McPherson suspension front control arm assembly durability test system and method

Abstract

The present invention provides a durability test system and method for a McPherson suspension front control arm assembly. The system includes a ball head loading and restraining tooling, a rotating tooling and a controller. The ball head loading and restraining tooling includes: a fixed block, a first side surface of which is connected to a ball head of a front control arm assembly; a lateral loading rod, a first end of which is connected to a second side surface of the fixed block; a lateral actuator, which is connected to a second end of the lateral loading rod; a longitudinal loading rod, a first end of which is connected to a third side surface of the fixed block; a longitudinal actuator, which is connected to a second end of the longitudinal loading rod; a restraining assembly, which is connected to a fourth side surface of the fixed block; the rotating tooling includes: two lateral fixing plates arranged opposite to each other; a rotating tube, two ends of which are rotatably connected to the two lateral fixing plates in an extending direction; a bushing fixing assembly, which is connected to an outer wall of the rotating tube; a rotating loading block, which is connected to the outer wall of the rotating tube; and a rotating actuator, which is connected to the rotating loading block. The controller is communicatively connected to the lateral actuator, the longitudinal actuator and the rotating actuator.

Description

Technical Field

[0001] The present invention relates to the field of vehicle technology, and in particular to a McPherson suspension front control arm assembly durability test system and method. Background Art

[0002] The McPherson suspension front control arm assembly includes a control arm body, a ball head connected to the three free ends of the control arm body, a front frame bushing, and a rear frame bushing. The ball head is connected to the steering knuckle to connect the McPherson suspension front control arm to the wheel, the front frame bushing is connected to the front subframe, and the rear frame bushing is connected to the rear subframe.

[0003] The front control arm assembly is a guiding and force-transmitting element in the vehicle's suspension system, transferring various forces acting on the wheels to the vehicle body while ensuring the wheels follow a defined trajectory. Its durability is a crucial criterion for verifying the design's suitability. Currently, most tests for the durability of front control arm assemblies apply a single load in the vehicle's X-direction (lengthwise) or Y-direction (widthwise). However, during actual driving, the front control arm assembly is subjected to simultaneous loads in both the X and Y directions. Furthermore, the front control arm assembly is not only subject to linear loads in both directions but also experiences angular oscillation around the subframe connection axis when operating on undulating and bumpy roads. Therefore, it is crucial to accurately reflect the load conditions experienced by the front control arm assembly on real-world roads and objectively demonstrate its durability under actual operating conditions. Summary of the Invention

[0004] In view of this, the present invention provides a McPherson suspension front control arm assembly durability test system and method, so as to objectively reflect the durability performance of the front control arm assembly under actual use conditions.

[0005] The McPherson suspension front control arm assembly durability test system provided by the present invention includes a ball head loading and restraining tool, a rotating tool and a controller;

[0006] The ball head loading constraint tooling comprises:

[0007] a fixing block, wherein a first side surface of the fixing block is used to connect with a ball head of a front control arm assembly;

[0008] a side loading rod, a first end of the side loading rod being connected to the second side surface of the fixing block, the second side surface being disposed opposite to the first side surface;

[0009] a lateral actuator, wherein an output end of the lateral actuator is connected to the second end of the lateral loading rod;

[0010] a longitudinal loading rod, wherein a first end of the longitudinal loading rod is connected to the third side surface of the fixing block, and the longitudinal loading rod and the lateral loading rod are vertically arranged in the same horizontal plane;

[0011] a longitudinal actuator, wherein an output end of the longitudinal actuator is connected to the second end of the longitudinal loading rod;

[0012] a restraining assembly connected to the fourth side surface of the fixing block to restrain movement of the fixing block;

[0013] The rotary tooling comprises:

[0014] Two lateral fixing plates, the two lateral fixing plates are arranged opposite to each other;

[0015] A rotating tube, wherein opposite ends of the rotating tube in the extending direction are rotatably connected to the two lateral fixing plates respectively;

[0016] A bushing fixing assembly, the bushing fixing assembly is fixedly connected to the outer wall of the rotating tube, and includes a front bushing fixing seat and a rear bushing fixing seat;

[0017] a rotating loading block connected to the outer wall of the rotating tube;

[0018] a rotary actuator, wherein an output end of the rotary actuator is connected to the rotary loading block;

[0019] The output end of the controller is communicatively connected to the control ends of the lateral actuator, the longitudinal actuator, and the rotary actuator.

[0020] Optionally, the rotary tool further includes:

[0021] Two stand columns, one of the stand columns is connected to one of the lateral fixing plates;

[0022] A fixed base plate, wherein the two stand columns are respectively fixedly connected to the fixed base plate.

[0023] Optionally, the lateral loading rod is connected to the lateral actuator via a ball joint; the longitudinal loading rod is connected to the longitudinal actuator via a ball joint.

[0024] Optionally, the constraint component includes:

[0025] a restraining rod, wherein a first end of the restraining rod is connected to the fixing block via a ball joint;

[0026] A load-bearing member is connected to the second end of the restraining rod and applies pressure to the restraining rod.

[0027] Optionally, a connecting cover plate is fixed on the fourth side surface of the fixing block, and the restraining rod is connected to the connecting cover plate.

[0028] Optionally, the two opposite ends of the rotating tube in the extension direction are respectively fixedly connected with a rotating shaft, the rotating shaft passes through the lateral fixing plate and is rotatably connected to the lateral fixing plate; the end of the rotating shaft exposed from the lateral fixing plate is sleeved with a limit piece.

[0029] Optionally, two groups of the bushing fixing assemblies are fixed on the outer wall of the rotating tube, and the two groups of the bushing fixing assemblies are symmetrically arranged about the axis of the rotating tube.

[0030] Optionally, a plurality of the rotating loading blocks are fixed at circumferential intervals on the outer wall of the rotating tube.

[0031] The present invention further provides a method for testing the durability of a front control arm assembly of a McPherson suspension, based on any one of the above-mentioned systems for testing the durability of a front control arm assembly of a McPherson suspension, comprising the following steps:

[0032] Obtaining an X-axis time-domain force signal of the front control arm assembly in the vehicle body length direction, a Y-axis time-domain force signal in the vehicle body width direction, and a time-domain swing angle signal of the front control arm assembly;

[0033] Connecting the ball head of the front control arm assembly to the fixing block, and connecting the front frame bushing and the rear frame bushing of the front control arm assembly to the front bushing fixing seat and the rear bushing fixing seat in the same bushing fixing assembly respectively;

[0034] According to the X-axis time-domain force signal, the Y-axis time-domain force signal, and the time-domain swing angle signal, the output power data of the longitudinal actuator, the lateral actuator, and the rotary actuator are respectively obtained, and the actions of the longitudinal actuator, the lateral actuator, and the rotary actuator are respectively controlled according to the respective output power data.

[0035] Optionally, before the step of obtaining the output power data of the longitudinal actuator, the lateral actuator, and the rotary actuator, the following steps are further included:

[0036] The X-axis time-domain force signal, the Y-axis time-domain force signal, and the time-domain swing angle signal are respectively iterated for multiple rounds to obtain an X-axis iterative time-domain force signal, a Y-axis iterative time-domain force signal, and an iterative time-domain swing angle signal.

[0037] Compared with the prior art, the above technical solution provided by the present invention has at least the following beneficial effects:

[0038] The McPherson suspension front control arm assembly durability test system and method of the present invention controls the loads applied to the longitudinal loading rod and the lateral loading rod by the longitudinal actuator and the lateral actuator based on actual data, that is, controls the loads applied to the ball head of the front control arm assembly in the X and Y directions. Simultaneously, the rotary actuator controls the swing angle of the rotary loading block based on the actual data, that is, controls the swing angle of the front control arm assembly. Therefore, the load conditions of the front control arm assembly on actual vehicle roads can be truly reflected, and the durability performance of the front control arm assembly under actual usage conditions can be objectively reflected. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A schematic diagram of a McPherson suspension front control arm assembly durability test system according to one embodiment of the present invention;

[0040] Figure 2 for Figure 1 Schematic diagram of the rotating fixture of the McPherson suspension front control arm assembly durability test system.

[0041] Reference numerals:

[0042] 1: Ball head loading constraint fixture; 11: Fixed block; 12: Lateral loading rod; 13: Longitudinal loading rod; 14: Constraint assembly; 141: Constraint rod; 142: U-shaped block; 15: Ball joint; 16: Connecting cover; 2: Rotating fixture; 21: Lateral fixing plate; 22: Rotating tube; 23: Bushing fixing assembly; 231: Front bushing fixing seat; 232: Rear bushing fixing seat; 24: Rotating loading block; 25: Rotating shaft; 26: Limiting piece; 3: Front control arm assembly; 31: Control arm body; 32: Front frame bushing; 33: Rear frame bushing. DETAILED DESCRIPTION

[0043] The embodiments of the present invention will be further described below with reference to the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only simplified descriptions for the convenience of describing the present invention, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second" and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0044] Figure 1 A schematic diagram of a McPherson suspension front control arm assembly durability test system according to one embodiment of the present invention; Figure 2 for Figure 1Schematic diagram of the rotating fixture of the McPherson suspension front control arm assembly durability test system.

[0045] like Figure 1 and Figure 2 As shown, the McPherson suspension front control arm assembly durability test system includes a ball head loading and restraining fixture 1, a rotating fixture 2 and a controller (not shown).

[0046] The ball head loading and restraining tool 1 includes a fixed block 11, a lateral loading rod 12, a lateral actuator (not shown), a longitudinal loading rod 13, a longitudinal actuator (not shown), and a restraining assembly 14. The first side surface of the fixed block 11 is used to connect to the ball head of the front control arm assembly 3; the first end of the lateral loading rod 12 is connected to the second side surface of the fixed block 11, and the second side surface is arranged opposite to the first side surface; the output end of the lateral actuator is connected to the second end of the lateral loading rod 12; the first end of the longitudinal loading rod 13 is connected to the third side surface of the fixed block 11, and the longitudinal loading rod 13 and the lateral loading rod 12 are arranged vertically in the same horizontal plane; the output end of the longitudinal actuator is connected to the second end of the longitudinal loading rod 13; and the restraining assembly 14 is connected to the fourth side surface of the fixed block 11 to restrain the movement of the fixed block 11.

[0047] The rotary tooling 2 includes two lateral fixing plates 21, a rotating tube 22, a bushing fixing assembly 23, a rotating loading block 24, and a rotary actuator (not shown). The two lateral fixing plates 21 are arranged opposite each other; the rotating tube 22 has two opposite ends rotatably connected to the two lateral fixing plates 21; the bushing fixing assembly 23 is fixedly connected to the outer wall of the rotating tube 22 and includes a front bushing fixing seat 231 and a rear bushing fixing seat 232; the rotating loading block 24 is connected to the outer wall of the rotating tube 22; and the output end of the rotary actuator is connected to the rotating loading block 24.

[0048] The output end of the controller is communicatively connected to the control ends of the lateral actuator, the longitudinal actuator and the rotary actuator.

[0049] like Figure 1As shown, the front control arm assembly 3 includes a control arm body 31, a ball joint connected to the three free ends of the control arm body 31, a front frame bushing 32, and a rear frame bushing 33. Before conducting the durability test, it is necessary to collect the X-axis time-domain force signal of the ball joint of the front control arm assembly 3 in the vehicle's X direction, the Y-axis time-domain force signal in the vehicle's Y direction, and the time-domain swing angle signal of the front control arm assembly 3 about the subframe connection axis while the vehicle is driving on the road test track. While the vehicle is driving on the road test track, two force sensors are installed on the front control arm assembly 3 to monitor the time-dependent force changes of the ball joint in the X and Y directions, respectively. An angle sensor is also installed to monitor the time-dependent swing angle changes of the front control arm assembly 3 about the subframe connection axis. The monitored X-axis time-domain force signal, Y-axis time-domain force signal, and time-domain swing angle signal are transmitted and stored to the controller.

[0050] During the endurance test using this system, the ball joint of the front control arm assembly 3 is connected to the fixing block 11, and the front frame bushing 32 and rear frame bushing 33 of the front control arm assembly 3 are connected to the front bushing fixing seat 231 and rear bushing fixing seat 232, respectively. Based on the X-axis time-domain force signal, Y-axis time-domain force signal, and time-domain swing angle signal, the controller calculates the output power data for the corresponding lateral, longitudinal, and rotary actuators. Based on the output power data, the controller then sends action signals to the lateral, longitudinal, and rotary actuators, respectively. Upon receiving the corresponding action signals, the lateral actuator applies a corresponding load to the lateral load rod 12. The load changes correspond to the Y-axis force changes experienced by the ball joint of the front control arm assembly 3 when the vehicle is driving on the road test track. The longitudinal actuator receives the corresponding action signal, thereby applying a corresponding load to the longitudinal loading rod 13, and the load variation is consistent with the force variation of the ball head of the front control arm assembly 3 in the X-axis direction when the vehicle is driving on the road test track. The rotary actuator receives the corresponding action signal, and the length of its output end protruding varies with time, thereby driving the rotary loading block 24, rotating tube 22, and bushing fixing assembly 23 directly or indirectly connected thereto to swing at a certain angle relative to the lateral fixing plate 21, further driving the front frame bushing 32 and rear frame bushing 33 connected to the bushing fixing assembly 23 to swing synchronously, and the swing angle variation is consistent with the swing angle variation of the front control arm assembly 3 about the subframe connection axis when the vehicle is driving on the road test track. That is, through the linear loading of the rotary actuator, the rotating tube 22 rotates about its axis, driving the front control arm assembly 3 to simulate the swing posture of the entire vehicle. During the test, the restraint assembly 14 continuously applies a load to the fixed block 11, preventing it from moving horizontally or vertically when loads are applied to the lateral load rod 12 and longitudinal load rod 13, and when the front frame bushing 32 and rear frame bushing 33 of the front control arm assembly 3 swing with the rotating tube 22. The X-axis time-domain force signal, the Y-axis time-domain force signal, and the time-domain swing angle signal are accumulated for a certain number of cycles, i.e., the test process is repeated to obtain the durability test results of the front control arm assembly 3.

[0051] By using the McPherson suspension front control arm assembly durability test system of the present invention, the loads applied by the longitudinal actuator and the lateral actuator to the longitudinal loading rod 13 and the lateral loading rod 12 are controlled according to actual data, that is, the loads applied to the ball head of the front control arm assembly 3 in the X and Y directions are controlled. At the same time, the swing angle of the rotary loading block 24 is controlled by the rotary actuator according to the actual data, that is, the swing angle of the front control arm assembly 3 is controlled. Therefore, the load condition of the front control arm assembly 3 on the actual vehicle road can be truly reflected, and the durability performance of the front control arm assembly 3 under actual usage conditions can be objectively reflected.

[0052] like Figure 1As shown, in this embodiment, the fixed block 11 is configured as a rectangular parallelepiped. The right side of the fixed block 11 is connected to the ball head of the front control arm assembly 3, the opposite left side is threadedly connected to the right end of the lateral load rod 12, the front side is threadedly connected to the left end of the longitudinal load rod 13, and the top side is connected to the constraint assembly 14. The lateral load rod 12 and the longitudinal load rod 13 are vertically arranged on the same horizontal plane, and the axes of both pass through the center of the ball head. When loads are applied to the X-axis and Y-axis and the rotary actuator drives the rotating tube 22 to rotate, the constraint assembly 14 continuously applies external force to the top of the fixed block 11 to prevent the fixed block 11 from moving horizontally or vertically under the X-axis and Y-axis loads and the ball head of the front control arm assembly 3. The rotating tube 22 is rotatably connected to the lateral fixed plate 21 at both ends by bearings. To facilitate lightweighting and reduce rotational inertia, the rotating tube 22 is configured as a hollow circular tube. A front bushing fixing seat 231 and a rear bushing fixing seat 232 are fixed to the outer wall of the rotating tube 22 and are spaced apart in the axial direction. The front frame bushing 32 and the rear frame bushing 33 are bolted to the front bushing fixing seat 231 and the rear bushing fixing seat 232 respectively. Figure 1 and Figure 2 As shown, the front bushing mount 231 is U-shaped, with mounting holes pre-set on either side of the opening. Bolts pass through the mounting holes of the front frame bushing 32 and the front bushing mount 231 to connect the two. Mounting holes are also provided on the surface of the rear bushing mount 232, and bolts pass through the mounting holes of the rear frame bushing 33 and the rear bushing mount 232 to connect the two. The rotary loading block 24 is also U-shaped, with its opening facing away from the rotating tube 22. The output end of the rotary actuator is inserted into the opening of the rotary loading block 24, and the two are connected by a threaded pin. In this embodiment, the lateral actuator, longitudinal actuator, and rotary actuator all utilize hydraulic servo actuators. Depending on the actual application, the constraint assembly 14 can adopt any structural form, which can be a separate load-bearing block or a combination of multiple components, as long as it can apply longitudinal pressure to the fixed block 11 to prevent the fixed block 11 from moving horizontally or longitudinally during the process of applying load to the lateral loading rod 12, the longitudinal loading rod 13 and the rotational loading block 24; the front bushing fixing seat 231 and the rear bushing fixing seat 232 can also adopt any structural form, as long as they can achieve a stable connection with the front frame bushing 32 and the rear frame bushing 33.

[0053] Optionally, the rotary fixture 2 also includes two stand columns (not shown) and a fixed base plate (not shown). One stand column is connected to a lateral fixed plate 21; the other two stand columns are respectively fixedly connected to the fixed base plate. The connection with the stand columns and the fixed base plate provides a more stable structure for the lateral fixed plate 21, thereby further stabilizing the entire rotary fixture 2 during testing.

[0054] The fixed base plate is fixed to the test platform of the laboratory, the two stand columns are vertically connected to the fixed base plate respectively, and the lateral fixing plate 21 is detachably connected to the stand columns by bolts.

[0055] Optionally, the lateral loading rod 12 is connected to the lateral actuator via a ball joint 15, and the longitudinal loading rod 13 is connected to the longitudinal actuator via a ball joint 15. The ball joint connection can decouple the influence of the force in the other direction on the direction, prevent the loads in the X-axis and Y-axis directions from interfering with each other, and ensure the accuracy of the test results.

[0056] like Figure 1 As shown, the ends of the lateral loading rod 12 and the longitudinal loading rod 13 away from the fixed block 11 are connected to a ball joint 15, which is connected to the lateral actuator and the longitudinal actuator through the ball joint 15, so that a certain angle of rotation can be generated between the lateral loading rod 12 and the lateral actuator, and between the longitudinal loading rod 13 and the longitudinal actuator.

[0057] Optionally, the restraint assembly 14 includes a restraint rod 141 and a load-bearing member (not shown). The first end of the restraint rod 141 is connected to the fixed block 11 via a ball joint 15. The load-bearing member is connected to the second end of the restraint rod 141 to apply pressure to the restraint rod 141. The combination of the restraint rod 141 and the load-bearing member provides greater flexibility in the assembly space of the restraint assembly 14. Furthermore, the restraint rod 141, connected to the fixed block 11 via the ball joint 15, allows for a certain degree of angular movement between the two, thus avoiding damage to the connection caused by excessive loads due to rigid restraint.

[0058] like Figure 1 As shown, in this embodiment, the upper and lower ends of the restraining rod 141 are connected to the ball joint 15, and the upper end is connected to the load-bearing member through the ball joint 15. A U-shaped block 142 is fixed to the top surface of the fixed block 11, and the opening faces upward. The U-shaped blocks 142 on both sides of the opening have mounting holes. The ball joint 15 connected to the lower end of the restraining rod 141 is placed in the opening. The threaded pins pass through the mounting holes in the center of the U-shaped block 142 and the ball joint 15 in sequence to connect the U-shaped block 142 and the ball joint 15. The load-bearing member can be a single load-bearing block or a structural assembly composed of multiple connected parts. As long as it can apply pressure to the restraining rod 141 and prevent the fixed block 11 from moving, it can be used.

[0059] Optionally, a connecting cover plate 16 is fixed to the fourth side of the fixing block 11, and the connecting cover plate 16 is connected to the restraining rod 141. The addition of the connecting cover plate 16 makes the connection between the restraining rod 141 and the fixing block 11 not limited by the size of the fixing block 11, thereby improving the flexibility of the installation of the restraining rod 141.

[0060] The fixing block 11 needs to be customized according to the ball head type and size of different models, while the shape and size of the connecting cover 16 can be adjusted arbitrarily, such as Figure 1As shown, in this embodiment, the connecting cover plate 16 is generally rectangular, with a cross-sectional shape that is substantially identical to the top surface of the fixing block 11. The connecting cover plate 16 is bolted to the top surface of the fixing block 11 and is also bolted to the U-shaped block 142 that connects to the restraining rod 141. Depending on the actual application, the shape and dimensions of the connecting cover plate 16 can be adjusted to meet the installation requirements of the restraining rod 141.

[0061] Optionally, a rotation shaft 25 is fixedly connected to opposite ends of the rotating tube 22 in its extension direction. The rotation shaft 25 passes through the lateral fixing plate 21 and is rotatably connected thereto. A stopper 26 is sleeved on the end of the rotation shaft 25 that protrudes from the lateral fixing plate 21. The stopper 26 constrains the position of the rotating tube 22. If the rotating tube 22 deviates axially during rotation, the stopper 26 abuts against the lateral fixing plate 21, preventing the rotation shaft 25 and the rotating tube 22 from separating from the lateral fixing plate 21.

[0062] like Figure 1 and Figure 2 As shown, in this embodiment, a rotating shaft 25 is fixed at the center of each end of the rotating tube 22 and is rotatably connected to the lateral fixing plate 21 on the same side via a bearing. The end of the rotating shaft 25 extending through the lateral fixing plate 21 is connected to a stopper 26. In this embodiment, the stopper 26 is a nut that is sleeved around the rotating shaft 25 and threadedly connected to the end of the rotating shaft 25. Depending on the actual application, the stopper 26 can be made of other structural components, as long as it can limit the axial movement of the rotating shaft 25 and the rotating tube 22 after being connected to the rotating shaft 25.

[0063] Optionally, two sets of bushing fixing assemblies 23 are fixed to the outer wall of the rotating tube 22, and the two sets of bushing fixing assemblies 23 are symmetrically arranged about the axis of the rotating tube 22. This arrangement allows for greater flexibility in the installation positions of the front frame bushings 32 and rear frame bushings 33 of the front control arm assembly 3 and the bushing fixing assemblies 23.

[0064] like Figure 1 and Figure 2 As shown, in this embodiment, the left and right sides of the rotating tube 22 are symmetrically connected to the bushing fixing assemblies 23, and the front bushing fixing seat 231 and the rear bushing fixing seat 232 in the bushing fixing assembly 23 are detachably connected to the rotating tube 22. For a variety of bushing hard points or bushing interface types, it is only necessary to replace the corresponding front bushing fixing seat 231 and the rear bushing fixing seat 232 and the specific connection position of the rotating tube 22.

[0065] Optionally, a plurality of rotating loading blocks 24 are fixed to the outer wall of the rotating tube 22 at intervals in the circumferential direction. This arrangement makes the connection position of the rotary actuator and the rotating tube 22 more flexible and facilitates the selection of a suitable connection position to prevent interference with other components during the operation.

[0066] like Figure 1 and Figure 2 As shown, in this embodiment, four rotating loading blocks 24 are arranged at equal intervals around the rotating tube 22. Each rotating loading block 24 is U-shaped as a whole, with its opening facing away from the rotating tube 22. Every two adjacent rotating loading blocks 24 are arranged vertically. Figure 1 As shown, the front frame bushing 32 and the rear frame bushing 33 are connected to the bushing fixing assembly 23 on the left side of the rotating tube 22. The rotary actuator can then be connected to the rotary loading block 24 on the upper side of the rotating tube 22, achieving a horizontal arrangement of the rotary actuator, pushing the rotary loading block 24 horizontally to rotate the rotating tube 22. The rotary actuator can also be connected to the rotary loading block 24 on the right side of the rotating tube 22, achieving a vertical arrangement of the rotary actuator, pushing the rotary loading block 24 vertically to rotate the rotating tube 22. The number of rotary loading blocks 24 provided and their specific arrangement positions on the outer wall of the rotating tube 22 can be adjusted according to actual application.

[0067] The present invention further provides a method for testing the durability of a front control arm assembly of a McPherson suspension, which is based on the system for testing the durability of a front control arm assembly of a McPherson suspension described in any of the above embodiments and includes the following steps:

[0068] Obtaining an X-axis time-domain force signal of the front control arm assembly 3 in the vehicle body length direction, a Y-axis time-domain force signal in the vehicle body width direction, and a time-domain swing angle signal of the front control arm assembly 3;

[0069] Connect the ball head of the front control arm assembly 3 to the fixing block 11, and connect the front frame bushing 32 and the rear frame bushing 33 of the front control arm assembly 3 to the front bushing fixing seat 231 and the rear bushing fixing seat 232 of the same bushing fixing assembly 23, respectively;

[0070] According to the X-axis time-domain force signal, the Y-axis time-domain force signal, and the time-domain swing angle signal, the output power data of the longitudinal actuator, the lateral actuator, and the rotary actuator are respectively obtained, and the actions of the longitudinal actuator, the lateral actuator, and the rotary actuator are respectively controlled according to the respective output power data.

[0071] Among them, when obtaining the X-axis time-domain force signal, the Y-axis time-domain force signal and the time-domain swing angle signal, the actual vehicle is driven on the road of the road test field, and a force sensor and an angle sensor are arranged on the front control arm assembly 3 of the actual vehicle to monitor the change of the load of the ball head of the front control arm assembly 3 in the X-axis and Y-axis directions over time, and the change of the swing angle of the front control arm assembly 3 around the subframe connection axis over time, and the monitored X-axis time-domain force signal, Y-axis time-domain force signal and time-domain swing angle signal are respectively transmitted and stored to the controller.

[0072] When conducting the durability test, the controller converts the monitored X-axis time-domain force signal, Y-axis time-domain force signal and time-domain swing angle signal into output power data for controlling the actions of the longitudinal actuator, lateral actuator and rotary actuator according to the set program, and controls the actions of the longitudinal actuator, lateral actuator and rotary actuator according to their respective output power data, so as to apply loads in the X and Y directions of the ball head of the front control arm assembly 3 that are consistent with the actual vehicle's actual operating conditions, and to cause the front control arm assembly 3 to swing at an angle that is consistent with the actual vehicle's actual operating conditions.

[0073] By adopting the durability test method for the McPherson suspension front control arm assembly of the present invention, the loads applied by the longitudinal actuator and the lateral actuator to the longitudinal loading rod 13 and the lateral loading rod 12 are controlled according to actual data, that is, the loads applied to the ball head of the front control arm assembly 3 in the X and Y directions are controlled. At the same time, the swing angle of the rotary loading block 24 is controlled by the rotary actuator according to the actual data, that is, the swing angle of the front control arm assembly 3 is controlled. Therefore, the load condition of the front control arm assembly 3 on the actual vehicle road can be truly reflected, and the durability performance of the front control arm assembly 3 under actual usage conditions can be objectively reflected.

[0074] Optionally, before the step of obtaining the output power data of the longitudinal actuator, the lateral actuator, and the rotary actuator, the method further includes the following steps:

[0075] The X-axis time-domain force signal, the Y-axis time-domain force signal, and the time-domain swing angle signal are respectively subjected to multiple rounds of iteration to obtain the X-axis iterative time-domain force signal, the Y-axis iterative time-domain force signal, and the iterative time-domain swing angle signal.

[0076] After multiple iterations, the iterative X-axis time-domain force signal, the iterative Y-axis time-domain force signal, and the iterative time-domain swing angle signal are obtained. Based on the iterative X-axis time-domain force signal, the iterative Y-axis time-domain force signal, and the iterative time-domain swing angle signal, the output power data for controlling the actions of the longitudinal actuator, the lateral actuator, and the rotary actuator are respectively obtained. Based on the output power data obtained by the iterative signal conversion, the X-direction load applied by the longitudinal actuator to the ball joint of the front control arm assembly 3, the Y-direction load applied by the lateral actuator to the ball joint of the front control arm assembly 3, and the swing angle applied by the rotary actuator to the front frame bushing 32 and the rear frame bushing 33 are all more closely aligned with the actual vehicle driving on the road, which makes the test results more objective and accurate.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements 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.

Claims

1. A McPherson suspension front control arm assembly durability test system, characterized in that: Includes ball head loading constraint fixture, rotation fixture and controller; The ball head loading constraint tooling comprises: a fixing block, wherein a first side surface of the fixing block is used to connect with a ball head of a front control arm assembly; a side loading rod, a first end of the side loading rod being connected to the second side surface of the fixing block, the second side surface being disposed opposite to the first side surface; a lateral actuator, wherein an output end of the lateral actuator is connected to the second end of the lateral loading rod; a longitudinal loading rod, wherein a first end of the longitudinal loading rod is connected to the third side surface of the fixing block, and the longitudinal loading rod and the lateral loading rod are vertically arranged in the same horizontal plane; a longitudinal actuator, wherein an output end of the longitudinal actuator is connected to the second end of the longitudinal loading rod; a restraining assembly connected to the fourth side surface of the fixing block to restrain movement of the fixing block; The rotary tooling comprises: Two lateral fixing plates, the two lateral fixing plates are arranged opposite to each other; A rotating tube, wherein opposite ends of the rotating tube in the extending direction are rotatably connected to the two lateral fixing plates respectively; A bushing fixing assembly, the bushing fixing assembly is fixedly connected to the outer wall of the rotating tube, and includes a front bushing fixing seat and a rear bushing fixing seat; a rotating loading block connected to the outer wall of the rotating tube; a rotary actuator, wherein an output end of the rotary actuator is connected to the rotary loading block; The output end of the controller is communicatively connected to the control ends of the lateral actuator, the longitudinal actuator, and the rotary actuator.

2. The McPherson suspension front control arm assembly durability test system according to claim 1, characterized in that: The rotary tooling also includes: Two stand columns, one of the stand columns is connected to one of the lateral fixing plates; A fixed base plate, wherein the two stand columns are respectively fixedly connected to the fixed base plate.

3. The McPherson suspension front control arm assembly durability test system according to claim 1 or 2, characterized in that: The side loading rod is connected to the side actuator via a ball joint; The longitudinal loading rod is connected to the longitudinal actuator via a ball joint.

4. The McPherson suspension front control arm assembly durability test system according to claim 1 or 2, characterized in that: The constraint component includes: a restraining rod, wherein a first end of the restraining rod is connected to the fixing block via a ball joint; A load-bearing member is connected to the second end of the restraining rod and applies pressure to the restraining rod.

5. The McPherson suspension front control arm assembly durability test system according to claim 4, characterized in that: A connecting cover plate is fixed on the fourth side surface of the fixing block, and the restraining rod is connected to the connecting cover plate.

6. The McPherson suspension front control arm assembly durability test system according to claim 1 or 2, characterized in that: Two opposite ends of the rotating tube in the extension direction are respectively fixedly connected with a rotating shaft, and the rotating shaft passes through the lateral fixing plate and is rotatably connected to the lateral fixing plate; A limiting piece is sleeved on one end of the rotating shaft that is exposed from the lateral fixing plate.

7. The McPherson suspension front control arm assembly durability test system according to claim 1 or 2, characterized in that: Two groups of the bushing fixing assemblies are fixed on the outer wall of the rotating tube, and the two groups of the bushing fixing assemblies are symmetrically arranged about the axis of the rotating tube.

8. The McPherson suspension front control arm assembly durability test system according to claim 1 or 2, characterized in that: A plurality of the rotating loading blocks are fixed on the outer wall of the rotating tube at intervals in the circumferential direction.

9. A McPherson suspension front control arm assembly durability test method, characterized in that: The McPherson suspension front control arm assembly durability test system according to any one of claims 1 to 8 comprises the following steps: Obtaining an X-axis time-domain force signal of the front control arm assembly in the vehicle body length direction, a Y-axis time-domain force signal in the vehicle body width direction, and a time-domain swing angle signal of the front control arm assembly; Connecting the ball head of the front control arm assembly to the fixing block, and connecting the front frame bushing and the rear frame bushing of the front control arm assembly to the front bushing fixing seat and the rear bushing fixing seat in the same bushing fixing assembly respectively; According to the X-axis time-domain force signal, the Y-axis time-domain force signal, and the time-domain swing angle signal, the output power data of the longitudinal actuator, the lateral actuator, and the rotary actuator are respectively obtained, and the actions of the longitudinal actuator, the lateral actuator, and the rotary actuator are respectively controlled according to the respective output power data.

10. The McPherson suspension front control arm assembly durability test method according to claim 9, characterized in that: Before the step of obtaining the output power data of the longitudinal actuator, the lateral actuator, and the rotary actuator, the method further includes the following steps: The X-axis time-domain force signal, the Y-axis time-domain force signal, and the time-domain swing angle signal are respectively iterated for multiple rounds to obtain an X-axis iterative time-domain force signal, a Y-axis iterative time-domain force signal, and an iterative time-domain swing angle signal.

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