Sliding bearing comprising pressure sensor

Abstract

The invention discloses a sliding bearing comprising a pressure sensor, the pressure sensor is further arranged on the outer surface of the sliding bearing in the radial direction, and the sliding bearing comprising the pressure sensor is used for monitoring the pressure of a sliding bearing of a wind power gear box. The pressure sensor is arranged on the outer surface of the sliding bearing in the radial direction, the pressure sensor comprises a plurality of stress monitoring parts, the stress monitoring parts are arranged in an array mode, and each stress monitoring part comprises a carbon material modified flexible sensor film. An installation groove corresponding to the pressure sensor is formed in the outer surface of the sliding bearing in the radial direction, and the pressure sensor is attached to the groove bottom of the installation groove and is flush with the outer surface of the sliding bearing. According to the sliding bearing, space limitation can be overcome, continuity and original tension of an oil film are guaranteed, and then real-time and effective oil film pressure detection is conducted on the matched working face of the pin shaft and the sliding bearing.

Description

Technical Field

[0001] The invention relates to a wind power main gearbox bearing system, and in particular to a sliding bearing comprising a pressure sensor. Background Art

[0002] At present, the oil film pressure detection of the wind turbine gearbox sliding bearing is usually carried out by drilling radial pressure guide holes along the radial direction of the pin at the detection position of the pin, and then drilling axial pressure guide holes along the axial direction of the pin. The axial pressure guide holes are connected to the radial pressure guide holes, so as to guide the oil film pressure to the end face of the pin. The oil film pressure can be detected by installing a pressure sensor at the end face. However, the above method has the following risks: if the radial pressure guide hole at the detection position is too large, the continuity of the oil film will be destroyed; if the radial pressure guide hole at the detection position is too small, the oil film pressure at the detection position cannot be transmitted to the pressure sensor on the end face of the pin in real time due to the tension of the oil in the hole. Therefore, there is an urgent need for a reliable and accurate method to measure the oil film pressure of the wind turbine gearbox sliding bearing. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the defect in the prior art that the oil film pressure of a sliding bearing cannot be accurately detected in real time, and to provide a sliding bearing including a pressure sensor.

[0004] The present invention solves the above technical problems through the following technical solutions:

[0005] A sliding bearing including a pressure sensor, wherein the outer surface of the sliding bearing in the radial direction is also provided with a pressure sensor, and the sliding bearing including the pressure sensor is used for monitoring the oil film pressure of the sliding bearing of a wind power gearbox, wherein the pressure sensor includes a plurality of stress monitoring parts, and the plurality of stress monitoring parts are arranged in an array, wherein the stress monitoring parts include a flexible sensor film modified by a carbon material, and an installation groove corresponding to the pressure sensor is opened on the outer surface of the sliding bearing in the radial direction, and the pressure sensor is attached to the bottom of the installation groove and is arranged flush with the outer surface of the sliding bearing in the radial direction.

[0006] In this scheme, a plurality of stress monitoring parts are arranged in an array to form a flexible pressure sensor, so that the pressure sensor can be arranged on the outer surface of the sliding bearing in the radial direction. Compared with the traditional pressure detection method in which a larger sensor is arranged at the end of the pin shaft and the oil film is guided out through the radial pressure guide hole and the axial pressure guide hole, it can overcome the space limitation to ensure the continuity and original tension of the oil film, and then perform real-time and effective oil film pressure detection on the surface of the sliding bearing facing the inner hole of the gear, that is, on the working surface. The stress monitoring part includes a flexible sensor film modified by carbon material. The sensitivity of the flexible sensor film after carbon modification can be increased by more than 50%, the signal recognition ability is improved, and the complexity and cost of the subsequent amplification circuit and signal processing circuit are reduced. In addition, the modification of carbon material can also improve the material's high temperature resistance, impact resistance, frequency response bandwidth and sensor range. The pressure sensor is accommodated by the mounting groove, so that it does not need to occupy additional space in the radial direction of the sliding bearing, which ensures the feasibility of pressure monitoring in the radial direction of the sliding bearing.

[0007] Preferably, the flexible sensor film comprises a polyvinylidene fluoride piezoelectric film, the flexible sensor film is modified with a carbon material, and the carbon material used for carbon modification of the flexible sensor film comprises at least one of carbon nanotubes, graphene and carbon quantum dots.

[0008] In this solution, the above-mentioned setting is used to achieve carbon material modification of the flexible sensor film.

[0009] Preferably, the stress monitoring part further comprises electrodes, and the electrodes are arranged on opposite sides of the flexible sensor film;

[0010] A packaging film, wherein the packaging film is arranged on a side of the electrode away from the flexible sensor film;

[0011] A lead pad is electrically connected to the electrodes at two opposite sides respectively, and the lead pad is located between the electrodes and the packaging film.

[0012] In this solution, a complete stress monitoring unit is formed through the above arrangement, so as to transmit the generated electrical signal to the acquisition system when the piezoelectric film is deformed by the oil film pressure.

[0013] Preferably, the size of the packaging film is larger than the size of the electrode, the size of the electrode is larger than the size of the lead pad, and the size of the electrode is the same as the size of the flexible sensor film.

[0014] In this solution, through the above arrangement, the packaging film can effectively package the flexible sensor film, the electrodes and the lead plate, and prevent other structures from being larger than the packaging film and extending out of the stress monitoring part.

[0015] Preferably, the stress monitoring portion is a square structure, and the area of ​​the stress monitoring portion is less than or equal to 5 mm*5 mm.

[0016] In this solution, the above arrangement is adopted to make the size of the stress monitoring part smaller, thereby reducing the space occupied in the radial direction of the sliding bearing.

[0017] Preferably, the pressure sensor further comprises a lead wire, wherein the lead wire is located at an outer peripheral side of the stress monitoring portion and the lead wire is used for being electrically connected to the lead plate.

[0018] In this solution, the above arrangement is used to connect the signal line of the system to the lead plate, and the electrical signal generated by the deformation of the piezoelectric film is transmitted to the acquisition system.

[0019] Preferably, the material of the packaging film is any one of PEEK, PI, PPS and POM.

[0020] In this solution, through the above settings, the pressure sensor can operate in the range of -40°C to 120°C for a long time.

[0021] Preferably, the pressure sensor further has a coating on its surface facing the sliding bearing, and the material of the coating is the same as that of the sliding bearing.

[0022] In this solution, through the above-mentioned settings, the pressure sensor can be suitable for the working conditions of the sliding bearing of the wind turbine gearbox, and when in contact with the sliding bearing, compared with different materials, the same material can adapt to the movement of the sliding bearing, improve the detection accuracy, and provide real-time feedback on the oil film pressure of the sliding bearing, reducing the pressure loss caused by different materials when transmitting the oil film pressure.

[0023] Preferably, the coating thickness is 1 μm-2 μm.

[0024] In this solution, by limiting the thickness of the coating, the accuracy of the pressure sensor in detecting the oil film pressure can be improved within a limited space in the radial direction of the sliding bearing.

[0025] Preferably, the pressure sensor has a thickness of 10 μm-30 μm and a measuring range of 60 MPa-100 MPa.

[0026] In this scheme, through the above-mentioned setting, compared with the traditional pressure sensor for monitoring the sliding bearing pressure of the wind turbine gearbox with a maximum range of ≥70MPa and a thickness of 20 microns to 30 microns, the pressure sensor with a flexible sensor film modified with carbon material has a sensitivity that is ≥60% higher than that without carbon material modification, a temperature resistance that is ≥40°C higher, a frequency response bandwidth that is ≥500Hz higher, and a sensor range that is ≥20MPa higher.

[0027] The positive and progressive effect of the present invention is that: the present invention arranges several stress monitoring parts through an array to form a flexible pressure sensor, so that the pressure sensor can be arranged on the outer surface of the sliding bearing in the radial direction. Compared with the traditional pressure detection method in which a larger sensor is arranged at the end of the pin shaft and the oil film is guided out through the radial pressure guide hole and the axial pressure guide hole, it can overcome the space limitation to ensure the continuity and original tension of the oil film, and then cooperate on the surface of the sliding bearing facing the inner hole of the gear, that is, the working surface to perform real-time and effective oil film pressure detection. The stress monitoring part includes a flexible sensor film modified by carbon material. The sensitivity of the flexible sensor film after carbon modification can be increased by more than 50%, the signal recognition ability is improved, and the complexity and cost of the subsequent amplification circuit and signal processing circuit are reduced. In addition, the modification of the carbon material can also improve the material's high temperature resistance, impact resistance, frequency response bandwidth and sensor range. The pressure sensor is accommodated by the mounting groove, so that it does not need to occupy additional space in the radial direction of the sliding bearing, ensuring the feasibility of pressure monitoring in the radial direction of the sliding bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the current structure for monitoring bearing oil film pressure.

[0029] Figure 2 FIG. 4 is a three-dimensional diagram of a pressure sensor according to a preferred embodiment of the present invention.

[0030] Figure 3 It is a structural schematic diagram of the stress monitoring unit array arrangement according to a preferred embodiment of the present invention.

[0031] Figure 4 FIG. 1 is a diagram showing the position relationship between the pin shaft and the pressure sensor of a preferred embodiment of the present invention.

[0032] Figure 5 This is a diagram showing the positional relationship between the sliding bearing and the pin shaft according to a preferred embodiment of the present invention.

[0033] Description of reference numerals:

[0034] Stress Monitoring Department 1

[0035] Flexible sensor film11

[0036] Electrode 12

[0037] Lead tray 13

[0038] Packaging film 14

[0039] Lead 2

[0040] Pressure Sensor 100

[0041] Pin 200

[0042] Mounting slot 201

[0043] Radial pressure guide hole 202

[0044] Axial pressure guide hole 203

[0045] Sliding bearing 300 DETAILED DESCRIPTION

[0046] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0047] This embodiment provides a sliding bearing including a pressure sensor, the specific structure of which is as follows: Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the sliding bearing including the pressure sensor includes a pin 200 and a sliding bearing 300, the sliding bearing 300 is sleeved on the outer peripheral side of the pin 200 and has an interference fit with the pin 200, and the sliding bearing 300 and the pin 200 extend into the inner hole of the gear of the wind power gearbox (not shown in the figure), which will not be described in detail here. Among them, a pressure sensor 100 is also provided on the outer surface of the sliding bearing 300 in the radial direction, and the sliding bearing including the pressure sensor is used for oil film pressure monitoring of the sliding bearing of the wind power gearbox, the pressure sensor 100 is arranged between the sliding bearing 300 and the inner hole of the gear, the pressure sensor 100 includes a plurality of stress monitoring parts 1, and the plurality of stress monitoring parts 1 are arranged in an array, the stress monitoring part 1 includes a flexible sensor film 11 modified by a carbon material, and an installation groove 201 corresponding to the pressure sensor 100 is opened on the outer surface of the sliding bearing 300 in the radial direction, and the pressure sensor 100 is attached to the bottom of the installation groove 201 and is arranged flush with the outer surface of the sliding bearing 300 in the radial direction.

[0048] Specifically, the pressure sensor 100 includes a plurality of stress monitoring parts 1, which are arranged in an array to form a rectangular structure of the pressure sensor 100. The stress monitoring part 1 includes a flexible sensor film 11 modified by a carbon material, so that the flexible sensor film 11 modified by the carbon material is used on the outer surface of the sliding bearing 300 in the radial direction, that is, when the sliding bearing 300 is deformed by the oil film pressure in the radial direction, the generated electrical signal is transmitted to the acquisition system to realize pressure monitoring. It can be understood that the sensitivity of the flexible sensor film 11 after carbon modification is improved by more than 50% compared with the piezoelectric film without carbon material modification, and the signal recognition ability is also improved, and the complexity and cost of the subsequent amplification circuit and signal processing circuit are reduced. Further, the flexible film sensor 11 modified by the carbon material can also improve the high temperature resistance, impact resistance, frequency response bandwidth and sensor range of the pressure sensor 100, so as to cope with various complex measurement conditions.

[0049] In this embodiment, a mounting groove 201 is opened on the side wall of the sliding bearing 300. The mounting groove 201 is a groove recessed along the radial direction of the sliding bearing 300. A plurality of stress monitoring parts 1 are arranged in an array to form a flexible pressure sensor 100, so that the pressure sensor 100 can be arranged on the outer surface of the radial direction of the sliding bearing 300. When the pressure sensor 100 is attached to the mounting groove 201, the surface of the pressure sensor 100 facing the gear of the wind power gearbox (specifically the inner hole of the gear) is flush with the outer surface of the sliding bearing 300 on the side of the mounting groove 201. Figure 1 It is shown that in the prior art, the oil film pressure is guided from the sliding bearing 300 to the end face of the pin 200 through the radial pressure guide hole 202 and the axial pressure guide hole 203. When the sensor is installed at the end face to detect the oil film pressure, if the radial pressure guide hole 202 is too large, the continuity of the oil film will be destroyed. If the radial pressure guide hole 202 is too small, the oil film pressure at the detection position cannot be transmitted to the sensor at the end face of the pin 200 in real time due to the tension of the oil in the hole, and the oil film pressure of the wind turbine gearbox sliding bearing cannot be effectively detected. In addition, the processing of the radial pressure guide hole 202 and the axial pressure guide hole 203 will also affect the structural strength of the sliding bearing 300 and the pin 200, thereby reducing their service life. Compared with Figure 1As for the pressure detection method in which the conventional larger-sized sensor (not shown in the figure) is arranged at the end of the pin 200 and guides the oil film out through the radial pressure guide hole 202 and the axial pressure guide hole 203, the pressure sensor 100 in this embodiment is arranged on the side wall of the sliding bearing 300 through the mounting groove 201, so that it does not need to occupy the side wall space of the sliding bearing 300, ensuring the feasibility of pressure monitoring on the side wall of the sliding bearing 300, so that the sliding bearing of the wind power gearbox can be installed and work normally. In addition, the pressure sensor 100 provided in this embodiment can overcome the space limitation that the conventional larger-sized sensor cannot be arranged on the surface of the inner hole of the sliding bearing 300 facing the gear, thereby ensuring the continuity and original tension of the oil film, and at the same time performing real-time and effective oil film pressure detection on the surface of the inner hole of the sliding bearing 300 facing the gear.

[0050] In this embodiment, the flexible sensor film 11 includes a polyvinylidene fluoride piezoelectric film, and the flexible sensor film 11 is modified with a carbon material. The carbon material used for carbon modification of the flexible sensor film 11 includes at least one of carbon nanotubes, graphene and carbon quantum dots.

[0051] Specifically, polyvinylidene fluoride piezoelectric film, also known as PVDF piezoelectric film, is a flexible material and can be deformed by oil film pressure. At the same time, PVDF piezoelectric film can also transmit electrical signals. A plurality of PVDF piezoelectric film arrays are arranged and electrically connected to a collection system for monitoring oil film pressure. When the piezoelectric film is deformed by oil film pressure, the generated electrical signal is transmitted to the collection system to achieve pressure monitoring. It is understandable that this embodiment does not improve the logic of transmitting electrical signals. The working principle of PVDF piezoelectric film is a prior art and will not be elaborated on here.

[0052] In this embodiment, the carbon material used for modifying the flexible sensor film 11 includes at least one of carbon nanotubes, graphene and carbon quantum dots. In a specific embodiment, the carbon material of the flexible sensor film 11 can be any one of carbon nanotubes, graphene and carbon quantum dots, or a combination of any two of carbon nanotubes, graphene and carbon quantum dots, or all of carbon nanotubes, graphene and carbon quantum dots. By modifying the PVDF piezoelectric film with at least one of carbon nanotubes, graphene and carbon quantum dots, the performance of the flexible sensor film 11 can be improved. It should be noted that after the carbon material is modified, the various properties of the PVDF piezoelectric film are improved, such as higher sensitivity, stronger signal recognition ability, reduced complexity and cost of the amplifier circuit and signal processing circuit electrically connected to the PVDF piezoelectric film, more resistant to high temperature and impact, and increased bandwidth and range of the LCL. Among them, the sensitivity of the PVDF piezoelectric film can be increased by more than 50%, and the response is faster and more accurate when monitoring the oil film pressure, ensuring the real-time nature of the detection data. In this embodiment, the high temperature resistance of the pressure sensor 100 can be improved by more than 30° C., and the frequency response bandwidth can be improved by more than 20%, so as to be suitable for oil film pressure monitoring under different working conditions.

[0053] Of course, in other implementations, other carbon-based materials in the prior art may be used to modify the PVDF piezoelectric film, which will not be elaborated herein.

[0054] In this embodiment, the stress monitoring part 1 further includes electrodes 12, and the electrodes 12 are arranged on opposite sides of the flexible sensor film 11;

[0055] The packaging film 14 is arranged on a side of the electrode 12 away from the flexible sensor film 11;

[0056] The lead pad 13 is electrically connected to the electrodes 12 on two opposite sides, and the lead pad 13 is located between the electrodes 12 and the packaging film 14 .

[0057] Specifically, the stress detection part 1 includes a flexible sensor film 11, an electrode 12, a lead plate 13 and a packaging film 14. Among them, the flexible sensor film 11 is a square structure and is located in the middle area of ​​the stress detection part 1. Two electrodes 12 are sequentially arranged from the flexible sensor film 11 to the outside. The two electrodes 12 are attached to the opposite sides of the flexible sensor film 11, and both electrodes 12 are square structures. Further, a lead plate 13 is also arranged outward from the two electrodes 12. The lead plate 13 is connected to the electrode 12 and is located on the side of the electrode 12 away from the flexible sensor film 11. In addition, a packaging film 14 is also arranged outward from the electrode 12. The packaging film 14 is a square structure and is used to seal the flexible sensor film 11, the electrode 12 and the lead plate 13 to form a complete stress monitoring part 1. The signal line of the acquisition system is electrically connected to the lead plate 13 to realize the transmission of the electrical signal generated by the deformation of the flexible sensor film 11 to the acquisition system. In this embodiment, the electrode 12 and the lead plate 13 are structures in the prior art and are not described in detail here.

[0058] In this embodiment, the size of the packaging film 14 is larger than that of the electrode 12 , the size of the electrode 12 is larger than that of the lead pad 13 , and the size of the electrode 12 is the same as that of the flexible sensor film 11 .

[0059] Specifically, the size of the electrode 12 is the same as the size and shape of the flexible sensor film 11, the lead plate 13 is smaller than the size of the electrode 12, and the size of the packaging film 14 is larger than the size of the electrode 12, so that the flexible sensor film 11, the electrode 12 and the lead plate 13 are sealed by the packaging film 14 to form a complete stress monitoring part 1, and prevent the flexible sensor film 11, the electrode 12 and the lead plate 13 from being larger than the packaging film 14 and extending out of the stress monitoring part 1.

[0060] In this embodiment, the stress monitoring part 1 is a square structure, and the area of ​​the stress monitoring part 1 is less than or equal to 5mm*5mm. That is to say, the size of the complete stress monitoring part 1 formed by the flexible sensor film 11, the electrode 12, the lead plate 13 and the packaging film 14 is less than or equal to 5mm*5mm, among which the size of the packaging film 14 is the largest, that is, the size of the packaging film 14 is less than or equal to 5mm*5mm. This allows multiple stress monitoring parts 1 to be arranged in an array, and by increasing the number of stress monitoring parts 1, the monitoring accuracy and monitoring range of the oil film pressure are improved. In addition, the small size of the stress detection part 1 can reduce the space occupied by the side wall of the pin 200.

[0061] In other embodiments, the area of ​​the packaging film 14 may be smaller than 1 mm*1 mm so as to further provide a greater number of stress monitoring parts 1 .

[0062] In this embodiment, the pressure sensor 100 further includes a lead wire 2 , which is located at the outer peripheral side of the stress monitoring part 1 and is used to be electrically connected to the lead plate 13 .

[0063] Specifically, a plurality of leads 2 are arranged perpendicularly to each other along the array direction of the stress monitoring part 1, and a plurality of leads 2 are perpendicularly arranged to form a receiving groove for receiving the stress monitoring part 1. The bottom of the receiving groove has a signal line, which is used to electrically connect to the lead disk 13, and the lead 2 is electrically connected to the lead disk 13 through the signal line. The stress monitoring part 1 is arranged in an array through the lead 2, and the stress monitoring part 1 is connected to the acquisition system through the signal line and the lead 2 to solve the problem of complex and disordered lines when several stress monitoring parts 1 are electrically connected to the signal line of the acquisition system. The lead 2 and the signal line are structures used to electrically connect to the lead disk 13 in the prior art, and will not be described in detail here.

[0064] In this embodiment, the material of the packaging film 14 is any one of PEEK, PI, PPS and POM.

[0065] Specifically, PEEK (polyetheretherketone), PI (polyimide), PPS (polyphenylene sulfide) and POM (polyoxymethylene) are all high molecular polymer materials in the prior art. The present embodiment does not improve their material composition, but uses them to package the modified PVDF piezoelectric film, so that the pressure sensor 100 formed by the stress monitoring part 1 in cooperation with the lead 2 can operate for a long time in the range of -40°C to 120°C, so as to adapt to the detection of oil film pressure under different working conditions.

[0066] In this embodiment, the surface of the pressure sensor 100 facing the sliding bearing further has a coating, and the material of the coating is the same as that of the sliding bearing 300 .

[0067] Specifically, in order to be applicable to the working conditions of the wind turbine gearbox sliding bearing, the present embodiment performs PVD (physical vapor deposition) on the working surface of the flexible pressure sensor 100 (the surface of the pressure sensor 100 facing the inner hole of the wind turbine gearbox gear), and specifically, PVD is performed on the surface of the pressure sensor 100 away from the inner hole of the gear to form a coating. The target material of the coating is preferably the same material as the sliding bearing 300, such as aluminum bronze, tin bronze, and coin bronze in the prior art. In the present embodiment, the coating is a metal coating with a deposition thickness of 1 μm-2 μm formed on the working surface, and the pressure sensor 100 is glued to the mounting groove 201 by a strong glue in the prior art. By setting the coating, the oil film pressure can be fed back to the pressure sensor 100 in real time, and the metal coating can also protect the pressure sensor 100, thereby extending the service life of the pressure sensor 100. Moreover, when in contact with the sliding bearing 300, the plating layer of the same material as the sliding bearing 300 can adapt to the movement of the sliding bearing 300, compared with a material different from the sliding bearing 300, thereby ensuring the ergonomic performance of the sliding bearing 300 while detecting the oil film pressure. Furthermore, since the material of the plating layer is the same as that of the sliding bearing 300, the working condition of the sliding bearing 300 can be fully simulated, thereby improving the detection accuracy of the pressure sensor 100. In addition, compared with sensors of different materials, the provision of the plating layer can reduce the pressure loss caused by different materials when transmitting the oil film pressure.

[0068] In this embodiment, the thickness of the pressure sensor 100 is 10μm-30μm, and the range is 60MPa-100MPa. That is to say, the total thickness of the pressure sensor 100 with a coating, and the pressure sensor 100 including the lead 2 and the stress monitoring part 1 is in the range of 10μm-30μm. Compared with the traditional sensor which is the same size as the operator's hand and can only be placed at the end of the pin 200, the method of conducting the oil film through the radial pressure guide hole 202 and the axial pressure guide hole 203 and then detecting the oil film pressure takes up less space, can be directly attached to the surface of the pin 200 in the radial direction, reduces the pressure loss of the oil film transmission, and detects the oil film pressure in real time. In addition, in this embodiment, for a thickness of 20μm-30μm, the sensitivity of the carbon-modified PVDF piezoelectric film is at least 60% higher than that of the PVDF piezoelectric film without carbon modification, the temperature resistance is at least 40°C higher, the frequency response bandwidth is at least 500Hz higher, and the range is at least 20MPa higher.

[0069] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A sliding bearing including a pressure sensor, wherein a pressure sensor is further provided on the radial outer surface of the sliding bearing, and the sliding bearing including the pressure sensor is used for oil film pressure monitoring of a sliding bearing of a wind power gearbox, and is characterized in that: The pressure sensor includes a plurality of stress monitoring parts, which are arranged in an array. The stress monitoring parts include a flexible sensor film modified by carbon material. An installation groove corresponding to the pressure sensor is opened on the outer surface of the sliding bearing in the radial direction, and the pressure sensor is attached to the bottom of the installation groove and is arranged flush with the outer surface of the sliding bearing in the radial direction.

2. The sliding bearing including a pressure sensor according to claim 1, characterized in that: The flexible sensor film comprises a polyvinylidene fluoride piezoelectric film, and the flexible sensor film is modified by a carbon material, wherein the carbon material used for carbon modification of the flexible sensor film comprises at least one of carbon nanotubes, graphene and carbon quantum dots.

3. The sliding bearing including a pressure sensor according to claim 1, characterized in that: The stress monitoring part further includes electrodes, and the electrodes are arranged on opposite sides of the flexible sensor film; A packaging film, wherein the packaging film is arranged on a side of the electrode away from the flexible sensor film; A lead pad is electrically connected to the electrodes at two opposite sides respectively, and the lead pad is located between the electrodes and the packaging film.

4. The sliding bearing including a pressure sensor according to claim 3, characterized in that: The size of the packaging film is larger than that of the electrode, the size of the electrode is larger than that of the lead pad, and the size of the electrode is the same as that of the flexible sensor film.

5. The sliding bearing including a pressure sensor according to claim 1, characterized in that: The stress monitoring portion is a square structure, and the area of ​​the stress monitoring portion is less than or equal to 5 mm*5 mm.

6. The sliding bearing including a pressure sensor according to claim 3, characterized in that: The pressure sensor further includes a lead wire, which is located at an outer peripheral side of the stress monitoring portion and is used to be electrically connected to the lead pad.

7. The sliding bearing including a pressure sensor according to claim 3, characterized in that: The packaging film is made of any one of PEEK, PI, PPS and POM.

8. The sliding bearing including a pressure sensor according to claim 1, characterized in that: The pressure sensor further has a coating on a surface facing the sliding bearing, and the material of the coating is the same as that of the sliding bearing.

9. The sliding bearing including a pressure sensor according to claim 8, characterized in that: The thickness of the coating is 1 μm-2 μm.

10. The sliding bearing including a pressure sensor according to claim 1, characterized in that: The pressure sensor has a thickness of 10 μm-30 μm and a measuring range of 60 MPa-100 MPa.

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