A non-contact sorting and measuring device and method for wheel hub bearings

Abstract

The present invention is entitled "A non-contact sorting and measuring device and method for wheel hub bearings", and belongs to the technical field of wheel hub bearing units. It mainly solves the problems of wear and tear caused by long-term use of contact sorting and measuring tooling, difficulty in repairing wear and tear, and easy scratching caused by wear and tear. Its main features are: using standard parts for equipment calibration, adopting laser scanning imaging, and having an image analysis system analyze and output the measured dimensions, and correcting relevant parameters according to the dimensions of the standard parts; replacing normal product parts to be measured, adopting laser scanning to image the contour of the product to be measured, and having an image analysis system analyze and output the measured dimensions, and having a program perform rapid clearance calculation and sorting according to the measured product part dimensions, and selecting a reasonable steel ball group difference. The present invention has the characteristics of simple and convenient operation, no restrictions on product structure, and a high degree of universality of production lines, and is mainly used for non-contact sorting and measurement of wheel hub bearings.

Description

Technical Field

[0001] The present invention belongs to the technical field of wheel hub bearing units, and in particular relates to a non-contact sorting and measuring device and method for wheel hub bearings. Background Art

[0002] During the assembly of automobile hub bearing units, there is a certain error range in the processing of the inner ring, outer ring and inner flange, resulting in a low success rate of fitting the inner ring, outer ring, inner flange and steel ball, which brings certain difficulties to the assembly process. To solve this difficulty, hub bearings often adopt the method of first sorting and measuring the part size, and then selecting the steel ball with the appropriate group difference to fit the part, so as to improve the one-time fitting success rate of the product and enhance the assembly efficiency.

[0003] The traditional wheel hub bearing sorting measurement adopts the tool contact measurement. The tool for sorting the outer ring 1 is as follows: Figure 1 As shown, the sorting and measuring tooling for the fitted inner ring 4 and inner flange 5 is as follows Figure 2 As shown, the sorting and measuring tooling requires high precision. Due to long-term contact use, the tooling will be worn. The worn tooling is difficult to repair. If the worn tooling continues to be used, there is a risk of scratching or knocking the wheel hub bearing raceway surface, and product quality cannot be guaranteed normally.

[0004] At present, most domestic wheel hub bearing manufacturers have single-line multi-product production lines. The design, production, inspection and installation of traditional contact sorting and measuring tooling are relatively cumbersome, the tooling investment cost is expensive, and products with different structures cannot be used interchangeably, which affects the intelligence and universality of the production line. Summary of the Invention

[0005] The present invention addresses the deficiencies in the existing technology and provides a non-contact sorting and measuring device and method for wheel hub bearings, which saves enterprises the cycle and capital investment in tooling design, processing, inspection, installation, and maintenance, improves the efficiency of rapid changeover of production lines, and achieves universal measurement requirements for products with different structures.

[0006] The technical solution of the device of the present invention is: a non-contact sorting and measuring device for wheel hub bearings, characterized in that it includes: a station I for placing a fixed inner ring and inner flange, a station II for placing a fixed outer ring, a first laser scanner, a second laser scanner and an image analysis system; wherein, the first laser scanner is installed on the station I; the second laser scanner is installed on the station II; the first laser scanner and the second laser scanner are respectively electrically connected to the image analysis system.

[0007] Furthermore, the workstation I is provided with a circular boss that cooperates with the inner flange and an inner ring limiter that cooperates with the inner ring; the workstation II is provided with a platform for placing the outer ring and an outer ring limiter that cooperates with the outer ring.

[0008] Furthermore, the second laser scanner is installed on the workstation I outside the circular boss; a mounting groove is provided at the center of the platform, and the bottom of the first laser scanner is installed in the mounting groove.

[0009] Furthermore, the image analysis system includes a touch screen display and a host. The touch screen display is connected to the host with a cable to display input and output results, and the host processes images, sizes, and calculations.

[0010] The technical solution of the method of the present invention is: a method for non-contact sorting and measurement of wheel hub bearings, characterized by comprising the following steps:

[0011] S100: Place the outer ring standard component on the inspection station II, use the outer ring limiter to limit the displacement of the outer ring standard component, use the first laser scanner to scan and image the groove profile, use the image analysis system to analyze the scanned image, and output relevant dimensions of the outer ring standard component, including: the upper groove diameter size of the outer ring standard component, the lower groove diameter size of the outer ring standard component, the upper groove curvature radius of the outer ring standard component, the lower groove curvature radius of the outer ring standard component, and the groove center distance of the outer ring standard component. According to the dimensions of the outer ring standard component, relevant parameters are corrected;

[0012] S200: placing the inner ring and inner flange standard parts on the inspection station I, limiting their displacement with the inner ring limiter, scanning and imaging the groove profile with a second laser scanner, analyzing the scanned image with an image analysis system, and outputting relevant dimensions of the inner ring and inner flange standard parts, including: inner ring groove diameter of the standard parts, inner ring groove curvature radius of the standard parts, inner flange groove diameter of the standard parts, inner flange groove curvature radius of the standard parts, and center-to-center distance between the two grooves of the standard parts. Relevant parameters are corrected according to the dimensions of the standard parts;

[0013] S300: Remove the outer ring standard parts, the inner ring and the inner flange fitting standard parts, replace them with the outer ring, the fitted inner ring and the inner flange of the normal product part to be tested, repeat steps S100 and S200, use the outer ring limiter to limit the outer ring displacement, use the first laser scanner to scan and image the groove profile, use the inner ring limiter to limit its displacement, use the second laser scanner to scan and image the groove profile, use the image analysis system to analyze the scanned images, and output the relevant dimensions of the outer ring, inner ring and inner flange, including: outer ring upper groove diameter size, outer ring lower groove diameter size, outer ring upper groove curvature radius, outer ring lower groove curvature radius, outer ring groove center distance, inner ring groove diameter size, inner ring groove curvature radius, inner flange groove diameter size, inner flange groove curvature radius, and two groove center distance, and the image analysis system stores and records the dimensions;

[0014] S400: Based on the relevant dimensions measured and output in step S300, the image analysis system quickly calculates and sorts the axial clearance of the hub bearing, and guides the selection of a reasonable steel ball group difference.

[0015] Furthermore, the calculation process of the product part dimensions in the S400 step is as follows:

[0016] According to the bearing theory, the axial clearance of the hub bearing is calculated by the following formula:

[0017]

[0018] where δa is the axial clearance of the hub bearing, De1 is the groove diameter dimension on the outer ring, Re1 is the groove curvature radius on the outer ring, Di1 is the groove diameter dimension on the inner ring, Ri1 is the groove curvature radius on the inner ring, De2 is the groove diameter dimension on the lower part of the outer ring, Re2 is the groove curvature radius on the lower part of the outer ring, Di2 is the groove diameter dimension of the inner flange, Ri2 is the groove curvature radius of the inner flange, Dw is the diameter of the steel ball, H is the distance between the centers of the two grooves, and L is the distance between the centers of the grooves on the outer ring;

[0019] Set the condition of the steel ball group difference: the value range of the group difference x is A = {a1, a2, a3, a4, a5, a6, a7},

[0020] where A is the steel ball group difference set, a1 is the first group difference, a2 is the second group difference, a3 is the third group difference, a4 is the fourth group difference, a5 is the fifth group difference, a6 is the sixth group difference, and a7 is the seventh group difference;

[0021] The image analysis system (8) quickly calculates according to the axial clearance calculation formula of the hub bearing, and obtains

[0022] δa(a1), δa(a2), δa(a3), δa(a4), δa(a5), δa(a6), δa(a7).

[0023] Furthermore, the sorting process of the product part dimensions in the S400 step is as follows:

[0024] 1) Set the axial clearance condition of the hub bearing: n ≤ δa ≤ m, where n is the lower limit of the hub bearing clearance and m is the upper limit of the hub bearing clearance;

[0025] 2) Let B = {δa(x)丨n ≤ δa(x) ≤ m, x ∈ A}, B is the clearance set of all steel ball group differences that meet the upper and lower limit ranges of the hub bearing clearance;

[0026] Take y(x) ∈ {y(x)丨y(x) = 丨δa(x) - (n + m) / 2丨, x ∈ A}, where y is the set of absolute values of the difference between the median value of the set hub bearing clearance range and the calculated clearance value;

[0027] Sort y(x) from small to large, then x is also sorted,

[0028] Then the order of δa(x) and the steel ball group difference x can be determined by the order of y(x);

[0029] The first x is the most reasonable steel ball group difference that satisfies the conditions x∈A, n≤δa(x)≤m.

[0030] When the first x is out of material, select the second x; when the first and second x are out of material, select the third x; and so on. In this way, the most reasonable steel ball group difference that meets the conditions is selected until the last x is selected.

[0031] The beneficial effects of the present invention are: using a laser scanner to replace the traditional contact sorting and measuring tooling, realizing the universal design of products with different structures, omitting the design, production, inspection, installation and maintenance process of the sorting and measuring tooling, saving resources for the enterprise, and at the same time, non-contact with the part raceway surface during detection, eliminating the risk of scratches and bumps on the wheel hub bearing raceway surface, simple and convenient production line changeover, high changeover efficiency and high degree of universalization.

[0032] The present invention has the characteristics of simple and convenient operation, no restrictions on product structure and high degree of production line universality, and is mainly used for non-contact sorting and measurement of wheel hub bearings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Schematic diagram of the outer ring of the contact sorting measurement in the prior art.

[0034] Figure 2 This is a schematic diagram of the inner ring and inner flange of the contact sorting and measuring sleeve in the prior art.

[0035] Figure 3 Schematic diagram of the non-contact sorting and measuring device of the present invention.

[0036] Figure 4 This is a schematic diagram of the inner ring and inner flange dimensions output by the image analysis system of the present invention.

[0037] Figure 5 This is a schematic diagram of the outer ring size output by the image analysis system of the present invention.

[0038] Explanation of the accompanying symbols: 1-outer ring; 2-outer ring limit; 3-first laser scanner; 4-inner ring; 5-inner flange; 6-inner ring limit; 7-second laser scanner; 8-image analysis system. DETAILED DESCRIPTION

[0039] The present invention will be described in detail below with reference to the accompanying drawings.

[0040] like Figure 3As shown, the present invention provides a non-contact wheel hub bearing sorting and measuring device comprising: a station I for mounting an inner ring 4 and an inner flange 5, a station II for mounting an outer ring 1, a first laser scanner 3, a second laser scanner 7, and an image analysis system 8. The first laser scanner 3 is mounted on station I, and the second laser scanner 7 is mounted on station II. The first laser scanner 3 and the second laser scanner 7 are each electrically connected to the image analysis system 8.

[0041] Workstation I is equipped with a circular boss that mates with the inner flange 5 and an inner ring stopper 6 that mates with the inner ring 4. The circular boss extends into the inner hole at the end of the inner flange 5, stabilizing the bottom of the fitted inner ring 4 and inner flange 5. The inner ring stopper 6 is linear or arc-shaped, with the outer end of its horizontal rod contacting the inner ring 4, stabilizing the upper portion of the fitted inner ring 4 and inner flange 5. A second laser scanner 7, a high-precision laser displacement scanner, is mounted on workstation I outside the circular boss and scans the exterior of the fitted inner ring 4 and inner flange 5.

[0042] Station II features a platform for placing the outer ring 1 and an outer ring stopper 2 that cooperates with it. The platform supports the outer ring 1 and stabilizes its lower end. The outer ring stopper 2 is linear or arc-shaped, with the outer end of its horizontal rod contacting the upper end of the outer ring 1, stabilizing the upper portion of the outer ring 1. A stepped mounting groove is located in the center of the platform. The first laser scanner 3, a high-precision laser displacement scanner, is mounted in the mounting groove with its upper end elevated above the upper end of the outer ring 1, enabling scanning of the interior of the outer ring 1.

[0043] The image analysis system 8 uses the ZXY-V1 version of the image analysis system, which includes a touchscreen display, a host computer, and a program (the touchscreen display is connected to the host computer via a cable and primarily displays output results; the program is stored in the host computer and primarily processes images, dimensions, and calculations). The image analysis system 8 uses the second laser scanner 7 to scan the raceway profile of the assembled inner ring 4 and inner flange 5 to obtain relevant dimensions. The first laser scanner 3 also scans the raceway profile of the outer ring 1 to obtain relevant dimensions. The image analysis system 8 then rapidly calculates and sorts the axial clearance of the hub bearing and guides the selection of appropriate ball group tolerances.

[0044] like Figures 3 to 5 As shown, the present invention provides a method for non-contact sorting and measurement of wheel hub bearings, comprising the following steps:

[0045] S100: Place the outer ring standard component on the inspection station II, use the outer ring limit 2 to limit the displacement of the outer ring standard component, use the first laser scanner 3 to scan and image the groove profile, use the image analysis system 8 to analyze the scanned image, and output relevant dimensions of the outer ring standard component, including: the outer ring standard component upper groove diameter De1, the outer ring standard component lower groove diameter De2, the outer ring standard component upper groove curvature radius Re1, the outer ring standard component lower groove curvature radius Re2, and the outer ring standard component groove center distance L. According to the outer ring standard component dimensions, relevant parameters are corrected;

[0046] S200: The inner ring and inner flange standard parts are placed on the inspection station I. The inner ring limiter 6 is used to limit their displacement. The second laser scanner 7 is used to scan and image the groove profile. The image analysis system 8 analyzes the scanned image and outputs the relevant dimensions of the inner ring and inner flange standard parts, including: the inner ring groove diameter Di1 of the standard part, the inner ring groove curvature radius Ri1 of the standard part, the inner flange groove diameter Di2 of the standard part, the inner flange groove curvature radius Ri2 of the standard part, and the center-to-center distance H of the two grooves of the standard part. The relevant parameters are corrected according to the standard part dimensions.

[0047] S300: Remove the outer ring standard parts, the inner ring and the inner flange fitting standard parts, replace them with the outer ring 1, the fitted inner ring 4 and the inner flange 5 of the normal product to be tested, repeat steps S100 and S200, use the outer ring limit 2 to limit the displacement of the outer ring 1, use the first laser scanner 3 to scan and image the groove profile, use the inner ring limit 6 to limit its displacement, use the second laser scanner 7 to scan and image the groove profile, use the image analysis system 8 to analyze the scanned images, and output the relevant dimensions of the outer ring 1, inner ring 4 and inner flange 5. The dimensions include: the upper groove diameter size De1 of the outer ring 1, the lower groove diameter size De2 of the outer ring 1, the upper groove curvature radius Re1 of the outer ring 1, the lower groove curvature radius Re2 of the outer ring 1, the groove center distance L of the outer ring 1, the groove diameter size Di1 of the inner ring 4, the groove curvature radius Ri1 of the inner ring 4, the groove diameter size Di2 of the inner flange 5, the groove curvature radius Ri2 of the inner flange 5, and the groove center distance H. The dimensions are stored and recorded by the image analysis system;

[0048] S400: Based on the relevant dimensions measured and output in step S300, the image analysis system 8 performs rapid calculation and sorting of the hub bearing axial clearance, and guides the selection of a reasonable steel ball group difference, wherein:

[0049] The calculation process for product parts sorting is as follows:

[0050] The calculation formula for the axial clearance of the hub bearing obtained from bearing theory is the existing conventional calculation formula for the axial clearance of the hub bearing, and the formula is as follows:

[0051]

[0052] Among them, δa is the axial clearance of the hub bearing, De1 is the groove diameter dimension on the outer ring 1, Re1 is the groove curvature radius on the outer ring 1, Di1 is the groove diameter dimension of the inner ring 4, Ri1 is the groove curvature radius of the inner ring 4, De2 is the groove diameter dimension under the outer ring 1, Re2 is the groove curvature radius under the outer ring 1, Di2 is the groove diameter dimension of the inner flange 5, Ri2 is the groove curvature radius of the inner flange 5, Dw is the diameter of the steel ball, H is the distance between the centers of the two grooves, and L is the distance between the centers of the grooves of the outer ring 1;

[0053] 1) Set the condition of the steel ball set difference: The value range of the Dw set difference x is A = {a1, a2, a3, a4, a5, a6, a7}, where A is the steel ball set difference set, a1 is the first set difference, a2 is the second set difference, a3 is the third set difference, a4 is the fourth set difference, a5 is the fifth set difference, a6 is the sixth set difference, and a7 is the seventh set difference;

[0054] 2) Set the axial clearance condition: n ≤ δa ≤ m, where n is the lower limit of the hub bearing clearance and m is the upper limit of the hub bearing clearance;

[0055] The image analysis system (8) quickly calculates according to the hub bearing axial clearance calculation formula, and obtains

[0056] δa(a1), δa(a2), δa(a3), δa(a4), δa(a5), δa(a6), δa(a7);

[0057] According to the above calculation results and conditions, the reasonable steel ball gauge value set difference is selected, and the selection process is as follows:

[0058] Let B = {δa(x)丨n ≤ δa(x) ≤ m, x ∈ A}, where B is the clearance set of all steel ball set differences that satisfy the hub bearing clearance upper and lower limit ranges;

[0059] Take y(x) ∈ {y(x)丨y(x) = 丨δa(x) - (n + m) / 2丨, x ∈ A}, where y is the set of absolute values of the difference between the median value of the set hub bearing clearance range and the calculated clearance value;

[0060] Sort y(x) from small to large, then x is also sorted,

[0061] Then the order of δa(x) and the steel ball set difference x can be determined by the order of y(x);

[0062] Take the first x as the most reasonable steel ball set difference that satisfies the condition of x ∈ A, a ≤ δa(x) ≤ b,

[0063] When the first x is out of stock, select the second x; when the first and second x are out of stock, select the third x; and so on, until the last x is selected as the most reasonable steel ball set difference that meets the conditions.

[0064] Then, the order of δa(x) and the ball set difference x can be determined by the order of y(x). For example, for the product part 53120 - 12048, through the image analysis system, it is measured that: outer flange Re1 = 6.67, Re2 = 6.68, De1 = 65.318, De1 = 65.316, L = 23.5, Di1 = 39.731, Ri1 = 6.54, Di2 = 39.733, Ri2 = 6.56, H = 22.922;

[0065] 1) Set the steel ball Dw = 12.7, and the set difference x takes 0, +2, -2, +4, -4, +6, -6 um;

[0066] 2) Set the axial clearance condition: -0.01 ≤ δa ≤ 0.02 mm;

[0067] Through the calculation of the image analysis system program, it is obtained that δa(0) = 0.0171, δa(+2) = 0.00999, δa(-2) = 0.0241, δa(+4) = 0.00284, δa(-4) = 0.0311, δa(+6) = -0.0044, δa(-6) = 0.03799. Then B = {δa(0), δa(+2), δa(+4), δa(+6)} = {0.0171, 0.00999, 0.00284, -0.0044};

[0068] Then y(x) ∈ {y(x)丨y(x) = 丨δa(x) - (-0.01 + 0.02) / 2丨} = {0.0121, 0.00499, 0.00216, 0.0094};

[0069] Arrange y(x) in ascending order as 0.00216 < 0.00499 < 0.0094 < 0.0121;

[0070] Then the arrangement of δa(x) is δa(+4), δa(+2), δa(+6), δa(0);

[0071] The arrangement of the steel ball set difference x is: +4, +2, +6, 0; Therefore, +4 is displayed as the most reasonable steel ball set difference according to the set requirements.

[0072] In summary, the non-contact sorting and measuring device and method of wheel hub bearings in the present application are applicable to the sorting and measurement of first-generation, second-generation, and third-generation (driven / non-driven / screwed / non-screwed) wheel hub bearing units. The production line conversion operation is simple and convenient, the measurement efficiency is high, and the design, manufacturing, inspection, installation, and maintenance processes of traditional sorting tooling are saved, thereby improving the universality of the production line.

[0073] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention's description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A non-contact sorting and measuring device for wheel hub bearings, characterized by: The invention comprises a station I for placing a fixed inner ring (4) and an inner flange (5), a station II for placing a fixed outer ring (1), a first laser scanner (3), a second laser scanner (7) and an image analysis system (8); wherein the first laser scanner (3) is installed on the station II; the second laser scanner (7) is installed on the station I; the first laser scanner (3) and the second laser scanner (7) are electrically connected to the image analysis system (8) respectively; the station I is provided with a circular boss matched with the inner flange (5) and an inner ring limiter (6) matched with the inner ring (4); the station II is provided with a platform for placing the outer ring (1) and an outer ring limiter (2) matched with the outer ring (1); the second laser scanner (7) is installed on the station I outside the circular boss; the center of the platform is provided with a mounting groove, and the bottom of the first laser scanner (3) is installed in the mounting groove.

2. The non-contact sorting and measuring device for wheel hub bearings according to claim 1, characterized in that: The image analysis system (8) includes a touch screen display and a host computer. The touch screen display and the host computer are connected by a cable to display the output results, and the host computer processes the image, size, and calculation.

3. A method for performing non-contact sorting and measuring of hub bearings using the non-contact sorting and measuring device for hub bearings according to claim 1 or 2, characterized in that The following steps are involved: S100: Place the outer ring standard part on the inspection station II, use the outer ring limiter (2) to limit the displacement of the outer ring standard part, use the first laser scanner (3) to scan and image the groove profile, use the image analysis system (8) to analyze the scanned image, and output the relevant dimensions of the outer ring standard part, including: the outer ring standard part upper groove diameter size (De1), the outer ring standard part lower groove diameter size (De2), the outer ring standard part upper groove curvature radius (Re1), the outer ring standard part upper groove curvature radius (Re2), the outer ring standard part groove center distance (L), and perform relevant parameter correction according to the outer ring standard part size; S200: placing the inner ring and inner flange standard parts on the inspection station I, using the inner ring limiter (6) to limit their displacement, using the second laser scanner (7) to scan and image the groove profile, using the image analysis system (8) to analyze the scanned image, and outputting the relevant dimensions of the inner ring and inner flange standard parts, including: the inner ring groove diameter size (Di1) of the standard parts, the inner ring groove curvature radius (Ri1) of the standard parts, the inner flange groove diameter size (Di2) of the standard parts, the inner flange groove curvature radius (Ri2) of the standard parts, and the center distance between the two grooves of the standard parts (H), and performing relevant parameter correction according to the standard parts dimensions; S300: Take out the outer ring standard parts, the inner ring and the inner flange assembly standard parts, and replace them with the outer ring (1) of the normal product to be measured, the assembled inner ring (4) and the inner flange (5). Repeat the steps of S100 and S200. Use the outer ring limit (2) to limit the displacement of the outer ring, use the first laser scanner (3) to scan and image the groove profile, use the inner ring limit (6) to limit its displacement, use the second laser scanner (7) to scan and image the groove profile, and use the image analysis system (8) to analyze the scanned image, and output the relevant dimensions of the outer ring (1), the inner ring (4) and the inner flange (5). The dimensions include: the groove diameter size (De1) on the outer ring (1), the groove diameter size (De2) under the outer ring (1), the groove curvature radius (Re1) on the outer ring (1), the groove curvature radius (Re2) under the outer ring (1), the groove center distance (L) of the outer ring (1), the groove diameter size (Di1) of the inner ring (4), the groove curvature radius (Ri1) of the inner ring (4), the groove diameter size (Di2) of the inner flange (5), the groove curvature radius (Ri2) of the inner flange (5), and the distance between two groove centers (H), and store and record them by the image analysis system; S400: According to the relevant dimensions measured and output in the S300 step, the image analysis system (8) performs rapid calculation and sorting of the axial clearance of the hub bearing, and guides the selection of a reasonable steel ball group difference; The axial clearance of the hub bearing is calculated by the following formula Wherein, δa is the axial clearance of the hub bearing, De1 is the upper groove diameter of the outer ring (1), Re1 is the curvature radius of the upper groove of the outer ring (1), Di1 is the groove diameter of the inner ring (4), Ri1 is the curvature radius of the groove of the inner ring (4), De2 is the lower groove diameter of the outer ring (1), Re2 is the curvature radius of the lower groove of the outer ring (1), Di2 is the groove diameter of the inner flange (5), Ri2 is the curvature radius of the groove of the inner flange (5), Dw is the diameter of the steel ball, H is the center distance between the two grooves of the inner ring (4) and the inner flange (5), and L is the center distance of the groove of the outer ring (1); Set the steel ball group difference condition: the value range of the group difference x is A = {a1, a2, a3, a4, a5, a6, a7}, where A is the steel ball group difference set, a1 is the first group difference, a2 is the second group difference, a3 is the third group difference, a4 is the fourth group difference, a5 is the fifth group difference, a6 is the sixth group difference, and a7 is the seventh group difference; The image analysis system (8) performs rapid calculation according to the axial clearance calculation formula of the hub bearing, and obtains δa(a1), δa(a2), δa(a3), δa(a4), δa(a5), δa(a6), δa(a7).

4. The method for non-contact sorting and measuring of wheel hub bearings according to claim 3, characterized in that In the S400 step described above: Set the axial clearance condition of the hub bearing: n ≤ δa ≤ m, where n is the lower limit of the hub bearing clearance and m is the upper limit of the hub bearing clearance; Let B = {δa(x)丨n ≤ δa(x) ≤ m, x ∈ A}, where B is the clearance set of all steel ball group differences that meet the upper and lower limits of the hub bearing clearance range; Take y(x) ∈ {y(x)丨y(x) = 丨δa(x) - (n + m) / 2丨, x ∈ A}, where y is the set of absolute values of the difference between the median value of the set hub bearing clearance range and the calculated clearance value; Sort y(x) from small to large, and then x is also sorted. Then the order of δa(x) and the steel ball group difference x can be determined by the order of y(x); Take the first x as the most reasonable steel ball group difference that satisfies the condition x ∈ A, n ≤ δa(x) ≤ m; When the first x is out of stock, select the second x; when the first and second x are out of stock, select the third x; And so on, until the last x is selected as the most reasonable steel ball group difference that meets the conditions.

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