Chain transmission mechanism for monitoring lubrication based on friction power generation and lubricant matching method thereof

Abstract

The invention discloses a chain transmission mechanism capable of monitoring lubrication based on friction power generation and a lubricant matching method thereof, a plurality of composite textures uniformly distributed along the circumferential direction are arranged on the inner wall of a sleeve of a chain, the inner wall of the sleeve is coated with a charge receiving functional layer, and the surface of a pin shaft is plated with chromium and subjected to heat treatment; and one micro electronic amplifier and one integrated wireless transmitting module are arranged at intervals of a plurality of chain links. Abrasive particles are actively discharged through the directional diversion effect of the composite texture, meanwhile, the state of a lubricating oil film is analyzed in real time through a voltage signal obtained through a friction power generation signal generated by relative movement of the charge receiving functional layer and the pin shaft, and therefore a lubricating agent is replaced or supplemented in time when the oil film is in a failure state; and by constructing a film thickness dynamic correction model based on the voltage signal, film thickness calculation corresponding to the oil film failure state in the operation process of the chain transmission mechanism is achieved, a basis is provided for lubricant selection and matching, the overall lubricating effect and working condition adaptability of the selected and matched lubricant are improved, and the method is particularly suitable for the working condition of an electric vehicle.

Description

Technical Field

[0001] This invention belongs to the interdisciplinary field of mechanical transmission and intelligent monitoring, specifically relating to a chain transmission mechanism for monitoring lubrication status based on triboelectric power generation and a lubricant selection method based on a film thickness dynamic correction model. Background Technology

[0002] Chain drives, as a key component of mechanical transmission systems, are widely used in industrial manufacturing, transportation, and agricultural machinery. In the electric vehicle field, chain drives can be used in power transmission and distribution mechanisms, as well as for the motion transmission and synchronization control of electric actuators such as doors, seats, tailgates, and sunroofs. The transmission efficiency, noise level, and reliability of chain drives have a significant impact on vehicle energy consumption, driving comfort, and total lifespan maintenance costs. In chain drives, the sleeve-pin pair, as the main friction pair, bears long-term loads and undergoes frequent relative motion; its lubrication condition directly affects the chain's wear rate, fatigue life, and operational stability.

[0003] Currently, lubrication technology for sleeve-pin pairs still faces significant bottlenecks. The frequent start-stop cycles, load fluctuations, and alternating positive and negative torque characteristics of electric vehicles make related problems more easily exposed and accelerate their evolution. Traditional grease application or injection methods struggle to effectively supply and maintain lubricant as operating conditions change, easily leading to lubricant loss at high speeds and insufficient supply under heavy loads or temperature rises. This increases the proportion of boundary lubrication and the risk of dry friction. Wear debris trapped at the friction interface induces abrasive wear, accelerating the wear of the sleeve and pin and shortening the failure cycle, further resulting in decreased transmission efficiency and abnormal noise risks. Existing technologies largely rely on downtime disassembly and periodic maintenance, making it difficult to obtain key pre-failure information such as wear depth and lubricant film rupture during vehicle operation. Existing solutions incorporate oil storage textures on the inner wall of the sleeve to enhance oil supply capacity, but these solutions primarily focus on oil storage and replenishment, making it difficult to simultaneously achieve dynamic discharge of abrasive particles and adaptive control for complex operating conditions. Furthermore, chain lubrication designs lack an online sensing path for lubrication status, making it difficult to acquire film thickness changes in real time. This results in lubrication control lagging behind the evolution of operating conditions, and no lubricant selection method based on film thickness prediction results has been developed.

[0004] Therefore, in order to meet the application requirements of electric vehicles for long life, low noise and high reliability, it is urgent to develop a chain drive mechanism that integrates triboelectric power generation signal acquisition and lubrication status monitoring, and has the ability to dynamically clean abrasive particles. Furthermore, a film thickness dynamic correction model should be established, and a lubricant selection method based on film thickness prediction results should be developed, thereby improving the lubrication performance and reliability of the chain drive system under complex working conditions. Summary of the Invention

[0005] This invention addresses the lubrication failure of the sleeve-pin pair in chain drive mechanisms caused by high-speed centrifugal oil loss and abrasive particle retention, as well as the problem of dynamic control lag due to the inability of traditional methods to perceive the oil film status in real time. It proposes a chain drive mechanism and its lubricant selection method based on triboelectric power generation to monitor the lubrication status. The method analyzes the lubricating oil film status in real time, and replaces or replenishes the lubricant in a timely manner when the oil film fails, thereby improving the overall lubrication effect and working condition adaptability of the selected lubricant.

[0006] This invention relates to a chain drive mechanism for monitoring lubrication based on triboelectric power generation, comprising a driving sprocket, a driven sprocket, and a chain. The chain includes a pin, a sleeve, rollers, an inner chain plate, and an outer chain plate. Multiple composite textures are evenly distributed circumferentially on the inner wall of the sleeve. Each composite texture consists of 6–12 cylindrical oil reservoirs equidistantly arranged axially and trapezoidal guide grooves extending continuously axially and cutting through each cylindrical oil reservoir. The inner wall of the sleeve is coated with a charge-receiving functional layer. The pin surface is chrome-plated and heat-treated. A micro-electronic amplifier and an integrated wireless transmitter module are installed at intervals of several chain links. The micro-electronic amplifier is fixed to the end of the pin and electrically connected to the outer wall of the sleeve, while the integrated wireless transmitter module is fixed to the outer chain plate. A lubricant is provided between the pin and the sleeve. The sleeve, the micro-electronic amplifier, the pin, and the charge receiving functional layer form a circuit. The integrated wireless transmitter module consists of a signal conditioning module, a filtering module, a control module, a wireless transmission module, and a power supply module. The voltage signal amplified by the micro-electronic amplifier is transmitted to the signal conditioning module via a wire for level matching and amplitude modulation, and then transmitted to the filtering module for interference suppression and bandwidth control. The filtered effective signal enters the control module, which sends the oil film status determination result to the wireless transmission module. After radio frequency modulation, the signal is output as a radio wave and transmitted to the external receiver.

[0007] Preferably, the cylindrical oil storage tank has a depth of 10–25 μm and a diameter of 50–120 μm.

[0008] Preferably, the trapezoidal guide channel has a sidewall inclination angle of 60–80°, a depth of 5–15 μm, and a bottom width of 20–50 μm.

[0009] Preferably, the charge receiving functional layer is a modified polytetrafluoroethylene coating.

[0010] More preferably, the thickness of the modified polytetrafluoroethylene coating is 5–10 μm.

[0011] Preferably, the integrated wireless transmitter module is encapsulated in epoxy resin and a metal housing.

[0012] Preferably, the surface roughness of the chromium plating layer is controlled below 0.2 μm.

[0013] Preferably, the oil film state determination is as follows: the control module extracts the peak voltage V from the voltage signal transmitted by the filter module, and uses the duration from the entry to the exit of a single link as the determination time period, and counts the peak voltage V within any determination time period to satisfy... The percentage of the duration, The threshold is used to determine the oil film status as a failure state and output a replenishment command when the duration of a certain condition exceeds a preset ratio; otherwise, the oil film status is determined to be normal. Use 0.05–0.15mV.

[0014] More preferably, the determination time period is determined as follows: based on the wrap angle of the drive sprocket. This represents the central angle corresponding to the engagement and disengagement of a single chain link on the driving sprocket, with the driving sprocket speed set to... Then determine the time period. .

[0015] The present invention relates to a lubricant selection method for a chain drive mechanism based on triboelectric power generation monitoring and lubrication, as detailed below:

[0016] The expression for the film thickness dynamic correction model is as follows:

[0017]

[0018] in, The thickness of the film at the center of the contact area is given by α, and α is the voltage signal feedback adjustment coefficient. The voltage signal received by the control module at time t. This is the voltage reference value under the initial oil film condition. To calculate the position coordinates of the contact area along the pin axis in the circumferential direction of the film thickness, the equivalent radius of curvature is used. , , These represent the pin radius and sleeve inner diameter, respectively; β is the texture film thickness correction parameter; and the equivalent elastic modulus is... , , These are the elastic modulus of the chromium on the pin after heat treatment and the elastic modulus of the charge-receiving functional layer on the sleeve, respectively. , These are the Poisson's ratios of the chromium on the pin after heat treatment and the Poisson's ratio of the charge-receiving functional layer on the sleeve, respectively. , These are the coordinates of the inlet and outlet positions of the contact area along the circumferential direction of the pin shaft. The coordinate variables along the pin axis of the contact area The internal pressure of the oil film corresponding to time t.

[0019] By using a dynamic film thickness correction model, the film thickness value corresponding to the oil film failure state is obtained based on voltage signal feedback. This value is used as the failure film thickness of the lubricant under the corresponding operating conditions. Under the same operating conditions, the failure film thicknesses of different candidate lubricants are compared, and the lubricant with the smallest failure film thickness is selected.

[0020] The beneficial effects of this invention are as follows:

[0021] This invention features a composite texture on the inner wall of a sleeve, consisting of 6–12 cylindrical oil reservoirs equidistantly arranged axially and trapezoidal guide grooves extending continuously axially and cutting through each cylindrical oil reservoir. A charge-receiving functional layer is coated on the inner wall of the sleeve. The composite texture's directional guiding effect enables active discharge of abrasive particles. Simultaneously, a voltage signal generated by the frictional power generation between the charge-receiving functional layer and the pin shaft is used to analyze the lubricating oil film state in real time. This allows for timely replacement or replenishment of lubricant when the oil film fails. Furthermore, a dynamic film thickness correction model based on the voltage signal is constructed to calculate the film thickness corresponding to the oil film failure state during chain drive mechanism operation, providing a basis for lubricant selection. This improves the overall lubrication effect and adaptability of the selected lubricant, making it particularly suitable for electric vehicles with frequent start-stop cycles, load fluctuations, and alternating positive and negative torque. Addressing the application requirements of electric vehicles for long lifespan, low noise, and high reliability, this invention enhances the lubrication performance and reliability of chain drive systems under complex operating conditions. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the chain drive mechanism;

[0023] Figure 2 This is a schematic diagram of the structure of two adjacent chain segments in this invention. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings.

[0025] like Figure 1 and Figure 2As shown, the chain drive mechanism based on triboelectric power generation for monitoring lubrication includes a chain and a driving sprocket and a driven sprocket connected by the chain. The chain is composed of multiple chain links connected end to end. The connection method of adjacent chain links is as follows: the sleeve 11 is placed outside the pin 2, forming a rotating pair with the pin 2; the roller 5 is placed outside the sleeve 11, forming a rotating pair with the sleeve 11; two inner chain plates 6 are fixed at both ends of the sleeve 11 and contact the ends of the roller 5 respectively; two outer chain plates 1 are fixed at both ends of the pin 2. The inner wall 7 of the sleeve 11 has multiple composite textures evenly distributed along the circumference. The composite texture consists of 6-12 cylindrical oil reservoirs 9 arranged equidistantly along the axial direction and trapezoidal guide grooves 8 that extend continuously along the axial direction and cut through each cylindrical oil reservoir 9. The design incorporates a lubricant between the pin and the sleeve. A composite texture enhances the lubricant's storage, flow, and friction interface stability, providing significant oil film retention, redistribution, and abrasive particle migration control capabilities. The main texture employs cylindrical oil reservoirs, primarily used to temporarily store lubricant ejected by centrifugal force during chain drive operation. Specifically, when the pin and sleeve slide, the friction interface experiences periodic shear disturbances. These cylindrical oil reservoirs provide localized pressure release and temporary lubricant storage, offering a secondary oil source during lubricant film disturbances, mitigating film thickness fluctuations, and improving lubrication stability. The preferred depth range for the cylindrical oil reservoirs is 10–25 μm. The diameter is 50–120 μm; the auxiliary texture is set as a trapezoidal guide channel, which is connected to each cylindrical oil reservoir arranged in sequence in the axial extension direction to form a main and auxiliary integrated guide network. During the sliding process between the pin and the sleeve, the composite texture can induce the lubricating oil film to flow back to the central area of ​​the cylindrical oil reservoir in the shear flow field of the friction interface. At the same time, the trapezoidal guide channel realizes the directional displacement of fluid and abrasive particles, effectively reducing the residence time of abrasive particles in the main friction zone and delaying the risk of abrasive particle embedding and micro-damage. The preferred sidewall inclination angle of the trapezoidal guide channel is 60–80°, the depth range is 5–15 μm, and the bottom width is controlled between 20–50 μm.

[0026] The principle of real-time sensing of the oil film status driven by triboelectric power generation during the sliding process between the pin and the sleeve is as follows:

[0027] To achieve in-situ monitoring of the oil film status during operation of the sleeve-pin hinge pair, this invention proposes coating the inner wall 7 of the sleeve 11 with a modified polytetrafluoroethylene (or filled polytetrafluoroethylene resin) coating 10 as a charge receiving functional layer. The pin surface is hard chrome plated and heat-treated. A miniature electronic amplifier 3 and an integrated wireless transmitter module 4 are installed at intervals of several chain links. Considering cost, a set of miniature electronic amplifiers 3 and integrated wireless transmitter modules 4 can be installed at intervals of more chain links. The miniature electronic amplifier 3 is fixed to the end of the pin 2 and electrically connected to the outer wall of the sleeve. The integrated wireless transmitter module 4 is fixed to the outer chain plate 1 and can be encapsulated with epoxy resin and a metal shell for vibration and impact resistance. The miniature electronic amplifier 3 can be an INA333 amplifier.

[0028] When the sleeve 11 coated with modified polytetrafluoroethylene (PTFE) rubs against the surface of a pin that has been hard chrome plated and heat-treated, PTFE, being a highly electronegative polymer with a molecular structure rich in highly electronegative fluorine, exhibits strong electron affinity. Upon contact and friction with a neutral or positively charged metal surface, it can adsorb electrons and form a stable negative charge layer at the friction interface, thus creating a triboelectric interface on the inner wall of the sleeve. Furthermore, PTFE has a relative permittivity of approximately 2.0, providing excellent insulation properties, which helps prolong the charge residence time at the friction interface and enhances the retention and output stability of the triboelectric signal. Considering both the triboelectric effect and the durability of the negative charge layer, the preferred thickness of the modified PTFE coating 10 is 5–10 μm.

[0029] The pin surface is hard chrome plated and heat-treated to achieve a stable fit with the modified PTFE coating in terms of mechanical properties and electrical compatibility. The hard chrome layer has a hardness range of 60–70 HRC and a surface roughness controlled below 0.2 μm, providing good contact stiffness and wear resistance. Its surface electrical properties are relatively neutral, maintaining stable charge release characteristics during friction and avoiding potential fluctuations. The hard chrome surface is dense and chemically stable, containing no carbon- or nitrogen-rich regions, unlike diffusion treatments such as carburizing, carbonitriding, or vanadium diffusion. This allows it to maintain the consistency and repeatability of triboelectric signals under long-term sliding conditions. Through this design, the continuous sliding between the pin and the sleeve during chain drive operation will create periodic charge separation, outputting a stable micro-potential difference, providing a signal basis for oil film condition monitoring.

[0030] A negative charge layer formed by the sleeve, micro-electronic amplifier, pin, and modified PTFE coating creates a circuit. The micro-electronic amplifier performs initial data acquisition and low-noise amplification. Since the pin is a conductor, it can transfer potential with the micro-electronic amplifier without external leads, thus enabling in-situ acquisition of the triboelectric signal. The integrated wireless transmitter module 4 consists of a signal conditioning module, a filtering module, a control module, a wireless transmission module, and a power supply module. It processes and transmits the signal transmitted by the micro-electronic amplifier. The voltage signal amplified by the micro-electronic amplifier 3 is transmitted via wire to the signal conditioning module for level matching and amplitude modulation, then to the filtering module for interference suppression and bandwidth control. The filtered effective signal enters the control module for sampling and feature processing. The oil film state determination result is sent to the wireless transmission module as a digital signal via a serial bus. After radio frequency modulation, it is output as a radio wave and transmitted to an external receiver (e.g., a PC). The external receiver displays and records the oil film state. The signal conditioning module, filtering module, control module, wireless transmission module, and micro-electronic amplifier are all powered by the power supply module.

[0031] The sleeve is located in the friction contact area between adjacent composite textures, which is used to buffer the flow disturbance and film thickness gradient between adjacent composite textures. The distribution of composite textures is coordinated with the friction contact area, which can effectively improve the retention and redistribution of lubricant, promote abrasive migration, and thus reduce the interference of friction interface signals and improve the lubrication stability of the contact area. This collaborative design forms a microscale dynamic circulation of lubricant of "local retention - shear release - guided migration" during the operation of the chain drive mechanism, which improves the response consistency and anti-interference ability of the negative charge layer under complex working conditions and helps to maintain the stability of the negative charge layer.

[0032] The oil film status includes normal and failure states, determined as follows: The control module extracts the peak voltage V from the voltage signal transmitted by the filter module. The duration from engagement to disengagement of a single link is used as the determination time period. The peak voltage V within any determination time period is statistically analyzed to ensure it meets the following conditions: The percentage of the duration, The threshold is set so that when the duration exceeds a preset ratio, the oil film is considered to be in a failed state and a replenishment command is output; otherwise, the oil film is considered to be in a normal state. The judgment time period is determined according to the geometric parameters of the chain drive mechanism: based on the wrap angle of the drive sprocket. This represents the central angle corresponding to the engagement and disengagement of a single chain link on the driving sprocket, with the driving sprocket speed set to... (Unit: rpm) then determine the time period Taking a typical working condition as an example, , ,but In that Internal Statistics The duration percentage is set to a preset ratio of 0.5. When the duration percentage exceeds 0.5, the oil film is considered to be in a failed state; otherwise, the oil film is considered to be in a normal state. The value can be 0.05–0.15mV. The above values ​​are examples, and the specific values ​​can be calibrated and adjusted according to the operating conditions.

[0033] The lubricant selection method for the chain drive mechanism based on triboelectric power generation and lubrication monitoring is as follows:

[0034] The sleeve-pin hinge pair is mainly a line contact. For ease of analysis, it is simplified to an infinitely long line contact, that is, the contact between an infinitely long cylinder a and an infinitely large rigid plane b, with the rigid plane b remaining stationary and the long cylinder a undergoing pure sliding in the form of intermittent motion.

[0035] Assuming the lubricant is a Newtonian fluid, the Reynolds equation for isothermal contact under intermittent motion conditions is:

[0036]

[0037] Boundary conditions are ,and:

[0038]

[0039] Where ρ is the density of the lubricant, in kg / m³ 3 h represents the local film thickness, in μm. The dynamic viscosity of the lubricant is expressed in Pa·s. The coordinates of the contact area along the pin axis circumferentially The internal pressure of the oil film at time t, in Pa, is obtained from the Reynolds equations for isothermal contact under given boundary conditions. and film thickness Relationship; relative sliding speed of pin The unit is mm / s. , These are the rotational speeds of the sleeve and the pin, respectively. , These are the coordinates of the inlet and outlet positions of the contact area, in mm.

[0040] The film thickness equation under intermittent motion condition line contact is:

[0041]

[0042] in, The film thickness at the center of the contact area, in μm; For integration, the unit is μm; equivalent radius of curvature. Unit: mm , These are the pin radius and sleeve inner diameter, respectively; equivalent elastic modulus. Unit: MPa , These are the elastic modulus of the chromium on the pin after heat treatment and the elastic modulus of the modified polytetrafluoroethylene coating on the sleeve, respectively. , These are the Poisson's ratios of the chromium on the pin after heat treatment and the Poisson's ratio of the modified polytetrafluoroethylene coating on the sleeve, respectively.

[0043] Based on the Reynolds equation and film thickness equation for isothermal contact under the aforementioned intermittent motion conditions, to further achieve dynamic identification and adjustment of lubrication state and improve responsiveness to changes in actual operating conditions, this invention combines the triboelectric effect and composite texture of the sleeve-pin hinge pair during operation to construct a dynamic film thickness correction model based on online sensing and structural disturbance compensation. This model introduces a voltage signal feedback factor. With texture film thickness correction parameters The expression for the film thickness dynamic correction model is as follows:

[0044]

[0045] α is the voltage signal feedback adjustment coefficient, which is dimensionless and is used to characterize the influence of the relative change in the voltage signal at the friction interface on the thickness of the central film in the contact area. The larger the value of α, the more sensitive it is to the perception of the oil film state. The value range is 0.05 to 0.3. The voltage signal received by the control module at time t, in mV, reflects the state of the oil film at the friction interface; This is a voltage reference value under the initial oil film condition, in mV, used for... The film thickness fluctuation trend is compared and judged; β is the texture film thickness correction parameter, in µm, which describes the film thickness difference caused by the composite texture, and reflects the film thickness difference between the composite texture surface and the non-composite texture reference under the same working conditions. It is obtained by fitting the results of multiple calibration experiments.

[0046] Through the aforementioned dynamic film thickness correction model, the voltage signal, as in-situ sensing information of the oil film state, is introduced into the feedback factor of the film thickness term at the center of the contact area. This allows the dynamic film thickness correction model to dynamically reflect oil film state fluctuations during film thickness calculation, thereby achieving a sensitive response to changes in oil film state. The introduction of texture film thickness correction parameters provides stable compensation for the impact of using composite texture as a local lubrication enhancement unit on film thickness calculation. Composite texture as a local lubrication enhancement unit is particularly suitable for maintaining film thickness under conditions such as high-speed operation and intermittent loading. This dynamic film thickness correction model, while maintaining a clear mathematical structure and controllable calculation path, achieves dynamic fusion of structural disturbances and signal feedback, thereby outputting film thickness calculation results that can be used for oil film state assessment, providing a basis for lubricant selection.

[0047] This invention uses the film thickness calculation value from a dynamic film thickness correction model as an evaluation index to provide a basis for lubricant selection under different operating conditions. For sleeve-pin hinge pairs, different lubricants exhibit variations in kinematic viscosity, wetting and spreading ability, anti-wear film-forming ability, and volatility stability under different operating conditions (such as different operating temperatures). This leads to differences in the formation and maintenance capabilities of the film thickness in the contact area, and consequently, differences in the film thickness corresponding to lubrication failure for different lubricants. The dynamic film thickness correction model can dynamically correct the film thickness value during the operation of the chain drive mechanism based on voltage signal feedback and achieve numerical calculation. This allows for the acquisition of the film thickness value corresponding to the oil film failure state, which is then used as the failure film thickness of the lubricant under the corresponding operating condition, characterizing the film thickness level of the lubricant when lubrication failure occurs. Under identical operating conditions, the failure film thickness of different candidate lubricants can be compared. A smaller failure film thickness indicates that the lubricant can maintain a non-failure state even with a smaller film thickness, demonstrating stronger adaptability to film thickness fluctuations. Conversely, a larger failure film thickness indicates that the lubricant requires a greater film thickness to maintain stable lubrication, making it more prone to failure once the film thickness decreases during operation. This typically places higher demands on oil supply assurance and maintenance / replacement. Therefore, under the same operating conditions, lubricants with smaller failure film thicknesses should be prioritized to avoid premature failure while the film thickness is still relatively high, thereby maintaining the lubrication stability of the chain drive mechanism under different operating conditions.

Claims

1. A chain drive mechanism based on triboelectric power generation for monitoring lubrication, comprising a driving sprocket, a driven sprocket, and a chain, wherein the chain comprises a pin, a sleeve, a roller, an inner chain plate, and an outer chain plate, characterized in that: Multiple composite textures are evenly distributed circumferentially on the inner wall of the sleeve. Each composite texture consists of 6–12 cylindrical oil reservoirs equidistantly arranged axially and trapezoidal guide channels extending continuously axially and cutting through each cylindrical oil reservoir. The inner wall of the sleeve is coated with a charge receiving functional layer. The pin shaft surface is chrome-plated and heat-treated. A micro-electronic amplifier and an integrated wireless transmitter module are installed at intervals of several chain links. The micro-electronic amplifier is fixed to the end of the pin shaft and electrically connected to the outer wall of the sleeve. The integrated wireless transmitter module is fixed to the outer chain plate. A lubricant is provided between the pin shaft and the sleeve. The lubricant, sleeve, micro-electronic amplifier, pin, and charge receiving functional layer form a circuit; the integrated wireless transmitter module consists of a signal conditioning module, a filtering module, a control module, a wireless transmission module, and a power supply module. The voltage signal amplified by the micro-electronic amplifier is transmitted to the signal conditioning module via a wire for level matching and amplitude modulation, and then transmitted to the filtering module for interference suppression and bandwidth control. The filtered effective signal enters the control module, which sends the oil film state determination result to the wireless transmission module, and outputs it as a radio wave after radio frequency modulation to be transmitted to the external receiver.

2. The chain drive mechanism based on triboelectric power generation for monitoring lubrication according to claim 1, characterized in that: The cylindrical oil storage tank has a depth of 10–25 μm and a diameter of 50–120 μm.

3. The chain drive mechanism based on triboelectric power generation for monitoring lubrication according to claim 1, characterized in that: The trapezoidal guide channel has a sidewall inclination angle of 60–80°, a depth of 5–15 μm, and a bottom width of 20–50 μm.

4. The chain drive mechanism based on triboelectric power generation for monitoring lubrication according to claim 1, characterized in that: The charge receiving functional layer is a modified polytetrafluoroethylene coating.

5. The chain drive mechanism based on triboelectric power generation for monitoring lubrication according to claim 4, characterized in that: The thickness of the modified polytetrafluoroethylene coating is 5–10 μm.

6. The chain drive mechanism based on triboelectric power generation for monitoring lubrication according to claim 1, characterized in that: The integrated wireless transmitter module is encapsulated in epoxy resin and a metal casing.

7. The chain drive mechanism based on triboelectric power generation for monitoring lubrication according to claim 1, characterized in that: The surface roughness of the chromium plating layer is controlled below 0.2 μm.

8. The chain drive mechanism based on triboelectric power generation for monitoring lubrication according to claim 1, characterized in that: The oil film state is determined as follows: The control module extracts the peak voltage V from the voltage signal transmitted by the filter module, and uses the duration from the entry to the exit of a single link as the determination time period. The peak voltage V within any determination time period is statistically analyzed to ensure that it satisfies the following conditions: The percentage of the duration, The threshold is used to determine the oil film status as a failure state and output a replenishment command when the duration of a certain condition exceeds a preset ratio; otherwise, the oil film status is determined to be normal. Use 0.05–0.15mV.

9. The chain drive mechanism based on triboelectric power generation for monitoring lubrication according to claim 8, characterized in that: The determination time period is as follows: based on the wrap angle of the drive sprocket. This represents the central angle corresponding to the engagement and disengagement of a single chain link on the driving sprocket, with the driving sprocket speed set to... Then determine the time period. .

10. The lubricant selection method for the chain drive mechanism based on triboelectric power generation monitoring lubrication according to any one of claims 1 to 9 is as follows: The expression for the film thickness dynamic correction model is as follows: in, The thickness of the film at the center of the contact area is given by α, and α is the voltage signal feedback adjustment coefficient. The voltage signal received by the control module at time t. This is the voltage reference value under the initial oil film condition. To calculate the position coordinates of the contact area along the pin axis in the circumferential direction of the film thickness, the equivalent radius of curvature is used. , , These represent the pin radius and sleeve inner diameter, respectively; β is the texture film thickness correction parameter; and the equivalent elastic modulus is... , , These are the elastic modulus of the chromium on the pin after heat treatment and the elastic modulus of the charge-receiving functional layer on the sleeve, respectively. , These are the Poisson's ratios of the chromium on the pin after heat treatment and the Poisson's ratio of the charge-receiving functional layer on the sleeve, respectively. , These are the coordinates of the inlet and outlet positions of the contact area along the circumferential direction of the pin shaft. The coordinate variables along the pin axis of the contact area The internal pressure of the oil film corresponding to time t; By using a dynamic film thickness correction model, the film thickness value corresponding to the oil film failure state is obtained based on voltage signal feedback. This value is used as the failure film thickness of the lubricant under the corresponding operating conditions. Under the same operating conditions, the failure film thicknesses of different candidate lubricants are compared, and the lubricant with the smallest failure film thickness is selected.

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