Lubricant supply control method, lubricant supply control device, and program

Abstract

In a supply control method for supplying a lubricant to a device having a structure for lubricating a plurality of sites with the lubricant, an impedance of a circuit configured from the plurality of sites is measured by applying an AC voltage to the circuit, and the lubricant is supplied to the device on the basis of the measured impedance. And a control unit that derives the thickness of the oil film and the fracture rate of the oil film between the plurality of regions, and controls at least one of the supply amount and the supply timing of the lubricant supplied to the device on the basis of the derived thickness of the oil film and the fracture rate of the oil film so that the lubrication state between the plurality of regions becomes a predetermined lubrication state.

Description

Technical Field

[0001] The present invention relates to a lubricant supply control method, a lubricant supply control device, and a program. Background Art

[0002] In the past, in bearing devices, a structure that uses a lubricant (e.g., lubricating oil, grease) to lubricate its rotation has been widely used. The lubricant is gradually consumed and deteriorated due to the operation of the bearing device, so in order to stably drive the bearing device and prevent damage to the bearing device, the lubricant must be properly supplied.

[0003] The timing and amount of lubricant supply are affected by the state of the bearing device at a certain moment. For example, Patent Document 1 discloses a structure for controlling the timing of grease replenishment to the bearing based on the rotation speed of the shaft and the cumulative value of time. In addition, Patent Document 2 discloses a structure using a DC power supply device in a method for monitoring the oil film state of the bearing device.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2004-76938

[0007] Patent Document 2: Japanese Patent Application Publication No. 2008-304037 Summary of the invention

[0008] Technical problem that the invention aims to solve

[0009] For example, in the method of Patent Document 1, since the oil film state is not directly measured, there is a possibility that the amount of lubricant supplied may be excessive or insufficient. Therefore, in order to achieve more stable operation of the bearing device, a control method for lubricant supply with higher accuracy is required. In addition, when the lubricant is supplied in excess, the torque related to the operation of the bearing device will increase, which will hinder the low torque of the device. In addition, the result of excessive lubricant supply is that useless lubricant consumption will occur.

[0010] In view of the above problems, an object of the present invention is to provide a lubricant supply control method capable of achieving low torque in a device using a lubricant and suppressing wasteful consumption of the lubricant.

[0011] Technical solutions to the problem

[0012] In order to solve the above-mentioned problems, the present invention has the following structure. That is, it is a supply control method for supplying the lubricant to a device having a structure for lubricating multiple parts with the lubricant, the method comprising:

[0013] a measuring step of measuring the impedance of the circuit by applying an alternating voltage to the circuit formed by the plurality of the parts;

[0014] a deriving step of deriving the oil film thickness and the oil film rupture rate between the plurality of the locations based on the impedance measured in the measuring step; and

[0015] The control step controls at least one of the supply amount or supply timing of the lubricant supplied to the device based on the oil film thickness and the oil film rupture rate derived in the derivation step, so that the lubrication state between the plurality of parts becomes a predetermined lubrication state.

[0016] In addition, another aspect of the present invention has the following structure. That is, it is a supply control device for supplying the lubricant to a device having a structure for lubricating multiple parts with the lubricant, and the device has:

[0017] a measuring unit for measuring the impedance of the circuit by applying an AC voltage to the circuit formed by the plurality of the parts;

[0018] a deriving unit configured to derive the oil film thickness and the oil film rupture rate between the plurality of the portions based on the impedance measured by the measuring unit; and

[0019] A control unit controls at least one of the supply amount or supply timing of the lubricant supplied to the device based on the oil film thickness and the oil film rupture rate derived by the derivation unit, so that the lubrication state between the plurality of parts becomes a specified lubrication state.

[0020] In addition, another embodiment of the present invention has the following structure. That is, it is a program that causes a computer to execute the following steps:

[0021] a measuring step of measuring the impedance of a circuit by applying an AC voltage to a circuit composed of a plurality of locations lubricated by a lubricant in the device;

[0022] a deriving step of deriving the oil film thickness and the oil film rupture rate between the plurality of the locations based on the impedance measured in the measuring step; and

[0023] The control step controls at least one of the supply amount or supply timing of the lubricant supplied to the device based on the oil film thickness and the oil film rupture rate derived in the derivation step, so that the lubrication state between the plurality of parts becomes a predetermined lubrication state.

[0024] Effects of the Invention

[0025] According to the present invention, it is possible to supply lubricant which can achieve a lower torque in a device using lubricant and suppress wasteful consumption of lubricant. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram showing an example of a device configuration according to an embodiment of the present invention.

[0027] Figure 2 This is a graph for explaining measurement results according to one embodiment of the present invention.

[0028] Figure 3 This is a flowchart of lubricant supply control according to one embodiment of the present invention. DETAILED DESCRIPTION

[0029] Hereinafter, specific embodiments will be described with reference to the accompanying drawings and the like. In addition, the embodiments described below are used to illustrate one embodiment of the present invention and are not intended to limit the interpretation of the present invention. In addition, all structures described in each embodiment are not limited to structures necessary to solve the problems of the present invention. In addition, in each of the drawings, the same constituent elements are indicated by marking the same reference numerals to indicate the corresponding relationship.

[0030] <First Embodiment>

[0031] The first embodiment of the present invention is described below. In addition, in the following description, a ball bearing is used as an example of a rolling bearing provided by a bearing device, but it is not limited to this. The present invention can also be applied to devices of other structures that can utilize lubricants and can appropriately supply lubricants from the outside. For example, as types of rolling bearings to which the present invention can be applied, deep groove ball bearings, angular contact ball bearings, tapered roller bearings, cylindrical roller bearings, self-aligning roller bearings, etc. can be cited. Moreover, the present invention can also be applied to other rolling devices, such as spindles, etc.

[0032] [Device structure]

[0033] Figure 1 1 is a schematic structural diagram showing an example of the overall structure of a system 1 capable of executing the lubricant supply control involved in the present embodiment. The system 1 is configured to include: a control device 100, a state detection device 200, a rolling device 300, and a lubricant supply device 400. The control device 100 controls the state detection device 200, the rolling device 300, and the lubricant supply device 400, or obtains various information from each device.

[0034] The state detection device 200 monitors the state of the rolling device 300 and detects changes in its state, etc., according to the instructions of the control device 100. In this embodiment, the state detection device 200 detects the thickness of the oil film of the lubricant of the rolling device 300, whether the oil film is broken, etc., by an electrical method (more specifically, an electrical impedance method (EIM)). In addition, the state detection device 200 may also include a temperature sensor for detecting the temperature of the rolling device 300, or other sensors.

[0035] The rolling device 300 includes a rolling bearing (not shown) such as a ball bearing, and rotates based on the instruction of the control device 100. The lubricant supply device 400 supplies lubricant to a predetermined portion of the rolling device 300 based on the instruction of the control device 100. The lubricant supply device 400 may be configured to include a syringe pump, for example.

[0036] The control device 100 includes: a state detection device control unit 101, a rolling device control unit 102, a supply device control unit 103, a state monitoring unit 104, a state notification unit 105, and a history information management unit 106. The state detection device control unit 101 causes the state detection device 200 to monitor the state of the rolling device 300 and obtains the detection result. The rolling device control unit 102 drives a motor (not shown) to rotate or stop the rotating shaft (not shown) of the rolling device 300, thereby controlling the operation of the rolling device 300. The supply device control unit 103 causes the lubricant supply device 400 to supply lubricant according to the state of the lubricant in the rolling device 300.

[0037] The state monitoring unit 104 monitors the state of the scrolling device 300 based on various detection results obtained via the state detection device control unit 101. The state notification unit 105 notifies the user of the results monitored by the state monitoring unit 104, the control results of each device, etc. The notification method here is not particularly limited, and the notification may be displayed on the screen via the display unit, or may be made by sound, etc. The history information management unit 106 records and manages the results monitored by the state monitoring unit 104, the control results of each device, etc. as history information.

[0038] The control device 100 can be realized, for example, by an information processing device including a control unit, a storage unit, and an output unit (not shown). The control unit can be composed of a CPU (Central Processing Unit), an MPU (MicroProcessing Unit), a DSP (Digital Single Processor), or a dedicated circuit. The storage unit is composed of volatile and non-volatile storage media such as HDD (Hard Disk Drive), ROM (Read Only Memory), and RAM (Random Access Memory), and can input and output various information according to instructions from the control unit. The output unit is composed of display devices such as speakers, lights, or liquid crystal displays, and outputs to the operator according to instructions from the control unit. In addition, the output unit can be a network interface with a communication function, and can also perform output actions by sending data to an external device (not shown) via a network (not shown).

[0039] In this embodiment, the control device 100 is shown as an example composed of a single device responsible for controlling the state detection device 200, the rolling device 300, and the lubricant supply device 400, but the present invention is not limited thereto. Alternatively, a structure may be provided in which separate control devices are provided for the state detection device 200, the rolling device 300, and the lubricant supply device 400 and they cooperate with each other.

[0040] In the rolling device 300, the rolling bearing supports the rotating shaft so that it can rotate freely. The rotating shaft is supported by the housing covering the outer side of the rotating shaft via the rolling bearing as a rotating part. The rolling bearing includes: an outer ring (outer part) as a fixed ring embedded in the housing, an inner ring (inner part) as a rotating ring embedded in the rotating shaft, a plurality of balls (rollers) as rolling elements arranged between the inner ring and the outer ring, and a retainer (not shown) that holds the rolling elements so that they can roll freely. Here, a structure in which the outer ring is fixed is set, but a structure in which the inner ring is fixed and the outer ring rotates can also be used. In addition, a seal can also be provided as a peripheral part for preventing garbage from invading the periphery of the rolling element and lubricating oil from leaking. Inside the rolling bearing, the friction between the inner ring and the rolling element, and between the outer ring and the rolling element can be reduced by a predetermined lubrication method. The lubrication method is not particularly limited, for example, grease lubrication, oil lubrication, etc. are used, and are appropriately supplied to the inside of the rolling bearing through the treatment described later. There is no particular limitation on the type of lubricant.

[0041] In addition, in the present embodiment, the rotating shaft of the rolling device 300 is connected to the LCR meter provided in the state detection device 200 via a rotary connector (not shown). The rotary connector can be formed using, for example, a carbon brush, but is not limited thereto. In addition, the rolling bearing of the rolling device 300 is also electrically connected to the LCR meter, and in this case, the LCR meter also functions as an AC power supply for the rolling bearing.

[0042] The state detection device control unit 101 of the control device 100 indicates the angular frequency ω and the AC voltage V of the AC power source as input to the LCR meter during state detection (state monitoring), and obtains the impedance Z and the phase angle θ of the rolling device 300 from the LCR meter as outputs relative thereto. Then, the state monitoring unit 104 of the control device 100 uses these values ​​to detect information related to the state of the lubricant in the rolling device 300. It should be noted that the specific detection method of the state of the lubricant used in the structure of this embodiment (for example, the thickness of the oil film of the lubricant, whether the oil film is broken, etc.) can use the method described in the Japanese Patent Gazette No. 7099551 of the present applicant, etc., but is not particularly limited.

[0043] [Example of lubrication status]

[0044] use Figure 2 An example of a lubrication state according to the present embodiment will be described. Figure 2 (a) is a graph showing the relationship between the oil film thickness h [m] and the lubricant supply rate q [μl / min] per unit time. Figure 2 (b) is a graph showing the relationship between the oil film breakage rate α [%] and the lubricant supply rate q [μl / min] per unit time. Figure 2 (c) is a graph showing the relationship between the torque M (N·mm) for rotating the rotating shaft of the rolling device 300 and the supply speed q (μl / min) of the lubricant per unit time. Figure 2 (a)~ Figure 2 The supply speed q [μl / min] on the horizontal axis of (c) corresponds to this.

[0045] It should be noted that the oil film thickness h, the oil film breakage rate α, and the like herein are results obtained based on a conventional electrical impedance method described in, for example, Japanese Patent No. 7099551.

[0046] Compare Figure 2 (a)~ Figure 2 (c) Explain. Figure 2 In (a), the dotted line h c Theoretical oil film thickness h represents the theoretical oil film thickness, which corresponds to a state in which no further lubrication can be achieved (hereinafter also referred to as the "first lubrication state").c For example, see Hamrock BJ and Dowson D. Isothermal elastohydrodynamic lubrication of point contacts: part III-fully flooded results. ASME Trans J Lubricat Technol 1977; 99: 264-275. It is assumed that lubricant is supplied to the rolling device 300 at a certain time. Figure 2 The supply speed q shown on the horizontal axis shows the supply speed indicating the lubricant supply amount per unit time.

[0047] like Figure 2 As shown at points 203 and 204 in (a), when lubricant is supplied, the oil film thickness h approaches the theoretical oil film thickness h. c In this case, if Figure 2 As shown in points 213 and 214 of (b), the oil film breakage rate α is 0, and the contact between the inner ring and the rolling element is suppressed, and the possibility of breakage is reduced. Figure 2 As shown in points 223 and 224 of (c), the torque M for rotating the rotating shaft of the rolling bearing becomes a high value. In this case, for example, the load of the motor increases and the efficiency decreases.

[0048] On the other hand, in Figure 2 When lubricant is not supplied (supply rate q is 0) as shown at point 201 in (a), the oil film thickness h decreases, and as a result, Figure 2 As shown at point 211 in (b), the oil film rupture rate α increases. In this case, for example, contact between the inner ring and the rolling element occurs, and the possibility of abnormalities such as rupture increases. In this case, due to friction caused by contact between the components, such as Figure 2 As shown by point 221 in (c), the torque M for rotating the rotating shaft may also increase.

[0049] In consideration of the above, in this embodiment, the oil film thickness h is smaller than the theoretical oil film thickness h and the rupture rate α is 0 or substantially 0. c The lubricant supply speed q is used to control the lubricant supply. Figure 2 The lubricant is supplied in a manner such that the oil film thickness h is in the state shown by point 202 of (a) (hereinafter also referred to as the "second lubrication state"). Figure 2 As shown in (b), the oil film rupture rate α is approximately 0. Figure 2 As shown at point 222 in (c), the torque M also becomes proportional to the theoretical oil film thickness h. cThe corresponding points 223 and 224 have lower values, and thus become lower values ​​than the point 221 where the contact between the components occurs.

[0050] In addition, here, although the case where the supply speed per unit time is adjusted is described as an example, the same control can be performed even when the supply amount is fixed and the supply frequency is adjusted.

[0051] [Processing Flow]

[0052] Figure 3 This is a flow chart of the lubricant supply control of this embodiment. This process is executed by the control device 100. For example, the control (not shown) provided by the control device 100 can be realized by reading and executing a program for realizing the process involved in this embodiment from a storage unit (not shown). This process flow is Figure 1 The various parts of the control device 100 shown perform processing in cooperation, but for simplicity of description, the processing subject is collectively described as the control device 100 here.

[0053] In S301 , the control device 100 starts to rotate the rolling device 300 . At this time, the control may be performed so that a fixed load (for example, an axial load) is applied. In addition, the control of applying the load may be performed by a device different from the control device 100 .

[0054] In S302, the control device 100 causes the state detection device 200 to detect the state of the rolling device 300 and obtain the detection result. As described above, the AC power supply of the LCR meter is used to apply the AC voltage V of the angular frequency ω to the rolling device 300, and as a result, the impedance information (complex impedance Z, phase angle θ, etc.) is obtained.

[0055] In S303, the control device 100 obtains the motion information of the rolling device 300 at that moment. The motion information may include, for example, the load applied to the rolling device 300, the rotation speed, the specifications of the rolling bearing constituting the rolling device 300, the temperature obtained by the temperature sensor, the type and characteristics of the lubricant, etc.

[0056] In S304 , the control device 100 uses an electrical impedance method such as the method described in Japanese Patent No. 7099551 to derive the lubrication state of the lubricant at that time (oil film thickness h, rupture rate α, etc.) based on the information acquired in S302 and S303 .

[0057] In S305, the control device 100 determines whether the oil film rupture is detected based on the rupture rate α derived in S304. The case where the oil film rupture is detected here may be, for example, a case where the rupture rate α is greater than a predetermined threshold value. The threshold value for the rupture rate α is predetermined and maintained in a storage unit, etc. In the case where the oil film rupture is detected (Yes in S305), the control device 100 proceeds to S308. On the other hand, in the case where the oil film rupture is not detected (No in S305), the control device 100 proceeds to S306.

[0058] In S306, the control device 100 determines whether it is in a state of excess lubrication, that is, the above-mentioned first lubrication state, based on the oil film thickness h derived in S304. The determination here can pre-set the range of oil film thickness corresponding to the above-mentioned second lubrication state, and be performed based on whether the derived oil film thickness h falls within the range. As described above, when the oil film thickness h exceeds the set range, although there is no problem with lubrication, the torque M becomes higher, which may hinder efficient operation. In the case of being in a state of excess lubrication (yes in S306), the control device 100 returns to S302 and repeats the process. At this time, the control device 100 may also continue the process of S302 after a fixed standby time (for example, 1 minute, 5 minutes, 10 minutes, etc.). In the case of being in a state of insufficient lubrication (no in S306), the control device 100 enters S307.

[0059] In S307, the control device 100 instructs the lubricant supply device 400 to supply lubricant to the rolling device 300, and performs lubricant supply control. In addition, in the supply control here, the supply amount may use a predetermined fixed supply amount, or may use a value that changes according to the comparison results with the threshold values ​​in S305 and S306. After the completion of this process, return to S302 and repeat the process. At this time, the control device 100 may also continue the process of S302 after a fixed standby time (for example, 1 minute, 5 minutes, 10 minutes, etc.). In addition, in this process, it is also possible to have a structure that adjusts the standby time here while using a fixed supply amount. For example, it is also possible to have a structure that extends the standby time when the oil film thickness h derived in S304 is close to the first lubrication state. That is, it is possible to adjust the standby time based on the derived oil film thickness h and the theoretical oil film thickness h. c The timing of the next measurement based on the electrical impedance method is controlled by the difference of . Thus, the frequency of unnecessary measurement and derivation processing can be suppressed according to the oil film thickness at a certain moment, and the processing load can be reduced.

[0060] In S308, the control device 100 performs control to stop the rotation of the rolling device 300. Although the supply of lubricant is controlled, if the breakage rate α of the oil film exceeds a predetermined threshold value, it may be configured to stop the rotation as if some abnormality exists.

[0061] In S309, the control device 100 notifies the user of stopping the rotation of the scrolling device 300 by a predetermined method, and then ends the present processing flow.

[0062] In addition, Figure 3 In the processing flow, the rolling device 300 is controlled to stop rotating based on the oil film rupture rate α, but the present invention is not limited thereto. In addition, for example, the rolling device 300 may be controlled to stop rotating when the lubricant cannot be supplied by the lubricant supply device 400 (for example, the lubricant that can be supplied is exhausted, the supply part is damaged, etc.).

[0063] In the above example, the lubricant supply control is performed using the oil film thickness h and the oil film breakage rate α, but the present invention is not limited to this. For example, the theoretical oil film thickness h may be used. c In this case, at least one of the lubricant supply amount and supply timing (supply frequency) may be controlled so that the oil film thickness ratio falls within a predetermined threshold value range.

[0064] As described above, according to this embodiment, it is possible to perform more accurate lubricant supply control, thereby preventing seizure and component damage caused by insufficient lubricant in the rolling device.

[0065] <Other Implementation Methods>

[0066] In addition, in the present invention, a program or application for implementing the functions of one or more of the above-mentioned embodiments can be supplied to a system or device using a network or storage medium, and one or more processors in a computer of the system or device read and execute the processing of the program to implement the functions.

[0067] In addition, it can also be realized by a circuit that realizes more than one function (for example, ASIC (Application Specific Integrated Circuit) or FPGA (Field Programmable Gate Array)).

[0068] Thus, the present invention is not limited to the above-mentioned embodiments, and combining the structures of the embodiments with each other, and changing and applying them by those skilled in the art based on the description in the specification and known technologies are also the intended contents of the present invention and are included in the scope of protection required.

[0069] As described above, the following matters are disclosed in this specification.

[0070] (1) A supply control method for a lubricant supplied to a device having a structure for lubricating a plurality of parts with the lubricant, characterized by comprising:

[0071] a measuring step of measuring the impedance of the circuit by applying an alternating voltage to the circuit formed by the plurality of the parts;

[0072] a deriving step of deriving the oil film thickness and the oil film rupture rate between the plurality of the locations based on the impedance measured in the measuring step; and

[0073] The control step controls at least one of the supply amount or supply timing of the lubricant supplied to the device based on the oil film thickness and the oil film rupture rate derived in the derivation step, so that the lubrication state between the plurality of parts becomes a predetermined lubrication state.

[0074] According to this configuration, it is possible to supply lubricant which can achieve a lower torque in a device using lubricant and suppress wasteful consumption of lubricant.

[0075] (2) The supply control method according to (1), characterized in that the prescribed lubrication state is a state in which the rupture rate of the oil film is 0 or substantially 0, and the oil film thickness is smaller than a theoretical oil film thickness between the plurality of the portions.

[0076] According to this configuration, it is possible to suppress the breakage of the oil film and to perform the lubricant supply control that can reduce the torque.

[0077] (3) The supply control method according to (2), characterized in that, in the control step, the measurement timing in the next measurement step is controlled based on the difference between the oil film thickness derived in the derivation step and the theoretical oil film thickness.

[0078] According to this configuration, the measurement timing can be controlled based on the oil film thickness, thereby reducing the processing load of the measurement.

[0079] (4) The supply control method according to any one of (1) to (3), characterized in that the device is a rolling device.

[0080] According to this configuration, it is possible to control the supply of lubricant to the rolling device.

[0081] (5) The supply control method according to any one of (1) to (3), characterized in that the device is a bearing device, and the plurality of parts include an outer member, an inner member, and a rolling element.

[0082] According to this configuration, it is possible to control the supply of lubricant around the rolling elements of the bearing device.

[0083] (6) A supply control device for supplying a lubricant to a device having a structure for lubricating a plurality of locations with the lubricant, characterized in that it comprises:

[0084] a measuring unit for measuring the impedance of the circuit by applying an AC voltage to the circuit formed by the plurality of the parts;

[0085] a deriving unit configured to derive the oil film thickness and the oil film rupture rate between the plurality of the portions based on the impedance measured by the measuring unit; and

[0086] A control unit controls at least one of the supply amount or supply timing of the lubricant supplied to the device based on the oil film thickness and the oil film rupture rate derived by the derivation unit, so that the lubrication state between the plurality of parts becomes a specified lubrication state.

[0087] According to this configuration, it is possible to supply lubricant which can achieve a lower torque in a device using lubricant and suppress wasteful consumption of lubricant.

[0088] (7) A program, characterized in that it causes a computer to execute the following steps:

[0089] a measuring step of measuring the impedance of a circuit by applying an AC voltage to a circuit composed of a plurality of locations lubricated by a lubricant in the device;

[0090] a deriving step of deriving the oil film thickness and the oil film rupture rate between the plurality of the locations based on the impedance measured in the measuring step; and

[0091] The control step controls at least one of the supply amount or supply timing of the lubricant supplied to the device based on the oil film thickness and the oil film rupture rate derived in the derivation step, so that the lubrication state between the plurality of parts becomes a predetermined lubrication state.

[0092] According to this configuration, it is possible to supply lubricant which can achieve a lower torque in a device using lubricant and suppress wasteful consumption of lubricant.

[0093] Above, various embodiments have been described, but the present invention is certainly not limited to this example. Those skilled in the art will appreciate that, within the scope of the claimed content, various modifications or amendments can be made, and these modifications or amendments certainly belong to the technical scope of the present invention. In addition, without departing from the scope of the gist of the present invention, the various constituent elements in the above-mentioned embodiments can be arbitrarily combined.

[0094] In addition, this application is an application based on the Japanese patent application (Japanese Patent Application No. 2022-109201) filed on July 6, 2022, and its contents are incorporated in this application as a reference.

[0095] Explanation of symbols

[0096] 1 System

[0097] 100 Control device

[0098] 101 Status detection device control unit

[0099] 102 Rolling device control unit

[0100] 103 Supply device control unit

[0101] 104 Status Monitoring Unit

[0102] 105 Status Notification Department

[0103] 106 Historical Information Management Department

[0104] 200 Status detection device

[0105] 300 Rolling device

[0106] 400 Lubricant supply device

Claims

1. A supply control method for supplying a lubricant to a device having a structure for lubricating a plurality of parts with the lubricant, characterized in that: include: a measuring step of measuring the impedance of the circuit by applying an alternating voltage to the circuit formed by the plurality of the parts; a deriving step of deriving the oil film thickness and the oil film rupture rate between the plurality of the locations based on the impedance measured in the measuring step; as well as The control step controls at least one of the supply amount or supply timing of the lubricant supplied to the device based on the oil film thickness and the oil film rupture rate derived in the derivation step, so that the lubrication state between the plurality of parts becomes a predetermined lubrication state.

2. The supply control method according to claim 1, characterized in that: The predetermined lubrication state is a state in which the breakage rate of the oil film is 0 or substantially 0, and the oil film thickness is smaller than a theoretical oil film thickness between the plurality of locations.

3. The supply control method according to claim 2, characterized in that: In the control step, a measurement timing in the next measurement step is controlled based on a difference between the oil film thickness derived in the deriving step and the theoretical oil film thickness.

4. The supply control method according to any one of claims 1 to 3, characterized in that: The device is a rolling device.

5. The supply control method according to any one of claims 1 to 3, characterized in that: The device is a bearing device, The plurality of parts include an outer member, an inner member and a rolling element.

6. A supply control device for supplying a lubricant to a device having a structure for lubricating a plurality of parts with the lubricant, characterized in that: have: a measuring unit for measuring the impedance of the circuit by applying an AC voltage to the circuit formed by the plurality of the parts; a deriving unit configured to derive the oil film thickness and the oil film rupture rate between the plurality of the portions based on the impedance measured by the measuring unit; as well as A control unit controls at least one of the supply amount or supply timing of the lubricant supplied to the device based on the oil film thickness and the oil film rupture rate derived by the derivation unit, so that the lubrication state between the plurality of parts becomes a specified lubrication state.

7. A program, characterized in that Make the computer execute the following process: a measuring step of measuring the impedance of a circuit by applying an AC voltage to a circuit composed of a plurality of locations lubricated by a lubricant in the device; a deriving step of deriving the oil film thickness and the oil film rupture rate between the plurality of the locations based on the impedance measured in the measuring step; as well as The control step controls at least one of the supply amount or supply timing of the lubricant supplied to the device based on the oil film thickness and the oil film rupture rate derived in the derivation step, so that the lubrication state between the plurality of parts becomes a predetermined lubrication state.

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