Torque detection structure of truck hub maintenance-free bearing and detection method thereof

Abstract

The invention discloses a torque detection structure for a maintenance-free bearing of a truck hub, which comprises a loading disc, a mandrel and a tool sleeve, and is characterized in that the loading disc and the tool sleeve are respectively arranged at two ends of the mandrel, and a to-be-tested bearing is arranged between the tool sleeve and the mandrel; the starting end of the mandrel is detachably connected with a connecting structure used for fixing an inner ring of a to-be-tested bearing to the end of the mandrel, the loading disc is provided with a loading structure used for being in linkage fit with external loading equipment so as to transmit an axial load and a radial load to the mandrel, and an accompanying test sleeve is connected between the loading disc and the mandrel. An accompanying bearing is installed between the accompanying sleeve and the mandrel, and the mandrel is provided with a driving structure used for driving the mandrel to operate so as to enable the to-be-tested bearing and the accompanying bearing to operate synchronously and a detection structure used for detecting the torque value generated by the operation of the to-be-tested bearing. The problem that in the prior art, a detection tool used for simulating the actual operation working condition and the stress working condition of the truck hub bearing and detecting the torque value does not exist is solved.

Description

Technical Field

[0001] The invention relates to the technical field of wheel hub bearings, in particular to a torque detection structure of a maintenance-free bearing of a truck wheel hub. Background Art

[0002] The torque performance of maintenance-free truck wheel hub bearings is directly related to the safety and reliability of vehicle operation. Accurately testing the torque value after applying a load is a key step in evaluating bearing performance. However, existing technologies lack specialized testing equipment that can effectively simulate the actual operating conditions (such as axial and radial loads) and stress states of truck wheel hub bearings, making it difficult to truly reflect the torque characteristics of the bearings during actual use. Furthermore, even where relevant testing equipment exists, the torque value of the attached test bearing cannot be effectively separated from the torque value of the bearing being tested. This leads to inaccurate test results and makes it difficult to reliably evaluate the actual performance of the bearings. This poses significant difficulties in quality inspection and performance optimization of maintenance-free truck wheel hub bearings. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the present invention provides a torque detection structure and detection method for a maintenance-free bearing of a truck wheel hub, in order to solve the problem that the existing technology lacks a detection tooling for simulating the actual operating conditions and stress conditions of the truck wheel hub bearing and performing torque value detection.

[0004] To achieve the above-mentioned objectives, the present invention provides a torque detection structure for a maintenance-free bearing of a truck wheel hub, comprising a loading disc, a core shaft and a tooling sleeve, wherein the loading disc and the tooling sleeve are respectively installed at both ends of the core shaft, a bearing to be tested is installed between the tooling sleeve and the core shaft, a connecting structure for fixing the inner ring of the bearing to be tested to the end of the core shaft is detachably connected to the starting end of the core shaft, a loading structure for cooperating with an external loading device to transmit axial load and radial load to the core shaft is provided on the loading disc, a test sleeve is connected between the loading disc and the core shaft, a test bearing is installed between the test sleeve and the core shaft, a driving structure for driving the core shaft to operate so that the bearing to be tested and the test bearing operate synchronously, and a detection structure for detecting the torque value generated by the operation of the bearing to be tested is provided on the core shaft.

[0005] The benefits of adopting the above technical solution are as follows: the connection structure in the above technology can firmly fix the inner ring of the bearing to be tested, preventing loosening during operation and affecting the test stability, while the loading structure transmits axial and radial loads to the core shaft through the loading disk to accurately simulate the actual stress conditions. At the same time, the test sleeve and the test bearing cooperate to form a test system to reduce external interference. The drive structure then realizes the synchronous operation of the bearing to be tested and the test bearing to ensure the consistency of the test environment, thereby detecting the torque value in real time. The above overall structure solves the problem of lacking test fixtures that simulate actual working conditions and stress states, and improves the authenticity and reliability of the test.

[0006] The present invention further provides that: the loading disk is composed of a horizontal part and a vertical part, and the horizontal part and the vertical part are connected vertically relative to each other; the loading structure includes an axial loading connecting rod for cooperating with an external loading device to apply an axial load to the loading disk; the axial loading connecting rod is movably arranged on the vertical part and the axial loading connecting rod is arranged in the same direction as the core shaft.

[0007] The benefits of adopting the above technical solution are: in the above technology, the horizontal part and the vertical part of the loading disk are vertically connected to enhance the structural rigidity and improve the stability of load transmission, while the axial loading connecting rod is movably arranged in the vertical part and in the same direction as the core shaft, ensuring that the axial load is accurately transmitted along the axis of the core shaft, avoiding test errors caused by load offset, realizing the directional and stable application of the axial load, adapting to the linkage requirements of external loading equipment, and improving the accuracy and reliability of axial loading.

[0008] The present invention further provides: an adjustment component for adjusting the relative position between the axial loading connecting rod and the vertical part to simulate the wheel radius working condition when the wheel hub bearing is actually running is provided on the vertical part, the adjustment component includes a transmission screw and an adjustment seat movably arranged on the transmission screw, the transmission screw includes a screw shaft and a fixed seat, the fixed seat is arranged on the top wall of the vertical part and the screw shaft is rotatably connected to the fixed seat, a through hole for the screw shaft to pass through is opened on the adjustment seat, the through hole is arranged to cooperate with the screw shaft thread to realize the displacement of the adjustment seat along the axis direction of the screw shaft when the screw shaft rotates, the screw shaft is relatively perpendicular to the core shaft and the screw shaft is relatively parallel to the vertical part, and the axial loading connecting rod is movably connected to the adjustment seat.

[0009] The benefits of adopting the above technical solution are: the transmission screw of the adjustment component in the above technology cooperates with the adjustment seat thread, which can accurately adjust the position of the axial loading connecting rod. The screw shaft is perpendicular to the core shaft and parallel to the vertical part to ensure that the adjustment direction is stable and controllable. Through position adjustment, the force conditions under different wheel radii are accurately simulated, which fits the actual operation scenario, improves the diversity and authenticity of the test conditions, meets different detection needs, and enhances the adaptability and flexibility of the structure.

[0010] The present invention further provides: a swing groove is opened on the adjustment seat, a pin shaft is rotatably connected in the swing groove, a swing head is provided at the end of the axial loading connecting rod, the swing head is swingingly set in the swing groove along the opening direction of the swing groove, and the swing head is coaxially connected to the pin shaft.

[0011] The benefits of adopting the above technical solution are: the swing groove of the adjustment seat in the above technology cooperates with the pin shaft to realize the swing adjustment of the axial loading connecting rod, and the swing head swings along the swing groove and is coaxially connected to the pin shaft, which can adapt to the angle changes during the loading process, avoid additional stress generated by rigid connection, ensure smooth and unobstructed load transmission, reduce structural wear, and improve the stability of the loading process and the service life of the structure.

[0012] The present invention further provides that: the loading structure also includes two groups of radial loading connecting rods for cooperating with external loading equipment to apply radial load to the loading disk, both ends of the horizontal part are connected to a force-bearing axis, the force-bearing axis is arranged relative to the horizontal part perpendicularly, the two radial loading connecting rods correspond to the two force-bearing axes one by one and are arranged in coordination, and the load loading direction of the radial loading connecting rod is arranged relative to the force-bearing axis.

[0013] The benefits of adopting the above technical solution are: in the above technology, the two sets of radial loading connecting rods are arranged in a one-to-one correspondence with the horizontal force axis, ensuring that the radial load is evenly distributed, the force axis is perpendicular to the horizontal part, and the load direction of the radial loading connecting rod is perpendicular to the force axis, ensuring that the radial force transmission path is reasonable, avoiding test deviations caused by eccentric loads, realizing stable application of multi-directional radial loads, and improving the accuracy and reliability of radial load simulation.

[0014] The present invention is further provided with: a core shaft sleeve is sleeved on the outer peripheral wall of the core shaft end, the test sleeve is sleeved on the core shaft sleeve and the test bearing is installed between the test sleeve and the core shaft sleeve, a locking cover for stably connecting the core shaft sleeve and the core shaft is detachably connected between the core shaft sleeve and the end portion of the core shaft, a connecting bolt is connected between the locking cover and the core shaft, a first locking nut is threadedly connected on the outer peripheral wall of the core shaft sleeve, a rib is circumferentially opened on the outer peripheral wall of the core shaft sleeve, the rib and the first locking nut are combined to form a clamping limit for the inner ring of the test bearing, and the test bearing is a paired tapered roller bearing.

[0015] The benefits of adopting the above technical solution are: in the above technology, the core sleeve is stably connected to the core shaft through the locking cover, thereby enhancing the overall rigidity of the structure, and the rib and the first locking nut are combined to clamp and limit the inner ring of the test bearing, ensuring that it is installed firmly and without looseness, and the paired tapered roller bearing is adapted to the test working conditions, thereby improving the load-bearing capacity and operating stability, reducing the interference of the shaking of the test components on the test, and ensuring the structural stability and reliability of the test system.

[0016] The present invention is further provided with: the driving structure includes a servo motor and an accelerator for cooperating with the servo motor, the output end of the servo motor is coaxially aligned with the core shaft, a transmission shaft is connected to the outer wall of the locking cover, the transmission shaft is coaxially arranged with the core shaft, and a coupling is connected between the output end of the servo motor and the transmission shaft.

[0017] The benefits of adopting the above technical solution are: in the above technology, the servo motor and the accelerator cooperate to provide stable driving force to meet the power requirements of the core shaft operation, and the coaxial setting of the drive shaft and the core shaft ensures the coaxiality of power transmission, thereby reducing power loss, and the coupling connects the output end of the servo motor and the drive shaft to reduce vibration interference in power transmission, thereby achieving synchronous and stable operation of the core shaft and the bearings to be tested and the accompanying test, and ensuring drive accuracy and operation smoothness.

[0018] The present invention further provides that: the detection structure includes a torque sensor, and the torque sensor is installed on the transmission shaft to receive feedback torque values ​​when the core shaft is running and perform detection and analysis.

[0019] The benefits of adopting the above technical solution are: the torque sensor in the above technology is installed on the drive shaft to receive the torque value feedback from the core shaft in real time, shorten the signal transmission path, reduce signal loss, ensure the timeliness and accuracy of torque detection, provide reliable data support for the analysis of the torque value of the bearing to be tested, directly reflect the torque changes during operation, and improve the credibility and accuracy of the detection results.

[0020] The present invention further provides: the connection structure includes a second locking nut threadedly engaged with the outer peripheral wall of the starting end of the core shaft and a retaining ring circumferentially opened on the outer peripheral wall of the starting end of the core shaft, the retaining ring and the second locking nut cooperate to form a clamping limit for the inner ring of the bearing to be tested, and the tooling sleeve is connected to a flange for linkage cooperation with the main shaft of the external equipment to drive the tooling sleeve to rotate synchronously when the main shaft of the external equipment rotates.

[0021] The benefits of this technical solution are as follows: the retaining ring and the second locking nut cooperate to clamp and position the inner ring of the bearing under test, ensuring a secure and stable installation without displacement, preventing loosening during operation and affecting test accuracy. The flange of the tooling sleeve is linked to the spindle of the external equipment, achieving synchronous rotation of the outer ring of the bearing under test, accurately simulating the outer ring rotation conditions during actual operation, improving the compatibility of the structure with external equipment and the authenticity of the simulated operating conditions.

[0022] The present invention further provides: a testing method based on a torque detection structure of a truck wheel hub maintenance-free bearing, comprising the following steps: S1, drive the main shaft of the external device to rotate in the forward direction at a speed of V1 to drive the tooling sleeve to rotate synchronously through the flange, and the tooling sleeve drives the outer ring of the bearing to be tested to rotate synchronously when it is running, start the servo motor to drive the core shaft to rotate at a speed of V2, and the rotation direction of the core shaft is set in the same direction as the rotation direction of the flange. According to the requirements of the detection working condition, the external loading device is selectively driven to apply a load to the axial loading connecting rod or the radial loading connecting rod, so that the load is transmitted to the core shaft through the loading disk, and the torque sensor receives and detects the torque value fed back by the core shaft through the transmission shaft. At this time, the torque value detected by the torque sensor is T1=T2-T3, where T2 is the torque value generated by the operation of the bearing to be tested, and T3 is the torque value generated by the operation of the accompanying test bearing; S2, drive the main shaft of the external device to rotate forward at a speed of V1 to drive the tooling sleeve to rotate synchronously through the flange, and the tooling sleeve drives the outer ring of the bearing to be tested to rotate synchronously when it is running, start the servo motor to drive the core shaft to rotate at a speed of V2, and the rotation direction of the core shaft is set in the opposite direction of the rotation direction of the flange. According to the requirements of the detection working condition, the external loading device is selectively driven to apply a load to the axial loading connecting rod or the radial loading connecting rod, so that the load is transmitted to the core shaft through the loading disk, and the torque sensor receives and detects the torque value fed back by the core shaft through the transmission shaft. At this time, the torque value detected by the torque sensor is T1=T2+T3, wherein T2 is the torque value generated by the operation of the bearing to be tested, and T3 is the torque value generated by the operation of the accompanying test bearing; S3. Based on steps S1 and S2, the torque value detected by the torque sensor is the moment value generated by the bearing to be tested under axial load, radial load or combined load conditions.

[0023] The benefits of adopting the above technical solution are: the above detection process can effectively separate the torque values ​​of the bearing to be tested and the companion bearing through the torque difference during the same-direction rotation and the torque sum during the reverse rotation, eliminate the interference of the companion components, and combine the application of axial, radial or combined loads to truly simulate the actual stress conditions, ensuring that the test results can accurately reflect the torque characteristics of the bearing to be tested under different load conditions, improve the accuracy and reliability of the test results, and provide an effective basis for bearing performance evaluation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional view from the front perspective of the present invention; Figure 2 A three-dimensional view of the present invention from a reverse perspective; Figure 3 It is a side sectional view of the present invention. DETAILED DESCRIPTION

[0025] The present invention provides a torque detection structure for a maintenance-free bearing of a truck wheel hub, comprising a loading disc 1, a core shaft 2 and a tooling sleeve 3, wherein the loading disc 1 and the tooling sleeve 3 are respectively installed at both ends of the core shaft 2, a bearing to be tested 21 is installed between the tooling sleeve 3 and the core shaft 2, the starting end of the core shaft 2 is detachably connected with a connecting structure for fixing the inner ring of the bearing to be tested to the end of the core shaft 2, the loading disc 1 is provided with a loading structure for cooperating with an external loading device to transmit axial load and radial load to the core shaft 2, a test sleeve 4 is connected between the loading disc 1 and the core shaft 2, a test bearing 22 is installed between the test sleeve 4 and the core shaft 2, and the core shaft 2 is provided with a device for driving the core shaft 2 to operate so that the bearing to be tested 21 and the test bearing 22 move synchronously. The driving structure for rotation and the detection structure for detecting the torque value generated by the operation of the bearing to be tested 21, the loading disc 1 is composed of a horizontal part 11 and a vertical part 12, and the horizontal part 11 and the vertical part 12 are relatively vertically connected. The loading structure includes an axial loading connecting rod 5 for cooperating with an external loading device to apply an axial load to the loading disc 1, the axial loading connecting rod 5 is movably arranged on the vertical part 12, and the axial loading connecting rod 5 is arranged in the same direction as the core shaft 2. The vertical part 12 is provided with an adjustment component for adjusting the relative position between the axial loading connecting rod 5 and the vertical part 12 to simulate the wheel radius working condition during the actual operation of the hub bearing, the adjustment component includes a transmission screw and an adjustment seat 51 movably arranged on the transmission screw, the transmission The screw includes a screw shaft 52 and a fixed seat 53, the fixed seat 53 is arranged on the top wall of the vertical part 12 and the screw shaft 52 is rotatably connected to the fixed seat 53, the adjusting seat 51 is provided with a through hole 511 for the screw shaft 52 to pass through, the through hole 511 is threadedly matched with the screw shaft 52 to realize the displacement of the adjusting seat 51 along the axial direction of the screw shaft 52 when the screw shaft 52 rotates, the screw shaft 52 is relatively perpendicular to the core shaft 2 and the screw shaft 52 is relatively parallel to the vertical part 12, the axial loading connecting rod 5 is movably connected to the adjusting seat 51, the adjusting seat 51 is provided with a swing groove 512, the swing groove 512 is rotatably connected with a pin shaft 513, the end of the axial loading connecting rod 5 is provided with a swing head 514, the swing The head 514 is swung in the swing groove 512 along the opening direction of the swing groove 512, and the swing head 514 is coaxially connected to the pin shaft 513. The loading structure also includes two groups of radial loading connecting rods 6 for cooperating with external loading equipment to apply radial load to the loading disk 1. Both ends of the horizontal part 11 are connected to a force-bearing shaft 61, and the force-bearing shaft 61 is relatively perpendicular to the horizontal part 11. The two radial loading connecting rods 6 correspond to the two force-bearing shafts 61 one by one and are matched. The load loading direction of the radial loading connecting rod 6 is relatively perpendicular to the force-bearing shaft 61. A core shaft sleeve 23 is sleeved on the outer peripheral wall of the end of the core shaft 2, and the test sleeve 4 is sleeved on the core shaft sleeve 23 and the test bearing 22 is installed between the test sleeve 4 and the core shaft sleeve 23.The core shaft sleeve 23 and the end portion of the core shaft 2 are detachably connected with a locking cover 24 for stably connecting the core shaft sleeve 23 and the core shaft 2, and a connecting bolt 241 is connected between the locking cover 24 and the core shaft 2, and a first locking nut 25 is threadedly connected to the outer peripheral wall of the core shaft sleeve 23, and a rib 26 is circumferentially provided on the outer peripheral wall of the core shaft sleeve 23. The rib 26 and the first locking nut 25 are combined to form a clamping limit for the inner ring of the accompanying test bearing 22. The accompanying test bearing 22 is a paired tapered roller bearing, and the driving structure includes a servo motor 7 and an accelerator 71 for cooperating with the servo motor 7. The output end of the servo motor 7 is coaxially aligned with the core shaft 2, and a transmission shaft 242 is connected to the outer wall of the locking cover 24. The transmission shaft 242 is coaxially arranged with the core shaft 2. A coupling 72 is connected between the output end of the servo motor 7 and the transmission shaft 242. The detection structure includes a torque sensor 73, which is installed on the transmission shaft 242 to receive feedback torque values ​​when the core shaft 2 is running and perform detection and analysis. The connection structure includes a second locking nut 27 that is threadedly engaged with the outer peripheral wall of the starting end of the core shaft 2 and a retaining ring 28 circumferentially opened on the outer peripheral wall of the starting end of the core shaft 2. The retaining ring 28 cooperates with the second locking nut 27 to form a clamping limit for the inner ring of the bearing 21 to be tested. The tooling sleeve 3 is connected to a flange 29 for cooperating with the main shaft of the external device to drive the tooling sleeve 3 to rotate synchronously when the main shaft of the external device rotates.

[0026] A testing method based on the above technical structure includes the following steps: S1, drive the main shaft of the external device to rotate in the forward direction at a speed of V1 to drive the tooling sleeve to rotate synchronously through the flange, and the tooling sleeve drives the outer ring of the bearing to be tested to rotate synchronously when it is running, start the servo motor to drive the core shaft to rotate at a speed of V2, and ensure that the V1 value is more than ten times greater than the V2 value. The rotation direction of the core shaft is set in the same direction as the rotation direction of the flange. According to the requirements of the detection working condition, the external loading device is selectively driven to apply a load to the axial loading connecting rod or the radial loading connecting rod, so that the load is transmitted to the core shaft through the loading disk. The torque sensor receives and detects the torque value fed back by the core shaft through the transmission shaft. At this time, the torque value detected by the torque sensor is T1=T2-T3, wherein T2 is the torque value generated by the operation of the bearing to be tested, and T3 is the torque value generated by the operation of the accompanying test bearing; S2, drive the main shaft of the external device to rotate forward at a speed of V1 to drive the tooling sleeve to rotate synchronously through the flange, and the tooling sleeve drives the outer ring of the bearing to be tested to rotate synchronously when it is running, start the servo motor to drive the core shaft to rotate at a speed of V2, and the rotation direction of the core shaft is set in the opposite direction of the rotation direction of the flange. According to the requirements of the detection working condition, the external loading device is selectively driven to apply a load to the axial loading connecting rod or the radial loading connecting rod, so that the load is transmitted to the core shaft through the loading disk, and the torque sensor receives and detects the torque value fed back by the core shaft through the transmission shaft. At this time, the torque value detected by the torque sensor is T1=T2+T3, wherein T2 is the torque value generated by the operation of the bearing to be tested, and T3 is the torque value generated by the operation of the accompanying test bearing; S3. Based on steps S1 and S2, the torque value detected by the torque sensor is the moment value generated by the bearing to be tested under axial load, radial load or combined load conditions.

[0027] The overall operation process of the above technical structure: 1. Equipment assembly and fixation: Install the loading plate and tooling sleeve at both ends of the mandrel respectively, install the bearing to be tested between the tooling sleeve and the mandrel, and clamp and limit the inner ring of the bearing to be tested through the connection structure (the retaining ring and the second locking nut) to ensure its firm fixation; the test sleeve is set on the mandrel sleeve at the end of the mandrel, and install the test bearing between the test sleeve and the mandrel sleeve. Use the retaining edge and the first locking nut to clamp and limit the inner ring of the test bearing, and the locking cover stably connects the mandrel sleeve to the mandrel through the connecting bolts.

[0028] 2. Loading and driving connection: The force-bearing axes at both ends of the horizontal part of the loading disk are connected to the radial loading connecting rod, and the vertical part is installed with the axial loading connecting rod through the adjustment component (transmission screw, adjustment seat). The swing head at the end of the axial loading connecting rod is rotatably connected to the swing groove of the adjustment seat through the distribution shaft; the servo motor + accelerator is connected to the transmission shaft at the end of the core shaft through the coupling, the torque sensor is installed on the transmission shaft, and the tooling sleeve flange is linked to the main shaft of the external equipment.

[0029] 3. Test Operation: In the first step, the external device's main shaft rotates in the forward direction (V1), driving the tooling sleeve and the outer ring of the bearing to be tested through the flange. The servo motor drives the core shaft in the same direction (V2). The loading device applies load via the axial / radial loading connecting rods. The torque sensor detects the torque value (T1 = T2 - T3). In the second step, the external device's main shaft continues to rotate in the forward direction (V1), and the servo motor drives the core shaft in the reverse direction (V2). The loading device maintains the load application, and the torque sensor detects the torque value (T1 = T2 + T3). During operation, the external loading device can be selectively opened and closed according to test requirements. This allows the external loading device to apply load to the axial loading connecting rod, the radial loading connecting rod, or both simultaneously, thereby simulating the axial and radial load conditions experienced by the bearing during actual operation.

[0030] 4. Result acquisition: Based on the two-step test torque values, the moment values ​​of the bearing to be tested under axial, radial or combined load conditions are obtained separately.

[0031] The external loading device and the external device spindle described in the above technology are both existing technologies, so their structures and functions will not be described in detail.

[0032] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which shall fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A torque detection structure for a maintenance-free bearing on a truck wheel hub, characterized by: It includes a loading disc, a core shaft and a tooling sleeve, the loading disc and the tooling sleeve are respectively installed at both ends of the core shaft, a bearing to be tested is installed between the tooling sleeve and the core shaft, the starting end of the core shaft is detachably connected to a connecting structure for fixing the inner ring of the bearing to be tested to the end of the core shaft, the loading disc is provided with a loading structure for cooperating with an external loading device to transmit axial load and radial load to the core shaft, a test sleeve is connected between the loading disc and the core shaft, a test bearing is installed between the test sleeve and the core shaft, the core shaft is provided with a driving structure for driving the core shaft to operate so that the bearing to be tested and the test bearing can operate synchronously, and a detection structure for detecting the torque value generated by the operation of the bearing to be tested.

2. The torque detection structure of a maintenance-free bearing for a truck wheel hub according to claim 1, characterized in that: The loading disk is composed of a horizontal part and a vertical part, and the horizontal part and the vertical part are connected vertically relative to each other. The loading structure includes an axial loading connecting rod for cooperating with an external loading device to apply an axial load to the loading disk. The axial loading connecting rod is movably arranged on the vertical part and is arranged in the same direction as the core shaft.

3. The torque detection structure of a maintenance-free bearing for a truck wheel hub according to claim 2, characterized in that: The vertical part is provided with an adjustment component for adjusting the relative position between the axial loading connecting rod and the vertical part to simulate the wheel radius working condition when the wheel hub bearing is actually running. The adjustment component includes a transmission screw and an adjustment seat movably arranged on the transmission screw. The transmission screw includes a screw shaft and a fixed seat. The fixed seat is arranged on the top wall of the vertical part and the screw shaft is rotatably connected to the fixed seat. A through hole for the screw shaft to pass through is opened on the adjustment seat. The through hole is arranged in cooperation with the screw shaft thread to realize the displacement of the adjustment seat along the axis direction of the screw shaft when the screw shaft rotates. The screw shaft is relatively perpendicular to the core shaft and the screw shaft is relatively parallel to the vertical part. The axial loading connecting rod is movably connected to the adjustment seat.

4. The torque detection structure of a maintenance-free bearing for a truck wheel hub according to claim 3, characterized in that: The adjustment seat is provided with a swing groove, a pin shaft is rotatably connected in the swing groove, and a swing head is provided at the end of the axial loading connecting rod. The swing head is swung in the swing groove along the direction in which the swing groove is opened, and the swing head is coaxially connected to the pin shaft.

5. The torque detection structure of a maintenance-free bearing for a truck wheel hub according to claim 2, characterized in that: The loading structure also includes two groups of radial loading connecting rods for cooperating with external loading equipment to apply radial load to the loading disk. Both ends of the horizontal part are connected to a force-bearing axis, and the force-bearing axis is arranged perpendicularly to the horizontal part. The two radial loading connecting rods correspond to the two force-bearing axes one by one and are arranged in coordination. The load loading direction of the radial loading connecting rod is arranged perpendicularly to the force-bearing axis.

6. The torque detection structure of a maintenance-free bearing for a truck wheel hub according to claim 1, characterized in that: A core shaft sleeve is sleeved on the outer peripheral wall of the core shaft end, the test sleeve is sleeved on the core shaft sleeve and the test bearing is installed between the test sleeve and the core shaft sleeve, a locking cover is detachably connected between the core shaft sleeve and the end of the core shaft to stably connect the core shaft sleeve and the core shaft, a connecting bolt is connected between the locking cover and the core shaft, a first locking nut is threadedly connected on the outer peripheral wall of the core shaft sleeve, a rib is circumferentially opened on the outer peripheral wall of the core shaft sleeve, the rib and the first locking nut are combined to form a clamping limit for the inner ring of the test bearing, and the test bearing is a paired tapered roller bearing.

7. The torque detection structure of a maintenance-free bearing for a truck wheel hub according to claim 6, characterized in that: The driving structure includes a servo motor and an accelerator for cooperating with the servo motor. The output end of the servo motor is coaxially aligned with the core shaft. A transmission shaft is connected to the outer wall of the locking cover. The transmission shaft is coaxially arranged with the core shaft. A coupling is connected between the output end of the servo motor and the transmission shaft.

8. The torque detection structure for a maintenance-free bearing of a truck wheel hub according to claim 7, characterized in that: The detection structure includes a torque sensor, which is installed on the transmission shaft to receive feedback torque values ​​when the core shaft is running and perform detection and analysis.

9. The torque detection structure of a maintenance-free bearing for a truck wheel hub according to claim 1, characterized in that: The connecting structure includes a second locking nut that is threadedly engaged with the outer peripheral wall of the starting end of the core shaft and a retaining ring that is circumferentially opened on the outer peripheral wall of the starting end of the core shaft. The retaining ring and the second locking nut cooperate to form a clamping limit for the inner ring of the bearing to be tested. The tooling sleeve is connected to a flange that is used to cooperate with the main shaft of the external equipment to drive the tooling sleeve to rotate synchronously when the main shaft of the external equipment rotates.

10. A testing method for the torque detection structure of the truck wheel hub maintenance-free bearing according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1, drive the main shaft of the external device to rotate in the forward direction at a speed of V1 to drive the tooling sleeve to rotate synchronously through the flange, and the tooling sleeve drives the outer ring of the bearing to be tested to rotate synchronously when it is running, start the servo motor to drive the core shaft to rotate at a speed of V2, and the rotation direction of the core shaft is set in the same direction as the rotation direction of the flange. According to the requirements of the detection working condition, the external loading device is selectively driven to apply a load to the axial loading connecting rod or the radial loading connecting rod, so that the load is transmitted to the core shaft through the loading disk, and the torque sensor receives and detects the torque value fed back by the core shaft through the transmission shaft. At this time, the torque value detected by the torque sensor is T1=T2-T3, where T2 is the torque value generated by the operation of the bearing to be tested, and T3 is the torque value generated by the operation of the accompanying test bearing; S2, drive the main shaft of the external device to rotate forward at a speed of V1 to drive the tooling sleeve to rotate synchronously through the flange, and the tooling sleeve drives the outer ring of the bearing to be tested to rotate synchronously when it is running, start the servo motor to drive the core shaft to rotate at a speed of V2, and the rotation direction of the core shaft is set in the opposite direction of the rotation direction of the flange. According to the requirements of the detection working condition, the external loading device is selectively driven to apply a load to the axial loading connecting rod or the radial loading connecting rod, so that the load is transmitted to the core shaft through the loading disk, and the torque sensor receives and detects the torque value fed back by the core shaft through the transmission shaft. At this time, the torque value detected by the torque sensor is T1=T2+T3, wherein T2 is the torque value generated by the operation of the bearing to be tested, and T3 is the torque value generated by the operation of the accompanying test bearing; S3. Based on steps S1 and S2, the torque value detected by the torque sensor is the moment value generated by the bearing to be tested under axial load, radial load or combined load conditions.

Images