A pull-torque coupling endurance tooling for testing automotive bushings

Abstract

The utility model relates to test equipment technical field discloses a kind of for testing the tensile-torsional coupling durability tool of automobile bush, including welding high base, the upper portion of welding high base is provided with bearing seat assembly, the center of bearing seat assembly is provided with torsion base assembly, the upper portion of torsion base assembly is provided with bush clamping assembly, the upper portion of bush clamping assembly is provided with radial loading assembly, the right side of torsion base assembly is provided with push-torsion conversion assembly;The bearing seat assembly includes bearing seat installed in the top of welding high base by bolt.This utility model, through the intercoordination between the structure of bearing seat assembly, torsion base assembly and its bush clamping assembly etc., this tool connects two linear actuators, carries out tensile-torsional coupling loading test to automobile bush, can also replace loading fixed seat and measure different size bush, to reach simulation real working condition.

Description

Technical Field

[0001] This utility model relates to the field of testing equipment technology, and in particular to a tension-torsion coupling durability tooling for testing automotive bushings. Background Technology

[0002] With the rapid development of the automotive manufacturing industry, the handling and comfort of automobiles are constantly improving, and automotive bushings, as "buffer components" of the chassis, play a crucial role. Automotive bushings effectively isolate and reduce wear and vibration between parts, preventing vibration from being transmitted to the passenger compartment, thereby contributing to improved vehicle stability and safety. The better the durability of the automotive bushings, the longer the vehicle's lifespan, the greater its stability, and the higher its safety. Therefore, it is necessary to simulate actual working conditions and design suitable automotive bushing durability testing fixtures to conduct durability tests on automotive bushings.

[0003] The actual working conditions of automotive bushings are quite complex, often involving coupled loading of torsional and radial forces. For example, Chinese Patent CN107179187A discloses a durability testing bench for automotive bushings, and Chinese Patent CN106124173A discloses a bushing durability testing device. Both can perform durability testing on automotive bushings with high reliability and low testing cost, but they cannot simulate actual working conditions for coupled loading testing of automotive bushings. Furthermore, since different automobiles often use bushings of different sizes, the tooling has poor versatility. Therefore, a tension-torsion coupled durability tooling for testing automotive bushings is proposed to solve these problems. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a tension-torsion coupling durability fixture for testing automotive bushings, which aims to improve the problems of existing testing fixtures that are difficult to simulate actual working conditions for testing automotive bushings and are difficult to adapt to automotive bushings of different sizes.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a tension-torsion coupling durability tooling for testing automotive bushings, comprising a welded heightening base, a bearing seat assembly disposed above the welded heightening base, a torsion base assembly disposed at the center of the bearing seat assembly, a bushing clamping assembly disposed above the torsion base assembly, a radial loading assembly disposed above the bushing clamping assembly, and a push-torsion conversion assembly disposed on the right side of the torsion base assembly; The bearing housing assembly includes a bearing housing bolted to the top of a welded raised base. An end cap is bolted to the left side of the bearing housing, and an axial locking nut is installed on the left side of the end cap. A tapered roller bearing is installed on the right side of the end cap, and an outer sleeve and an inner sleeve are respectively installed on the right side of the tapered roller bearing. Two sets of tapered roller bearings are provided, with the other set of tapered roller bearings installed on the right side of the inner sleeve. The torsion base assembly includes a fixing plate that is bolted to the top of the welded heightening base. A fixing seat is bolted to the top of the fixing plate. There are two sets of fixing seats, which are symmetrically arranged about the center line of the fixing plate. The left fixing seat is bolted to a positioning shaft, and the right fixing seat is bolted to a swing shaft. Positioning components are fixedly connected to the side of both sets of fixing seats away from the fixing plate. The push-torque conversion assembly includes a thrust connector, a thrust shaft is bolted to the inner wall of the thrust connector, an actuating rod is rotatably connected to the outer arc surface of the thrust shaft, a conversion shaft is rotatably connected to the side of the actuating rod away from the thrust shaft, and a push-torque conversion assembly is bolted to the left side of the conversion shaft.

[0006] As a further description of the above technical solution: The positioning component includes a cylindrical pin fixedly connected to the side of the two sets of fixed seats away from the fixed plate. The left inner wall of the swing shaft is inserted into the outer arc surface of the right cylindrical pin, and the right inner wall of the positioning shaft is inserted into the outer arc surface of the left cylindrical pin. Two sets of axial locking nuts are provided, and the inner walls of the two sets of axial locking nuts are respectively installed on the outer ends of the swing shaft and the positioning shaft. The positioning shaft, the fixed seat, and the swing shaft are all machined with a stop for positioning. The outer arc surfaces of the swing shaft and the positioning shaft match each other, and the outer arc surface of the swing shaft matches the inner surface of the inner sleeve.

[0007] As a further description of the above technical solution: The bushing clamping assembly includes a loading fixing seat bolted to the top of the fixing plate. A steel sleeve is bolted to the inner surface of the loading fixing seat. An automotive bushing is mounted on the inner surface of the steel sleeve. A long-shank bolt is mounted on the inner wall of the automotive bushing. A hexagonal tightening block and a hexagonal fixing block are mounted on the outer wall of the long-shank bolt. A lock nut is threaded to the left end of the long-shank bolt.

[0008] As a further description of the above technical solution: The radial loading component includes a connecting plate, and two sets of locking plates are bolted to the bottom of the connecting plate. The two sets of locking plates are symmetrically arranged about the center line of the connecting plate, and a connecting block is bolted to the bottom of each set of locking plates.

[0009] As a further description of the above technical solution: The hexagonal fixing block and hexagonal tightening block are made of high-hardness CrMnTi. The parts of both that contact the automotive bushing are dotted flat teeth. The hexagonal fixing block and hexagonal tightening block are hexahedral in shape. The loading fixing seat has a cylindrical hole machined inside and is cut into two parts after machining.

[0010] As a further description of the above technical solution: The locking plate and the connecting block are provided with a T-shaped groove on one side close to each other, and the T-shaped groove matches the hexagonal surface of the hexagonal fixing block.

[0011] As a further description of the above technical solution: The inner surfaces of the inner ring of the tapered roller bearing, the inner surface of the axial locking nut, and the inner surface of the inner sleeve are all matched. The outer rings of the two sets of tapered roller bearings are matched with the outer arc surfaces of the outer sleeves, and the outer arc surfaces of the outer sleeves are matched with the inner arc surfaces of the bearing housings.

[0012] As a further description of the above technical solution: An expansion sleeve is fixedly connected to the inner wall of the push-torque converter, and the expansion sleeve is fixedly connected to the outer arc surface of the swing shaft.

[0013] This utility model has the following beneficial effects: In this invention, through the mutual cooperation between the bearing seat assembly, the torsion base assembly and the bushing clamping assembly, the tooling connects two linear actuators to perform a tension-torsion coupling load test on the automotive bushing. It can also replace the loading fixing seat to test bushings of different sizes, thereby simulating real working conditions and adapting to automotive bushings of different sizes. Attached Figure Description

[0014] Figure 1 This is a three-dimensional schematic diagram of a tension-torsion coupling durability tooling for testing automotive bushings proposed in this utility model. Figure 2 An exploded view of a bearing housing assembly for a tension-torsion coupling durability tooling for testing automotive bushings, as proposed in this utility model. Figure 3 This is a three-dimensional schematic diagram of the fixing plate of a tension-torsion coupling durability tool for testing automotive bushings proposed in this utility model. Figure 4 An exploded view of a bushing clamping assembly for a tension-torsion coupling durability tooling for testing automotive bushings, as proposed in this utility model. Figure 5 This is a three-dimensional schematic diagram of a hexagonal fixing block for a tension-torsion coupling durability tooling for testing automotive bushings, as proposed in this utility model. Figure 6This utility model presents a three-dimensional schematic diagram of a hexagonal tightening block for a tension-torsion coupling durability tooling for testing automotive bushings. Figure 7 This utility model provides an overall three-dimensional schematic diagram of the connecting plate of a tension-torsion coupling durability tooling for testing automotive bushings. Figure 8 This utility model presents a push-torsion conversion component and its expansion sleeve disassembly diagram for a tension-torsion coupling durability tooling for testing automotive bushings. Figure 9 A three-dimensional schematic diagram of the welding heightening base of a tension-torsion coupling durability tooling for testing automotive bushings proposed in this utility model. Figure 10 This invention presents a disassembled schematic diagram of the thrust shaft and its thrust connector of a tension-torsion coupling durability tooling for testing automotive bushings.

[0015] Legend: 1. Bearing housing assembly; 11. Axial locking nut; 12. End cap; 13. Tapered roller bearing; 14. Outer sleeve; 15. Inner sleeve; 16. Bearing housing; 2. Torsion base assembly; 21. Positioning shaft; 22. Fixed seat; 23. Fixed plate; 24. Cylindrical pin; 25. Swing shaft; 3. Bushing clamping assembly; 31. Hexagonal fixing block; 32. Automotive bushing; 33. Loading fixed seat; 34. Steel sleeve; 35. Hexagonal tightening block; 36. Locking nut; 37. Long shank bolt; 4. Radial loading assembly; 41. Connecting plate; 42. Locking upright plate; 43. Connecting block; 5. Push-torque conversion assembly; 51. Thrust connector; 52. Thrust shaft; 53. Actuating rod; 54. Push-torque conversion component; 55. Expansion sleeve; 56. Conversion shaft; 6. Welded heightening base. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Reference Figures 1-2This utility model provides an embodiment of a tension-torsion coupling durability tooling for testing automotive bushings, comprising a welded elevation base 6, a bearing seat assembly 1 disposed above the welded elevation base 6, a torsion base assembly 2 disposed at the center of the bearing seat assembly 1, the welded elevation base 6 supporting subsequent components, the bearing seat assembly 1 providing stable support and a rotational foundation for the torsion base assembly 2, the torsion base assembly 2 bearing and transmitting motion, a bushing clamping assembly 3 disposed above the torsion base assembly 2, the bushing clamping assembly 3 clamping and fixing the test piece, a radial loading assembly 4 disposed above the bushing clamping assembly 3, the radial loading assembly 4 applying radial force, and a push-torsion conversion assembly 5 disposed on the right side of the torsion base assembly 2; the push-torsion conversion assembly 5 converting the motion mode.

[0018] Reference Figures 2-3 The bearing housing assembly 1 includes a bearing housing 16 bolted to the top of the welded heightening base 6. An end cap 12 is bolted to the left side of the bearing housing 16, supporting the end cap 12. An axial locking nut 11 is installed on the left side of the end cap 12, achieving the purpose of installation and fastening. A tapered roller bearing 13 is installed on the right side of the end cap 12. An outer sleeve 14 and an inner sleeve 15 are respectively installed on the right side of the tapered roller bearing 13. The outer sleeve 14 and the inner sleeve 15 serve as a connection, and the diameter of the inner sleeve 15 is smaller than the diameter of the outer sleeve 14. Two sets of tapered roller bearings 13 are provided, with another set of tapered roller bearings 13 installed on the right side of the inner sleeve 15. The arrangement of the two sets of tapered roller bearings 13 provides support for the torsion base assembly 2 and ensures the accuracy of the torsion angle during the testing of the automotive bushing 32.

[0019] Reference Figures 3-4The torsion base assembly 2 includes a fixing plate 23 bolted to the top of the welded heightening base 6. A fixing seat 22 is bolted to the top of the fixing plate 23. Two sets of fixing seats 22 are arranged symmetrically about the center line of the fixing plate 23. This symmetrical layout ensures the accuracy and stability of the installation positions of the positioning shaft 21 and the swing shaft 25, resulting in uniform force distribution on all components during operation. This avoids deformation or displacement caused by uneven force distribution, thereby ensuring the accuracy of the test results. The left fixing seat 22... A positioning shaft 21 is bolted on and serves as a positioning and reference point, providing an accurate positional reference for the installation and movement of other components and ensuring the relative positional accuracy between the components. A swing shaft 25 is bolted on the right fixed seat 22. The swing shaft 25 is a key component for transmitting torsional motion. It transmits the torsional motion from the push-torsion conversion component 5 to the bushing clamping component 3, realizing the axial torsional loading of the bushing. Positioning components are fixedly connected to the side of both fixed seats 22 away from the fixed plate 23. The positioning components facilitate the installation and fixing of the positioning shaft 21 and its swing shaft 25.

[0020] Reference Figure 1 , Figure 8 and Figure 10The push-torque conversion assembly 5 includes a thrust connector 51. A thrust shaft 52 is bolted to the inner wall of the thrust connector 51. Tightening the bolts clamps and fixes the thrust shaft 52. An actuating rod 53 is rotatably connected to the outer arc surface of the thrust shaft 52. A conversion shaft 56 is rotatably connected to the side of the actuating rod 53 away from the thrust shaft 52. A push-torque conversion component 54 is bolted to the left side of the conversion shaft 56. The thrust shaft 52 is connected to the actuating rod 53 via a spherical bearing and a hole using a retaining ring without ear. The actuating rod 53 is connected to the conversion shaft 56 via a spherical bearing and a hole using a retaining ring without ear. The positioning component includes a cylindrical pin 24 fixedly connected to the side of the two sets of fixed seats 22 away from the fixed plate 23. The cylindrical pin 24 facilitates the installation and positioning of the positioning shaft 21 and its swing shaft 25. The left inner wall of the swing shaft 25 is inserted into the outer arc surface of the right cylindrical pin 24. The right inner wall of the positioning shaft 21... The inner wall of the side is inserted into the outer arc surface of the cylindrical pin 24 on the left side. The insertion setting can achieve the predetermined purpose. There are two sets of axial locking nuts 11. The inner walls of the two sets of axial locking nuts 11 are respectively installed on the outer ends of the swing shaft 25 and the positioning shaft 21. The axial locking nuts 11 can stably install the pre-positioned swing shaft 25 and positioning shaft 21. The positioning shaft 21, the fixed seat 22 and the swing shaft 25 are all machined with stop positioning. The stop positioning further improves the positioning accuracy, limits the relative displacement and rotation deviation between components, ensures that the installation position of each component is accurate, and makes the swing shaft 25 more stable when transmitting torsional motion, avoiding the influence of position deviation on the test results. The outer arc surfaces of the swing shaft 25 and the positioning shaft 21 match each other. The outer arc surface of the swing shaft 25 matches the inner surface of the inner sleeve 15. The matching setting facilitates the placement of the inner sleeve 15 and other components.

[0021] Reference Figures 4-6 The bushing clamping assembly 3 includes a loading fixing seat 33 bolted to the top of the fixing plate 23. A steel sleeve 34 is bolted to the inner surface of the loading fixing seat 33, and an automotive bushing 32 is mounted on the inner surface of the steel sleeve 34. The automotive bushing 32 is installed inside the steel sleeve 34, and an interference fit or other fastening method ensures a tight connection between the automotive bushing 32 and the steel sleeve 34, preventing radial displacement of the bushing during testing and ensuring the accuracy of radial and torsional loading during testing. The inner wall of the automotive bushing 32 is fitted with… The long shank bolt 37 has a hexagonal tightening block 35 and a hexagonal fixing block 31 mounted on its outer wall. By tightening the long shank bolt 37, the hexagonal tightening block 35 and the hexagonal fixing block 31 are brought closer to each other, thereby clamping the automotive bushing 32 and restricting its axial movement. The left end of the long shank bolt 37 is threaded with a lock nut 36. The lock nut 36 ensures that the hexagonal tightening block 35 and the hexagonal fixing block 31 always maintain a clamping force on the automotive bushing 32, thus maintaining the stability of the clamping assembly.

[0022] Reference Figure 1 and Figure 7The radial loading assembly 4 includes a connecting plate 41. Two sets of locking plates 42 are bolted to the bottom of the connecting plate 41. The two sets of locking plates 42 are symmetrically arranged about the centerline of the connecting plate 41. The connecting plate 41 is used to connect a vertical linear actuator. When the linear actuator actuates, the force is transmitted to the two sets of locking plates 42 through the connecting plate 41. The symmetrical arrangement of the two sets of locking plates 42 ensures a uniform distribution of the radial force applied to the automotive bushing 32. Connecting blocks 43 are bolted to the bottom of each set of locking plates 42. The hexagonal fixing block 31 and the hexagonal tightening block 35 are made of high-hardness 20CrMnTi, which can withstand greater pressure. The clamping force is applied without deformation, ensuring the clamping effect on the automotive bushing 32 during testing. The parts of both clamping blocks that contact the automotive bushing 32 are dotted flat teeth. The dotted flat tooth design increases the friction with the surface of the automotive bushing 32, further enhancing the clamping force and preventing the automotive bushing 32 from sliding or displacing when subjected to radial and torsional forces, ensuring the accuracy of the test. The hexagonal fixing block 31 and the hexagonal tightening block 35 are hexagonal in shape. The hexagonal shape provides multiple flat surfaces, making it easy to tighten or loosen using tools such as wrenches. The loading fixing seat 33 has a cylindrical hole machined inside. After machining, it is cut into two parts. The split design, after installation, forms a ring-shaped clamping effect on the automotive bushing 32 and the steel sleeve 34, enhancing the fixing effect.

[0023] Reference Figure 2 , Figure 4 and Figure 7 The locking plate 42 and the connecting block 43 are provided with T-shaped grooves on one side close to each other. The T-shaped grooves match the hexagonal surface of the hexagonal fixing block 31. The setting of the connecting block 43 facilitates the clamping and fixing of the hexagonal fixing block 31 and the hexagonal tightening block 35. The inner surface of the inner ring of the tapered roller bearing 13, the inner surface of the axial locking nut 11 and the inner surface of the inner sleeve 15 are all matched. The outer rings of the two sets of tapered roller bearings 13 match the outer arc surface of the outer sleeve 14. The outer arc surface of the outer sleeve 14 matches the inner arc surface of the bearing seat 16. The matching setting can facilitate the installation. The inner wall of the push-torque conversion component 54 is fixedly connected to the expansion sleeve 55. The expansion sleeve 55 is fixedly connected to the outer arc surface of the swing shaft 25. The setting of the expansion sleeve 55 can effectively eliminate the gap between the components, accurately convert the displacement stroke of the linear actuator into the torsion angle and transmit it to the automotive bushing 32, avoid the test error caused by the gap, greatly improve the accuracy of the test, and ensure that the test results can truly reflect the performance of the automotive bushing 32 under actual working conditions.

[0024] Working principle: This fixture is connected to two linear actuators to achieve tension-torsion coupling loading test of the automotive bushing 32. The connecting plate 41 on the radial loading assembly 4 is connected to the vertical linear actuator, applying radial tension and compression force to the automotive bushing 32. The thrust connector 51 on the thrust-torsion conversion assembly 5 is connected to the horizontal linear actuator. When the horizontal linear actuator moves, the thrust connector 51 is displaced by the thrust shaft 52 held by the tightening bolt. The thrust shaft 52 is connected to the actuator by means of a spherical bearing and a lugless retaining ring. The actuator 53 is connected to the conversion shaft 56 via a spherical bearing and a lugless retaining ring. The conversion shaft 56 is fixedly connected to the push-torque converter 54 via a nut. The push-torque converter 54 is also fixedly connected to the swing shaft 25 via an expansion sleeve 55. In this way, the displacement of the horizontal linear actuator drives the thrust shaft 52 to move, which in turn drives the actuator 53 to move, causing the conversion shaft 56 to rotate. Finally, the rotation is transmitted to the swing shaft 25 through the push-torque converter 54 and the expansion sleeve 55, realizing the axial torsion of the automotive bushing 32.

[0025] The displacement stroke of the horizontal linear actuator is calculated using trigonometric functions, which can be accurately converted into the torsion angle of the automotive bushing 32. The tapered roller bearing 13 in the bearing housing assembly 1 has its inner ring axially positioned by the axial locking nut 11, the inner sleeve 15, and the shoulder on the torsion base assembly 2. The outer ring is axially positioned by the end cover 12, the outer sleeve 14, and the bearing housing 16, ensuring the stability of the torsion base assembly 2's rotation. The positioning shaft 21 and the fixed seat 22, as well as the swing shaft 25 and the fixed seat 22, are all machined with stop edges for positioning. Furthermore, the fixed seat 22 and the swing shaft 25, the fixed plate 23 and the loading fixed seat 33 are all positioned by cylindrical pins 24, effectively... To ensure the coaxiality of the torsion shaft, the test piece automotive bushing 32 is press-fitted into the test piece steel sleeve 34. The steel sleeve 34 and the loading fixing seat 33 are clamped and fixed by bolts. The bolts pass through the hexagonal fixing block 31 and the automotive bushing 32 and are threadedly connected to the hexagonal tightening block 35. The locking nut 36 is used for further fixing. The hexagonal fixing block 31 and the hexagonal tightening block 35 are made of 20CrMnTi with high hardness. The part in contact with the automotive bushing 32 is dotted flat teeth, which helps to better clamp the automotive bushing 32 and prevent the bushing from shifting during the test. By changing the loading fixing seat 33, the tensile-torsional coupling durability test can be carried out on automotive bushings 32 of different sizes.

[0026] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A tension-torsion coupling durability tooling for testing automotive bushings, comprising a welded heightening base (6), characterized in that: A bearing seat assembly (1) is provided above the welding heightening base (6), a torsion base assembly (2) is provided at the center of the bearing seat assembly (1), a bushing clamping assembly (3) is provided above the torsion base assembly (2), a radial loading assembly (4) is provided above the bushing clamping assembly (3), and a push-torque conversion assembly (5) is provided on the right side of the torsion base assembly (2). The bearing housing assembly (1) includes a bearing housing (16) bolted to the top of the welded heightening base (6). An end cap (12) is bolted to the left side of the bearing housing (16). An axial locking nut (11) is installed on the left side of the end cap (12). A tapered roller bearing (13) is installed on the right side of the end cap (12). An outer sleeve (14) and an inner sleeve (15) are respectively installed on the right side of the tapered roller bearing (13). Two sets of tapered roller bearings (13) are provided. The other set of tapered roller bearings (13) is installed on the right side of the inner sleeve (15). The torsion base assembly (2) includes a fixing plate (23) that is bolted to the top of the welded heightening base (6). A fixing seat (22) is bolted to the top of the fixing plate (23). There are two sets of fixing seats (22). The two sets of fixing seats (22) are symmetrically arranged about the center line of the fixing plate (23). The left fixing seat (22) is bolted to a positioning shaft (21), and the right fixing seat (22) is bolted to a swing shaft (25). The side of the two sets of fixing seats (22) away from the fixing plate (23) is fixedly connected to a positioning component. The push-torque conversion assembly (5) includes a thrust connector (51), a thrust shaft (52) is bolted to the inner wall of the thrust connector (51), an actuating rod (53) is rotatably connected to the outer arc surface of the thrust shaft (52), a conversion shaft (56) is rotatably connected to the side of the actuating rod (53) away from the thrust shaft (52), and a push-torque conversion assembly (54) is bolted to the left side of the conversion shaft (56).

2. The tension-torsion coupling durability fixture for testing automotive bushings according to claim 1, characterized in that: The positioning component includes a cylindrical pin (24) fixedly connected to the side of the two sets of fixed seats (22) away from the fixed plate (23). The left inner wall of the swing shaft (25) is inserted into the outer arc surface of the right cylindrical pin (24). The right inner wall of the positioning shaft (21) is inserted into the outer arc surface of the left cylindrical pin (24). Two sets of axial locking nuts (11) are provided. The inner walls of the two sets of axial locking nuts (11) are respectively installed on the outer ends of the swing shaft (25) and the positioning shaft (21). The positioning shaft (21), the fixed seat (22), and the swing shaft (25) are all machined with a stop for positioning. The outer arc surfaces of the swing shaft (25) and the positioning shaft (21) match each other. The outer arc surface of the swing shaft (25) matches the inner surface of the inner sleeve (15).

3. The tension-torsion coupling durability fixture for testing automotive bushings according to claim 1, characterized in that: The bushing clamping assembly (3) includes a loading fixing seat (33) bolted to the top of the fixing plate (23). A steel sleeve (34) is bolted to the inner surface of the loading fixing seat (33). An automotive bushing (32) is mounted on the inner surface of the steel sleeve (34). A long shank bolt (37) is mounted on the inner wall of the automotive bushing (32). A hexagonal tightening block (35) and a hexagonal fixing block (31) are mounted on the outer wall of the long shank bolt (37). A lock nut (36) is threaded to the left end of the long shank bolt (37).

4. The tension-torsion coupling durability fixture for testing automotive bushings according to claim 1, characterized in that: The radial loading component (4) includes a connecting plate (41), and two sets of locking plates (42) are bolted to the bottom of the connecting plate (41). The two sets of locking plates (42) are symmetrically arranged with respect to the center line of the connecting plate (41). The bottom of the two sets of locking plates (42) is bolted to a connecting block (43).

5. A tension-torsion coupling durability fixture for testing automotive bushings according to claim 3, characterized in that: The hexagonal fixing block (31) and the hexagonal tightening block (35) are made of 20CrMnTi. The part of both that contacts the car bushing (32) is dotted flat teeth. The hexagonal fixing block (31) and the hexagonal tightening block (35) are hexagonal in shape. The loading fixing seat (33) has a cylindrical hole machined inside. After machining, it is cut into two parts.

6. The tension-torsion coupling durability fixture for testing automotive bushings according to claim 4, characterized in that: The locking plate (42) and the connecting block (43) are provided with a T-shaped groove on one side close to each other, and the T-shaped groove matches the hexagonal surface of the hexagonal fixing block (31).

7. A tension-torsion coupling durability fixture for testing automotive bushings according to claim 1, characterized in that: The inner ring of the tapered roller bearing (13), the inner surface of the axial locking nut (11) and the inner surface of the inner sleeve (15) are all matched. The outer rings of the two sets of tapered roller bearings (13) are matched with the outer arc surface of the outer sleeve (14). The outer arc surface of the outer sleeve (14) is matched with the inner arc surface of the bearing housing (16).

8. The tension-torsion coupling durability fixture for testing automotive bushings according to claim 1, characterized in that: The inner wall of the push-torque converter (54) is fixedly connected to an expansion sleeve (55), which is fixedly connected to the outer arc surface of the swing shaft (25).

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