Full-working-condition simulation testing machine for maintenance-free bearing of truck hub

Abstract

The invention discloses a truck hub maintenance-free bearing all-condition simulation testing machine, which comprises a tool table, a servo driving system, a servo hydraulic system and a temperature control simulation system, and is characterized in that the tool table is provided with a tool seat and a main shaft movably arranged on the tool seat, and a to-be-tested bearing is detachably connected between the main shaft and the tool seat; the servo driving system is in linkage fit with the main shaft to simulate the actual operation condition of the bearing, the tool table is provided with a special-shaped load plate and a mandrel, the special-shaped load plate is in linkage fit with the mandrel, and the mandrel is inserted into an inner ring shaft hole of the bearing to be tested and is detachably connected with the inner ring shaft hole of the bearing to be tested. The servo driving system is in linkage cooperation with the special-shaped load plate to simulate the load working condition of the bearing during actual operation, and the temperature control simulation system is in linkage cooperation with the bearing to be tested to simulate the actual temperature working condition of the bearing. According to the invention, the problem that a test device for carrying out a multi-working-condition simulation test on a truck hub bearing is lacked in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of bearing test equipment, and particularly to a full-condition simulation test machine for a maintenance-free bearing of a truck hub. Background Art

[0002] In the field of commercial trucks, the performance of the maintenance-free bearing of the truck hub is directly related to the safety, durability and reliability of vehicle driving. To ensure the stability of the bearing under actual working conditions, multi-dimensional performance tests need to be carried out on it through simulation tests. However, there are generally significant defects in the existing bearing test devices: most of the existing test machines on the market can only meet the test requirements of a single working condition. For example, they can only simulate single conditions such as temperature environment, unidirectional load or specific running speed. If it is necessary to comprehensively test the performance of the bearing under complex working conditions (such as alternating high and low temperatures, combined radial and axial loads, etc.), it is often necessary to configure multiple test machines with different functions. This not only results in high equipment investment costs, occupies a large amount of test space, but also makes the test process cumbersome and inefficient.

[0003] In addition, the structural design of the existing test devices lacks comprehensive consideration and it is difficult to accurately simulate the composite working conditions of the bearing during actual operation. For example, some devices cannot simultaneously achieve the coordinated tests of temperature control, multi-directional load application and rotational movement, resulting in a deviation between the test results and the actual working conditions, and unable to provide comprehensive and reliable data support for the design optimization of the bearing. At the same time, there is a lack of a test device in the existing technology that can integrate multiple test functions, and it is difficult to meet the performance evaluation requirements of the maintenance-free bearing of the commercial truck hub under full-condition conditions. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, the present invention provides a full-condition simulation test machine for a maintenance-free bearing of a truck hub to solve the problem that there is a lack of a test device for multi-condition simulation tests on the bearing of a truck hub in the existing technology.

[0005] To achieve the above object, the present invention provides a full-condition simulation test machine for a maintenance-free bearing of a truck wheel hub, which includes a tooling table, a servo drive system, a servo hydraulic system, and a temperature control simulation system. A tooling seat and a main shaft movably arranged on the tooling seat are provided on the tooling table. A bearing to be tested is detachably connected between the main shaft and the tooling seat. The servo drive system is linked with the main shaft to make the main shaft rotate and drive the outer ring of the bearing to be tested to rotate synchronously to simulate the actual operating conditions of the bearing. An irregular load plate and a mandrel are provided on the tooling table. The irregular load plate is linked with the mandrel, and the mandrel is inserted and detachably connected to the inner ring shaft hole of the bearing to be tested. The servo drive system is linked with the irregular load plate and applies axial or radial or combined loads to the bearing to be tested through the irregular load plate and the mandrel to simulate the load conditions suffered by the bearing during actual operation. The temperature control simulation system is linked with the bearing to be tested and regulates the ambient temperature of the bearing to be tested to simulate the actual temperature conditions of the bearing.

[0006] The advantages of adopting the above technical solution are as follows: In the above technology, the test machine integrates a tooling table, a servo drive system, a servo hydraulic system, and a temperature control simulation system. The outer ring of the bearing can be driven by the servo drive system to rotate the main shaft to simulate the actual operating conditions. The servo hydraulic system applies axial, radial, or combined loads to the inner ring of the bearing through the irregular load plate and the mandrel to accurately restore the actual stress state of the bearing, thereby simulating the load conditions suffered by the bearing during actual operation. The ambient temperature of the bearing is regulated by the temperature control simulation system to achieve full-condition simulation. The tooling table is detachably connected to the bearing to be tested, which is convenient for quickly replacing the test piece. By setting the above technology, the problem of single function of existing equipment is solved, the multi-condition test requirements are met, and the test efficiency and condition restoration degree are improved.

[0007] The present invention is further provided with: A transition disk is rotatably arranged on the irregular load plate. A connection hole is provided on the end face of the starting end of the transition disk, and the inner peripheral wall of the connection hole is detachably connected to the outer ring of the bearing to be tested. A centering shaft is coaxially connected to the starting end of the main shaft, and the end of the transition disk is coaxially connected to the centering shaft. The irregular load plate is composed of a horizontal part and a vertical part connected perpendicular to each other, and the combined radial cross-section of the horizontal part and the vertical part is in a "T" shape. The servo hydraulic system includes an axial loading structure and two groups of radial loading structures. The axial loading structure is linked with the vertical part to apply an axial load to the irregular load plate through the axial loading structure. The two radial loading structures are respectively arranged at both ends of the horizontal part and are both linked with the horizontal part to apply a radial load to the irregular load plate through the radial loading structures.

[0008] The advantages of adopting the above technical solution are as follows: In the above technology, the special-shaped load plate adopts a "T"-shaped structure with a horizontal part and a vertical part perpendicularly connected. The two ends of the horizontal part are adapted to two groups of radial loading structures, and the two vertical parts are adapted to the axial loading structure, so as to realize the collaborative application of multi-directional loads; the transition disk connects the outer ring of the bearing and the centering shaft of the main shaft to ensure the stable transmission of the operating power; in the above technology, the radial loading structures are arranged at both ends of the horizontal part and can apply bilateral radial loads synchronously, while the axial loading structure cooperates with the vertical part to apply axial loads. The simulation authenticity is improved through the collaborative action of multiple loads, and then the load transmission path is optimized through the "T"-shaped structure to enhance the structural stability.

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

[0010] The advantages of adopting the above technical solution are as follows: In the above technology, the support plate arranged 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 arranged on the support plate, and its output end is hinged with the axial base through the axial loading shaft, which can adapt to the small angular changes of the vertical part of the special-shaped load plate during the load application process, avoiding stress concentration caused by rigid connection. At the same time, the axial base is detachably connected to the back surface of the vertical part, which is convenient for the rapid assembly and adjustment of the axial loading structure and the special-shaped load plate, improving the test preparation efficiency. Through the linear driving characteristic of the axial loading cylinder and the coaxial transmission design of the axial loading shaft, the direction accuracy and force value stability of the axial load application can be ensured, effectively simulating the axial force working conditions suffered by the bearing during actual operation. The support structure of the support plate and the linkage cooperation of the axial loading components jointly ensure the reliability of the axial load application process and the authenticity of the simulation working conditions.

[0011] The present invention is further provided with: the support plate is arranged perpendicular to the tooling table, and an adjustment groove is opened along the height direction of the support plate. The end of the axial loading cylinder is hinged with an adjustment base, and the adjustment base is slidably arranged in the adjustment groove. A lead screw shaft is rotatably arranged in the adjustment groove. A through hole for the lead screw shaft to pass through is opened on the adjustment base, and the through hole is in threaded cooperation with the lead screw shaft. A driving motor for driving the lead screw shaft to rotate to drive the adjustment base to slide along the opening direction of the adjustment groove is arranged on the support plate, and the output end of the driving motor is coaxially connected to the lead screw shaft.

[0012] The advantages of adopting the above technical solution are as follows: In the above technology, the adjustment groove opened along the height direction on the shelf plate provides a sliding path for the adjustment base, and the height position of the axial loading cylinder can be adjusted according to the specifications of the bearing to be tested or the test requirements. The threaded engagement structure between the adjustment base and the lead screw shaft realizes precise displacement control of the adjustment base by driving the lead screw shaft to rotate by a driving motor. Compared with manual adjustment, it can significantly improve the accuracy and efficiency of height adjustment. The coaxial connection design between the driving motor and the lead screw shaft ensures the directness and stability of power transmission and reduces energy loss during the transmission process. The coordinated operation of the adjustment groove, the adjustment base, the lead screw shaft and the driving motor in the above technology enables the axial loading structure to adapt to different-sized special-shaped load plates or bearings to be tested, expanding the applicable range of the testing machine. The automated design of this adjustment structure reduces the manual operation intensity and improves the consistency of the axial load application position at the same time, providing a reliable guarantee for result comparison under different test conditions.

[0013] The present invention is further configured as follows: The 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 arranged at a position below the tooling table, and the radial loading shaft is vertically and connectedly arranged relative to the horizontal part.

[0014] The advantages of adopting the above technical solution are as follows: In the above technology, the radial loading shaft of the radial loading structure is vertically connected to the horizontal part, which can ensure the orthogonality of the radial load application direction and the horizontal part and avoid simulation errors caused by load direction deviation; the radial loading cylinder is arranged at a position below the tooling table, optimizing the spatial layout of the testing machine, reducing interference with the test area above the tooling table, facilitating the installation and observation of the bearing to be tested and related components. At the same time, the structural design of the radial loading cylinder driving the radial loading shaft to move up and down can realize the dynamic application of the radial load, meeting the simulation requirements of the radial force changing with the working conditions during the actual operation of the bearing. The connection method between the radial loading shaft and the horizontal part ensures the directness of load transmission. Combining with the precise driving ability of the radial loading cylinder, it effectively improves the accuracy and stability of radial load simulation. The coordinated operation of the radial loading cylinder arranged below and the vertically connected radial loading shaft provides balanced radial support for the horizontal part of the special-shaped load plate, ensuring the structural stability during the load application process.

[0015] The present invention is further configured such that: the radial loading structure further includes a right-angle conversion component, which is composed of a conversion base, a rotating shaft, and a right-angle plate. The right-angle plate is formed by the relative perpendicular connection of a horizontal plate and a vertical plate, and the radial cross-section of the right-angle plate is arranged in an "L" shape. The rotating shaft is arranged at the connection position of the horizontal plate and the vertical plate. The conversion base is arranged below the tooling table. The rotating shaft is rotatably connected in the conversion base. The output end of the radial loading cylinder is vertically connected to the vertical plate in a relative manner. The end of the radial loading shaft is vertically connected to the horizontal plate in a relative manner. 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 solutions are as follows: In the above technology, the conversion base of the right-angle conversion component is arranged 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 through the rotating shaft, which can convert the vertical driving force of the radial loading cylinder into the horizontal load of the radial loading shaft, realizing the efficient conversion of the force direction. The design of the vertical connection between the output end of the radial loading cylinder and the vertical plate of the right-angle plate and the vertical connection between the radial loading shaft and the horizontal plate ensures the clarity of the driving force transmission path and the accuracy of the force value conversion. By arranging the tensile and 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. As the radial loading cylinder, the servo electro-hydraulic actuator has the characteristics of fast response speed and high control accuracy, and can simulate more complex radial load change conditions. Through the cooperation of the right-angle conversion component and the servo electro-hydraulic actuator, the above technology expands the application method of the radial load, enabling the testing machine to be closer to the complex radial force-bearing scenarios in the actual operation of the bearing.

[0017] The present invention is further configured such that: the temperature control simulation system includes a high and low temperature thermostat arranged on one side of the tooling table and a heat preservation box arranged on the tooling table. The special-shaped load plate and the bearing to be tested are both arranged in the heat preservation box. A temperature control pipeline is connected between the high and low temperature thermostat and the heat preservation box. The high and low temperature thermostat adjusts the internal temperature of the heat preservation box through the temperature control pipeline to simulate the environmental temperature conditions during the actual operation of the bearing.

[0018] The advantages of adopting the above technical solution are as follows: In the above technology, the heat preservation box body of the temperature control simulation system encloses the special-shaped load plate and the bearing to be tested inside, reducing the interference of the external environmental temperature on the test area and improving the stability of temperature control. The high and low temperature temperature control machine is connected to the heat preservation box body through a temperature control pipeline, which can achieve precise adjustment of the temperature inside the box, covering a wide temperature range from low temperature to high temperature, and simulating the environmental temperature of the bearing under different climate conditions or operating states. The design of the temperature control pipeline ensures the circulating flow of the temperature adjustment medium, making the temperature distribution in the heat preservation box body more uniform and avoiding the influence of local temperature deviation on the test results. Through the linkage operation of the high and low temperature temperature control machine and the heat preservation box body, the above technology can set the temperature change curve according to the test requirements and simulate the dynamic change process of the temperature of the bearing over time or working conditions during actual operation. The temperature simulation function of this system enhances the consistency between the test conditions and the actual working conditions, providing a reliable basis for the performance evaluation of the bearing in different temperature environments. The high and low temperature temperature control machine in the above technology is a prior art. The high and low temperature temperature control machine in the prior art usually consists of a refrigeration system, a heating system, a control system, a circulation system, a heat preservation structure, a safety protection device and auxiliary components. The refrigeration system includes a compressor, a condenser, an evaporator and an expansion valve, and realizes the cooling function through the refrigerant cycle. The heating system uses an electric heating tube, a PTC element or an electromagnetic heating device, and cooperates with a temperature controller to achieve temperature rise adjustment. Since the high and low temperature temperature control machine is a prior art, its structure and function will not be elaborated too much here.

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

[0020] The advantages of adopting the above technical solution are as follows: The permanent magnet servo motor adopted by the servo drive system in the above technology has the characteristics of high power density, fast response speed and high control precision, and can accurately control the rotation speed and torque output of the main shaft 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 main shaft, which can monitor the output torque value in real time and provide feedback for the control of the servo motor to ensure the stability and accuracy of the torque output. The coordinated work of the permanent magnet servo motor and the torque sensor realizes the precise regulation of the operating parameters of the main shaft, and can simulate the speed or torque fluctuation conditions caused by load changes during the actual operation of the hub maintenance-free bearing of the truck wheel. The high dynamic response characteristic of this drive system can quickly track the rotation speed curve set by the test, improving the efficiency of the simulation test and the reliability of the results. Compared with the traditional drive motor, the energy-saving characteristic of the permanent magnet servo motor can also reduce the operating energy consumption of the test machine.

[0021] The present invention is further provided that: there are two test seats oppositely arranged on the tooling table, through holes for the spindle to pass through are provided on both of the two test seats, the two through holes are coaxially arranged, and test bearings are connected between the outer peripheral wall of the spindle and the inner peripheral walls of the two through holes, and the test bearings are paired tapered roller bearings.

[0022] The advantages of adopting the above technical solution are as follows: in the above technology, the two test seats oppositely arranged on the tooling table support the spindle through coaxial through holes, ensuring the coaxiality during the operation of the spindle, reducing vibration and errors caused by support offset. The test bearings adopt paired tapered roller bearings, which can bear radial loads and axial loads simultaneously, improving the support ability for the spindle, ensuring the smooth operation of the spindle. The symmetrical layout of the two test seats makes the load distribution of the spindle more uniform, reducing the stress intensity of a single test bearing and prolonging its service life. The preloading installation method of the paired tapered roller bearings can reduce the running clearance, improve the rotation accuracy of the spindle, and ensure the consistency of the synchronous operation of the outer ring of the bearing to be tested and the spindle.

[0023] The present invention is further provided that: an oil lubricating tank is arranged below the tooling table, and the oil lubricating tank is in linkage cooperation with the two test seats respectively and is connected with an oil lubricating circulation path to realize the oil lubricating tank providing circulating lubricating oil to the surface of the spindle.

[0024] The advantages of adopting the above technical solution are as follows: in the above technology, the oil lubricating tank arranged below the tooling table is connected with the two test seats through the oil lubricating circulation path, and can continuously provide lubricating oil to the surface of the spindle and the test bearings, reducing the frictional loss during operation and prolonging the service life of the spindle and the test bearings. The circulating flow of the lubricating oil can take away the heat generated by friction, playing a cooling role and avoiding component deformation or lubrication failure caused by too high temperature. The design of the oil lubricating circulation path ensures the cleanliness of the lubricating oil, removes impurities through a filtering device, and reduces the damage of abrasive wear to components. The continuous oil supply capacity of the oil lubricating tank can meet the needs of long-term tests, avoiding test interruption caused by manual oil replenishment and improving the test efficiency. The setting of the above lubrication system optimizes the operating environment of the spindle and the test bearings, ensures the reliability and stability of the testing machine under high-load and long-term working conditions, and indirectly improves the accuracy of the simulation test results of the bearing to be tested. In the above technology, the oil lubricating tank is a prior art, which includes a pump body for circulating and conveying lubricating oil. Since it is a prior art, its structure and function will not be described in detail herein. Description of the Drawings

[0025] Figure 1 is the three-dimensional view of the present invention; Figure 2 is the three-dimensional view of the tooling table and its linkage components in the present invention; Figure 3 is the three-dimensional view of the special-shaped load plate and its linkage structure in the present invention; Figure 4 is Figure 3 a sectional view of; Figure 5 is a three-dimensional view of the test seat and its linkage structure in the present invention; Figure 6 is Figure 5 a sectional view of; Figure 7 is a three-dimensional view of the radial loading cylinder and its linkage structure in the present invention; Figure 8 is Figure 7 a sectional view of. Specific embodiments

[0026] The present invention provides a full-condition simulation test machine for a maintenance-free bearing of a truck hub, which includes a tooling table 1, a servo drive system, a servo hydraulic system, and a temperature control simulation system. A tooling seat 11 is arranged on the tooling table 1, and a main shaft 12 is movably arranged on the tooling seat 11. A bearing to be tested 121 is detachably connected between the main shaft 12 and the tooling seat 11. The servo drive system is linked with the main shaft 12 to make the main shaft 12 operate and drive the outer ring of the bearing to be tested 121 to rotate synchronously to simulate the actual operating conditions of the bearing. An irregular load plate 2 and a mandrel 24 are arranged on the tooling table 1. The irregular load plate 2 is linked with the mandrel 24, and the mandrel 24 is inserted and detachably connected to the inner ring shaft hole of the bearing to be tested 121. The servo drive system is linked with the irregular load plate 2 and applies axial or radial or combined loads to the bearing to be tested 121 through the irregular load plate 2 and the mandrel 24 to simulate the load conditions suffered by the bearing during actual operation. The temperature control simulation system is linked with the bearing to be tested 121 and regulates the ambient temperature of the bearing to be tested 121 to simulate the actual temperature conditions of the bearing. A transition disk 21 is rotatably arranged on the irregular load plate 2. A connection hole 211 is opened on the starting end face of the transition disk 21, and the inner peripheral wall of the connection hole 211 is detachably connected to the outer ring of the bearing to be tested 121. A centering shaft 122 is coaxially connected to the starting end of the main shaft 12, and the ending end of the transition disk 21 is coaxially connected to the centering shaft 122. The irregular load plate 2 is formed by relatively vertically connecting a horizontal part 22 and a vertical part 23, and the combined radial cross-section of the horizontal part 22 and the vertical part 23 is in a "T" shape. The servo hydraulic system includes an axial loading structure and two groups of radial loading structures. The axial loading structure is linked with the vertical part 23 to apply an axial load to the irregular load plate 2 through the axial loading structure. The two radial loading structures are respectively arranged at both ends of the horizontal part 22 and are both linked with the horizontal part 22 to apply radial loads to the irregular load plate 2 through the radial loading structures. A support plate 13 is arranged on the tooling table 1. The axial loading structure includes an axial loading cylinder 3 movably arranged on the support plate 13 and an axial loading shaft 31 used for coaxially connecting to the output end of the axial loading cylinder 3. The ending end of the axial loading shaft 31 is hinged with an axial base 311, and the axial base 311 is detachably connected to the back surface of the vertical part 23. The support plate 13 is arranged perpendicular to the tooling table 1, and an adjustment groove 131 is opened on the support plate 13 along its height direction. The ending end of the axial loading cylinder 3 is hinged with an adjustment base 32, and the adjustment base 32 is slidably arranged in the adjustment groove 131. A lead screw shaft 33 is rotatably arranged in the adjustment groove 131. A through hole 321 for the lead screw shaft 33 to pass through is opened on the adjustment base 32, and the through hole 321 is in threaded cooperation with the lead screw shaft 33. A drive motor 34 for driving the lead screw shaft 33 to rotate to drive the adjustment base 32 to slide along the opening direction of the adjustment groove 131 is arranged on the support plate 13, and 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 lifting of the radial loading shaft 41. The radial loading cylinder 4 is arranged below the tooling table 1. The radial loading shaft 41 is vertically connected relative to the horizontal part 22. The radial loading structure further includes a right-angle conversion component, which is composed of a conversion base 42, a rotating shaft 43 and a right-angle plate 44. The right-angle plate 44 is composed of a horizontal plate 441 and a vertical plate 442 which are vertically connected relative to each other, and the radial cross-section of the right-angle plate 44 is arranged in an "L" shape. The rotating shaft 43 is arranged at the connection position of the horizontal plate 441 and the vertical plate 442. The conversion base 42 is arranged below the tooling table 1. The rotating shaft 43 is rotatably connected in the conversion base 42. The output end of the radial loading cylinder 4 is vertically connected relative to the vertical plate 442. The end of the radial loading shaft 41 is vertically connected relative to the horizontal plate 441. A tensile and 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. The temperature control simulation system includes a high and low temperature thermostat 51 arranged on one side of the tooling table 1 and a heat preservation box 5 arranged on the tooling table 1. The special-shaped load plate 2 and the bearing to be tested 121 are both arranged in the heat preservation box 5. A temperature control pipeline 52 is connected between the high and low temperature thermostat and the heat preservation box 5. The high and low temperature thermostat 51 adjusts the internal temperature of the heat preservation box 5 through the temperature control pipeline 52 to simulate the environmental temperature condition during the actual operation of the bearing. 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 main shaft 12, and a torque sensor 61 is connected between the output end of the servo motor 6 and the main shaft 12. Two test seats 7 are oppositely arranged on the tooling table 1. Through holes 71 for the main shaft 12 to pass through are arranged through both of the two test seats 7. The two through holes 71 are coaxially arranged. Pilot bearings 72 are connected between the outer peripheral wall of the main shaft 12 and the inner peripheral walls of the two through holes 71. The pilot bearings 72 are paired tapered roller bearings. A lubricating oil tank is arranged below the tooling table 1. The lubricating oil tank is linked and cooperated with the two test seats 7 respectively and is connected with a lubricating oil circulation path to supply circulating lubricating oil to the surface of the main shaft 12 from the lubricating oil tank.,

[0027] Operating process of this device: 1. Test preparation stage: Clamping of the bearing to be tested: Insert and fix the inner ring shaft hole of the bearing to be tested with the mandrel, and the outer ring is detachably connected to the transition plate through the connection hole of the transition plate; the end of the transition plate is coaxially connected with the centering shaft at the beginning of the main shaft to ensure the coaxiality of the outer ring and the main shaft; complete the detachable connection between the bearing and the tooling seat to complete the clamping.

[0028] System initialization: Start the servo drive system, servo hydraulic system, temperature control simulation system and lubricating oil circulation system; adjust the rotation of the screw shaft by driving the motor to drive the adjustment base to slide along the frame plate adjustment groove, adjust the height position of the axial loading cylinder, and connect the axial base at the end of the axial loading shaft to the back of the vertical part of the special-shaped load plate; check the connection status of the right-angle conversion components (conversion base, rotating shaft, right-angle plate) of the radial loading structure, ensure that the output end of the radial loading cylinder (servo electro-hydraulic actuator) is vertically connected to the vertical plate of the right-angle plate, and the radial loading shaft is connected to the horizontal plate through the tension and pressure load sensors.

[0029] 2. Working condition simulation operation stage: Rotational working condition simulation: The permanent magnet servo motor of the servo drive system starts up and transmits power to the main shaft through the torque sensor. The main shaft drives the centering shaft, transition plate and outer ring of the bearing to be tested to rotate synchronously. The paired tapered roller bearings on the two test seats support the main shaft. The lubricating oil tank provides circulating lubricating oil to the main shaft surface and test bearing through the lubricating oil circulation passage, reducing friction loss and removing heat to ensure smooth operation of the main shaft.

[0030] Load case simulation: 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, applying axial force to the vertical part of the special-shaped load plate. The force is transmitted to the inner ring of the bearing to be tested through the core shaft, simulating the axial force in the actual operation of the bearing; Radial load application: The radial loading cylinder (servo electro-hydraulic actuator) is started, 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 horizontal load is transmitted to the radial loading shaft through the cross plate and the tension and pressure load sensors. The radial loading shaft is perpendicularly connected to the horizontal part of the special-shaped load plate, and radial force is applied to both ends of the horizontal part. The force is transmitted to the inner ring of the bearing to be tested through the core shaft, simulating radial or combined load conditions. The axial and radial loading structures can work independently or in conjunction to cover the needs of multi-directional load simulation.

[0031] Temperature condition simulation: The high and low temperature control units of the temperature control simulation system are started, and hot / cold media are transported to the insulation box through the temperature control pipeline to adjust the temperature inside the box (over a wide range from low to high). The insulation box encloses the special-shaped load plate and the bearing to be tested to reduce external temperature interference. The circulation system (fan, air duct) ensures uniform temperature distribution inside the box, dynamically simulating the ambient temperature changes during actual bearing operation.

[0032] In the above technology, the heat preservation box body can be provided with a swing cabinet door so that the operator can retain the box chamber of the heat preservation box body by opening the cabinet door to facilitate the disassembly and assembly of the bearing.

[0033] In the above technology, a hydraulic pump station can be set on one side of the tooling table to provide power support for the axial loading cylinder and the radial loading cylinder. Since the hydraulic pump station is a prior art, its structure and linkage relationship will not be elaborated too much. The identification of the hydraulic pump station in the attached drawings of the specification is 8.

[0034] The above has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A full-condition simulation test machine for a maintenance-free bearing of a truck hub, characterized in that: It includes a tooling table, a servo drive system, a servo hydraulic system, and a temperature control simulation system. A tooling seat and a spindle movably arranged on the tooling seat are provided on the tooling table. A bearing to be tested is detachably connected between the spindle and the tooling seat. The servo drive system is linked and cooperated with the spindle to make the spindle operate and drive the outer ring of the bearing to be tested to rotate synchronously to simulate the actual operating conditions of the bearing. An irregular load plate and a mandrel are provided on the tooling table. The irregular load plate is linked and cooperated with the mandrel, and the mandrel is inserted and detachably connected to the inner ring shaft hole of the bearing to be tested. The servo drive system is linked and cooperated with the irregular load plate and applies axial or radial or combined loads to the bearing to be tested through the irregular load plate and the mandrel to simulate the load conditions suffered by the bearing during actual operation. The temperature control simulation system is linked and cooperated with the bearing to be tested and regulates the ambient temperature of the bearing to be tested to simulate the actual temperature conditions of the bearing.

2. The full-condition simulation test machine for a maintenance-free bearing of a truck hub according to claim 1, wherein: A transition disk is rotatably arranged on the irregular load plate. A connection hole is provided on the starting end face of the transition disk. The inner peripheral wall of the connection hole is detachably connected to the outer ring of the bearing to be tested. A centering shaft is coaxially connected to the starting end of the spindle. The ending end of the transition disk is coaxially connected to the centering shaft. The irregular load plate is composed of a horizontal part and a vertical part which are relatively vertically connected, and the combined radial cross-section of the horizontal part and the vertical part is in a "T" shape. The servo hydraulic system includes an axial loading structure and two groups of radial loading structures. The axial loading structure is linked and cooperated with the vertical part to apply an axial load to the irregular load plate through the axial loading structure. The two radial loading structures are respectively arranged at both ends of the horizontal part and are both linked and cooperated with the horizontal part to apply a radial load to the irregular load plate through the radial loading structure.

3. A full-condition simulation test machine for a maintenance-free bearing of a truck hub according to claim 2, characterized in that: A support plate is provided on the tooling table. The axial loading structure includes an axial loading cylinder movably arranged on the support plate and an axial loading shaft used for coaxially connecting to the output end of the axial loading cylinder. The ending end of the axial loading shaft is hinged with an axial base, and the axial base is detachably connected to the back surface of the vertical part.

4. A full-condition simulation test machine for a maintenance-free bearing of a truck hub according to claim 3, characterized in that: The support plate is arranged perpendicular to the tooling table, and an adjustment groove is opened on the support plate along its height direction. The ending end of the axial loading cylinder is hinged with an adjustment base, and the adjustment base is slidably arranged in the adjustment groove. A lead screw shaft is rotatably arranged in the adjustment groove. A through hole for the lead screw shaft to pass through is provided on the adjustment base, and the through hole is in threaded cooperation with the lead screw shaft. A drive motor for driving the lead screw shaft to rotate to drive the adjustment base to slide along the opening direction of the adjustment groove is provided on the support plate, and the output end of the drive motor is coaxially connected to the lead screw shaft.

5. The full-condition simulation test machine for the maintenance-free bearing of a truck hub according to claim 2, characterized in that: The radial loading structure includes a radial loading shaft and a radial loading cylinder for driving the radial loading shaft to lift. The radial loading cylinder is arranged at the lower position of the tooling table, and the radial loading shaft is arranged perpendicular to and connected with the horizontal part.

6. The full-condition simulation test machine for the maintenance-free bearing of a truck hub according to claim 5, wherein: The radial loading structure also includes a right-angle conversion component, which is composed 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 relative to each other vertically, and the radial cross-section of the right-angle plate is "L"-shaped. The rotating shaft is set at the connection position of the horizontal plate and the vertical plate. The conversion base is set below the workbench. The rotating shaft is rotatably connected to the conversion base. The output end of the radial loading cylinder is connected relative to the vertical plate vertically. The end of the radial loading shaft is connected relative to the horizontal plate vertically. A tension and pressure 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.

7. A full-condition simulation test machine for a maintenance-free bearing of a truck hub according to claim 1, characterized in that: The temperature control simulation system includes a high and low temperature temperature controller arranged on one side of the workbench and an insulation box arranged on the workbench. The special-shaped load plate and the bearing to be tested are both arranged in the insulation box. A temperature control pipeline is connected between the high and low temperature temperature controller and the insulation box. The high and low temperature temperature controller adjusts the internal temperature of the insulation box through the temperature control pipeline to simulate the ambient temperature conditions during the actual operation of the bearing.

8. A full-condition simulation test machine for a maintenance-free bearing of a truck hub 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 main shaft, and a torque sensor is connected between the output end of the servo motor and the main shaft.

9. The full-condition simulation test machine for a maintenance-free bearing of a truck hub according to claim 1, wherein: Two test seats are arranged opposite to each other on the workbench. Both of the test seats are penetrated by 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.

10. A full-condition simulation test machine for a maintenance-free bearing of a truck hub according to claim 9, characterized in that: A lubricating oil tank is provided below the workbench. The lubricating oil tank is respectively coordinated with the two test seats and connected to a lubricating oil circulation passage so that the lubricating oil tank can provide circulating lubricating oil to the main shaft surface.

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