Leaf spring protection structure and suspension system

Abstract

The present invention belongs to the field of bogie primary suspension systems, and specifically relates to a leaf spring protection structure and suspension system, comprising an elastic block which is arranged on the upper and lower outer surfaces of the leaf spring and is in contact with the spring leaf of the leaf spring, the shape of one side of the elastic block in contact with the spring leaf matches the shape of the spring leaf, the shape of the other side of the elastic block matches the shape of a mounting part, and both ends of the elastic block extend to end connectors of the leaf spring. The present invention can effectively protect the leaf spring and prevent damage.

Description

Technical Field

[0001] The invention belongs to the field of bogie primary suspension systems, and in particular relates to a leaf spring protection structure and a suspension system. Background Art

[0002] The bogie is one of the key components of rail vehicles, and its performance almost determines the dynamic performance of the entire vehicle. The primary suspension is an important part of the bogie, and its reliability is directly related to the driving safety of the entire vehicle. Currently, the commonly used primary suspension system is mostly composed of steel coil springs or rubber springs, and ordinary sand and stone impacts will not affect the primary suspension system. When composite materials are used in primary suspension, sand and stone impacts at high speeds will damage the composite materials, seriously affecting their reliability and service life.

[0003] Composite leaf springs used in primary suspension are constrained in the middle, and the deformation areas on both sides form cavities with the surrounding fittings. Due to the limitations of structural space and structural strength, it is difficult to design an effective drainage structure. The minimum operating or storage temperature of the vehicle is below 0°C. When in a low temperature environment, the snow and water accumulated in the cavity formed by the composite leaf spring and the surrounding fittings will freeze into ice. When the formed ice reaches a certain height, it will contact the surface of the leaf spring, thereby damaging the composite material and seriously affecting its reliability and service life.

[0004] The leaf spring is mainly composed of two interlocking elliptical leaf springs. When the upper and lower leaf springs of the elliptical leaf spring are subjected to vertical loads, the ends extend outward and the ends rotate around the axis in the width direction of the leaf spring. Its end connection device not only connects the upper and lower leaf springs and transmits vertical force, but also allows the upper and lower leaf springs to rotate around the common end axis and extend in the length direction during the vertical loading process. However, in actual application conditions, the stiffness of the upper and lower spring leaves of the leaf spring cannot be exactly the same, so the elongation of the upper and lower spring leaves cannot be exactly the same when loaded.

[0005] In order to solve the above problems, the prior art mostly adopts the end connection method of laminated spring or rubber bushing, and the core of its design is how to realize the end connection device to connect the upper and lower spring leaves, which can transmit the vertical bearing force, and can eliminate the longitudinal displacement between the upper and lower spring leaves through the rubber bushing when the leaf spring is under load, and make the upper and lower spring leaves rotate around the two ends. Its connection mostly adopts pin hole matching and bolt connection, which can play a certain role in preventing disengagement, but both pin hole matching and bolt connection require processing holes on the leaf spring body, which will cause continuous fiber breakage and greatly reduce the life of the leaf spring body. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a leaf spring protection structure and a suspension system, which can effectively protect the leaf spring and prevent damage.

[0007] The present application provides a leaf spring protection structure, comprising an elastic block arranged on the upper and lower outer surfaces of the leaf spring and fitted with the spring leaf of the leaf spring, the shape of one side of the elastic block fitted with the spring leaf matches the shape of the spring leaf, the shape of the other side of the elastic block matches the shape of the mounting piece, and both ends of the elastic block extend to the end connectors of the leaf spring.

[0008] The upper and lower outer surfaces of the leaf spring are the upper surface of the upper spring leaf and the lower surface of the lower spring leaf of the leaf spring. The fitting means close contact. Generally speaking, the mounting piece is a straight shape, that is, a horizontal plane, and the shape of the elastic block is thin in the middle and gradually thick at both ends. The elastic block fills the space between the spring leaf and the mounting piece to prevent external debris, such as gravel and ice, from entering the above space and damaging the leaf spring or related accessories during the squeezing process.

[0009] In one embodiment, the elastic block further includes an elastic block extension section covering the end connecting piece or exposed outside the leaf spring.

[0010] In one embodiment, the leaf spring protection structure includes an upper pressure plate disposed on the upper portion of the upper spring sheet of the leaf spring and a U-shaped upper clamping plate enclosed on the upper spring sheet and connected to the upper pressure plate at both ends.

[0011] In one embodiment, the leaf spring protection structure includes a vertical stopper arranged on the upper part of the lower spring leaf of the leaf spring and a lower pressure plate arranged on the lower part of the lower spring leaf of the leaf spring.

[0012] In one embodiment, the mounting member is a bogie mounted on the upper part of the leaf spring and a rubber spring mounted on the lower part of the leaf spring. The shape of the other side of the elastic block is straight, which matches the shape of the mounting member.

[0013] The present invention provides a suspension system, comprising a leaf spring and a leaf spring protection structure arranged on the leaf spring, wherein the leaf spring comprises an end connecting piece connecting two spring leaves arranged opposite to each other up and down, the end connecting piece comprises a rotating shaft and two relatively rotatable fixing seats sleeved on the rotating shaft and respectively fixing the two spring leaves, the fixing seat comprises an enclosing portion enclosing the ends of the spring leaves in at least three directions to fix the spring leaves.

[0014] The three directions of the present invention include at least the bottom, top and end of the spring sheet, and may also include one or two side portions of the spring sheet. The enclosed portion in at least three directions is used to fix the spring sheet, ensure the longitudinal and lateral positioning of the upper and lower spring sheets, and limit the longitudinal and lateral movement, while preventing the upper and lower spring sheets from vertically disengaging and longitudinally shifting.

[0015] The fixing seat includes a fixing sleeve sleeved on the rotating shaft, a supporting plate fixed on the fixing sleeve and adapted to the spring sheet, an end baffle fixed on the supporting plate and located at the end of the spring sheet, and a side baffle located at the side of the spring sheet. The spring sheet is provided with an end limiting plate, a card slot is provided on the end limiting plate, and a buckle plate adapted to the card slot and used to fix the spring sheet is fixed on the end baffle or the side baffle.

[0016] The bearing plate is adapted to the spring sheet, the end baffle is located at the end of the spring sheet, and the side baffle is located at the side of the spring sheet.

[0017] In one embodiment, the fixing seat includes two support seats for fixing one spring sheet and two outer sleeve seats for fixing another spring sheet, and the two support seats are located on both sides of the two outer sleeve seats. The present invention has two end connectors, and each end connector contains four fixing seats, and the four fixing seats are independent of each other. Two fixing seats are in the middle, which are outer sleeve seats, and two fixing seats are at both ends, which are support seats. Preferably, the outer sleeve seat is used to fix the lower spring sheet, and the support seat is used to fix the upper spring sheet, which can avoid water or debris accumulation in the cavity formed between the middle of the outer sleeve seat and the support seat for easy rotation, causing damage to the end connector; the outer sleeve seat is located in the middle, which can better bear the pressure. The present application has two end connectors, which are respectively arranged at the two ends of the spring sheet, and the spring sheet includes an upper spring sheet and a lower spring sheet. The bearing plate of the support seat of the present application is adapted and fitted with the upper part of the upper spring sheet, and the bearing plate of the outer sleeve seat of the present application is adapted and fitted with the upper part of the lower spring sheet. Specifically, for the lower spring leaf, the end of the lower spring leaf abuts against the end baffle, the side of the lower spring leaf abuts against the side baffle, and the lower part of the lower spring leaf abuts against the buckle plate, so the five directions of the end of the lower spring leaf are restricted by the end connector, and similarly, the two ends of the upper spring leaf are also restricted. In addition, there are no slots on the spring leaf to prevent the continuous fibers of the spring leaf from being cut, thereby ensuring the structural strength of the spring leaf and effectively extending the service life of the leaf spring.

[0018] In order to further limit the relative displacement between the end connector and the spring sheet, the present application provides an end limit plate on the spring sheet, and the end limit plate is provided with a card slot. The card slot and the buckle plate cooperate to further limit the possibility of displacement of the spring sheet and the end connector, and prevent the spring sheet from shifting with the end connector under complex working conditions, causing the spring sheet to fall out of the end connector and damage the spring sheet and the end connector.

[0019] In one embodiment, a buckle plate adapted to the card slot is fixed on the side baffle for fixing the spring sheet. The buckle plate is arranged on the side baffle. On the one hand, it is closer to the center of the torque, and on the other hand, it has better wrapping properties, which can better prevent the spring sheet from falling out of the end connector and damage the spring sheet and the end connector.

[0020] In one embodiment, the end limit plate is a glass fiber plate, which can be made of the same material as the spring sheet, so as to achieve better integration and avoid damage to the main body of the spring sheet.

[0021] In one embodiment, a through hole is provided in the rotating shaft, and a bolt passing through the through hole for hingedly connecting the two fixing seats is also provided. The ends of the bolt are fixed by nuts, and the structure is simple.

[0022] In one embodiment, a bushing (preferably a rubber bushing) is provided on the rotating shaft, the outer sleeve seat is sleeved on the bushing, and the support seat is sleeved on the rotating shaft. The bushing of the present invention is not located in the entire rotating shaft, but only in the middle part, that is, the position of the outer sleeve seat. At this time, different apertures are required between the outer sleeve seat and the support seat to adapt to the different rotating shaft diameters in the middle part. Therefore, the outer sleeve seat and the support seat will be isolated to a certain extent by the rubber bushing to prevent the two from squeezing and colliding with each other and damaging each other during rotation. In addition, the bushing can also prevent damage to the rotating shaft and the fixed seat during rotation.

[0023] In one embodiment, a pad is provided in the middle of the spring sheet, and the pad is preferably a non-metal pad.

[0024] In one embodiment, the spring leaf includes a middle connecting section, a middle equal stress section and an end connecting section which are connected in sequence from the middle to the end. The thickness of the middle equal stress section changes in a parabolic manner, which can reduce the shear stress between the leaf spring layers.

[0025] The beneficial effect of the present invention is that during use, the leaf spring will be in compression and extension and move repeatedly. It is necessary to keep enough space between the leaf spring and the mounting part, such as the rubber spring and the bogie, for the above movement. However, if debris enters the above space during operation, it will cause the debris to be squeezed during the compression process. At this time, on the one hand, the volume of the space is reduced, and on the other hand, the force of the leaf spring at the debris is significantly higher than that of other parts. In this case, it is easy to damage the leaf spring. However, because the leaf spring needs this space when it is running, the technicians generally do not fill this space. The general practice is mainly to keep the environment clean, clean it regularly, and try to reduce the possibility of debris entering the above space. The elastic block of the present invention is made of elastic polymer materials such as silicone rubber and polyurethane through a foaming process, has excellent compression elasticity, very small density, and its stiffness is more than 20 times smaller than the stiffness of the leaf spring body. The present invention uses an elastic block to fill the space between the leaf spring and the mounting part, which can be deformed with the deformation of the leaf spring, will not affect the overall stiffness performance, and completely avoids the possibility of damage. More importantly, it maintains a compressible space, does not generate additional resistance, and does not affect the operation of the leaf spring itself.

[0026] The present invention realizes the function of end connection, has an anti-slip structure, does not damage the continuity of the leaf spring reinforcement fibers, effectively reduces maintenance costs, and prolongs the service life of the leaf spring.

[0027] The present invention adopts an end connector to connect the upper and lower spring leaves without damaging the continuity of the fibers at the end of the leaf spring, so as to transmit the vertical bearing force. The upper and lower spring leaves of the leaf spring can be made of fiber-reinforced composite materials, and the leaf spring can eliminate the longitudinal displacement between the upper and lower spring leaves when bearing loads and can rotate around the two ends. It has an anti-slip structure, which effectively improves the service life of the composite leaf spring body and the safety and reliability of the assembly. The leaf spring structure adopted by the present invention has uniform stress distribution and uses the least material, which can reduce the interlaminar shear stress, and adopts a non-metallic pad with high reliability, which can improve the reliability of the composite leaf spring body and reduce the production and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic structural diagram of a leaf spring according to an embodiment of the present invention.

[0029] Figure 2 The figure is a schematic side view of a spring sheet according to an embodiment of the present invention.

[0030] Figure 3 It is a schematic diagram of an exploded view of an end connector according to an embodiment of the present invention.

[0031] Figure 4 The figure is a schematic diagram of the outer sleeve seat structure of an embodiment of the present invention.

[0032] Figure 5 The figure is a schematic diagram of the support base structure according to an embodiment of the present invention.

[0033] Figure 6 This is a schematic diagram of the assembly of a leaf spring protection structure according to an embodiment of the present invention.

[0034] Figure 7 The figure is a schematic diagram of a leaf spring protection structure according to an embodiment of the present invention.

[0035] Figure 8 The figure is a schematic cross-sectional view of a leaf spring protection structure according to an embodiment of the present invention.

[0036] Fig. 9 It is a structural diagram of the elastic block.

[0037] In the figure, 1 is a spring sheet, 11 is a middle connecting section, 12 is a middle equal stress section, 13 is an end connecting section, 14 is an end limit plate, 2 is an end connecting piece, 2 is a left support seat, 22 is a left outer sleeve seat, 23 is a right outer sleeve seat, 24 is a right support seat, 25 is a bushing, 26 is a bolt, 27 is a gasket, 28 is a nut, 29 is a rotating shaft; 211 is a side baffle of a support seat, 212 is a bearing plate of a support seat, 213 is an end baffle of a support seat, 214 is a mounting hole of a support seat, 215 is a buckle plate of a support seat; 221 is a side baffle of an outer sleeve seat, 222 is a bearing plate of an outer sleeve seat, 223 is an end baffle of an outer sleeve seat, 224 is a mounting hole of an outer sleeve seat, 225 is a buckle plate of an outer sleeve seat, 3 is a pad; 4 is a bogie, 5 is a rubber spring, 6 is a vertical stopper, 7 is an elastic block, 15 is an upper spring sheet, 8 is an upper pressure plate, 9 is an upper clamp, 10 is a lower pressure plate, 16 is a lower spring sheet, and 71 is an extension section of an elastic block. DETAILED DESCRIPTION

[0038] Example 1

[0039] A leaf spring protection structure comprises an elastic block 7 which is arranged on the upper and lower outer surfaces of the leaf spring and is in contact with a spring leaf 1 of the leaf spring, wherein the shape of one side of the elastic block 7 in contact with the spring leaf 1 matches the shape of the spring leaf 1, the shape of the other side of the elastic block 7 matches the shape of a mounting member, and both ends of the elastic block 7 extend to the end connector 2 of the leaf spring.

[0040] The mounting parts are a bogie 4 mounted on the upper part of the leaf spring and a rubber spring 5 mounted on the lower part of the leaf spring. The shape of the other side of the elastic block is straight, which matches the shape of the mounting parts. The elastic block 7 is bonded to the bogie 4 and the rubber spring 5. The above shape of the elastic block 7 can avoid damage by foreign matter and will not affect the operation of the leaf spring.

[0041] The elastic block 7 also includes an elastic block extension section 71 that covers the end connector 2 or is exposed to the outside of the leaf spring. The elastic block extension section 71 covers the exposed surface of the leaf spring, which can effectively protect the exposed surface of the leaf spring from being impacted by sand and gravel. The shape of the elastic block 7 is the same as the shape of the cavity formed by the leaf spring and the mounting mating surface. After assembly, the elastic block 7 fills the cavity to prevent sand, water, snow, etc. from entering and accumulating, affecting reliability and life.

[0042] The leaf spring protection structure includes an upper pressure plate 8 disposed on the upper spring sheet 15 of the leaf spring and a U-shaped upper clamping plate 9 enclosed on the upper spring sheet 15 and connected to the upper pressure plate 8 at both ends. The upper pressure plate 8 is located on the upper surface of the middle part of the upper spring sheet 15 to prevent the leaf spring from directly contacting the mounting part matched with it, effectively protecting the leaf spring and improving its reliability and service life; the upper clamping plate 9 is U-shaped, and both sides are connected to the mounting part matched with the leaf spring assembly by bolts. A pad 3 is arranged between the upper clamping plate 9 and the inner arc surface of the upper spring sheet 15 to prevent the upper spring sheet 15 from directly contacting the upper clamping plate 9.

[0043] The leaf spring protection structure includes a vertical stopper 6 arranged on the upper part of the lower spring leaf 16 of the leaf spring and a lower pressure plate 10 arranged on the lower part of the lower spring leaf 16 of the leaf spring. The vertical stopper 6 is installed in the cavity between the upper and lower spring leaves, and can be connected to the top plate of the rubber spring 5 by bolts. The lower pressure plate 10 is located in the middle of the outer arc surface of the lower spring leaf 16 to prevent the lower spring leaf 16 from directly contacting the metal top plate of the rubber spring 5; a pad 3 made of polymer is arranged in the middle of the inner arc surface of the lower spring leaf 16 to prevent the leaf spring from directly contacting the metal base of the vertical stopper 6.

[0044] The upper pressing plate 8 of the leaf spring is provided with concave notches at the four corners, which cooperate with the protruding steps at the four corners of the upper clamping plate 9 to prevent the upper pressing plate 8 of the leaf spring from rotating during assembly, thereby reducing the difficulty of assembly and improving firmness.

[0045] The elastic block 7 of the present invention is made of elastic polymer materials such as silicone rubber and polyurethane by foaming process, and has excellent compression elasticity and very small material density. When the composite leaf spring is operating normally in the vehicle, the lower spring leaf 16 will open and close with a fixed load + amplitude, and the bell mouth formed between the rubber spring 5 top plate will also open and close accordingly. The elastic block 7 can deform with the deformation of the lower spring leaf 16 without affecting the overall stiffness performance. In addition, the elastic block 7 is very light in weight. While achieving the function, the weight of the system increases very little, which does not affect the overall lightweight.

[0046] The elastic block 7 is foamed in a mold, and the shape of the mold cavity is the same as that of the elastic block 7, so that the outer surface of the elastic block 7 is continuously closed. No water will enter the internal pores, which can effectively prevent the ice formation of the internal water at low temperatures, thereby increasing the rigidity of the elastic block and affecting the overall performance.

[0047] Example 2

[0048] like Figure 1-5 As shown, a leaf spring with a long service life includes an end connector 2 connecting two spring leaves 1 arranged opposite to each other in an upper and lower direction, the end connector 2 includes a rotating shaft 29 and two fixing seats sleeved on the rotating shaft 29 for fixing the two spring leaves, the fixing seat includes a fixing sleeve sleeved on the rotating shaft 29, a bearing plate fixed on the fixing sleeve and adapted to the spring leaf 1, an end baffle fixed on the bearing plate and located at the end of the spring leaf 1, and a side baffle located on the side of the spring leaf, the spring leaf 1 is provided with an end limiting plate 14, the end limiting plate 14 is provided with a card slot, and a buckle plate adapted to the card slot and used to fix the spring leaf is fixed on the end baffle or the side baffle.

[0049] The spring sheet is in an arch shape, and two spring sheets are arranged up and down to form an elliptical leaf spring through an end connector 2. The arch leaf spring adopts a single-piece structure, and the material is epoxy resin reinforced fiber prepreg, and the reinforced fiber is continuous fiber such as glass fiber and carbon fiber.

[0050] A buckle plate adapted to the slot and used to fix the spring sheet is fixed on the side baffle.

[0051] The end limiting plate 14 is a glass fiber board.

[0052] The rotating shaft 29 is provided with a through hole therein, and also includes a bolt 26 passing through the through hole for hingedly connecting the two fixing seats.

[0053] The fixing seat comprises two supporting seats for fixing one spring sheet and two outer sleeve seats for fixing another spring sheet, and the two supporting seats are located on both sides of the two outer sleeve seats.

[0054] The rotating shaft 29 is provided with a bushing 25 , the outer sleeve seat is sleeved on the bushing 25 , and the supporting seat is sleeved on the rotating shaft 29 .

[0055] The bushing 25 is a rubber bushing.

[0056] like Figure 3-5 As shown, the outer sleeve seat includes a left outer sleeve seat 22 and a right outer sleeve seat 23, each of which includes a fixing sleeve, an outer sleeve seat bearing plate 222, an outer sleeve seat end baffle 223, and an outer sleeve seat side baffle 221. The fixing sleeve is provided with an outer sleeve seat mounting hole 224 for matching with the bushing 25. The left and right outer sleeve seats are also provided with an outer sleeve seat buckle plate 225 for matching with the card slot, which has the functions of press-fit positioning and anti-rotation, and can prevent the end of the leaf spring from falling out of the end outer sleeve seat.

[0057] The support seat includes a left support seat 21 and a right support seat 24, each support seat includes a fixed sleeve, a support seat side baffle 211, a support seat bearing plate 212 and a support seat end baffle 213. The fixed sleeve is provided with a support seat mounting hole 214 for cooperating with the rotating shaft, and the support seat side baffle 211 is provided with a support seat buckle plate 215 for cooperating with the card slot. It has press-fit positioning and anti-rotation functions, which can prevent the end of the leaf spring from falling out of the end sleeve seat.

[0058] First, install the bushing 25 on the shaft 29, and put the left outer sleeve 22 and the right outer sleeve 23 on the bushing 25, then install the left support seat 21 and the right support seat 24 on the shaft, install the end of the spring sheet in the space formed by the bearing plate, the end baffle, the side baffle and the gusset plate, insert the bolt 26 and the gasket 27, and tighten the nut 28 to fix it. At this time, the upper and lower spring sheets can make a certain degree of relative movement in the direction of the shaft to form a leaf spring.

[0059] The bushing 25 of the present invention is pressed into the left outer sleeve seat 22 and the right outer sleeve seat 23 by interference, and the rotating shaft 29 is pressed into the left support seat 21, the right support seat 24 and the bushing 25 by interference. The interference connection part between the bushing 25 and the rotating shaft 29 is a circle of thin rubber layer.

[0060] A pad 3 is arranged in the middle of the spring sheet 1. The pad 3 is a non-metallic pad. The non-metallic pad is made of multiple layers of impregnated cord fabric or impregnated canvas. The impregnated cord fabric and the impregnated canvas can be vulcanized first and then bonded to the bow leaf spring, or they can be directly laid on the bow leaf spring and cured together with the leaf spring, thereby improving the reliability of the non-metallic pad and effectively protecting the composite leaf spring.

[0061] The spring leaf 1 includes a middle connecting section 11, a middle iso-stress section 12 and an end connecting section 13 which are connected in sequence from the middle to the end. The thickness of the middle iso-stress section 12 changes in a parabolic manner. The middle iso-stress section adopts a parabolic variable thickness design to achieve equal stress along the length direction of the leaf spring and the least material; the middle connecting section and the end connecting section adopt an increased thickness design, with the thickness increased by 2mm to 10mm, which can reduce the interlaminar shear stress of the leaf spring.

[0062] A person skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of protection of the present application is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of different aspects of one or more embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0063] One or more embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the present application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of the present application should be included in the protection scope of the present application.

Claims

1. A suspension system, characterized in that: The invention comprises a leaf spring and a leaf spring protection structure arranged on the leaf spring, the leaf spring comprising an end connecting member (2) connecting two spring leaves (1) arranged opposite to each other in an upper and lower direction, the end connecting member (2) comprising a rotating shaft (29) and two relatively rotatable fixing seats sleeved on the rotating shaft (29) for fixing the two spring leaves (1) respectively, the fixing seats comprising an enclosing portion enclosing the ends of the spring leaves (1) in at least three directions to fix the spring leaves (1); The fixing seat comprises a fixing sleeve sleeved on the rotating shaft (29), a bearing plate fixed on the fixing sleeve and adapted to the spring sheet (1), an end baffle fixed on the bearing plate and located at the end of the spring sheet (1), and a side baffle located at the side of the spring sheet, the spring sheet (1) being provided with an end stop plate (14), the end stop plate (14) being provided with a slot, and a buckle plate adapted to the slot and used to fix the spring sheet being fixed on the end baffle or the side baffle; The leaf spring protection structure comprises an elastic block (7) arranged on the upper and lower outer surfaces of the leaf spring and abutting against a spring sheet (1) of the leaf spring, the shape of one side of the elastic block (7) abutting against the spring sheet (1) matching the shape of the spring sheet (1), the shape of the other side of the elastic block (7) matching the shape of the mounting member, and both ends of the elastic block (7) extending to the end connecting member (2) of the leaf spring.

2. The suspension system according to claim 1, characterized in that: A buckle plate adapted to the slot and used to fix the spring sheet is fixed on the side baffle.

3. The suspension system according to claim 1, characterized in that: The rotating shaft (29) is provided with a through hole therein and also includes a bolt (26) passing through the through hole and used for hingedly connecting the two fixing seats.

4. The suspension system according to any one of claims 1 to 3, characterized in that: The fixing seat comprises two supporting seats for fixing one spring sheet and two outer sleeve seats for fixing another spring sheet, and the two supporting seats are located on both sides of the two outer sleeve seats.

5. The suspension system according to claim 4, characterized in that: The rotating shaft (29) is provided with a bushing (25), the outer sleeve seat is sleeved on the bushing (25), and the support seat is sleeved on the rotating shaft (29).

6. The suspension system according to claim 1, characterized in that: The elastic block (7) further comprises an elastic block extension section (71) covering the end connecting piece (2) or exposed outside the leaf spring.

7. The suspension system according to claim 1, wherein: The leaf spring protection structure comprises an upper pressure plate (8) arranged on the upper part of the upper spring sheet (15) of the leaf spring, and a U-shaped upper clamping plate (9) enclosing the upper spring sheet (15) and connected to the upper pressure plate (8) at both ends.

8. The suspension system according to claim 1, wherein: The leaf spring protection structure comprises a vertical stopper (6) arranged on the upper part of the lower spring leaf (16) of the leaf spring and a lower pressure plate (10) arranged on the lower part of the lower spring leaf (16) of the leaf spring.

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