Measuring device for the start-up friction torque of miniature rolling bearings applied to universal joints, working method, measuring system

Abstract

The application relates to the technical field of bearing detection, in particular to a measuring device for starting friction torque of a micro rolling bearing applied to a universal joint, which comprises a support structure, an arc-shaped guide rail is arranged on the support structure, a clamping and positioning mechanism is arranged on the support structure, a to-be-measured piece is arranged on the clamping and positioning mechanism, a measuring tool is arranged on a free end of the to-be-measured piece, a first magnetic piece is arranged on the side wall of the measuring tool, a correction hole is arranged at the bottom of the measuring tool, and a reset correction mechanism is arranged on the support structure, the reset correction mechanism comprises a correction shaft which is matched with the correction hole and is used for resetting the measuring tool. The measuring device for starting friction torque of the micro rolling bearing applied to the universal joint has the advantages of high measuring precision, good repeatability of measuring results and high automation degree, and can complete the measurement of starting friction torque values in two rotary directions of a pull rod universal joint.

Description

Technical Field

[0001] This invention relates to the field of bearing testing technology, specifically to a measuring device, working method, and measuring system for measuring the starting friction torque of a miniature rolling bearing applied to a universal joint. Background Technology

[0002] The starting friction torque of a bearing refers to the resistance torque that the inner and outer rings of the bearing must overcome at the instant they begin to rotate relative to each other under certain radial, axial, and preload forces. It is an important indicator for evaluating the dynamic performance of a bearing. Its value is affected by factors such as bearing design parameters, machining quality, load, and lubrication conditions. In high-end applications such as aerospace and aviation, the magnitude of the starting friction torque of bearings affects the accuracy, sensitivity, and flexibility of the system. Furthermore, since the starting friction torque of a bearing is a discrete random process, the calculated results have a large error compared to the actual value. Therefore, measurement methods are used to effectively guide engineering applications and provide experimental support for theoretical research.

[0003] Existing bearing friction torque measurement devices all target one or a pair of bearings, applying a certain axial or radial force to measure the friction torque value under given force conditions. This method cannot accurately reflect the actual friction torque value experienced by the bearing during operation in the system. Therefore, for miniature rolling bearings used in specific shaft systems, measuring their starting friction torque value in the rotational direction under actual operating conditions is a crucial research topic. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the fact that the existing bearing friction torque measuring devices are all designed for one or a pair of bearings, applying a certain axial force or radial force to them and measuring their friction torque value under a given force condition. This method cannot truly reflect the friction torque that the bearing is subjected to when it is working in the system. Therefore, the present invention provides a measuring device, working method and measuring system for measuring the starting friction torque of a miniature rolling bearing applied to a universal joint.

[0005] To address the aforementioned technical problems, this invention provides a measuring device for the starting friction torque of a miniature rolling bearing used in a universal joint, comprising: a support structure with an arc-shaped guide rail; a clamping and positioning mechanism disposed on the support structure, on which a workpiece to be measured is disposed; a measuring fixture disposed at the free end of the workpiece to be measured, wherein a first magnetic element is disposed on the side wall of the measuring fixture, and a calibration hole is disposed at the bottom of the measuring fixture; a reset and calibration mechanism disposed on the support structure, wherein the reset and calibration mechanism includes a calibration shaft that cooperates with the calibration hole for resetting the measuring fixture; two driving and loading mechanisms symmetrically disposed on both sides of the measuring fixture and located on the support structure, wherein a second magnetic element is disposed at the end of the driving and loading mechanism, and the driving and loading mechanism drives the second magnetic element to reciprocate on the support structure and move closer to the measuring fixture; and a force sensor disposed on the driving and loading mechanism.

[0006] Furthermore, the clamping and positioning mechanism includes: a sliding component disposed on the arc-shaped guide rail, and the sliding component sliding on the arc-shaped guide rail; a rotating component disposed on the sliding component, and a pull rod fixing seat provided on the rotating component, and the part to be measured is disposed on the pull rod fixing seat.

[0007] Furthermore, the sliding assembly includes: a locking slider, which is slidably disposed on the arc-shaped guide rail, and a locking handle is provided on the locking slider; a slider mounting base, which is disposed on the locking slider, and the rotating assembly is embedded in the slider mounting base.

[0008] Furthermore, the sliding assembly also includes multiple sliders, which are disposed on the arc-shaped guide rail and connected to the locking slider.

[0009] Furthermore, the rotating assembly includes: a rotating component disposed within the slider mounting base, and a rotating handle provided on the rotating component; a fixing plate disposed at the bottom of the rotating component and connected to the rotating component by screws, and the pull rod fixing base disposed on the fixing plate.

[0010] Furthermore, the reset and correction mechanism includes: a reset drive mechanism connected to the reset sliding platform; a reset support base disposed on the reset sliding platform, and the correction shaft disposed on the reset support base.

[0011] Furthermore, the driving loading mechanism includes: a mounting base disposed on the support structure, and a loading sliding platform disposed on the mounting base, one end of the loading sliding platform being provided with a loading driving structure; a loading mounting seat disposed on the loading sliding platform, and the second magnetic component disposed on the loading mounting seat.

[0012] Furthermore, the second magnetic component includes: a loading rod disposed on the loading mounting base, the force sensor disposed on the free end of the loading rod; and a permanent magnet disposed on the loading rod and placed at the input end of the force sensor.

[0013] The present invention also provides a method for operating the measuring device for the starting friction torque of a miniature rolling bearing applied to a universal joint, comprising: setting a measuring fixture on the free end of the workpiece to be measured, and setting the workpiece to be measured on a clamping and positioning mechanism; using the calibration shaft on the reset and calibration mechanism to cooperate with the calibration hole at the bottom of the measuring fixture to calibrate the position of the workpiece to be measured; then using the second magnetic component on the drive loading mechanism to reciprocate relative to the first magnetic component on the measuring fixture, and using a force sensor to detect the maximum static friction force of the workpiece to be measured in the rotation direction, thereby calculating the starting friction torque value in the rotation direction.

[0014] The present invention also provides a measurement system for the starting friction torque of a miniature rolling bearing applied to a universal joint, including the aforementioned measuring device for the starting friction torque of a miniature rolling bearing applied to a universal joint.

[0015] The technical solution of this invention has the following advantages:

[0016] 1. The present invention provides a measuring device for measuring the starting friction torque of a miniature rolling bearing applied to a universal joint, comprising: a support structure, wherein an arc-shaped guide rail is provided on the support structure; a clamping and positioning mechanism is provided on the support structure, wherein a workpiece to be measured is provided on the clamping and positioning mechanism; a measuring fixture is provided at the free end of the workpiece to be measured, wherein a first magnetic element is provided on the side wall of the measuring fixture, and a calibration hole is provided at the bottom of the measuring fixture; a reset and calibration mechanism is provided on the support structure, wherein the reset and calibration mechanism includes a calibration shaft, the calibration shaft cooperating with the calibration hole for resetting the measuring fixture; two driving and loading mechanisms are symmetrically arranged on both sides of the measuring fixture and located on the support structure, wherein a second magnetic element is provided at the end of the driving and loading mechanism, and the driving and loading mechanism drives the second magnetic element to reciprocate on the support structure and approach the measuring fixture; and a force sensor is provided on the driving and loading mechanism.

[0017] By incorporating an arc-shaped guide rail on the support structure and a clamping and positioning mechanism on the guide rail, the stability of the measured part is ensured through clamping and positioning. This allows for the measurement of the frictional torque in both rotational directions. Furthermore, the arc-shaped guide rail increases the initial measurement position of the measured part in the same rotational direction, enabling measurement from different starting positions within a range of -30° to 30°. A measuring fixture is placed at the bottom of the measured part. This fixture can be corrected using a reset and calibration mechanism. The calibration shaft of the reset and calibration mechanism engages with the calibration hole of the measuring fixture to achieve the corrected reset of the measured part. Then, the second magnetic component is driven to move on the support structure by the driving loading mechanism. The second magnetic component approaches the first magnetic component on the measuring fixture. The second magnetic component and the first magnetic component generate a repulsive force. When the generated repulsive force is greater than the maximum static friction force in the rotation direction of the part to be measured, the maximum static friction force of the part to be measured is measured by the force sensor, thereby calculating the starting friction torque value.

[0018] The measuring device for the starting friction torque of the miniature rolling bearing applied to the universal joint has advantages such as high measurement accuracy, good repeatability of measurement results, and high degree of automation. It can measure the starting friction torque value in both rotational directions of the tie rod universal joint.

[0019] This device for measuring the starting friction torque of a miniature rolling bearing applied to a universal joint can measure the starting friction torque of the support bearing at the rotation center of the measured part in different starting positions (-30° to 30°), and can measure the starting friction torque of the measured part in both rotational directions. This device can achieve slow application of a small force, ensuring that the force sensor can collect the maximum static friction force in the rotational direction of the measured part, thereby calculating the starting friction torque value at that position. This device can also achieve tooling reset after unidirectional measurement, ensuring the continuity of multiple measurements.

[0020] 2. The present invention provides a measuring device for the starting friction torque of a miniature rolling bearing applied to a universal joint. The sliding assembly further includes multiple sliding elements disposed on the arc-shaped guide rail and connected to the locking slider. The sliding elements assist the locking slider in sliding, allowing it to slide smoothly on the arc-shaped guide rail.

[0021] 3. The present invention provides a measuring device for the starting friction torque of a miniature rolling bearing applied to a universal joint, wherein the second magnetic component includes: a loading rod disposed on the loading mounting base, the force sensor disposed at the free end of the loading rod; and a permanent magnet disposed on the loading rod and close to the input end of the force sensor. A copper sleeve is provided on the force sensor input end on the free end of the loading rod, and the permanent magnet is disposed within the copper sleeve, i.e., the copper sleeve is used to position and install the permanent magnet.

[0022] The summary section is provided to present the chosen concepts in a simplified form, which will be further described in the detailed description below. The summary section is not intended to identify essential or necessary features of this disclosure, nor is it intended to limit the scope of this disclosure. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 A schematic diagram of the structure of the measuring device for measuring the starting friction torque of a miniature rolling bearing applied to a universal joint, provided by the present invention;

[0025] Figure 2 A perspective view of the measuring device for measuring the starting friction torque of a miniature rolling bearing applied to a universal joint, provided by the present invention;

[0026] Figure 3 A schematic diagram of the structure of the measuring component for the measuring device of the starting friction torque of a miniature rolling bearing applied to a universal joint provided by the present invention;

[0027] Figure 4 A schematic diagram of the reset and correction mechanism of the measuring device for the starting friction torque of a miniature rolling bearing applied to a universal joint, provided by the present invention;

[0028] Figure 5 A schematic diagram of the sliding assembly of the measuring device for the starting friction torque of a miniature rolling bearing applied to a universal joint, provided by the present invention;

[0029] Figure 6 A schematic diagram of the pointer of the measuring device for measuring the starting friction torque of a miniature rolling bearing applied to a universal joint, provided by the present invention;

[0030] Figure 7 A schematic diagram of the measuring fixture for measuring the starting friction torque of a miniature rolling bearing applied to a universal joint, provided by the present invention;

[0031] Figure 8 Bottom view of the measuring fixture for measuring the starting friction torque of a miniature rolling bearing applied to a universal joint, as provided by the present invention.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Support structure; 2. Arc-shaped guide rail; 3. Clamping and positioning mechanism; 4. Measured part; 5. Measuring fixture; 6. First magnetic component; 7. Calibration hole; 8. Reset and calibration mechanism; 9. Calibration shaft; 10. Drive loading mechanism; 11. Second magnetic component; 12. Force sensor; 13. Sliding assembly; 14. Rotating assembly; 15. Pull rod fixing seat; 16. Locking slider; 17. Locking handle; 18. Slider mounting seat; 19. Pointer; 20. Rotating component; 21. Fixing plate; 22. Reset drive mechanism; 23. Reset sliding platform; 24. Reset support seat; 25. Mounting base; 26. Loading sliding platform; 27. Loading drive structure; 28. Loading mounting seat; 29. ​​Loading rod; 30. Permanent magnet; 31. Frame; 32. Adjusting block; 33. Spring pin; 34. Positioning pin; 35. Hinge bolt; 36. Rotating handle. Detailed Implementation

[0034] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this disclosure. Therefore, the drawings and description are to be considered exemplary in nature and not restrictive.

[0035] In the description of this disclosure, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this disclosure, "a plurality of" means two or more, unless otherwise explicitly specified.

[0036] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joint" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, electrical connections, or connections that allow for communication; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0037] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] The following disclosure provides numerous different embodiments or examples for implementing various structures of this disclosure. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this disclosure. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this disclosure, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0039] The preferred embodiments of this disclosure are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0040] Please see Figures 1 to 8As shown, the present invention provides a measuring device for measuring the starting friction torque of a miniature rolling bearing applied to a universal joint, comprising: a support structure 1, wherein an arc-shaped guide rail 2 is provided on the support structure 1; a clamping and positioning mechanism 3, disposed on the support structure 1, wherein a workpiece 4 to be measured is disposed on the clamping and positioning mechanism 3; a measuring fixture 5, disposed at the free end of the workpiece 4 to be measured, wherein a first magnetic element 6 is provided on the side wall of the measuring fixture 5, and a calibration hole 7 is provided at the bottom of the measuring fixture 5; a reset and calibration mechanism 8, disposed on the support structure 1, wherein the reset and calibration mechanism 8 includes a calibration shaft 9, the calibration shaft 9 cooperating with the calibration hole 7 for resetting the measuring fixture 5; two driving and loading mechanisms 10, symmetrically disposed on both sides of the measuring fixture 5 and located on the support structure 1, wherein a second magnetic element 11 is provided at the end of the driving and loading mechanism 10, and the driving and loading mechanism 10 drives the second magnetic element 11 to reciprocate on the support structure 1 and approach the measuring fixture 5; and a force sensor 12, disposed on the driving and loading mechanism 10.

[0041] By setting an arc-shaped guide rail 2 on the support structure 1, and setting a clamping and positioning mechanism 3 on the arc-shaped guide rail 2, the clamping and positioning mechanism 3 is used to clamp and position the workpiece 4 to be measured, ensuring the stability of the installation of the workpiece 4 to be measured, and enabling the measurement of the starting friction torque of the workpiece 4 in two rotational directions. At the same time, the setting of the arc-shaped guide rail 2 can increase the initial measurement position of the workpiece 4 to be measured in the same rotational direction, that is, enabling the workpiece 4 to be measured in different starting positions within the range of -30° to 30°. Furthermore, a measuring fixture 5 is set at the bottom of the workpiece 4 to be measured. The position of the measuring fixture 5 can be corrected by a reset and correction mechanism 8, that is, by using the correction shaft 9 of the reset and correction mechanism 8 to cooperate with the correction hole 7 of the measuring fixture, thereby realizing the correction and reset of the workpiece 4 to be measured. Then, the driving loading mechanism 10 drives the second magnetic component 11 to move on the support structure 1. The second magnetic component 11 approaches the first magnetic component 6 on the measuring fixture 5. The second magnetic component 11 and the first magnetic component 6 generate a repulsive force. When the generated repulsive force is greater than the maximum static friction force in the rotation direction of the part to be measured, the force sensor 12 measures the maximum static friction force of the part to be measured 4, thereby calculating the starting friction torque value.

[0042] The measuring device for the starting friction torque of the miniature rolling bearing applied to the universal joint has advantages such as high measurement accuracy, good repeatability of measurement results, and high degree of automation. It can measure the starting friction torque value in both rotational directions of the tie rod universal joint.

[0043] This device for measuring the starting friction torque of a miniature rolling bearing applied to a universal joint can measure the starting friction torque of the support bearing at the rotation center of the measured part 4 at different starting positions (-30° to 30°), and can measure the starting friction torque of the measured part 4 in both rotation directions. This device can also achieve slow loading of a small force, ensuring that the force sensor 12 can collect the maximum static friction force in the rotation direction of the measured part 4, thereby calculating the starting friction torque value at that position. Furthermore, this device can achieve tooling reset after unidirectional measurement, ensuring the continuity of multiple measurements.

[0044] Among them, the component to be measured 4 is a universal joint of the tie rod cross shaft; the first magnetic component 6 is a permanent magnet 30.

[0045] In some optional embodiments, the clamping and positioning mechanism 3 includes a sliding component 13 and a rotating component 14; wherein the sliding component 13 is disposed on the arc-shaped guide rail 2 and slides on the arc-shaped guide rail 2; the rotating component 14 is disposed on the sliding component 13 and a pull rod fixing seat 15 is provided on the rotating component 14, and the part to be measured 4 is disposed on the pull rod fixing seat 15.

[0046] By setting the sliding component 13 on the arc-shaped guide rail 2, the rotating component 14 is moved on the arc-shaped guide rail 2 using the sliding component 13, allowing the measured part 4 to be measured at different starting measurement positions (-30° to 30°) in the same rotation direction. Simultaneously, the rotating component 14 allows the measured part 4 to rotate, enabling the measurement of the starting friction torque in both rotation directions. The pull rod fixing seat 15 secures the measured part 4 and installs it in the optimal position.

[0047] In some optional embodiments, the sliding assembly 13 includes a locking slider 16 and a slider mounting base 18; wherein the locking slider 16 is slidably disposed on the arc-shaped guide rail 2, and a locking handle 17 is provided on the locking slider 16; the slider mounting base 18 is disposed on the locking slider 16, and the rotating assembly 14 is embedded in the slider mounting base 18.

[0048] The locking slider 16 is set on the arc-shaped guide rail 2. The locking slider 16 moves on the arc-shaped guide rail 2 to realize different starting measurement positions of the part to be measured 4 in the same rotation direction, from -30° to 30°. The pointer 19 is connected to the locking slider 16 by a screw and is used to indicate the angular position of the locking slider 16 on the arc-shaped guide rail 2.

[0049] Furthermore, it can measure the starting friction torque of the workpiece 4 in both rotational directions. When the locking slider 16 moves to a suitable position on the arc-shaped guide rail 2, the locking handle 17 is used to lock the locking slider 16, that is, to fix the locking slider 16 in this position, to prevent the locking slider 16 from moving randomly, and to ensure the stability of the workpiece during the measurement at this position.

[0050] Meanwhile, the slider mounting base 18 is set on the locking slider 16. The setting of the slider mounting base 18 provides a mounting platform for the rotating component 14, so that the rotating component 14 and the slider mounting base 18 form an integral part, ensuring the integrity of the movement of the sliding component 13.

[0051] The rotating handle 36 can rotate the workpiece 4 to be measured by 90°. Adjusting the angle of the locking slider 16 on the arc-shaped guide rail 2 can change the initial angle of the workpiece 4 in the direction of rotation; and the spring pin 33 is used to lock the position of the pull rod fixing seat 15.

[0052] The slider mounting base 18 and the locking slider 16 are connected by bolts, and the fixing plate 21 and the slider mounting base 18 are connected by bearing interference fit. The slider mounting base 18 has three grooves spaced 90° apart. The position of the rotation center of the measured workpiece can be changed by directly rotating the handle to drive the pull rod fixing base 15. Rotating the handle 36 to the left or right can change the rotation direction of the measured workpiece 4 during measurement.

[0053] The end of the measuring part is fixed to the tie rod base 15 by the positioning pin 34 and the hinge bolt 35. During the rotation, the spring pin 33 plays a positioning role to ensure that the rotation center of the measuring part 4 is accurately changed.

[0054] In some optional embodiments, the sliding assembly 13 further includes multiple sliders (not shown in the figure), which are disposed on the arc-shaped guide rail 2 and connected to the locking slider 16.

[0055] The sliding component assists in the sliding of the locking slider 16, making the sliding of the locking slider 16 smoother.

[0056] Among them, the sliding component is a pulley, and there are four sliding components, which are symmetrically arranged on the inner and outer rails of the arc-shaped guide rail 2.

[0057] In some optional embodiments, the rotating assembly 14 includes a rotating element 20 and a fixed plate 21; wherein the rotating element 20 is disposed within the slider mounting base 18, and a rotating handle 36 is provided on the rotating element 20; the fixed plate 21 is disposed at the bottom of the rotating element 20, and the pull rod fixing base 15 is disposed on the fixed plate 21.

[0058] The rotating component 20 is installed inside the slider mounting base 18. The rotating handle 36 drives the rotating component 20 to rotate inside the slider mounting base 18. At the same time, a fixing plate 21 is set at the bottom of the rotating component 20. The fixing plate 21 is provided with a positioning pin 34. The part to be measured 4 is set on the positioning pin 34. Then, the part to be measured 4 is fixed by the pull rod fixing base 15, thus completing the installation of the part to be measured 4.

[0059] Among them, the rotating component 20 is a bearing.

[0060] In some optional embodiments, the reset correction mechanism 8 includes a reset drive mechanism 22, a reset sliding platform 23, and a reset support 24; wherein the reset drive mechanism 22 is connected to the reset sliding platform 23; the reset support 24 is disposed on the reset sliding platform 23, and the correction shaft 9 is disposed on the reset support 24.

[0061] The reset sliding platform 23 is connected to one end of the reset drive mechanism 22. The reset drive mechanism 22 is used to drive the reset sliding platform to move. The reset sliding platform drives the reset support 24 to move up and down, so that the correction shaft 9 on the reset support 24 cooperates with the correction hole 7 on the measuring fixture 5, thus completing the reset of the measuring fixture 5 and the workpiece 4 to be measured.

[0062] The reset drive mechanism 22 is connected to the lead screw in the reset sliding platform via a coupling. The reset support 24 is fixedly connected to the nut in the reset sliding platform. The calibration shaft 9 is tightly connected to the reset support 24 via a thread. The measuring fixture 5 has four permanent magnets 30 spaced 90° apart on its side as force loading points. After one starting friction torque measurement is completed on one of the rotating shafts of the workpiece 4 to be measured, the measuring fixture 5 will deflect at a small angle around its rotation center. At this time, the reset drive mechanism 22 rotates, driving the calibration shaft 9 upward through the reset sliding platform 23. The calibration shaft 9 gradually forms a clearance fit with the calibration hole 7 in the measuring fixture 5, allowing the measuring fixture 5 to return to its initial position.

[0063] In some optional embodiments, the drive loading mechanism 10 includes a mounting base 25, a loading sliding platform 26, and a loading mounting seat 28; wherein the mounting base 25 is disposed on the support structure 1, and the loading sliding platform 26 is provided on the mounting base 25, and a drive structure is provided at one end of the loading sliding platform 26; the loading mounting seat 28 is disposed on the loading sliding platform 26, and the second magnetic element 11 is disposed on the loading mounting seat 28.

[0064] By mounting the base 25, which is bolted to the support structure 1, the base 25 and the support structure 1 are integrated, ensuring the stability of the drive loading mechanism 10. Simultaneously, a loading sliding platform 26 is mounted on the base 25, also bolted to it. Driven by the loading drive structure 27, the loading sliding platform 26 reciprocates on the support structure 1, thus achieving the reciprocating motion of the loading rod 29. The second magnetic element 11 at the free end of the loading rod 29 repulses the first magnetic element 6, applying a force load to the measuring fixture 5. The force sensor 12 then measures the starting friction torque of the workpiece 4.

[0065] The loading drive structure 27 is connected to the lead screw inside the loading sliding platform 26 via a coupling. The loading mounting base 28 is fixedly connected to the nut of the loading sliding platform 26. The loading rod 29 is tightly connected to the loading mounting base 28 via a thread. The fixed end of the force sensor 12 is connected to the loading rod 29 via a thread, and the input end of the force sensor 12 is connected to the copper sleeve via a thread. The permanent magnet 30 is embedded in the copper sleeve. The loading drive structure 27 drives the lead screw of the loading sliding platform 26 to rotate, thereby causing the loading rod 29 to perform linear reciprocating motion. This causes the permanent magnet 30 at the input end of the force sensor 12 and the permanent magnet 30 on the measured tooling to generate a repulsive force, completing the process of applying force to the workpiece 4.

[0066] In some optional embodiments, the second magnetic component 11 includes a loading rod 29 and a permanent magnet 30; wherein the loading rod 29 is disposed on the loading mounting base 28, and the force sensor 12 is disposed on the free end of the loading rod 29; the permanent magnet 30 is disposed on the loading rod 29 and is placed at the input end of the force sensor 12.

[0067] The force sensor 12 has a copper sleeve on its input end, and the permanent magnet 30 is placed inside the copper sleeve, that is, the copper sleeve is used to position and install the permanent magnet 30.

[0068] Both the reset drive mechanism 22 and the drive loading mechanism 10 are motors.

[0069] In some optional embodiments, the support structure 1 includes a frame 31 and an adjustment block 32; wherein the arc-shaped guide rail 2, the reset and correction mechanism 8, and the drive loading mechanism 10 are disposed on the frame 31; and multiple adjustment blocks 32 are disposed at the bottom of the frame 31.

[0070] The frame 31 provides an installation platform for the arc-shaped guide rail 2, the reset and correction mechanism 8, and the drive loading mechanism 10. Meanwhile, the adjustment block 32 is located at the bottom of the frame 31, which supports the frame 31 and ensures its stability, thereby improving the accuracy of the measurement.

[0071] The present invention also provides a method for operating the measuring device for measuring the starting friction torque of a miniature rolling bearing applied to a universal joint, comprising: setting a measuring fixture 5 on the free end of the part to be measured 4, and setting the part to be measured 4 on the clamping and positioning mechanism 3; using the calibration shaft 9 on the reset and calibration mechanism 8 to cooperate with the calibration hole 7 at the bottom of the measuring fixture to calibrate the position of the part to be measured 4; then using the second magnetic element 11 on the drive loading mechanism 10 to reciprocate relative to the first magnetic element 6 on the measuring fixture 5, and using the force sensor 12 to detect the maximum static friction force of the part to be measured 4 in the rotation direction, thereby calculating the starting friction torque value in the rotation direction.

[0072] The specific working method of the measuring device for measuring the starting friction torque of a miniature rolling bearing applied to a universal joint is as follows: First, the measuring fixture 5 is installed on the bottom of the workpiece 4 to be measured. One end of the workpiece 4 is placed in the positioning pin 34, and the other end is fixed by the tie rod fixing seat 15 and the spring pin 35 to ensure accurate and stable installation of the workpiece 4. The reset drive mechanism 22 drives the reset sliding platform to move, and the reset sliding platform drives the reset support seat 24 to move up and down, so that the correction shaft 9 on the reset support seat 24 cooperates with the correction hole 7 on the measuring fixture 5, thus completing the reset of the measuring fixture 5 and the workpiece 4 to be measured.

[0073] The loading drive structure 27 drives the loading sliding platform 26 to reciprocate on the support structure 1, thereby realizing the reciprocating motion of the loading rod 29. The second magnetic component 11 on the free end of the loading rod 29 generates a repulsive force with the first magnetic component 6, which drives the measuring fixture 5 to rotate. Then, the force sensor 12 measures the starting friction torque of the part to be measured 4. The position of the measuring fixture 5 is then corrected by the reset and correction mechanism 8. Finally, the measurement is performed by the drive loading on the other side, thus completing one measurement.

[0074] The present invention also provides a measurement system for the starting friction torque of a miniature rolling bearing applied to a universal joint, including the aforementioned measuring device for the starting friction torque of a miniature rolling bearing applied to a universal joint.

[0075] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A measuring device for the starting friction torque of a miniature rolling bearing applied to a universal joint, characterized in that, include: Support structure (1), on which arc-shaped guide rail (2) is provided; A clamping and positioning mechanism (3) is provided on the support structure (1), and the clamping and positioning mechanism (3) is provided with a part to be measured (4); A measuring fixture (5) is provided at the free end of the workpiece (4) to be measured. A first magnetic component (6) is provided on the side wall of the measuring fixture (5), and a calibration hole (7) is provided at the bottom of the measuring fixture (5). The reset and correction mechanism (8) is located on the support structure (1). The reset and correction mechanism (8) includes a correction shaft (9), which cooperates with the correction hole (7) to reset the measuring fixture (5). Two drive loading mechanisms (10) are symmetrically arranged on both sides of the measuring fixture (5) and located on the support structure (1). The end of the drive loading mechanism (10) is provided with a second magnetic component (11). The drive loading mechanism (10) drives the second magnetic component (11) to reciprocate on the support structure (1) and approach the measuring fixture (5). A force sensor (12) is mounted on the drive loading mechanism (10).

2. The measuring device for measuring the starting friction torque of a miniature rolling bearing applied to a universal joint according to claim 1, characterized in that, The clamping and positioning mechanism (3) includes: A sliding component (13) is provided on the arc-shaped guide rail (2), and the sliding component (13) slides on the arc-shaped guide rail (2); A rotating component (14) is provided on a sliding component (13), and a tie rod fixing seat (15) is provided on the rotating component (14), and the part to be measured (4) is provided on the tie rod fixing seat (15).

3. The measuring device for measuring the starting friction torque of a miniature rolling bearing applied to a universal joint according to claim 2, characterized in that, The sliding component (13) includes: A locking slider (16) is slidably mounted on an arc-shaped guide rail (2), and a locking handle (17) is provided on the locking slider (16); A slider mounting base (18) is provided on the locking slider (16), and a rotating component (14) is embedded in the slider mounting base (18).

4. The measuring device for measuring the starting friction torque of a miniature rolling bearing applied to a universal joint according to claim 3, characterized in that, The sliding assembly (13) also includes multiple sliders, which are disposed on the arc-shaped guide rail (2) and connected to the locking slider (16).

5. The measuring device for measuring the starting friction torque of a miniature rolling bearing applied to a universal joint according to claim 4, characterized in that, The rotating assembly (14) includes: A rotating component (20) is provided inside the slider mounting base (18), and a rotating handle is provided on the rotating component (20); A fixing plate (21) is located at the bottom of the rotating part (20) and is connected to the rotating part (20) by screws, and a tie rod fixing seat (15) is located on the fixing plate (21).

6. The measuring device for measuring the starting friction torque of a miniature rolling bearing applied to a universal joint according to claim 5, characterized in that, Reset and calibration mechanism (8): A reset drive mechanism (22) is connected to a reset sliding platform (23); The reset support (24) is located on the reset sliding platform (23), and the correction shaft (9) is located on the reset support (24).

7. The measuring device for measuring the starting friction torque of a miniature rolling bearing applied to a universal joint according to claim 6, characterized in that, The drive loading mechanism (10) includes: A mounting base (25) is provided on the support structure (1), and a loading sliding platform (26) is provided on the mounting base (25), and a loading drive structure (27) is provided at one end of the loading sliding platform (26); A loading mounting base (28) is provided on a loading sliding platform (26), and a second magnetic component (11) is provided on the loading mounting base (28).

8. The measuring device for measuring the starting friction torque of a miniature rolling bearing applied to a universal joint according to claim 7, characterized in that, The second magnetic component (11) includes: A loading rod (29) is mounted on a loading mounting base (28), and a force sensor (12) is mounted on the free end of the loading rod (29). A permanent magnet (30) is mounted on a loading rod (29) and placed at the input of a force sensor (12).

9. A method for operating the measuring device for measuring the starting friction torque of a miniature rolling bearing applied to a universal joint according to any one of claims 1-8, characterized in that, include: A measuring fixture (5) is set on the free end of the workpiece (4) to be measured, and the workpiece (4) to be measured is set on the clamping and positioning mechanism (3). The position of the workpiece (4) to be measured is corrected by using the correction shaft (9) on the reset correction mechanism (8) to cooperate with the correction hole (7) at the bottom of the measuring fixture. Then, the second magnetic component (11) on the drive loading mechanism (10) is used to reciprocate relative to the first magnetic component (6) on the measuring fixture (5), and the maximum static friction force of the workpiece (4) to be measured in the rotation direction is detected by the force sensor (12), thereby calculating the starting friction torque value in the rotation direction.

10. A measurement system for the starting friction torque of a miniature rolling bearing applied to a universal joint, characterized in that, The measuring device for measuring the starting friction torque of a miniature rolling bearing applied to a universal joint, as described in any one of claims 1-8.

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