Hub bearing inner and outer ring assembly type selection method and system

Abstract

The invention relates to a hub bearing inner ring and outer ring assembly type selection method and system, and relates to the field of bearing assembly.The hub bearing inner ring and outer ring assembly type selection method comprises the steps that the inner ring outer diameter value of a to-be-assembled bearing inner ring assembly is obtained through preset inner ring collecting equipment; determining an inner ring model of the bearing inner ring based on the outer diameter value of the inner ring and a preset inner ring size group; preset balls are assembled in the outer ring assembly, and preset outer ring assembly equipment is controlled to measure the inner diameter value and the inner diameter change curve of the balls and the outer ring assembly; according to the inner diameter value and a preset inner ring size group, determining an outer ring model of the adaptive bearing; the corresponding model group number is matched according to the outer ring model and the inner diameter change curve; and selecting an inner ring assembly corresponding to the to-be-assembled bearing based on the number of the model groups, and controlling preset outer ring assembly equipment to assemble the inner ring assembly and the outer ring assembly assembled with the balls to complete model selection and assembly. The method has the effect of reducing the rejection rate.

Description

Technical Field

[0001] This invention relates to the field of bearing assembly, and in particular to a method and system for selecting and assembling the inner and outer rings of a wheel hub bearing. Background Technology

[0002] Wheel bearings are a core component of the automotive chassis, bearing the weight of the vehicle body and providing precise guidance for wheel rotation. Their assembly quality directly affects the vehicle's ride comfort, braking reliability, and service life.

[0003] When performing assembly, the assembler first checks the dimensions of the inner ring assembly, outer ring assembly, and rolling elements to determine the height and outer diameter of the inner ring, the height and inner diameter of the outer ring, and the diameter of the rolling elements. The dimensional deviations of each part are recorded, and then the parts are divided into several groups according to the dimensional deviations. The parts within the same group whose dimensional differences are within the allowable range are selected to ensure that the assembly accuracy requirements are met.

[0004] During assembly, the finished bearing is obtained through manual measurement and assembly. When the components themselves have errors and the measurement and assembly are inaccurate, it will lead to a reduction in the load capacity of the bearing, an increase in the scrap rate, and affect the stability of machine operation. Summary of the Invention

[0005] To reduce the scrap rate, this invention provides a method and system for selecting and assembling inner and outer rings of wheel hub bearings.

[0006] In a first aspect, the present invention provides a method for selecting and assembling the inner and outer rings of a wheel hub bearing, employing the following technical solution: A method for selecting the inner and outer rings of a wheel hub bearing includes: The reaction force of the inner ring component being squeezed is collected by a pre-set inner ring acquisition device; The outer diameter of the inner ring of the bearing inner ring assembly to be assembled is determined based on the reaction force. The preset ball bearings are assembled into the outer ring assembly, and the preset outer ring assembly equipment is controlled to measure the inner diameter value and inner diameter change curve of the ball bearings and the outer ring assembly. Determine the outer ring model of the compatible bearing based on the inner diameter value and the preset inner ring size set; Match the corresponding model group based on the outer ring model and the inner diameter variation curve; Based on the model group number, select the inner ring assembly of the corresponding bearing to be assembled, and control the preset outer ring assembly equipment to assemble the inner ring assembly and the outer ring assembly with balls to complete the selection and assembly.

[0007] By adopting the above technical solution, the reaction force is collected, thereby realizing the closed-loop measurement of the outer diameter of the inner ring and the inner diameter of the outer ring assembly. The system automatically matches the model group and completes the press fitting. The selection and assembly are completed in one go, improving the qualification rate of wheel hub bearing assembly and thus reducing the scrap rate of the assembly line.

[0008] Optional methods for determining the outer diameter of the inner ring include: Plot the mechanical change curve based on the reaction force; Extract the deformation displacement during the extrusion process from the mechanical change curve; The extrusion distance is determined based on the deformation displacement and preset elastic parameters; The inner ring outer diameter value is determined based on the extrusion distance and the preset outer diameter standard range.

[0009] By adopting the above technical solution, a mechanical curve is plotted based on the reaction force, and the deformation displacement is extracted, which is then converted into the outer diameter of the inner ring. This avoids the human error of traditional caliper measurement, ensures that the outer diameter data is true and reliable, and lays the foundation for subsequent model matching.

[0010] Optional methods for extracting deformation displacement include: The characteristic mechanical points and their corresponding displacement coordinates are determined based on the mechanical change curve. The characteristic mechanical points include the initial compression point and the maximum compression point. Displacement data from the initial extrusion point to the maximum extrusion point are selected from the mechanical change curve to obtain the displacement difference; The extrusion displacement is determined based on the displacement coordinates and displacement differences; The initial deformation displacement is determined based on the compression displacement and preset test parameters; If it is confirmed that there is no abnormal displacement change between the initial compression point and the maximum compression point, then the initial deformation displacement is the deformation displacement. If an abnormal displacement change is confirmed between the initial compression point and the maximum compression point, the displacement change value is obtained; Deformation displacement is determined based on the initial deformation displacement and the abrupt change in displacement.

[0011] By adopting the above technical solution, the displacement difference between the initial extrusion point and the maximum extrusion point is determined on the mechanical change curve, thereby determining the deformation displacement, ensuring that the outer diameter calculation is not affected by local defects, and improving the measurement robustness.

[0012] Optionally, methods for extracting the initial compression point include: Determine the distribution pattern of characteristic mechanical points and the corresponding mechanical data intervals based on the mechanical change curves; Based on the mechanical data range, extract the mechanical baseline value before extrusion occurs; The initial extrusion force deviation threshold is matched based on the mechanical reference value; Based on the mechanical data range, mechanical data points exceeding the deviation threshold are selected as candidate initial extrusion points; Calculate the initial mechanical trend of candidate initial extrusion points to determine continuous variation characteristics; The initial extrusion point is determined based on the distribution pattern and continuous change characteristics.

[0013] By adopting the above technical solution, the mechanical data range is determined from the mechanical change curve, then the mechanical reference value and deviation threshold are determined, and then the initial extrusion point is determined in combination, so that the initial extrusion point is accurately located and the initial extrusion point is finally determined, providing initial data support for subsequent determination.

[0014] Optional methods for extracting the maximum squeeze point include: Determine the extrusion data range corresponding to the extrusion stage based on the mechanical change curve; Based on the compression data range, determine the target curve for peak determination; Extract the coordinate points in the target curve that are within the preset data standard range as candidate maximum squeezing points; Calculate the upward trend before the candidate maximum squeeze point and the downward trend after the candidate maximum squeeze point; The fluctuation value of the candidate maximum squeeze point is determined based on the upward and downward trends; The candidate maximum squeeze point with the smallest fluctuation value within the preset reference fluctuation range is selected as the maximum squeeze point.

[0015] By adopting the above technical solution, the position of the peak is first determined, and then the rising and falling trend and fluctuation value before and after the peak are used as screening conditions to determine the maximum compression point, reduce misjudgment, ensure the consistency of the deformation endpoint, and thus improve the repeatability of the outer diameter calculation.

[0016] Optionally, methods for determining the extrusion distance include: The elastic modulus and Poisson's ratio are determined based on the reaction force and preset elastic parameters. Determine the deformation recovery reference value of the material based on the deformation displacement and elastic modulus; Based on the mechanical change curve, combined with Poisson's ratio, the deformation transmission information of the material in the extrusion direction is determined; The initial extrusion distance is determined based on the deformation recovery benchmark value and deformation transmission information; The ultimate elastic deformation threshold is determined based on the initial extrusion distance and the preset elastic parameters, and it is determined whether the deformation corresponding to the initial extrusion distance exceeds the ultimate elastic deformation threshold. If the limit elastic deformation threshold is exceeded, the initial extrusion distance shall be recalculated based on the limit elastic deformation threshold. If the limit elastic deformation threshold is not exceeded, the initial extrusion distance will be used as the extrusion distance.

[0017] By adopting the above technical solution, the elastic modulus and Poisson's ratio are introduced, and the initial extrusion distance is checked in a closed loop according to the ultimate elastic deformation threshold, so that the extrusion distance always falls within the corresponding range, preventing overpressure damage, and ensuring the accuracy of dimensional conversion.

[0018] Optionally, methods for determining the deformation recovery reference value include: Based on the elastic modulus and the preset material deformation recovery amount, determine the basic coefficient and unit deformation of elastic deformation recovery; Match the critical deformation threshold based on the unit deformation; Calculate the corresponding deformation recovery potential value based on the basic coefficient and deformation displacement; The recovery characteristic value is determined based on the deformation recovery potential value and the deformation critical threshold. The deformation recovery characteristic values ​​are verified and updated according to the preset deformation recovery characteristic evaluation criteria. The deformation recovery baseline value is determined based on the unit deformation and the updated recovery characteristic value.

[0019] By adopting the above technical solution, the deformation recovery potential value is compared with the deformation critical threshold, thereby dynamically updating the recovery characteristic value and obtaining the deformation recovery benchmark value, ensuring that the measurement is not affected by the rebound change.

[0020] Optional methods for determining the deformation recovery potential value include: Based on the correlation weights between the basic coefficients and deformation recovery; The range of numerical variation is determined based on deformation displacement; Determine its impact coefficient on recovery potential based on the numerical range; By combining correlation weights and influence coefficients, a calculation model for the product of basic coefficients and deformation displacements is established. Substitute the specific values ​​of the basic coefficients and deformation displacements into the product calculation model to calculate the initial potential value; The initial potential value is calibrated according to the numerical range; If reasonable, after confirming that the verification has passed, determine the deformation recovery potential value based on the initial potential value.

[0021] By adopting the above technical solution, a product calculation model is constructed by constructing the correlation weight and influence coefficient. By quickly solving the deformation recovery potential value and calibrating it, the prediction of elastic recovery amount is more objective, and the accuracy of extrusion distance correction is improved.

[0022] Optional methods for determining the inner ring size include: Calculate the difference between the outer diameter of the inner ring and the preset inner ring size set; Select inner ring models whose differences are within the preset standard range of inner ring outer diameter as candidate models; If there is only one candidate model, then the candidate model is the bearing inner ring model; If there is not a single candidate model, compare the candidate models in the inner ring size group to determine additional parameters; The dimensional fit is determined based on the additional parameters and the outer diameter of the inner ring; The bearing inner ring model is determined based on the dimensional fit.

[0023] By adopting the above technical solution, candidate models are first screened by difference, and then the size fit is calculated. The system can still output the optimal inner ring model in the case of multiple candidates, realize the hierarchical progressive selection, ensure that the inner and outer ring fit clearance is in the optimal range, and improve the overall life of wheel hub bearing.

[0024] Secondly, this application provides a wheel hub bearing inner and outer ring assembly selection system, which adopts the following technical solution: A wheel hub bearing inner and outer ring assembly selection system, comprising: The acquisition module is used to acquire the reaction force; The memory is used to store the program that implements any method for selecting the inner and outer rings of a wheel hub bearing; The processor loads and executes programs from memory.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. The system automatically matches the model group and completes the press fitting for closed-loop measurement of the outer diameter of the inner ring and the inner diameter of the ball outer ring assembly. The selection and assembly are completed in one go, which improves the pass rate of wheel hub bearing assembly and reduces the scrap rate of the assembly line. 2. By comparing the deformation recovery potential value with the deformation critical threshold, the recovery characteristic value is dynamically updated to obtain the deformation recovery benchmark value, ensuring that the measurement is not affected by the rebound change; 3. First, candidate models are screened by difference, and then the size fit is calculated. The system can still output the optimal inner ring model even in the case of multiple candidates, realize the hierarchical progressive selection, ensure that the inner and outer ring fit clearance is in the optimal range, and improve the overall life of wheel hub bearing. Attached Figure Description

[0026] Figure 1 This is a flowchart of a method for selecting and assembling inner and outer rings of a wheel hub bearing according to an embodiment of the present invention; Figure 2 This is a flowchart of the maximum compression point extraction method according to an embodiment of the present invention. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0028] This application discloses a method for selecting the inner and outer rings of a wheel hub bearing.

[0029] Reference Figure 1 A method for selecting the inner and outer rings of a wheel hub bearing includes the following steps: Step S100: Collect the reaction force of the inner ring component by extrusion measurement using a preset inner ring acquisition device.

[0030] The inner ring assembly refers to the upper cover of the wheel hub bearing, which is used for sealing, protection, and auxiliary positioning.

[0031] The reaction force refers to the resistance of the inner ring component against extrusion during the extrusion measurement process.

[0032] First, the inner ring component is fixed on a stable measuring platform to prevent displacement or shaking during the extrusion process. Then, the inner ring acquisition device is controlled to extrude the outer surface of the inner ring component at a preset rate and force gradient. During the extrusion contact and gradual application of force, the inner ring component will generate a counterforce due to the external force. The preset force sensor on the inner ring acquisition device will capture the numerical change of this counterforce in real time and convert it into an electrical signal or digital signal for recording, thereby obtaining the data of the counterforce.

[0033] The inner ring acquisition device refers to the equipment used to acquire the outer diameter value of the bearing inner ring. It is an automated testing unit that integrates clamping fixtures, a force sensing system, and a stable measurement platform. During acquisition, the elastic material of the metal clamping mechanism presses the outer surface of the inner ring assembly centripetally at a preset rate and force gradient to obtain reaction force data. The inner ring acquisition device, rate, and force gradient are preset by technicians according to the actual situation and will not be described in detail here.

[0034] Step S101: Determine the outer diameter of the inner ring of the bearing inner ring assembly to be assembled based on the reaction force.

[0035] The inner ring outer diameter value refers to the outer diameter height dimension of the bearing inner ring assembly during assembly.

[0036] The method for determining the outer diameter of the inner ring is described in steps S200 to S204, and will not be repeated here.

[0037] Step S102: Determine the inner ring model of the bearing inner ring based on the inner ring outer diameter value and the preset inner ring size group.

[0038] The inner ring size group refers to the pre-set size classification combination of the bearing inner ring assembly, which is used to classify the inner diameter value and includes the boundary value of the inner diameter value of each group. It is pre-set by technicians according to the actual situation and will not be elaborated here.

[0039] The inner ring model refers to the specification model after classifying the bearing inner ring assembly according to its size.

[0040] The method for determining the inner ring model is described in steps S900 to S905, and will not be repeated here.

[0041] Step S103: Assemble the preset ball bearings into the outer ring assembly, and control the preset outer ring assembly equipment to measure the inner diameter value and inner diameter change curve of the ball bearings and the outer ring assembly.

[0042] Ball bearings refer to the rolling elements in a bearing.

[0043] The outer ring assembly refers to the lower cover of the outer ring of the wheel hub bearing. It is a sealing, protective, and auxiliary load-bearing component at the bottom of the bearing. Its selection and assembly must be compatible with the determined inner ring assembly to ensure the sealing effect at the bottom of the bearing and the overall operational stability.

[0044] The inner diameter value refers to the inner diameter dimension of the outer ring assembly.

[0045] The inner diameter change curve refers to the curve showing how the inner diameter of the outer ring component changes over time.

[0046] The outer ring assembly equipment is an automated assembly unit that integrates a robotic arm, positioning tooling, and a multi-sensor monitoring system.

[0047] The outer ring assembly equipment uses positioning fixtures to clamp and position the outer ring components. The robotic arm has multi-axis linkage capability and can drive the ball placement movement. During the assembly process, the outer ring assembly equipment uses positioning sensors to collect the circumferential position information of the outer ring raceway in real time to ensure that the balls are evenly distributed on the raceway. At the same time, the built-in force control module precisely controls the assembly force, so that the balls fit tightly with the outer ring raceway without abnormal stress, avoiding damage to the balls or deformation of the raceway.

[0048] Each determined inner diameter value is marked in the coordinate system, and based on the continuously generated inner diameter values ​​during the acquisition process, an inner diameter variation curve that changes with the measurement position is automatically plotted.

[0049] Step S104: Determine the outer ring model of the compatible bearing based on the inner diameter value and the preset inner ring size group.

[0050] The outer ring model refers to the specifications and model of the bearing's outer ring.

[0051] Different inner diameter values ​​correspond to different outer ring models. The inner ring size group represents different inner diameter values ​​for different outer ring models. First, using the inner ring size group as a benchmark, the required matching range of outer ring inner diameters for different inner ring models during assembly is identified. Then, the measured inner diameter values ​​are compared one by one with the matching range of outer ring inner diameters for each model in the inner ring size group to initially screen out candidate outer ring models whose inner diameter values ​​fall within the target matching range. If a candidate model is unique, it is directly determined as the matching outer ring model. If multiple candidate models exist, further verification is performed on each candidate model based on additional requirements such as the assembly accuracy level and load-bearing capacity matching standards specified in the inner ring size group to determine the final outer ring model.

[0052] Step S105: Match the corresponding model group number based on the outer ring model and the inner diameter change curve.

[0053] The model group number refers to the ordinal number of the model numbers of the matching bearing outer ring assemblies when they are grouped and statistically analyzed.

[0054] Different outer ring models and inner diameter variation curves correspond to different model group numbers. The model group number is obtained by inputting the outer ring model and inner diameter variation curve into the preset model group number database. The model group number database is a database that is preset by technicians according to the actual situation. The model group number database contains the relationship between the outer ring model and inner diameter variation curve and the model group number. The actual parameters are preset by technicians according to the actual situation, which will not be elaborated here.

[0055] Step S106: Based on the model group number, select the inner ring assembly of the corresponding bearing to be assembled, and control the preset outer ring assembly equipment to assemble the inner ring assembly and the outer ring assembly with balls to complete the selection and assembly.

[0056] First, the balls are assembled onto the outer ring assembly. The equipment uses a positioning fixture to securely clamp and position the outer ring assembly. A robotic arm with multi-axis linkage capability drives the ball delivery mechanism to move. At the same time, positioning sensors collect the circumferential position information of the outer ring raceway in real time to ensure that the balls are evenly distributed on the raceway. During this process, the equipment's built-in force control module precisely controls the assembly force, so that the balls fit tightly with the outer ring raceway without abnormal stress, avoiding damage to the balls or deformation of the raceway.

[0057] Next comes the selection and transport of inner ring components. Based on the determined number of model groups, the indicator light corresponding to the model on the preset inner ring component conveying equipment lights up. The automated mechanism selects the inner ring components that meet the requirements of the number of model groups and then transports them to the designated station of the outer ring assembly equipment. At this time, the equipment has already pre-loaded the outer ring components equipped with balls.

[0058] Finally, the inner and outer rings are precisely assembled. The outer ring assembly equipment first precisely aligns the inner ring component, which has been delivered to the outer ring component, to ensure that the assembly position of the inner ring component perfectly matches the distribution position of the balls in the outer ring component. Then, the equipment applies appropriate assembly force through a preset power device to smoothly press the inner ring component into the outer ring component equipped with balls. During the process, the assembly position accuracy and pressure changes are monitored in real time to avoid assembly deviations or component damage, thus completing the assembly of the inner and outer rings of the wheel hub bearing.

[0059] The method for determining the outer diameter of the inner ring includes the following steps: Step S200: Plot the mechanical change curve based on the reaction force.

[0060] A mechanical change curve refers to the curve of how the reaction force changes over time.

[0061] Plot the reaction force over time with time on the horizontal axis and the magnitude of the force on the vertical axis to create a mechanical change curve. The specific plotting method is common knowledge known to those skilled in the art and will not be elaborated here.

[0062] Step S201: Extract the deformation displacement during the extrusion process from the mechanical change curve.

[0063] Deformation displacement refers to the displacement change on the mechanical change curve that reflects the deformation during the extrusion process, and is used to determine the extrusion distance.

[0064] The method for extracting deformation displacement is described in steps S300 to S306, and will not be repeated here.

[0065] Step S202: Determine the extrusion distance based on the deformation displacement and the preset elastic parameters.

[0066] Elastic parameters refer to the parameters of the elastic material on the inner ring acquisition device when it is clamped, such as the stress-strain ratio and stiffness coefficient. These are preset by technicians according to the actual situation and will not be elaborated here.

[0067] Extrusion distance refers to the amount of displacement during the entire extrusion process.

[0068] The method for determining the extrusion distance is described in steps S600 to S606, and will not be repeated here.

[0069] Step S203: Determine the outer diameter value of the inner ring based on the extrusion distance and the preset outer diameter standard range.

[0070] The standard range of outer diameter refers to the standard size range of the outer diameter of the inner ring, which is preset by technicians according to the actual situation, and will not be elaborated here.

[0071] By comparing the extrusion distance with the standard range of outer diameter, the standard interval to which the extrusion distance belongs is determined, and the standard outer diameter value corresponding to this interval is the outer diameter value of the inner ring.

[0072] The method for extracting deformation displacement includes the following steps: Step S300: Determine the characteristic mechanical points and corresponding displacement coordinates based on the mechanical change curve. The characteristic mechanical points include the initial extrusion point and the maximum extrusion point.

[0073] Characteristic mechanical points refer to key points in the mechanical change curve, including the initial extrusion point and the maximum extrusion point.

[0074] The initial extrusion point refers to the characteristic point at which extrusion begins.

[0075] The maximum extrusion point refers to the point of greatest mechanical force during the extrusion process.

[0076] Displacement coordinates refer to the coordinates after including the displacement of the initial extrusion point and the maximum extrusion point.

[0077] The method for extracting the initial extrusion point is described in steps S400 to S405, and will not be repeated here.

[0078] The method for extracting the maximum compression point is described in steps S500 to S505, and will not be repeated here.

[0079] Step S301: Select the displacement data from the initial extrusion point to the maximum extrusion point from the mechanical change curve to obtain the displacement difference.

[0080] Displacement difference refers to the longitudinal displacement difference between the initial extrusion point and the maximum extrusion point.

[0081] The result obtained by calculating the difference between the longitudinal coordinates of the maximum extrusion point and the initial extrusion point is the displacement difference from the initial extrusion to the maximum extrusion. The displacement difference is used as the basis for determining the extrusion displacement and deformation displacement in combination with other parameters.

[0082] Step S302: Determine the extrusion displacement based on the displacement coordinates and displacement difference.

[0083] Extrusion displacement refers to the displacement between the initial extrusion point and the maximum extrusion point in the mechanical change curve.

[0084] By combining the specific values ​​of the displacement coordinates of the initial extrusion point and the maximum extrusion point with the obtained displacement difference, and by analyzing the correspondence between the two, minor errors or non-critical fluctuations that may exist in the measurement process are eliminated, and finally the displacement between the initial extrusion point and the maximum extrusion point in the mechanical change curve during the extrusion process is determined, which is used as the extrusion displacement.

[0085] Step S303: Determine the initial deformation displacement based on the extrusion displacement and preset test parameters.

[0086] Test parameters refer to the parameters used for testing that are set based on the standard data accumulated from testing. These include equipment measurement error correction values, deformation influence coefficients of materials under specific extrusion conditions, etc. These parameters are preset by technicians according to the actual situation and will not be elaborated here.

[0087] Initial deformation displacement refers to the deformation of the material when it is initially clamped.

[0088] The extrusion displacement is obtained by taking the displacement data from the initial extrusion point to the maximum extrusion point and the corresponding displacement coordinates in the mechanical change curve. The extrusion displacement value is then combined with the coefficients in the test parameters for weighting calculation. The influence of the test equipment system error is eliminated by the benchmark correction coefficient. The extrusion displacement is then converted into the actual deformation value of the material. The final result is the initial deformation displacement. The weights are preset by the technicians according to the actual situation, which will not be elaborated here.

[0089] Step S304: If it is confirmed that there is no abnormal displacement change between the initial extrusion point and the maximum extrusion point, then the initial deformation displacement is the deformation displacement.

[0090] Displacement mutation anomaly refers to an abnormal phenomenon in which the displacement changes abruptly.

[0091] These displacement data are analyzed to determine if there are any abnormal displacement abrupt changes. If the analysis confirms that there are no sudden jumps in the displacement data between the initial compression point and the maximum compression point that do not conform to the normal compression pattern, i.e., there are no abnormal displacement abrupt changes, then the obtained initial deformation displacement is directly determined as the deformation displacement.

[0092] Step S305: If it is confirmed that there is an abnormal displacement change between the initial extrusion point and the maximum extrusion point, the displacement change value is obtained.

[0093] Displacement mutation value is the abnormal displacement change that occurs during normal extrusion.

[0094] When an abnormal displacement change is confirmed between the initial extrusion point and the maximum extrusion point, all displacement data from the initial extrusion point to the maximum extrusion point are acquired and sorted according to the extrusion process. The continuous change trend of these displacement data is analyzed to determine the slope range of normal change. From the sorted displacement data, displacement data points that exceed the slope range are selected as displacement abrupt change points, indicating that there is an abnormal displacement change. The displacement difference between the displacement abrupt change point and the immediately preceding normal displacement data point is calculated, and this difference is the displacement abrupt change value.

[0095] Step S306: Confirm the deformation displacement based on the initial deformation displacement and the displacement abrupt change value.

[0096] When there is a sudden change in displacement, first determine the direction of the sudden change in displacement based on the initial deformation displacement. If it is a positive change, it indicates that there is an additional increase in displacement on the basis of normal deformation. Add the initial deformation displacement to the sudden change in displacement. If it is a negative change, it indicates that there is an abnormal decrease in displacement. Subtract the absolute value of the sudden change in displacement from the initial deformation displacement to obtain the final deformation displacement.

[0097] The method for extracting the initial extrusion point includes the following steps: Step S400: Determine the distribution pattern of characteristic mechanical points and the corresponding mechanical data intervals based on the mechanical change curve.

[0098] Distribution pattern refers to the distribution characteristics of characteristic mechanical points on a curve.

[0099] The mechanical data interval refers to the range of mechanical data corresponding to the characteristic mechanical point.

[0100] Analyzing the overall trend and stage characteristics of the mechanical change curve identifies key locations where force values ​​change. The distribution of these key locations on the curve is observed, such as whether they are concentrated in the initial rising segment, the intermediate stable segment, or the later falling segment, or whether they exhibit an orderly pattern with increasing displacement. This allows for the summarization of the distribution patterns of characteristic mechanical points. Based on this, and considering the force value range of these characteristic mechanical points within the distribution patterns, corresponding mechanical data intervals are defined. Using the minimum and maximum force values ​​of similar characteristic mechanical points within the distribution patterns as boundaries, the corresponding force value intervals for these types of characteristic mechanical points are determined; these are the mechanical data intervals.

[0101] Step S401: Based on the mechanical data range, extract the mechanical baseline value before the extrusion occurs.

[0102] The mechanical reference value refers to the relatively stable reference mechanical value before being subjected to substantial compression. It is set in advance by technicians according to the actual situation and will not be elaborated here.

[0103] When the inner ring component is not subjected to substantial compression within the mechanical data range, the mechanical data of it in a relatively stable state is obtained. By calculating the average value of these data, a value that reflects the initial mechanical state before compression is obtained. This value is the mechanical reference value before compression occurs.

[0104] Step S402: Match the initial extrusion force deviation threshold according to the mechanical reference value.

[0105] The force deviation threshold refers to the range of force deviation of the inner ring assembly under the measurement state before extrusion occurs.

[0106] The force deviation threshold is obtained by inputting the mechanical reference value into the preset force deviation threshold database. The force deviation threshold database is a database that is preset by technicians according to the actual situation. The force deviation threshold database contains the relationship between the mechanical reference value and the force deviation threshold. The actual parameters are preset by technicians according to the actual situation, which will not be elaborated here.

[0107] Step S403: Select mechanical data points that exceed the deviation threshold based on the mechanical data range as candidate initial extrusion points.

[0108] Candidate initial extrusion points refer to the possible initial extrusion points selected from the range of mechanical data.

[0109] Mechanical data points that exceed the deviation threshold are selected as candidate initial extrusion points, and the initial extrusion point is determined by judging whether it meets the requirements.

[0110] Step S404: Calculate the initial mechanical trend of the candidate initial extrusion point to determine the continuous variation characteristics.

[0111] Initial mechanical trend refers to the mechanical change trend of the candidate initial extrusion point.

[0112] Continuous variation characteristics refer to the continuous variation characteristics of mechanical data.

[0113] Extract the mechanical values ​​and corresponding displacement coordinates of candidate initial compression points and multiple adjacent points. By calculating the rate of change of the mechanical values ​​of these adjacent points with displacement, the slope and amplitude of the trend line are obtained, which is the initial mechanical trend. When determining the continuous change characteristics, first observe whether the changes in the mechanical values ​​of adjacent points conform to the preset continuous change law based on the above initial mechanical trend. The continuous change law, i.e., whether the rate of change is within a reasonable range and without sudden large jumps, indicates that the continuous change characteristics are continuous and stable. If there are abnormal jumps, the continuous change characteristics are interrupted or abruptly changed.

[0114] Step S405: Determine the initial extrusion point based on the distribution pattern and continuous change characteristics.

[0115] Based on the distribution pattern, determine the normal range of the initial extrusion point in the curve. Then, combine the continuous change characteristics to judge whether the change of its mechanical data conforms to the continuous increase or stable transition trend at the beginning of extrusion, and exclude discontinuous fluctuations caused by instantaneous interference. Match the reasonable position range pointed to by the distribution pattern with the trend reflected by the continuous change characteristics. If the candidate initial extrusion point is both within the position range defined by the distribution pattern and meets the mechanical change trend required by the continuous change characteristics, then the candidate initial extrusion point is the initial extrusion point.

[0116] Reference Figure 2 The method for extracting the maximum compression point includes the following steps: Step S500: Determine the extrusion data range corresponding to the extrusion stage based on the mechanical change curve.

[0117] The extrusion data range refers to the curve range in the mechanical change curve used to determine the corresponding extrusion stage.

[0118] Based on the mechanical change curve, identify the complete stage from the occurrence of the corresponding extrusion action to the end of the extrusion. By defining the start and end data nodes of this stage, delineate the exclusive interval of the extrusion stage, which is the extrusion data interval.

[0119] Step S501: Determine the target curve for peak determination based on the extrusion data range.

[0120] The target curve refers to the curve used for peak determination within the squeezed data range.

[0121] Using the squeezed data range as the scope, all valid data related to peak value determination within the range are filtered out. After removing irrelevant and interfering data within the range, the remaining valid data are integrated and sorted according to the original data logic. Based on the mechanical change curve, a curve specifically used for peak value determination is formed, which is the target curve.

[0122] Step S502: Extract the coordinate points in the target curve that are within the preset data standard range as candidate maximum compression points.

[0123] The data standard range refers to a pre-set reasonable range of extrusion force and corresponding displacement based on a large amount of historical data from normal extrusion measurements. This range includes the upper and lower limits of the force and displacement, ensuring that points falling within this range conform to the mechanical laws of normal extrusion. This range is pre-set by technicians according to actual conditions and will not be elaborated upon here.

[0124] The candidate maximum squeeze point refers to the candidate objects for further screening of the maximum squeeze point.

[0125] Based on the target curve and the preset data standard range, the values ​​of each coordinate point on the target curve are checked one by one to see if they are within the data standard range. All the coordinate points that meet the standard are selected as candidate maximum compression points.

[0126] Step S503: Calculate the upward trend before the candidate maximum squeeze point and the downward trend after the candidate maximum squeeze point.

[0127] An upward trend refers to the trend of the mechanical value gradually increasing before the candidate maximum compression point.

[0128] The downward trend refers to the gradual decrease in the mechanical value after the candidate maximum compression point.

[0129] Based on the candidate maximum compression point, a predetermined number of continuous data points are selected in the mechanical change curve before the candidate point. The trajectory of continuous data change before the target curve is traced, and the slope of the force value changing with displacement within this interval is calculated using a linear regression algorithm. A positive slope and a larger value indicate a steeper upward trend, and the calculated slope change is the upward trend. Similarly, the trajectory of continuous data change after the target curve is traced, and the slope of the force value changing with displacement is calculated using linear regression. A negative slope and a larger absolute value indicate a more significant downward trend, and the calculated slope change of this trajectory is the downward trend.

[0130] Step S504: Determine the fluctuation value of the candidate maximum squeeze point based on the upward and downward trends.

[0131] The fluctuation value refers to the mechanical fluctuation of the candidate maximum compression point.

[0132] Information such as the magnitude of data change and the range of slope fluctuations in the two trends is extracted. This information is then integrated through a preset calculation model to quantify the mechanical fluctuation corresponding to the candidate maximum compression point and determine the fluctuation value of the candidate maximum compression point. The calculation model integrates and quantifies this information through its built-in algorithm, which is preset by technicians according to the actual situation and will not be elaborated here.

[0133] Step S505: Select the candidate maximum squeeze point with the smallest fluctuation value within the preset reference fluctuation range as the maximum squeeze point.

[0134] The reference fluctuation range refers to the preset range used to determine whether the fluctuation value of the candidate maximum squeezing point is reasonable. It is preset by technicians according to the actual situation and will not be elaborated here.

[0135] First, candidate points whose fluctuation values ​​are within the preset reference fluctuation range are selected. Then, the candidate points that meet the range requirements are sorted by fluctuation value. The candidate with the smallest fluctuation value is selected as the final maximum squeeze point.

[0136] The method for determining the extrusion distance includes the following steps: Step S600: Determine the elastic modulus and Poisson's ratio based on the reaction force and preset elastic parameters.

[0137] The elastic modulus refers to the ratio of stress to strain in an elastic material during the elastic deformation stage, and is used to measure the material's ability to resist elastic deformation.

[0138] Poisson's ratio is the absolute value of the ratio of transverse strain to longitudinal strain when an elastic material is subjected to uniaxial tension or compression, reflecting the degree of transverse deformation of the material.

[0139] For the elastic modulus, based on the proportional relationship between the reaction force and the deformation generated by the material during extrusion, the elastic modulus of the material resisting deformation is calculated by substituting the reaction force value and the deformation reference coefficient in the preset elastic parameters. For Poisson's ratio, by referring to the correlation data of the material's transverse and longitudinal deformation under the action of the reaction force, and combining the benchmark ratio of transverse and longitudinal deformation in the preset elastic parameters, the distribution characteristics of the deformation caused by the reaction force in different directions are analyzed to derive the Poisson's ratio that reflects the relationship between the material's transverse contraction and longitudinal elongation.

[0140] Step S601: Determine the deformation recovery reference value of the material based on the deformation displacement and elastic modulus.

[0141] The deformation recovery benchmark value refers to the benchmark value for the material deformation recovery. It is set in advance by technicians according to the actual situation and will not be elaborated here.

[0142] The method for determining the deformation recovery reference value is described in steps S700 to S705, and will not be repeated here.

[0143] Step S602: Based on the mechanical change curve, determine the deformation transfer information of the material in the extrusion direction by combining Poisson's ratio.

[0144] Deformation transfer information refers to information such as the transfer efficiency, attenuation ratio, and distribution characteristics of deformation in the extrusion direction of a material.

[0145] By analyzing the trend of reaction force change with the extrusion process in the mechanical change curve, and combining the proportional relationship between the transverse and longitudinal deformation of the material reflected by Poisson's ratio, the path, range and change characteristics of the material deformation in the extrusion direction are derived from the stress point to the surrounding area, thus forming deformation transmission information.

[0146] Step S603: Determine the initial extrusion distance based on the deformation recovery reference value and deformation transmission information.

[0147] The initial extrusion distance refers to the actual contact extrusion length between the equipment and the outer surface of the inner ring component, which is calculated in advance.

[0148] First, the deformation recovery benchmark value is used as the core reference. This value clarifies the critical reference amount of deformation that the material can stably recover within the elastic deformation range, and is used as the basic anchor point for the extrusion distance. Then, based on the deformation transmission information, the benchmark value is modified in a targeted manner. The actual contact extrusion length between the extrusion execution end of the equipment and the outer surface of the inner ring component is the initial extrusion distance. The specific method is common knowledge known to those skilled in the art and will not be elaborated here.

[0149] Step S604: Determine the ultimate elastic deformation threshold based on the initial extrusion distance and the preset elastic parameters, and determine whether the deformation corresponding to the initial extrusion distance exceeds the ultimate elastic deformation threshold.

[0150] The ultimate elastic deformation threshold refers to the limit value of elastic deformation of a material, which is used to verify whether the initial extrusion distance is distorted.

[0151] The ultimate elastic deformation threshold is obtained by multiplying the initial compression distance and the elastic parameter.

[0152] Step S605: If the limit elastic deformation threshold is exceeded, recalculate the initial extrusion distance according to the limit elastic deformation threshold.

[0153] If the deformation corresponding to the initial extrusion distance exceeds the ultimate elastic deformation threshold, it indicates that the initial extrusion distance is too large and needs to be recalculated.

[0154] Step S606: If the limit elastic deformation threshold is not exceeded, the initial extrusion distance is taken as the extrusion distance.

[0155] If the deformation corresponding to the initial extrusion distance does not exceed the limit elastic deformation threshold, it means that the initial extrusion distance meets the requirements, and the initial extrusion distance is taken as the extrusion distance.

[0156] The method for determining the deformation recovery reference value includes the following steps: Step S700: Based on the elastic modulus and the preset material deformation recovery amount, determine the basic coefficient and unit deformation of elastic deformation recovery.

[0157] Material deformation recovery refers to the distance by which the material recovers its deformation after extrusion. It is preset by technicians according to the actual situation and will not be elaborated here.

[0158] The basic coefficient refers to the fundamental parameters used to determine the elastic deformation recovery.

[0159] Unit deformation refers to the smallest unit quantity during deformation.

[0160] Based on the material's ability to resist deformation as reflected by the elastic modulus, and combined with the material's deformation recovery, the basic coefficient and unit deformation of elastic deformation recovery are determined through proportional calculation and parameter conversion between the two. The specific method is common knowledge known to those skilled in the art and will not be elaborated here.

[0161] Step S701: Match the critical deformation threshold based on the unit deformation.

[0162] The critical deformation threshold refers to the boundary standard for classifying the deformation recovery characteristics of a material.

[0163] The deformation critical threshold is obtained by inputting the unit deformation variable into a preset deformation critical threshold database. The deformation critical threshold database is a database that is preset by technicians according to the actual situation. The deformation critical threshold database contains a lookup table of the correspondence between unit deformation variables and deformation critical thresholds. The lookup table is preset by technicians according to the actual situation and will not be described in detail here.

[0164] Step S702: Calculate the corresponding deformation recovery potential value based on the basic coefficient and deformation displacement.

[0165] Deformation recovery potential refers to the ability of a material to recover from its current deformation.

[0166] The method for determining the deformation recovery potential value is described in steps S800 to S806, and will not be repeated here.

[0167] Step S703: Determine the recovery characteristic value based on the deformation recovery potential value and the deformation critical threshold.

[0168] The recovery characteristic value refers to the value that reflects the deformation recovery characteristics of a material.

[0169] If the deformation recovery potential value is less than or equal to the deformation critical threshold, it indicates that the material's recovery ability under the current deformation is within the basic range. In this case, the recovery characteristic value can be directly taken as the ratio of the deformation recovery potential value to the deformation critical threshold, thus reflecting the basic recovery level. If the deformation recovery potential value is greater than the deformation critical threshold, it indicates that the material's recovery ability exceeds the basic range. The excess portion needs to be adjusted according to a preset excess coefficient. The adjusted result is then added to the basic ratio to obtain the final recovery characteristic value. In this way, combining the numerical relationship between the two and the corresponding calculation rules, the achievable recovery characteristic value is determined.

[0170] Step S704: Verify and update the recovery characteristic value according to the preset deformation recovery characteristic evaluation standard.

[0171] The evaluation standard for deformation recovery characteristics refers to the evaluation criteria for deformation recovery characteristics, which includes the qualified range, deviation level, compensation coefficient and adjustment rules corresponding to different recovery characteristics. It is set in advance by technical personnel according to the actual situation and will not be elaborated here.

[0172] The recovery characteristic value is compared with the acceptable range in the evaluation standard. If the recovery characteristic value is within the acceptable range, it indicates that it meets the basic requirements, and the verification passes. If the recovery characteristic value exceeds the acceptable range, its deviation level is determined according to the evaluation standard. Different deviation levels correspond to different adjustment rules. The recovery characteristic value is corrected according to the rules, and the adjusted recovery characteristic value is compared with the evaluation standard again to confirm whether it falls within the acceptable range. If it still does not meet the requirements, the above adjustment process is repeated until the recovery characteristic value meets the requirements of the evaluation standard. The updated recovery characteristic value at this point is the final result.

[0173] For example, if the deviation level is minor, the recovery characteristic value can be fine-tuned according to the proportion specified in the standard; if it is severe, the recovery characteristic value needs to be recalculated based on the compensation coefficient in the standard.

[0174] Step S705: Determine the deformation recovery baseline value based on the unit deformation and the updated recovery characteristic value.

[0175] Multiplying the unit deformation and the recovery characteristic value yields the deformation recovery reference value.

[0176] The method for determining the deformation recovery potential value includes the following steps: Step S800: Match the correlation weights related to deformation recovery based on the basic coefficients.

[0177] Correlation weights refer to the weight coefficients related to deformation recovery, which are used for subsequent model building.

[0178] The associated weights are obtained by inputting the basic coefficients into the preset associated weight database. The associated weight database is a database that is preset by the technicians according to the actual situation. The associated weight database contains the correspondence between the basic coefficients and the associated weights. The actual relationship is preset by the technicians according to the actual situation, which will not be elaborated here.

[0179] Step S801: Determine the range of values ​​for the change based on the deformation displacement.

[0180] The numerical range refers to the range of deformation displacement, which reflects the degree of deformation of the inner ring component during the extrusion process.

[0181] The numerical range is obtained by inputting the deformation displacement into a preset numerical range database. The numerical range database is a database that is preset by technicians according to the actual situation. The numerical range database contains the correspondence between deformation displacement and numerical range. The actual relationship is preset by technicians according to the actual situation, which will not be elaborated here.

[0182] Step S802: Determine its influence coefficient on recovery potential based on the numerical range.

[0183] The influence coefficient refers to the degree of influence on the recovery potential of elastic materials.

[0184] Based on the preset correspondence between numerical ranges and influence coefficients, different numerical ranges will be matched with different influence coefficients. This correspondence is preset based on material properties and a large amount of experimental data, reflecting the degree to which different deformation displacement ranges affect the recovery potential. The correspondence is preset by technicians according to the actual situation and will not be elaborated here.

[0185] Step S803: Combine the correlation weight and influence coefficient to establish a calculation model for the product of the basic coefficient and the deformation displacement.

[0186] The product calculation model refers to a quantitative calculation framework that incorporates correlation weights and influence coefficients.

[0187] By combining the correlation weights and influence coefficients through weighted summation, multiplication, or proportional allocation, their adjustment ratio and role in the product result in the model are determined. Based on this, a calculation framework is built, with the basic coefficients and deformation displacement set as the two core multiplication variables within the framework. At the same time, the integrated correlation weights and influence coefficients are embedded as adjustment factors to obtain the specific calculation form.

[0188] Step S804: Substitute the specific values ​​of the basic coefficients and deformation displacements into the product calculation model to calculate the initial potential value.

[0189] The initial potential value refers to the initial potential value that has not yet been calibrated for the numerical range.

[0190] The specific values ​​of the basic coefficients and deformation displacements are substituted into the model according to the calculation rules set by the product calculation model, and then multiplied to obtain the initial potential value.

[0191] Step S805: Calibrate the initial potential value according to the numerical range.

[0192] Determining whether the initial potential value is within a reasonable range corresponding to the current value range, the calibration method is common knowledge known to those skilled in the art, and will not be elaborated here.

[0193] Step S806: If reasonable, after confirming that the verification has passed, determine the deformation recovery potential value based on the initial potential value.

[0194] If the initial potential value is within a reasonable range corresponding to the current value range, the verification passes.

[0195] The method for determining the inner ring size includes the following steps: Step S900: Calculate the difference between the inner ring outer diameter value and the preset inner ring size group.

[0196] The difference refers to the difference between the outer diameter of the inner ring and the inner ring size group.

[0197] The difference between the outer diameter of the inner ring and the boundary value of the inner ring size group is calculated by subtracting the outer diameter value of the inner ring and the boundary value of the inner ring size group.

[0198] Step S901: Select inner ring models whose differences are within the preset standard range of inner ring outer diameter as candidate models.

[0199] The standard range of the inner ring outer diameter refers to the preset range of values ​​within which the inner ring outer diameter is allowed to fluctuate, which is used for difference screening. It is set in advance by technicians according to the actual situation and will not be elaborated here.

[0200] Candidate models refer to those inner ring models whose differences fall within the standard range of the inner ring outer diameter.

[0201] Referencing the standard range of inner ring outer diameter, select all inner ring models from the inner ring size group whose differences fall within the standard range of inner ring outer diameter. The inner ring models that meet the criteria are then selected as candidate models.

[0202] Step S902: If there is only one candidate model, then the candidate model is the bearing inner ring model.

[0203] If there is only one candidate model, the candidate model is the inner ring model of the bearing.

[0204] Step S903: If the candidate model is not unique, compare each candidate model in the inner ring size group to determine the additional parameters.

[0205] Additional parameters refer to parameters other than dimensions, such as the inner diameter of the inner ring, width, chamfer size, tolerance grade, material hardness, etc.

[0206] When there are multiple candidate models, meaning that the difference between the outer diameter value of the inner ring model and the outer diameter value of the inner ring of the bearing inner ring assembly to be assembled is within the standard range of the inner ring outer diameter, the additional parameters corresponding to each of these candidate models are extracted from the inner ring size group.

[0207] Step S904: Determine the dimensional fit based on the additional parameters and the inner ring outer diameter value.

[0208] Size conformity refers to the degree to which a size matches a standard.

[0209] First, based on the assembly and adaptation requirements of the wheel hub bearing, corresponding weights are assigned to the inner ring outer diameter value and each additional parameter. For each candidate model, the degree of fit between its actual inner ring outer diameter value and the target standard value is calculated. Then, the degree of fit of each parameter is multiplied by its preset weight to obtain the individual matching score of each parameter. Finally, the individual matching score corresponding to the inner ring outer diameter value is added to the individual matching scores of all additional parameters to obtain the comprehensive score of the candidate model. This comprehensive score is the dimensional fit. The weights are preset by the technicians and will not be elaborated here.

[0210] Step S905: Determine the bearing inner ring model based on the dimensional fit.

[0211] The inner ring model is obtained by inputting the size fit into the preset inner ring model database. The inner ring model database is a database that is preset by technicians according to the actual situation. The inner ring model database contains the correspondence between size fit and inner ring model. The actual correspondence is preset by technicians according to the actual situation, which will not be elaborated here.

[0212] Based on the same inventive concept, embodiments of the present invention provide a wheel hub bearing inner and outer ring assembly selection system, comprising: The acquisition module is used to acquire the reaction force.

[0213] The memory is used to store the program that implements any method for selecting the inner and outer rings of a wheel hub bearing.

[0214] The processor loads and executes programs from memory.

[0215] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional modules is used as an example. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. The specific working process of the system, device, and unit described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0216] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A method for selecting and assembling inner and outer rings of a wheel hub bearing, characterized in that, include: The reaction force of the inner ring component being squeezed is collected by a pre-set inner ring acquisition device; The outer diameter of the inner ring of the bearing inner ring assembly to be assembled is determined based on the reaction force. The inner ring model of the bearing is determined based on the outer diameter value of the inner ring and the preset inner ring size group; The preset ball bearings are assembled into the outer ring assembly, and the preset outer ring assembly equipment is controlled to measure the inner diameter value and inner diameter change curve of the ball bearings and the outer ring assembly. Determine the outer ring model of the compatible bearing based on the inner diameter value and the preset inner ring size set; Match the corresponding model group based on the outer ring model and the inner diameter variation curve; Based on the model group number, select the inner ring assembly of the corresponding bearing to be assembled, and control the preset outer ring assembly equipment to assemble the inner ring assembly and the outer ring assembly with balls to complete the selection and assembly.

2. The method for selecting and assembling inner and outer rings of a wheel hub bearing according to claim 1, characterized in that, The methods for determining the outer diameter of the inner ring include: Plot the mechanical change curve based on the reaction force; Extract the deformation displacement during the extrusion process from the mechanical change curve; The extrusion distance is determined based on the deformation displacement and preset elastic parameters; The inner ring outer diameter value is determined based on the extrusion distance and the preset outer diameter standard range.

3. The method for selecting and assembling inner and outer rings of a wheel hub bearing according to claim 2, characterized in that, Methods for extracting deformation displacement include: The characteristic mechanical points and their corresponding displacement coordinates are determined based on the mechanical change curve. The characteristic mechanical points include the initial compression point and the maximum compression point. Displacement data from the initial extrusion point to the maximum extrusion point are selected from the mechanical change curve to obtain the displacement difference; The extrusion displacement is determined based on the displacement coordinates and displacement differences; The initial deformation displacement is determined based on the compression displacement and preset test parameters; If it is confirmed that there is no abnormal displacement change between the initial compression point and the maximum compression point, then the initial deformation displacement is the deformation displacement. If an abnormal displacement change is confirmed between the initial compression point and the maximum compression point, the displacement change value is obtained; Deformation displacement is determined based on the initial deformation displacement and the abrupt change in displacement.

4. The method for selecting and assembling inner and outer rings of a wheel hub bearing according to claim 3, characterized in that, Methods for extracting the initial extrusion point include: Determine the distribution pattern of characteristic mechanical points and the corresponding mechanical data intervals based on the mechanical change curves; Based on the mechanical data range, extract the mechanical baseline value before extrusion occurs; The initial extrusion force deviation threshold is matched based on the mechanical reference value; Based on the mechanical data range, mechanical data points exceeding the deviation threshold are selected as candidate initial extrusion points; Calculate the initial mechanical trend of candidate initial extrusion points to determine continuous variation characteristics; The initial extrusion point is determined based on the distribution pattern and continuous change characteristics.

5. The method for selecting and assembling inner and outer rings of a wheel hub bearing according to claim 3, characterized in that, Methods for extracting the maximum compression point include: Determine the extrusion data range corresponding to the extrusion stage based on the mechanical change curve; Based on the compression data range, determine the target curve for peak determination; Extract the coordinate points in the target curve that are within the preset data standard range as candidate maximum squeezing points; Calculate the upward trend before the candidate maximum squeeze point and the downward trend after the candidate maximum squeeze point; The fluctuation value of the candidate maximum squeeze point is determined based on the upward and downward trends; The candidate maximum squeeze point with the smallest fluctuation value within the preset reference fluctuation range is selected as the maximum squeeze point.

6. The method for selecting and assembling inner and outer rings of a wheel hub bearing according to claim 3, characterized in that, Methods for determining the extrusion distance include: The elastic modulus and Poisson's ratio are determined based on the reaction force and preset elastic parameters. Determine the deformation recovery reference value of the material based on the deformation displacement and elastic modulus; Based on the mechanical change curve, combined with Poisson's ratio, the deformation transmission information of the material in the extrusion direction is determined; The initial extrusion distance is determined based on the deformation recovery benchmark value and deformation transmission information; The ultimate elastic deformation threshold is determined based on the initial extrusion distance and the preset elastic parameters, and it is determined whether the deformation corresponding to the initial extrusion distance exceeds the ultimate elastic deformation threshold. If the limit elastic deformation threshold is exceeded, the initial extrusion distance shall be recalculated based on the limit elastic deformation threshold. If the limit elastic deformation threshold is not exceeded, the initial extrusion distance will be used as the extrusion distance.

7. The method for selecting and assembling inner and outer rings of a wheel hub bearing according to claim 6, characterized in that, The methods for determining the deformation recovery reference value include: Based on the elastic modulus and the preset material deformation recovery amount, determine the basic coefficient and unit deformation of elastic deformation recovery; Match the critical deformation threshold based on the unit deformation; Calculate the corresponding deformation recovery potential value based on the basic coefficient and deformation displacement; The recovery characteristic value is determined based on the deformation recovery potential value and the deformation critical threshold. The deformation recovery characteristic values ​​are verified and updated according to the preset deformation recovery characteristic evaluation criteria. The deformation recovery baseline value is determined based on the unit deformation and the updated recovery characteristic value.

8. The method for selecting and assembling inner and outer rings of a wheel hub bearing according to claim 7, characterized in that, Methods for determining deformation recovery potential include: Based on the correlation weights between the basic coefficients and deformation recovery; The range of numerical variation is determined based on deformation displacement; Determine its impact coefficient on recovery potential based on the numerical range; By combining correlation weights and influence coefficients, a calculation model for the product of basic coefficients and deformation displacements is established. Substitute the specific values ​​of the basic coefficients and deformation displacements into the product calculation model to calculate the initial potential value; The initial potential value is calibrated according to the numerical range; If reasonable, after confirming that the verification has passed, determine the deformation recovery potential value based on the initial potential value.

9. The method for selecting and assembling inner and outer rings of a wheel hub bearing according to claim 1, characterized in that, The methods for determining the inner ring size include: Calculate the difference between the outer diameter of the inner ring and the preset inner ring size set; Select inner ring models whose differences are within the preset standard range of inner ring outer diameter as candidate models; If there is only one candidate model, then the candidate model is the bearing inner ring model; If there is not a single candidate model, compare the candidate models in the inner ring size group to determine additional parameters; The dimensional fit is determined based on the additional parameters and the outer diameter of the inner ring; The bearing inner ring model is determined based on the dimensional fit.

10. A wheel hub bearing inner and outer ring assembly and selection system, characterized in that, include: The acquisition module is used to obtain the outer diameter value of the inner ring; The memory is used to store the program for implementing the assembly and selection method of the inner and outer rings of any one of claims 1 to 9; The processor loads and executes programs from memory.

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