltage. Detection method according to 2 .

5. The detection method according to claim 1, further comprising diagnosing the bearing device using the oil film thickness and the metal contact ratio.

A detection device for detecting the state of a bearing device including a sliding bearing,
Acquisition means for acquiring the impedance and phase angle of the electric circuit when the AC voltage is applied, which are obtained when an AC voltage is applied to the electric circuit constituted by the sliding bearing and the rotating shaft;
Deriving means for deriving an oil film thickness and metal contact ratio between the sliding bearing and the rotating shaft based on the impedance and the phase angle;
has
The deriving means calculates the oil film thickness and the metal contact ratio using a calculation formula corresponding to an electric circuit formed by a line contact occurring between the sliding bearing and the rotating shaft in the bearing device. A detection device characterized in that the detection device uses

computer,
Obtaining the impedance and phase angle of the electrical circuit when the alternating current voltage is applied, which are obtained when an alternating current voltage is applied to an electric circuit consisting of the plain bearing and the rotating shaft for a bearing device including a plain bearing. acquisition means,
Derivation means for deriving an oil film thickness and metal contact ratio between the sliding bearing and the rotating shaft based on the impedance and the phase angle;
function as
The deriving means calculates the oil film thickness and the metal contact ratio using a calculation formula corresponding to an electric circuit formed by a line contact occurring between the sliding bearing and the rotating shaft in the bearing device. A program characterized in that it is derived using

A detection method for detecting the state of a bearing device including an outer member, an inner member, and a plurality of rollers, the method comprising:
applying an alternating current voltage to an electric circuit made up of the outer member, the inner member, and the plurality of rollers while applying a predetermined radial load to the bearing device;
measuring the impedance and phase angle of the electric circuit when the alternating current voltage is applied;
Based on the impedance and the phase angle, derive an oil film thickness and a metal contact ratio between at least one of the inner member and the plurality of rollers, or between the inner member and the plurality of rollers,
The oil film thickness and the metal contact ratio are derived using calculation formulas corresponding to electric circuits configured in each of a loaded zone and a non-load zone within the bearing device specified by the predetermined radial load. detection method.

The calculation formula for deriving the oil film thickness h and the metal contact ratio α is as follows:

n: Total number of rolling elements in the bearing n ₁ : Number of rolling elements located in the load area b￣: Average contact width of rolling elements L: Length of rolling elements R _tx : Effective radius of rolling elements S _t1 : Average contact area S _i1 (m): Contact area between rolling element m and inner ring S _o1 (m): Contact area between rolling element m and outer ring ω: Angular frequency of AC voltage ε: Dielectric constant of lubricant k : Number of bearings Ψ: Dimensionless constant h _gap : Radial gap m: Natural number indicating rolling elements located in non-load area (1≦m≦(n-n1))
|Z ₀ |: impedance in static contact state θ ₀ : phase in static contact state |Z|: impedance in dynamic contact state θ: phase in dynamic contact state Detection method.

10. The detection method according to claim 8, further comprising diagnosing the bearing device using the oil film thickness and the metal contact ratio.

A detection device for detecting the state of a bearing device including an outer member, an inner member, and a plurality of rollers, the detection device comprising:
The alternating current voltage obtained when an alternating current voltage is applied to an electric circuit composed of the outer member, the inner member, and the plurality of rollers with a predetermined radial load applied to the bearing device. acquisition means for acquiring the impedance and phase angle of the electric circuit when applied;
Deriving an oil film thickness and metal contact ratio between at least one of the inner member and the plurality of rollers or between the inner member and the plurality of rollers based on the impedance and the phase angle. means and
has
The deriving means calculates the oil film thickness and the metal contact ratio using calculation formulas corresponding to electric circuits configured in each of a loaded zone and a non-load zone within the bearing device specified by the predetermined radial load. A detection device characterized by deriving .

computer,
When a predetermined radial load is applied to a bearing device that includes an outer member, an inner member, and a plurality of rollers, the bearing device that includes the outer member, the inner member, and the plurality of rollers acquisition means for acquiring the impedance and phase angle of the electric circuit when the AC voltage is applied, which are obtained when the AC voltage is applied to the electric circuit;
Deriving an oil film thickness and metal contact ratio between at least one of the inner member and the plurality of rollers or between the inner member and the plurality of rollers based on the impedance and the phase angle. means,
function as
The deriving means calculates the oil film thickness and the metal contact ratio using calculation formulas corresponding to electric circuits configured in each of a loaded zone and a non-load zone within the bearing device specified by the predetermined radial load. A program to derive .