Buffering and damping structure of composite plate spring and manufacturing method

Abstract

The invention relates to the technical field of automobile accessories, and provides a buffering and damping structure of a composite plate spring and a manufacturing method for the buffering and damping structure of the composite plate spring aiming at the situation that a transition buffering piece between a traditional metal frame and the composite plate spring is prone to being abraded, and the buffering and damping structure of the composite plate spring comprises a composite plate spring body, the metal frame and the transition buffering piece; the periphery of the composite plate spring body is sleeved with the metal frame, the metal frame is formed by splicing an inverted-U-shaped upper clamping plate and an inverted-U-shaped lower clamping plate, and an annular gap is reserved between the metal frame and the periphery of the composite plate spring body. The transition buffering piece comprises polyurethane colloid filled in the annular gap, and the inverted-U-shaped upper clamping plate and the lower clamping plate are both fixed to the periphery of the composite plate spring body in an adhesive mode through the polyurethane colloid. The composite plate spring has the effect of improving the phenomenon that the transition buffer piece between the metal frame and the composite plate spring is prone to failure after being pressed for a long time.

Description

Technical Field

[0001] This application relates to the technical field of automotive parts, and in particular to a cushioning and shock-absorbing structure for composite leaf springs and its manufacturing method. Background Technology

[0002] Composite leaf springs (hereinafter referred to as "composite leaf springs") have advantages over traditional steel leaf springs, such as being lightweight and having better fatigue life and durability.

[0003] In this related technology, a metal frame is fitted and fixed in the middle of the composite leaf spring; the metal frame is used to subsequently fix it to the vehicle frame with U-bolts. When the composite leaf spring is fixed to the vehicle frame and axle by U-bolts, the metal frame and U-bolts are in direct contact, forming a rigid connection point between the composite leaf spring and the U-bolts. This effectively increases the contact area between the U-bolts and the composite leaf spring, facilitating the transfer of load between the vehicle frame and the leaf spring body.

[0004] Because friction occurs when the metal frame and the composite leaf spring come into contact, which can easily cause wear to the leaf spring itself, a rubber pad is usually placed between the metal frame and the composite leaf spring as a transition buffer to limit direct contact between the metal frame and the composite leaf spring while buffering and damping the composite leaf spring.

[0005] Regarding the aforementioned technologies, under long-term load or overload conditions, rubber transition buffers are prone to stress relaxation and permanent compression deformation, which leads to loss of buffer and wear resistance, loss of connection torque, and ultimately damage and failure of the composite leaf spring, affecting the normal function of the composite leaf spring. Therefore, there is room for improvement. Summary of the Invention

[0006] To address the technical problem of the transition buffer between the metal frame and the composite leaf spring being prone to failure under long-term pressure, this application provides a buffer and shock absorption structure and manufacturing method for a composite leaf spring.

[0007] This application provides a cushioning and shock-absorbing structure and manufacturing method for a composite leaf spring, which adopts the following technical solution: A cushioning and shock-absorbing structure for a composite leaf spring includes a composite leaf spring body, a metal frame, and a transition buffer component; The metal frame is sleeved on the outer periphery of the composite leaf spring body. The metal frame is formed by splicing an inverted U-shaped upper clamping plate and a lower clamping plate. An annular gap is left between the inner periphery of the metal frame and the outer periphery of the composite leaf spring body. The transition buffer includes polyurethane colloid filling the annular gap, and the inverted U-shaped upper clamp and the lower clamp are both bonded and fixed to the outer periphery of the composite leaf spring body by the polyurethane colloid.

[0008] By adopting the above technical solution, polyurethane colloid is used as a transition buffer to fill the annular gap between the metal frame and the composite leaf spring body. Compared with traditional rubber transition buffers, polyurethane colloid can maintain stable elasticity and buffering performance under long-term load and overload conditions, effectively avoiding the failure of the transition buffer and reducing direct friction and wear between the metal frame and the composite leaf spring body. At the same time, the metal frame can achieve a stable connection with the composite leaf spring body through the polyurethane colloid, limiting the relative movement between the metal frame and the composite leaf spring body when subjected to force. This facilitates the better transfer of external loads from the vehicle body to the composite leaf spring body through the metal frame, effectively improving the working stability of the composite leaf spring.

[0009] Preferably, the inverted U-shaped upper clamping plate includes two side portions, and the bottom of each side portion has a limiting notch corresponding to the lower clamping plate. The lower clamping plate is embedded in the limiting notch of the two side portions.

[0010] By adopting the above technical solution, the lower clamping plate is embedded in the limiting notches on both sides of the inverted U-shaped upper clamping plate, which is conducive to the rapid positioning and circumferential limiting between the inverted U-shaped upper clamping plate and the lower clamping plate. This avoids lateral misalignment or displacement of the metal frame during assembly and stress, and further facilitates the subsequent filling of the annular gap between the metal frame and the composite leaf spring body with polyurethane glue.

[0011] Preferably, the limiting notch is provided with a limiting protrusion corresponding to the lower clamping plate, and limiting grooves are provided on both sides of the lower clamping plate corresponding to the limiting protrusions, with the limiting protrusions being embedded in the corresponding limiting grooves.

[0012] By adopting the above technical solution, by embedding the limiting protrusion of the inverted U-shaped upper clamping plate into the limiting groove corresponding to the lower clamping plate, it is beneficial to further realize the locking and limiting between the inverted U-shaped upper clamping plate and the lower clamping plate, effectively limiting the relative movement between the lower clamping plate and the inverted U-shaped upper clamping plate when the subsequent metal frame is subjected to force, so that the external load can be better applied to the composite leaf spring body through the metal frame.

[0013] Preferably, both ends of the lower clamping plate are formed with deformable inclined surfaces, which extend downwards at an angle away from the lower clamping plate.

[0014] By adopting the above technical solution, when the composite leaf spring body is subjected to bending deformation, the deformation slope can provide sufficient deformation avoidance space for the polyurethane colloid between the metal frame and the composite leaf spring body, avoiding excessive compression, stress concentration or shear damage at the end of the lower clamping plate when the colloid is bent and squeezed by the leaf spring, and ensuring that the polyurethane colloid can still maintain stable buffering, shock absorption and wear resistance under long-term alternating load.

[0015] A method for manufacturing a cushioning and damping structure of composite leaf springs as described above includes the following steps: S1: Metal frame assembly: The inverted U-shaped upper and lower clamping plates are assembled to the outer periphery of the composite leaf spring body using glue injection tooling to form a metal frame fitted around the outer periphery of the composite leaf spring body. S2: Polyurethane colloid filling: Polyurethane colloid is filled into the annular gap between the metal frame and the composite leaf spring body using a glue injection tool; S3: Remove the glue injection fixture.

[0016] By adopting the above technical solution, the assembly of the metal frame and the filling of polyurethane colloid are completed with the assistance of the glue injection tool. On the one hand, this is conducive to the formation of the annular gap between the metal frame and the composite leaf spring body. On the other hand, it is conducive to the directional filling of polyurethane colloid in the subsequent process.

[0017] Preferably, both ends of the top of the inverted U-shaped upper clamping plate are provided with glue injection notches; The glue injection fixture includes a U-shaped limiting plate, a U-shaped support block, and an inverted U-shaped snap-fit ​​block; The U-shaped limiting plate is used for the bottom of the U-shaped support block, the lower clamping plate, and the inverted U-shaped upper clamping plate to be embedded. The U-shaped support block is provided in two places, and the U-shaped support block is used for the composite leaf spring body to be embedded; The inverted U-shaped snap-fit ​​block is provided in two places. The inverted U-shaped snap-fit ​​block is used for the composite leaf spring body to be embedded. The inverted U-shaped snap-fit ​​block can be docked with the U-shaped support block to form a ring structure that is sleeved on the outer periphery of the composite leaf spring body. The specific steps of step S1 are as follows: S1.1: The lower clamping plate is embedded in the U-shaped limiting plate; S1.2: The two U-shaped support blocks are respectively embedded at both ends of the U-shaped limiting plate; S1.3: Embed the composite leaf spring body into the two U-shaped support blocks; S1.4: Fit the inverted U-shaped upper clamping plate onto the outer periphery of the composite leaf spring body, and embed the bottom end of the inverted U-shaped upper clamping plate into the U-shaped limiting plate; S1.5: Insert the two inverted U-shaped snap-fit ​​blocks into the composite leaf spring bodies located at both ends of the inverted U-shaped upper clamping plate, and make the two inverted U-shaped snap-fit ​​blocks mate with the two U-shaped support blocks respectively, so as to seal the openings at both ends of the annular gap between the composite leaf spring body and the metal frame. The specific steps of step S2 are as follows: inject glue into the annular gap between the composite leaf spring body and the metal frame through the glue injection notch on the inverted U-shaped upper clamping plate.

[0018] By adopting the above technical solution, the composite leaf spring body and the metal frame are positioned and limited by the cooperation of the U-shaped limiting plate, U-shaped support block and inverted U-shaped snap-fit ​​block, so as to ensure the uniformity of the annular gap between the composite leaf spring body and the metal frame. At the same time, the U-shaped support block and the inverted U-shaped snap-fit ​​block form an annular structure to seal the openings at both ends of the annular gap, which is conducive to the subsequent injection of polyurethane glue to better fill the annular gap between the metal frame and the composite leaf spring body.

[0019] Preferably, each end of the inverted U-shaped snap-fit ​​block is provided with an inverted U-shaped sleeve plate, which is used to fit onto the end of the inverted U-shaped upper clamping plate to cover the glue injection notch; the inverted U-shaped sleeve plate is provided with a through hole corresponding to the glue injection notch; In step S1.5, while inserting the inverted U-shaped snap-fit ​​block into the composite leaf spring body, the inverted U-shaped sleeve plate is sleeved onto the end of the inverted U-shaped upper clamping plate.

[0020] By adopting the above technical solution, by fitting the inverted U-shaped sleeve plate onto the end of the inverted U-shaped upper clamping plate, and injecting grout into the injection notch through the through hole on the inverted U-shaped sleeve plate, it is beneficial to limit the irregular overflow of the subsequently injected polyurethane colloid through the injection notch at the end of the inverted U-shaped upper clamping plate, thereby facilitating the better formation of the polyurethane colloid in the injection notch at the end of the inverted U-shaped upper clamping plate.

[0021] Preferably, in step S2, the through holes on the two inverted U-shaped socket plates are connected to an adhesive injection device and a vacuuming device, respectively; while injecting polyurethane adhesive into the metal frame through the adhesive injection device, a vacuum is drawn into the metal frame through the vacuuming device.

[0022] By adopting the above technical solution, vacuuming is performed while injecting the adhesive, which helps to quickly expel air from the annular gap, effectively preventing the formation of bubbles, voids, or inclusions inside the adhesive. This allows the polyurethane adhesive to fully and uniformly fill the entire annular gap, effectively improving the density and structural stability of the polyurethane adhesive, and thus helping to improve the overall performance and service life of the composite leaf spring buffer and shock absorption structure.

[0023] In summary, this application includes at least one of the following beneficial technical effects: 1. Using polyurethane colloid as a transitional connector between the metal frame and the composite leaf spring body effectively reduces the failure of the transitional connector due to long-term load and overload conditions. At the same time, polyurethane colloid can be used to achieve a stable connection between the metal frame and the composite leaf spring body.

[0024] 2. By setting the deformation slopes at both ends of the lower clamping plate, when the composite leaf spring is subjected to force and undergoes reverse arch deformation, the deformation slopes can provide deformation space for the polyurethane colloid between the metal frame and the composite leaf spring, so that the polyurethane colloid can deform and extend, reducing the damage and failure of the polyurethane colloid due to stress concentration.

[0025] 3. By using the glue injection tool, the annular uniformity between the metal frame and the composite leaf spring body is achieved, while the openings at both ends of the annular gap are temporarily sealed, which is conducive to the better filling and molding of the subsequently injected polyurethane glue into the annular gap. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the composite leaf spring damping structure used in this application.

[0027] Figure 2 This is an internal schematic diagram used in this application to illustrate the buffer and shock absorption structure.

[0028] Figure 3 This is an exploded schematic diagram used in this application to illustrate the metal frame.

[0029] Figure 4 This is a schematic diagram used in this application to illustrate the structure of assembling composite leaf springs using a glue injection fixture.

[0030] Figure 5 This is an exploded view of the glue-dispensing fixture used in this application.

[0031] Explanation of reference numerals in the attached figures: 1. Composite leaf spring body; 2. Metal frame; 20. Positioning pin; 21. Inverted U-shaped upper clamping plate; 210. Injection notch; 211. Limiting notch; 212. Limiting protrusion; 22. Lower clamping plate; 221. Deformation slope; 222. Limiting groove; 3. Polyurethane colloid; 4. Upper end plate; 5. Lower end plate; 6. U-shaped limiting plate; 7. U-shaped support block; 8. Inverted U-shaped snap-fit ​​block; 81. Inverted U-shaped sleeve plate; 80. Through hole. Detailed Implementation

[0032] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0033] This application discloses a cushioning and shock-absorbing structure and manufacturing method for a composite leaf spring, referring to... Figure 1 and Figure 2 The device includes a composite leaf spring body 1, a metal frame 2, and a transition buffer. The metal frame 2 is fitted around the outer periphery of the composite leaf spring body 1, and an annular gap is left between the inner periphery of the metal frame 2 and the composite leaf spring body 1. The transition buffer includes polyurethane colloid 3 filled in the annular gap. The metal frame 2 is bonded and fixed to the composite leaf spring body 1 by the polyurethane colloid 3.

[0034] Reference Figure 1 The composite leaf spring body 1 is made of glass fiber reinforced epoxy resin or polyurethane resin through a prepreg molding process. Both ends of the composite leaf spring body 1 are provided with an upper end plate 4 and a lower end plate 5. The upper end plate 4 and lower end plate 5 are used to shield and reinforce the ends of the composite leaf spring, limiting direct contact between subsequent frame connecting parts and the ends of the composite leaf spring body 1, thus preventing wear. In this embodiment, the upper end plate 4 is made of 45# steel, and the lower end plate 5 is made of spring steel.

[0035] Reference Figure 1 Several fastening bolts are provided at the ends of the composite leaf spring corresponding to the upper end plate 4 and the lower end plate 5. The fastening bolts are sequentially inserted from bottom to top through the lower end plate 5, the composite leaf spring body 1 and the upper end plate 4. The ends of the fastening bolts are threaded with fastening nuts. The fastening nuts are pressed against the upper end plate 4 through washers, so as to realize the fastening connection between the composite leaf spring, the upper end plate 4 and the lower end plate 5.

[0036] Reference Figure 2 and Figure 3 Specifically, the metal frame 2 includes an inverted U-shaped upper clamping plate 21 and a lower clamping plate 22. The lower clamping plate 22 is supported at the bottom opening of the inverted U-shaped upper clamping plate 21 to form a ring-shaped metal frame 2.

[0037] Reference Figure 2 and Figure 3 The inverted U-shaped upper clamping plate 21 has an inverted U-shaped structure and is made of steel through a bending process. The inverted U-shaped upper clamping plate 21 includes a horizontal part, and two lateral parts are formed by bending on both sides of the horizontal part. Both ends of the horizontal part at the top of the inverted U-shaped upper clamping plate 21 are provided with glue injection notches 210.

[0038] Reference Figure 2 and Figure 3 The lower clamping plate 22 has a flat plate structure. Limiting notches 211 are provided on both sides of the bottom of the inverted U-shaped upper clamping plate 21, corresponding to the lower clamping plate 22. The lower clamping plate 22 is embedded within the limiting notches 211 on both sides, using the limiting notches 211 to laterally position the lower clamping plate 22, preventing lateral misalignment or displacement during assembly and under stress. A limiting protrusion 212 protrudes downward from the limiting notch 211 onto the lower clamping plate 22, located in the middle of the limiting notch 211. Limiting grooves 222 are provided on both sides of the lower clamping plate 22 corresponding to the limiting protrusions 212, and the shape and size of the limiting grooves 222 match the limiting protrusions 212. The limiting protrusion 212 engages with the corresponding limiting groove 222 to further limit the longitudinal movement of the lower clamping plate 22. This helps to enhance the connection stability between the inverted U-shaped upper clamping plate 21 and the lower clamping plate 22, and limits the relative movement between the lower clamping plate 22 and the inverted U-shaped upper clamping plate 21 when the metal frame 2 is subjected to force. This allows the torque on the frame to be better applied to the composite leaf spring body 1 through the metal frame 2.

[0039] Reference Figure 2 and Figure 3 Both ends of the lower clamping plate 22 are formed with deformation ramps 221, which extend downwards at an angle away from the lower clamping plate 22. When the composite leaf spring body 1 is subjected to force and undergoes reverse bending deformation, the deformation ramps 221 provide sufficient deformation clearance space for the polyurethane colloid 3 between the metal frame 2 and the composite leaf spring body 1, allowing the polyurethane colloid 3 to have enough space to stretch. This avoids excessive compression, stress concentration, or shear damage at the end of the lower clamping plate 22 when the polyurethane colloid 3 is subjected to bending and compression by the leaf spring, thereby ensuring that the polyurethane colloid 3 can maintain stable buffering, shock absorption, and wear resistance under long-term alternating loads.

[0040] Reference Figure 2 and Figure 3 Both the inverted U-shaped upper clamping plate 21 and the lower clamping plate 22 have positioning pins 20 on opposite sides. The positioning pins 20 are used to connect to pre-set holes on the frame to quickly position the composite leaf spring body 1, facilitating its installation. Specifically, the positioning pins 20 pass through the corresponding inverted U-shaped upper clamping plate 21 and lower clamping plate 22, and transitionally engage with them to achieve a stable connection between the positioning pins 20 and the metal frame 2.

[0041] A method for manufacturing a cushioning and damping structure of composite leaf springs as described above includes the following steps: S1: Assembly of metal frame 2: The top of the inverted U-shaped upper clamping plate 21 and the lower clamping plate 22 are assembled to the outer periphery of the composite leaf spring body 1 by using glue injection tooling to form a metal frame 2 fitted on the outer periphery of the composite leaf spring body 1.

[0042] Reference Figure 4 and Figure 5 The glue injection fixture includes a U-shaped limiting plate 6, two U-shaped support blocks 7, and two inverted U-shaped snap-fit ​​blocks 8.

[0043] Reference Figure 4 and Figure 5 The U-shaped limiting plate 6 is made of steel and is used for the lower clamping plate 22, the inverted U-shaped upper clamping plate 21 and the two U-shaped limiting plates 6 to be embedded in, so as to limit the lower clamping plate 22, the inverted U-shaped upper clamping plate 21 and the U-shaped support block 7.

[0044] Reference Figure 4 and Figure 5 The U-shaped limiting plate 6 has threaded bolts on both sides. The bolts are used to clamp the inverted U-shaped upper clamping plate 21 to limit its movement.

[0045] Reference Figure 4 and Figure 5The U-shaped support block 7 is made of nylon, and the size of the U-shaped groove is adapted to the cross-section of the composite leaf spring body 1, so as to allow the composite leaf spring to be embedded for support and positioning. In this embodiment, the U-shaped support block 7 and the U-shaped limiting plate 6 are configured for transitional fit.

[0046] Reference Figure 4 and Figure 5 The inverted U-shaped snap-fit ​​block 8 is made of nylon material. The size of the U-shaped groove is adapted to the cross-section of the composite leaf spring body 1. The inverted U-shaped snap-fit ​​block 8 can be connected with the U-shaped support block 7 to form a ring structure. An inverted U-shaped sleeve plate 81 is integrally formed at the end of the inverted U-shaped snap-fit ​​block 8. The inner contour of the inverted U-shaped sleeve plate 81 is adapted to the outer contour of the end of the inverted U-shaped upper clamping plate 21. The inverted U-shaped sleeve plate 81 is used to fit the top end of the inverted U-shaped upper clamping plate 21 to cover the glue injection notch 210. A through hole 80 (diameter of 10mm) is opened on the inverted U-shaped sleeve plate 81, and the position of the through hole 80 corresponds to the glue injection notch 210 of the inverted U-shaped upper clamping plate 21.

[0047] Reference Figure 4 and Figure 5 The surfaces of the U-shaped limiting plate 6, the two U-shaped support blocks 7, and the two inverted U-shaped snap-fit ​​blocks 8 are all coated with polyurethane release agent.

[0048] Reference Figure 2 and Figure 4 The specific steps of step S1 are as follows: S1.1: Insert the lower clamping plate 22 into the U-shaped limiting plate 6, adjust the position of the lower clamping plate 22 to ensure that the lower clamping plate 22 fits tightly against the groove wall of the U-shaped limiting plate 6 without loosening.

[0049] S1.2: The two U-shaped support blocks 7 are respectively embedded at both ends of the U-shaped limiting plate 6. During installation, the U-shaped support blocks 7 are tapped with the help of a rubber hammer to ensure that the bottom and sides of the U-shaped support blocks 7 are in contact with the inner side of the U-shaped limiting plate 6.

[0050] S1.3: Embed the composite leaf spring body 1 into the U-shaped grooves of the two U-shaped support blocks 7 to ensure that the composite leaf spring body 1 fits against the groove wall of the U-shaped support block 7.

[0051] S1.4: The inverted U-shaped upper clamping plate 21 is sleeved on the outer periphery of the composite leaf spring body 1, and the limiting grooves 222 on both sides of the inverted U-shaped upper clamping plate 21 are engaged with the lower clamping plate 22 to complete the assembly of the metal frame 2. The annular gap between the metal frame 2 and the composite leaf spring body 1 is formed by using the U-shaped limiting plate 6 and the two U-shaped support blocks 7.

[0052] S1.5: Insert the two inverted U-shaped snap-fit ​​blocks 8 into the composite leaf spring bodies 1 located at both ends of the inverted U-shaped upper clamping plate 21, and align the inverted U-shaped snap-fit ​​blocks 8 with the corresponding U-shaped support blocks 7; at the same time, fit the inverted U-shaped sleeve plate 81 at the end of the inverted U-shaped snap-fit ​​block 8 onto the end of the inverted U-shaped upper clamping plate 21, aligning the through hole 80 on the inverted U-shaped sleeve plate 81 with the glue injection notch 210 of the inverted U-shaped upper clamping plate 21; move the inverted U-shaped snap-fit ​​block 8 and the U-shaped support block 7 so that the two are in contact with the end of the inverted U-shaped upper clamping plate 21, and use the annular structure formed by the inverted U-shaped snap-fit ​​block 8 and the U-shaped support block 7 to seal the end opening of the annular gap between the metal frame 2 and the composite leaf spring body 1, so as to prevent the polyurethane glue 3 from overflowing from the end opening of the annular gap during subsequent glue injection.

[0053] In the actual assembly process, the inverted U-shaped socket plate 81 and the inverted U-shaped upper clamp plate 21 can be transitionally fitted; or the inverted U-shaped socket plate 81 and the inverted U-shaped upper clamp plate 21 can be fixed a second time with foam adhesive to ensure the tightness of the connection between the inverted U-shaped socket plate 81 and the inverted U-shaped upper clamp plate 21.

[0054] S2: Polyurethane Glue 3 Filling: Polyurethane glue 3 is filled into the annular gap between the metal frame 2 and the composite leaf spring body 1 using a glue injection tool. (Refer to...) Figure 4 and Figure 5 The specific steps are as follows: S2.1: Connect the two inverted U-shaped socket plates 81 to the glue injection equipment and the vacuum equipment respectively through the through holes 80. S2.2: While injecting polyurethane colloid 3 into the injection notch 210 at one end of the metal frame 2 using the injection equipment, a vacuum is drawn inside the metal frame 2 using a vacuum pump to quickly expel the air in the annular gap between the metal frame 2 and the composite leaf spring body 1. This effectively prevents the formation of air bubbles, voids, or inclusions inside the polyurethane colloid 3 injected into the annular gap, allowing the injected polyurethane colloid 3 to fully and evenly fill the entire annular gap, thereby improving the density and structural stability of the polyurethane colloid 3.

[0055] S3: Remove the glue injection fixture: Refer to... Figure 4 and Figure 5 The specific steps are as follows: S3.1: Remove the inverted U-shaped clips 8 at both ends of the inverted U-shaped upper clamping plate 21; S3.2: Unscrew the bolts on both sides of the U-shaped limiting plate 6 and remove the U-shaped limiting plate 6; S3.3: Remove U-shaped support block 7.

[0056] This application uses polyurethane colloid 3 as a transition buffer between the metal frame 2 and the composite leaf spring body 1. By utilizing the stable elasticity and buffering performance of polyurethane colloid 3, the failure of the transition buffer under long-term load and overload conditions is effectively avoided, reducing direct friction and wear between the metal frame 2 and the composite leaf spring body 1. The polyurethane colloid 3 achieves a stable connection between the metal frame 2 and the composite leaf spring body 1, restricting relative movement between the metal frame 2 and the composite leaf spring when subjected to force, and facilitating better application of subsequent external loads to the composite leaf spring body 1 through the metal frame 2.

[0057] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A cushioning and damping structure for a composite leaf spring, comprising a composite leaf spring body (1), a metal frame (2), and a transition buffer; characterized in that: The metal frame (2) is sleeved on the outer periphery of the composite leaf spring body (1). The metal frame (2) is formed by splicing an inverted U-shaped upper clamping plate (21) and a lower clamping plate (22). An annular gap is left between the inner periphery of the metal frame (2) and the outer periphery of the composite leaf spring body (1). The transition buffer includes a polyurethane colloid (3) filling the annular gap. The inverted U-shaped upper clamp (21) and the lower clamp (22) are both bonded and fixed to the outer periphery of the composite leaf spring body (1) by the polyurethane colloid (3).

2. The cushioning and shock-absorbing structure of a composite leaf spring according to claim 1, characterized in that: The inverted U-shaped upper clamp (21) includes two side portions, and the bottom of each side portion has a limiting notch (211) corresponding to the lower clamp (22). The lower clamp (22) is embedded in the limiting notch (211) of the two side portions.

3. The cushioning and shock-absorbing structure of a composite leaf spring according to claim 2, characterized in that: The limiting notch (211) is provided with a limiting protrusion (212) corresponding to the lower clamping plate (22). Both sides of the lower clamping plate (22) are provided with limiting grooves (222) corresponding to the limiting protrusions (212). The limiting protrusions (212) are embedded in the corresponding limiting grooves (222).

4. The cushioning and shock-absorbing structure of a composite leaf spring according to claim 1, characterized in that: Both ends of the lower clamping plate (22) are formed with deformable inclined surfaces (221), which extend downwards at an angle away from the lower clamping plate (22).

5. A method for manufacturing a cushioning and damping structure of a composite leaf spring as described in any one of claims 1 to 4, characterized in that: Includes the following steps: S1: Metal frame (2) assembly: The inverted U-shaped upper clamping plate (21) and lower clamping plate (22) are assembled to the outer periphery of the composite leaf spring body (1) by using glue injection tooling to form a metal frame (2) fitted on the outer periphery of the composite leaf spring body (1). S2: Polyurethane colloid (3) filling: Polyurethane colloid (3) is filled into the annular gap between the metal frame (2) and the composite leaf spring body (1) through the glue injection tool. S3: Remove the glue injection fixture.

6. The method for manufacturing a composite leaf spring buffer and shock absorption structure according to claim 5, characterized in that: Both ends of the top of the inverted U-shaped upper clamping plate (21) are provided with glue injection notches (210); The glue injection fixture includes a U-shaped limiting plate (6), a U-shaped support block (7), and an inverted U-shaped snap-fit ​​block (8). The U-shaped limiting plate (6) is used for the bottom of the U-shaped support block (7), the lower clamping plate (22) and the inverted U-shaped upper clamping plate (21) to be embedded; The U-shaped support block (7) is provided in two places, and the U-shaped support block (7) is used for the composite leaf spring body (1) to be embedded; The inverted U-shaped snap-fit ​​block (8) is provided in two places. The inverted U-shaped snap-fit ​​block (8) is used for the composite leaf spring body (1) to be embedded. The inverted U-shaped snap-fit ​​block (8) can be docked with the U-shaped support block (7) to form an annular structure sleeved on the outer periphery of the composite leaf spring body (1). The specific steps of step S1 are as follows: S1.1: The lower clamping plate (22) is embedded in the U-shaped limiting plate (6); S1.2: The two U-shaped support blocks (7) are respectively embedded at both ends of the U-shaped limiting plate (6); S1.3: Embed the composite leaf spring body (1) into the two U-shaped support blocks (7); S1.4: Fit the inverted U-shaped upper clamp (21) onto the outer periphery of the composite leaf spring body (1), and embed the bottom end of the inverted U-shaped upper clamp (21) into the U-shaped limiting plate (6); S1.5: Insert the two inverted U-shaped snap-fit ​​blocks (8) into the composite leaf spring body (1) located at both ends of the inverted U-shaped upper clamping plate (21), and make the two inverted U-shaped snap-fit ​​blocks (8) connect with the two U-shaped support blocks (7) respectively to block the openings at both ends of the annular gap between the composite leaf spring body (1) and the metal frame (2); The specific steps of step S2 are as follows: inject glue into the annular gap between the composite leaf spring body (1) and the metal frame (2) through the glue injection notch (210) on the inverted U-shaped upper clamping plate (21).

7. A method for manufacturing a composite leaf spring buffer and shock absorption structure according to claim 6, characterized in that: Each end of the inverted U-shaped snap-fit ​​block (8) is provided with an inverted U-shaped sleeve plate (81). The inverted U-shaped sleeve plate (81) is used to sleeve the end of the inverted U-shaped upper clamp plate (21) to cover the glue injection notch (210). The inverted U-shaped sleeve plate (81) is provided with a through hole (80) corresponding to the glue injection notch (210). In step S1.5, while inserting the inverted U-shaped snap-fit ​​block (8) into the composite leaf spring body (1), the inverted U-shaped sleeve plate (81) is sleeved on the end of the inverted U-shaped upper clamp plate (21).

8. A method for manufacturing a composite leaf spring buffer and shock absorption structure according to claim 5, characterized in that: In step S2, the through holes (80) on the two inverted U-shaped socket plates (81) are connected to the glue injection equipment and the vacuum equipment respectively; while injecting polyurethane glue (3) into the metal frame (2) through the glue injection equipment, the vacuum equipment is used to evacuate the metal frame (2).

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