A wide-body truck leaf spring assembly

Abstract

The utility model provides a wide body truck steel plate spring assembly, including first steel plate spring, both ends of first steel plate spring are provided with the ear, the lower part of first steel plate spring is provided with at least one second steel plate spring, and the one end of second steel plate spring adjacent to first steel plate spring is provided with the ear, and the other end of second steel plate spring is provided with the extension plate, the utility model discloses at least one second steel plate spring is equipped in the lower part of first steel plate spring, and the U type ear of one end of adjacent second steel plate spring is wrapped end portion, and the extension plate is equipped at the other end and exceeds the end of first steel plate spring, the design expands the effective length of second steel plate spring, realizes the independent work of first steel plate spring when light load and keeps comfortable, and the second steel plate spring intervention enhances the stiffness when heavy load, and the dynamic regulation stiffness significantly improves the upper limit of bearing.

Description

Technical Field

[0001] This utility model relates to the field of truck leaf spring technology, specifically to a leaf spring assembly for a wide-body truck. Background Technology

[0002] In the field of automotive leaf spring manufacturing, wide-body trucks are an important transportation tool in the modern logistics industry. With the booming development of the logistics industry, their market demand continues to grow. As a key component of the suspension system of wide-body trucks, leaf springs play a vital role in the vehicle's load-bearing capacity, driving stability, and comfort.

[0003] Currently, the market demand for high-quality, high-performance leaf springs for wide-body trucks is growing rapidly. However, the production capacity and product quality of existing manufacturers vary, which cannot fully meet market demand. Existing leaf springs are insufficient in terms of strength, fatigue life, shock absorption performance and reliability, making it difficult to meet the needs of vehicles under complex working conditions.

[0004] Meanwhile, different wide-body truck manufacturers have different requirements for the specifications and performance of leaf springs, and the aftermarket also needs diversified products to meet the needs of different customers. However, in the existing technology, the structural design of leaf springs is relatively traditional, making it difficult to achieve customized production and unable to adapt well to the diversified needs of the market. Utility Model Content

[0005] In view of this, the present invention provides a leaf spring assembly for wide-body trucks, which can be achieved by providing at least one second leaf spring below the first leaf spring, with a U-shaped lug at one end of the adjacent second leaf spring and an extension plate at the other end extending beyond the end of the first leaf spring. This design expands the effective working length of the second leaf spring, enabling the first leaf spring to work independently to ensure comfort under light loads, and the second leaf spring to intervene and enhance stiffness under heavy loads, dynamically adjusting stiffness and significantly increasing the upper limit of load capacity.

[0006] To solve the above-mentioned technical problems, this utility model provides a leaf spring assembly for a wide-body truck, including a first leaf spring, both ends of which are provided with lugs for connecting to the vehicle frame suspension system.

[0007] At least one second leaf spring is provided at the lower part of the first leaf spring to form a combination structure of the first and second leaf springs. One end of the second leaf spring adjacent to the first leaf spring is provided with a lug. The lug has a U-shaped structure and wraps around the end of the spring. The other end of the second leaf spring is provided with an extension plate. The extension plate extends outward along the length of the second leaf spring and extends beyond the end of the first leaf spring.

[0008] The connection between the two ends of the first leaf spring and the lug is an arc-shaped transition structure, which reduces stress concentration through a smooth transition.

[0009] The connection between the second leaf spring adjacent to the first leaf spring and the lug is an arc-shaped transition structure, and the connection between the second leaf spring and the extension plate is also an arc-shaped transition structure, ensuring the fatigue resistance of the leaf spring under alternating loads.

[0010] The first leaf spring and the second leaf spring are connected by a fixing bolt. The fixing bolt passes vertically through the center of the first leaf spring and the second leaf spring. The bolt hole edge is countersunk and chamfered, and a butterfly spring washer is used to achieve pre-tightening to ensure that the first and second leaf springs are subjected to force together.

[0011] The lower part of the second leaf spring is provided with a coiled end piece, the end of which adopts an inwardly coiled structure to enhance the support stiffness and wear resistance of the leaf spring end.

[0012] Both the first and second leaf springs have rib grooves pressed on their upper surfaces, parallel to the length of the leaf spring. The cross-section of the rib grooves is trapezoidal, which is used to enhance the deformation resistance of the upper surface of the leaf spring, reduce interlayer slippage, and optimize load distribution.

[0013] The beneficial effects of the above-mentioned technical solution of this utility model are as follows:

[0014] 1. The second leaf spring adjacent to the first leaf spring adopts a special coiled ear and compression groove structure, which improves vehicle safety. The ends of the remaining leaf springs are rolled and have compression grooves to ensure a tight fit between the leaf springs, avoiding misalignment of the leaf springs in complex road conditions that could affect vehicle safety, while also reducing weight. This helps improve the vehicle's fuel economy and transportation efficiency.

[0015] 2. High-performance leaf springs have higher strength, better fatigue life, better damping performance and reliability to meet the needs of vehicles under complex working conditions.

[0016] 3. Cooperative force sharing of the first and second leaf springs: At least one second leaf spring is set below the first leaf spring to form a combination structure of the first and second leaf springs. One end of the second leaf spring adjacent to the first leaf spring is provided with a U-shaped lug to wrap around the end, and the other end is provided with an extension plate that extends beyond the end of the first leaf spring. By expanding the effective working length of the second leaf spring, the first leaf spring can work independently to ensure comfort under light load, and the second leaf spring can intervene to enhance stiffness under heavy load, forming dynamic stiffness adjustment under different loads, which significantly improves the upper limit of the load capacity of the assembly.

[0017] 4. End rigid reinforcement: The wrap-around design of the ear rigidly reinforces the end of the second leaf spring to the external connection point, avoiding breakage due to stress concentration at the end under alternating loads. At the same time, it makes the first and second leaf springs form a tight mechanical coupling at the connection end, ensuring synchronous deformation and improving the overall load-bearing efficiency.

[0018] 5. Arc-shaped transition structure to improve fatigue resistance: The connection between the first leaf spring and the lug, the second leaf spring and the lug and the extension plate all adopt an arc-shaped transition structure. The smooth geometric design disperses the stress peak, reduces the risk of fatigue cracks caused by high-frequency vibration under complex working conditions, and extends the service life of the leaf spring assembly.

[0019] 6. Pre-tightening of the center bolt and optimization of load distribution: The first and second leaf springs are connected by a fixing bolt that passes vertically through the center. The bolt hole edge is countersunk and chamfered, and the butterfly spring washer is used for pre-tightening to ensure that the first and second leaf springs are subjected to force together and to avoid load transfer failure caused by interlayer slippage. At the same time, the load in the width direction is evenly distributed to resist the loosening tendency under alternating loads. Compared with traditional riveting connections, it is easier to disassemble and maintain.

[0020] 7. End support and wear resistance: The lower part of the second leaf spring is equipped with a coiled end piece. The inwardly coiled structure at the end enhances the end support stiffness of the leaf spring, reduces wear caused by excessive bending under heavy load and long-term friction, and improves end reliability.

[0021] 8. Setting reinforcement grooves to enhance performance: Trapezoidal reinforcement grooves parallel to the length direction are pressed on the upper surface of the first and second leaf springs to increase the moment of inertia of the cross section to resist bending deformation and maintain structural stability; at the same time, the interlocking structure is formed to increase interlayer friction, suppress relative sliding, ensure coordinated force, and avoid load transfer failure and local wear aggravation. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the overall bottom view of the present invention;

[0024] Figure 3 This is another overall structural schematic diagram of the present invention.

[0025] In the diagram: 101, first leaf spring; 102, coil lug; 103, second leaf spring; 104, wrap lug; 105, extension plate;

[0026] 201. Fixing bolts;

[0027] 301. With rolled end sheet;

[0028] 401. Rib groove. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the following will be described in conjunction with the accompanying drawings of the embodiments of this utility model. Figure 1-3The technical solutions of the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model are within the protection scope of this utility model.

[0030] A leaf spring assembly for a wide-body truck, such as Figure 1 As shown: It includes a first leaf spring 101, and both ends of the first leaf spring 101 are provided with lugs 102. Wear-resistant bushings are embedded in the lugs 102 at both ends for connecting with the vehicle frame suspension system and connecting with the vehicle frame through pins.

[0031] In this embodiment, the axial distance between the two end lugs 102 is set to 1900±3mm.

[0032] like Figure 1 , 2 As shown: At least one second leaf spring 103 is provided at the lower part of the first leaf spring 101 to form a combination structure of the first and second leaf springs. In this embodiment, the second leaf springs 103 are stacked to form seven pieces.

[0033] The second leaf spring 103, which is adjacent to the first leaf spring 101, has a lug 104 at one end. The lug 104 has a U-shaped structure and wraps around the end of the spring. The lug 104 is a recessed lug. By wrapping the end of the second leaf spring 103 adjacent to the first leaf spring 101, the connection point between the end of the second leaf spring 103 and the external structure (such as the vehicle frame suspension system or other leaf spring components) is rigidly reinforced through the wrapping design. This prevents the second leaf spring 103 from breaking due to stress concentration at the end under alternating loads and improves the fatigue resistance of the overall structure.

[0034] The wrapping structure of the lug 104 enables the second leaf spring 103 and the first leaf spring 101 to form a tighter mechanical coupling at the connection end, ensuring that the first and second leaf springs can deform synchronously under load. This prevents uneven stress on the second leaf spring 103 due to loosening at the end, thereby improving the overall load-bearing efficiency of the leaf spring assembly.

[0035] like Figure 1 , 2 As shown: The other end of the second leaf spring 103 is provided with an extension plate 105, which extends outward along the length direction of the second leaf spring 103 and extends beyond the end of the first leaf spring 101.

[0036] The extension plate 105 extends outward along the length of the second leaf spring 103 and beyond the end of the first leaf spring 101. By increasing the effective working length of the second leaf spring 103, the load originally concentrated at the end of the first leaf spring 101 is transferred to the extension area of ​​the second leaf spring 103, thereby expanding the force-bearing area and reducing the load pressure per unit area. Especially under heavy load conditions, it can significantly improve the load-bearing capacity of the leaf spring assembly.

[0037] The design of the extension plate 105 extending beyond the end of the first leaf spring 101 allows the second leaf spring 103 to participate in the stress earlier during the deformation process of the leaf spring assembly (such as when the vehicle is heavily loaded). Through the superposition effect of the stiffness of the first and second leaf springs, the stiffness of the leaf spring assembly can be dynamically adjusted under different loads: under light load, the first leaf spring 101 works independently to ensure comfort; under heavy load, the second leaf spring 103 intervenes through the extension plate 105 to enhance stiffness and support a larger load.

[0038] like Figure 1 , 2 As shown: The connection between the two ends of the first leaf spring 101 and the lug 102 is an arc-shaped transition structure, which reduces stress concentration through a smooth transition.

[0039] The connection between the coiled ear 102 and the first leaf spring 101 adopts an arc-shaped transition structure. The smooth arc-shaped transition structure reduces the risk of fatigue cracks caused by stress concentration (such as overall bending stress caused by compression or tension of the leaf spring).

[0040] The connection between the second leaf spring 103, which is adjacent to the first leaf spring 101, and the lug 104 is an arc-shaped transition structure.

[0041] The connection between the lug 104 and the second leaf spring 103 adopts an arc-shaped transition structure, which, combined with the smooth geometric design, effectively disperses the stress peak at the end connection and reduces the risk of fatigue cracks caused by stress concentration. It is especially suitable for wide-body trucks in high-frequency vibration conditions under complex road conditions, and extends the service life of the leaf spring assembly.

[0042] like Figure 1 , 2 As shown: The connection between the second leaf spring 103 and the extension plate 105 is an arc-shaped transition structure to ensure the fatigue resistance of the leaf spring under alternating loads.

[0043] like Figure 1 , 3 As shown: The first leaf spring 101 and the second leaf spring 103 are connected by a fixing bolt 201. The fixing bolt 201 passes vertically through the center of the first leaf spring 101 and the second leaf spring 103. The bolt hole edge is provided with a countersunk chamfer, which, together with the butterfly spring washer, achieves pre-tightening to ensure that the first and second leaf springs are subjected to force in a coordinated manner.

[0044] The fixing bolt 201 penetrates vertically through the center of the first leaf spring 101 and the second leaf spring 103, and the first and second leaf springs are rigidly connected into a whole by the bolt preload, so that the two deform synchronously when bearing load, avoiding load transfer failure caused by interlayer slippage.

[0045] The bolt hole edges are countersunk and chamfered to avoid stress concentration caused by right-angled edges. Combined with the elastic preload of the disc spring washer, it can absorb the vibration energy during vehicle operation and prevent bolt loosening and hole edge cracking.

[0046] A fixing bolt 201 is set in the center to distribute the load evenly along the width of the leaf spring, avoiding local overload caused by offset installation. The pre-tightening design of the fixing bolt 201 (with butterfly washers) can resist the loosening tendency under alternating loads, and is easier to disassemble and maintain than traditional rivet connections.

[0047] like Figure 2 , 3 As shown: The lower part of the second leaf spring 103 is provided with a coiled end piece 301. The end of the coiled end piece 301 adopts an inwardly coiled structure to enhance the support stiffness and wear resistance of the leaf spring end.

[0048] The rolled end piece 301 is fixed to the lower part of the second leaf spring 103 with an inward rolled structure. Its rigid extension part can support the end of the leaf spring and reduce excessive bending of the end under heavy load.

[0049] The extension plate 105, in conjunction with the coiled end piece 301 (inwardly coiled structure) at the lower part of the second leaf spring 103, further enhances the support stiffness of the leaf spring end, reduces wear caused by long-term friction or deformation, and at the same time, the rigid extension of the extension plate 105 prevents excessive bending or deformation of the end of the second leaf spring 103 under stress, thus improving the reliability of the leaf spring assembly.

[0050] like Figure 1 , 3 As shown: The upper surfaces of the first leaf spring 101 and the second leaf spring 103 are both pressed with a rib groove 401 parallel to the length direction of the leaf spring. The cross-section of the rib groove 401 is trapezoidal, which is used to enhance the deformation resistance of the upper surface of the leaf spring, reduce interlayer slippage and optimize load distribution.

[0051] The rib groove 401, through its trapezoidal cross-section design, increases the moment of inertia of the upper surface of the leaf spring, thereby enhancing its ability to resist bending deformation. When wide-body trucks are subjected to heavy loads or impacts from complex road conditions, the rib groove 401 can reduce excessive bending or deformation of the leaf spring caused by vertical loads, maintain the stability of the overall structure of the leaf spring, and extend its service life.

[0052] The presence of the trapezoidal pressure groove 401 creates a concave-convex interlocking structure on the contact surfaces between the layers of the leaf spring, increasing the interlayer friction. When the leaf spring deforms under load, the pressure groove 401 can suppress the relative sliding between the layers of steel plates, ensuring that the first and second leaf springs 103 work together to bear the force, avoiding load transmission failure or increased local wear caused by interlayer sliding, and improving the reliability of the leaf spring assembly.

[0053] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0054] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A leaf spring assembly for a wide-body truck, characterized in that: Includes a first leaf spring (101), both ends of which are provided with lugs (102); At least one second leaf spring (103) is provided at the lower part of the first leaf spring (101). One end of the second leaf spring (103) adjacent to the first leaf spring (101) is provided with a lug (104), and the other end of the second leaf spring (103) is provided with an extension plate (105).

2. The leaf spring assembly for wide-body trucks as described in claim 1, characterized in that: The connection between the two ends of the first leaf spring (101) and the lug (102) is an arc-shaped transition structure.

3. The leaf spring assembly for wide-body trucks as described in claim 1, characterized in that: The connection between the second leaf spring (103) adjacent to the first leaf spring (101) and the lug (104) is an arc-shaped transition structure; The connection between the second leaf spring (103) and the extension plate (105) is an arc-shaped transition structure.

4. The leaf spring assembly for wide-body trucks as described in claim 1, characterized in that: The first leaf spring (101) and the second leaf spring (103) are connected by a fixing bolt (201).

5. The leaf spring assembly for wide-body trucks as described in claim 4, characterized in that: The fixing bolt (201) is located at the center of the first leaf spring (101) and the second leaf spring (103).

6. The leaf spring assembly for wide-body trucks as described in claim 1, characterized in that: The second leaf spring (103) is provided with a coiled end piece (301) at its lower part.

7. The leaf spring assembly for wide-body trucks as described in claim 1, characterized in that: The upper surfaces of the first leaf spring (101) and the second leaf spring (103) are both pressed with rib grooves (401).

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