A fatigue testing device for suspension

Abstract

This invention provides a fatigue testing device for suspensions, comprising: a frame, a road surface simulation mechanism, a road condition simulation mechanism, and a drive mechanism; the frame is used to mount the suspension to be tested; the road surface simulation mechanism abuts against the tires on the suspension to be tested, and one end of the road surface simulation mechanism is hinged to the frame; the road condition simulation mechanism includes: a base and a telescopic component; the base is slidably mounted on the frame along the length of the road surface simulation mechanism, one end of the telescopic component is slidably mounted on the base in the vertical direction, and the other end of the telescopic component is hinged to the other end of the road surface simulation mechanism; the drive mechanism drives the telescopic component to extend and retract at different heights to simulate the bumpy road conditions of the suspension to be tested on roads with different inclination angles. This fatigue testing device can comprehensively cover the three-dimensional stress scenarios of the suspension under test during actual driving, improving the realism and comprehensiveness of the fatigue test, and providing precise test support for the reliability detection and design optimization of the suspension under test.

Description

Technical Field

[0001] This invention relates to the field of automotive suspension testing technology, and more specifically to a fatigue testing device suitable for suspensions. Background Technology

[0002] The suspension is a general term for all force-transmitting connection devices between the car frame (or monocoque body) and the axle (or wheels). Its function is to transmit the force and torque acting between the wheels and the frame, and to buffer the impact force transmitted from uneven road surfaces to the frame or body, and reduce the vibration caused thereby, so as to ensure that the car can drive smoothly.

[0003] As a crucial component of automobiles, the suspension system requires reliability testing during the initial design phase. Furthermore, quality checks are conducted on the suspension during vehicle production to assess its reliability, and fatigue testing of the suspension system is an essential step.

[0004] Currently, fatigue testing devices are commonly used. For example, patent CN118533519A discloses a fatigue testing device suitable for suspensions, including a base plate with two columns fixedly connected to its upper end. The upper ends of the two columns are fixedly connected to a common top frame. A rotating groove is located between the two columns at the upper end of the base plate. A turntable is located inside the rotating groove, and four placement slots are provided at the upper end of the turntable, evenly spaced along the circumference of the upper end of the turntable. Each placement slot contains a road surface component. A suspension mounting assembly is connected to the lower end of the top frame. This invention enables fatigue testing of the suspension body under different road surfaces, making suspension fatigue testing more convenient.

[0005] However, this fatigue testing device only relies on four sets of road conveyor belts to simulate a limited number of road surface patterns, and can only achieve friction and simple uneven contact within a planar range. It cannot truly reproduce the complex three-dimensional road conditions encountered by vehicles in actual driving, such as slopes, large vertical impacts, continuous potholes, and random bumps, and it is difficult to fully cover the real stress scenarios of the suspension.

[0006] For example, patent CN223295676U discloses a fatigue testing device for an automotive suspension system, which includes: an automotive suspension, a simulated frame, a suspension drive loading unit, a suspension load simulation unit, a detection unit, an image acquisition device, a main control console of the testing platform, and a ground rail. The automotive suspension is a rear suspension, and the simulated frame is the part of the structure connecting the rear suspension system to the frame. The suspension drive loading unit drives the wheel hub adapter in the automotive suspension to rotate. The suspension load simulation unit simulates different road conditions by applying loads to the wheel hub adapter, and the resistance and vibration of the road conditions are transmitted to the suspension through the wheel hub adapter. The detection unit detects the deformation and fatigue of the automotive suspension. The detection unit and the image acquisition device collect fatigue test data of each component of the suspension system and test the fatigue strength of each component. The main control console of the testing platform can view or output the collected and recorded information through a display.

[0007] However, this device only simulates bumpy road conditions by vertically raising and lowering the second loading motor driven by a linear motor, and can only simulate vibration in a single vertical direction. In actual vehicle operation, the wheel hub will be subjected to forces and vibrations in multiple directions, such as turning, changing lanes, and lateral impacts from potholes.

[0008] In summary, existing suspension fatigue testing devices generally suffer from common defects such as a single dimension of road condition simulation and incomplete coverage of stress conditions. They are unable to realistically reproduce the complex three-dimensional road conditions and multi-directional stress environment during vehicle operation, resulting in significant deviations between test results and actual operating conditions. Consequently, they cannot comprehensively and accurately assess the fatigue reliability of the suspension system. Summary of the Invention

[0009] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a fatigue testing device suitable for suspensions, comprising: A rack is used to mount the suspension to be tested; A road surface simulation mechanism abuts against a tire on the suspension to be tested, with one end of the road surface simulation mechanism hinged to the frame; A road condition simulation mechanism includes: a base and a telescopic assembly; the base is slidably mounted on a frame along the length of the road condition simulation mechanism, one end of the telescopic assembly is slidably mounted on the base in the vertical direction, and the other end of the telescopic assembly is hinged to the other end of the road condition simulation mechanism; and The drive mechanism drives the telescopic component to extend and retract at different heights to simulate the bumpy road conditions of the suspension under test on roads with different inclination angles.

[0010] Preferably, the driving mechanism includes: a tapered abutment and a driving assembly; the axis of the tapered abutment is parallel to the axis of the hinge of the telescopic assembly, and the tapered abutment is slidably mounted on the base along the axial direction; the end of the telescopic assembly away from the road surface simulation mechanism slides against the tapered abutment; the driving assembly drives the tapered abutment to slide, so as to change the tilt angle of the road surface simulation mechanism by changing the overall height of the telescopic assembly; and the driving assembly synchronously drives the telescopic assembly to extend and retract, so as to simulate the bumpy road conditions on the suspension road surface to be tested.

[0011] Preferably, the conical abutment is conical in shape and is mounted on a base via a splined shaft; the splined shaft is rotatably mounted on the base, and the conical abutment is splinedly connected to the splined shaft; the telescopic assembly includes: a connecting seat, a sleeve, a column, a transmission unit, and a roller; the connecting seat is slidably mounted on the base in the vertical direction; one end of the connecting seat is hinged to the end of the road surface simulation mechanism; the other end of the connecting seat is fitted with a sleeve, one end of the column is slidably inserted into the sleeve, and the other end of the column is rotatably fitted with a roller; the roller abuts against the conical abutment; the driving assembly moves the conical abutment to slide back and forth on the splined shaft, and the driving assembly drives the roller to rotate by driving the conical abutment to rotate; the transmission unit drives the column to slide back and forth within the sleeve by the rotation of the roller.

[0012] Preferably, the transmission unit includes: a disc and a connecting rod; the disc is coaxially fixed with the roller, one end of the connecting rod is eccentrically hinged to one side of the disc, and the other end of the connecting rod is hinged to the sleeve.

[0013] Preferably, the drive assembly includes: a reciprocating screw, a nut seat, a deflector plate, a connecting unit, and a motor; the reciprocating screw is rotatably mounted on the base, and the reciprocating screw is coaxially arranged with the spline shaft; the connecting unit connects the reciprocating screw and the spline shaft to rotate synchronously; the motor drives the reciprocating screw to rotate; the nut seat is threadedly connected to the reciprocating screw; both ends of the tapered abutment are respectively provided with deflector plates, both deflector plates are coaxially and rotatably connected to the tapered abutment, and both deflector plates are fixed on the nut seat.

[0014] Preferably, the connecting unit includes: a first pulley, a second pulley, and a transmission belt; the first pulley rotates synchronously with the reciprocating lead screw, the second pulley rotates synchronously with the spline shaft, and the transmission belt connects the first pulley and the second pulley.

[0015] Preferably, the connecting unit further includes: a plug shaft, which is plugged into the base through a round hole; the plug shaft is coaxially arranged with the reciprocating screw, and the end of the plug shaft near the reciprocating screw is tapered and has a toothed structure; the end of the reciprocating screw near the plug shaft has a tapered limiting groove that mates with the end of the plug shaft near the reciprocating screw; the first pulley is rotatably mounted on the base, and the first pulley is splinedly connected to the plug shaft.

[0016] Preferably, the frame includes: a base, a frame body, a fixed seat, and a cylinder; the road surface simulation mechanism, the road condition simulation mechanism, and the drive mechanism are all mounted on the base; the frame body is mounted above the base; the fixed seat is mounted on the frame body via the cylinder; the fixed seat is detachably connected to the suspension to be tested.

[0017] Preferably, the road surface simulation mechanism includes: a simulation frame; a first rotating roller, a second rotating roller, a flat belt, a load-bearing roller, a tensioning roller, and a driving component; one end of the simulation frame is hinged to the machine frame; the first rotating roller, the second rotating roller, the load-bearing roller, and the tensioning roller are rotatably mounted on the simulation frame, and the axis of the first rotating roller is coaxial with the hinge of the simulation frame, and the axis of the second rotating roller is coaxial with the hinge of the telescopic assembly; the flat belt is sleeved on the first rotating roller and the second rotating roller, and the tensioning roller tensions the flat belt; a plurality of load-bearing rollers are disposed within the flat belt, and the plurality of load-bearing rollers abut against the side of the flat belt near the suspension to be tested; the driving component drives the first rotating roller to rotate.

[0018] Preferably, there are two parallel arrangements of the road surface simulation mechanism, the road condition simulation mechanism, and the drive mechanism.

[0019] Compared with the prior art, the present invention has at least the following advantages: 1. In this invention, the drive mechanism drives the telescopic component to extend and retract at different heights. The telescopic component drives the road surface simulation mechanism to rotate around its hinge point with the frame. This changes the tilt angle of the road surface simulation mechanism, simulating the multi-directional stress state of the suspension under test on inclined roads such as slopes. The road surface simulation mechanism generates continuous undulations and vertical impacts, reproducing complex three-dimensional road conditions such as large drops, continuous potholes, and random bumps in actual vehicle driving. The suspension under test bears the corresponding forces and torques under the contact action between the tires and the road surface simulation mechanism, completing fatigue loading tests under multiple scenarios. This method breaks through the limitation of traditional devices that can only simulate planar road conditions, comprehensively covering the three-dimensional stress scenarios of the suspension under test in actual driving, improving the authenticity and comprehensiveness of fatigue testing, providing accurate test support for the reliability detection and design optimization of the suspension under test, and effectively solving the technical problems of existing devices being unable to reproduce complex three-dimensional road conditions and insufficient test scenario coverage.

[0020] 2. In this invention, the driving assembly drives the conical abutment to slide along its axial direction on the base. Because the axis of the conical abutment is parallel to the axis of the hinge point of the telescopic assembly, and the end of the telescopic assembly away from the road surface simulation mechanism slides against the conical surface of the conical abutment, as the conical abutment slides, its conical surface generates a vertical supporting force and guiding force on the end of the telescopic assembly, pushing the end of the telescopic assembly away from the road surface simulation mechanism to rise and fall vertically, thereby changing the overall height of the telescopic assembly and causing the road surface simulation mechanism to rotate around its axis relative to the frame. The hinge point rotates, allowing for flexible adjustment of the tilt angle of the road surface simulation mechanism. This enables precise simulation of the multi-directional stress state of the suspension under test under different slope conditions, such as flat, uphill, and downhill slopes. Simultaneously, the drive component synchronously drives the telescopic component to extend and retract. In conjunction with the tapered abutment, the height of the telescopic component is adjusted, causing it to reciprocate vertically. This drives the road surface simulation mechanism to continuously undulate, fully replicating the bumpy ride of a vehicle on different slopes. This provides a test environment that closely resembles real-world conditions for fatigue performance testing of the suspension under test.

[0021] 3. In this invention, the drive assembly, on the one hand, moves the conical abutment to slide back and forth along the axial direction on the spline shaft. The conical abutment relies on the spline shaft to achieve circumferential fixation and axial sliding. Its conical surface changes the contact height with the roller as it slides axially, pushing the roller, column and connecting seat to rise and fall in the vertical direction, thereby driving the road simulation mechanism to rotate around the frame hinge point, realizing the adjustment of different inclination angles for flat slopes, uphill slopes and downhill slopes. On the other hand, the drive assembly drives the spline shaft to rotate. The spline shaft drives the conical abutment to rotate synchronously through the spline connection. The rotating conical abutment drives the roller it abuts to to rotate through friction. The roller drives the column to slide back and forth in the sleeve through the transmission unit, causing the connecting seat to produce vertical extension and retraction movement, thereby driving the road simulation mechanism to realize the simulation of bumpy and undulating road conditions.

[0022] 4. In this invention, a motor drives a reciprocating screw to rotate, which in turn drives a splined shaft to rotate synchronously via a connecting unit. This causes the conical abutment to rotate synchronously with the splined shaft, providing rotational power for the telescopic movement of the telescopic assembly. Simultaneously, the reciprocating screw drives a nut seat to reciprocate along its axial direction. The nut seat drives the actuating plates at both ends to move axially synchronously. The actuating plates push the conical abutment to slide axially on the splined shaft, thereby adjusting the contact height between the conical abutment and the roller, and completing the adjustment of the tilt angle of the road simulation mechanism. This drive assembly, through the cooperation of a single motor and a reciprocating screw, synchronously realizes the circumferential rotation and axial movement of the conical abutment. It features concentrated power, strong linkage, and effectively ensures the synchronization of tilt angle adjustment and bump simulation. The reciprocating screw can realize the automatic reciprocating motion of the nut seat without the need for an additional reversing mechanism. The structure is simple and compact, and the transmission is stable and reliable, significantly improving the integration of the device and the accuracy of the test condition simulation.

[0023] 5. In this invention, the connecting unit can independently control the start and stop of the bump simulation action through the clutch structure of the plug-in shaft, realizing the step-by-step or linkage control of tilt angle adjustment and bump simulation, and adapting to different test conditions.

[0024] 6. In this invention, the road surface simulation mechanism, the road condition simulation mechanism, and the drive mechanism are arranged in two sets in parallel according to the number of wheels on the suspension to be tested. The two sets of mechanisms are independently controllable and can meet various test modes such as single-sided loading and double-sided synchronous loading, further expanding the range of test conditions. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of the present invention, the accompanying drawings used in the specific embodiments will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to scale.

[0026] Figure 1 This is a perspective view of a fatigue testing device for suspension provided in an embodiment of the present invention.

[0027] Figure 2 This is a structural diagram of the road surface simulation mechanism and the road condition simulation mechanism provided in the embodiments of the present invention.

[0028] Figure 3 This is a structural diagram of the road condition simulation mechanism and the drive mechanism provided in the embodiments of the present invention.

[0029] Figure 4 This is a perspective view of the driving mechanism provided in an embodiment of the present invention.

[0030] Figure label: 1. Frame; 11. Base; 12. Frame body; 13. Mounting base; 14. Cylinder; 2. Road surface simulation mechanism; 21. Simulation frame; 22. First rotating roller; 23. Second rotating roller; 24. Flat belt; 25. Bearing roller; 26. Tensioning roller; 3. Road condition simulation mechanism; 31. Base; 32. Connecting seat; 33. Sleeve; 34. Column; 35. Roller; 36. Disc; 37. Connecting rod; 4. Drive mechanism; 41. Conical abutment; 42. Splined shaft; 43. Reciprocating lead screw; 44. Nut seat; 45. Actuating plate; 46. First pulley; 47. Second pulley; 48. Transmission belt; 49. Insertion shaft; 5. Suspension to be tested. Detailed Implementation

[0031] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0032] In this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0033] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0034] See Figures 1-4 The present invention provides an embodiment of a fatigue testing device for suspensions, comprising: a frame 1, a road surface simulation mechanism 2, a road condition simulation mechanism 3, and a drive mechanism 4; the frame 1 is used to mount the suspension 5 to be tested; the road surface simulation mechanism 2 abuts against the tires on the suspension 5 to be tested, and one end of the road surface simulation mechanism 2 is hinged to the frame 1; the road condition simulation mechanism 3 includes: a base 31 and a telescopic component; the base 31 is slidably mounted on the frame 1 along the length direction of the road surface simulation mechanism 2, one end of the telescopic component is slidably mounted on the base 31 in the vertical direction, and the other end of the telescopic component is hinged to the other end of the road surface simulation mechanism 2; the drive mechanism 4 drives the telescopic component to extend and retract at different heights to simulate the bumpy road conditions of the suspension 5 to be tested on roads with different inclination angles.

[0035] In practice, the suspension 5 to be tested is mounted on the frame 1, with the tires of the suspension 5 in contact with the road surface simulation mechanism 2. The drive mechanism 4 drives the telescopic component to extend and retract at different heights. The telescopic component causes the road surface simulation mechanism 2 to rotate around its hinge point with the frame 1. At the same time, the telescopic component slides vertically on the base 31 to guide and limit its movement, ensuring it can only move vertically. Simultaneously, the base 31 adaptively slides along the length of the road surface simulation mechanism 2 on the frame 1 to compensate for the relative displacement between the telescopic component and the road surface simulation mechanism 2, preventing motion interference between them. This allows the tilt angle of the road surface simulation mechanism 2 to be changed. The test simulates the multi-directional stress state of the suspension 5 under test on inclined roads such as slopes; the road surface simulation mechanism 2 generates continuous undulations and vertical impacts, reproducing complex three-dimensional road conditions such as large drops, continuous potholes, and random bumps in actual vehicle driving. The suspension 5 under test bears the corresponding forces and torques under the contact action between the tires and the road surface simulation mechanism 2, completing fatigue loading tests under multiple scenarios. This method breaks through the limitation of traditional devices that can only simulate planar road conditions, and fully covers the three-dimensional stress scenarios of the suspension 5 under test in actual driving, improving the authenticity and comprehensiveness of fatigue testing. It provides accurate test support for the reliability detection and design optimization of the suspension 5 under test, and effectively solves the technical problems of existing devices being unable to reproduce complex three-dimensional road conditions and insufficient test scenario coverage.

[0036] Furthermore, there are two parallel road surface simulation mechanisms 2, road condition simulation mechanisms 3, and drive mechanisms 4. The number of sets of road surface simulation mechanisms 2, road condition simulation mechanisms 3, and drive mechanisms 4 is determined by the number of wheels on the suspension 5 under test. The two sets of mechanisms are independently controllable and can meet various test modes such as single-sided loading and dual-sided synchronous loading, further expanding the range of test conditions.

[0037] See Figures 1-4 In other embodiments, the drive mechanism 4 includes a tapered abutment 41 and a drive assembly; the axis of the tapered abutment 41 is parallel to the axis of the hinge of the telescopic assembly, and the tapered abutment 41 is slidably mounted on the base 31 along the axial direction; the end of the telescopic assembly away from the road surface simulation mechanism 2 slides against the tapered abutment 41; the drive assembly drives the tapered abutment 41 to slide, so as to change the tilt angle of the road surface simulation mechanism 2 by changing the overall height of the telescopic assembly; and the drive assembly synchronously drives the telescopic assembly to extend and retract, so as to simulate the bumpy road conditions on the road surface of the suspension 5 under test.

[0038] In practice, the drive assembly drives the conical abutment member 41 to slide along its axial direction on the base 31. Because the axis of the conical abutment member 41 is parallel to the axis of the hinge point of the telescopic assembly, and the end of the telescopic assembly away from the road surface simulation mechanism 2 slides against the conical surface of the conical abutment member 41, as the conical abutment member 41 slides, its conical surface generates a vertical supporting force and guiding force on the end of the telescopic assembly, pushing the end of the telescopic assembly away from the road surface simulation mechanism 2 to rise and fall vertically, thereby changing the overall height of the telescopic assembly and causing the road surface simulation mechanism 2 to rotate around its hinge point. The hinge point of frame 1 rotates, enabling flexible adjustment of the tilt angle of the road surface simulation mechanism 2. This allows for precise simulation of the multi-directional force state of the suspension 5 under different slope conditions, such as flat slopes, uphill slopes, and downhill slopes. Simultaneously, the drive component synchronously drives the telescopic component to perform telescopic movements. In conjunction with the height adjustment of the telescopic component by the conical abutment part 41, the telescopic component reciprocates vertically, causing the road surface simulation mechanism 2 to undulate continuously. This fully replicates the bumpy scene when the vehicle is driving on different slopes, providing a test environment that closely matches real working conditions for the fatigue performance testing of the suspension 5 under test.

[0039] See Figures 1-4 In other embodiments, the conical abutment member 41 is conical in shape and is mounted on the base 31 via a splined shaft 42; the splined shaft 42 is rotatably mounted on the base 31, and the conical abutment member 41 is splinedly connected to the splined shaft 42; the telescopic assembly includes: a connecting seat 32, a sleeve 33, a column 34, a transmission unit, and a roller 35; the connecting seat 32 is slidably mounted on the base 31 in the vertical direction; one end of the connecting seat 32 is hinged to the end of the road surface simulation mechanism 2. Connect; a sleeve 33 is installed at the other end of the connecting seat 32, one end of the column 34 is slidably inserted into the sleeve 33, and a roller 35 is rotatably installed at the other end of the column 34; the roller 35 abuts against the conical abutment 41; the drive assembly moves the conical abutment 41 to slide back and forth on the spline shaft 42, and the drive assembly drives the roller 35 to rotate by driving the conical abutment 41 to rotate; the transmission unit drives the column 34 to slide back and forth in the sleeve 33 by rotating the roller 35.

[0040] In practical implementation, the drive assembly, on the one hand, moves the conical abutment 41 to slide back and forth along the axial direction on the spline shaft 42. The conical abutment 41 is circumferentially fixed and axially slidable by the spline shaft 42. Its conical surface changes the contact height with the roller 35 as it slides axially, pushing the roller 35, column 34 and connecting seat 32 to rise and fall vertically, thereby driving the road simulation mechanism 2 to rotate around the hinge point of the frame 1, realizing the adjustment of different inclination angles for flat slopes, uphill slopes and downhill slopes. On the other hand, the drive assembly drives the spline shaft 42 to rotate. The spline shaft 42 drives the conical abutment 41 to rotate synchronously through the spline connection. The rotating conical abutment... 41 drives the roller 35 that abuts against it to rotate through friction. The roller 35 drives the column 34 to slide back and forth in the sleeve 33 through the transmission unit, so that the connecting seat 32 produces vertical extension and retraction movement, thereby driving the road simulation mechanism 2 to realize the simulation of bumpy and undulating road conditions. In this process, the connecting seat 32 slides vertically along the base 31 for guidance, and the base 31 slides adaptively along the length direction of the road simulation mechanism 2 to compensate for relative displacement and avoid motion interference. This structure realizes the axial sliding and circumferential rotation of the conical abutment 41 simultaneously through a single drive component, respectively completing the tilt angle adjustment and extension and bumpy action of the road simulation mechanism 2.

[0041] See Figures 1-4 In other embodiments, the transmission unit includes a disk 36 and a connecting rod 37; the disk 36 is coaxially fixed with the roller 35, one end of the connecting rod 37 is eccentrically hinged to one side of the disk 36, and the other end of the connecting rod 37 is hinged to the sleeve 33.

[0042] In practical implementation, the disc 36 and roller 35 in the transmission unit are fixed coaxially. The rotation of the roller 35 drives the disc 36 to rotate synchronously. The disc 36 converts the rotary motion into linear reciprocating motion through the eccentrically hinged connecting rod 37, thereby driving the sleeve 33 to slide relative to the column 34, completing the telescopic movement of the telescopic component. The transmission unit adopts an eccentric transmission structure of disc 36 and connecting rod 37, which is direct and reliable, and the motion conversion is precise. It can stably output high-frequency reciprocating telescopic motion, meeting the continuous loading requirements of the fatigue test of the suspension 5 to be tested. At the same time, the structure is compact, occupies little space, and the movement is smooth and without jamming, effectively reducing transmission noise and component wear, and improving the working stability and service life of the telescopic component.

[0043] See Figures 1-4In other embodiments, the drive assembly includes: a reciprocating screw 43, a nut seat 44, a lever plate 45, a connecting unit, and a motor; the reciprocating screw 43 is rotatably mounted on the base 31, and the reciprocating screw 43 is coaxially arranged with the spline shaft 42; the connecting unit connects the reciprocating screw 43 and the spline shaft 42 to rotate synchronously; the motor drives the reciprocating screw 43 to rotate; the nut seat 44 is threadedly connected to the reciprocating screw 43; both ends of the tapered abutment 41 are respectively provided with lever plates 45, both lever plates 45 are coaxially rotatably connected to the tapered abutment 41, and both lever plates 45 are fixed on the nut seat 44.

[0044] In practice, the motor drives the reciprocating screw 43 to rotate, and the reciprocating screw 43 drives the spline shaft 42 to rotate synchronously through the connecting unit, thereby causing the tapered abutment 41 to rotate synchronously with the spline shaft 42, providing rotational power for the telescopic movement of the telescopic assembly. Simultaneously, the reciprocating screw 43 drives the nut seat 44 to reciprocate along its axial direction, and the nut seat 44 drives the actuating plates 45 at both ends to move axially synchronously. The actuating plates 45 push the tapered abutment 41 to slide axially on the spline shaft 42, thereby adjusting the contact between the tapered abutment 41 and the spline shaft 42. The contact height of roller 35 completes the adjustment of the tilt angle of road surface simulation mechanism 2; the drive component, through the cooperation of a single motor and reciprocating screw 43, synchronously realizes the circumferential rotation and axial movement of conical contact part 41. The power is concentrated and the linkage is strong, which effectively ensures the synchronization of tilt angle adjustment and bump simulation action. The reciprocating screw 43 can realize the automatic reciprocating motion of nut seat 44 without the need for an additional reversing mechanism. The structure is simple and compact, the transmission is stable and reliable, and the integration of the device and the accuracy of test condition simulation are significantly improved.

[0045] See Figures 1-4 In other embodiments, the connecting unit includes a first pulley 46, a second pulley 47, and a transmission belt 48. The first pulley 46 rotates synchronously with the reciprocating screw 43, the second pulley 47 rotates synchronously with the splined shaft 42, and the transmission belt 48 connects the first pulley 46 and the second pulley 47. Specifically, in the connecting unit, the first pulley 46 rotates synchronously with the reciprocating screw 43, and the transmission belt 48 drives the second pulley 47 to rotate synchronously. The second pulley 47 then drives the splined shaft 42 to rotate at the same speed and in the same direction as the reciprocating screw 43, achieving stable power transmission. Furthermore, the connecting unit can also be a structure capable of driving two shafts to rotate synchronously, such as a chain drive, gear drive, or synchronous belt drive.

[0046] Furthermore, the connecting unit also includes: a plug shaft 49, which is plugged into the base 31 through a round hole; the plug shaft 49 is coaxially arranged with the reciprocating screw 43, and the end of the plug shaft 49 near the reciprocating screw 43 is tapered and has a toothed structure, and the end of the reciprocating screw 43 near the plug shaft 49 has a tapered limiting groove that cooperates with the end of the plug shaft 49 near the reciprocating screw 43; the first pulley 46 is rotatably mounted on the base 31, and the first pulley 46 is splinedly connected to the plug shaft 49. In practice, the engagement and disengagement of the sliding plug shaft 49 with the reciprocating screw 43 can be controlled by the sliding plug shaft 49. When the plug shaft 49 slides towards the reciprocating screw 43 and inserts into the conical limiting groove, the conical structure and toothed structure at the end of the plug shaft 49 achieve radial centering and circumferential meshing, respectively, so that the first pulley 46 rotates synchronously with the reciprocating screw 43 through the plug shaft 49, and then drives the spline shaft 42 to rotate through the transmission belt 48 and the second pulley 47, providing the vibration simulation power for the telescopic assembly. When the plug shaft 49 slides in the opposite direction and disengages from the reciprocating screw 43, the power transmission between the first pulley 46 and the reciprocating screw 43 is cut off, the spline shaft 42 and the conical abutment 41 stop rotating, and the telescopic movement of the telescopic assembly stops, retaining only the tilt angle adjustment function. This connecting unit can independently control the start and stop of the vibration simulation action through the clutch structure of the plug shaft 49, realizing the step-by-step or linkage control of tilt angle adjustment and vibration simulation, adapting to different test conditions.

[0047] See Figures 1-4 In other embodiments, the frame 1 includes: a base 11, a frame 12, a fixed seat 13, and a cylinder 14; the road surface simulation mechanism 2, the road condition simulation mechanism 3, and the drive mechanism 4 are all mounted on the base 11; the frame 12 is mounted above the base 11; the fixed seat 13 is mounted on the frame 12 via the cylinder 14; the fixed seat 13 is detachably connected to the suspension 5 to be tested.

[0048] In practice, cylinder 14 drives the fixed seat 13 to lift and lower on the frame 12, quickly clamping and positioning the suspension 5 to be tested on the fixed seat 13, and keeping the tire of the suspension 5 to be tested in stable contact with the road simulation mechanism 2, providing a reliable installation benchmark for fatigue testing. The frame 1 structure realizes the adaptive clamping and quick assembly / disassembly of the fixed seat 13 through cylinder 14, which has high clamping efficiency and reliable positioning accuracy, ensuring that the installation position of the suspension 5 to be tested is stable and does not shift during the test. At the same time, it adapts to the clamping requirements of different specifications of suspensions, improving the versatility of the device and the convenience of test operation.

[0049] See Figures 1-4In another embodiment, the road surface simulation mechanism 2 includes: a simulation frame 21; a first rotating roller 22, a second rotating roller 23, a flat belt 24, a load-bearing roller 25, a tensioning roller 26, and a driving member; one end of the simulation frame 21 is hinged to the frame 1; the first rotating roller 22, the second rotating roller 23, the load-bearing roller 25, and the tensioning roller 26 are rotatably mounted on the simulation frame 21, and the axis of the first rotating roller 22 is coaxial with the hinge of the simulation frame 21, and the axis of the second rotating roller 23 is coaxial with the hinge of the telescopic assembly; the flat belt 24 is sleeved on the first rotating roller 22 and the second rotating roller 23, and the tensioning roller 26 tensions the flat belt 24; a plurality of load-bearing rollers 25 are disposed inside the flat belt 24, and the plurality of load-bearing rollers 25 abut against the side of the flat belt 24 near the suspension 5 to be tested; the driving member drives the first rotating roller 22 to rotate.

[0050] In practice, the driving component drives the first rotating roller 22 to rotate, which in turn drives the flat belt 24 mounted on it to move synchronously. The flat belt 24, in cooperation with the second rotating roller 23, achieves cyclic rotation, simulating the relative rolling motion between the road surface and the tires when a vehicle is in motion. The tension roller 26 continuously tensions the flat belt 24 to ensure that it does not slip or deviate during its movement, thus ensuring the stability and continuity of the simulated road surface. Multiple load-bearing rollers 25 installed inside the flat belt 24 abut against the side of the flat belt 24 closest to the suspension 5 under test, shaping the flat belt 24. The system provides stable support, preventing the flat belt 24 from denting or deforming under tire pressure, ensuring that the surface of the flat belt 24 remains flat and realistically simulating the support state of a flat or sloping road surface. At the same time, the simulation frame 21 can rotate around its hinge point with the frame 1 under the drive of the telescopic component, adjusting the tilt angle. The flat belt 24 tilts synchronously with the simulation frame 21. With the cyclic rotation of the flat belt 24, the rolling friction scenario when the vehicle is driving on different slopes can be reproduced. Combined with the bumpy action of the road condition simulation mechanism 3, the realism of the road condition simulation is further improved.

[0051] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A fatigue testing device suitable for suspensions, characterized in that, include: A rack is used to mount the suspension to be tested; A road surface simulation mechanism abuts against a tire on the suspension to be tested, with one end of the road surface simulation mechanism hinged to the frame; The road condition simulation mechanism includes: a base and a telescopic assembly; The base is slidably mounted on the frame along the length of the road surface simulation mechanism; one end of the telescopic component is slidably mounted on the base in the vertical direction; and the other end of the telescopic component is hinged to the other end of the road surface simulation mechanism. The drive mechanism drives the telescopic component to extend and retract at different heights to simulate the bumpy road conditions of the suspension under test on roads with different inclination angles.

2. The fatigue testing device for suspensions according to claim 1, characterized in that, The drive mechanism includes a tapered abutment and a drive assembly; the axis of the tapered abutment is parallel to the axis of the hinge of the telescopic assembly, and the tapered abutment is slidably mounted on the base along the axial direction; the end of the telescopic assembly away from the road surface simulation mechanism slides against the tapered abutment; the drive assembly drives the tapered abutment to slide, thereby changing the tilt angle of the road surface simulation mechanism by changing the overall height of the telescopic assembly; and the drive assembly synchronously drives the telescopic assembly to extend and retract, thereby simulating bumpy road conditions on the suspension road surface to be tested.

3. The fatigue testing device for suspensions according to claim 2, characterized in that, The conical abutment is conical in shape and is mounted on a base via a splined shaft. The splined shaft is rotatably mounted on the base, and the conical abutment is splinedly connected to the splined shaft. The telescopic assembly includes a connecting seat, a sleeve, a column, a transmission unit, and a roller. The connecting seat is slidably mounted on the base in the vertical direction. One end of the connecting seat is hinged to the end of the road surface simulation mechanism. The other end of the connecting seat is fitted with a sleeve, one end of the column is slidably inserted into the sleeve, and the other end of the column is rotatably fitted with a roller. The roller abuts against the conical abutment. The driving assembly moves the conical abutment to slide back and forth on the splined shaft, and the driving assembly drives the roller to rotate by driving the conical abutment to rotate. The transmission unit drives the column to slide back and forth within the sleeve by the rotation of the roller.

4. The fatigue testing device for suspensions according to claim 3, characterized in that, The transmission unit includes a disc and a connecting rod; the disc is coaxially fixed with the roller, one end of the connecting rod is eccentrically hinged to one side of the disc, and the other end of the connecting rod is hinged to the sleeve.

5. A fatigue testing device suitable for suspensions according to claim 3, characterized in that, The drive assembly includes: a reciprocating lead screw, a nut seat, a lever plate, a connecting unit, and a motor; the reciprocating lead screw is rotatably mounted on the base and is coaxially arranged with the spline shaft; the connecting unit connects the reciprocating lead screw and the spline shaft to rotate synchronously; the motor drives the reciprocating lead screw to rotate; the nut seat is threadedly connected to the reciprocating lead screw; both ends of the tapered abutment are respectively provided with lever plates, both lever plates are coaxially rotatably connected to the tapered abutment, and both lever plates are fixed on the nut seat.

6. A fatigue testing device suitable for suspensions according to claim 5, characterized in that, The connecting unit includes: a first pulley, a second pulley, and a transmission belt; the first pulley rotates synchronously with the reciprocating lead screw, the second pulley rotates synchronously with the spline shaft, and the transmission belt connects the first pulley and the second pulley.

7. A fatigue testing device suitable for suspensions according to claim 6, characterized in that, The connecting unit further includes: a plug shaft, which is plugged into the base through a round hole; the plug shaft is coaxially arranged with the reciprocating screw, and the end of the plug shaft near the reciprocating screw is tapered and has a toothed structure; the end of the reciprocating screw near the plug shaft has a tapered limiting groove that mates with the end of the plug shaft near the reciprocating screw; the first pulley is rotatably mounted on the base, and the first pulley is splinedly connected to the plug shaft.

8. A fatigue testing device suitable for suspensions according to claim 1, characterized in that, The frame includes a base, a frame body, a fixed seat, and a cylinder; the road surface simulation mechanism, the road condition simulation mechanism, and the drive mechanism are all mounted on the base; the frame body is mounted above the base; the fixed seat is mounted on the frame body via the cylinder; the fixed seat is detachably connected to the suspension to be tested.

9. A fatigue testing device suitable for suspensions according to claim 1, characterized in that, The road surface simulation mechanism includes: a simulation frame; a first rotating roller, a second rotating roller, a flat belt, a load-bearing roller, a tensioning roller, and a driving component; one end of the simulation frame is hinged to the machine frame; the first rotating roller, the second rotating roller, the load-bearing roller, and the tensioning roller are rotatably mounted on the simulation frame, and the axis of the first rotating roller is coaxial with the hinge of the simulation frame, and the axis of the second rotating roller is coaxial with the hinge of the telescopic assembly; the flat belt is sleeved on the first rotating roller and the second rotating roller, and the tensioning roller tensions the flat belt; a plurality of load-bearing rollers are disposed within the flat belt, and the plurality of load-bearing rollers abut against the side of the flat belt near the suspension to be tested; the driving component drives the first rotating roller to rotate.

10. A fatigue testing device suitable for suspensions according to claim 1, characterized in that, There are two parallel road surface simulation mechanisms, road condition simulation mechanisms, and drive mechanisms.

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