Front lower swing arm three-way road spectrum fatigue test tool

Abstract

The utility model relates to a front lower swing arm three-way road spectrum fatigue test tool which comprises a product fixing frame, an auxiliary support, an X-axis loading unit, a Y-axis loading unit and a Z-axis loading unit, the product fixing frame and the auxiliary support are arranged side by side left and right, the left side of the product fixing frame is provided with the product fixing frame, and the right side of the product fixing frame is provided with the Y-axis loading unit. A product with the right end extending leftwards is installed on the product fixing frame, a front lower swing arm ball head loading assembly is installed at the right end of the product, a Y-axis loading unit is installed on the right side of the auxiliary support, and an X-axis loading unit is installed on the rear side of the product. The Y-axis loading unit and the X-axis loading unit are in butt joint with the right side and the rear side of the front lower swing arm ball head loading assembly. The device has the characteristics that the whole structure is simple, the mutual influence of loading force is greatly reduced, the accurate loading of a ball head point is ensured, the fatigue life of a sliding rail in a detection unit is greatly prolonged, and the like.

Description

Technical Field

[0001] This utility model relates to the field of forging die technology, and in particular to a three-channel road spectrum fatigue test fixture for a front lower swing arm. Background Technology

[0002] like Figure 5 As shown, the front lower control arm is a crucial component connecting the steering knuckle, subframe, and shock absorber bracket. Its primary functions are vehicle steering and load-bearing. As a safety component within the suspension system, the front lower control arm's strength and durability must meet design requirements to ensure occupant safety. The three-channel road spectrum fatigue test for automotive suspensions is a key test for verifying component lifespan. This test typically uses a double-slide rail structure on a test bench to constrain the ball joint in the Z-axis and apply loads in the X / Y / U directions. However, during testing, the mutual influence of loading forces in the double-slide rail structure leads to inaccurate loads applied to the ball joint of the control arm. Furthermore, the X / Y loading typically uses cylindrical support rails to constrain and support the linear cylinder, directly connecting to the spherical bearing. This structure cannot adequately absorb lateral forces from other directions, resulting in frequent bearing wear and failure in the support rails. To address these technical issues and facilitate the testing of the front lower control arm, designing a user-friendly testing fixture is essential. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a three-channel road spectrum fatigue test fixture for a front lower swing arm, which has the characteristics of simple overall structure, greatly reducing the mutual influence of loading forces, ensuring accurate loading of the ball head point, and greatly improving the fatigue life of the slide rail in the test unit.

[0004] The technical solution adopted by this utility model to solve its technical problem is as follows: a three-channel road spectrum fatigue test fixture for a front lower swing arm is provided, including a fixture fixing frame, an auxiliary support, an X-axis loading unit, a Y-axis loading unit and a Z-axis loading unit. The fixture fixing frame and the auxiliary support are arranged side by side. A product fixing frame is provided on the left side of the fixture fixing frame. A product extending from the right end to the left is installed on the product fixing frame. A front lower swing arm ball head loading assembly is installed on the right end of the product. A Y-axis loading unit is installed on the right side of the auxiliary support. An X-axis loading unit is installed on the rear side of the product. The Y-axis loading unit and the X-axis loading unit are connected to the right and rear sides of the front lower swing arm ball head loading assembly. A U-axis loading unit with its main shaft facing downward to the right is installed on the fixture fixing frame. A vertically downward Z-axis loading unit is installed between the fixture fixing frame and the auxiliary support. The lower end of the Z-axis loading unit is connected to the upper side of the front lower swing arm ball head loading assembly.

[0005] The X-axis loading unit and Y-axis loading unit adopt the same structure. Both the X-axis loading unit and the Y-axis loading unit include a loading unit base, a slide rail structure, and a connecting frame. Two slide rail structures are installed side by side on the loading unit base. Two connecting frames are slidably installed on the slide rail structures. A push cylinder is installed on the loading unit base. An upwardly bent docking extension is provided on one end of the loading unit base near the front lower control arm ball joint loading assembly. One end of the push cylinder is fixed to the docking extension, and a connecting panel is provided on the other end. Horizontally extended connecting frames are provided on both ends of the connecting panel near the front lower control arm ball joint loading assembly. A connecting rod is installed on one end of the connecting frame near the lower control arm ball joint loading assembly. Spring plates are installed on both ends of the connecting rod. A docking bracket is installed between the spring plates near the front lower control arm ball joint loading assembly.

[0006] In this technical solution, X-axis, Y-axis, and U-axis loading units are installed to perform fatigue testing on the steering unit of the front lower control arm. A Z-axis loading unit is installed to absorb the stress generated during the application of force by the X-axis, Y-axis, and U-axis loading units, ensuring the accuracy of the X-axis, Y-axis, and U-axis loading units during operation. At the same time, two spring plates are installed at both ends of the connecting rod to control the deformation at that point. When the connecting rod is compressed or stretched, the two spring plates will deform, thereby absorbing the deformation and achieving fatigue testing. The structure that generates this impact force is a push cylinder. The thrust of the push cylinder does not act on the slide rail structure, which can effectively extend the service life of the slide rail structure.

[0007] As a supplement to this technical solution, the bottom of the connecting frame is equipped with sliding feet that cover the slide rail structure. The sliding feet are provided to facilitate the smooth sliding of the connecting frame.

[0008] As a supplement to this technical solution, a left support frame is longitudinally installed on the upper end of the tooling fixing frame, a leg structure is installed on the upper end of the auxiliary bracket, a middle connecting plate is horizontally installed between the left support frame and the leg structure, the Z-axis loading unit includes a vertical spring plate, a vertical support rod and a longitudinal connecting rod for docking, docking nodes are provided on both sides of the middle of the middle connecting plate, a vertical spring plate is installed on the docking node, a vertical support rod is installed at the lower end of the vertical spring plate, a second vertical spring plate is installed at the lower end of the vertical support rod, a longitudinal connecting rod for docking is installed between the two vertical spring plates located at the lower end of the vertical support rod, and the longitudinal connecting rod for docking docks with the upper end face of the front lower swing arm ball head loading assembly.

[0009] In this technical solution, a left support frame and a foot structure are set up to support the middle connecting plate, ensuring that the middle connecting plate can withstand a certain deformation. At the same time, two vertical support rods and four vertical spring plates are used to facilitate the measurement of deformation, so as to make it easy to see the fatigue test action intuitively. A longitudinal connecting rod is installed to facilitate docking with the front lower swing arm ball joint loading assembly.

[0010] As a supplement to this technical solution, the product fixing frame includes a horizontal docking frame, a vertical docking frame, and an inner bushing. A bracket docking surface is provided on the left side of the tooling fixing frame. The horizontal docking frame and the vertical docking frame are installed side by side on the bracket docking surface. An inner bushing is installed inside both the horizontal docking frame and the vertical docking frame.

[0011] In this technical solution, horizontal and vertical docking frames are set up to facilitate docking with the product, and an inner liner is installed to achieve docking with the product.

[0012] As a supplement to this technical solution, the U-axis loading unit includes a tilting cylinder, a connector, an upper plug, and a tilting support rod. The main shaft of the tilting cylinder tilts downward to the right. The tilting cylinder is mounted on a tooling fixture. The upper and lower ends of the tilting support rod are respectively equipped with an upper plug and a lower plug. The connector is mounted on the main shaft of the tilting cylinder. The connector and the upper plug are connected by a rotating shaft. Both the lower plug and the upper plug adopt a concave panel structure. The two ends of the concave opening of the lower plug are embedded with a connecting bushing structure.

[0013] In this technical solution, a tilting cylinder is installed to apply a thrust to the product, thereby achieving fatigue monitoring. When the main shaft of the tilting cylinder extends and pushes the tilting support rod, the tilting support rod pushes the product, causing the product to pull the Z-axis loading unit, which in turn deforms the Z-axis loading unit, thus achieving fatigue detection.

[0014] As a supplement to this technical solution, the front lower control arm ball joint loading assembly includes a lower base, an upper cover plate, a first connecting steel sleeve, and a second connecting steel sleeve. The lower base has upwardly extending docking side plates on both sides. The upper cover plate is installed on the lower base. An opening is formed on the front lower control arm ball joint loading assembly. A through hole is provided on the lower base. The first connecting steel sleeve and the second connecting steel sleeve are installed in the upper and lower ends of the through hole.

[0015] In this technical solution, a device is formed by installing a lower base and an upper cover plate to cover the front end of the product, so that the device can be docked with the X-axis loading unit, Y-axis loading unit and Z-axis loading unit to facilitate detection in different directions.

[0016] As a supplement to this technical solution, the first connecting steel sleeve, the second connecting steel sleeve, and the through hole form an interference fit.

[0017] Beneficial Effects: This utility model relates to a three-channel road spectrum fatigue testing fixture for a front lower control arm. It uses X-axis, Y-axis, and U-axis loading units to detect fatigue in the steering unit of the front lower control arm. A Z-axis loading unit is installed to absorb the stress generated during the application of force by the X-axis, Y-axis, and U-axis loading units, ensuring the accuracy of their operation. Two spring plates are installed at both ends of the connecting rod to control deformation at those points. When the connecting rod is compressed or stretched, the two spring plates deform, absorbing this deformation and thus achieving fatigue detection. The structure generating this impact force is a hydraulic cylinder. The thrust of the hydraulic cylinder does not act on the slide rail structure, effectively extending its service life. It features a simple overall structure, significantly reduces the mutual influence of loading forces, ensures accurate loading of the ball joint, and greatly improves the fatigue life of the slide rail in the testing unit. Attached Figure Description

[0018] Figure 1 This is a structural view of the present invention;

[0019] Figure 2 This is a structural view of the X-axis loading unit and the Y-axis loading unit described in this utility model;

[0020] Figure 3 This is a structural view of the Z-axis loading unit described in this utility model;

[0021] Figure 4 This is a structural view of the U-axis loading unit described in this utility model;

[0022] Figure 5 This is a structural view of the product fixing frame described in this utility model;

[0023] Figure 6 This is an exploded view of the structure of the ball joint loading assembly of the front lower control arm described in this utility model.

[0024] Illustrations: 1. Tooling fixture, 2. Auxiliary support, 3. Y-axis loading unit, 4. X-axis loading unit, 5. Front lower swing arm ball joint loading assembly, 6. Z-axis loading unit, 7. Product fixture, 8. U-axis loading unit, 9. Loading unit base, 10. Docking extension, 11. Sliding leg, 12. Connecting frame, 13. Slide rail structure, 14. Push cylinder, 15. Connecting rod, 16. Spring plate, 17. Docking support, 18. Leg structure, 19. Middle connecting plate, 20. Vertical spring plate, 21. 22. Vertical support rod, 23. Longitudinal connecting rod for docking, 24. Inclined hydraulic cylinder, 25. Left support frame, 26. Connecting joint, 27. Upper plug, 28. Inclined support rod, 29. Lower plug, 30. Dating bushing structure, 31. Bracket docking surface, 32. Horizontal docking frame, 33. Vertical docking frame, 34. Inner bushing, 35. Product, 36. Lower base, 37. Upper cover plate, 38. Through hole, 39. First connecting steel sleeve, 40. Second connecting steel sleeve, 41. Right end detection point, 42. Middle detection point. Detailed Implementation

[0025] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0026] The present invention relates to a three-channel road spectrum fatigue testing fixture for a front lower control arm, such as... Figure 1 As shown in Figure 6, the fixture includes a tooling frame 1, an auxiliary support 2, an X-axis loading unit 4, a Y-axis loading unit 3, and a Z-axis loading unit 6. The tooling frame 1 and the auxiliary support 2 are arranged side by side. A product mounting frame 7 is provided on the left side of the tooling frame 1. A product 34 extending from the right end to the left is mounted on the product mounting frame 7. A front lower swing arm ball joint loading assembly 5 is mounted on the right end of the product 34. A Y-axis loading unit 3 is mounted on the right side of the auxiliary support 2. An X-axis loading unit 4 is mounted on the rear side of the product 34. The Y-axis loading unit 3 and the X-axis loading unit 4 are connected to the right and rear sides of the front lower swing arm ball joint loading assembly 5. A U-axis loading unit 8 with its main shaft facing downward to the right is mounted on the tooling frame 1. A vertically downward Z-axis loading unit 6 is installed between the tooling frame 1 and the auxiliary support 2. The lower end of the Z-axis loading unit 6 is connected to the upper side of the front lower swing arm ball joint loading assembly 5.

[0027] The X-axis loading unit 4 and Y-axis loading unit 3 adopt the same structure. Both the X-axis loading unit 4 and Y-axis loading unit 3 include a loading unit base 9, a slide rail structure 13, and a connecting frame 12. Two slide rail structures 13 are installed side by side on the loading unit base 9. Two connecting frames 12 are slidably installed on the slide rail structures 13. A push cylinder 14 is installed on the loading unit base 9. An upwardly bent docking extension 10 is provided on one end of the loading unit base 9 near the front lower swing arm ball joint loading assembly 5. One end of the push cylinder 14 is fixed on the docking extension 10, and a connecting panel is provided on the other end. Both ends of the connecting panel are provided with horizontally extending connecting frames 12 near the front lower swing arm ball joint loading assembly 5. A connecting rod 15 is installed on one end of the connecting frame 12 near the lower swing arm ball joint loading assembly 5. Spring plates 16 are installed on both ends of the connecting rod 15. A docking bracket 17 is installed between the spring plates 16 near the front lower swing arm ball joint loading assembly 5.

[0028] In this technical solution, X-axis loading unit 4, Y-axis loading unit 3, and U-axis loading unit 8 are installed to perform fatigue testing on the steering unit of the front lower control arm. Z-axis loading unit 6 is installed to absorb the stress generated during the application of force by X-axis loading unit 4, Y-axis loading unit 3, and U-axis loading unit 8, ensuring the accuracy of X-axis loading unit 4, Y-axis loading unit 3, and U-axis loading unit 8 during operation. At the same time, two spring plates 16 are installed at both ends of the connecting rod 15 to control the deformation at that point. When the connecting rod 15 is compressed or stretched, the two spring plates 16 will deform, thereby absorbing the deformation and realizing fatigue testing. The structure that generates this impact force is the push cylinder 14. The thrust of the push cylinder 14 does not act on the slide rail structure 13, which can effectively extend the service life of the slide rail structure 13.

[0029] As a supplement to this technical solution, the bottom of the connecting frame 12 is equipped with a sliding support foot 11 that covers the slide rail structure 13. The sliding support foot 11 is provided to facilitate the smooth sliding of the connecting frame 12.

[0030] As a supplement to this technical solution, a left support frame 24 is longitudinally installed on the upper end of the tooling fixing frame 1, and a support leg structure 18 is installed on the upper end of the auxiliary bracket 2. A middle connecting plate 19 is horizontally installed between the left support frame 24 and the support leg structure 18. The Z-axis loading unit 6 includes a vertical spring plate 20, a vertical support rod 21, and a longitudinal connecting rod 22 for docking. Dating nodes are provided on both sides of the middle of the middle connecting plate 19. A vertical spring plate 20 is installed on the docking node. A vertical support rod 21 is installed at the lower end of the vertical spring plate 20. A second vertical spring plate 20 is installed at the lower end of the vertical support rod 21. A longitudinal connecting rod 22 for docking is installed between the two vertical spring plates 20 located at the lower end of the vertical support rod 21. The longitudinal connecting rod 22 for docking docks with the upper end face of the front lower swing arm ball head loading assembly 5.

[0031] In this technical solution, a left support frame 24 and a foot structure 18 are set up as support components for the middle connecting plate 19 to ensure that the middle connecting plate 19 can withstand a certain deformation. At the same time, two vertical support rods 21 and four vertical spring plates 20 are used to facilitate the display of deformation, so as to make it easy to see the fatigue test action intuitively. A longitudinal connecting rod 22 is installed to facilitate docking with the front lower swing arm ball joint loading assembly 5.

[0032] As a supplement to this technical solution, the product fixing frame 7 includes a horizontal docking frame 31, a vertical docking frame 32 and an inner bushing 33. The tooling fixing frame 1 has a bracket docking surface 30 on its left side. The horizontal docking frame 31 and the vertical docking frame 32 are installed side by side on the bracket docking surface 30. The inner bushing 33 is installed inside both the horizontal docking frame 31 and the vertical docking frame 32.

[0033] In this technical solution, a horizontal docking frame 31 and a vertical docking frame 32 are set to facilitate docking with the product 34, and an inner liner 33 is installed to achieve docking with the product 34.

[0034] As a supplement to this technical solution, the U-axis loading unit 8 includes a tilting cylinder 23, a connector 25, an upper plug 26, and a tilting support rod 27. The main shaft of the tilting cylinder 23 tilts downward to the right. The tilting cylinder 23 is mounted on the tooling fixture 1. The upper plug 26 and the lower plug 28 are respectively installed at the upper and lower ends of the tilting support rod 27. The connector 25 is installed on the main shaft of the tilting cylinder 23. The connector 25 and the upper plug 26 are connected by a rotating shaft. Both the lower plug 28 and the upper plug 26 adopt a concave panel structure. The concave opening of the lower plug 28 has a connecting bushing structure 29 embedded in both ends.

[0035] In this technical solution, a tilting cylinder 23 is installed to apply a thrust to the product 34, thereby achieving fatigue monitoring. When the main shaft of the tilting cylinder 23 extends and pushes the tilting support rod 27, the tilting support rod 27 pushes the product 34, causing the product 34 to pull the Z-axis loading unit 6, causing the Z-axis loading unit 6 to deform, thereby achieving fatigue detection.

[0036] As a supplement to this technical solution, the front lower control arm ball joint loading assembly 5 includes a lower base 35, an upper cover plate 36, a first connecting steel sleeve 38, and a second connecting steel sleeve 39. The lower base 35 has upwardly extending docking side plates on both sides. The upper cover plate 36 is installed on the lower base 35. An opening is formed on the front lower control arm ball joint loading assembly 5. The lower base 35 is provided with a through hole 37. The first connecting steel sleeve 38 and the second connecting steel sleeve 39 are installed in the upper and lower ends of the through hole 37.

[0037] In this technical solution, a device is formed by installing a lower base 35 and an upper cover plate 36 to cover the front end of the product 34, so that the device can be docked with the X-axis loading unit 4, the Y-axis loading unit 3 and the Z-axis loading unit 6, which facilitates detection in different directions.

[0038] As a supplement to this technical solution, the first connecting steel sleeve 38, the second connecting steel sleeve 39, and the through hole 37 form an interference fit.

[0039] Example

[0040] When performing fatigue testing, such as Figure 5 As shown, a right-end detection point 40 is provided on the right end of the product 34, and a middle detection point 41 is provided in the middle of the product 34.

[0041] During installation, the two legs on the left end of product 34 are connected to the horizontal docking frame 31 and the vertical docking frame 32 respectively. After completion, the ball joint loading assembly 5 of the front lower control arm is sleeved on the right end detection point 40. At the same time, the right end detection point 40 is connected to the first connecting steel sleeve 38 and the second connecting steel sleeve 39. After completion, the longitudinal connecting rod 22 of the Y-axis loading unit 3 is connected to the upper cover plate 36 of the ball joint loading assembly 5 of the front lower control arm. The two sides of the lower base 35 are connected to the docking brackets 17 of the X-axis loading unit 4 and the Y-axis loading unit 3 respectively. Finally, the lower plug 28 of the U-axis loading unit 8 is connected to the middle detection point 41.

[0042] After the above docking is completed, fatigue testing is performed. When the structure of X-axis loading unit 4 is running, the X-axis loading force is ensured to pass more stably through the center point of the ball at the right end detection point 40, ensuring that no deviation occurs. The spring plates 16 and vertical spring plates 20 on X-axis loading unit 4, Y-axis loading unit 3 and Z-axis loading unit 6 fully absorb the lateral forces from Y-axis loading unit 3 and U-axis loading unit 8, thereby greatly reducing the lateral force on the slide rail structure 13 and thus greatly improving the fatigue life of the slide rail structure 13.

[0043] When the Y-axis loading unit 3 is running, the spring plates 16 and vertical spring plates 20 on the X-axis loading unit 4, Y-axis loading unit 3 and Z-axis loading unit 6 will also absorb the lateral force, thereby ensuring that the Y-axis loading unit 3 can pass through the center point of the ball at the right end detection point 40 more stably, avoiding the lateral force on the slide rail structure 13, and thus greatly improving the fatigue life of the slide rail structure 13.

[0044] The Z-axis loading unit 6 constrains the ball head point of the product in the Z direction, ensuring that the loading forces on the ball head point in the X-axis loading unit 4, Y-axis loading unit 3 and U-axis loading unit 8 do not affect each other, thus ensuring more accurate X / Y / U loading forces at the ball head point.

Claims

1. A three-channel road spectrum fatigue testing fixture for a front lower control arm, characterized in that: The system includes a tooling fixture (1), an auxiliary support (2), an X-axis loading unit (4), a Y-axis loading unit (3), and a Z-axis loading unit (6). The tooling fixture (1) and the auxiliary support (2) are arranged side by side. A product fixture (7) is provided on the left side of the tooling fixture (1). A product (34) extending from the right end to the left is installed on the product fixture (7). A front lower swing arm ball joint loading assembly (5) is installed on the right end of the product (34). A Y-axis loading unit is installed on the right side of the auxiliary support (2). Yuan (3), the product (34) is equipped with an X-axis loading unit (4) on the rear side, the Y-axis loading unit (3) and the X-axis loading unit (4) are connected to the right and rear sides of the front lower swing arm ball head loading assembly (5), the tooling fixture (1) is equipped with a U-axis loading unit (8) with the main shaft facing downward to the right, the tooling fixture (1) and the auxiliary bracket (2) are equipped with a vertically downward Z-axis loading unit (6), the lower end of the Z-axis loading unit (6) is connected to the upper side of the front lower swing arm ball head loading assembly (5); The X-axis loading unit (4) and Y-axis loading unit (3) adopt the same structure. Both the X-axis loading unit (4) and Y-axis loading unit (3) include a loading unit base (9), a slide rail structure (13), and a connecting frame (12). Two slide rail structures (13) are installed side by side on the loading unit base (9). Two connecting frames (12) are slidably installed on the slide rail structure (13). A push cylinder (14) is installed on the loading unit base (9). A forward-facing cylinder is provided on the end of the loading unit base (9) near the front lower swing arm ball joint loading assembly (5). The upper bent docking extension (10) has one end of the push cylinder (14) fixed on the docking extension (10) and the other end is provided with a connecting panel. Both ends of the connecting panel are provided with horizontally extending connecting brackets (12) near the front lower swing arm ball head loading assembly (5). A connecting rod (15) is installed on the end of the connecting bracket (12) near the front lower swing arm ball head loading assembly (5). Spring plates (16) are installed on both ends of the connecting rod (15). A docking bracket (17) is installed between the spring plates (16) near the front lower swing arm ball head loading assembly (5).

2. The three-channel road spectrum fatigue testing fixture for a front lower control arm according to claim 1, characterized in that: The bottom of the connecting frame (12) is equipped with a sliding support (11) that covers the slide rail structure (13).

3. The three-channel road spectrum fatigue testing fixture for a front lower control arm according to claim 1, characterized in that: The tooling fixture (1) has a left support frame (24) mounted longitudinally on its upper end, and the auxiliary bracket (2) has a support leg structure (18) mounted on its upper end. A middle connecting plate (19) is mounted transversely between the left support frame (24) and the support leg structure (18). The Z-axis loading unit (6) includes a vertical spring plate (20), a vertical support rod (21), and a longitudinal connecting rod (22) for docking. The middle connecting plate (19) has docking nodes on both sides of its middle section. A vertical spring plate (20) is installed on the docking node. A vertical support rod (21) is installed at the lower end of the vertical spring plate (20). A second vertical spring plate (20) is installed at the lower end of the vertical support rod (21). A longitudinal connecting rod (22) for docking is installed between the two vertical spring plates (20) located at the lower end of the vertical support rod (21). The longitudinal connecting rod (22) for docking docks with the upper end face of the ball joint loading assembly (5) of the front lower swing arm.

4. The three-channel road spectrum fatigue testing fixture for a front lower control arm according to claim 1, characterized in that: The product fixing frame (7) includes a horizontal docking frame (31), a vertical docking frame (32) and an inner bushing (33). The tooling fixing frame (1) has a bracket docking surface (30) on its left side. The horizontal docking frame (31) and the vertical docking frame (32) are installed side by side on the bracket docking surface (30). The inner bushing (33) is installed inside both the horizontal docking frame (31) and the vertical docking frame (32).

5. The three-channel road spectrum fatigue testing fixture for a front lower control arm according to claim 1, characterized in that: The U-axis loading unit (8) includes a tilting cylinder (23), a connector (25), an upper plug (26), and a tilting support rod (27). The main shaft of the tilting cylinder (23) is tilted to the lower right. The tilting cylinder (23) is mounted on a tooling fixture (1). The upper and lower ends of the tilting support rod (27) are respectively equipped with an upper plug (26) and a lower plug (28). The connector (25) is mounted on the main shaft of the tilting cylinder (23). The connector (25) and the upper plug (26) are connected by a rotating shaft. The lower plug (28) and the upper plug (26) both adopt a concave panel structure. The concave opening of the lower plug (28) is embedded with a connecting bushing structure (29) at both ends.

6. The three-channel road spectrum fatigue testing fixture for a front lower control arm according to claim 1, characterized in that: The front lower control arm ball joint loading assembly (5) includes a lower base (35), an upper cover plate (36), a first connecting steel sleeve (38), and a second connecting steel sleeve (39). The lower base (35) has upwardly extending docking side plates on both sides. The upper cover plate (36) is installed on the lower base (35). An opening is formed on the front lower control arm ball joint loading assembly (5). A through hole (37) is provided on the lower base (35). The first connecting steel sleeve (38) and the second connecting steel sleeve (39) are installed in the upper and lower ends of the through hole (37).

7. The three-channel road spectrum fatigue testing fixture for a front lower control arm according to claim 6, characterized in that: An interference fit is formed between the first connecting steel sleeve (38), the second connecting steel sleeve (39), and the through hole (37).

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