Endurance test system and method for front control arm assembly of Macpherson suspension

Abstract

The invention provides an endurance test system and method for a front control arm assembly of a Macpherson suspension. The system comprises a ball head loading constraint tool, a rotating tool and a controller, the ball head loading constraint tool comprises a fixing block, wherein a first side surface of the fixing block is connected with a ball head of the front control arm assembly; the first end of the lateral loading rod is connected with the second side surface of the fixed block; the lateral actuator is connected with the second end of the lateral loading rod; the first end of the longitudinal loading rod is connected with the third side surface of the fixed block; the longitudinal actuator is connected with the second end of the longitudinal loading rod; the restraining assembly is connected with the fourth side face of the fixing block; the rotating tool comprises two lateral fixing plates which are oppositely arranged; the two ends of the rotating pipe in the extending direction are rotationally connected with the two lateral fixing plates; the lining fixing assembly is connected with the outer wall of the rotating pipe; the rotary loading block is connected with the outer wall of the rotary pipe; the rotary actuator is connected with the rotary loading block; the controller is in communication connection with the lateral actuator, the longitudinal actuator and the rotary actuator.

Description

Technical Field

[0001] The invention relates to the technical field of vehicles, and in particular to a durability test system and method for a MacPherson suspension front control arm assembly. 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, wherein the ball head is connected to the steering knuckle to achieve the connection between the McPherson suspension front control arm and 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 guide and force transmission element in the vehicle suspension system. It transmits various forces acting on the wheels to the vehicle body and ensures that the wheels move along a certain trajectory. Its durability is an important criterion for verifying whether the design is qualified. At present, most of the tests for the durability of the front control arm assembly are to apply a single load in the X direction (body length direction) or Y direction (body width direction) of the vehicle. However, during the actual driving process of the vehicle, the front control arm assembly will be loaded in the X direction and Y direction at the same time. Moreover, the front control arm assembly is not only subjected to linear loads in the X direction and Y direction, but also swings around the subframe connection axis at a certain angle when driving on undulating and bumpy road conditions. Therefore, it is very necessary to truly reflect the load conditions of the front control arm assembly on the actual vehicle road and objectively reflect the durability of the front control arm assembly under actual use conditions. Summary of the invention

[0004] In view of this, the present invention provides a MacPherson 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 comprises 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 which is connected to a second side surface of the fixing block, and the second side surface is arranged 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 constraint component, the constraint component being connected to the fourth side surface of the fixed block to constrain the movement of the fixed 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 two 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 comprises 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, the output end of which is connected to the rotary loading block;

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

[0020] Optionally, the rotary tool further comprises:

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

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

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

[0024] Optionally, the constraint component includes:

[0025] A restraining rod, a first end of which 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 to apply 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, two opposite ends of the rotating tube in the extension direction are respectively fixedly connected with rotating shafts, 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 exposed from the lateral fixing plate.

[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 also provides a MacPherson suspension front control arm assembly durability test method, based on any one of the MacPherson suspension front control arm assembly durability test systems described above, comprising the following steps:

[0032] Acquire 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 acquired, and the actions of the longitudinal actuator, the lateral actuator and the rotary actuator are respectively controlled according to each 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 also 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] By adopting the McPherson suspension front control arm assembly durability test system and method of the present invention, the loads applied by the longitudinal actuator and the lateral actuator to the longitudinal loading rod and the lateral loading rod are controlled according to actual data, that is, the loads applied to the ball head of the front control arm assembly in the X direction and the Y direction are controlled, and at the same time, the swing angle of the rotary loading block is controlled by the rotary actuator according to the actual data, that is, the swing angle of the front control arm assembly is controlled. Therefore, the load working condition of the front control arm assembly on the actual vehicle road can be truly reflected, and the durability performance of the front control arm assembly under the actual use working condition 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 an 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 tooling; 11: fixing 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 plate; 2: rotating tooling; 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: limiter; 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 in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are 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, rather than indicating or implying 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 an 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 comprises 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 with 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; 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 rotary tube 22, a bushing fixing assembly 23, a rotary loading block 24 and a rotary actuator (not shown). The two lateral fixing plates 21 are arranged opposite to each other; the two opposite ends of the rotary tube 22 in the extending direction are rotatably connected to the two lateral fixing plates 21 respectively; the bushing fixing assembly 23 is fixedly connected to the outer wall of the rotary tube 22, including a front bushing fixing seat 231 and a rear bushing fixing seat 232; the rotary loading block 24 is connected to the outer wall of the rotary tube 22; and the output end of the rotary actuator is connected to the rotary loading block 24.

[0048] The output end of the controller is communicatively connected with 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, and a ball head connected to the three free ends of the control arm body 31, a front frame bushing 32, and a rear frame bushing 33. Before the durability test, it is necessary to collect in advance the X-axis time-domain force signal of the ball head of the front control arm assembly 3 in the vehicle X direction, the Y-axis time-domain force signal in the vehicle Y direction, and the time-domain swing angle signal of the front control arm assembly 3 around the subframe connection axis when the vehicle is driving on the road test field. When the vehicle is driving on the road test field, two force sensors are arranged on the front control arm assembly 3 to monitor the changes of the force of the ball head of the front control arm assembly 3 in the X direction and the Y direction over time, and an angle sensor is arranged to monitor the changes 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.

[0050] When using this system for endurance testing, the ball head of the front control arm assembly 3 is connected to the fixing block 11, and the front frame bushing 32 and the rear frame bushing 33 of the front control arm assembly 3 are connected to the front bushing fixing seat 231 and the rear bushing fixing seat 232 respectively. The controller obtains the output power data of the corresponding lateral actuator, longitudinal actuator and rotary actuator through calculation according to the X-axis time domain force signal, the Y-axis time domain force signal and the time domain swing angle signal, and then sends action signals to the lateral actuator, the longitudinal actuator and the rotary actuator respectively according to each output power data. The lateral actuator receives the corresponding action signal, thereby applying the corresponding load to the lateral loading rod 12, and the load change is consistent with the force change of the ball head of the front control arm assembly 3 in the Y-axis direction when the vehicle is driving on the road of the road test field. The longitudinal actuator receives the corresponding action signal, thereby applying the corresponding load to the longitudinal loading rod 13, and the load change is consistent with the force change 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 field. The rotary actuator receives the corresponding action signal, so that the length of its output end protruding changes with time, thereby driving the rotary loading block 24, the rotary tube 22 and the bushing fixing assembly 23 directly or indirectly connected to it to swing at a certain degree relative to the lateral fixing plate 21, further driving the front frame bushing 32 and the rear frame bushing 33 connected to the bushing fixing assembly 23 to swing synchronously, and the change in the swing angle is consistent with the change in the swing angle of the front control arm assembly 3 around the subframe connection axis when the vehicle is driving on the road test field. That is, through the linear loading of the rotary actuator, the rotary tube 22 is rotated around its axis, and the front control arm assembly 3 is driven to simulate the swing posture of the whole vehicle. During the test, the restraint assembly 14 always applies load to the fixed block 11 to prevent the fixed block 11 from moving horizontally or longitudinally when the lateral load rod 12 and the longitudinal load rod 13 are loaded, and the front frame bushing 32 and the 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 according to a certain number of cycles, that is, the above test process is cycled to obtain the durability test result 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 direction and the Y direction 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 in the actual vehicle road can be truly reflected, and the durability performance of the front control arm assembly 3 under the actual use condition can be objectively reflected.

[0052] like Figure 1As shown, in this embodiment, the fixed block 11 is set 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 loading rod 12, the front side is threadedly connected to the left end of the longitudinal loading rod 13, the top surface is connected to the constraint component 14, and the lateral loading rod 12 and the longitudinal loading rod 13 are vertically arranged on the same horizontal plane, and the axes of both pass through the center of the ball head. In the process of applying loads on the X-axis and the Y-axis and the rotary actuator driving the rotating tube 22 to rotate, the constraint component 14 always applies external force to the top of the fixed block 11 to prevent the fixed block 11 from moving horizontally or longitudinally under the action of the X-axis and Y-axis loads and the ball head of the front control arm assembly 3. The two ends of the rotating tube 22 are rotatably connected to the lateral fixing plate 21 by means of bearings. In order to facilitate lightweighting and reduce the moment of inertia, the rotating tube 22 is set as a hollow round 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 fixing seat 231 is U-shaped as a whole, with mounting holes preset on both sides of the opening, and bolts pass through the mounting holes on the front frame bushing 32 and the front bushing fixing seat 231 to achieve the connection between the two; the surface of the rear bushing fixing seat 232 is also provided with mounting holes, and bolts pass through the mounting holes on the rear frame bushing 33 and the rear bushing fixing seat 232 to achieve the connection between the two. The rotating loading block 24 is also U-shaped as a whole, with the opening facing away from the rotating tube 22, and the output end of the rotating actuator is inserted into the opening of the rotating loading block 24, and the connection between the two is achieved by means of a threaded pin. In this embodiment, the lateral actuator, the longitudinal actuator and the rotating actuator all use hydraulic servo actuators. According to the actual application, the constraint assembly 14 can adopt any structural form, which can be a single load-bearing block or a combination of multiple parts, 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 rotating 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 tool 2 further includes two stand columns (not shown) and a fixed bottom plate (not shown). One stand column is connected to a lateral fixed plate 21; the two stand columns are fixedly connected to the fixed bottom plate respectively. With the connection with the stand columns and the fixed bottom plate, the structure of the lateral fixed plate 21 is more stable, and thus the entire rotary tool 2 is more stable during the test.

[0054] The fixed bottom plate is fixed to the test platform of the test room, two stand columns are respectively vertically connected to the fixed bottom plate, and the lateral fixed 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; 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 another direction on the current 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 with 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 constraint assembly 14 includes a constraint rod 141 and a load-bearing member (not shown). The first end of the constraint rod 141 is connected to the fixed block 11 through a ball joint 15; the load-bearing member is connected to the second end of the constraint rod 141 to apply pressure to the constraint rod 141. The cooperation between the constraint rod 141 and the load-bearing member makes the assembly space of the constraint assembly 14 more flexible, and the constraint rod 141 is connected to the fixed block 11 by means of the ball joint 15, so that there is a certain angle of activity space between the two, avoiding the use of rigid constraints and damage to the connection under excessive load conditions.

[0058] like Figure 1 As shown, in this embodiment, both the upper and lower ends of the constraint 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 is upward. The U-shaped blocks 142 on both sides of the opening are respectively provided with mounting holes. The ball joint 15 connected to the lower end of the constraint rod 141 is placed in the opening, and 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 achieve the connection between the U-shaped block 142 and the ball joint 15. The load-bearing member can be a separate load-bearing block or a structural assembly formed by connecting multiple parts, as long as it can apply pressure to the constraint rod 141 to prevent the fixed block 11 from moving.

[0059] Optionally, a connecting cover plate 16 is fixed on the fourth side of the fixing block 11, and the connecting cover plate 16 is connected to the restraining rod 141. The connection cover plate 16 is added so that the connection between the restraining rod 141 and the fixing block 11 is 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 vehicle models, while the shape and size of the connecting cover plate 16 can be adjusted arbitrarily, such as Figure 1As shown, in this embodiment, the connecting cover plate 16 is a rectangular parallelepiped as a whole, and the cross-sectional shape is almost the same as the top surface of the fixing block 11. The connecting cover plate 16 is connected to the top surface of the fixing block 11 by bolts, and is also connected to the U-shaped block 142 connected to the constraint rod 141 by bolts. According to actual application conditions, the shape and size of the connecting cover plate 16 can be adjusted according to the installation requirements of the constraint rod 141.

[0061] Optionally, two opposite ends of the rotating tube 22 in the extension direction are respectively fixedly connected with a rotating shaft 25, the rotating shaft 25 penetrates the lateral fixing plate 21, and is rotatably connected to the lateral fixing plate 21; one end of the rotating shaft 25 exposed from the lateral fixing plate 21 is sleeved with a stopper 26. The stopper 26 can be used to constrain the position of the rotating tube 22. If the rotating tube 22 is axially offset during rotation, the stopper 26 abuts against the lateral fixing plate 21 to prevent the rotating shaft 25 and the rotating tube 22 from being separated from the lateral fixing plate 21.

[0062] like Figure 1 and Figure 2 As shown, in this embodiment, the central positions of both ends of the rotating tube 22 are respectively fixed with the rotating shaft 25, and are rotatably connected to the lateral fixing plate 21 on the same side by means of bearings. The end of the rotating shaft 25 passing through the lateral fixing plate 21 is connected to the stopper 26. In this embodiment, the stopper 26 is a nut, which is sleeved with the rotating shaft 25 and is threadedly connected to the end of the rotating shaft 25. According to actual application conditions, the stopper 26 can be other structural parts, as long as it can limit the axial movement of the rotating shaft 25 and the rotating tube 22 after being connected with the rotating shaft 25.

[0063] Optionally, two sets of bushing fixing assemblies 23 are fixed on 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 makes the installation positions of the front frame bushing 32 and the rear frame bushing 33 of the front control arm assembly 3 and the bushing fixing assemblies 23 more flexible.

[0064] like Figure 1 and Figure 2 As shown, in the present embodiment, the left and right sides of the rotating tube 22 are symmetrically connected with 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, respectively. For various bushing hard points or bushing interface types, it is only necessary to replace the corresponding specific connection positions of the front bushing fixing seat 231 and the rear bushing fixing seat 232 and the rotating tube 22.

[0065] Optionally, a plurality of rotating loading blocks 24 are fixed at intervals on the outer wall of the rotating tube 22. This arrangement makes the connection position of the rotating actuator and the rotating tube 22 more flexible, and is also convenient for selecting a suitable connection position to prevent interference with other components during the action process.

[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, and 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, and the rotary actuator can be connected to the rotary loading block 24 on the upper side of the rotating tube 22 to realize the horizontal arrangement of the rotary actuator, and push the rotary loading block 24 horizontally to realize the rotation of 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 to realize the vertical arrangement of the rotary actuator, and push the rotary loading block 24 vertically to realize the rotation of the rotating tube 22. According to actual application conditions, the number of rotary loading blocks 24 and the specific arrangement positions on the outer wall of the rotating tube 22 can be adjusted.

[0067] The present invention further provides a method for endurance testing of a front control arm assembly of a McPherson suspension, based on a system for endurance testing of a front control arm assembly of a McPherson suspension as described in any of the above embodiments, comprising 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 in 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 acquired, and the actions of the longitudinal actuator, the lateral actuator and the rotary actuator are respectively controlled according to each 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 load change of the ball head of the front control arm assembly 3 in the X-axis and Y-axis directions over time, and the swing angle change 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 under actual use conditions, and to cause the front control arm assembly 3 to swing at an angle that is consistent with the actual vehicle under actual use conditions.

[0073] By adopting the durability test method of 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 direction and the Y direction are controlled, and 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 in the actual vehicle road can be truly reflected, and the durability performance of the front control arm assembly 3 under the actual use condition can be objectively reflected.

[0074] Optionally, before the step of acquiring the output power data of the longitudinal actuator, the lateral actuator and the rotary actuator, the following steps are also included:

[0075] 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 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 X-axis iterative time-domain force signal, the Y-axis iterative time-domain force signal and the iterative time-domain swing angle signal are obtained. According to the X-axis iterative time-domain force signal, the Y-axis iterative 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. According to the output power data obtained by the iterative signal conversion, the load applied to the ball head of the front control arm assembly 3 in the X direction by the longitudinal actuator, the load applied to the ball head of the front control arm assembly 3 in the Y direction by the lateral actuator, and the swing angle applied to the front frame bushing 32 and the rear frame bushing 33 by the rotary actuator are all closer to the situation when the actual vehicle is driving on the actual road, that is, the test results are 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: It includes ball head loading restraint fixture, rotating 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 which is connected to a second side surface of the fixing block, and the second side surface is arranged 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 constraint component, the constraint component being connected to the fourth side surface of the fixed block to constrain the movement of the fixed block; The rotary tooling comprises: Two lateral fixing plates, the two lateral fixing plates are arranged opposite to each other; A rotating tube, wherein two 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 comprises 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, the output end of which is connected to the rotary loading block; The output end of the controller is communicatively connected with 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 bottom plate, wherein the two stand columns are respectively fixedly connected to the fixed bottom 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, a first end of which is connected to the fixing block via a ball joint; A load-bearing member is connected to the second end of the restraining rod to apply 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 extending direction are respectively fixedly connected with rotating shafts, and the rotating shafts penetrate the lateral fixing plate and are rotatably connected to the lateral fixing plate; A limiting member is sleeved on one end of the rotating shaft 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 components are fixed on the outer wall of the rotating tube, and the two groups of the bushing fixing components 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 at intervals in the circumferential direction on the outer wall of the rotating tube.

9. A method for testing the durability of a front control arm assembly of a McPherson suspension, 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: Acquire 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 acquired, and the actions of the longitudinal actuator, the lateral actuator and the rotary actuator are respectively controlled according to each 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 following steps are also included: 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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