Double-channel road spectrum fatigue test tool for front lower swing arm

Abstract

The utility model discloses a double-channel road spectrum fatigue test tool for a front lower swing arm, which comprises an auxiliary frame fixing unit, a lower swing arm ball head loading assembly is arranged on the left side of the auxiliary frame fixing unit, a Y-axis loading unit is arranged on the rear side of the lower swing arm ball head loading assembly, and a Y-axis loading unit is arranged on the rear side of the Y-axis loading unit. A Z-axis loading unit is arranged on the left side of the lower swing arm ball head loading assembly, and an X-axis loading unit is arranged on the left side of the Z-axis loading unit. The lower swing arm and auxiliary frame fixing unit comprises a vertically-arranged backup plate, and a first fixing support and a second fixing support which are used for fixing a front lower swing arm are arranged on one side of the backup plate. The lower swing arm ball head loading assembly comprises a ball head fixing block used for fixing the front lower swing arm. According to the utility model, the durability of the front lower swing arm can be tested by simulating load and motion conditions in actual use, the accuracy and reliability of a test result are improved, and the experiment cost is reduced to a greater extent.

Description

Technical Field

[0001] The utility model relates to the field of automobile parts testing tooling, in particular to a dual-channel road spectrum fatigue test tooling for a front lower swing arm. Background Art

[0002] The front lower control arm is a critical component in the automotive suspension system, connecting the steering knuckle and subframe. Its primary function is to enable vehicle steering and carry vehicle weight. As a safety feature, the front lower control arm's strength and durability must meet design requirements to ensure the safety of the driver and passengers. During vehicle operation, the suspension system is subjected to repeated loads, which can lead to component fatigue failure. Fatigue durability testing is required to verify the service life and reliability of the front lower control arm. Dual-channel road spectrum fatigue testing of automotive suspensions is a key test for component life verification. This test typically uses a dual-track structure on a test bench to constrain the ball joint in the Z direction and apply loads in the X and Y directions. The hydraulic cylinder and sensor also load the control arm ball joint as a whole. However, during testing, the interaction of loading forces in the dual-track structure can lead to inaccurate loads applied to the control arm ball joint. Furthermore, the hydraulic cylinder and control arm are connected via multiple fixtures, and the coordination between these fixtures can affect the load sensor readings, resulting in inaccurate load readings. Avoiding these two common issues is a key consideration in the design of dual-channel road spectrum fatigue testing fixtures. Utility Model Content

[0003] The utility model provides a dual-channel road spectrum fatigue test tooling for a front lower swing arm, which can simulate the load and motion conditions in actual use to test the durability of the front lower swing arm, improves the accuracy and reliability of the test results, and greatly reduces the experimental cost.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a dual-channel road spectrum fatigue test fixture for a front lower swing arm, comprising a subframe fixing unit, a lower swing arm ball head loading assembly is provided on the left side of the subframe fixing unit, a Y-axis loading unit is provided on the rear side of the lower swing arm ball head loading assembly, a Z-axis loading unit is provided on the left side of the lower swing arm ball head loading assembly, and an X-axis loading unit is provided on the left side of the Z-axis loading unit; the lower swing arm and the subframe fixing unit include a vertically arranged back plate, a first fixed support and a second fixed support for fixing the front lower swing arm are provided on one side of the back plate; the lower swing arm ball head loading assembly includes a ball head fixing block for fixing the front lower swing arm, a mounting plate is provided at the bottom of the ball head fixing block, a support frame is connected to the side of the mounting plate, a first connecting block is provided on one side of the support frame, and a fixing plate is provided on the upper side of the support frame ; The Z-axis loading unit includes a vertically arranged connecting rod, a second connecting block is provided on the upper side of the connecting rod, a fixed connecting plate is provided on the upper side of the second connecting block, and gantry brackets are vertically provided at both ends of the lower side of the fixed connecting plate; the X-axis loading unit includes a connecting disc arranged horizontally along the left and right directions, the connecting disc is connected to the first connecting block, and a power unit is provided on one side of the connecting disc; the Y-axis loading unit includes a first rod end joint bearing arranged opposite to each other, the first rod end joint bearing is respectively connected to the mounting plate and the fixed plate, the end of the first rod end joint bearing is provided with a connecting shaft, the end of the connecting shaft is provided with a connecting plate connecting the two, and a power unit is provided on one side of the connecting plate. The structure is streamlined and can be applied to the dual-channel road spectrum fatigue test of the front lower arm, which greatly reduces the mutual influence of the loading forces and realizes the precise loading of the ball head point.

[0005] Preferably, the power unit includes an MTS sensor connected to the connecting disc or the connecting plate, one side of the MTS sensor is connected to a second rod end joint bearing, one end of the second rod end joint bearing is provided with a U-shaped connecting block, one side of the U-shaped connecting block is provided with a guide shaft, one side of the guide shaft is provided with a hydraulic cylinder for driving it to move horizontally, and the MTS sensor is arranged between the second rod end joint bearing and the connecting disc to eliminate the influence of tooling on the force value read by the MTS sensor, so as to achieve accurate reading of the ball head point load by the MTS sensor.

[0006] Preferably, a support is sleeved on the outer side wall of the guide shaft, the guide shaft is slidably connected to the support, and the support is connected to the test workbench, which is easy to install and stable to move.

[0007] Preferably, the hydraulic cylinder is fixed on the test workbench through a mounting bracket, which is convenient for installation.

[0008] Preferably, third rod end joint bearings are provided on both the upper and lower sides of the connecting rod, and the connecting rod is connected to the connecting disc via the third rod end joint bearing at the bottom, which has a simple structure and convenient connection.

[0009] Preferably, a first pressing block is provided at one end of the first fixed support, which can avoid the problem of loose locking due to excessive rigidity of the tooling.

[0010] Preferably, a second pressing block is provided at one end of the second fixed support to avoid the problem of loose locking due to excessive rigidity of the tooling.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] The simple structure allows for dual-channel road spectrum fatigue testing of front lower control arms, significantly reducing the mutual influence of loading forces and achieving precise loading of the ball joint. The improved accuracy and stability of the tooling also enhances the repeatability of test results. It can simulate actual load and motion conditions to test the durability of the front lower control arm, improving the accuracy and reliability of test results and significantly reducing experimental costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional structural diagram of the utility model;

[0014] Figure 2 This is a three-dimensional structural diagram of the X-axis loading unit of the present invention;

[0015] Figure 3 This is a three-dimensional structural diagram of the Y-axis loading unit of the present utility model;

[0016] Figure 4 This is a three-dimensional structural diagram of the Z-axis loading unit of the present invention;

[0017] Figure 5 This is a three-dimensional structural diagram of the lower swing arm ball head loading assembly of the utility model;

[0018] Figure 6 It is a three-dimensional structural diagram of the auxiliary frame fixing unit of the present utility model.

[0019] Reference numerals:

[0020] 1. X-axis loading unit, 11. Connecting disc, 12. Power unit, 121. MTS sensor, 122. Second rod end joint bearing, 123. U-shaped connecting block, 124. Guide shaft, 125. Hydraulic cylinder, 126. Support, 2. Y-axis loading unit, 21. First rod end joint bearing, 22. Connecting plate, 23. Connecting shaft, 3. Z-axis loading unit, 31. Connecting rod, 32. Second connecting block, 33. Fixed connecting plate, 34. Gantry bracket, 35. Third rod end joint bearing, 4. Lower arm ball head loading assembly, 41. Ball head fixing block, 42. Mounting plate, 43. Support frame, 44. Fixed plate, 45. First connecting block, 5. Subframe fixing unit, 51. Back plate, 52. First fixed support, 54. First pressure block, 53. Second fixed support, 55. Second pressure block, 6. Front lower arm. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0022] like Figure 1-6As shown, the present invention is to solve the problem of being able to simulate the load and motion conditions in actual use to test the durability of the front lower arm, improve the accuracy and reliability of the test results, and greatly reduce the experimental cost. The following technical solutions are provided: a dual-channel road spectrum fatigue test fixture for the front lower arm, including a subframe fixing unit 5, a lower arm ball head loading assembly 4 is provided on the left side of the subframe fixing unit 5, a Y-axis loading unit 2 is provided on the rear side of the lower arm ball head loading assembly 4, a Z-axis loading unit 3 is provided on the left side of the lower arm ball head loading assembly 4, and the Z-axis loading unit 3 is provided on the left side of the lower arm ball head loading assembly An X-axis loading unit 1 is provided on the left side; the X-axis loading unit 1, the Y-axis loading unit 2, the Z-axis loading unit 3 and the lower arm ball head loading assembly 4 are connected together to provide a bidirectional loading force for the entire suspension system; the lower arm and subframe fixing unit 5 includes a vertically arranged support plate 51, one side of the support plate 51 is provided with a first fixing support 52 and a second fixing support 53 for fixing the front lower arm 6; the lower arm ball head loading assembly 4 includes a ball head fixing block 41 for fixing the front lower arm 6, the bottom of the ball head fixing block 41 is provided with a mounting plate 42, the mounting plate The side of the plate 42 is connected to a support frame 43, a first connecting block 45 is provided on one side of the support frame 43, and a fixed plate 44 is provided on the upper side of the support frame; the Z-axis loading unit 3 includes a vertically arranged connecting rod 31, a second connecting block 32 is provided on the upper side of the connecting rod 31, a fixed connecting plate 33 is provided on the upper side of the second connecting block 32, and gantry brackets 34 are vertically provided at both ends of the lower side of the fixed connecting plate 33; the X-axis loading unit 1 includes a connecting disc 11 arranged horizontally in the left and right directions, the connecting disc 11 is connected to the first connecting block 45, the connecting disc 11 is connected to the first connecting block 45, and the connecting disc 11 is connected to the first connecting block 45. A power unit 12 is provided on one side of the connecting disc 11; the Y-axis loading unit 2 includes a first rod end joint bearing 21 arranged opposite to each other, and the first rod end joint bearing 21 is respectively connected to the mounting plate 42 and the fixing plate 44, and a connecting shaft 23 is provided at the end of the first rod end joint bearing 21, and a connecting plate 22 connecting the two is provided at the end of the connecting shaft 23, and a power unit 12 is provided on one side of the connecting plate 22. The structure is streamlined and can be applied to the dual-channel road spectrum fatigue test of the front lower arm, which greatly reduces the mutual influence of the loading forces and realizes the precise loading of the ball head point.

[0023] In this embodiment, if Figure 2-3As shown, the power unit 12 includes an MTS sensor 121 connected to the connecting disc 11 or the connecting plate 22, one side of the MTS sensor 121 is connected to a second rod end joint bearing 122, one end of the second rod end joint bearing 122 is provided with a U-shaped connecting block 123, one side of the U-shaped connecting block 123 is provided with a guide shaft 124, and one side of the guide shaft 124 is provided with a hydraulic cylinder 125 for driving it to move horizontally. The MTS sensor 121 is set between the second rod end joint bearing 122 and the connecting disc 11 to eliminate the influence of tooling on the force value read by the MTS sensor 121, so that the MTS sensor 121 can accurately read the ball head point load.

[0024] In this embodiment, if Figure 2-3 As shown, a support 126 is sleeved on the outer wall of the guide shaft 124, and the guide shaft 124 is slidably connected to the support 126, and the support 126 is connected to the test workbench, which is easy to install and stable to move.

[0025] In this embodiment, if Figure 2-3 As shown, the hydraulic cylinder 125 is fixed on the test workbench through a mounting bracket, which is easy to install.

[0026] In this embodiment, if Figure 4 As shown, third rod end joint bearings 35 are provided on both the upper and lower sides of the connecting rod 31 , and the connecting rod 31 is connected to the connecting disc 11 through the third rod end joint bearing 35 at the bottom, which has a simple structure and is easy to connect.

[0027] In this embodiment, if Figure 6 As shown, a first pressing block 54 is provided at one end of the first fixing support 52 to avoid the problem of poor locking due to excessive rigidity of the tooling.

[0028] In this embodiment, if Figure 6 As shown, a second pressing block 55 is provided at one end of the second fixing support 53 to avoid the problem of poor locking due to excessive rigidity of the tooling.

[0029] In this embodiment, if Figure 1As shown, place the front lower arm 6 to be tested on the subframe fixing unit 5, use the first fixing support 52 and the second fixing support 53 to fix the front lower arm 6 on the support plate 51, ensure that it is firmly fixed, and check whether the ball head fixing block 41 of the lower arm ball head loading assembly 4 is tightly matched with the ball head part of the front lower arm 6; connect the connecting disc 11 of the X-axis loading unit 1 to the first connecting block 45, and check whether the connection of the power unit 12 is correct; install the Y-axis loading unit 2, ensure that the first rod end joint bearing 21 is connected to the mounting plate 42 and the fixing plate 44 respectively, and the connecting shaft 23 and the connecting plate 22 are correctly assembled; set the Z-axis loading unit 3 so that the connecting rod 31 passes through the second connecting block 3 2 is connected to the fixed connecting plate 33, and the gantry bracket 34 is fixed to the test workbench; the Z-axis loading unit 3 is used to apply vertical constraints to the front lower arm 6 to simulate the fixed state in actual use; the power unit 12 and hydraulic cylinder 125 of the X-axis loading unit 1 are used to apply periodic loads to the front lower arm 6 in the left and right directions, and the power unit 12 and hydraulic cylinder 125 of the Y-axis loading unit 2 are used to apply periodic loads to the front lower arm 6 in the front and back directions; the power unit 12 is started to start the fatigue endurance test on the front lower arm 6 to simulate the repeated loads borne by the lower arm during vehicle driving, the test process is monitored, and the test data is recorded using the MTS sensor 121.

[0030] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0031] In addition, the terms "first," "second," and so on, used in this utility model are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

Claims

1. A dual-channel road spectrum fatigue test tool for a front lower arm, characterized in that: include: A subframe fixing unit (5), a lower swing arm ball head loading assembly (4) is provided on the left side of the subframe fixing unit (5), a Y-axis loading unit (2) is provided on the rear side of the lower swing arm ball head loading assembly (4), a Z-axis loading unit (3) is provided on the left side of the lower swing arm ball head loading assembly (4), and an X-axis loading unit (1) is provided on the left side of the Z-axis loading unit (3); The lower swing arm and subframe fixing unit (5) comprises a vertically arranged support plate (51), and a first fixing support (52) and a second fixing support (53) for fixing the front lower swing arm (6) are provided on one side of the support plate (51); The lower swing arm ball head loading assembly (4) comprises a ball head fixing block (41) for fixing the front lower swing arm (6); a mounting plate (42) is provided at the bottom of the ball head fixing block (41); a support frame (43) is connected to the side of the mounting plate (42); a first connecting block (45) is provided on one side of the support frame (43); and a fixing plate (44) is provided on the upper side of the support frame; The Z-axis loading unit (3) comprises a vertically arranged connecting rod (31), a second connecting block (32) is arranged on the upper side of the connecting rod (31), a fixed connecting plate (33) is arranged on the upper side of the second connecting block (32), and gantry brackets (34) are vertically arranged at both ends of the lower side of the fixed connecting plate (33); The X-axis loading unit (1) comprises a connecting disc (11) arranged horizontally in the left-right direction, the connecting disc (11) is connected to the first connecting block (45), and a power unit (12) is provided on one side of the connecting disc (11); The Y-axis loading unit (2) includes first rod end joint bearings (21) arranged opposite to each other, the first rod end joint bearings (21) being connected to the mounting plate (42) and the fixing plate (44) respectively, a connecting shaft (23) being provided at the end of the first rod end joint bearing (21), a connecting plate (22) connecting the two being provided at the end of the connecting shaft (23), and a power unit (12) being provided on one side of the connecting plate (22).

2. The dual-channel road spectrum fatigue test fixture for the front lower arm according to claim 1, characterized in that: The power unit (12) includes an MTS sensor (121) connected to the connecting disc (11) or the connecting plate (22), one side of the MTS sensor (121) is connected to a second rod end joint bearing (122), one end of the second rod end joint bearing (122) is provided with a U-shaped connecting block (123), one side of the U-shaped connecting block (123) is provided with a guide shaft (124), and one side of the guide shaft (124) is provided with a hydraulic cylinder (125) for driving the guide shaft (124) to move horizontally.

3. The dual-channel road spectrum fatigue test fixture for the front lower arm according to claim 2, characterized in that: A support (126) is sleeved on the outer wall of the guide shaft (124), the guide shaft (124) is slidably connected to the support (126), and the support (126) is connected to the test workbench.

4. The dual-channel road spectrum fatigue test fixture for the front lower arm according to claim 3, characterized in that: The hydraulic cylinder (125) is fixedly arranged on the test workbench via a mounting support.

5. The dual-channel road spectrum fatigue test fixture for the front lower arm according to claim 1, characterized in that: The third rod end joint bearings (35) are provided on both the upper and lower sides of the connecting rod (31), and the connecting rod (31) is connected to the connecting disc (11) through the third rod end joint bearings (35) at the bottom.

6. The dual-channel road spectrum fatigue test fixture for the front lower arm according to claim 1, characterized in that: A first pressing block (54) is provided at one end of the first fixed support (52).

7. The dual-channel road spectrum fatigue test fixture for the front lower arm according to claim 1, characterized in that: A second pressing block (55) is provided at one end of the second fixed support (53).

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