Auxiliary frame motor suspension mounting point test equipment and loading method thereof

Abstract

The invention discloses auxiliary frame motor suspension mounting point test equipment and a loading method thereof, and relates to the field of test stands. The auxiliary frame motor suspension mounting point test equipment comprises a height-adjustable base used for supporting and fixing an auxiliary frame; the portal frame is arranged above the auxiliary frame in a striding mode, and a hydraulic cylinder capable of adjusting the position in the length direction of the portal frame is arranged on a cross beam of the portal frame; the load sensor is connected to a piston rod end of the hydraulic cylinder; the universal device is used for being mounted to a front motor suspension mounting point or a rear motor suspension mounting point of the auxiliary frame; the first connecting rod, the linear bearing and the second connecting rod are sequentially connected between the universal device and the load sensor, and the universal device and the linear bearing jointly form a two-force rod structure. The auxiliary frame motor suspension mounting point strength and fatigue test device can be universally used for auxiliary frames of different shapes, and the strength and fatigue test of auxiliary frame motor suspension mounting points is standardized.

Description

Technical Field

[0001] This invention relates to the field of test bench technology, specifically to a test device for the motor suspension mounting point of a subframe and its loading method. Background Technology

[0002] In a car, the chassis bears the vehicle's weight, ensuring stability and safety, while the subframe is a crucial pillar of this system. It's not only an extension of the chassis structure but also a key factor in vehicle performance and durability. As a core component of the chassis system, the subframe is located primarily beneath the main frame, acting like the vehicle's skeleton, providing a solid foundation for the suspension system, drivetrain, and other critical components. Through careful design and material selection, the subframe ensures precise vehicle handling and ride comfort.

[0003] As a key component of the automotive chassis, the subframe's fatigue and strength verification is crucial. Currently, electric vehicles are developing rapidly and have a broad future. The motor assembly is connected to the motor mount points on the subframe via corresponding fasteners. Based on actual stress conditions, OEMs have set testing requirements for the subframe motor mount points. These requirements stipulate that the front mount points (front mount points in phase) and rear mount points (rear mount points in phase) on the subframe must undergo cyclic fatigue verification and single-cycle strength verification with a 180° phase difference in the vehicle's vertical direction. Because different subframes have different dimensions and motor mount point locations, each test requires a corresponding test fixture designed for each subframe. Currently, there is no standardized testing equipment compatible with motor mount points on different subframes.

[0004] Therefore, in view of the problems existing in the prior art, the designer of this case, based on years of experience in this industry, actively researched and improved the technology, and thus the present invention was developed as a test device and loading method for a subframe motor suspension mounting point. Summary of the Invention

[0005] In view of this, the present invention aims to provide a test device and loading method for the subframe motor mounting point, which can be used for subframes of different shapes and standardize the strength and fatigue tests of the subframe motor mounting point.

[0006] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0007] A subframe motor mounting point testing device includes a height-adjustable base for supporting and fixing the subframe; a gantry spanning above the subframe, with a hydraulic cylinder on the crossbeam of the gantry that can be adjusted in position along its length; a load sensor connected to the piston rod end of the hydraulic cylinder; a universal joint for mounting to the front or rear motor mounting point of the subframe; and a first connecting rod, a slotted bearing, and a second connecting rod sequentially connected between the universal joint and the load sensor, wherein the universal joint and the slotted bearing together constitute a two-force bar structure.

[0008] In some embodiments, the height-adjustable base includes a base, a cylinder disposed on the base, and a fixing seat disposed inside the cylinder. The cylinder wall is provided with multiple elongated holes, and a first fastener passes through the elongated holes to fix the fixing seat at different height positions inside the cylinder.

[0009] In some embodiments, the universal joint includes a bearing housing, a fisheye bearing mounted in the bearing housing, and a central shaft passing through the fisheye bearing, the center of which coincides with the center of the front motor mounting point or the rear motor mounting point.

[0010] In some embodiments, the columns of the gantry frame are provided with vertical grooves, and the fourth connecting plate of the crossbeam is provided with protrusions that fit with the grooves.

[0011] In some embodiments, the hydraulic cylinder is connected to the crossbeam via a fifth connecting plate. The fifth connecting plate has a fourth step on both sides. A limit plate is provided on the crossbeam. The fourth step and the limit plate are fitted with a clearance. The sixth connecting plate (100) is connected to the fifth connecting plate via a thirteenth fastener (101) to clamp and fix the hydraulic cylinder on the limit plate.

[0012] In some embodiments, the width at both ends of the central shaft is consistent with the width of the bolt mounting holes at the front motor mounting point or the rear motor mounting point.

[0013] A loading method for the subframe motor mounting point test equipment described above includes the following steps:

[0014] S1: Adjust the height-adjustable base to a suitable height according to the shape of the subframe;

[0015] S2: Secure the subframe to the height-adjustable base;

[0016] S3: Adjust the subframe and height-adjustable base to be parallel to the groove line of the test platform and fix them;

[0017] S4: Move the gantry frame equipped with hydraulic cylinders to the vicinity of the mounting point of the subframe and initially fix it;

[0018] S5: Connect the load sensor of the hydraulic cylinder to the universal joint installed at the mounting point in sequence through the second connecting rod, the slotted bearing, and the first connecting rod;

[0019] S6: Adjust the position of the gantry and hydraulic cylinder until the first connecting rod is perpendicular to the test platform, and then fix the gantry and hydraulic cylinder;

[0020] S7: The hydraulic cylinders at the motor mounting points before and after the connection are controlled to perform a loading test with a 180° phase difference. Attached Figure Description

[0021] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0022] Figure 1 This is a schematic diagram of the overall structure of a test device for a subframe motor mounting point according to the present invention.

[0023] Figure 2 This is an overall schematic diagram of the height-adjustable base of the present invention.

[0024] Figure 3 This is an exploded view of the height-adjustable base of the present invention.

[0025] Figure 4 This is a cross-sectional schematic diagram of the height-adjustable base of the present invention.

[0026] Figure 5 This is a cross-sectional schematic diagram of the universal joint device of the present invention.

[0027] Figure 6 This is an exploded view of the column of the present invention.

[0028] Figure 7 This is a schematic diagram of the overall structure of the crossbeam of the present invention.

[0029] Figure 8 This is a schematic diagram of the fixing of the hydraulic cylinder of the present invention.

[0030] Explanation of reference numerals in the attached figures

[0031] 1. Height-adjustable base; 2. Lower step fixing block; 3. Upper step fixing block; 4. Subframe; 5. Universal joint; 6. First connecting rod; 7. Level; 8. Slotted bearing; 9. Nut; 10. Second connecting rod; 11. Load sensor; 12. Gantry frame; 13. Hydraulic cylinder; 14. Angle gauge; 15. Test platform; 16. Quick-release plate; 17. First bolt through hole; 18. Cylinder; 19. Reinforcing rib; 20. Long slot hole; 21. Arc washer; 22. First fastener; 23. Connecting seat; 24. First countersunk bolt through hole; 25. First threaded hole; 26. Adjusting bolt; 27. Middle first... Threaded hole, 28. Second threaded hole, 29. First pin hole, 30. Third bolt through hole, 31. Arc contact surface, 32. Pin, 33. Second pin hole, 34. Third pin hole, 35. Second fastener, 36. First stop, 37. Third fastener, 38. Center through hole, 39. Circular baffle, 40. First clearance, 41. First step, 42-Second step, 43. Fisheye bearing, 44. First circlip groove, 45. Hole circlip, 46. Fourth fastener, 47. Central shaft, 48. Second circlip groove, 49. Shaft circlip, 50. Third step, 51. Bearing seat, 52. Second countersunk thread 53. Bolt hole, 54. First connecting plate, 55. Fifth fastener, 56. Second connecting plate, 57. Third threaded hole, 58. Second clearance, 59. Sixth fastener, 60. First base plate, 61. Third countersunk bolt hole, 62. First elongated hole, 63. Fourth countersunk bolt hole, 64. Side plate, 65. First lifting hole, 66. Sixth countersunk bolt hole, 67. Fourth bolt through hole, 68. Slide groove, 69. Seventh fastener, 70. Vertical plate, 71. Third connecting plate, 72. Seventh countersunk bolt hole, 73. Eighth fastener, 74. Fourth connecting plate, 75. Eighth countersunk bolt hole, 76. Ninth fastener, 7 7. Fifth bolt through hole; 78. Protrusion; 79. Limiting plate; 80. Fourth threaded hole; 81. Front motor mounting point; 82. Rear motor mounting point; 83. Lifting lug; 84. Crossbeam; 85. Column; 86. Tenth fastener; 87. Eleventh fastener; 88. Base; 89. Second base plate; 90. Fixing seat; 91. Step hole; 92. Step boss; 93. Twelfth fastener; 94. Bushing replacement device; 95. Second stop block; 96. Fifth threaded hole; 97. Second lifting hole; 98. Fifth connecting plate; 99. Fourth step; 100. Sixth connecting plate; 101. Thirteenth fastener. Detailed Implementation

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0033] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] The following is for reference. Figures 1 to 8 The test equipment for the subframe motor suspension mounting point and its loading method according to embodiments of the present invention are described in conjunction with examples.

[0035] A subframe motor suspension mounting point testing device includes, during strength testing, adjusting the height-adjustable base 1 around the subframe 4 to fit the subframe 4, and then fixing the subframe 4 to the height-adjustable base 1. Angle ruler 14 is used to adjust the subframe 4 and the height-adjustable base 1 until they are parallel to the groove line of the test platform 15. Two hydraulic cylinders 13 are fixed to the crossbeam 84 above the gantry 12. The hydraulic cylinders 13 can be horizontally adjusted to a suitable position along the length of the crossbeam 84 and then fixed with a thirteenth fastener 101. A load sensor 11 is connected to the piston rod end of the hydraulic cylinder 13. The hydraulic cylinder 13 has a built-in position sensor. Through the load sensor 11 and the built-in position sensor of the hydraulic cylinder 13, the force and displacement curves of the corresponding test position of the subframe 4 can be observed in real time, and the time, force, and displacement data during the test can be stored through software. Universal joints 5 are installed at the front motor mount point 81 and the rear motor mount point 82 of the subframe 4, respectively. The universal joints 5 are connected to the load sensor 11 via a first connecting rod 6, a slotted bearing 8, and a second connecting rod 10. The universal joints 5 and the slotted bearing 8 together form a two-force bar structure, ensuring the free force state of the front motor mount point 81 and the rear motor mount point 82. If necessary, the load sensor 11 can be placed between the universal joints 5 and the slotted bearing 8. For fatigue testing, the lower step fixing block 2 and the upper step fixing block 3 are not required. The subframe 4 has its own original body bushing at this location, so the bushing replacement device 94 in the middle of the universal joints 5 is not needed. The test is conducted using the motor mount bushing that comes with the subframe 4.

[0036] The top of the reinforcing rib 19 is slightly smaller and is kept at an appropriate distance from the top of the cylinder 18 to prevent interference between the subframe 4 and the reinforcing rib 19. The upper end of the connecting seat 23 has multiple first threaded holes 25 to prevent interference between the subframe 4 and the height-adjustable base 1. Connecting blocks can be further added through these first threaded holes 25 to connect the subframe 4. The center of the fisheye bearing 43 coincides with either the front motor mounting point 81 or the rear motor mounting point 82.

[0037] The side plate 63 of the column 85 is provided with a sliding groove 68, and the fourth connecting plate 74 of the crossbeam 84 is provided with a protrusion 78. The sliding groove 68 and the protrusion 78 cooperate to make the height of the crossbeam 84 adjustable. The fifth connecting plate 98 connected to the hydraulic cylinder 13 is provided with a fourth step 99, which cooperates with the limiting plate 79 and the sixth connecting plate 100 on the crossbeam 84 to allow the hydraulic cylinder 13 to adjust its position along the limiting plate 79. The universal joint 5 and the slotted bearing 8 together form a two-force bar structure. If necessary, the load sensor 11 can be placed between the universal joint 5 and the slotted bearing 8. The center shaft 47 has a threaded through hole in the middle, so that a second fastener 35 and a fourth fastener 46 can be installed at each end of the center shaft 47 respectively.

[0038] The width of both ends of the central shaft 47 is the same as the width of the bolt mounting holes of the front motor mounting point 81 or the rear motor mounting point 82, so that the remaining parts of the universal joint 5 can be used in strength tests and fatigue tests.

[0039] like Figure 1The diagram shows an overall schematic of a subframe motor suspension mounting point testing device according to the present invention. During strength testing, the height-adjustable base 1 around the subframe 4 is adjusted to fit the subframe 4, and then the subframe 4 is fixed to the height-adjustable base 1 using the tenth fastener 86, the lower step fixing block 2, and the upper step fixing block 3. The subframe 4 and the height-adjustable base 1 are adjusted to be parallel to the groove line of the test platform 15 using an angle gauge 14, which facilitates the setup of the platform and ensures neatness. Then, the height-adjustable base 1 around the subframe 4 is fixed using a quick-release plate 16. Two uprights 85 and one crossbeam 84, fixed with the eleventh fastener 87, form a gantry frame 12. Two hydraulic cylinders 13 are fixed to the crossbeam 84 above the gantry frame 12. The hydraulic cylinders 13 can be horizontally adjusted to an appropriate position along the length of the crossbeam 84 and then fixed with the thirteenth fastener 101. A load sensor 11 is connected to the piston rod end of the hydraulic cylinder 13. The hydraulic cylinder 13 also has a built-in position sensor. Through the load sensor 11 and the built-in position sensor, the force and displacement curves of the test piece can be observed in real time, and the time, force, and displacement data during the test can be stored via software. Universal joints 5 are installed at the front motor mounting point 81 and the rear motor mounting point 82 of the subframe 4, respectively. The universal joints 5 are connected to a first connecting rod 6 via corresponding fasteners. The first connecting rod 6 is threaded to a slotted bearing 8. The other end of the slotted bearing 8 is threaded to a second connecting rod 10 and locked with a nut 9. The other end of the second connecting rod 10 is connected to the load sensor 11 via fasteners. The universal joints 5 and the slotted bearing 8 together form a two-force bar structure, ensuring the free force state of the front motor mounting point 81 and the rear motor mounting point 82. If necessary, the load sensor 11 can be placed between the universal joints 5 and the slotted bearing 8. A level 7 is placed at the first connecting rod 6. Loosen the quick-release plate 16 securing the gantry 12, loosen the thirteenth fastener 101 securing the hydraulic cylinder 13, and use an overhead crane to lift the lifting lug 83 on the hydraulic cylinder 13. If necessary, add a second lifting hole 97 for assistance to prevent the gantry 12 from tilting. Loosen the quick-release plate securing the gantry, and adjust the positions of the hydraulic cylinder 13 and the gantry 12 until the level 7 shows that the first connecting rod 6 is perpendicular to the test platform 15. During this process, the angle gauge 14 can be used to adjust the groove line of the gantry 12 parallel to the test platform 15 for aesthetic purposes. Generally, the two gantry frames 12 each carry two hydraulic cylinders 13, installed on the two front motor mounting points 81 and two rear motor mounting points 82 of the subframe 4. Currently, automobile manufacturers generally require the front motor mounting points 8 and the rear motor mounting points 82 to have a 180° phase difference for strength and fatigue testing. Figure 1As shown, the hydraulic cylinders 13 installed at the two front motor mounting points 81 and the two rear motor mounting points 82 are controlled by the test software to conduct the test simultaneously with a phase difference of 180°. The hydraulic cylinders 13 at the two front motor mounting points 81 are in phase, and the hydraulic cylinders 13 at the two rear motor mounting points 82 are in phase. Because the strength test load is large, using the original body bushings and motor mounting bushings of the subframe 4 would result in significant displacement or bushing damage, leading to misjudgment or the inability to conduct the test. Therefore, for the strength test, the body bushings around the subframe 4 are replaced with lower step fixing blocks 2 and upper step fixing blocks 3 that fit with the bushing holes, and the bushings at the motor mounting points are replaced with bushing replacement devices 94. For the fatigue test, the lower step fixing blocks 2 and upper step fixing blocks 3 are not installed, as the subframe 4 has its own original body bushings at this location. The bushing replacement device 94 in the middle of the universal joint 5 is not installed; the motor mounting bushings of the subframe 4 are used for the test. During fatigue testing, sufficient observation space is provided around the vehicle to facilitate observation of the location of cracks in the subframe.

[0040] Figure 2 This is an overall schematic diagram of the height-adjustable base 1 of the present invention. Figure 3 This is an exploded view of the height-adjustable base 1 of the present invention. Figure 4This is a cross-sectional schematic diagram of the height-adjustable base 1 of the present invention. The base 88 consists of a second base plate 89, a cylinder 18, and several reinforcing ribs 19. The second base plate 89 is provided with several first bolt through holes 17 for connecting to the test platform 15 or other extension fixtures. A third pin hole 34 is provided in the middle of the second base plate 89 for installing a pin 32. The cylinder 18 is provided with elongated holes 20 around its perimeter. The first fastener 22 passes through the arc-shaped washer 21, and the fixing seat 90 is fixed to an appropriate position in the inner hole of the cylinder 18 using the third bolt through holes 30. A first pin hole 29 is provided in the middle of the fixing seat 90 for the pin 32 to pass through. The arc-shaped washer 21 and the outer diameter of the cylinder 18 are in cylindrical contact. The arc-shaped contact surface 31 on the fixing seat 90 is in clearance fit with the inner hole of the cylinder 18. The outer cylindrical surface of the fixing seat 90, except for the arc-shaped contact surface 31, is recessed, which can reduce the friction when the fixing seat 90 moves. The upper part of the fixed seat 90 has a recessed stepped hole 91, which mates with the stepped boss 92 at the bottom of the connecting seat 23, thus securing the connecting seat 23 more firmly. The twelfth fastener 93 passes through the first countersunk bolt through hole 24 at the top of the connecting seat 23, fixing the connecting seat 23 to the second threaded hole 28. The bottom of the connecting seat 23 has a second pin hole 33 of appropriate depth, which accommodates the pin 32 when the fixed seat 90 descends to a certain position, and also avoids the adjusting bolt 26 and the connecting seat 23 having excessively long threads, making disassembly and assembly difficult. The adjusting bolt 26 passes through the middle first threaded hole 27 in the middle of the connecting seat 23 until it contacts the pin 32. The presence of the pin 32 prevents the adjusting bolt 26 from being too long. Loosen the first fastener 22, rotate the adjusting bolt 26 to adjust the vertical position of the fixed seat 90 and the connecting seat 23. After the position is adjusted, tighten the first fastener 22 and remove the adjusting bolt 26. Normally, the subframe 4 is fixed to the middle first threaded hole 27 on the upper part of the connecting seat 23 by fasteners. However, some subframes 4 may interfere with the connecting seat 23 or the cylinder 18. In this case, the subframe 4 can be fixed to the first threaded hole 25 on the upper periphery of the connecting seat 23.

[0041] Figure 5This is a cross-sectional schematic diagram of the universal joint device 5 of the present invention. A fisheye bearing 43 is installed at the first step 41 of the central shaft 47, with a clearance fit between the inner diameter of the fisheye bearing 43 and the outer diameter of the central shaft 47. A second snap ring groove 48 is provided at an appropriate position on the central shaft 47 to accommodate a shaft snap ring 49, restricting the axial movement of the fisheye bearing 43. The outer ring of the fisheye bearing 43 is placed at the second step 42 of the bearing housing 51, with a clearance fit between the outer ring of the fisheye bearing 43 and the inner hole of the bearing housing 51. A first snap ring groove 44 is provided at an appropriate position on the bearing housing 51 to accommodate a hole snap ring 45, restricting the axial movement of the fisheye bearing 43. The outer ring of the bearing housing 51 is clearance-fitted with the corresponding motor suspension bushing mounting hole on the subframe 4. The bearing housing 51 is inserted into the corresponding motor suspension bushing mounting hole on the subframe 4 in an appropriate direction. A third step 50 is used to restrict the axial movement of the bearing housing 51, and a circular baffle 39 is provided opposite the third step 50 on the bearing housing 51. The circular baffle 39 is fixed to the corresponding threaded hole of the bearing housing 51 by the third fastener 37. The outer diameter of the circular baffle 39 is larger than the inner hole of the corresponding motor suspension bushing mounting hole. The outer diameter of the circular baffle 39 and the third step 50 cooperate to fix the bushing replacement device 94 to the corresponding motor suspension bushing mounting hole on the subframe 4. An appropriate first gap 40 is left between the bearing housing 51 and the circular baffle 39. After the third fastener 37 is tightened, the bearing housing 51 is securely fastened to the corresponding motor suspension bushing mounting hole. The center point of the fisheye bearing 43 is consistent with the center point of the original suspension bushing on the motor suspension bushing mounting hole. The width of the two end faces of the central shaft 47 is consistent with the width of the two end faces of the original suspension bushing bolt mounting hole on the motor suspension bushing mounting hole. In this way, the remaining parts of the universal joint 5 can be used interchangeably during strength tests and fatigue tests. The above constitutes the bushing replacement device 94. The circular baffle 39 has a central through hole 38 with the first stop block 36 and the central shaft 47, leaving an appropriate gap to ensure that the circular baffle 39 does not interfere with the first stop block 36 and the central shaft 47 during the test. A first stop block 36 and a second stop block 95 are respectively installed on both sides of the central shaft 47. The second fastener 35 passes through the second countersunk bolt hole 52 on the first connecting plate 53 and the first stop block 36, connecting to the central shaft 47's central fifth threaded hole 96. The fourth fastener 46 passes through the second countersunk bolt hole 52 on the first connecting plate 53 and the second stop block 95, connecting to the central shaft 47's central fifth threaded hole 96. The upper ends of the two first connecting plates 53 are connected to the second connecting plate 55 by the fifth fastener 54. The second connecting plate 55 has a third threaded hole 56 for connecting to the first connecting rod 6 by a corresponding fastener. The axis of the third threaded hole 56 needs to pass through the center point of the fisheye bearing 43, so that the load of the hydraulic cylinder 13 can be correctly applied to the center point of the corresponding suspension bushing. The second gap 57 formed by the two first connecting plates 53 and the second connecting plate 55 must be ensured to not interfere with the subframe 4 during the test.

[0042] Figure 6 This is an exploded view of the column 85 of the present invention. The column 85 consists of a first base plate 59, a vertical plate 70, and two side plates 63. A sixth fastener 58, through the fourth countersunk bolt hole 62 on the first base plate 59 and the corresponding threaded hole at the bottom of the side plate 63, fixes the two side plates 63 to the first base plate 59. A sixth fastener 58, through the third countersunk bolt hole 60 on the first base plate 59 and the corresponding threaded hole at the bottom of the vertical plate 70, fixes the vertical plate 70 to the first base plate 59. Seventh fasteners 69, with corresponding threaded holes at both ends of the vertical plate 70, pass through the sixth countersunk bolt hole 66 on the side plate 63, connecting the vertical plate 70 to the side plates 63 at both ends. The sixth fasteners 58 at the third countersunk bolt hole 60 and the fourth countersunk bolt hole 62 must not protrude beyond the bottom plane of the first base plate 59. Several first elongated holes 61 are provided on the first base plate 59 for connecting the column 85 and the test platform 15. The side plate 63 has two sliding grooves 68 in the middle, allowing the crossbeam 84 to be adjusted up and down along the grooves 68. The side plate 63 and the upright plate 70 are respectively provided with a first lifting hole 65 and a second lifting hole 97 for lifting.

[0043] Figure 7 This is a schematic diagram of the overall structure of the crossbeam 84 of the present invention. The crossbeam 84 consists of two third connecting plates 71, two fourth connecting plates 74, and two limiting plates 79. The fourth connecting plates 74 have eighth countersunk bolt holes 75 on both sides. A ninth fastener 76 passes through the eighth countersunk bolt holes 75 to fix the fourth connecting plate 74 to the third connecting plate 71. The outer surface of the fourth connecting plate 74 has two protrusions 78, which are clearance-fitted with the sliding grooves 68 on the side plate 63, allowing the crossbeam 84 to be vertically adjusted along the column 85. The eighth fastener 73 passes through the seventh countersunk bolt hole 72 on the third connecting plate 71, and the limiting plate 79 is fixed to the third connecting plate 71 using the fourth threaded hole 80 on the limiting plate 79. The eleventh fastener 87 securely connects the crossbeam 84 to the columns 85 at both ends through the fourth bolt through hole 67 and the fifth bolt through hole 77.

[0044] Figure 8This is a schematic diagram of the fixing of the hydraulic cylinder 13 of the present invention. The fifth connecting plate 98 is connected to the end face of the hydraulic cylinder 13 by corresponding fasteners. The fifth connecting plate 98 has a through hole in the middle for the piston rod of the hydraulic cylinder 13 to pass through. The fifth connecting plate 98 has fourth steps 99 on both sides, which are clearance-fitted with the limiting plate 79 on the crossbeam 84 for fixing and adjusting the horizontal position of the hydraulic cylinder 13. Below the limiting plate 79, the sixth connecting plate 100 is connected to the fifth connecting plate 98 by the thirteenth fastener 101. The sixth connecting plate 100 has a through hole in the middle for the piston rod of the hydraulic cylinder 13 to pass through. The fifth connecting plate 98 and the sixth connecting plate 100 cooperate to fix the hydraulic cylinder 13 to the limiting plate 79 on the crossbeam 84. Loosening the thirteenth fastener 101 allows the horizontal position of the hydraulic cylinder 13 to be adjusted along the limiting plate 79.

[0045] Please see Figure 1 The diagram shows an application schematic of a subframe motor mounting point testing device according to the present invention. The loading method of the subframe motor mounting point testing device includes:

[0046] Step S1: Adjust the height of the height-adjustable base 1 according to the shape of the subframe 4;

[0047] Perform step S2: Remove the adjusting bolt 26 on the height-adjustable base 1 and fix the subframe 4 to the height-adjustable base 1 with the tenth fastener 86;

[0048] Perform step S3: Use angle ruler 14 to adjust the subframe 4 and height-adjustable base 1 to be parallel to the groove line of test platform 15, and use quick pressure plate 16 to fix the height-adjustable base 1;

[0049] Step S4: Use an overhead crane to place the gantry 12 equipped with hydraulic cylinder 13 at approximately the positions of the front motor suspension mounting point 81 and the rear motor suspension mounting point 82, and use the quick-pressing plate 16 to fix the gantry 12 to the test platform 15.

[0050] Perform step S5: Loosen the thirteenth fastener 101, connect the load sensor 11 below the hydraulic cylinder 13 to the second connecting rod 10, the slotted bearing 8, the first connecting rod 6, and the universal joint 5 in sequence, and tighten the relevant parts. Place the level 7 at the first connecting rod 6.

[0051] Execute step S6: Loosen the quick-release plate 16 that fixes the gantry frame 12, use an overhead crane to lift the lifting lug 83 on the hydraulic cylinder 13, and if necessary, add a second lifting hole 97 for assistance to prevent the gantry frame 12 from tilting. Adjust the position of the hydraulic cylinder 13 and the gantry frame 12 until the level 7 shows that the first connecting rod 6 is perpendicular to the test platform 15. During this process, the angle ruler 14 can be used to adjust the groove line of the gantry frame 12 parallel to the test platform 15 for aesthetic purposes.

[0052] Step S7: Tighten the thirteenth fastener 101, fix the gantry frame 12 with the quick-release plate 16, and use software to control the hydraulic cylinders 13 connected to the front motor mounting point 81 and the rear motor mounting point 82 to perform a strength or fatigue test with a phase difference of 180°. The hydraulic cylinders 13 connected to the front motor mounting point 81 and the rear motor mounting point 82 are in phase.

[0053] Compared with existing technologies, the subframe motor mounting point testing equipment and its loading method of the present invention have the following advantages:

[0054] This invention discloses a subframe motor mounting point testing device and its loading method. It not only allows for the use of subframes from different vehicle models during subframe motor mounting point testing, facilitating angle and position adjustments and ease of control, but also enables accurate replacement of body bushings and mounting bushings with appropriate fixtures during strength testing. This avoids bushing damage or insufficient rigidity leading to excessive travel, which could cause misjudgments or prevent testing from being conducted. The location of subframe cracks is easily observed during fatigue testing. The universal joint fixtures are interchangeable between strength and fatigue testing.

[0055] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to facilitate the description of this invention and to simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0056] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0057] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0058] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A test device for subframe motor mounting points, characterized in that, The system includes a height-adjustable base (1) for supporting and fixing the subframe (4); a gantry (12) spanning above the subframe (4), on which a hydraulic cylinder (13) is provided for adjusting its position along its length on the crossbeam (84) of the gantry (12); a load sensor (11) connected to the piston rod end of the hydraulic cylinder (13); a universal joint (5) for mounting to the front motor mounting point (81) or the rear motor mounting point (82) of the subframe (4); and a first connecting rod (6), a slotted bearing (8), and a second connecting rod (10) sequentially connected between the universal joint (5) and the load sensor (11), wherein the universal joint (5) and the slotted bearing (8) together constitute a two-force bar structure.

2. The subframe motor mounting point testing equipment according to claim 1, characterized in that, The height-adjustable base (1) includes a base (88), a cylinder (18) disposed on the base (88), and a fixing seat (90) disposed inside the cylinder (18). The cylinder (18) has multiple elongated holes (20) on its wall. A first fastener (22) passes through the elongated holes (20) to fix the fixing seat (90) at different height positions inside the cylinder (18).

3. The subframe motor mounting point testing equipment according to claim 1, characterized in that, The universal joint (5) includes a bearing housing (51), a fisheye bearing (43) installed in the bearing housing (51), and a central shaft (47) passing through the fisheye bearing (43). The center of the fisheye bearing (43) coincides with the center of the front motor mounting point (81) or the rear motor mounting point (82).

4. The subframe motor mounting point testing equipment according to claim 1, characterized in that, The column (85) of the gantry frame (12) is provided with a vertical sliding groove (68), and the fourth connecting plate (74) of the crossbeam (84) is provided with a protrusion (78) that fits the sliding groove (68) with a clearance.

5. The subframe motor mounting point testing equipment according to claim 1, characterized in that, The hydraulic cylinder (13) is connected to the crossbeam (84) via the fifth connecting plate (98). The fifth connecting plate (98) has a fourth step (99) on both sides. The crossbeam (84) has a limit plate (79). The fourth step (99) and the limit plate (79) are in clearance fit. The sixth connecting plate (100) is connected to the fifth connecting plate (98) via the thirteenth fastener (101) to clamp and fix the hydraulic cylinder (13) on the limit plate (79).

6. The subframe motor mounting point testing equipment according to claim 3, characterized in that, The width of both ends of the central shaft (47) is consistent with the width of the bolt mounting holes of the front motor mounting point (81) or the rear motor mounting point (82).

7. A loading method for a subframe motor mounting point test device according to any one of claims 1-6, characterized in that, Includes the following steps: S1: Adjust the height-adjustable base (1) to the appropriate height according to the shape of the subframe (4); S2: Fix the subframe (4) to the height-adjustable base (1); S3: Adjust the subframe (4) and the height-adjustable base (1) to be parallel to the groove line of the test platform (15) and fix them; S4: Move the gantry (12) equipped with the hydraulic cylinder (13) to the vicinity of the mounting point of the subframe (4) and fix it in place; S5: Connect the load sensor (11) of the hydraulic cylinder (13) to the universal joint (5) installed at the mounting point in sequence through the second connecting rod (10), the slotted bearing (8), and the first connecting rod (6); S6: Adjust the position of the gantry (12) and hydraulic cylinder (13) until the first connecting rod (6) is perpendicular to the test platform (15), and then fix the gantry (12) and hydraulic cylinder (13). S7: The hydraulic cylinder (13) at the motor mounting point (81) before connection and the hydraulic cylinder (13) at the motor mounting point (82) after connection are subjected to a loading test with a 180° phase difference.

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