Commercial vehicle rear suspension system

Abstract

The application discloses a commercial vehicle rear suspension system and relates to the technical field of automobiles, which comprises a vehicle frame, plate spring bearing systems arranged on the two sides of the vehicle frame, the plate spring bearing systems being fixedly connected with the vehicle frame through upper lifting lugs, a vehicle axle arranged at the bottom of the vehicle frame, a shock absorber system connected between the vehicle axle and the vehicle frame, the upper end of the shock absorber system being connected with the vehicle frame through a shock absorber support, a stabilizer bar system arranged below the vehicle frame, one end of the stabilizer bar system being fixedly connected with the plate spring bearing system, and the other end of the stabilizer bar system being fixedly connected with the upper lifting lugs. The plate spring bearing system is fixedly connected with the vehicle frame through the upper lifting lugs, the distance between the vehicle wheel and the vehicle frame is reduced, the overall height of the vehicle is reduced, and the steering stability of the vehicle is improved. One end of the stabilizer bar system is assembled to the plate spring bearing system, and the other end of the stabilizer bar system is assembled to the lower end of the upper lifting lugs, the number of parts is reduced, the overall weight of the vehicle is reduced, and the assembly process and the economy of the vehicle are better.

Description

Technical Field

[0001] This invention relates to the field of automotive technology, and more specifically to a rear suspension system for commercial vehicles. Background Technology

[0002] Commercial vehicles are automobiles designed and technically characterized for transporting people and goods. They encompass all freight vehicles and buses with more than nine seats, categorized into five types: buses, trucks, semi-trailer tractors, incomplete bus vehicles, and incomplete truck vehicles. In the industry media, the concept of commercial vehicles is primarily defined by their intended use, conventionally dividing them into two main categories: buses and trucks. Common commercial vehicle models include: pickup trucks, mini-trucks, light trucks, minibuses, dump trucks, cargo trucks, tractors, trailers, and special-purpose vehicles.

[0003] The suspension system is a crucial component of a vehicle. It not only affects ride comfort (smoothness) but also significantly impacts other performance aspects such as handling, stability, and traction. Currently, the rear suspension system of commercial vehicles primarily consists of a leaf spring load-bearing system, a shock absorber system, and a stabilizer bar system. Typically, the leaf springs use a lower-mounted coil spring. The shock absorber system and stabilizer bar system are assembled using separate brackets, usually with the shock absorber system at the front and the stabilizer bar system at the rear. The stabilizer bar system comprises: the stabilizer bar assembly, stabilizer bar hangers, stabilizer bar hanger brackets, and axle mounting brackets.

[0004] The existing technology has the following problems:

[0005] (1) The leaf spring coil is placed at the bottom, which makes the height of the wheel to the frame too high, resulting in a high cargo box height and an increased center of gravity.

[0006] (2) The rear-mounted stabilizer bar system, the installation height of the stabilizer bar will affect the vehicle's passability.

[0007] (3) The integration of the stabilizer bar system and the suspension system is not high, there are many parts, poor manufacturability, heavy weight and high cost.

[0008] (4) The suspension system layout occupies a large space, which is not conducive to the modular layout of the whole vehicle. Summary of the Invention

[0009] The purpose of this invention is to provide a rear suspension system for commercial vehicles to solve at least one of the above-mentioned technical problems of existing commercial vehicle suspension systems.

[0010] To achieve the above objectives, the present invention provides a rear suspension system for a commercial vehicle, including a frame. Leaf spring support systems are provided on both sides of the frame, and these systems are fixedly connected to the frame via upper hangers. An axle is provided at the bottom of the frame, and a shock absorber system is connected between the axle and the frame. The upper end of the shock absorber system is connected to the frame via a shock absorber bracket. A stabilizer bar system is provided below the frame, with one end fixedly connected to the leaf spring support systems and the other end fixedly connected to the upper hangers.

[0011] This application utilizes leaf spring load-bearing systems on both sides of the vehicle frame to mitigate and absorb impacts and vibrations from the road surface encountered during vehicle operation, ensuring the transmission of various forces (thrust, braking force, etc.) and balancing and maintaining the adhesion and load between the wheels and the road surface within certain limits. A shock absorber system is installed between the axle and the frame to suppress the repeated bouncing caused by the leaf spring load-bearing system absorbing various impacts from the road surface, thereby accelerating the attenuation of the inherent vibrations of the leaf spring load-bearing system, providing better driving smoothness, mitigating road impacts, and quickly absorbing vibrations generated during bumps, allowing the vehicle to return to normal driving conditions. A stabilizer bar system is installed to maintain vehicle stability and prevent excessive body roll. A top-mounted hanger securely connects the leaf spring load-bearing system to the frame, reducing the distance between the wheels and the frame, lowering the overall vehicle height, and improving vehicle handling stability. One end of the stabilizer bar system is mounted to the leaf spring load-bearing system, and the other end is mounted to the lower end of the top-mounted hanger, reducing the number of parts and the overall vehicle weight, resulting in better assembly manufacturability and economy.

[0012] In a preferred implementation of a commercial vehicle rear suspension system

[0013] The leaf spring load-bearing system includes a leaf spring assembly. The front end of the leaf spring assembly is fixedly connected to the vehicle frame via a leaf spring front bracket. The leaf spring assembly is rotatably connected to the leaf spring front bracket. The rear end of the leaf spring assembly is rotatably connected to the upper mounting lug. The upper mounting lug is fixedly connected to the vehicle frame via a leaf spring rear bracket.

[0014] By incorporating a leaf spring load-bearing system, including a leaf spring assembly, the structure is simple, reliable, low-cost, and easy to maintain. The leaf spring assembly serves as both the elastic element and the guiding device of the suspension. Its front end is rotatably connected to the vehicle frame, transmitting various forces and torques and determining the wheel's trajectory. Simultaneously, the leaf spring assembly itself provides some friction and shock absorption. By rotatably connecting the rear end of the leaf spring assembly to the upper-mounted hanger, the problem of the existing technology's lower-mounted leaf spring assembly, resulting in excessive wheel-to-frame height and consequently a high cargo box and center of gravity, is solved. The rear leaf spring bracket not only securely connects the upper-mounted hanger to the frame but also facilitates the fixation of the stabilizer bar system. This eliminates the need for a separate hanger support structure, allowing the stabilizer bar system to be directly fixed to the rear leaf spring bracket, reducing the number of stabilizer bar components, lowering the overall vehicle weight, and improving assembly manufacturability and economy. Furthermore, the increased stabilizer bar height enhances the vehicle's ground clearance.

[0015] In a preferred implementation of a commercial vehicle rear suspension system

[0016] The lower end of the leaf spring assembly is provided with a stabilizer bar connector, and the stabilizer bar system is fixedly connected to the leaf spring load-bearing system through the stabilizer bar connector.

[0017] By incorporating a stabilizer bar connector to connect with the stabilizer bar system, this invention solves the problem in existing technologies where the stabilizer bar system is fixed to the lower end of the axle, resulting in an excessively low stabilizer bar height, which in turn leads to a low chassis, poor obstacle crossing performance, and poor off-road capability. Furthermore, existing technologies require a complex structure and high cost for the stabilizer bar system to be connected to the frame via a hanger bracket. This application, by incorporating a stabilizer bar connector at the lower end of the leaf spring assembly, increases the fixed height of the stabilizer bar system, improves the obstacle crossing performance and off-road capability of the vehicle chassis, simplifies the structure of the stabilizer bar system, and reduces manufacturing costs.

[0018] In a preferred implementation of a commercial vehicle rear suspension system

[0019] The stabilizer bar system includes a stabilizer bar body, and stabilizer bar brackets are provided at both ends of the stabilizer bar body. The stabilizer bar brackets are connected to the stabilizer bar connectors.

[0020] Furthermore, one end of the stabilizer bar bracket is rotatably connected to the stabilizer bar body, and the other end of the stabilizer bar bracket is rotatably connected to the stabilizer bar connector.

[0021] By setting the stabilizer bar system to include a stabilizer bar body and a stabilizer bar bracket, the structure of the stabilizer bar system is simplified and the manufacturing and assembly costs are reduced while still fulfilling the function of the vehicle stabilizer bar system.

[0022] Furthermore, the stabilizer support includes a connecting plate, with baffles vertically fixed on both sides of the connecting plate. The upper end of the baffle is rotatably connected to the stabilizer connector via fixing bolts and nuts, and the lower end of the baffle is rotatably connected to the stabilizer body via the fixing bolts and nuts.

[0023] The stabilizer bar bracket connects the stabilizer bar body and the stabilizer bar connector. The stabilizer bar bracket is equipped with a connecting plate, and baffles are provided on both sides of the connecting plate. The front end of the baffle is fixed to both sides of the stabilizer bar connector, and the rear end of the baffle is fixed to both sides of the front end of the stabilizer bar body. The connection is tightened with fixing bolts and nuts, which facilitates assembly, disassembly and maintenance.

[0024] In a preferred implementation of a commercial vehicle rear suspension system

[0025] The stabilizer bar is fixedly connected to the leaf spring rear bracket.

[0026] Furthermore, the lower end of the leaf spring rear bracket is provided with a connecting base, the connecting base is provided with an internal threaded hole, the stabilizer rod body is fitted with a cover plate, the cover plate is provided with a through hole corresponding to the internal threaded hole, and the bolt passes through the through hole and is tightened and fixedly connected to the internal threaded hole.

[0027] A connecting base is provided at the lower end of the leaf spring rear bracket to provide a connection position for fixing the stabilizer bar body. The connecting base has an internal threaded hole, and the stabilizer bar body has a rubber pad and a cover plate. The cover plate has a through hole corresponding to the internal threaded hole. The stabilizer bar body is fixedly connected to the leaf spring rear bracket by bolts passing through the through hole on the cover plate and tightening it with the internal threaded hole on the connecting base. This reduces the structure of the stabilizer bar system, lowers manufacturing costs, increases the height of the stabilizer bar system, improves the obstacle crossing ability of the vehicle chassis, and thus improves the vehicle's passability.

[0028] In a preferred implementation of a commercial vehicle rear suspension system

[0029] A rubber pad is fitted between the cover plate and the stabilizer bar.

[0030] By incorporating rubber pads at the connection between the cover plate and the stabilizer bar, the movement of the stabilizer bar is cushioned, preventing wear caused by the rigid connection between the stabilizer bar and the cover plate, which would affect the service life of both. During the movement of the stabilizer bar, the rubber pads cushion its motion, preventing structural wear between the stabilizer bar and the cover plate.

[0031] In a preferred implementation of a commercial vehicle rear suspension system

[0032] The rear support of the leaf spring is provided with a lifting lug connection hole. The lower end of the upper lifting lug is detachably fixedly connected to the lifting lug connection hole, and the upper end of the upper lifting lug is rotatably connected to the leaf spring assembly.

[0033] By providing a lug connection hole on the rear bracket of the leaf spring, the lower end of the upper lug is detachably connected to the lug connection hole, and the upper end of the upper lug is rotatably connected to the leaf spring assembly. This achieves the purpose of raising the fixed height of the leaf spring assembly, reducing the distance between the wheel and the frame, reducing the overall vehicle height, thereby lowering the vehicle's center of gravity and improving the vehicle's handling stability. Attached Figure Description

[0034] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0035] Figure 1 This is a schematic diagram of the overall structure of the suspension system in one embodiment of the present invention;

[0036] Figure 2 This is a schematic diagram of a stabilizer bar system and its cooperation structure with a leaf spring in one embodiment of the present invention;

[0037] Figure 3 This is a schematic diagram of the structure of the leaf spring rear support in one embodiment of the present invention.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1. Leaf spring assembly; 2. Front leaf spring bracket; 3. Frame; 4. Rear leaf spring bracket; 41. Connecting base; 42. Internal threaded hole; 43. Lifting lug connecting hole; 5. Shock absorber system; 6. Stabilizer bar bracket; 7. Stabilizer bar body; 8. Cover plate; 9. Rubber pad; 10. Top lifting lug; 11. U-bolt; 12. Axle; 13. Shock absorber bracket; 14. Stabilizer bar connector; 15. Fixing bolt; 16. Nut. Detailed Implementation

[0040] To more clearly illustrate the overall concept of the present invention, a detailed description will be provided below with reference to the accompanying drawings and examples.

[0041] It should be noted that many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0042] like Figure 1 , Figure 2 and Figure 3As shown, the present invention provides a rear suspension system for a commercial vehicle, including a frame 3. Leaf spring support systems are provided on both sides of the frame 3, and the leaf spring support systems are fixedly connected to the frame 3 via upper hangers 10. An axle 12 is provided at the bottom of the frame 3, and a shock absorber system 5 is connected between the axle 12 and the frame 3. The upper end of the shock absorber system 5 is connected to the frame 3 via a shock absorber bracket 13. A stabilizer bar system is provided below the frame 3, with one end fixedly connected to the leaf spring support system and the other end fixedly connected to the upper hangers 10.

[0043] This application incorporates leaf spring load-bearing systems on both sides of the chassis 3 to mitigate and absorb impacts and vibrations from the road surface encountered during vehicle operation, ensuring the transmission of various forces (thrust, braking force, etc.) and balancing and maintaining the adhesion and load between the wheels and the road surface within certain limits. A shock absorber system 5 is installed between the axle 12 and the chassis 3 to suppress repeated bouncing after the leaf spring load-bearing system absorbs various impacts from the road surface, thereby accelerating the attenuation of the inherent vibrations of the leaf spring load-bearing system, providing better driving smoothness, mitigating road impacts, and quickly absorbing vibrations generated during bumps, allowing the vehicle to return to normal driving conditions. A stabilizer bar system is installed to maintain vehicle stability and prevent excessive body roll. An upper-mounted hanger 10 is used to fix the leaf spring load-bearing system to the chassis 3, reducing the distance between the wheels and the chassis 3, lowering the overall vehicle height, and improving vehicle handling stability. One end of the stabilizer bar system is mounted to the leaf spring load-bearing system, and the other end is mounted to the lower end of the upper-mounted hanger 10, reducing the number of parts and the overall vehicle weight, resulting in better assembly manufacturability and economy. The leaf spring assembly 1 is fixed to the axle 12 by a plurality of U-bolts 11.

[0044] As a preferred embodiment of this application,

[0045] The leaf spring load-bearing system includes a leaf spring assembly 1. The front end of the leaf spring assembly 1 is fixedly connected to the vehicle frame 3 through a leaf spring front bracket 2. The leaf spring assembly 1 is rotatably connected to the leaf spring front bracket 2. The rear end of the leaf spring assembly 1 is rotatably connected to the upper hanging lug 10. The upper hanging lug 10 is fixedly connected to the vehicle frame 3 through a leaf spring rear bracket 4.

[0046] By setting up a leaf spring load-bearing system including a leaf spring assembly 1, the structure is simple, reliable, low-cost, and easy to maintain. The leaf spring assembly 1 is both the elastic element of the suspension and the guiding device of the suspension. The front end of the leaf spring assembly 1 is rotatably connected to the frame 3, which can transmit various forces and torques and determine the trajectory of the wheels. At the same time, the leaf spring assembly 1 itself also has a certain frictional damping effect. By rotatably connecting the rear end of the leaf spring assembly 1 to the upper mounting lug 10, the problem of excessive wheel height from the wheel to the frame 3, resulting in a high cargo box height and increased center of gravity, is solved in the prior art where the leaf spring assembly 1 has a lower mounting lug. By setting the leaf spring rear bracket 4, the upper mounting lug 10 is fixedly connected to the frame 3, and the fixation of the stabilizer bar system is facilitated. The stabilizer bar system can be directly fixed to the leaf spring rear bracket 4 without the need for a hanger support structure, reducing the number of stabilizer bar system components and the overall vehicle weight. This improves the vehicle's assembly processability and economy. At the same time, the height of the stabilizer bar system is increased, improving the vehicle chassis's passability.

[0047] As a preferred embodiment of this application,

[0048] The lower end of the leaf spring assembly 1 is provided with a stabilizer bar connector 14, and the stabilizer bar system is fixedly connected to the leaf spring bearing system through the stabilizer bar connector 14.

[0049] By connecting the stabilizer bar connector 14 to the stabilizer bar system, the problem of excessively low stabilizer bar height caused by the stabilizer bar system being fixed to the lower end of the axle 12 in the prior art, resulting in a low vehicle chassis, poor obstacle crossing performance, and poor passability, is solved. Furthermore, in the prior art, the stabilizer bar system is fixed to the bottom of the axle 12, requiring a hanger bracket to connect the stabilizer bar to the frame 3, which is structurally complex and costly. This application, by providing the stabilizer bar connector 14 at the lower end of the leaf spring assembly 1, increases the fixed height of the stabilizer bar system, improves the obstacle crossing performance and passability of the vehicle chassis, simplifies the structure of the stabilizer bar system, and reduces manufacturing costs.

[0050] In a preferred embodiment of this application, the stabilizer bar system includes a stabilizer bar body 7, and stabilizer bar brackets 6 are provided at both ends of the stabilizer bar body 7. The stabilizer bar brackets 6 are connected to the stabilizer bar connector 14.

[0051] Furthermore, one end of the stabilizer bar bracket 6 is rotatably connected to the stabilizer bar body 7, and the other end of the stabilizer bar bracket 6 is rotatably connected to the stabilizer bar connector 14.

[0052] By setting the stabilizer bar system to include a stabilizer bar body 7 and a stabilizer bar bracket 6, the structure of the stabilizer bar system is simplified and the manufacturing and assembly costs of the stabilizer bar system are reduced while still fulfilling the function of the vehicle stabilizer bar system.

[0053] It should be noted that this application does not impose specific limitations on the structure of the stabilizer bar bracket 6, and the preferred embodiment is as follows:

[0054] The stabilizer bracket 6 includes a connecting plate, and baffles are vertically fixed on both sides of the connecting plate. The upper end of the baffle is rotatably connected to the stabilizer connector 14 through fixing bolts 15 and nuts 16, and the lower end of the baffle is rotatably connected to the stabilizer body 7 through fixing bolts 15 and nuts 16.

[0055] The stabilizer bar bracket 6 connects the stabilizer bar body 7 and the stabilizer bar connector 14. The stabilizer bar bracket 6 is equipped with a connecting plate, and baffles are provided on both sides of the connecting plate. The front end of the baffle is fixed to both sides of the stabilizer bar connector 14, and the rear end of the baffle is fixed to both sides of the front end of the stabilizer bar body 7. The connection is tightened by fixing bolts 15 and nuts 16, which facilitates assembly, disassembly and maintenance.

[0056] It should be noted that this application does not impose specific limitations on the fixing method of the stabilizer bar 7, which can be any of the following embodiments:

[0057] Example 1:

[0058] The stabilizer bar 7 is fixedly connected to the lower end of the upper lifting lug 10, the upper end of the upper lifting lug 10 is rotatably connected to the leaf spring assembly 1, and the side of the upper lifting lug 10 is fixedly connected to the frame 3.

[0059] By raising the stabilizer bar body 7 and directly fixing it to the bottom of the lower mounting lug, the hanger structure in the existing stabilizer bar system is eliminated, simplifying the stabilizer bar system structure and reducing manufacturing costs. At the same time, raising the stabilizer bar body 7 solves the problem of the existing vehicle's stabilizer bar body being too low, making it easily damaged when encountering uneven road surfaces or obstacles. The increased height of the stabilizer bar body 7 above the ground reduces the likelihood of scratching the stabilizer bar when encountering obstacles, thus improving the stabilizer bar's lifespan and the vehicle's passability.

[0060] Example 2:

[0061] The upper end of the upper lifting lug 10 is rotatably connected to the leaf spring assembly 1, and the lower end of the upper lifting lug 10 is connected to the leaf spring rear bracket 4. The side of the leaf spring rear bracket 4 is detachably fixedly connected to the frame 3, and the stabilizer bar 7 is fixedly connected to the bottom of the leaf spring rear bracket 4.

[0062] Furthermore, the lower end of the leaf spring rear bracket 4 is provided with a connecting base 41, the connecting base 41 is provided with an internal threaded hole 42, the stabilizer rod body 7 is fitted with a cover plate 8, the cover plate 8 is provided with a through hole corresponding to the internal threaded hole 42, and the bolt passes through the through hole and is tightened and fixedly connected to the internal threaded hole 42.

[0063] Compared with Embodiment 1, this embodiment differs in that it includes an additional leaf spring rear bracket 4. A connecting base 41 is provided at the lower end of the leaf spring rear bracket 4 to provide a connection position for fixing the stabilizer bar 7. The connecting base 41 has an internal threaded hole 42, and the stabilizer bar 7 has a rubber pad 9 and a cover plate 8. The cover plate 8 has a through hole corresponding to the internal threaded hole 42. Bolts are passed through the through hole on the cover plate 8 and tightened with the internal threaded hole 42 on the connecting base 41 to fix the stabilizer bar 7 to the leaf spring rear bracket 4. This reduces the structure of the stabilizer bar system, lowers manufacturing costs, increases the height of the stabilizer bar system, improves the obstacle crossing ability of the vehicle chassis, and thus improves the vehicle's passability.

[0064] As a preferred embodiment of this application,

[0065] A rubber pad 9 is fitted between the cover plate 8 and the stabilizing rod 7.

[0066] By providing a rubber pad 9 at the connection between the cover plate 8 and the stabilizer bar 7, the movement of the stabilizer bar 7 is buffered, preventing wear caused by the rigid connection between the stabilizer bar 7 and the cover plate 8, which would affect the service life of both the stabilizer bar 7 and the cover plate 8. During the movement of the stabilizer bar 7, the rubber pad 9 can cushion its movement and prevent structural wear between the stabilizer bar 7 and the cover plate 8.

[0067] It should be noted that the specific shape of the rubber pad 9 is not limited in this application. The preferred embodiment is that the rubber pad 9 has an opening and can fully wrap the stabilizer bar 7 to prevent direct contact between the stabilizer bar 7 and the cover plate 8, which would cause wear on the stabilizer bar and the cover plate 8.

[0068] As a preferred embodiment of this application,

[0069] The leaf spring rear bracket 4 is provided with a lifting lug connection hole 43. The lower end of the upper lifting lug 10 is detachably fixedly connected to the lifting lug connection hole 43, and the upper end of the upper lifting lug 10 is rotatably connected to the leaf spring assembly 1.

[0070] By providing a lug connection hole 43 in the rear bracket 4 of the leaf spring, the lower end of the upper lug 10 is detachably connected to the lug connection hole 43, and the upper end of the upper lug 10 is rotatably connected to the leaf spring assembly 1, thereby achieving the purpose of raising the fixed height of the leaf spring assembly 1, reducing the distance between the wheel and the frame 3, reducing the overall vehicle height, and thus lowering the vehicle's center of gravity, resulting in better vehicle handling stability.

[0071] For any parts not mentioned in this invention, existing technologies can be used or referenced.

[0072] The technical solutions protected by this invention are not limited to the above embodiments. It should be noted that any combination of the technical solutions of any embodiment with one or more other embodiments is within the protection scope of this invention. Although the invention has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of this invention are within the scope of protection claimed by this invention.

Claims

1. A rear suspension system for a commercial vehicle, characterized in that, The vehicle includes a frame, on both sides of which are provided with leaf spring load-bearing systems. The leaf spring load-bearing systems are fixedly connected to the frame via upper hangers. An axle is provided at the bottom of the frame, and a shock absorber system is connected between the axle and the frame. The upper end of the shock absorber system is connected to the frame via a shock absorber bracket. A stabilizer bar system is provided below the frame. The stabilizer bar system can be fixedly connected to the leaf spring load-bearing systems and can be fixedly connected to the upper hangers via a leaf spring rear bracket. The stabilizer bar body of the stabilizer bar system is fixedly connected to the lower end of the upper hanger. The upper end of the upper hanger is rotatably connected to the leaf spring assembly of the leaf spring load-bearing system. The side of the upper hanger is fixedly connected to the frame.

2. The rear suspension system for a commercial vehicle according to claim 1, characterized in that, The leaf spring load-bearing system includes a leaf spring assembly. The front end of the leaf spring assembly is fixedly connected to the vehicle frame via a leaf spring front bracket. The leaf spring assembly is rotatably connected to the leaf spring front bracket. The rear end of the leaf spring assembly is rotatably connected to the upper mounting lug. The upper mounting lug is fixedly connected to the vehicle frame via a leaf spring rear bracket.

3. A commercial vehicle rear suspension system according to claim 2, characterized in that, The lower end of the leaf spring assembly is provided with a stabilizer bar connector, and the stabilizer bar system is fixedly connected to the leaf spring assembly through the stabilizer bar connector.

4. A commercial vehicle rear suspension system according to claim 3, characterized in that, The stabilizer bar system includes a stabilizer bar body, and stabilizer bar brackets are provided at both ends of the stabilizer bar body. The stabilizer bar brackets are connected to the stabilizer bar connectors.

5. A commercial vehicle rear suspension system according to claim 4, characterized in that, One end of the stabilizer bar bracket is rotatably connected to the stabilizer bar body, and the other end of the stabilizer bar bracket is rotatably connected to the stabilizer bar connector.

6. A commercial vehicle rear suspension system according to claim 5, characterized in that, The stabilizer bar bracket includes a connecting plate, and baffles are vertically fixed on both sides of the connecting plate. The upper end of the baffle is rotatably connected to the stabilizer bar connector by fixing bolts and nuts, and the lower end of the baffle is rotatably connected to the stabilizer bar body by fixing bolts and nuts.

7. A commercial vehicle rear suspension system according to claim 6, characterized in that, The stabilizer bar is fixedly connected to the leaf spring rear bracket.

8. A commercial vehicle rear suspension system according to claim 7, characterized in that, The lower end of the leaf spring rear bracket is provided with a connecting base, the connecting base is provided with an internal threaded hole, the stabilizer rod body is provided with a cover plate, the cover plate is provided with a through hole corresponding to the internal threaded hole, and the bolt passes through the through hole and is tightened and fixedly connected to the internal threaded hole.

9. A commercial vehicle rear suspension system according to claim 8, characterized in that, A rubber pad is fitted between the cover plate and the stabilizer bar.

10. A commercial vehicle rear suspension system according to claim 2, characterized in that, The rear support of the leaf spring is provided with a lifting lug connection hole. The lower end of the upper lifting lug is detachably fixedly connected to the lifting lug connection hole, and the upper end of the upper lifting lug is rotatably connected to the leaf spring assembly.

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