Rapid fatigue test method and test system for stay bar bracket

Abstract

The invention discloses a rapid fatigue test method and test system for a stay bar support, and the method comprises the steps: fixing the stay bar support to two installation blocks of a rack through installation screws, enabling the axis of a ball head of the stay bar support to extend in a first direction, and tightening the installation screws according to the standard torque M0 of the installation screws when the installation screws are fastened; a driving rod is connected to a ball head of the supporting rod support, and the driving rod is arranged in the second direction perpendicular to the first direction; the driving mechanism is started for loading, the force is unloaded to 0 after being loaded to a first threshold value F1, and one-time circulation is completed; circularly executing the step 3, wherein the number of cycles is N1; and evaluating the fatigue performance of the stay bar bracket. The fatigue test method has the advantages that the mounting angle of the stay bar bracket on the whole vehicle can be simulated, so that the fatigue test method is accurate and reliable in detection result and higher in safety coefficient; and cyclic loading fatigue verification can be rapidly carried out, so that the quality of parts can meet the requirements of the whole vehicle, the test cost and cost are saved, and cost reduction and benefit improvement are realized.

Description

Technical Field

[0001] The invention relates to the technical field of automobile front and rear covers, and in particular to a rapid fatigue test method and a test system for a strut bracket. Background Art

[0002] As consumers' demands for automobile space and comfort increase, vehicle sizes are getting larger and larger, and the sizes of the front and rear covers of cars are also increasing accordingly. The force parameters of electric or gas struts need to be adjusted and matched, and the supporting brackets of the struts also need to be matched accordingly. Sometimes automobile manufacturers will also try cost-cutting solutions to improve the thickness and material of the strut bracket, or improve the surface protection or model of the mounting screws of the strut bracket. When the design of the strut bracket is changed, its performance also needs to be verified. At present, the performance verification of the strut bracket generally uses the whole vehicle to open and close the cover for fatigue durability verification; the verification cycle is about 8 weeks, and the test costs about 400,000 yuan, which is a long cycle and high cost. Summary of the invention

[0003] In order to solve at least one of the above technical problems, the present invention provides a rapid fatigue test method and test system for a strut bracket, wherein the strut bracket is fixed on a test bench according to the installation angle of the whole vehicle through a mounting block for fatigue testing to simulate the force state of the support rod on the strut bracket in the whole vehicle state.

[0004] The present invention solves the technical problem by adopting the following technical solution:

[0005] A rapid fatigue test method for a brace support, the method comprising the following steps:

[0006] Step 1: Use mounting screws to fix the support rod bracket to the two mounting blocks of the stand, and make the axis of the ball head of the support rod bracket extend along the first direction. When tightening the mounting screws, tighten the mounting screws according to the standard torque M0 of the mounting screws;

[0007] Step 2, connecting the driving rod to the ball head of the support rod bracket, and arranging the driving rod along a second direction, wherein the second direction is perpendicular to the first direction;

[0008] Step 3, start the driving mechanism to load, load the force to the first threshold F1 and then unload to 0, completing one cycle, the first threshold F1 is set to one of 1500-2000N;

[0009] Step 4, looping step 3, the number of loops is N1 times, and the number of loops N1 is set to one of 30000-40000 times;

[0010] Step 5: Evaluate the fatigue performance of the strut support.

[0011] Furthermore, the method also includes after the force is loaded to the first threshold value F1, maintaining the first threshold value F1 for a time t and then unloading, and the time t is set to one of 1-4s, so as to improve the safety factor of the fatigue test of the strut support.

[0012] Further, the time t is set to one of 2-3s.

[0013] Furthermore, the method for evaluating the fatigue performance of the strut support includes:

[0014] After the fatigue test, loosen the mounting screws and measure the maximum torque M1 of the mounting screws during the loosening process;

[0015] The maximum torque M1 of the mounting screw after the fatigue test is compared with the standard torque M0 of the mounting screw; if the torque loss rate of the mounting screw does not exceed the torque loss rate threshold X0, the fatigue performance of the mounting screw is determined to be qualified; the torque loss rate threshold X0 is set to 20%-40%.

[0016] Furthermore, the torque loss rate threshold X0 is set to 20%-30%.

[0017] Furthermore, the method for evaluating the fatigue performance of the strut support also includes:

[0018] Before step 1, the ball head of the strut bracket is optically scanned, and after the fatigue test, the ball head of the strut bracket is optically scanned again. If the deformation of the ball head after the fatigue test is not greater than the deformation threshold L, the fatigue performance of the ball head is determined to be qualified; the deformation threshold L is set to 1-2mm; preferably, the deformation threshold L is set to 1-1.5mm.

[0019] Further, the first threshold F1 is set to one of 1800-2000N, and the number of cycles N1 is set to one of 30000-35000 times.

[0020] Furthermore, a rapid fatigue test system for a strut support is applied to the test method described above, and the test system includes a stand and a drive mechanism; wherein:

[0021] The stand comprises a base and a mounting block arranged on the base, the mounting block comprises two, the top surfaces of the two mounting blocks are coplanar or parallel, the angle α between the plane where the top surface of each mounting block is located and the first direction is equal to the angle α′ between the axis of the ball head of the strut bracket and the mounting surface; the top surface of each mounting block is provided with a first threaded hole adapted to the mounting screw of the strut bracket, the axis of the first threaded hole is perpendicularly arranged on the top surface of the mounting block; the distance S between the axes of the first threaded holes of the two mounting blocks is equal to the distance S′ between the axes of the two mounting holes of the strut bracket;

[0022] The driving mechanism comprises a driving rod, and a free end of the driving rod is provided with a first ball socket matched with a ball head of the support rod bracket.

[0023] Furthermore, the angle β between the straight line where the driving rod is located and the straight line where the center points of the first threaded holes on the top surfaces of the two mounting blocks are located is equal to the angle β′ between the straight line where the support rod is located and the straight line where the center points of the two mounting holes of the strut bracket on the corresponding mounting surfaces are located in the complete vehicle state, so that the force direction of the driving rod on the ball head is consistent with the force direction of the support rod on the ball head in the complete vehicle state.

[0024] Furthermore, the mounting block is configured to be T-shaped, including a fixing portion and a supporting portion, the fixing portion is configured at one end of the supporting portion, the top surface of the supporting portion is configured as an inclined surface, and the inclined surface has an angle α with the first direction; through holes are respectively provided at both ends of the fixing portion, and the base is provided with second threaded holes adapted to each through hole, so as to facilitate fixing the mounting block to the base.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] (1) The test bench of the test system can simulate the installation angle of the strut bracket on the whole vehicle. The driving rod and the test bench can simulate the force exerted by the support rod on the strut bracket in the whole vehicle state, so that the test results of the fatigue test method are accurate.

[0027] (2) When the strut bracket is fatigue loaded using the rapid fatigue test method, the cyclic loading condition is worse than the loading condition of the whole vehicle fatigue test, and the fatigue verification of the strut bracket is more reliable and has a higher safety factor, making the strut bracket that is fatigue verified using this test method safer.

[0028] (3) This test method can quickly perform cyclic loading fatigue verification, which not only ensures that the quality of parts meets the requirements of the whole vehicle, but also saves test fees and costs. The test resources are changed from the whole vehicle to the test bench, saving one whole vehicle; the test space is reduced from 15㎡ to 5㎡; the test cycle is shortened from 8 weeks to 2 weeks; the cost is expected to be reduced from 400,000 yuan to 20,000 yuan, achieving cost reduction and efficiency improvement. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to better understand the above and other purposes, features, advantages and functions of the present invention, reference may be made to the embodiments shown in the accompanying drawings. The same reference numerals in the accompanying drawings refer to the same components. It should be understood by those skilled in the art that the accompanying drawings are intended to schematically illustrate the preferred embodiments of the present invention and have no limiting effect on the scope of the present invention, and the components in the drawings are not drawn to scale.

[0030] Figure 1 It is a structural schematic diagram of a rapid fatigue testing system of a support rod support of the present invention.

[0031] Figure 2 This is a schematic diagram of the enlarged structure of A.

[0032] Figure 3 It is a top view of the enlarged structural schematic diagram of A.

[0033] In the figure: 1-stand; 11-base; 111-bolt; 12-mounting block; 121-fixing part; 122-supporting part; 2-driving mechanism; 21-driving rod; 3-support rod bracket; 31-mounting screw; 32-ball head; 4-base. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the exemplary embodiments of the present invention are described below in conjunction with the accompanying drawings, including various details of the embodiments of the present invention to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present disclosure. Similarly, for the sake of clarity and conciseness, the description of well-known functions and structures is omitted in the following description.

[0035] In the description of the present invention, it should be noted that the term "including" and its variations represent open inclusion, that is, "including but not limited to". The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0036] The present invention provides a rapid fatigue test method for a strut support 3, the method comprising the following steps:

[0037] Step 1: Use the mounting screws 31 to fix the support rod bracket 3 to the two mounting blocks 12 of the stand 1, and make the axis of the ball head 32 of the support rod bracket 3 extend along the first direction. When tightening the mounting screws 31, tighten the mounting screws 31 according to the standard torque M0 of the mounting screws 31;

[0038] Step 2, connecting the driving rod 21 to the ball head 32 of the support rod bracket 3, and arranging the driving rod 21 along a second direction, wherein the second direction is perpendicular to the first direction;

[0039] Step 3, start the driving mechanism 2 to load, and unload the force to 0 after loading to the first threshold F1, completing one cycle, and the first threshold F1 is set to one of 1500-2000N;

[0040] Step 4, looping step 3, the number of loops is N1 times, and the number of loops N1 is set to one of 30000-40000 times;

[0041] Step 5: Evaluate the fatigue performance of the strut support 3.

[0042] In step 1, when tightening the mounting screw 31, the mounting screw 31 is tightened according to the standard torque M0 of the mounting screw 31, which can simulate the tightening state of the strut bracket 3 installed on the vehicle in the whole vehicle state. The standard torque M0 of the mounting screw 31 can be obtained from the drawing of the strut bracket 3 or the installation process requirements.

[0043] In step 2, the driving rod 21 is arranged along the second direction so that the driving rod 21 is perpendicular to the axis of the ball head 32, and a force perpendicular to the axis of the ball head 32 can be applied to the ball head 32, and the force applied to the ball head 32 is greater under the same load. When the rear cover is closed, the force applied by the support rod to the ball head 32 is the largest. If the force applied by the support rod is perpendicular to the axis of the ball head 32 at this time, step 2 can simulate the force applied by the support rod to the ball head 32 in the state of the whole vehicle; if the force applied by the support rod is not perpendicular to the axis of the ball head 32 at this time, the force applied by the driving rod 21 to the ball head 32 in step 2 is greater than the force applied by the support rod to the ball head 32 in the state of the whole vehicle, which can improve the safety factor of the fatigue test. The driving rod 21 is perpendicular to the axis of the ball head 32, and can be applied to various different force applied by the support rod to the ball head 32, making the test method universal and reliable.

[0044] In step 3, the first threshold F1 can be obtained by taking the safety factor according to the performance parameters given in the drawing of the strut support 3 to improve the reliability of the fatigue test. The performance parameters given in the drawing of the strut support 3 are generally 900-1200N, and the first threshold F1 can be set to one of 1500-2000N. Preferably, the first threshold F1 can be set to one of 1800-2000N. For example, the first threshold F1 can be set to 1500N, 1600N, 1700N, 1800N, 1900N, 2000N, etc.

[0045] In step 4, the number of cycles N1 can be obtained by taking the safety factor according to the number of cycles of the whole vehicle fatigue test of the strut bracket 3, so that the number of cycles of the fatigue test loading is more than the number of cycles of the whole vehicle fatigue test, and the reliability of the fatigue test is further improved. The number of cycles of the whole vehicle fatigue test of the strut bracket 3 is generally 20,000-28,000 times, and the number of cycles N1 of the fatigue test can be set to one of 30,000-40,000 times. Preferably, the number of cycles N1 can be set to one of 30,000-35,000 times. For example, the number of cycles N1 can be set to 30,000 times, 31,000 times, 32,000 times, 33,000 times, 34,000 times, 35,000 times, 36,000 times, 37,000 times, 38,000 times, 39,000 times, 40,000 times, etc.

[0046] The driving mechanism 2 can use a fatigue testing machine to fatigue load the ball head 32. Depending on the type of the fatigue testing machine, the first direction can be set to be a vertical direction or a horizontal direction. For example, when the fatigue testing machine is vertical, the driving rod 21 is arranged in the vertical direction, the first direction is a horizontal direction, and the second direction is a vertical direction; when the fatigue testing machine is horizontal, the driving rod 21 is arranged in the horizontal direction, the first direction is a vertical direction, and the second direction is a horizontal direction. Preferably, in order to more conveniently fix the stand 1, it is better to arrange the driving rod 21 in the horizontal direction.

[0047] In one embodiment, the method further includes, after the force is loaded to the first threshold value F1, maintaining the first threshold value F1 for a time t before unloading, the time t can be set to one of 1-4s, preferably, the time t can be set to one of 2-3s, for example, the time t can be set to 1s, 1.5s, 2s, 2.5s, 3s, 3.5s, 4s, etc. The first threshold value F1 is the maximum load applied by the drive mechanism 2 to the strut support 3 in each loading cycle, the load of the drive mechanism 2 is loaded to the first threshold value F1, maintained for 1-4s before unloading, so that the time for the drive mechanism 2 to apply the maximum load to the strut support 3 in each loading cycle is longer, thereby improving the safety factor of the fatigue test of the strut support 3.

[0048] Compared with the whole vehicle fatigue test, the use of the rapid fatigue test method to fatigue load the strut bracket 3, the drive mechanism 2 applies a larger load to the ball head 32, the number of cycles is more, and the loading time of a single cycle is shorter, so that the ball head 32 is subjected to a greater impact and the safety factor is higher, which can improve the reliability of the test and make the strut bracket 3 that is fatigue-verified by the rapid fatigue test method safer; it can also greatly shorten the test time, save test fees and costs, and the test cycle is shortened from 8 weeks to 2 weeks; the cost is expected to be reduced from 400,000 yuan to 20,000 yuan, achieving cost reduction and efficiency improvement.

[0049] In one embodiment, the method for evaluating the fatigue performance of the strut support 3 includes:

[0050] After the fatigue test, the mounting screw 31 is loosened, and the maximum torque M1 of the mounting screw 31 during the loosening process is measured;

[0051] The maximum torque M1 of the mounting screw 31 after the fatigue test is compared with the standard torque M0 of the mounting screw 31; if the torque loss rate of the mounting screw 31 does not exceed the torque loss rate threshold X0, the fatigue performance of the mounting screw 31 is determined to be qualified; otherwise, the fatigue performance of the mounting screw 31 is determined to be unqualified.

[0052] When the strut bracket 3 is installed on the mounting block 12 of the gantry 1, the torque for tightening the mounting screw 31 is the standard torque M0. After the fatigue test, the maximum torque for loosening the mounting screw 31 is M1. During the fatigue cycle loading process, the driving rod 21 pushes and pulls the strut bracket 3 back and forth through the ball head 32, causing the mounting screw 31 to loosen and the torque of the mounting screw 31 to be lost. The torque loss rate X0 is:

[0053] .

[0054] Preferably, the torque loss rate threshold X0 is set to 20%-40%, for example, the torque loss rate threshold X0 can be set to 20%, 25%, 30%, 35%, 40%, etc. More preferably, the torque loss rate threshold X0 is set to 20%-30%, improving the evaluation standard, thereby improving the firmness of the mounting screw 31 fastening the strut bracket 3.

[0055] The driving rod 21 applies force to the strut bracket 3 through the ball head 32. The ball head 32 may be deformed during the process of pushing and pulling the ball head 32. The method for evaluating the fatigue performance of the strut bracket 3 also includes:

[0056] Before step 1, the ball head 32 of the strut bracket 3 is optically scanned, and after the fatigue test, the ball head 32 of the strut bracket 3 is optically scanned again, and the deformation of the ball head 32 before and after the fatigue test is compared. If the deformation of the ball head 32 after the fatigue test is not greater than the deformation threshold L, the fatigue performance of the ball head 32 is determined to be qualified; otherwise, the deformation of the ball head 32 is too large, and the fatigue performance of the strut bracket 3 is unqualified. The deformation threshold L is set to 1-2mm; preferably, the deformation threshold L is set to 1-1.5mm, for example, the deformation threshold L can be set to 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, etc. Of course, after the fatigue test, the strut bracket 3 is cracked or damaged, and its fatigue performance is unqualified.

[0057] The present invention also provides a rapid fatigue test system for a support rod support 3, which is applied to the test method described above, referring to Figure 1 and Figure 2 As shown, the test system includes a test bench 1 and a driving mechanism 2. The test bench 1 includes a base 11 and a mounting block 12 disposed on the base 11. The base 11 can be fixed to the ground or the base 4 and remains stationary during the loading process.

[0058] The mounting blocks 12 include two, the top surfaces of the two mounting blocks 12 are coplanar or parallel, and the angle α between the plane where the top surface of each mounting block 12 is located and the first direction is equal to the angle α′ between the axis of the ball head 32 of the strut bracket 3 and the mounting surface. The top surfaces of the two mounting blocks 12 can be set according to the relative positions of the two mounting surfaces of the strut bracket 3. When the two mounting surfaces of the strut bracket 3 are coplanar, the mounting surfaces of the two mounting blocks 12 are coplanar; when the two mounting surfaces of the strut bracket 3 are parallel, the top surfaces of the two mounting blocks 12 are parallel. In this way, the two mounting surfaces of the strut bracket 3 can be flatly attached to the top surfaces of the two mounting blocks 12 respectively. The axis of the ball head 32 of the strut bracket 3 has an angle α′ with the mounting surface. During the test, the strut bracket 3 is mounted on the mounting block 12. When the axis of the ball head 32 extends along the first direction, the two mounting surfaces of the strut bracket 3 need to be flatly fitted to the top surfaces of the two mounting blocks 12, respectively. Therefore, the plane where the top surface of the mounting block 12 is located needs to have an angle α with the first direction. The angle α between the plane where the top surface of each mounting block 12 is located and the first direction is equal to the angle α′ between the axis of the ball head 32 of the strut bracket 3 and the mounting surface. The top surface of each mounting block 12 is provided with a first threaded hole that is compatible with the mounting screw 31 of the strut bracket 3. The axis of the first threaded hole is perpendicular to the top surface of the mounting block 12. The distance S between the axes of the first threaded holes of the two mounting blocks 12 is equal to the distance S′ between the axes of the two mounting holes of the strut bracket 3. The two mounting screws 31 can pass through the mounting surface and be tightened perpendicularly to the top surface of the mounting block 12, so that the tightening state of the mounting screws 31 is consistent with the state of the whole vehicle. When the strut bracket 3 is mounted on the top surface of the mounting block 12 by means of the mounting screws 31 , the state of the strut bracket 3 in the state of the whole vehicle can be simulated, and it is convenient for the driving rod 21 to apply force to the ball head 32 .

[0059] The ball head 32 of the strut bracket 3 is fixedly arranged on the bracket body, and in the complete vehicle state, the support rod is connected to the ball head 32 through the second ball socket. The driving mechanism 2 of the fatigue test system includes a driving rod 21, and the free end of the driving rod 21 is provided with a first ball socket adapted to the ball head 32 of the strut bracket 3, so that the contact state between the first ball socket and the ball head 32 is consistent with the contact state between the second ball socket and the ball head 32 of the support rod in the complete vehicle state, so that the force application state of the driving rod 21 on the ball head 32 is consistent with the force application state of the support rod on the ball head 32 in the complete vehicle state. When the first ball socket of the driving rod 21 is connected to the ball head 32 of the strut bracket 3 and a force is applied to the ball head 32, it can simulate the support rod in the complete vehicle state being connected to the strut bracket 3 and applying a force to the strut bracket 3.

[0060] In one embodiment, Figure 3As shown, the angle β between the straight line where the driving rod 21 is located and the straight line where the center points of the first threaded holes on the top surfaces of the two mounting blocks 12 are located is equal to the angle β′ between the straight line where the support rod is located and the straight line where the center points of the two mounting holes of the strut bracket 3 on the corresponding mounting surfaces are located in the whole vehicle state, so that the force direction of the driving rod 21 on the ball head 32 is consistent with the force direction of the support rod on the ball head 32 in the whole vehicle state, thereby making the stress state of the mounting screw 31 of the strut bracket 3 consistent with the stress state of the mounting screw 31 in the whole vehicle state, and the detection of the fatigue performance of the mounting screw 31 is more accurate and reliable.

[0061] In one embodiment, Figure 2 As shown, the mounting block 12 is set in a T-shape, including a fixing portion 121 and a supporting portion 122. The fixing portion 121 is set at one end of the supporting portion 122. The top surface of the supporting portion 122 is set as an inclined surface. The inclined surface has an angle α with the first direction. The top surface of the supporting portion 122 is the top surface of the mounting block 12. The mounting surface of the strut bracket 3 can be flatly fitted and fixed to the top surface of the supporting portion 122, and the axis of the ball head 32 extends along the first direction. Through holes are respectively set at both ends of the fixing portion 121, and the base 11 is provided with second threaded holes adapted to each through hole. The mounting block 12 can be conveniently fixed to the base 11 by bolts 111. Specifically, the angle α′ between the axis of the ball head 32 of the strut bracket 3 and the mounting surface and the distance S′ between the axes of the two mounting holes of the strut bracket 3 can be measured based on the 3D data of the strut bracket 3, and an inclined surface can be made based on the angle α′. The height difference between the two mounting blocks 12 can be determined based on the relative positions of the top surfaces of the two mounting blocks 12 and the distance S between the axes of the first threaded holes of the two mounting blocks 12, thereby manufacturing the corresponding mounting blocks 12.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A rapid fatigue test method for a strut support, characterized in that: The method comprises the following steps: Step 1: Use mounting screws to fix the support rod bracket to the two mounting blocks of the stand, and make the axis of the ball head of the support rod bracket extend along the first direction. When tightening the mounting screws, tighten the mounting screws according to the standard torque M0 of the mounting screws; Step 2, connecting the driving rod to the ball head of the support rod bracket, and arranging the driving rod along a second direction, wherein the second direction is perpendicular to the first direction; Step 3, start the driving mechanism to load, load the force to the first threshold F1 and then unload to 0, completing one cycle, the first threshold F1 is set to one of 1500-2000N; Step 4, looping step 3, the number of loops is N1 times, and the number of loops N1 is set to one of 30000-40000 times; Step 5: Evaluate the fatigue performance of the strut support.

2. The rapid fatigue test method of the strut support according to claim 1, characterized in that: The method further includes, after the force is loaded to a first threshold value F1, maintaining the first threshold value F1 for a time t and then unloading, wherein the time t is set to one of 1-4s.

3. The rapid fatigue test method of the strut support according to claim 2, characterized in that: The time t is set to one of 2-3s.

4. The rapid fatigue test method of the strut support according to claim 1, characterized in that: Methods for evaluating the fatigue performance of strut supports include: After the fatigue test, loosen the mounting screws and measure the maximum torque M1 of the mounting screws during the loosening process; The maximum torque M1 of the mounting screw after the fatigue test is compared with the standard torque M0 of the mounting screw; if the torque loss rate of the mounting screw does not exceed the torque loss rate threshold X0, the fatigue performance of the mounting screw is determined to be qualified; the torque loss rate threshold X0 is set to 20%-40%.

5. The rapid fatigue test method of the strut support according to claim 4, characterized in that: The torque loss rate threshold X0 is set to 20%-30%.

6. The rapid fatigue test method of the strut support according to claim 1, characterized in that: Methods for evaluating the fatigue performance of the strut support also include: Before step 1, the ball head of the strut bracket is optically scanned, and after the fatigue test, the ball head of the strut bracket is optically scanned again. If the deformation of the ball head after the fatigue test is not greater than the deformation threshold L, the fatigue performance of the ball head is determined to be qualified; the deformation threshold L is set to 1-2mm; preferably, the deformation threshold L is set to 1-1.5mm.

7. The rapid fatigue test method of the strut support according to claim 1, characterized in that: The first threshold F1 is set to one of 1800-2000N, and the number of cycles N1 is set to one of 30000-35000 times.

8. A rapid fatigue test system for a strut support, applied to the test method according to any one of claims 1 to 7, characterized in that: The test system comprises a test bench and a driving mechanism; wherein, The stand comprises a base and a mounting block arranged on the base, the mounting block comprises two, the top surfaces of the two mounting blocks are coplanar or parallel; the angle α between the plane where the top surface of each mounting block is located and the first direction is equal to the angle α′ between the axis of the ball head of the strut bracket and the mounting surface; the top surface of each mounting block is provided with a first threaded hole adapted to the mounting screw of the strut bracket, the axis of the first threaded hole is perpendicularly arranged on the top surface of the mounting block; the distance S between the axes of the first threaded holes of the two mounting blocks is equal to the distance S′ between the axes of the two mounting holes of the strut bracket; The driving mechanism comprises a driving rod, and a free end of the driving rod is provided with a first ball socket matched with a ball head of the support rod bracket.

9. The rapid fatigue test system of the strut support according to claim 8, characterized in that: The angle β between the straight line where the driving rod is located and the straight line where the center points of the first threaded holes on the top surfaces of the two mounting blocks are located is equal to the angle β′ between the straight line where the support rod is located and the straight line where the center points of the two mounting holes of the support rod bracket on the corresponding mounting surfaces are located in the complete vehicle state.

10. The rapid fatigue test system of the strut support according to claim 8, characterized in that: The mounting block is configured to be T-shaped, including a fixing portion and a supporting portion, the fixing portion is configured at one end of the supporting portion, the top surface of the supporting portion is configured to be an inclined surface, and the inclined surface has an angle α with the first direction; through holes are respectively provided at both ends of the fixing portion, and the base is provided with second threaded holes that are compatible with each through hole.

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