Status detection device and sliding device

Abstract

To provide a state detection device and a sliding device capable of detecting a sliding state regarding whether wear of a wear member is underway.SOLUTION: A state detection device detects a state of a wear member having a sliding surface that slides against a conductive opposing member via an oil film, and has a chip body that has an apical surface disposed in the same relative position as the sliding surface relative to the opposing member and has a main surface that is connected to the tip surface and extends in a direction separated from the opposing member, and a state detection chip having a wiring pattern formed on the main surface. The wiring pattern has a sliding detection circuit having a pair of sliding detection wires extending mutually independently in a direction separated from the opposing member with the apical surface as a starting point, and further includes a first resistance measurement part for measuring electric resistance between the pair of sliding detection wires and a processor having a first determination part for determining whether a value of electric resistance measured by the first resistance measurement part goes lower than a first predetermined threshold.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a condition detection device and a sliding device. [Background technology]

[0002] It is known to provide an electric wear sensor to detect wear on the sliding parts of industrial machinery (see, for example, Patent Document 1). The electric wear sensor has a substrate with a wiring pattern and detects wear on the sliding part by detecting breaks in the wiring pattern. Furthermore, this wear sensor can measure the amount of wear on the wear members that make up the sliding part from breaks in the wiring pattern. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-148774 Summary of the Invention [Problem to be solved by the invention]

[0004] However, although the wear sensor described in Patent Document 1 can measure the amount of wear of the wear member, it cannot detect the sliding state of the wear member, i.e., whether or not wear of the wear member is in progress.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a state detection device and a sliding device that can detect the sliding state, indicating whether or not wear of a wear member is progressing. [Means for solving the problem]

[0006] In order to solve the above problems, a condition detection device according to the present disclosure is a condition detection device for a wear member having a sliding surface that slides against a conductive opposing member via an oil film, and includes: a chip body having a tip surface that is arranged in the same relative position as the sliding surface with respect to the opposing member and has a main surface that is connected to the tip surface and extends in a direction away from the opposing member; and a condition detection chip having a wiring pattern formed on the main surface, wherein the wiring pattern has a sliding detection circuit having a pair of sliding detection wires that extend independently from each other in a direction away from the opposing member, starting from the tip surface; and further includes a processing device having a first resistance measurement unit that measures the electrical resistance between the pair of sliding detection wires; and a first determination unit that determines whether the value of the electrical resistance measured by the first resistance measurement unit is below a predetermined first threshold. The wiring pattern further includes a wear detection circuit having a pair of wear detection wires that start at a position farther away from the opposing member than the tip surface and extend further away from the opposing member, and a connecting wire that connects the starting points of the pair of wear detection wires, and further includes a second resistance measurement unit that detects the electrical resistance between the pair of wear detection wires, and the processing device further includes a second judgment unit that judges whether the value of electrical resistance detected by the second resistance measurement unit exceeds a predetermined second threshold value, and a wear amount measurement unit that measures the amount of wear of the wear member based on the position of the connecting wire when the second judgment unit judges that the value of electrical resistance measured by the second resistance measurement unit exceeds the second threshold value.

[0007] A sliding device according to the present disclosure includes the above-described condition detection device, the opposing member, and the wear member. [Effects of the Invention]

[0008] According to the state detection device and sliding device of the present disclosure, it is possible to detect the sliding state, i.e., whether or not wear of the wear member is in progress. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a diagram showing a configuration of a sliding device according to a first embodiment of the present disclosure. [Figure 2] FIG. 2 is a diagram showing a wear member according to the first embodiment of the present disclosure in an advanced wear state. [Figure 3] FIG. 2 is a functional block diagram showing the configuration of a control device according to the first embodiment of the present disclosure. [Figure 4] 4 is a flowchart showing the procedure of a method for detecting a sliding state using the state detection device according to the first embodiment of the present disclosure. [Figure 5] 3 is a flowchart showing the procedure of a method for measuring wear amount using a condition detection device according to the first embodiment of the present disclosure. [Figure 6]FIG. 10 is a diagram showing the configuration of a sliding device according to a second embodiment of the present disclosure. [Figure 7] FIG. 2 is a hardware configuration diagram illustrating the configuration of a computer according to each embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0010] First Embodiment (Sliding device) A sliding device 1 according to a first embodiment of the present disclosure will be described below with reference to Figs. 1 to 5. The sliding device 1 is installed in a sliding portion of industrial machinery. The sliding device 1 includes a rotating shaft 2 as an example of an opposing member, a bearing 3 as an example of a wear member, and a condition detection device 5. The opposing member slides relative to the wear member while at least a portion of the opposing member is in contact with the wear member.

[0011] (rotation axis) As shown in FIGS. 1 and 2, the rotary shaft 2 is formed in a cylindrical shape extending in one direction. Hereinafter, the radial direction of the rotary shaft 2 may be simply referred to as the "radial direction." The rotating shaft 2 is made of a conductive metal material.

[0012] (bearings) The bearing 3 is a journal bearing that supports the rotating shaft 2 rotatably around a rotation axis O that is along the central axis of the rotating shaft 2. The inner peripheral surface of the bearing 3 is a sliding surface 3a that slides against the rotating shaft 2 via an oil film 4.

[0013] (Storage section) The bearing 3 is provided with a receiving portion 3b. The receiving portion 3b is a hole that penetrates the bearing 3 in the radial direction. The receiving portion 3b extends so as to open on the rotating shaft 2 side.

[0014] (Status detection device) The condition detection device 5 is provided to detect the sliding condition to determine whether or not wear is progressing in the bearing 3. The condition detection device 5 includes a condition detection chip 10, a first resistance measurement unit 6, a second resistance measurement unit 7, and a processing device 20.

[0015] (Status detection chip) The condition detection chip 10 is accommodated in the accommodation portion 3b of the bearing 3. The condition detection chip 10 has a chip body 11 and a wiring pattern 12.

[0016] (chip body) The chip body 11 is an insulating substrate made of a resin material or the like. The chip body 11 extends in the extension direction of the housing portion 3b. The chip body 11 has a tip surface 13 and a main surface 14. The tip surface 13 is disposed in the same relative position with respect to the outer circumferential surface of the rotating shaft 2 as the sliding surface 3a of the bearing 3. In other words, the distance between the tip surface 13 and the outer circumferential surface of the rotating shaft 2 is equal to the distance between the sliding surface 3a and the outer circumferential surface of the rotating shaft 2. The main surface 14 is connected to the tip surface 13 and extends in a direction away from the outer circumferential surface of the rotating shaft 2.

[0017] (wiring pattern) The wiring pattern 12 is formed on the main surface 14 of the chip body 11. The wiring pattern 12 is made of a metal material such as copper. The wiring pattern 12 includes a sliding detection circuit 15 and a wear detection circuit 16.

[0018] (Slide detection circuit) The sliding detection circuit 15 has a pair of sliding detection wires 17 . A pair of sliding detection wires 17 is provided on chip body 11. The pair of sliding detection wires 17 extend independently from each other, starting from tip surface 13 of chip body 11 in a direction away from rotation shaft 2. Of both ends of sliding detection wire 17, the first resistance measuring unit 6 is electrically connected to the end opposite tip surface 13 of chip body 11.

[0019] When the rotating shaft 2 and the bearing 3 slide with the oil film 4 interposed therebetween, the pair of sliding detection wires 17 are insulated. Therefore, the electrical resistance between the pair of sliding detection wires 17 approaches infinity. However, if the oil film 4 between the rotating shaft 2 and bearing 3 disappears and the rotating shaft 2 and bearing 3 slide in contact with each other, the bearing 3 will wear out due to the rotation of the rotating shaft 2. When the bearing 3 is in this sliding state, the ends of the pair of sliding detection wires 17 come into contact with the rotating shaft 2. This makes the pair of sliding detection wires 17 conductive, and the electrical resistance between the pair of sliding detection wires 17 becomes close to zero. In this way, when the oil film 4 between the rotating shaft 2 and bearing 3 disappears and the rotating shaft 2 enters a sliding state where wear is progressing, the electrical resistance between the pair of sliding detection wires 17 drops sharply.

[0020] (Wear detection circuit) The wear detection circuit 16 has a pair of wear detection wires 18 and a connection wire 19 . A pair of wear detection wires 18 is provided on the chip body 11. The pair of wear detection wires 18 originates at a position farther away from the opposing member than the tip surface 13 of the chip body 11 and extends in a direction further away from the opposing member. The pair of wear detection wires 18 extend independently of each other. Each wear detection wire 18 is formed so as not to be electrically connected to the sliding detection wire 17. Of both ends of the wear detection wire 18, the end opposite the tip surface 13 of the chip body 11 is electrically connected to the second resistance measurement unit 7.

[0021] The starting points of the pair of wear detection wires 18 are electrically connected by connection wires 19. This provides electrical continuity between the pair of wear detection wires 18. Therefore, the electrical resistance between the pair of wear detection wires 18 is close to zero. However, as wear of the bearing 3 progresses due to sliding against the rotating shaft 2, the connecting wire 19 breaks, and the pair of wear detection wires 18 are insulated. In this case, the electrical resistance between the pair of wear detection wires 18 approaches infinity. In this way, as wear of the bearing 3 progresses and the connecting wire 19 breaks, the electrical resistance between the pair of wear detection wires 18 increases rapidly.

[0022] (First resistance measurement section) The first resistance measuring unit 6 is used to measure the electrical resistance between the pair of sliding detection wires 17 and detect the above-mentioned sudden decrease in electrical resistance. The first resistance measuring unit 6 is electrically connected to a processing device 20.

[0023] (Second resistance measurement section) The second resistance measuring unit 7 is used to measure the electrical resistance between the pair of wear detection wires 18 and detect the above-mentioned sudden increase in electrical resistance. The second resistance measuring unit 7 is electrically connected to a processing device 20.

[0024] (Processing device) The processing device 20 processes the signals output from the first resistance measuring unit 6 and the second resistance measuring unit 7. The processing device 20 includes a control device 21, a first notification unit 22, and a second notification unit 23.

[0025] (Control device) The control device 21 is electrically connected to the first resistance measurement unit 6 and the second resistance measurement unit 7. The control device 21 controls the first notification unit 22 and the second notification unit 23 based on the measurement results of the first resistance measurement unit 6 and the second resistance measurement unit 7. As shown in FIG. 3 , the control device 21 has a first determination unit 24, a second determination unit 25, and a wear amount measurement unit 26.

[0026] (First Judgment Department) The first determination unit 24 is electrically connected to the first resistance measuring unit 6. The first determination unit 24 determines whether the electrical resistance between the pair of sliding detection wires 17 measured by the first resistance measuring unit 6 has fallen below a first threshold value. The first threshold value is an electrical resistance value that is set in advance in the first determination unit 24. The first threshold value is a value that indicates that the pair of sliding detection wires 17 is in a conductive state. The first determination unit 24 is electrically connected to the first notification unit 22 (see FIG. 1 ).

[0027] (Second Judgment Department) The second determination unit 25 is electrically connected to the second resistance measurement unit 7. The second determination unit 25 determines whether the electrical resistance between the pair of wear detection wires 18 measured by the second resistance measurement unit 7 exceeds a second threshold value. The second threshold value is an electrical resistance value that is set in advance in the second determination unit 25. The second threshold value is a value that indicates that the pair of wear detection wires 18 are in an insulated state. The second determination unit 25 is electrically connected to a wear amount measurement unit 26.

[0028] (Wear measurement section) When the second determination unit 25 determines that the value of the electrical resistance measured by the second resistance measurement unit 7 exceeds the second threshold value, the wear amount measurement unit 26 measures the amount of wear of the bearing 3 based on the position of the connection wiring 19. The wear amount measurement unit 26 is electrically connected to the first notification unit 22 (see FIG. 1).

[0029] (First Notification Department) When the first determination unit 24 determines that the resistance value has fallen below the first threshold value, the first notification unit 22 notifies that the bearing 3 has entered an advanced wear state. The first notification unit 22 is, for example, a buzzer that notifies those around by sound.

[0030] (Second Notification Department) When the second determination unit 25 determines that the wear amount exceeds the second threshold, the second notification unit 23 notifies the wear amount of the bearing 3. The second notification unit 23 is, for example, a monitor that displays the wear amount.

[0031] (Method for detecting sliding state) The procedure for detecting the sliding state using the state detection device 5 to determine whether or not the bearing 3 is wearing out will be described below with reference to the flowchart shown in Fig. 4. It is assumed that the sliding state shown in Fig. 1, in which the rotating shaft 2 and bearing 3 slide against each other via an oil film 4, changes to the sliding state shown in Fig. 2, in which the rotating shaft 2 and bearing 3 slide in contact with each other without the oil film 4 interposed therebetween. The method for detecting the sliding state includes a first resistance measurement step S11, a first determination step S12, and a first notification step S13.

[0032] In the first resistance measurement step S11, the first resistance measurement unit 6 measures the electrical resistance between the pair of sliding detection wires 17. The first resistance measurement unit 6 outputs a signal including information about the measured electrical resistance between the pair of sliding detection wires 17 to the first determination unit 24.

[0033] The first resistance measurement step S11 is followed by a first determination step S12. In the first determination step S12, the first determination unit 24 determines whether the electrical resistance between the pair of sliding detection wires 17 has fallen below a first threshold value. If the first determination unit 24 determines that the electrical resistance between the pair of sliding detection wires 17 is not below the first threshold value (first determination step S12; NO), the process proceeds to the first resistance measurement step S11. If the first determination unit 24 determines that the electrical resistance between the pair of sliding detection wires 17 is below the first threshold value (first determination step S12; YES), the first determination unit 24 outputs a signal to the first notification unit 22, and the process proceeds to a first notification step S13.

[0034] After the first determination step S12, a first notification step S13 is performed. In the first notification step S13, the first notification unit 22 notifies the surrounding area that the bearing 3 has entered an advanced wear state, based on a signal from the first determination unit 24. In this way, the detection of the sliding state as to whether or not the bearing 3 is undergoing wear is completed. Furthermore, the above-described detection of the sliding state of the bearing 3 to determine whether or not wear is progressing is repeatedly performed each time the rotating shaft 2 is driven to rotate.

[0035] (Method for measuring wear amount) The procedure for measuring the amount of wear of the bearing 3 using the condition detection device 5 will be described below with reference to the flowchart shown in Fig. 5. It is assumed that wear of the bearing 3, which is in the advanced wear state shown in Fig. 2, progresses and the pair of wear detection wires 18 changes from a conductive state to an insulated state. The method for measuring the amount of wear includes a second resistance measurement step S21, a second determination step S22, a wear amount measurement step S23, and a second notification step S24.

[0036] In the second resistance measurement step S21, the second resistance measurement unit 7 measures the electrical resistance between the pair of wear detection wirings 18. The second resistance measurement unit 7 outputs a signal including information about the measured electrical resistance between the pair of wear detection wirings 18 to the second determination unit 25.

[0037] The second resistance measurement step S21 is followed by a second determination step S22. In the second determination step S22, the second determination unit 25 determines whether the electrical resistance between the pair of wear detection wires 18 exceeds a second threshold value. If the second determination unit 25 determines that the electrical resistance between the pair of wear detection wires 18 does not exceed the second threshold value (second determination step S22; NO), the process proceeds to the second resistance measurement step S21. If the second determination unit 25 determines that the electrical resistance between the pair of wear detection wires 18 exceeds the second threshold value (second determination step S22; YES), the second determination unit 25 outputs a signal to the second notification unit 23, and the process proceeds to a wear amount measurement step S23.

[0038] After the second determination step S22, a wear amount measurement step S23 is performed. In the wear amount measurement step S23, the wear amount measurement unit 26 measures the wear amount of the bearing 3 based on the position of the connecting wiring 19. The wear amount measurement unit 26 outputs a signal including information on the wear amount of the bearing 3 to the wear amount measurement unit 26.

[0039] After the wear amount measuring step S23, a second notification step S24 is performed. In the second notification step S24, the second notification unit 23 notifies the surroundings of the amount of wear of the bearing 3 based on a signal from the wear amount measuring unit 26. In this way, the measurement of the amount of wear of the bearing 3 is completed.

[0040] (Action and effect) In this embodiment, the condition detection device 5 includes a processing device 20 having a first resistance measurement unit 6 that measures the electrical resistance between the pair of sliding detection wires 17 and a first determination unit 24 that determines whether the value of the electrical resistance measured by the first resistance measurement unit 6 is below a predetermined first threshold. This allows the electrical resistance between the pair of sliding detection wires 17 to be measured. The pair of sliding detection wires 17 extend independently of each other and are not electrically connected. Therefore, when wear is not progressing, the electrical resistance between the pair of sliding detection wires 17 is close to infinity. On the other hand, when wear is progressing in a sliding state, the pair of sliding detection wires 17 are electrically connected by an opposing conductive member, and the electrical resistance between the pair of sliding detection wires 17 is close to zero. Therefore, by determining whether the measured electrical resistance between the sliding detection wires 17 is below the first threshold, it is possible to detect whether the pair of sliding detection wires 17 are in a conductive state and thereby detect the sliding state, i.e., whether wear of the bearing 3 is progressing.

[0041] In this embodiment, the processing device 20 has a first notification unit 22 that notifies that the bearing 3 has entered an advanced wear state when the first determination unit 24 determines that the value of the electrical resistance measured by the first resistance measurement unit 6 has fallen below the first threshold value. This makes it possible to quickly notify the surrounding area that the bearing 3 has entered an advanced wear state.

[0042] In this embodiment, the condition detection device 5 includes a second resistance measurement unit 7 that detects the electrical resistance between the pair of wear detection wires 18. The processing device 20 includes a second determination unit 25 that determines whether the value of the electrical resistance detected by the second resistance measurement unit 7 exceeds a predetermined second threshold, and a wear amount measurement unit 26 that measures the amount of wear of the bearing 3 based on the position of the connection wire 19 when the second determination unit 25 determines that the value of the electrical resistance measured by the second resistance measurement unit 7 exceeds the second threshold. This allows the electrical resistance between the pair of wear detection wires 18 to be measured. The pair of wear detection wires 18 are electrically connected to each other by the connection wire 19. Therefore, the electrical resistance between the pair of wear detection wires 18 is close to zero. On the other hand, if wear of the condition detection chip 10 progresses to the connection wire 19 and a break occurs between the pair of wear detection wires 18, the electrical resistance between the pair of wear detection wires 18 will be close to infinity. Therefore, by determining that the measured electrical resistance between the pair of wear detection wires 18 exceeds the second threshold value, it can be determined that wear of the condition detection chip 10 has progressed to the connecting wires 19. Because wear of the condition detection chip 10 and wear of the bearing 3 progress simultaneously, the amount of wear of the bearing 3 can be measured based on the position of the connecting wires 19.

[0043] In this embodiment, the processing device 20 further includes a second notification unit 23 that notifies the wear amount of the bearing 3 when the second determination unit 25 determines that the value of the electrical resistance measured by the second resistance measurement unit 7 exceeds the second threshold value. This makes it possible to quickly notify the surrounding area of ​​the progress of wear of the bearing 3.

[0044] In this embodiment, the bearing 3 is provided with a housing portion 3b that houses the condition detection chip 10. This makes it possible to detect the sliding condition on the sliding surface 3a, i.e., whether or not the bearing 3 is undergoing wear. Therefore, it is possible to detect whether or not the oil film has separated between the rotating shaft 2 and the bearing 3. Furthermore, compared to when the status detection chip 10 is disposed at a position away from the rotation shaft 2, the slider 1 can be made smaller.

[0045] Second Embodiment A sliding device 1A according to a second embodiment of the present disclosure will be described below with reference to FIG. 6. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted where appropriate. In the second embodiment, the condition detection chip 10 is arranged alongside the bearing 3 along the rotation shaft 2. The condition detection chip 10 may be supported, for example, by a mounting member (not shown) provided separately from the bearing 3, or may be adhered to the outer circumferential surface of the bearing 3 with an adhesive or the like. This eliminates the need to process the bearing 3 in order to place the condition detection chip 10. Therefore, the condition detection chip 10 can be installed without changing the characteristics of the bearing 3.

[0046] FIG. 7 is a hardware configuration diagram showing the configuration of the computer 1100 according to each of the above-described embodiments. The computer 1100 includes a processor 1110 , a main memory 1120 , storage 1130 , and an interface 1140 .

[0047] The control device 21 of the processing device 20 described above is implemented in a computer 1100. The operations of the above-described processing units are stored in the form of a program in a storage 1130. The processor 1110 reads the program from the storage 1130, loads it into the main memory 1120, and executes the above-described processing in accordance with the program. The processor 1110 also allocates a storage area in the main memory 1120 in accordance with the program.

[0048] The program may be for realizing some of the functions to be performed by the computer 1100. For example, the program may be combined with other programs already stored in the storage 1130 or other programs implemented in other devices to perform the functions. Furthermore, the computer 1100 may include a custom LSI (Large Scale Integrated Circuit) such as a PLD (Programmable Logic Device) in addition to or instead of the above configuration. Examples of PLDs include PAL (Programmable Array Logic), GAL (Generic Array Logic), CPLD (Complex Programmable Logic Device), and FPGA (Field Programmable Gate Array). In this case, some or all of the functions to be performed by the processor 1110 may be realized by the integrated circuit.

[0049] Examples of storage 1130 include a magnetic disk, a magneto-optical disk, and a semiconductor memory. Storage 1130 may be an internal medium directly connected to the bus of computer 1100, or an external medium connected to computer 1100 via interface 1140 or a communication line. Furthermore, when this program is distributed to computer 1100 via a communication line, computer 1100 that has received the program may load the program into main memory 1120 and execute the above-described processing.

[0050] The program may also be for realizing part of the above-mentioned functions. Furthermore, the program may be a so-called differential file (differential program) that realizes the above-mentioned functions in combination with another program already stored in the storage 1130.

[0051] <Other embodiments> The above describes in detail the embodiments of the present disclosure with reference to the drawings, but the specific configuration is not limited to this embodiment, and design changes and the like are also included within the scope that does not deviate from the gist of the present disclosure. In the above embodiment, the rotating shaft 2 is given as an example of an opposing member, and the bearing 3 is given as an example of a wear member, but the present invention is not limited to this. For example, the wear sensor may be provided in a braking device of a railway vehicle. In this case, the wheels of the railway vehicle correspond to the opposing member, and the brake shoes that press the wheels against the road surface correspond to the wear member.

[0052] In the above embodiment, the wiring pattern 12 has been described as having the sliding detection circuit 15 and the wear detection circuit 16, but this is not limiting. For example, the wiring pattern 12 may be provided with the sliding detection circuit 15, but may not be provided with the wear detection circuit 16.

[0053] In the above embodiment, the sliding detection circuit 15 has been described as having one pair of sliding detection wires 17, but the present invention is not limited to this. For example, the sliding detection circuit 15 may have multiple pairs of sliding detection wires 17. In this case, it is possible to detect whether or not the multiple pairs of sliding detection wires 17 are in a conductive state. Therefore, it is possible to more reliably detect the sliding state, i.e., whether or not wear of the bearing 3 is progressing, thereby improving detection accuracy.

[0054] In the above embodiment, the wear detection circuit 16 has been described as having one pair of wear detection wires 18, but the present invention is not limited to this. For example, the wear detection circuit 16 may have multiple pairs of wear detection wires 18 and multiple connection wires 19. In this case, by arranging the multiple connection wires 19 in a staggered manner so that the distances from the rotating shaft 2 are different, it is possible to stagger the timing at which each connection wire 19 breaks. This makes it possible to measure the amount of wear of the bearing 3 in stages.

[0055] In the above embodiment, the first notification unit 22 is a buzzer, but the present invention is not limited to this and may be, for example, a lamp that notifies by light.

[0056] In the above embodiment, the second notification unit 23 is a monitor, but the present invention is not limited to this. For example, the second notification unit 23 may be an audio player that notifies the wear amount by audio.

[0057] In the above embodiment, the housing portion 3b is a hole that penetrates the bearing 3 in the radial direction, but the present invention is not limited to this. The housing portion 3b may be an insertion groove formed in a surface of the bearing 3 that intersects with the sliding surface 3a.

[0058] <Additional Notes> The state detection device 5 and the sliding device 1, 1A described in each embodiment can be understood, for example, as follows.

[0059] (1) A condition detection device 5 according to a first aspect is a condition detection device 5 for a wear member having a sliding surface 3 a that slides against a conductive opposing member via an oil film 4, and includes: a chip body 11 having a tip surface 13 that is arranged in the same relative position as the sliding surface 3 a with respect to the opposing member and a main surface 14 that is connected to the tip surface 13 and extends in a direction away from the opposing member; and a condition detection chip 10 having a wiring pattern 12 formed on the main surface 14, wherein the wiring pattern 12 has a sliding detection circuit 15 having a pair of sliding detection wires 17 that start at the tip surface 13 and extend independently from each other in a direction away from the opposing member, and further includes a first resistance measurement unit 6 that measures the electrical resistance between the pair of sliding detection wires 17; and a processing device 20 having a first determination unit 24 that determines whether the value of the electrical resistance measured by the first resistance measurement unit 6 is below a predetermined first threshold value. Examples of the opposing member include the rotating shaft 2 and the wheels of a railway vehicle. Examples of wear members include bearings 3 and brake shoes used in braking devices for railway vehicles.

[0060] This makes it possible to measure the electrical resistance between the pair of sliding detection wires 17. When wear is in progress, the pair of sliding detection wires 17 are electrically connected to each other by an opposing conductive member, and therefore the electrical resistance between the pair of sliding detection wires 17 has a value close to zero. Therefore, by determining whether the measured electrical resistance between the sliding detection wires 17 is below the first threshold value, it is possible to detect the sliding state, i.e., whether or not wear of the wear member is in progress.

[0061] (2) A condition detection device 5 according to a second aspect is the condition detection device 5 of (1), and the processing device 20 may further include a first notification unit 22 that notifies that the wear component has entered an advanced wear state when the first determination unit 24 determines that the value of the electrical resistance measured by the first resistance measurement unit 6 has fallen below the first threshold value.

[0062] This makes it possible to quickly notify the surrounding area that the wear member has reached an advanced wear state.

[0063] (3) A condition detection device 5 according to a third aspect is the condition detection device 5 of (1) or (2), wherein the wiring pattern 12 further includes a wear detection circuit 16 having a pair of wear detection wires 18 that start at a position farther away from the opposing member than the tip surface 13 and extend further away from the opposing member, and a connecting wire 19 that connects the start points of the pair of wear detection wires 18, and further includes a second resistance measurement unit 7 that detects the electrical resistance between the pair of wear detection wires 18, and the processing device 20 may further include a second determination unit 25 that determines whether the value of the electrical resistance detected by the second resistance measurement unit 7 exceeds a predetermined second threshold value, and a wear amount measurement unit 26 that measures the amount of wear of the wear member based on the position of the connecting wires 19 when the second determination unit 25 determines that the value of the electrical resistance measured by the second resistance measurement unit 7 exceeds the second threshold value.

[0064] This makes it possible to measure the electrical resistance between the pair of wear detection wires 18. When wear of the condition detection chip 10 progresses to the connecting wires 19 and a break occurs between the pair of wear detection wires 18, the electrical resistance between the pair of wear detection wires 18 approaches infinity. Therefore, by determining that the measured electrical resistance between the pair of wear detection wires 18 exceeds the second threshold value, it can be determined that wear of the condition detection chip 10 has progressed to the connecting wires 19. The amount of wear of the wear member can be measured based on the position of the connecting wires 19.

[0065] (4) A fourth aspect of the condition detection device 5 is the condition detection device 5 of (3), and the processing device 20 may further include a second notification unit 23 that notifies the wear amount of the wear member when the second judgment unit 25 determines that the value of the electrical resistance measured by the second resistance measurement unit 7 exceeds the second threshold value.

[0066] This allows the amount of wear of the wear member to be quickly notified to those around.

[0067] (5) A sliding device 1, 1A according to a fifth aspect includes the state detection device 5 according to any one of (1) to (4), the opposing member, and the wear member.

[0068] (6) The sliding device 1 according to a sixth aspect is the sliding device 1 of (5), wherein the wear member may be provided with a housing portion 3b in which the condition detection chip 10 is housed.

[0069] This makes it possible to detect the sliding state on the sliding surface 3a, i.e., whether or not the wear member is wearing out, and therefore whether or not the oil film is separated between the opposing member and the wear member.

[0070] (7) A sliding device 1A according to a seventh aspect is the sliding device 1A of (5), in which the condition detection chip 10 may be arranged alongside the wear member along the opposing member.

[0071] This eliminates the need to process the wear member in order to place the condition detection chip 10. Therefore, the condition detection chip 10 can be installed without changing the characteristics of the wear member. [Explanation of symbols]

[0072] DESCRIPTION OF SYMBOLS 1,1A...Sliding device 2...Rotating shaft 3...Bearing 3a...Sliding surface 3b...Containing section 4...Oil film 5...Condition detection device 6...First resistance measurement section 7...Second resistance measurement section 10...Condition detection chip 11...Chip body 12...Wiring pattern 13...Tip surface 14...Main surface 15...Sliding detection circuit 16...Wear detection circuit 17...Sliding detection wiring 18...Wear detection wiring 19...Connection wiring 20...Processing device 21...Control device 22...First notification section 23...Second notification section 24...First judgment section 25...Second judgment section 26...Wear amount measurement section 1100...Computer 1110...Processor 1120...Main memory 1130...Storage 1140...Interface S11...First resistance measurement process S12...First judgment process S13...First notification process S21...Second resistance measurement process S22...Second judgment process S23: Wear amount measurement process S24: Second notification process O: Rotation axis

Claims

1. A state detection device for a wear member having a sliding surface that slides against a conductive opposing member via an oil film, a chip body having a tip surface that is disposed at the same relative position as the sliding surface with respect to the opposing member and a main surface that is connected to the tip surface and extends in a direction away from the opposing member; and a status detection chip having a wiring pattern formed on the main surface, The wiring pattern is a slide detection circuit having a pair of slide detection wires extending independently from each other in a direction away from the opposing member starting from the tip end surface, a first resistance measuring unit that measures the electrical resistance between the pair of sliding detection wirings; a processing device having a first determination unit that determines whether the value of the electrical resistance measured by the first resistance measurement unit is below a predetermined first threshold; Furthermore, The wiring pattern is a wear detection circuit including a pair of wear detection wires extending from a position farther away from the opposing member than the tip end surface as a starting point in a direction further away from the opposing member, and a connection wire connecting the starting points of the pair of wear detection wires, Further, a second resistance measurement unit is provided to detect the electrical resistance between the pair of wear detection wirings. The processing device includes: a second determination unit that determines whether the value of the electrical resistance detected by the second resistance measurement unit exceeds a predetermined second threshold value; a wear amount measuring unit that measures the wear amount of the wear member based on the position of the connecting wiring when the second determination unit determines that the value of the electrical resistance measured by the second resistance measuring unit exceeds the second threshold value; and The condition detection device further comprises:

2. The processing device includes: The condition detection device described in claim 1, further comprising a first notification unit that notifies that the wear member has entered a state of progressive wear when the first judgment unit determines that the value of the electrical resistance measured by the first resistance measuring unit has fallen below the first threshold value.

3. The processing device includes:

3. The condition detection device according to claim 1, further comprising a second notification unit that notifies the wear amount of the wear member when the second judgment unit determines that the value of the electrical resistance measured by the second resistance measurement unit exceeds the second threshold value.

4. The status detection device according to any one of claims 1 to 3; The opposing member; the wear member; A sliding device comprising:

5. 5. The sliding device according to claim 4, wherein the wear member is provided with a housing portion for housing the condition detection chip.

6. 5. The sliding device according to claim 4, wherein the condition detection chip is arranged alongside the wear member along the opposing member.

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