A rear suspension lower trailing arm outward expansion mechanism

Abstract

The present invention relates to the technical field of automobile production and assembly, and more specifically, to a rear suspension lower longitudinal arm expansion mechanism, comprising a first linear motion mechanism, a second linear motion mechanism, a first support mechanism, a second support mechanism and a drive mechanism, wherein the first support mechanism is connected to the first linear motion mechanism, the second support mechanism is connected to the second linear motion mechanism, and the drive mechanism is connected to the first linear motion mechanism and the second linear motion mechanism to drive the first linear motion mechanism and the second linear motion mechanism to move in opposite directions. No manpower is required to expand the longitudinal arm, and only one worker is required to complete the work, and the surface of the longitudinal arm can be well protected.

Description

Technical Field

[0001] The invention relates to the technical field of automobile production and assembly, and more specifically to an outward expansion mechanism of a rear suspension lower longitudinal arm. Background Art

[0002] Before the multi-link rear suspension assembly is assembled on the chassis assembly line in the final assembly workshop, the assembled rear suspension assembly needs to be transferred from the rear suspension assembly line to the top of the chassis assembly sled platform, and then slowly dropped onto the platform tooling. Since the longitudinal arms of the multi-link rear suspension assembly are slightly retracted in the assembly state, and need to be kept open to a certain position during assembly, there is a set of rear suspension assembly longitudinal arm support expansion mechanism on the assembly sled to maintain the longitudinal arm posture. Therefore, in the process of the rear suspension assembly slowly falling onto the platform tooling, the rear longitudinal arm will inevitably rub against the platform support expansion, causing external damage to the rear longitudinal arm and affecting the drop efficiency.

[0003] The existing technical solution is to use a very simple fixed U-shaped slot, in which a nylon sheet with a guide is embedded, and the nylon is fastened to the U-shaped slot by bolts to play an appropriate protective role. The existing U-shaped slot is fixedly set. When the lower longitudinal arm is expanded, two workers are required to manually pull the longitudinal arm at both ends to expand it and then insert it into the U-shaped slot to maintain the expanded state of the longitudinal arm. The longitudinal arm support outward expansion mechanism of the existing solution is fixed, and the longitudinal arm relies on the deadweight of the rear suspension assembly and the inertia force when the parts are dropped to clamp the longitudinal arm into the longitudinal arm support outward expansion mechanism, so scratches are inevitable during the insertion process; the longitudinal arm will naturally retract slightly after the subassembly is completed, and it is necessary to overcome greater resistance to open the longitudinal arm. Therefore, when the longitudinal arm is clamped into the fixed longitudinal arm support outward expansion mechanism, it is often necessary to manually apply external force to press down, and the operator fatigue intensity is relatively high; the width of the rear suspension assembly itself is about 1800mm, and the car sled lies across the middle of the assembly. The operator can only stand on one side to drop the parts. When the rear suspension assembly is stuck during the drop, an operator must be deployed on each side to adjust the posture of the rear suspension assembly and apply pressure. A total of two employees are required; every time the rear suspension assembly is dropped, it is inevitable that it will be scratched against the fixed longitudinal arm support outward expansion mechanism. Not only are the parts easily damaged, but the tooling itself is also easily damaged and fails, resulting in frequent maintenance.

[0004] The main problem with the existing technology is that it is necessary to use manual labor to fix the longitudinal arm, which makes it difficult to install, extremely labor-intensive, and difficult to operate. It often requires two people to complete the work. Secondly, the existing U-shaped slot is easy to damage the surface of the longitudinal arm when fixing the longitudinal arm. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a rear suspension lower longitudinal arm expansion mechanism, which does not require manpower to expand the longitudinal arm, only requires one worker to complete the work, and can well protect the surface of the longitudinal arm.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a rear suspension lower longitudinal arm outward expansion mechanism, including a first linear motion mechanism, a second linear motion mechanism, a first supporting mechanism, a second supporting mechanism and a driving mechanism, the first supporting mechanism is connected to the first linear motion mechanism, the second supporting mechanism is connected to the second linear motion mechanism, and the driving mechanism is connected to the first linear motion mechanism and the second linear motion mechanism to drive the first linear motion mechanism and the second linear motion mechanism to move in opposite directions.

[0007] By using this device, before the longitudinal arm is expanded outward, the first linear motion mechanism and the second linear motion mechanism are controlled by the driving mechanism, so that the positions of the first support mechanism and the second support mechanism are adapted to the placement position of the longitudinal arm, the longitudinal arm is placed on the first support mechanism and the second support mechanism, and the first linear motion mechanism and the second linear motion mechanism are controlled by the driving mechanism to move in opposite directions, so that the first support mechanism and the second support mechanism are moved away from each other, so that the first support mechanism and the second support mechanism exert an outward force on the longitudinal arm to achieve expansion, so as to achieve the effect of keeping the longitudinal arm in an open posture. After the arm expansion work is completed, it is only necessary to repeat the above, and use the driving mechanism to control the first support mechanism and the second support mechanism to move closer to unload the parts. By using this device, there is no need to use manpower to expand the longitudinal arm and then fix it. It is only necessary to control the driving mechanism after the longitudinal arm is placed and fixed to complete the expansion of the longitudinal arm. One staff member can complete the required work, saving time and effort, reducing the fatigue intensity of the staff, and at the same time, it can also avoid problems such as damage to the longitudinal arm due to insufficient human operation, which can improve production efficiency.

[0008] Furthermore, the first linear motion mechanism includes a first linear guide and a first slider, the first slider is slidably disposed on the first linear guide, the first support mechanism is connected to the first slider, and the second linear motion mechanism includes a second linear guide and a second slider, the second slider is slidably disposed on the second linear guide, and the second support mechanism is connected to the second slider. The first linear guide and the second linear guide are in the same linear direction, and the first slider and the second slider are driven and controlled by the driving mechanism, so that the first slider and the second slider move in opposite directions, thereby driving the movement of the first support mechanism and the second support mechanism.

[0009] Further, the driving mechanism includes a central rod connecting rod, a first side tie rod, a second side tie rod and a control mechanism. The central part of the central rod connecting rod is hinged and fixed, the first side tie rod and the second side tie rod are respectively hinged to the two ends of the central rod connecting rod, the other end of the first side tie rod is hinged to the first slider, the other end of the second side tie rod is hinged to the second slider, and the control mechanism is connected to the central rod connecting rod to control the rotation of the central rod connecting rod. When controlling the movement of the first slider and the second slider, the movement of the central rod connecting rod is controlled by using the control mechanism, so that the central rod connecting rod rotates around its rotation center, and the first side tie rod and the second side tie rod are driven to move during the rotation, the first side tie rod pulls the first slider to slide, and the second side tie rod pulls the second slider to slide, thereby controlling the direction of the first slider and the second slider to move. The movement of the central rod connecting rod is also involved in the movement of the first side tie rod and the second side tie rod. Through the mechanism, the first slider and the second slider can be well controlled synchronously at the same time, so that the longitudinal arm can be expanded synchronously when it is expanded, and the operation is more convenient. One person can complete the expansion of the longitudinal arms on both sides. In addition, the center rod connecting rod, the first side pull rod and the second side rod form a connecting rod movement mechanism, which can realize labor-saving operation and reduce the fatigue intensity of the operator through the lever principle.

[0010] Furthermore, the control mechanism is a manual operating mechanism, which includes an operating arm connected to the center rod connecting rod. By pulling the operating arm manually, the operating arm drives the center rod connecting rod to rotate, thereby controlling the movement of the first support mechanism and the second support mechanism.

[0011] Furthermore, the manual operating mechanism further comprises a fixed arm and a spring pin, the fixed arm comprises a connecting arm and a bent arm, the connecting arm is connected to the first side pull rod or the second side pull rod, the bent arm is connected to the connecting arm, the bent arm is provided with a plurality of clamping holes, the spring pin is connected to the end of the operating arm, and the spring pin can be clamped in the clamping hole. When the outward expansion is performed, the operating arm rotates around the rotation center of the central rod connecting rod, and the end of the operating arm moves along the direction of the bent arm. When the operating arm is controlled to move the first support mechanism and the second support mechanism to a suitable position, the spring pin is inserted into the clamping hole to fix the position of the operating arm, thereby maintaining the position of the first support mechanism and the second support mechanism, so as to achieve the longitudinal arm maintaining the outward expansion posture without the need for manpower to maintain.

[0012] Furthermore, the control mechanism is an electric operating mechanism, and the electric operating mechanism is a servo motor, and the output shaft of the servo motor is connected to the center rod connecting rod to drive the center rod connecting rod to rotate. The servo motor can realize forward and reverse rotation, thereby realizing the control of the forward and reverse rotation of the center rod connecting rod, thereby realizing the control of the first support mechanism and the second support mechanism to move closer to or away from each other.

[0013] Furthermore, the driving mechanism includes a first linear motor and a second linear motor, wherein the first linear motor is connected to the first slider, and the second linear motor is connected to the second slider. The first linear motor controls the movement of the first slider, and the second linear motor controls the movement of the second slider, thereby driving the movement of the first support mechanism and the second support mechanism.

[0014] Furthermore, the first support mechanism includes a first support block, and the second support mechanism includes a second support block. The first support block and the second support block have the same structure and are both L-shaped blocks, and the openings of the first support block and the second support block face opposite directions. The setting of the L-shaped block allows the longitudinal arm to be placed directly on the L-shaped block. When the part is dropped, the longitudinal arm falls on the L-shaped block without the need to fully align the position for clamping. After the placement is completed, the longitudinal arms on both sides can be expanded outwards through the L-shaped block by controlling the first support mechanism and the second support mechanism to move in reverse. The design of the L-shaped block can reduce the scratches on the longitudinal arm when the part is dropped, which can not only avoid damage to the longitudinal arm, but also reduce the loss of the outward expansion device, reduce the maintenance of the outward expansion device, and reduce the defective rate of the workpiece.

[0015] Furthermore, the first support mechanism further comprises a first machine base, a first buffer piston, a third linear guide and a third slider, wherein the third linear guide is connected to the first machine base, the third slider is slidably connected to the third linear guide, the first support block is connected to the third slider, one end of the first buffer piston is connected to the third slider, and the other end is connected to the first machine base;

[0016] The second supporting mechanism also includes a second machine base, a second buffer piston, a fourth linear guide and a fourth slider. The fourth linear guide is connected to the second machine base, the fourth slider is slidably connected to the fourth linear guide, the second supporting block is connected to the fourth slider, and two ends of the second buffer piston are connected to the fourth slider, and the other two ends are connected to the second machine base.

[0017] When the longitudinal arm drops the workpiece onto the first support block and the second support block, the third slider and the fourth slider can move downward under the action of gravity. In order to cushion the impact force when the longitudinal arm drops the workpiece, the first buffer piston and the second buffer piston can well cushion the impact force of the drop, weaken the impact force and protect the workpiece.

[0018] Furthermore, the surfaces of the first support block and the second support block are rounded to prevent external damage to the parts.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. This device does not require manpower to expand the longitudinal arm and maintain the expanded posture. Only one worker is needed to complete the work of expanding the longitudinal arm, which saves time and effort, reduces the fatigue intensity of the workers, and can greatly improve the working efficiency;

[0021] 2. This device can protect the longitudinal arm very well. It will not cause damage to the longitudinal arm and the device during the expansion work. It can well reduce the defective rate of the workpiece and protect the device very well without frequent maintenance.

[0022] 3. The manual operating mechanism of this device adopts the lever principle to achieve labor-saving operation and reduce operator fatigue. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 for Figure 1 Schematic diagram of the back structure;

[0025] Figure 3 is a schematic structural diagram of a first supporting mechanism in one embodiment of the present invention;

[0026] Figure 4 for Figure 3 Schematic diagram of the back structure;

[0027] Figure 5 is a schematic structural diagram of a second supporting mechanism in one embodiment of the present invention;

[0028] Figure 6 for Figure 5 Schematic diagram of the back structure;

[0029] Figure 7 It is a schematic diagram of the motion state of the present invention. DETAILED DESCRIPTION

[0030] The present invention is further described below in conjunction with specific implementation methods. The accompanying drawings are only used for exemplary descriptions and are only schematic diagrams, not actual drawings, and cannot be understood as limiting this patent; in order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted.

[0031] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it 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 direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0032] Embodiment 1:

[0033] like Figure 1 , 2 As shown, a rear suspension lower longitudinal arm outward expansion mechanism includes a first linear motion mechanism 30, a second linear motion mechanism 40, a first support mechanism 10, a second support mechanism 20 and a driving mechanism. The first support mechanism 10 is connected to the first linear motion mechanism 30, the second support mechanism 20 is connected to the second linear motion mechanism 40, and the driving mechanism is connected to the first linear motion mechanism 30 and the second linear motion mechanism 40 to drive the first linear motion mechanism 30 and the second linear motion mechanism 40 to move in opposite directions.

[0034] Specifically, the first linear mechanism includes a first linear guide 301 and a first slider 302, the first slider 302 is slidably disposed on the first linear guide 301, the first support mechanism 10 is connected to the first slider 302, and the second linear motion mechanism 40 includes a second linear guide 401 and a second slider 402, the second slider 402 is slidably disposed on the second linear guide 401, and the second support mechanism 20 is connected to the second slider 402. The first linear guide 301 and the second linear guide 401 are in the same linear direction, and the first slider 302 and the second slider 402 are driven and controlled by the driving mechanism, so that the first slider 302 and the second slider 402 move in opposite directions, thereby driving the movement of the first support mechanism 10 and the second support mechanism 20.

[0035] In this embodiment, the driving mechanism used is a manual driving mechanism, including a center rod connecting rod 501, a first side tie rod 502, a second side tie rod 503 and a manual control mechanism, wherein the center rod connecting rod 501 is a central symmetrical structure, the center of which is fixed by a bearing shaft, and the center rod connecting rod 501 can rotate around the shaft. One end of the first side tie rod 502 is hinged to the center rod connecting rod 501, and the other end is hinged to the first slider 302, one end of the second side tie rod 503 is hinged to the center rod connecting rod 501, and the other end is hinged to the second slider 402. Specifically, an articulated seat is extended on the side of the first slider 302 and the second slider 402, and the first side tie rod 502 and the second side tie rod 503 are respectively hinged to the articulated seat provided on the first slider 302 and the articulated seat provided on the second slider 402. In particular, in order to avoid motion interference, the bottom surfaces of the first side tie rod 502 and the second side tie rod 503 are both higher than the upper surfaces of the first slider 302 and the second slider 402. When moving, the first side tie rod 502 and the second side tie rod 503 can be prevented from colliding with the first slider 302 and the second slider 402 to cause motion interference and affect the motion action. The center rod connecting rod 501 rotates around its rotation center, and when rotating, it drives the first side tie rod 502 and the second side tie rod 503 to move. The first side tie rod 502 pulls the first slider 302 to slide, and the second side tie rod 503 pulls the second slider 402 to slide, thereby controlling the direction of movement of the first slider 302 and the second slider 402. The movement of the center rod link 501 simultaneously involves the movement of the first side tie rod 502 and the second side tie rod 503. Through this mechanism, the first slider 302 and the second slider 402 can be well controlled synchronously, so that the longitudinal arm can be expanded synchronously during the expansion work, and the operation is more convenient. One person can complete the expansion work of the longitudinal arms on both sides. In addition, the center rod link 501, the first side tie rod 502 and the second side rod form a connecting rod movement mechanism, which can realize labor-saving operation and reduce the fatigue intensity of the operator through the lever principle.

[0036] In addition, in this embodiment, the manual driving mechanism is connected to the central rod connecting rod 501, and is used to drive the central rod connecting rod 501 to rotate. Specifically, the manual driving mechanism includes an operating arm 601, a fixed arm and a spring pin 604. One end of the operating arm 601 is fixedly connected to the central rod connecting rod 501, and the other end is provided with a spring pin 604. The fixed arm includes a connecting arm 602 and a bent arm 603. The connecting arm 602 is connected to the first side pull rod 502 or the second side pull rod 503. The bent arm 603 is connected to the connecting arm 602. The bent arm 603 is provided with a plurality of clamping holes 605. The spring pin 604 is connected to the end of the operating arm 601, and the spring pin 604 can be clamped in the clamping hole 605. The bending radius of the bent arm 603 is the same as the movement trajectory of the spring pin 604. When expanding outward, the operating arm 601 rotates around the rotation center of the central rod connecting rod 501, and the end of the operating arm 601 moves along the direction of the bent arm 603. When the operating arm 601 is controlled to move the first support mechanism 10 and the second support mechanism 20 to a suitable position, the spring pin 604 is inserted into the card hole 605 to fix the position of the operating arm 601, thereby maintaining the position of the first support mechanism 10 and the second support mechanism 20, and realizing that the longitudinal arm maintains the outward expansion posture without human power.

[0037] In this embodiment, if Figure 3 , 5 As shown, the first support mechanism 10 includes a first support block 105, and the second support mechanism 20 includes a second support block 205. The first support block 105 and the second support block 205 have the same structure, both are L-shaped blocks, and the openings of the first support block 105 and the second support block 205 face opposite directions. The setting of the L-shaped block allows the longitudinal arm to be placed directly on the L-shaped block. When the part is dropped, the longitudinal arm falls on the L-shaped block without the need to fully align the position for clamping. After the placement is completed, the longitudinal arms on both sides can be expanded outwards through the L-shaped block by controlling the first support mechanism 10 and the second support mechanism 20 to move in the opposite direction. The design of the L-shaped block can reduce the scratches on the longitudinal arm when the part is dropped, which can not only avoid damage to the longitudinal arm, but also reduce the loss of the outward expansion device, reduce the maintenance of the outward expansion device, and reduce the defective rate of the workpiece.

[0038] In this device, if Figure 7As shown, before the longitudinal arm is expanded, the central rod link 501 is rotated by pulling the operating arm 601, thereby driving the first side pull rod 502 and the second side pull rod 503 to move, and pulling the first slider 302 and the second slider 402 to make the first support block 105 and the second support block 205 move close to each other, so that their positions are adapted to the positions on both sides of the longitudinal arm, and the longitudinal arm is dropped onto the first support block 105 and the second support block 205, so that the first support block 105 and the second support block 205 support the longitudinal arm. After the dropping is completed, the operating arm 601 is pushed to control the first support block 105 and the second support block 205 to move away from each other, and the first support block 105 and the second support block 205 apply an outward force to the longitudinal arm to achieve outward expansion, so as to achieve the effect of keeping the longitudinal arm in an open posture. When the arm expansion work is completed, it is only necessary to repeat the above to make the first support block 105 and the second support block 205 close to each other, and the parts can be unloaded. This device does not require manpower to expand the longitudinal arm and then fix it. It only needs to place and fix the longitudinal arm and then control the drive mechanism to complete the expansion of the longitudinal arm. One worker can complete the required work, saving time and effort, reducing the fatigue intensity of the worker, and also avoiding problems such as damage to the longitudinal arm due to insufficient human operation, which can improve production efficiency. In addition, this device can reduce the scratches on the longitudinal arm when dropping parts, which can not only avoid damage to the longitudinal arm, but also reduce the loss of the expansion device, reduce the maintenance of the expansion device, and reduce the defective rate of workpieces.

[0039] Embodiment 2:

[0040] This embodiment is similar to Embodiment 1, except that, in this embodiment, Figure 3 , 4 As shown, the first support mechanism 10 also includes a first base 101, a first buffer piston 102, a third linear guide 103 and a third slider 104, the third linear guide 103 is connected to the first base 101, the third slider 104 is slidably connected to the third linear guide 103, the first support block 105 is connected to the third slider 104, one end of the first buffer piston 102 is connected to the third slider 104, and the other end is connected to the first base 101;

[0041] like Figure 5 , 6 As shown, the second support mechanism 20 also includes a second machine base 201, a second buffer piston 202, a fourth linear guide 203 and a fourth slider 204. The fourth linear guide 203 is connected to the second machine base 201, the fourth slider 204 is slidably connected to the fourth linear guide 203, the second support block 205 is connected to the fourth slider 204, two ends of the second buffer piston 202 are connected to the fourth slider 204, and the other two ends are connected to the second machine base 201.

[0042] When the longitudinal arm drops onto the first support block 105 and the second support block 205, the third slider 104 and the fourth slider 204 can move downward under the action of gravity. In order to buffer the impact force when the longitudinal arm drops, the first buffer piston 102 and the second buffer piston 202 can effectively buffer the impact force of the drop, weaken the impact force, and protect the workpiece.

[0043] In addition, the surfaces of the first supporting block 105 and the second supporting block 205 are rounded to prevent external damage to the parts.

[0044] Embodiment 3:

[0045] This embodiment is similar to embodiment 1 or 2, except that, in this embodiment, the control mechanism is an electric operating mechanism, and the electric operating mechanism is a servo motor, and the output shaft of the servo motor is connected to the center rod connecting rod 501 to drive the center rod connecting rod 501 to rotate. The servo motor can realize forward and reverse rotation, thereby controlling the forward and reverse rotation of the center rod connecting rod 501, thereby controlling the first support mechanism 10 and the second support mechanism 20 to move closer to or away from each other.

[0046] Embodiment 4:

[0047] This embodiment is similar to Embodiments 1-3, except that, in this embodiment, the driving mechanism includes a first linear motor and a second linear motor, the first linear motor is connected to the first slider 302, and the second linear motor is connected to the second slider 402. The first linear motor controls the movement of the first slider 302, and the second linear motor controls the movement of the second slider 402, thereby driving the movement of the first support mechanism 10 and the second support mechanism 20.

[0048] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A rear suspension lower longitudinal arm expansion mechanism, characterized in that: The invention comprises a first linear motion mechanism (30), a second linear motion mechanism (40), a first supporting mechanism (10), a second supporting mechanism (20) and a driving mechanism, wherein the first supporting mechanism (10) is connected to the first linear motion mechanism (30), and the second supporting mechanism (20) is connected to the second linear motion mechanism (40); the first linear motion mechanism (30) comprises a first linear guide rail (301) and a first slider (302), the first slider (302) is slidably arranged on the first linear guide rail (301), the first supporting mechanism (10) is connected to the first slider (302), the second linear motion mechanism (40) comprises a second linear guide rail (401) and a second slider (402), the second slider (402) is slidably arranged on the second linear guide rail (401), and the second supporting mechanism (20) is connected to the second slider (402); the driving mechanism is connected to the first slider (302) and the second slider (402) to drive the first slider (302) and the second slider (402) to move in opposite directions; The driving mechanism comprises a central rod connecting rod (501), a first side pull rod (502), a second side pull rod (503) and a control mechanism. The central rod connecting rod (501) is hinged and fixed at the center. The first side pull rod (502) and the second side pull rod (503) are respectively hinged to the two ends of the central rod connecting rod (501). The other end of the first side pull rod (502) is hinged to the first slider (302), and the other end of the second side pull rod (503) is hinged to the second slider (402). The control mechanism is connected to the central rod connecting rod (501) to control the rotation of the central rod connecting rod (501). The control mechanism is a manual operation mechanism. The manual operating mechanism comprises an operating arm (601), wherein the operating arm (601) is connected to the center rod connecting rod (501); the manual operating mechanism also comprises a fixed arm and a spring pin (604), wherein the fixed arm comprises a connecting arm (602) and a bent arm (603), wherein the connecting arm (602) is connected to the first side pull rod (502) or the second side pull rod (503), wherein the bent arm (603) is connected to the connecting arm (602), wherein a plurality of clamping holes (605) are provided on the bent arm (603), wherein the spring pin (604) is connected to the end of the operating arm (601), and wherein the spring pin (604) can be clamped in the clamping hole (605).

2. The rear suspension lower longitudinal arm outward expansion mechanism according to claim 1, characterized in that: The first support mechanism (10) comprises a first support block (105), and the second support mechanism (20) comprises a second support block (205). The first support block (105) and the second support block (205) have the same structure and are both L-shaped blocks. The openings of the first support block (105) and the second support block (205) face in opposite directions.

3. The rear suspension lower longitudinal arm outward expansion mechanism according to claim 2, characterized in that: The first support mechanism (10) further comprises a first machine base (101), a first buffer piston (102), a third linear guide rail (103) and a third slider (104); the third linear guide rail (103) is connected to the first machine base (101); the third slider (104) is slidably connected to the third linear guide rail (103); the first support block (105) is connected to the third slider (104); one end of the first buffer piston (102) is connected to the third slider (104) and the other end is connected to the first machine base (101); The second support mechanism (20) further comprises a second machine base (201), a second buffer piston (202), a fourth linear guide rail (203) and a fourth slider (204); the fourth linear guide rail (203) is connected to the second machine base (201); the fourth slider (204) is slidably connected to the fourth linear guide rail (203); the second support block (205) is connected to the fourth slider (204); one end of the second buffer piston (202) is connected to the fourth slider (204), and the other end is connected to the second machine base (201).

4. A rear suspension lower longitudinal arm outward expansion mechanism according to claim 2 or 3, characterized in that: The surfaces of the first support block (105) and the second support block (205) are rounded.

Images