A leaf spring group suspension system with a protection mechanism

Abstract

The present invention relates to a leaf spring assembly suspension system with a protective mechanism, comprising: a vehicle frame, equipped with a stop mechanism having a first connecting member; a leaf spring assembly mounted on the vehicle frame and positioned below the vehicle frame, and equipped with a limiting mechanism having a second connecting member; when the leaf spring assembly breaks, the leaf spring assembly drives the second connecting member to connect with the first connecting member, and the first connecting member prevents the leaf spring assembly from further moving. By installing matching stop mechanisms and limiting mechanisms on the vehicle frame and the leaf spring assembly, if the leaf spring assembly breaks during driving, the leaf spring assembly moves upward, driving the second connecting member upward, ultimately connecting the second connecting member to the first connecting member, thereby ensuring the connection between the leaf spring assembly and the frame at the moment of breakage, thereby ensuring guidance along the X-direction of the vehicle coordinate system.

Description

Technical Field

[0001] The present invention relates to the technical field of leaf spring suspensions, in particular to a leaf spring group suspension system with a protection mechanism. Background Art

[0002] The leaf spring suspension system is a connecting structural system used between the vehicle body, frame and wheels. It serves as a guide, damping element and elastic element and is widely used in commercial vehicles and buses.

[0003] Currently, the most common leaf spring suspension system uses a leaf spring assembly connected to the vehicle frame via a lug and a fixed end. Ground force on the wheels is transmitted through the axle to the leaf spring assembly, which then directs the force to the frame via the fixed and lug brackets. As a result, the leaf spring assembly moves up and down during the reciprocating force, impacting the frame and causing noise that degrades the driving experience. In more serious cases, the leaf spring assembly can break, reducing vehicle safety. Therefore, existing leaf spring suspension systems incorporate a buffer structure to mitigate impact and improve vehicle comfort.

[0004] In the related art, a new suspension limit buffer block arrangement structure is proposed, which solves the brake deviation problem caused by different deformation of the leaf spring group by arranging a second limit buffer block in the peak area of ​​the leaf spring deformation for buffering.

[0005] Although buffer structures are widely used in leaf spring suspension systems, cushioning impacts and improving vehicle ride and safety, they cannot guarantee emergency connection in the event of a leaf spring break. More seriously, fatigue fractures can occur during frequent reciprocating stresses, leaving the leaf spring assembly connected to the vehicle frame solely at the fixed end or the lug end. This only provides a certain degree of guidance in the Y direction (lateral) within the vehicle coordinate system, while losing its X direction (longitudinal) guidance. This degrades vehicle handling stability and safety in the event of a break, leading to accidents. Clearly, this is a problem that cannot be addressed solely with the buffer structure of existing leaf spring suspension systems.

[0006] Therefore, it is necessary to propose a leaf spring group suspension system with a protection mechanism to solve the above problems. Summary of the Invention

[0007] An embodiment of the present invention provides a leaf spring group suspension system with a protection mechanism to solve the problem in related technologies that leaf spring groups may suffer fatigue fracture, resulting in decreased vehicle handling stability, greatly reduced safety, and leading to accidents.

[0008] In a first aspect, a leaf spring group suspension system with a protective mechanism is provided, comprising: a vehicle frame, which is equipped with a stopping mechanism, the stopping mechanism having a first connecting member; a leaf spring group, which is mounted on and located below the vehicle frame, the leaf spring group being equipped with a limiting mechanism, the limiting mechanism having a second connecting member; when the leaf spring group breaks, the leaf spring group can drive the second connecting member to connect with the first connecting member, and the first connecting member can prevent the leaf spring group from continuing to move.

[0009] In some embodiments, the first connecting member includes a rubber column, which extends from the bottom of the frame toward the direction close to the second connecting member; the second connecting member includes a limit block and a limit hole provided on the limit block, and the leaf spring group can drive the limit block to move toward the direction close to the rubber column, so that the rubber column is inserted into the limit hole, and the limit hole can limit the rubber column from being pulled out.

[0010] In some embodiments, the rubber column is provided with a through hole extending along the length direction, a fixing stud is passed through the through hole, and one end of the fixing stud is fixed to the vehicle frame via a nut.

[0011] In some embodiments, one end of the fixing stud away from the nut extends to the outside of the rubber column.

[0012] In some embodiments, a tapered guide portion is provided at one end of the fixing stud close to the second connecting member, and a cross-sectional dimension of the guide portion gradually decreases toward the second connecting member.

[0013] In some embodiments, a first boss is fixed to the outer side of the fixing stud, and the cross-sectional dimension of the first boss is larger than the inner diameter of the through hole; a first groove is provided in the rubber column, and the first boss is fixed to the first groove.

[0014] In some embodiments, a second boss is fixed to the outer side of the fixing stud; the stopping mechanism further includes a pad fixed to the frame, the fixing stud passes through the pad, the pad is provided with a second groove, and the second boss is fixed to the second groove.

[0015] In some embodiments, a groove ring is provided on the outer side of the rubber column, the groove extends around the circumference of the rubber column, and the inner wall of the groove ring extends obliquely from top to bottom toward the axis of the rubber column.

[0016] In some embodiments, the cross-section of the rubber column is conical, and the cross-sectional size gradually decreases from the end close to the frame to the end close to the second connecting member; multiple groove rings are provided along the axial direction of the rubber column, and the cross-sectional size of each groove ring decreases as the cross-sectional size of the rubber column decreases.

[0017] In some embodiments, a tapered guide hole is provided on the inner wall of the limiting hole, and the inner radial direction of the guide hole gradually increases toward the rubber column.

[0018] The beneficial effects brought about by the technical solution provided by the present invention include:

[0019] An embodiment of the present invention provides a leaf spring group suspension system with a protection mechanism. By installing matching stopping mechanisms and limiting mechanisms on the vehicle frame and the leaf spring group, if the leaf spring group breaks during driving, the leaf spring group will move upward, driving the second connecting member to move upward, and finally connecting the second connecting member to the first connecting member, thereby ensuring the connection between the leaf spring group and the frame at the moment of breakage, thereby ensuring the guiding effect along the X-direction of the vehicle coordinate system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 A schematic diagram of the overall structure of a leaf spring group suspension system with a protection mechanism provided by an embodiment of the present invention;

[0022] Figure 2 A schematic diagram of the partial structure of a leaf spring group suspension system with a protection mechanism provided by an embodiment of the present invention;

[0023] Figure 3 A schematic diagram of a partial three-dimensional structure of a leaf spring group suspension system with a protection mechanism provided by an embodiment of the present invention;

[0024] Figure 4 A schematic structural diagram of a rubber column of a leaf spring group suspension system with a protection mechanism provided by an embodiment of the present invention;

[0025] Figure 5 A schematic structural diagram of a fixing stud of a leaf spring group suspension system with a protection mechanism provided by an embodiment of the present invention.

[0026] Numbers in the figure:

[0027] 1. Stop mechanism; 11. First connecting member; 111. Rubber column; 112. Fixing stud; 113. Grooved ring; 114. Guide portion; 115. First boss; 116. First groove; 117. Second boss; 12. Nut; 13. Backing plate; 131. Second groove;

[0028] 2. Frame;

[0029] 3. Limiting mechanism; 31. Second connecting member; 311. Limiting block; 312. Limiting hole; 313. Guide hole;

[0030] 4. Leaf spring assembly. DETAILED DESCRIPTION

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0032] An embodiment of the present invention provides a leaf spring group suspension system with a protection mechanism, which can solve the problem in related technologies that the leaf spring group may suffer fatigue fracture, resulting in decreased vehicle handling stability, greatly reduced safety, and leading to accidents.

[0033] See also Figure 1 As shown, a leaf spring group suspension system with a protection mechanism is provided in an embodiment of the present invention, which may include: a frame 2, which is equipped with a stopping mechanism 1, and the stopping mechanism 1 has a first connecting member 11; a leaf spring group 4, which is installed on the frame 2 and located below the frame 2, and the leaf spring group 4 is equipped with a limiting mechanism 3, and the limiting mechanism 3 has a second connecting member 31; when the leaf spring group 4 breaks, the leaf spring group 4 can drive the second connecting member 31 to connect with the first connecting member 11, and the first connecting member 11 can prevent the leaf spring group 4 from continuing to move.

[0034] In this embodiment, the stopping mechanism 1 is located between the frame 2 and the leaf spring group 4, the limiting mechanism 3 is located between the frame 2 and the leaf spring group 4, the stopping mechanism 1 is located above the limiting mechanism 3, the first connecting member 11 and the second connecting member 31 can be connected to each other, when the leaf spring group 4 breaks, the leaf spring group 4 moves up, driving the second connecting member 31 to connect with the first connecting member 11, and the first connecting member 11 will restrict the second connecting member 31, preventing it from returning to its original position, thereby connecting the leaf spring group 4 to the frame 2, so that the bridge and the frame 2 maintain a positioned connection, limiting the longitudinal displacement of the steering bridge, and improving safety.

[0035] See also Figure 2 and Figure 3 As shown, in some optional embodiments, the first connecting member 11 may include a rubber column 111, which extends from the bottom of the frame 2 toward the direction close to the second connecting member 31; the second connecting member 31 includes a limit block 311 and a limit hole 312 provided on the limit block 311, and the leaf spring group 4 can drive the limit block 311 to move toward the direction close to the rubber column 111, so that the rubber column 111 is inserted into the limit hole 312, and the limit hole 312 can limit the rubber column 111 from being pulled out.

[0036] In this embodiment, one end of the rubber column 111 is fixed to the vehicle frame 2, and the other end extends downward. A limit block 311 is located directly below the rubber column 111. One end of the limit block 311 can be fixed to the leaf spring assembly 4, and the other end is provided with a table with a limit hole 312. The cross-sectional dimensions of the rubber column 111 are slightly larger than the cross-sectional dimensions of the limit hole 312. When the leaf spring assembly 4 breaks and moves to the limit position on the leaf spring assembly 4, the rubber column 111 connects with the limit hole 312. The surface friction of the rubber column 111 is large, generating a certain engagement force. The elasticity of the leaf spring assembly 4 after breaking is insufficient to pull the rubber column 111 out of the limit hole 312, thereby maintaining the leaf spring assembly 4 in a state of connection with the vehicle frame 2. This limits the longitudinal displacement of the steering axle, improves safety, and has a simple structure and is easy to use. In other embodiments, the first connecting member 11 and the second connecting member 31 may also adopt a detachable connection structure such as a snap connection or a hinge connection.

[0037] Specifically, when the steering axle bounces within the normal design range, the leaf spring group limit block 311 will not contact the rubber column 111; if the actual road condition is too bumpy, resulting in an excessively large movement stroke of the leaf spring group 4, as long as the leaf spring group 4 does not break, the limit block 311 can still be driven normally out of contact with the rubber column 111 by the elastic force of the leaf spring group 4 after contacting the rubber column 111, without affecting the normal driving of the vehicle, and the limit block 311 still plays a limiting role; if the leaf spring group 4 breaks completely during driving, the leaf spring group 4 will move up, driving the limit block 311 to move upward, and finally causing the limit block 311 to be stuck with the rubber column 111 through the limit hole 312, thereby ensuring the connection between the leaf spring group 4 and the frame 2 at the moment of breakage, thereby ensuring the guiding role along the X direction of the vehicle coordinate system.

[0038] The second connecting member 31 in this embodiment may include a limit block 311 and a limit hole 312 provided on the limit block 311. The position of the limit hole 312 satisfies the following rules: when the leaf spring group 4 is in the upper jump limit position, the rubber column 111 can pass through (normal working conditions) / be stuck (the leaf spring group is broken) in the limit block hole. The rubber column 111 needs to meet the following rules: its engagement force with the limit hole 312 is less than the restoring force under normal working conditions when the leaf spring group 4 is not broken, and is greater than the leaf spring group 4 at the moment of breaking. It is only connected by the broken leaf spring group 4 that has lost its elastic force. The disengagement force caused by the road conditions ensures that no connection occurs under normal working conditions, and connection occurs under broken conditions.

[0039] See also Figure 2 and Figure 3 As shown, in some embodiments, the rubber column 111 may be provided with a through hole extending along the length direction, and a fixing stud 112 may be passed through the through hole, and one end of the fixing stud 112 is fixed to the frame 2 through a nut 12.

[0040] In this embodiment, one end of the fixing stud 112 passes through the vehicle frame 2 and is fixed to the vehicle frame 2 by a nut 12. The interior of the rubber column 111 is provided with a cylindrical through hole along the axial direction. The fixing stud 112 is inserted into the through hole. The rubber column 111 is fixed to the vehicle frame 2 by the fixing stud 112, which imparts rigidity to the interior of the elastic rubber column 111. The fixing stud 112 ensures the bending strength of the rubber column 111. In other words, it ensures that when the leaf spring assembly 4 does not break, the rubber column 111 will not bend when the leaf spring assembly 4 reaches its upper limit under certain operating conditions. When the leaf spring assembly 4 breaks, the pulling force of the leaf spring on the rubber column 111 will not cause the rubber column 111 to bend, thereby extending the service life of the rubber column 111. When the leaf spring assembly 4 drives the limit block 311 upward, the rubber column 111 can also be better aligned with the limit hole 312. In other embodiments, the strength of the rubber column 111 can also be increased by other methods according to actual conditions, such as by installing iron sheets, applying glue, etc.

[0041] See also Figure 2 As shown, in some embodiments, one end of the fixing stud 112 away from the nut 12 can be extended to the outside of the rubber column 111 .

[0042] In this embodiment, an opening is provided at the lower end of the rubber column 111, and the opening is connected to the through hole inside it. The length of the fixing stud 112 is greater than the length of the rubber column 111. The fixing stud 112 fills the through hole along the length of the rubber column 111, and the lower end part extends out of the rubber column 111 through the opening, which can fully ensure the bending strength of the rubber column 111, avoid the end of the rubber column 111 from being deformed or bent by impact, and extend the service life of the rubber column 111.

[0043] See also Figure 2 and Figure 4 As shown, in some embodiments, a tapered guide portion 114 may be provided at one end of the fixing stud 112 close to the second connecting member 31 , and the cross-sectional dimension of the guide portion 114 may gradually decrease toward the second connecting member 31 .

[0044] In this embodiment, the end of the fixing stud 112 extends to the bottom of the rubber column 111. During installation, the axis of the fixing stud 112 and the axis of the limiting hole 312 are located on the same straight line. However, in actual use, the upward movement trajectory of the limiting block 311 is not necessarily a strictly straight line. Therefore, a tapered guide portion 114 is provided at the lower end of the fixing stud 112. When the leaf spring group 4 drives the limiting block 311 to move upward, the guide portion 114 plays a guiding role, so that the diameter of the part of the fixing stud 112 inserted into the limiting hole 312 increases from small to large, and the fixing stud 112 can be inserted more accurately, avoiding the rubber column 111 and the limiting hole 312 from offsetting each other and failing to connect.

[0045] See also Figure 2 and Figure 5 As shown, in some optional embodiments, a first boss 115 may be fixed to the outer side of the fixing stud 112, and the cross-sectional size of the first boss 115 may be larger than the inner diameter of the through hole; a first groove 116 is provided in the rubber column 111, and the first boss 115 may be fixed to the first groove 116.

[0046] In this embodiment, the first boss 115 is annular, and the inner side of the first boss 115 is fixed to the outside of the fixing stud 112. The outer diameter of the first boss 115 is larger than the inner diameter of the through hole. The first groove 116 is formed by the inner wall of the through hole being recessed outward. The first groove 116 can accommodate the first boss 115. That is, the inside of the rubber column 111 is fixed to the fixing stud 112 through the first boss 115, making the connection between the rubber column 111 and the fixing stud 112 tighter, hindering the tendency of the rubber column 111 to move up and down, preventing the rubber column 111 from moving upward after being hit or falling off the fixing stud 112. At the same time, it can also further improve the bending strength of the rubber column 111 and prevent it from deforming or bending in the horizontal direction. In other embodiments, the rubber column 111 can also be fixed to the fixing stud 112 by other means, such as welding, bolting, gluing, etc.

[0047] See also Figure 2 and Figure 5 As shown, in some embodiments, a second boss 117 may be fixed to the outer side of the fixing stud 112; the stopping mechanism 1 may further include a pad 13 fixed to the frame 2, the fixing stud 112 is passed through the pad 13, the pad 13 is provided with a second groove 131, and the second boss 117 is fixed to the second groove 131.

[0048] In this embodiment, the backing plate 13 is fixed to the vehicle frame 2 by bolts, and the top of the rubber column 111 abuts against the backing plate 13. The backing plate 13 can withstand the impact from the limit block 311 and the twisting force of the fixing stud 112, thereby preventing damage to the vehicle frame 2. The second boss 117 can fix the fixing stud 112 to the backing plate 13 to prevent it from loosening.

[0049] See also Figure 2 and Figure 4 As shown, in some embodiments, a groove ring 113 may be provided on the outer side of the rubber column 111. The groove ring 113 may extend around the rubber column 111, and the inner wall of the groove ring 113 extends obliquely from top to bottom toward the axis of the rubber column 111.

[0050] In this embodiment, the rubber column 111 has multiple sections, and the rubber column 111 of each section is tapered with a thick top and a thin bottom. When the steel leaf spring group 4 drives the limit block 311 to move upward, the rubber column 111 can be easily inserted into the limit hole 312. The two adjacent rubber columns 111 are connected to form a groove ring 113, and the inner wall of the groove ring 113 extends from top to bottom toward the axis direction of the rubber column 111. That is to say, the upper surface of each rubber column 111 will form a horizontal boss. When the limit block 311 moves upward, under the driving force of the steel leaf spring group 4, the inner wall of the limit hole 312 can squeeze and deform the rubber column 111, so that the limit hole 312 is inserted into the rubber column 111. When the rubber column 111 is inserted into the limit hole 312, there are two situations. If the steel leaf spring group 4 When the cam 311 is in the closed position, the spring 311 is in the closed position, and the spring 311 is in the closed position, so that the cam 311 is in the closed position and the spring 311 is not in the closed position.

[0051] See also Figure 4 As shown, in some embodiments, the cross-section of the rubber column 111 can be conical, and the cross-sectional size can gradually decrease from the end close to the frame 2 to the end close to the second connecting member 31; the groove ring 113 can be provided in plurality along the axial direction of the rubber column 111, and the cross-sectional size of each groove ring 113 can decrease as the cross-sectional size of the rubber column 111 decreases.

[0052] In this embodiment, the rubber column 111 has multiple sections, and a groove ring 113 is formed between every two adjacent rubber columns 111. The rubber column 111 is tapered, which makes it easier to enter the limiting hole 312 on the limiting block 311 and has a guiding function. If the leaf spring group 4 breaks, after the rubber column 111 enters the limiting hole 312, the thick top and thin bottom shape of the rubber column 111 combined with its rubber material can prevent the limiting block 311 from falling out, thereby making the connection between the frame 2 and the bridge more stable, and preventing the limiting block 311 from falling out due to the breaking force caused by the leaf spring group 4 shaking due to road conditions.

[0053] See also Figure 3As shown, preferably, the inner wall of the limiting hole 312 may be provided with a tapered guide hole 313 , and the inner radial direction of the guide hole 313 gradually increases in a direction approaching the rubber column 111 .

[0054] In this embodiment, the rubber column 111 is a cylinder. If the limiting hole 312 is also made into a non-chamfered circular hole with the same diameter as the rubber column 111, the trajectory of the leaf spring group 4 is required to be a straight line perpendicular to the frame 2 when jumping up and down. However, in actual application, the trajectory of the center of the leaf spring group 4 will not strictly remain a straight line. If the diameter of the limiting hole 312 is enlarged, the limiting function of the limiting hole 312 will be greatly weakened. Therefore, a compromise solution is adopted. A conical chamfer is designed on the inner wall of the upper end of the limiting hole 312 to form a guide hole 313. When the rubber column 111 is inserted downward into the limiting hole 312, the guide hole 313 increases the acceptance range of the limiting hole 312, which is convenient for guiding, so that the rubber column 111 can be inserted into the limiting hole 312 more accurately. Among them, the size and shape of the guide hole 313 are flexibly set according to actual conditions.

[0055] The principle of a leaf spring group suspension system with a protection mechanism provided by an embodiment of the present invention is as follows:

[0056] When the steering axle bounces within the normal design range, the limit block 311 will not contact the rubber column 111; if the actual road condition is too bumpy and the travel of the leaf spring group 4 is too large, as long as the leaf spring group 4 does not break, the limit block 311 can still be driven out normally by the leaf spring after contacting the rubber column 111, without affecting the normal driving of the vehicle, and the limit block 311 still plays a limiting role; if the leaf spring group 4 breaks completely during driving, the leaf spring group 4 will move up, driving the limit block 311 to move upward, and finally making the limit block 311 stuck with the rubber column 111 through the limit hole 312 of the limit block 311, ensuring the connection between the leaf spring group 4 and the frame 2 at the moment of breaking, thereby ensuring the guiding role along the X direction of the vehicle coordinate system; the fixing stud 112 has two boss structures, which are coupled with the pad 13 and the rubber column 111 respectively, to strengthen the bending strength of the rubber column 111; to ensure alignment when clamping, the limit block 311 on the limit block The center of the positioning hole 312 is located at the intersection of the extended axis of the fixing stud 112 and the upper plane of the limit block 311, and the limit hole 312 is provided with a guide hole 313; to ensure firmness when clamped, the rubber column 111 is designed with multiple groove rings 113 on the basis of the overall boss shape with one end larger and the other end smaller; to ensure the connection strength between the rubber and the frame, the fixing stud 112 is provided with a first boss 115 and a second boss 117, the first boss 115 is coupled with the first groove 116 in the rubber column 111, and the second boss 117 is coupled with the second groove 131 on the pad 13, ensuring that the rubber column 111 is reliably connected to the frame 2 and has sufficient bending strength. In an emergency, it plays the role of connecting the broken leaf spring to the frame 2, so that the bridge and the frame 2 remain positioned and connected, limiting the longitudinal displacement of the bridge, and improving safety. The protection mechanism of this scheme has a simple structure, small space occupation, low cost, and is suitable for a driving protection mechanism for a broken leaf spring (especially a single leaf spring).

[0057] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper" and "lower" is based on the orientation or positional relationship shown in the accompanying 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 therefore cannot be understood as a limitation on the present invention. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0058] It should be noted that, in the present invention, relational terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0059] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but is intended to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A leaf spring suspension system with a protection mechanism, characterized in that: It includes: A vehicle frame (2) having a stop mechanism (1) mounted thereon, wherein the stop mechanism (1) has a first connecting member (11); A leaf spring assembly (4) is mounted on the vehicle frame (2) and is located below the vehicle frame (2); a limiting mechanism (3) is mounted on the leaf spring assembly (4); and the limiting mechanism (3) has a second connecting member (31); When the leaf spring assembly (4) breaks, the leaf spring assembly (4) can drive the second connecting member (31) to connect with the first connecting member (11), and the first connecting member (11) can prevent the leaf spring assembly (4) from continuing to move; The first connecting member (11) comprises a rubber column (111), and the rubber column (111) extends from the bottom of the frame (2) in a direction close to the second connecting member (31); The second connecting member (31) includes a limiting block (311) and a limiting hole (312) provided on the limiting block (311); the leaf spring assembly (4) can drive the limiting block (311) to move toward the rubber column (111), so that the rubber column (111) is inserted into the limiting hole (312); and the limiting hole (312) can prevent the rubber column (111) from being pulled out; A tapered guide hole (313) is provided on the inner wall of the limiting hole (312), and the inner diameter of the guide hole (313) gradually increases in a direction approaching the rubber column (111); The position of the limiting hole (312) satisfies the following conditions: when the leaf spring assembly (4) is at the upper limit position, under normal working conditions, the rubber column (111) passes through the limiting hole; when the leaf spring assembly (4) breaks, the rubber column (111) is stuck in the limiting hole (312); The rubber column (111) satisfies the following conditions: the engagement force between the rubber column (111) and the limiting hole (312) is less than the restoring force of the leaf spring group (4) under normal operation, and is greater than the release force of the rubber column (111) caused by road conditions after the leaf spring group (4) is connected to the limiting hole (312) at the instant of fracture.

2. The leaf spring assembly suspension system with a protection mechanism according to claim 1, wherein: The rubber column (111) is provided with a through hole extending in the length direction, a fixing stud (112) is passed through the through hole, and one end of the fixing stud (112) is fixed to the vehicle frame (2) via a nut (12).

3. The leaf spring assembly suspension system with a protection mechanism according to claim 2, wherein: One end of the fixing stud (112) away from the nut (12) extends to the outside of the rubber column (111).

4. The leaf spring assembly suspension system with a protection mechanism according to claim 2, wherein: A conical guide portion (114) is provided at one end of the fixing stud (112) close to the second connecting member (31), and the cross-sectional dimension of the guide portion (114) gradually decreases in a direction close to the second connecting member (31).

5. The leaf spring assembly suspension system with a protection mechanism according to claim 2, wherein: A first boss (115) is fixed to the outer side of the fixing stud (112), and the cross-sectional dimension of the first boss (115) is larger than the inner diameter of the through hole; A first groove (116) is provided in the rubber column (111), and the first boss (115) is fixed to the first groove (116).

6. The leaf spring assembly suspension system with a protection mechanism according to claim 2, wherein: A second boss (117) is fixed to the outer side of the fixing stud (112); The stopping mechanism (1) further comprises a backing plate (13) fixed on the vehicle frame (2), the fixing stud (112) passing through the backing plate (13), the backing plate (13) being provided with a second groove (131), and the second boss (117) being fixed to the second groove (131).

7. The leaf spring assembly suspension system with a protection mechanism according to claim 1, wherein: A groove ring (113) is provided on the outer side of the rubber column (111), and the groove ring (113) extends around the circumference of the rubber column (111). The inner wall of the groove ring (113) extends obliquely from top to bottom toward the axis direction of the rubber column (111).

8. The leaf spring assembly suspension system with a protection mechanism according to claim 7, wherein: The cross section of the rubber column (111) is tapered, and the cross-sectional size gradually decreases from the end close to the vehicle frame (2) to the end close to the second connecting member (31); A plurality of groove rings (113) are provided along the axial direction of the rubber column (111), and the cross-sectional dimension of each groove ring (113) decreases as the cross-sectional dimension of the rubber column (111) decreases.

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