Frame bushing fatigue testing device

Abstract

The invention discloses a frame bushing fatigue test device which comprises a bottom table, the top surface of the bottom table is connected with a top disc through a supporting column, the bottom surface of the top disc is provided with an inner sliding groove, the inner side wall of the inner sliding groove is fixedly connected with a sliding rod, the sliding rod is slidably connected with a sliding cavity, the sliding rod is sleeved with a spring, and the top surface of the bottom table is rotatably connected with an outer ring sleeve and an inner ring sleeve. The outer ring sleeve and the inner ring sleeve are coaxially arranged, a side wave-shaped ring is arranged on the outer side face of the outer ring sleeve, a plurality of outer tooth blocks are evenly arranged on the outer ring sleeve, a top wave-shaped ring is arranged on the top face of the inner ring sleeve, and a plurality of inner tooth blocks are evenly arranged on the inner ring sleeve. Simulation of vibration, left-right swing and simultaneous existence of the buffer assembly in the frame bushing in the vertical direction is successfully realized, the simulation of frame bushing fatigue test is greatly improved, the structural arrangement is compact, the automation degree is high, and the frame bushing fatigue test efficiency is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile manufacturing equipment, and particularly relates to a fatigue test device for a vehicle frame bushing. Background Art

[0002] The vehicle frame bushing includes an inner liner cylinder, an outer liner cylinder and a buffer assembly located between the two. The inner liner cylinder in the vehicle frame bushing is directly connected to a bolt or a pin on an actual vehicle, while the outer liner cylinder is press-fitted and fixed to a vehicle frame or a suspension component. The vehicle frame bushing mainly uses the buffer assembly to absorb vibration and shock and isolate noise. The fatigue test of the vehicle frame bushing is mainly to test the reliability and durability of the buffer assembly during the vertical vibration and left-right swing of the vehicle frame bushing.

[0003] At present, common fatigue test devices or systems for vehicle frame bushings on the market include hydraulic servo fatigue testing machines, electro-hydraulic servo fatigue test systems, multi-axis vibration tables, etc. However, the above-mentioned existing equipment not only has a large volume and high price, but generally tests the entire suspension system installed with the vehicle frame bushing to indirectly obtain the reliability and durability of the vehicle frame bushing, which makes the test process cumbersome and inefficient. At the same time, the above-mentioned existing equipment generally can only test the performance of the vehicle frame bushing when vibrating in a certain direction alone, and the simulation is poor.

[0004] Therefore, a fatigue test device for a vehicle frame bushing is proposed. Summary of the Invention

[0005] The purpose of the present invention is to provide a fatigue test device for a vehicle frame bushing to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A fatigue test device for a vehicle frame bushing, used to test a vehicle frame bushing, the vehicle frame bushing is composed of an inner liner cylinder, a buffer assembly and an outer liner cylinder, including a bottom platform, the top surface of the bottom platform is connected to a top plate through a support column, an inner sliding groove is opened on the bottom surface of the top plate, a sliding rod is fixedly connected to the inner side wall of the inner sliding groove, a sliding cavity is slidably connected to the sliding rod, a spring is sleeved on the sliding rod, the top surface of the bottom platform is rotatably connected to an outer ring sleeve and an inner ring sleeve, the outer ring sleeve and the inner ring sleeve are coaxially arranged, a side wave ring is arranged on the outer side surface of the outer ring sleeve, a plurality of outer tooth blocks are uniformly arranged around the central axis of the outer side surface of the outer ring sleeve, a top wave ring is arranged on the top surface of the inner ring sleeve, and a plurality of inner tooth blocks are uniformly arranged around the central axis of the inner side surface of the inner ring sleeve;

[0007] The sliding cavity is vertically slidably connected to a movable rod, a left folding rod and a right folding rod are arranged on the side wall of the movable rod, and a clamping ring sleeve is arranged at the bottom end of the movable rod, and the clamping ring sleeve is used for clamping the inner side surface of the inner liner cylinder;

[0008] The bottom end of the left folding rod is attached to the top corrugated ring, and the bottom side of the right folding rod is attached to the side corrugated ring;

[0009] On the top surface of the bottom platform, there is a vertically telescopic movable platform. An installation groove is opened on the top surface of the movable platform, and a clamping block is provided on the inner side wall of the installation groove. The clamping block is used for clamping the outer side surface of the outer lining cylinder;

[0010] On the bottom platform, there are also a first one-way motor and a second one-way motor. A first gear is sleeved on the movable end of the first one-way motor, and the first gear meshes with the external gear block. A second gear is sleeved on the movable end of the second one-way motor, and the second gear meshes with the internal gear block.

[0011] Preferably: A top rotation groove is opened on the top surface of the bottom platform. The outer ring sleeve and the inner ring sleeve rotate within the top rotation groove. There are three support columns, all of which are perpendicular to the top surface of the bottom platform.

[0012] Preferably: The two ends of the spring are respectively fixedly connected to the inner side wall of the inner sliding groove and the outer side surface of the sliding cavity.

[0013] Preferably: The interior of the bottom platform is hollow. The first one-way motor and the second one-way motor are both arranged on the inner bottom surface of the bottom platform, and the movable ends of the first one-way motor and the second one-way motor pass through the top surface of the bottom platform.

[0014] Preferably: A central through hole is opened at the center of the top surface of the bottom platform, and an oil cylinder is arranged at the center of the inner bottom surface of the bottom platform. The movable end of the oil cylinder is fixedly connected to the bottom surface of the movable platform.

[0015] Preferably: The interior of the sliding cavity is hollow. The movable rod is vertically and slidably connected to the inner side wall of the sliding cavity and passes through the bottom surface of the sliding cavity.

[0016] Preferably: A side through hole is opened on the side wall of the sliding cavity, and a sliding hole is opened at the top of the sliding cavity. The sliding rod passes through the sliding hole.

[0017] Preferably: A number of snap ring sleeves are provided, and the diameter becomes smaller from top to bottom.

[0018] Preferably: The bottom end of the left folding rod is provided with a ball, and the ball can roll freely.

[0019] Preferably: The width of the top corrugated ring is greater than the maximum fluctuation amplitude of the side corrugated ring, and the height of the side corrugated ring is greater than the maximum fluctuation amplitude of the top corrugated ring.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. Through the settings and coordinated cooperation of the outer ring sleeve, side corrugated ring, inner ring sleeve, top corrugated ring, etc., this device has successfully simulated the buffer components in the frame bushing under vertical vibration, left - right swing, and the co - existence of both, greatly improving the simulation of the fatigue test of the frame bushing. With a compact structure and high degree of automation, it has significantly improved the efficiency of the fatigue test of the frame bushing and is suitable for popularization and use in the production process of frame bushings.

[0022] 2. Through the settings and coordinated cooperation of the movable table, sliding cavity, movable rod, left folding rod, right folding rod, etc., this device has not only successfully achieved the rapid press - fitting of the frame bushing on this device, but also cooperated with the outer ring sleeve and inner ring sleeve to realize the simulation fatigue test of the buffer components in the frame bushing. With a delicate structure and low manufacturing cost, it is suitable for popularization and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above - mentioned and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. Among them:

[0024] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 is a schematic diagram of the internal structure of the bottom platform in the present invention;

[0026] Figure 3 is a schematic diagram of the top surface structure of the bottom platform in the present invention;

[0027] Figure 4 is a schematic diagram of the structures of the outer ring sleeve and inner ring sleeve in the present invention;

[0028] Figure 5 is a top view of the outer ring sleeve and inner ring sleeve in the present invention;

[0029] Figure 6 is a bottom view of the outer ring sleeve and inner ring sleeve in the present invention;

[0030] Figure 7 is a schematic diagram of the bottom surface structure of the top plate in the present invention;

[0031] Figure 8 is a connection diagram of the outer ring sleeve and inner ring sleeve in the present invention;

[0032] Figure 9 is an application schematic diagram of the present invention.

[0033] In the figure: 1. Bottom platform; 11. Top rotating groove; 12. Central through hole; 13. Support column; 14. Top plate; 2. First one-way motor; 21. First gear; 22. Second one-way motor; 23. Second gear; 24. Oil cylinder; 25. Movable platform; 26. Installation groove; 27. Clamping block; 3. Inner sliding groove; 31. Spring; 32. Slide bar; 4. Sliding cavity; 41. Sliding opening; 42. Side through hole; 43. Movable rod; 44. Left folding rod; 45. Right folding rod; 46. Snap ring sleeve; 47. Ball; 5. Outer ring sleeve; 51. Outer tooth block; 52. Side corrugated ring; 6. Inner ring sleeve; 61. Inner tooth block; 62. Top corrugated ring; 7. Inner lining cylinder; 71. Buffer assembly; 72. Outer lining cylinder. Detailed implementation mode

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to the scope of protection of the present invention.

[0035] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0036] In the description of the present invention, the meaning of several is one or more, the meaning of multiple is more than two, and understandings such as greater than, less than, exceeding, etc. do not include the present number, and understandings such as above, below, within, etc. include the present number. If there is a description of first and second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0037] Refer to Figures 1-9 As shown, the present invention provides a technical solution for a fatigue test device for a vehicle frame bushing:

[0038] A fatigue testing device for a vehicle frame bushing, used to test the vehicle frame bushing. The vehicle frame bushing is composed of an inner lining cylinder 7, a buffer assembly 71 and an outer lining cylinder 72. Among them, it should be noted that the buffer assembly 71 is arranged between the inner lining cylinder 7 and the outer lining cylinder 72, generally made of rubber material, which is the prior art and will not be elaborated here. The device specifically includes a base 1. The top surface of the base 1 is connected to a top plate 14 through a support column 13. An inner sliding groove 3 is opened on the bottom surface of the top plate 14. A sliding rod 32 is fixedly connected to the inner side wall of the inner sliding groove 3. A sliding cavity 4 is slidably connected to the sliding rod 32. A spring 31 is sleeved on the sliding rod 32. The top surface of the base 1 is rotatably connected to an outer ring sleeve 5 and an inner ring sleeve 6. The outer ring sleeve 5 and the inner ring sleeve 6 are coaxially arranged. A side waveform ring 52 is arranged on the outer side surface of the outer ring sleeve 5. A plurality of outer tooth blocks 51 are evenly arranged around the central axis on the outer side surface of the outer ring sleeve 5. A top waveform ring 62 is arranged on the top surface of the inner ring sleeve 6. A plurality of inner tooth blocks 61 are evenly arranged around the central axis on the inner side surface of the inner ring sleeve 6. Among them, it should be noted that the bottom end of the left folding rod 44 is attached to the top waveform ring 62, and the bottom side of the right folding rod 45 is attached to the side waveform ring 52.

[0039] It should be noted that the width of the top waveform ring 62 is greater than the maximum fluctuation amplitude of the side waveform ring 52, and the height of the side waveform ring 52 is greater than the maximum fluctuation amplitude of the top waveform ring 62. Such a setting is to prevent the left folding rod 44 from detaching from the top waveform ring 62 and the right folding rod 45 from detaching from the side waveform ring 52. Refer to Figure 4 shown.

[0040] Refer to Figure 4 As shown, a movable rod 43 is vertically slidably connected to the sliding cavity 4. A left folding rod 44 and a right folding rod 45 are arranged on the side wall of the movable rod 43. A snap ring sleeve 46 is arranged at the bottom end of the movable rod 43. The snap ring sleeve 46 is used to snap onto the inner side surface of the inner lining cylinder 7. A vertically telescopic movable table 25 is arranged on the top surface of the base 1. An installation groove 26 is opened on the top surface of the movable table 25. A clamping block 27 is arranged on the inner side wall of the installation groove 26. The clamping block 27 is used to snap onto the outer side surface of the outer lining cylinder 72. Among them, it should be noted that the materials of the snap ring sleeve 46 and the clamping block 27 can be selected as hard rubber. Place the vehicle frame bushing in the installation groove 26, control the movable table 25 to move upward, so that the snap ring sleeve 46 moves towards the inner side surface of the inner lining cylinder 7, thereby forcing the inner side surface of the inner lining cylinder 7 to deform and tightly press on the snap ring sleeve 46. Correspondingly, the clamping block 27 forces the outer side surface of the outer lining cylinder 72 to deform and tightly press on the clamping block 27, thereby clamping the inner lining cylinder 7 and the outer lining cylinder 72. Among them, both the inner lining cylinder 7 and the outer lining cylinder 72 are elastic, so they have elastic potential energy to restore their original shape when deformed, which is the prior art and will not be elaborated here.

[0041] Refer to Figure 1 and Figure 2As shown in the figure, a first one-way motor 2 and a second one-way motor 22 are also provided on the bottom table 1. A first gear 21 is sleeved on the movable end of the first one-way motor 2. The first gear 21 meshes with the outer tooth block 51. A second gear 23 is sleeved on the movable end of the second one-way motor 22. The second gear 23 meshes with the inner tooth block 61. It should be noted that both the first one-way motor 2 and the second one-way motor 22 can only rotate in one direction, and their rotation directions are opposite. It should be noted that the first one-way motor 2 and the second one-way motor 22 are existing technologies, and their internal structures will not be elaborated here.

[0042] The reason for setting the first one-way motor 2 and the second one-way motor 22 in this device is to avoid the mutual influence between the outer ring sleeve 5 and the inner ring sleeve 6. When the inner ring sleeve 6 rotates, as long as the first one-way motor 2 does not start, the outer ring sleeve 5 will not rotate. On the contrary, when the outer ring sleeve 5 rotates, as long as the second one-way motor 22 does not start, the inner ring sleeve 6 will not rotate.

[0043] Refer to Figure 3 As shown in the figure, in an alternative embodiment: a top rotation groove 11 is formed on the top surface of the bottom table 1. The outer ring sleeve 5 and the inner ring sleeve 6 rotate within the top rotation groove 11. There are three support columns 13, all of which are perpendicular to the top surface of the bottom table 1. The top rotation groove 11 is circular, and its center is located at the center of the top surface of the bottom table 1. Refer to Figure 6 As shown in the figure, it should be noted that the outer ring sleeve 5 is rotatably connected to the lower part of the outer side surface of the inner ring sleeve 6.

[0044] Refer to Figure 2 As shown in the figure, it should be noted that the two ends of the spring 31 are respectively fixedly connected to the inner side wall of the inner chute 3 and the outer side surface of the sliding cavity 4.

[0045] Refer to Figure 1 and Figure 2 As shown in the figure, in an alternative embodiment: the inside of the bottom table 1 is hollow. The first one-way motor 2 and the second one-way motor 22 are both arranged on the inner bottom surface of the bottom table 1. The movable ends of the first one-way motor 2 and the second one-way motor 22 pass through the top surface of the bottom table 1. Such a setting makes full use of the internal space of the bottom table 1, makes the structure of this device more compact, reduces the occupied space of this device, and is convenient for use.

[0046] Refer to Figure 3 As shown in the figure, in an alternative embodiment: a central through hole 12 is formed at the center of the top surface of the bottom table 1. An oil cylinder 24 is arranged at the center of the inner bottom surface of the bottom table 1. The movable end of the oil cylinder 24 is fixedly connected to the bottom surface of the movable table 25. It should be noted that the oil cylinder 24 is arranged vertically upward, and the movable end of the oil cylinder 24 and the bottom surface of the movable table 25 can be fixedly connected by glue.

[0047] Refer to Figure 2As shown, in an alternative embodiment: the inside of the sliding cavity 4 is hollow, and the movable rod 43 is vertically and slidably connected to the inner side wall of the sliding cavity 4 and passes through the bottom surface of the sliding cavity 4. Refer to Figure 4 As shown, in an alternative embodiment: a side through hole 42 is formed in the side wall of the sliding cavity 4, and a sliding hole 41 is formed in the top of the sliding cavity 4. The sliding rod 32 is arranged through the sliding hole 41. It should be noted that the arrangement of the side through hole 42 enables the air inside the sliding cavity 4 to enter and exit when the movable rod 43 slides along the inner side wall of the sliding cavity 4, avoiding obstruction to the up and down sliding of the movable rod 43. The vertical cross section of the movable rod 43 is T-shaped, and the inside and bottom surface of the corresponding sliding cavity 4 are matched, so that the movable rod 43 is restricted from detaching from the sliding cavity 4. The side through hole 42 is vertically arranged, and the sliding hole 41 is horizontally arranged.

[0048] Refer to Figure 1 As shown, in an alternative embodiment: a plurality of snap rings 46 are provided, and the diameter decreases from top to bottom. Such an arrangement is to match inner lining cylinders 7 with different inner diameters to improve the adaptability of the device.

[0049] Refer to Figure 4 As shown, in an alternative embodiment: a ball 47 is provided at the bottom end of the left folding rod 44, and the ball 47 can roll freely. The provision of the ball 47 makes the sliding of the bottom of the left folding rod 44 on the top corrugated ring 62 smoother with reduced friction when the left folding rod 44 moves left and right following the movable rod 43, reducing the wear of the bottom of the left folding rod 44. Correspondingly, when the inner ring sleeve 6 rotates, the rolling of the ball 47 reduces the wear of the bottom of the left folding rod 44 sliding on the top corrugated ring 62.

[0050] Now, the working principle of the device is described through its usage process: When using this device to conduct a fatigue test on the vehicle frame bushing, the vehicle frame bushing needs to be briefly introduced first. Refer to Figure 9 As shown, the vehicle frame bushing includes an inner lining cylinder 7, an outer lining cylinder 72, and a buffer assembly 71 located therebetween. The inner lining cylinder 7 in the vehicle frame bushing is directly connected to bolts or axles on the actual vehicle, while the outer lining cylinder 72 is press-fitted and fixed to the vehicle frame or suspension components. The vehicle frame bushing mainly uses the buffer assembly 71 to absorb vibrations and impacts and isolate noises. The fatigue test of the vehicle frame bushing mainly tests the reliability and durability of the buffer assembly 71 during the vertical vibration and left and right swing of the vehicle frame bushing.

[0051] Place the frame bushing in the mounting groove 26, start the oil cylinder 24, so that the movable table 25 moves upward, and then the snap ring sleeve 46 moves inward to the inner side of the inner liner 7, thereby forcing the inner side of the inner liner 7 to deform and press tightly against the snap ring sleeve 46. Correspondingly, the clamping block 27 forces the outer side of the outer liner 72 to deform and press tightly against the clamping block 27. During this process, the movable rod 43 moves upward until it abuts against the inner top surface of the sliding cavity 4.

[0052] After the above process, the rapid press-fitting of the frame bushing is successfully achieved. After that, control the movable table 25 to move downward through the oil cylinder 24. The movable rod 43 moves downward accordingly under the action of the left folding rod 44, the right folding rod 45 and its own gravity until the bottom end of the left folding rod 44 contacts the top corrugated ring 62. At the same time, after pulling the right folding rod 45 outward, stop the movement of the movable table 25 when the bottom end of the right folding rod 45 fits against the side corrugated ring 52. Control the oil cylinder 24 to keep the movable table 25 stationary during the subsequent fatigue test. This is the prior art, and the specific process of controlling the oil cylinder 24 will not be elaborated here.

[0053] When it is necessary to test the reliability and durability of the buffer assembly 71 when facing vibrations in the vertical direction, only need to start the second one-way motor 22. The movable end of the second one-way motor 22 rotates unidirectionally to drive the second gear 23 to rotate. Since the second gear 23 meshes with the internal tooth block 61, the inner ring sleeve 6 starts to rotate. Since the bottom end of the left folding rod 44 fits against the top corrugated ring 62 and the top corrugated ring 62 is corrugated, the left folding rod 44 starts to move up and down, driving the movable rod 43 to move up and down. Through the drive of the inner liner 7, the buffer assembly 71 is subjected to up and down pulling, thus successfully simulating the vibration of the vehicle body in the vertical direction caused by uneven road surfaces. After starting the second one-way motor 22 for a period of time, the frame bushing can be removed to detect the damage of the buffer assembly 71 to obtain an evaluation of its reliability and durability.

[0054] When it is necessary to test the reliability and durability of the buffer assembly 71 when facing left and right swings, only need to start the first one-way motor 2. The movable end of the first one-way motor 2 rotates unidirectionally to drive the first gear 21 to rotate. Since the first gear 21 meshes with the external tooth block 51, the outer ring sleeve 5 starts to rotate. Since the bottom end of the right folding rod 45 fits against the side corrugated ring 52 and the sliding cavity 4, due to the setting of the spring 31, the bottom end of the right folding rod 45 always has a tendency to fit against the side corrugated ring 52, and the side corrugated ring 52 is corrugated, so that the sliding cavity 4 starts to swing left and right. Through the drive of the inner liner 7, the buffer assembly 71 is subjected to left and right swings, thus successfully simulating the force condition of the buffer assembly 71 when the vehicle turns on a flat road surface. After starting the first one-way motor 2 for a period of time, the frame bushing can be removed to detect the damage of the buffer assembly 71 to obtain an evaluation of its reliability and durability.

[0055] When it is necessary to test the reliability and durability of the buffer component 71 when it faces vibrations in the vertical direction and lateral swings at the same time, it is only necessary to start the first one-way motor 2 and the second one-way motor 22 simultaneously. Since the width of the top corrugated ring 62 is greater than the maximum fluctuation amplitude of the side corrugated ring 52, and the height of the side corrugated ring 52 is greater than the maximum fluctuation amplitude of the top corrugated ring 62, it is avoided that the left folding rod 44 disengages from the top corrugated ring 62 and the right folding rod 45 disengages from the side corrugated ring 52. At this time, after starting the first one-way motor 2 and the second one-way motor 22 for a period of time, the frame bushing can be removed, and the damaged condition of the buffer component 71 can be detected to obtain an evaluation of its reliability and durability. It should be noted that detecting the damaged condition of the buffer component 71 is prior art and not the content of the present invention, so it will not be elaborated here.

[0056] Through the settings and common cooperation of the outer ring sleeve 5, the side corrugated ring 52, the inner ring sleeve 6, the top corrugated ring 62, etc., the present device has successfully simulated the buffer component 71 in the frame bushing when facing vibrations in the vertical direction, lateral swings, and the situation where both exist simultaneously, greatly improving the simulation of the fatigue test of the frame bushing. The structure is compactly arranged and has a high degree of automation, greatly improving the efficiency of the fatigue test of the frame bushing, and is suitable for popularization and use in the production process of frame bushings.

[0057] Through the settings and common cooperation of the movable table 25, the sliding cavity 4, the movable rod 43, the left folding rod 44, the right folding rod 45, etc., the present device has not only successfully achieved the rapid press-fitting of the frame bushing on the device, but also cooperated with the outer ring sleeve 5 and the inner ring sleeve 6 to realize the simulated fatigue test of the buffer component 71 in the frame bushing. The structure is exquisitely arranged and has a low manufacturing cost, and is suitable for popularization and application.

[0058] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fatigue test device for a vehicle frame bushing, characterized in that: It includes a bottom platform (1). The top surface of the bottom platform (1) is connected to a top disk (14) through support columns (13). An inner sliding groove (3) is formed on the bottom surface of the top disk (14). A sliding rod (32) is fixedly connected to the inner side wall of the inner sliding groove (3). A sliding cavity (4) is slidably connected to the sliding rod (32). A spring (31) is sleeved on the sliding rod (32). An outer ring sleeve (5) and an inner ring sleeve (6) are rotatably connected to the top surface of the bottom platform (1). The outer ring sleeve (5) and the inner ring sleeve (6) are coaxially arranged. A side corrugated ring (52) is arranged on the outer side surface of the outer ring sleeve (5). A number of outer tooth blocks (51) are uniformly arranged on the outer side surface of the outer ring sleeve (5) around its central axis. A top corrugated ring (62) is arranged on the top surface of the inner ring sleeve (6). A number of inner tooth blocks (61) are uniformly arranged on the inner side surface of the inner ring sleeve (6) around its central axis; The sliding cavity (4) is vertically slidably connected to a movable rod (43). A left folding rod (44) and a right folding rod (45) are arranged on the side wall of the movable rod (43).

2. The fatigue test device for a vehicle frame bushing according to claim 1, characterized in that: This device is used to test a vehicle frame bushing. The vehicle frame bushing is composed of an inner lining cylinder (7), a buffer assembly (71) and an outer lining cylinder (72). A snap ring sleeve (46) is arranged at the bottom end of the movable rod (43). The bottom end of the left folding rod (44) is attached to the top corrugated ring (62). The bottom side of the right folding rod (45) is attached to the side corrugated ring (52). The snap ring sleeve (46) is used to snap onto the inner side surface of the inner lining cylinder (7); A vertically telescopic movable platform (25) is arranged on the top surface of the bottom platform (1). An installation groove (26) is formed on the top surface of the movable platform (25). A clamping block (27) is arranged on the inner side wall of the installation groove (26). The clamping block (27) is used to snap onto the outer side surface of the outer lining cylinder (72); A first one-way motor (2) and a second one-way motor (22) are also arranged on the bottom platform (1). A first gear (21) is sleeved on the movable end of the first one-way motor (2). The first gear (21) meshes with the outer tooth blocks (51). A second gear (23) is sleeved on the movable end of the second one-way motor (22). The second gear (23) meshes with the inner tooth blocks (61); A top rotation groove (11) is formed on the top surface of the bottom platform (1). The outer ring sleeve (5) and the inner ring sleeve (6) rotate within the top rotation groove (11). There are three support columns (13) and they are all perpendicular to the top surface of the bottom platform (1).

3. The fatigue test device for a vehicle frame bushing according to claim 2, wherein: Two ends of the spring (31) are respectively fixedly connected to the inner side wall of the inner sliding groove (3) and the outer side surface of the sliding cavity (4).

4. A frame bushing fatigue test device according to claim 3, characterized in that: The interior of the bottom platform (1) is hollow. The first one-way motor (2) and the second one-way motor (22) are both arranged on the inner bottom surface of the bottom platform (1). The movable ends of the first one-way motor (2) and the second one-way motor (22) pass through the top surface of the bottom platform (1).

5. A fatigue test device for a vehicle frame bushing according to claim 4, characterized in that: A central through hole (12) is formed at the center of the top surface of the bottom platform (1). An oil cylinder (24) is arranged at the center of the inner bottom surface of the bottom platform (1). The movable end of the oil cylinder (24) is fixedly connected to the bottom surface of the movable platform (25).

6. The fatigue test device for a vehicle frame bushing according to claim 5, characterized in that: The interior of the sliding cavity (4) is hollow, and the movable rod (43) is vertically and slidably connected to the inner sidewall of the sliding cavity (4) and penetrates through the bottom surface of the sliding cavity (4).

7. The fatigue test device for a vehicle frame bushing according to claim 6, wherein: A side through-hole (42) is formed in the sidewall of the sliding cavity (4), a sliding hole (41) is formed in the top of the sliding cavity (4), and the sliding rod (32) is arranged through the sliding hole (41).

8. The fatigue test device for a vehicle frame bushing according to claim 7, characterized in that: A plurality of snap rings (46) are provided, and the diameters thereof decrease from top to bottom.

9. The fatigue test device for a vehicle frame bushing according to claim 8, characterized in that: A ball (47) is arranged at the bottom end of the left folding rod (44), and the ball (47) can roll freely.

10. The fatigue test device for a vehicle frame bushing according to claim 9, characterized in that: The width of the top corrugated ring (62) is greater than the maximum fluctuation amplitude of the side corrugated ring (52), and the height of the side corrugated ring (52) is greater than the maximum fluctuation amplitude of the top corrugated ring (62).

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