Truck hub maintenance-free bearing full working condition simulation tester

Abstract

The application discloses a truck hub maintenance-free bearing full working condition simulation testing machine, which comprises a tooling table, a servo driving system, a servo hydraulic system and a temperature control simulation system. The tooling table is provided with a tooling seat and a main shaft movably arranged on the tooling seat. The main shaft is detachably connected with a bearing to be tested between the tooling seat. The servo driving system is linked with the main shaft to simulate the actual operation working condition of the bearing. The tooling table is provided with a special-shaped load plate and a mandrel. The special-shaped load plate is linked with the mandrel, and the mandrel is detachably connected with an inner ring shaft hole of the bearing to be tested. The servo driving system is linked with the special-shaped load plate to simulate the load working condition of the bearing in actual operation. The temperature control simulation system is linked with the bearing to be tested to simulate the actual temperature working condition of the bearing. The application solves the problem that there is no testing device for simulating the multi-working condition test of the truck hub bearing in the prior art.

Description

Technical Field

[0001] This invention relates to the field of bearing testing equipment technology, specifically to a full-condition simulation testing machine for maintenance-free truck wheel hub bearings. Background Technology

[0002] In the commercial truck sector, the performance of maintenance-free bearings for truck wheel hubs is directly related to the safety, durability, and reliability of vehicle operation. To ensure the stability of bearings under actual working conditions, multi-dimensional performance tests are required through simulation experiments. However, existing bearing testing devices generally have significant drawbacks: most testing machines on the market can only meet the testing needs of a single working condition, such as simulating a single temperature environment, a single-direction load, or a specific operating speed. If it is necessary to comprehensively test the performance of bearings under complex working conditions (such as alternating high and low temperatures, combined radial and axial loads, etc.), it is often necessary to configure multiple testing machines with different functions. This not only leads to high equipment investment costs and occupies a large amount of testing space, but also makes the testing process cumbersome and inefficient.

[0003] Furthermore, the structural design of existing testing devices lacks comprehensive consideration, making it difficult to accurately simulate the complex operating conditions of bearings in actual operation. For example, some devices cannot simultaneously perform coordinated testing of temperature control, multi-directional load application, and rotational motion, resulting in deviations between test results and actual operating conditions. This fails to provide comprehensive and reliable data support for bearing design optimization. At the same time, existing technologies lack testing devices that can integrate multiple testing functions, making it difficult to meet the performance evaluation needs of maintenance-free commercial truck wheel hub bearings under all operating conditions. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a full-condition simulation testing machine for maintenance-free truck wheel hub bearings, thus solving the problem of the lack of a testing device for multi-condition simulation testing of truck wheel hub bearings in the existing technology.

[0005] To achieve the above objectives, this invention provides a full-condition simulation testing machine for maintenance-free truck wheel hub bearings, comprising a tooling table, a servo drive system, a servo hydraulic system, and a temperature control simulation system. The tooling table is equipped with a tooling base and a spindle movably mounted on the tooling base. A bearing to be tested is detachably connected between the spindle and the tooling base. The servo drive system works in conjunction with the spindle to rotate the spindle and drive the outer ring of the bearing to be tested to rotate synchronously, simulating the actual operating conditions of the bearing. The tooling table is equipped with a shaped load plate and a mandrel. The shaped load plate works in conjunction with the mandrel, and the mandrel is inserted into the inner ring shaft hole of the bearing to be tested and is detachably connected. The servo drive system works in conjunction with the shaped load plate and applies axial, radial, or combined loads to the bearing to be tested through the shaped load plate and the mandrel to simulate the actual load conditions experienced by the bearing during operation. The temperature control simulation system works in conjunction with the bearing to be tested and regulates the ambient temperature of the bearing to simulate the actual temperature conditions of the bearing.

[0006] The advantages of adopting the above technical solution are as follows: The testing machine integrates a tooling table, a servo drive system, a servo hydraulic system, and a temperature control simulation system. The servo drive system drives the spindle to rotate the outer ring of the bearing, simulating actual operating conditions. The servo hydraulic system applies axial, radial, or combined loads to the inner ring of the bearing via a shaped load plate and a mandrel, accurately reproducing the actual stress state of the bearing, thus simulating the load conditions experienced by the bearing during actual operation. The temperature control simulation system regulates the bearing's ambient temperature, achieving full-condition simulation. The tooling table can be detachably connected to the bearing under test, facilitating quick replacement of test pieces. These technical features address the problem of limited functionality in existing equipment, meet multi-condition testing needs, and improve testing efficiency and the accuracy of condition reproduction.

[0007] The invention further comprises: a transition plate rotatably mounted on the irregularly shaped load plate; a connecting hole is opened on the initial end face of the transition plate; the inner peripheral wall of the connecting hole is detachably connected to the outer ring of the bearing to be tested; a centering shaft is coaxially connected to the initial end of the main shaft; the end of the transition plate is coaxially connected to the centering shaft; the irregularly shaped load plate is composed of a horizontal part and a vertical part connected perpendicularly to each other, and the combined radial cross section of the horizontal and vertical parts is arranged in a "T" shape; the servo hydraulic system includes an axial loading structure and two sets of radial loading structures; the axial loading structure is linked with the vertical part to apply an axial load to the irregularly shaped load plate; the two radial loading structures are respectively located at both ends of the horizontal part and are linked with the horizontal part to apply a radial load to the irregularly shaped load plate.

[0008] The advantages of adopting the above technical solution are as follows: In the above technology, the irregular load plate adopts a "T"-shaped structure with the horizontal and vertical parts vertically connected. The two ends of the horizontal part are adapted to two sets of radial loading structures, and the two vertical parts are adapted to axial loading structures, so as to realize the coordinated application of multi-directional loads. The transition plate connects the outer ring of the bearing and the centering shaft of the main shaft to ensure stable transmission of operating power. In the above technology, the radial loading structure is set at both ends of the horizontal part, which can apply radial loads on both sides simultaneously. The axial loading structure works with the vertical part to apply axial loads. The simulation realism is improved through the coordinated action of multiple loads. Furthermore, the load transmission path is optimized through the "T"-shaped structure to enhance structural stability.

[0009] The present invention further comprises: a frame plate provided on the tooling table; the axial loading structure includes an axial loading cylinder movably mounted on the frame plate and an axial loading shaft coaxially connected to the output end of the axial loading cylinder; an axial base is hinged to the end of the axial loading shaft; and the axial base is detachably connected to the back of the vertical part.

[0010] The advantages of adopting the above technical solution are as follows: the frame plate set on the tooling table is perpendicular to the tooling table, providing a stable support foundation for the axial loading structure; the axial loading cylinder is movably set on the frame plate, and its output end is hinged to the axial base through the axial loading shaft, which can adapt to the small angle changes of the vertical part of the irregular load plate during the load application process, avoiding stress concentration caused by rigid connection. At the same time, the axial base and the back of the vertical part are detachably connected, which facilitates the rapid assembly and adjustment of the axial loading structure and the irregular load plate, improving the efficiency of test preparation. The above technology, through the linear drive characteristics of the axial loading cylinder and the coaxial transmission design of the axial loading shaft, can ensure the accuracy of the direction of axial load application and the stability of the force value, effectively simulating the axial force conditions experienced by the bearing in actual operation. The linkage between the support structure of the frame plate and the axial loading components jointly ensures the reliability of the axial load application process and the realism of the simulated working conditions.

[0011] The invention further comprises: the frame plate is arranged perpendicularly to the tooling table, and an adjustment groove is formed on the frame plate along its height direction; an adjustment base is hinged to the end of the axial loading cylinder; the adjustment base is slidably disposed in the adjustment groove; a lead screw shaft is rotatably disposed in the adjustment groove; a through hole for the lead screw shaft to pass through is formed on the adjustment base; the through hole is threadedly engaged with the lead screw shaft; a drive motor is provided on the frame plate for driving the lead screw shaft to rotate so as to drive the adjustment base to slide along the opening direction of the adjustment groove; the output end of the drive motor is coaxially connected to the lead screw shaft.

[0012] The advantages of adopting the above technical solution are as follows: The adjustment groove along the height direction on the support plate provides a sliding path for the adjustment base, allowing adjustment of the axial loading cylinder's height position according to the bearing specifications or test requirements. The threaded connection between the adjustment base and the lead screw shaft, driven by a motor, enables precise displacement control of the adjustment base. Compared to manual adjustment, this significantly improves the accuracy and efficiency of height adjustment. The coaxial connection design between the drive motor and the lead screw shaft ensures direct and stable power transmission, reducing energy loss during transmission. The coordinated operation of the adjustment groove, adjustment base, lead screw shaft, and drive motor allows the axial loading structure to adapt to different sized, irregularly shaped load plates or bearings under test, expanding the testing machine's applicability. The automated design of this adjustment structure reduces manual operation intensity and improves the consistency of axial load application position, providing reliable assurance for comparing results under different test conditions.

[0013] The present invention further comprises: the radial loading structure including a radial loading shaft and a radial loading cylinder for driving the radial loading shaft to move up and down; the radial loading cylinder is located below the tooling table; and the radial loading shaft is perpendicular to and connected to the horizontal part.

[0014] The advantages of adopting the above technical solution are as follows: The radial loading shaft of the radial loading structure is vertically connected to the horizontal part, ensuring the orthogonality of the radial load application direction with the horizontal part and avoiding simulation errors caused by load direction deviation. The radial loading cylinder is positioned below the fixture, optimizing the spatial layout of the testing machine, reducing interference with the testing area above the fixture, and facilitating the installation and observation of the bearing and related components under test. Simultaneously, the structural design of the radial loading cylinder driving the radial loading shaft to rise and fall enables dynamic application of radial loads, meeting the simulation requirements of radial force changes with operating conditions during actual bearing operation. The connection method between the radial loading shaft and the horizontal part ensures direct load transfer. Combined with the precise driving capability of the radial loading cylinder, this effectively improves the accuracy and stability of radial load simulation. Through the coordinated work of the radial loading cylinder positioned below and the vertically connected radial loading shaft, balanced radial support is provided to the horizontal part of the irregularly shaped load plate, ensuring structural stability during load application.

[0015] The invention further includes the following: the radial loading structure also includes a right-angle conversion component, which consists of a conversion base, a rotating shaft, and a right-angle plate. The right-angle plate is formed by a horizontal plate and a vertical plate connected perpendicularly to each other, and the radial cross-section of the right-angle plate is arranged in an "L" shape. The rotating shaft passes through the connection between the horizontal plate and the vertical plate. The conversion base is located below the tooling table, and the rotating shaft is rotatably connected in the conversion base. The output end of the radial loading cylinder is connected perpendicularly to the vertical plate, and the end of the radial loading shaft is connected perpendicularly to the horizontal plate. A tensile and compressive load sensor is connected between the end of the radial loading shaft and the horizontal plate. The radial loading cylinder is a servo electro-hydraulic actuator.

[0016] The advantages of adopting the above technical solution are as follows: The conversion base of the right-angle conversion component is located below the tooling table, providing stable support for the rotating shaft and the right-angle plate. The "L"-shaped radial cross-section structure of the right-angle plate is rotatably connected to the conversion base via the rotating shaft, converting the vertical driving force of the radial loading cylinder into a horizontal load on the radial loading shaft, achieving efficient force direction conversion. The design of the radial loading cylinder output end being perpendicularly connected to the vertical plate of the right-angle plate and the radial loading shaft being perpendicularly connected to the horizontal plate ensures the clarity of the driving force transmission path and the accuracy of force value conversion. By placing a tensile / compressive load sensor between the radial loading shaft and the horizontal plate, the magnitude of the radial load can be monitored in real time, providing feedback data for load control and improving the accuracy of load application. The servo electro-hydraulic actuator, as the radial loading cylinder, features fast response speed and high control accuracy, and can simulate more complex radial load variation conditions. Through the cooperation of the right-angle conversion component and the servo electro-hydraulic actuator, the above technology expands the methods of applying radial loads, enabling the testing machine to more closely approximate the complex radial force scenarios in actual bearing operation.

[0017] The present invention further includes: the temperature control simulation system comprising a high and low temperature controller mounted on one side of the tooling table and an insulated chamber mounted on the tooling table; the irregularly shaped load plate and the bearing to be tested are both mounted in the insulated chamber; a temperature control pipeline connects the high and low temperature controller to the insulated chamber; and the high and low temperature controller adjusts the internal temperature of the insulated chamber through the temperature control pipeline to simulate the ambient temperature conditions during actual operation of the bearing.

[0018] The advantages of adopting the above technical solution are as follows: The insulated chamber of the temperature control simulation system encloses the irregularly shaped load plate and the bearing under test, reducing the interference of external ambient temperature on the test area and improving the stability of temperature control. The high and low temperature controller, connected to the insulated chamber via temperature control piping, enables precise temperature adjustment within the chamber, covering a wide temperature range from low to high, simulating the ambient temperature of the bearing under different climatic conditions or operating states. The design of the temperature control piping ensures the circulation of the temperature regulating medium, resulting in a more uniform temperature distribution within the insulated chamber and avoiding the influence of localized temperature deviations on the test results. Through the coordinated operation of the high and low temperature controller and the insulated chamber, the above technology allows for the setting of temperature change curves according to test requirements, simulating the dynamic temperature change process of the bearing over time or operating conditions during actual operation. The temperature simulation function of this system enhances the consistency between test conditions and actual operating conditions, providing a reliable basis for performance evaluation of bearings under different temperature environments. The high and low temperature controller mentioned above is existing technology. Existing high and low temperature controllers typically consist of a refrigeration system, a heating system, a control system, a circulation system, an insulation structure, a safety protection device, and auxiliary components. The refrigeration system includes a compressor, a condenser, an evaporator, and an expansion valve, which achieves the cooling function through refrigerant circulation. The heating system uses electric heating tubes, PTC elements, or electromagnetic heating devices, which work in conjunction with a temperature controller to regulate the temperature rise. Since high and low temperature controllers are existing technology, their structure and function will not be described in detail.

[0019] The present invention further includes: the servo drive system includes a servo motor, the servo motor is a permanent magnet servo motor, the output end of the servo motor is coaxial with the spindle and a torque sensor is connected between the output end of the servo motor and the spindle.

[0020] The advantages of adopting the above technical solution are as follows: The permanent magnet servo motor used in the servo drive system has the characteristics of high power density, fast response speed, and high control precision. It can accurately control the spindle speed and torque output to meet the rotation speed requirements of the bearing under different operating conditions. The torque sensor is connected between the output end of the servo motor and the spindle, which can monitor the output torque value in real time and provide feedback for the control of the servo motor, ensuring the stability and accuracy of the torque output. The collaborative work of the permanent magnet servo motor and the torque sensor realizes the precise control of the spindle operating parameters. It can simulate the speed or torque fluctuation conditions caused by load changes in the actual operation of the maintenance-free bearing of the truck wheel hub. The high dynamic response characteristics of this drive system can quickly track the speed curve set in the test, improve the efficiency of the simulation test and the reliability of the results. Compared with traditional drive motors, the energy-saving characteristics of the permanent magnet servo motor can also reduce the operating energy consumption of the testing machine.

[0021] The present invention further includes: two test seats are arranged opposite each other on the tooling table, and each of the two test seats has a through hole for the main shaft to pass through. The two through holes are coaxially arranged, and a test bearing is connected between the outer peripheral wall of the main shaft and the inner peripheral wall of the two through holes. The test bearing is a paired tapered roller bearing.

[0022] The advantages of adopting the above technical solution are as follows: In the above technology, the two test seats arranged opposite each other on the tooling table support the spindle through coaxial through holes, ensuring the coaxiality of the spindle during operation and reducing vibration and error caused by support misalignment. The test bearings are paired tapered roller bearings, which can simultaneously bear radial and axial loads, improve the support capacity of the spindle, and ensure the smooth operation of the spindle. The symmetrical layout of the two test seats makes the load distribution of the spindle more uniform, reduces the stress on a single test bearing, and extends its service life. The pre-tightening installation method of the paired tapered roller bearings can reduce the operating clearance, improve the rotational accuracy of the spindle, and ensure the consistency of the outer ring of the bearing under test and the spindle in synchronous operation.

[0023] The present invention further includes: a lubricating oil tank is provided below the tooling table, and the lubricating oil tank is linked and connected to two test seats and a lubricating oil circulation passage to enable the lubricating oil tank to provide circulating lubricating oil to the spindle surface.

[0024] The advantages of adopting the above technical solution are as follows: The lubricating oil tank located below the tooling table is connected to two test seats via a lubricating oil circulation path, continuously supplying lubricating oil to the spindle surface and test bearings. This reduces frictional losses during operation, extends the service life of the spindle and test bearings, and the circulating flow of lubricating oil carries away heat generated by friction, providing cooling and preventing component deformation or lubrication failure due to excessive temperature. The design of the lubricating oil circulation path ensures the cleanliness of the lubricating oil, removing impurities through a filtration device and reducing abrasive wear damage to components. The continuous oil supply capacity of the lubricating oil tank can meet the needs of long-term testing, avoiding test interruptions due to manual oil replenishment and improving testing efficiency. The above lubrication system optimizes the operating environment of the spindle and test bearings, ensuring the reliability and stability of the testing machine under high load and long-term operating conditions, indirectly improving the accuracy of the simulated test results of the bearings under test. The lubricating oil tank in the above technology is existing technology, including a pump body for circulating and transporting lubricating oil. Since it is existing technology, its structure and function will not be described in detail. Attached Figure Description

[0025] Figure 1 This is a three-dimensional view of the present invention;

[0026] Figure 2 This is a three-dimensional view of the tooling table and its linkage components in this invention;

[0027] Figure 3This is a three-dimensional view of the irregularly shaped load plate and its linkage structure in this invention;

[0028] Figure 4 for Figure 3 sectional view;

[0029] Figure 5 This is a three-dimensional view of the test-taking seat and its linkage structure in this invention;

[0030] Figure 6 for Figure 5 sectional view;

[0031] Figure 7 This is a three-dimensional view of the radial loading cylinder and its linkage structure in this invention;

[0032] Figure 8 for Figure 7 A sectional view. Detailed Implementation

[0033] This invention provides a full-condition simulation testing machine for maintenance-free truck wheel hub bearings, including a fixture table 1, a servo drive system, a servo hydraulic system, and a temperature control simulation system. The fixture table 1 is equipped with a fixture base 11 and a spindle 12 movably mounted on the fixture base 11. A bearing 121 to be tested is detachably connected between the spindle 12 and the fixture base 11. The servo drive system works in conjunction with the spindle 12 to rotate the spindle 12 and drive the outer ring of the bearing 121 to rotate synchronously, simulating the actual operating conditions of the bearing. The fixture table 1 is equipped with a shaped load plate 2 and a mandrel 24. The shaped load plate 2 and the mandrel 24 are linked and the mandrel 24 is inserted into the inner ring shaft hole of the bearing 121 and is detachably connected. The servo drive system and... The irregularly shaped load plate 2 is linked and cooperates with the spindle 24 to apply axial, radial, or combined loads to the bearing 121 under test to simulate the actual load conditions of the bearing during operation. The temperature control simulation system is linked and cooperates with the bearing 121 under test to regulate the ambient temperature of the bearing 121 under test to simulate the actual temperature conditions of the bearing. A transition plate 21 is rotatably mounted on the irregularly shaped load plate 2. A connecting hole 211 is opened on the end face of the transition plate 21. The inner peripheral wall of the connecting hole 211 is detachably connected to the outer ring of the bearing 121 under test. A centering shaft 122 is coaxially connected to the beginning of the spindle 12. The end of the transition plate 21 is coaxially connected to the centering shaft 122. The irregularly shaped load plate 2 consists of a horizontal part 22 and a vertical part 23 facing each other. The system is vertically connected, with the horizontal part 22 and the vertical part 23 arranged in a "T"-shaped radial cross-section. The servo hydraulic system includes an axial loading structure and two sets of radial loading structures. The axial loading structure is linked with the vertical part 23 to apply an axial load to the irregularly shaped load plate 2. The two radial loading structures are located at both ends of the horizontal part 22 and are linked with the horizontal part 22 to apply a radial load to the irregularly shaped load plate 2. The tooling table 1 is equipped with a frame plate 13. The axial loading structure includes an axial loading cylinder 3 movably mounted on the frame plate 13 and an axial loading shaft 31 coaxially connected to the output end of the axial loading cylinder 3. An axial base 311 is hinged to the end of the axial loading shaft 31. The axial base 311 is detachably connected to the back of the vertical part 23. The frame plate 13 is perpendicular to the tooling table 1, and an adjustment groove 131 is formed on the frame plate 13 along its height direction. An adjustment base 32 is hinged to the end of the axial loading cylinder 3. The adjustment base 32 is slidably disposed in the adjustment groove 131. A lead screw shaft 33 is rotatably disposed in the adjustment groove 131. A through hole 321 for the lead screw shaft 33 to pass through is formed on the adjustment base 32. The through hole 321 is threadedly engaged with the lead screw shaft 33. A drive motor 34 is provided on the frame plate 13 for driving the lead screw shaft 33 to rotate so as to drive the adjustment base 32 to slide along the opening direction of the adjustment groove 131. The output end of the drive motor 34 is coaxially connected to the lead screw shaft 33.The radial loading structure includes a radial loading shaft 41 and a radial loading cylinder 4 for driving the radial loading shaft 41 to move up and down. The radial loading cylinder 4 is located below the tooling table 1. The radial loading shaft 41 is perpendicular to and connected to the horizontal part 22. The radial loading structure also includes a right-angle conversion component, which consists of a conversion base 42, a rotating shaft 43, and a right-angle plate 44. The right-angle plate 44 is formed by a horizontal plate 441 and a vertical plate 442 connected perpendicularly to each other, and the radial cross-section of the right-angle plate 44 is L-shaped. The rotating shaft 43 passes through the horizontal plate. The connection point between 441 and the vertical plate 442 is positioned such that the conversion base 42 is located below the tooling table 1, the rotating shaft 43 is rotatably connected to the conversion base 42, the output end of the radial loading cylinder 4 is perpendicularly connected to the vertical plate 442, the end of the radial loading shaft 41 is perpendicularly connected to the horizontal plate 441, a tensile / compressive load sensor 45 is connected between the end of the radial loading shaft 41 and the horizontal plate 441, the radial loading cylinder 4 is a servo electro-hydraulic actuator, and the temperature control simulation system includes a high / low temperature controller 51 located on one side of the tooling table 1. The test bearing 121 and the heat-insulating chamber 5 are set on the tooling table 1. The irregularly shaped load plate 2 and the test bearing 121 are both set in the heat-insulating chamber 5. The high and low temperature controller is connected to the heat-insulating chamber 5 by a temperature control pipeline 52. The high and low temperature controller 51 group adjusts the internal temperature of the heat-insulating chamber 5 through the temperature control pipeline 52 to simulate the ambient temperature conditions of the bearing during actual operation. The servo drive system includes a servo motor 6. The servo motor 6 is a permanent magnet servo motor 6. The output end of the servo motor 6 is coaxial with the spindle 12 and the output end of the servo motor 6 is parallel to the spindle 12. A torque sensor 61 is connected to the fixture 1. Two test seats 7 are arranged opposite each other on the fixture 1. Each test seat 7 has a through hole 71 for the main shaft 12 to pass through. The two through holes 71 are coaxially arranged. Test bearings 72, which are paired tapered roller bearings, are connected between the outer peripheral wall of the main shaft 12 and the inner peripheral wall of each of the two through holes 71. A lubricating oil tank is located below the fixture 1. The lubricating oil tank is linked to the two test seats 7 and connected to a lubricating oil circulation passage to provide circulating lubricating oil to the surface of the main shaft 12.

[0034] Operating procedure of this device:

[0035] 1. Experiment preparation phase:

[0036] Clamping the bearing to be tested: Insert and fix the inner ring shaft hole of the bearing to be tested with the mandrel, and detachably connect the outer ring to the transition plate through the transition plate connection hole; connect the end of the transition plate to the centering shaft at the beginning of the spindle to ensure the coaxiality of the outer ring and the spindle; complete the detachable connection between the bearing and the tooling seat, and complete the clamping.

[0037] System initialization: Start the servo drive system, servo hydraulic system, temperature control simulation system, and lubricating oil circulation system; adjust the rotation of the lead screw shaft by the drive motor, causing the adjustment base to slide along the adjustment groove of the frame plate, and adjust the height position of the axial loading cylinder so that the axial base at the end of the axial loading shaft is connected to the back of the vertical part of the irregular load plate; check the connection status of the right-angle conversion components (conversion base, rotating shaft, right-angle plate) of the radial loading structure, and ensure that the output end of the radial loading cylinder (servo electro-hydraulic actuator) is perpendicularly connected to the vertical plate of the right-angle plate, and that the radial loading shaft is connected to the horizontal plate through the tensile and compressive load sensors.

[0038] 2. Simulated Operation Phase:

[0039] Rotational operation simulation: The permanent magnet servo motor of the servo drive system starts and transmits power to the spindle through the torque sensor. The spindle drives the centering shaft, transition plate and outer ring of the bearing under test to rotate synchronously. The paired tapered roller bearings on the two test seats support the spindle. The lubricating oil tank provides circulating lubricating oil to the surface of the spindle and the test bearing through the lubricating oil circulation channel to reduce friction loss and remove heat, ensuring the smooth operation of the spindle.

[0040] Load condition simulation:

[0041] Axial load application: The axial loading cylinder of the servo hydraulic system is activated, and the output end pushes the axial base through the axial loading shaft to apply axial force to the vertical part of the irregular load plate. The force is transmitted to the inner ring of the bearing under test through the mandrel to simulate the axial force in the actual operation of the bearing.

[0042] Radial load application: The radial loading cylinder (servo electro-hydraulic actuator) is activated, and the output end drives the vertical plate of the right-angle plate. The vertical driving force is converted into a horizontal load through the rotation of the shaft. The load is transmitted to the radial loading shaft through the horizontal plate and the tensile and compressive load sensors. The radial loading shaft is vertically connected to the horizontal part of the irregular load plate and applies radial force to both ends of the horizontal part. The force is transmitted to the inner ring of the bearing under test through the mandrel, simulating radial or combined load conditions. The axial and radial loading structures can work independently or in combination to cover the simulation needs of multi-directional loads.

[0043] Temperature simulation: The high and low temperature control unit of the temperature control simulation system starts up and delivers hot / cold medium to the insulation box through the temperature control pipeline to regulate the temperature inside the box (wide range from low temperature to high temperature); the insulation box seals the irregular load plate and the bearing under test to reduce external temperature interference, and the circulation system (fan, air duct) ensures uniform temperature distribution inside the box, dynamically simulating the ambient temperature changes during the actual operation of the bearing.

[0044] In the above technology, the insulation box can be equipped with a swing door so that the operator can open the door to keep the insulation box compartment open for disassembling and assembling the bearings.

[0045] In the above technology, a hydraulic pump station can be set on one side of the tooling table to provide power support to the axial loading cylinder and the radial loading cylinder. Since the hydraulic pump station is existing technology, its structure and linkage will not be described in detail. The hydraulic pump station is marked as 8 in the attached drawings of the specification.

[0046] The foregoing has shown and described the basic principles and main features of the present invention, as well as its advantages. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope. All such changes and modifications fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.

Claims

1. A full-condition simulation testing machine for maintenance-free truck wheel hub bearings, characterized in that: The system includes a tooling table, a servo drive system, a servo hydraulic system, and a temperature control simulation system. The tooling table has a tooling base and a spindle movably mounted on the tooling base. A bearing to be tested is detachably connected between the spindle and the tooling base. The servo drive system works in conjunction with the spindle to rotate the spindle and synchronously drive the outer ring of the bearing to be tested to simulate the actual operating conditions of the bearing. The tooling table also has a shaped load plate and a mandrel. The shaped load plate and the mandrel are linked and connected, and the mandrel is inserted into the inner ring shaft hole of the bearing to be tested and is detachably connected. The servo drive system works in conjunction with the shaped load plate and the mandrel... Axial loads, radial loads, or a combination thereof are applied to the bearing under test to simulate the actual load conditions experienced by the bearing during operation. The temperature control simulation system works in conjunction with the bearing under test and regulates the ambient temperature of the bearing to simulate the actual temperature conditions. A transition plate is rotatably mounted on the irregularly shaped load plate. A connecting hole is formed on the end face of the transition plate, and the inner circumferential wall of the connecting hole is detachably connected to the outer ring of the bearing under test. A centering shaft is coaxially connected to the beginning of the main shaft, and the end of the transition plate is coaxially connected to the centering shaft. The irregularly shaped load plate is composed of horizontal and vertical sections connected perpendicularly to each other, and the horizontal and vertical sections combine to form a radial cross-section. Arranged in a "T" shape, the servo hydraulic system includes an axial loading structure and two sets of radial loading structures. The axial loading structure is linked with the vertical section to apply an axial load to the irregularly shaped load plate. The two radial loading structures are located at both ends of the horizontal section and are linked with the horizontal section to apply a radial load to the irregularly shaped load plate. Each radial loading structure includes a radial loading shaft and a radial loading cylinder for driving the radial loading shaft to move up and down. The radial loading cylinder is located below the tooling table. The radial loading shaft is perpendicular to and connected to the horizontal section. It also includes a right-angle conversion component, which consists of a conversion base, a rotating shaft, and a right-angle plate. The right-angle plate is composed of a horizontal plate and a vertical plate connected perpendicularly to each other, and the radial cross-section of the right-angle plate is arranged in an "L" shape. The rotating shaft is located at the connection between the horizontal plate and the vertical plate. The conversion base is located below the tooling table, and the rotating shaft is rotatably connected in the conversion base. The output end of the radial loading cylinder is connected perpendicularly to the vertical plate, and the end of the radial loading shaft is connected perpendicularly to the horizontal plate. A tensile and compressive load sensor is connected between the end of the radial loading shaft and the horizontal plate. The radial loading cylinder is a servo electro-hydraulic actuator.

2. The truck wheel hub maintenance-free bearing full-condition simulation testing machine according to claim 1, characterized in that: The tooling table is provided with a frame plate. The axial loading structure includes an axial loading cylinder movably mounted on the frame plate and an axial loading shaft coaxially connected to the output end of the axial loading cylinder. An axial base is hinged to the end of the axial loading shaft. The axial base is detachably connected to the back of the vertical part.

3. The truck wheel hub maintenance-free bearing full-condition simulation testing machine according to claim 2, characterized in that: The frame plate is perpendicular to the tooling table and has an adjustment groove along its height direction. The end of the axial loading cylinder is hinged to an adjustment base, which is slidably disposed in the adjustment groove. A lead screw shaft is rotatably disposed in the adjustment groove. The adjustment base has a through hole for the lead screw shaft to pass through, and the through hole is threadedly engaged with the lead screw shaft. The frame plate is equipped with a drive motor for driving the lead screw shaft to rotate so as to drive the adjustment base to slide along the opening direction of the adjustment groove. The output end of the drive motor is coaxially connected to the lead screw shaft.

4. The truck wheel hub maintenance-free bearing full-condition simulation testing machine according to claim 1, characterized in that: The temperature control simulation system includes a high and low temperature controller installed on one side of the tooling table and an insulated chamber installed on the tooling table. The irregular load plate and the bearing to be tested are both installed in the insulated chamber. A temperature control pipeline connects the high and low temperature controller to the insulated chamber. The high and low temperature controller adjusts the internal temperature of the insulated chamber through the temperature control pipeline to simulate the ambient temperature conditions of the bearing during actual operation.

5. The truck wheel hub maintenance-free bearing full-condition simulation testing machine according to claim 1, characterized in that: The servo drive system includes a servo motor, which is a permanent magnet servo motor. The output end of the servo motor is coaxial with the spindle, and a torque sensor is connected between the output end of the servo motor and the spindle.

6. The truck wheel hub maintenance-free bearing full-condition simulation testing machine according to claim 1, characterized in that: Two test seats are arranged opposite each other on the tooling table. Each of the two test seats has a through hole for the main shaft to pass through. The two through holes are coaxially arranged. Test bearings are connected between the outer peripheral wall of the main shaft and the inner peripheral walls of the two through holes. The test bearings are paired tapered roller bearings.

7. The truck wheel hub maintenance-free bearing full-condition simulation testing machine according to claim 6, characterized in that: A lubricating oil tank is provided below the tooling table. The lubricating oil tank is linked to two test seats and connected to a lubricating oil circulation passage to provide circulating lubricating oil to the spindle surface.

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