Light commercial vehicle chassis

Abstract

The light commercial vehicle chassis comprises a bottom frame, and the bottom frame is provided with a battery module and an electrical control module; the suspension system comprises a front suspension and a rear suspension, the rear suspension comprises a rear suspension suspended spring, a rear axle tube, a driving motor and a speed reducer, the rear suspension suspended spring is connected with the main frame through a guide arm, the outer end of the rear suspension tube is connected with a brake disc, and a hub unit is arranged on the outer side of the brake disc; a steering system; and a braking system. According to the chassis, dynamic adjustment of rigidity and height is achieved through air suspension, comfort and controllability are improved, the assembling efficiency is improved through modular design, the lightweight structure is balanced in bearing, new energy drive is adapted, and good practicability is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile chassis, in particular to a light commercial vehicle chassis. Background Art

[0002] In the field of automotive chassis technology, the chassis performance of light commercial vehicles directly affects the overall performance of the vehicle. Existing light commercial vehicle chassis generally use traditional mechanical suspension structures. In addition to problems such as fixed suspension stiffness, inconvenient adjustment, and poor maneuverability, its core technical defects also include:

[0003] 1. Insufficient compatibility of advanced suspension systems

[0004] Existing light commercial vehicle chassis rely heavily on passive suspension (such as leaf springs or coil springs), making them incapable of adapting to the technical requirements of both active and semi-active suspension. Active suspension requires real-time power input to actively counteract road impacts, but existing chassis mechanical structures lack power integration interfaces. Semi-active suspension relies on sensors and damping adjustment modules, but the existing chassis electronic control architecture is rudimentary and cannot support high-frequency dynamic damping adjustments, thus limiting the shock absorption efficiency of advanced suspension systems.

[0005] 2. Lack of coordination among high-level intelligent driving systems

[0006] With the development of intelligent driving technology, high-level intelligent driving (such as L3 and above) requires deep integration between the chassis and intelligent driving systems (such as real-time road condition response and body posture control). Existing light commercial vehicle chassis lack an intelligent driving-chassis collaborative interface, making it impossible to transmit data such as height sensors and suspension status to the intelligent driving controller in real time. As a result, the intelligent driving system cannot dynamically adjust driving strategies based on the chassis (such as pre-adjusting suspension stiffness in the event of bumps), which limits the improvement of vehicle intelligence.

[0007] 3. Difficulty integrating pure electric drive systems

[0008] The existing light commercial vehicle chassis architecture is not optimized for pure electric systems, resulting in bottlenecks in powertrain-suspension integration.

[0009] The mechanical layout of the motor and the rear suspension tube conflicts. Traditional chassis rear suspensions are mostly mechanically driven, and adapting to electric drive requires significant changes to the suspension support structure.

[0010] The battery layout conflicts with the suspension space. The existing chassis does not reserve space for the battery pack. Forcing it to be installed will cause the center of gravity to shift, affecting the suspension load distribution and vehicle handling stability.

[0011] The energy recovery requirements of the electric drive system are disconnected from the suspension adjustment, and the energy recovery efficiency cannot be optimized through dynamic suspension adjustment. Summary of the Invention

[0012] The object of the present invention is to provide a light commercial vehicle chassis to solve the problems raised in the above background technology.

[0013] To achieve the above-mentioned object, the present invention provides the following technical solution: a light commercial vehicle chassis, comprising:

[0014] The chassis includes a main frame and a sub-frame, wherein the sub-frame is provided on the lower side of the main frame, and the main frame is provided with a battery module and an electrical control module;

[0015] A suspension system includes a front suspension and a rear suspension, wherein the front suspension includes a front suspension spring, an upper swing arm and a lower swing arm, the bottom end of the front suspension spring is connected to the lower swing arm, and the top end of the front suspension spring is connected to the main frame via a front suspension mounting seat, the rear suspension includes a rear suspension spring, a rear suspension tube, a drive motor and a reducer, the rear suspension spring is connected to the main frame via a guide arm, the outer end of the rear suspension tube is connected to a brake disc, a wheel hub unit is provided on the outer side of the brake disc, a brake motor and a dust cover are provided on the inner side of the brake disc, and the front suspension spring and the rear suspension spring are connected to an air pump via a control module;

[0016] A steering system, mounted on the chassis, comprising a steering column, a drive shaft, a steering gear, a steering tie rod, and an electronic booster, wherein the steering column is connected to the drive shaft via a universal joint, the drive shaft is connected to the steering gear via a universal joint, steering tie rods are provided on both sides of the steering gear, and the electronic booster is connected to the steering tie rod on one side of the steering gear; and

[0017] The braking system includes a brake disc, a brake caliper, and a steering knuckle connected to the brake caliper. The brake disc is connected to the brake pedal through a brake pipe. The braking system is connected to an ESC module.

[0018] Preferably, the chassis includes the sub-frame including longitudinal beams and transverse beams connecting the longitudinal beams, connecting plates are provided at both ends of the longitudinal beams, and reinforcing plates are provided inside the connecting plates.

[0019] Preferably, the front suspension spring includes an upper air chamber, a first bladder skin and a piston, the first bladder skin connects the upper air chamber and the piston to form a closed air bag, a shock absorber assembly is provided in the piston, a guide sleeve is provided on the outside of the first bladder skin, and a dust cover is provided between the bottom end of the guide sleeve and the shock absorber assembly.

[0020] Preferably, the top end of the damping rod of the shock absorber assembly extends to the upper air chamber, a buffer block is provided between the upper end of the damping rod and the upper air chamber, the top end of the damping rod is provided with a top glue, a one-way valve is provided on the bottom side of the top glue, and a locking nut is provided at the top end of the top glue.

[0021] Preferably, a sealing ring gasket and a first O-ring are provided at the bottom end of the piston, a piston buckle for fixing the bladder skin is provided at the upper end of the piston, an upper air chamber buckle for fixing the bladder skin is provided at the upper end of the damping rod, a retaining spring and a second O-ring are provided at the top end of the upper air chamber, and a sealing cover is provided at the top end of the upper air chamber.

[0022] Preferably, the rear suspension spring includes an upper seat and a rear suspension piston, a second bladder is provided between the upper seat and the rear suspension piston, the upper seat is provided with a quick plug connector, the rear suspension piston is provided with a piston pressure ring, and the upper seat is provided with an upper pressure ring.

[0023] Preferably, the suspension system further includes an air suspension controller and a height sensor, and the air suspension controller and the height sensor are connected to the ECU.

[0024] Preferably, the rear suspension further includes a rear shock absorber, a rear lateral stabilizer bar and a rear buffer block, the rear shock absorber is connected to the rear suspension tube and the main frame, and both ends of the rear lateral stabilizer bar are connected to the rear suspension tube.

[0025] Preferably, the main frame is further provided with a plurality of shock absorber bushings, and the shock absorber bushings are symmetrically arranged on both sides of the main frame.

[0026] Preferably, a leaf spring mounting block is detachably provided on the rear side of the main frame, a leaf spring is provided between the leaf spring mounting blocks, the front suspension includes a coil spring, an upper swing arm and a lower swing arm, the bottom end of the coil spring is connected to the lower swing arm, and the top end of the coil spring is connected to the main frame through the front suspension mounting seat.

[0027] Compared with the existing technology, the beneficial effects of the present invention are as follows: the light commercial vehicle chassis of the present invention realizes dynamic adjustment of suspension stiffness and vehicle height through the air suspension system and multi-system integrated design, thereby improving driving comfort and handling stability under complex working conditions; the modular structure reduces the number of components, optimizes assembly efficiency and maintenance convenience; the lightweight design reduces the weight of the chassis while ensuring the load-bearing capacity, and the rear suspension is integrated with an electric drive system to adapt to the needs of new energy and realize the integrated coordination of drive and suspension. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the present invention;

[0029] Figure 2 Schematic diagram of the suspension system structure of the present invention;

[0030] Figure 3 Schematic diagram of the rear suspension structure of the present invention;

[0031] Figure 4 This is a schematic diagram of the front suspension spring structure of the present invention;

[0032] Figure 5This is a cross-sectional view of the front suspension spring of the present invention;

[0033] Figure 6 This is a schematic diagram of the rear suspension spring structure of the present invention;

[0034] Figure 7 This is a cross-sectional view of the rear suspension spring of the present invention;

[0035] Figure 8 Schematic diagram of the braking system structure of the present invention;

[0036] Figure 9 This is a schematic structural diagram of the steering system of the present invention;

[0037] Figure 10 Schematic diagram of the rear suspension structure of the present invention;

[0038] Figure 11 This is a schematic diagram of the leaf spring structure of the present invention;

[0039] Figure 12 This is a schematic diagram of the rear suspension spring support structure of the present invention;

[0040] Figure 13 It is a schematic diagram of the subframe structure of the present invention.

[0041] In the figure: 1. chassis; 11. main frame; 12. subframe; 121. longitudinal beam; 122. cross beam; 123. connecting plate; 124. reinforcement plate; 13. battery module; 14. electrical control module; 15. leaf spring mounting block; 16. leaf spring; 2. suspension system; 21. upper control arm; 22. lower control arm; 23. rear suspension tube; 24. drive motor; 25. reducer; 26. control guide arm; 27. brake disc; 28. wheel hub unit; 29. ​​brake motor; 291. dust cover; 292. control module; 293. air pump; 294. rear shock absorber; 295. rear anti-roll bar; 296. rear buffer block; 297. front suspension mounting seat; 298. coil spring; 3. steering system; 31. steering column; 32. drive shaft; 33. steering 1. Brake system; 2. Brake disc; 3. Brake caliper; 4. Steering knuckle; 5. Brake pedal; 6. Front suspension spring; 7. Upper air chamber; 8. First bladder; 9. First piston; 10. Sealing ring; 11. First O-ring; 12. Piston retaining ring; 13. Upper air chamber retaining ring; 14. Sealing cover; 15. Guide sleeve; 16. Buffer block; 17. Shock absorber assembly; 18. Dust cover; 19. Damping rod; 20. Height sensor; 21. Shock absorber bushing; 22. Rear suspension spring; 23. Upper seat; 24. Rear suspension piston; 25. Second bladder; 26. Quick connector; 27. Piston pressure ring; 28. Upper pressure ring; 29. ​​Rear suspension spring support; 30. Top rubber; 31. One-way valve; 32. Lock nut. DETAILED DESCRIPTION

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0043] See also Figures 1 to 13 The present invention provides a technical solution: a light commercial vehicle chassis, including a chassis 1, a suspension system 2, a steering system 3 and a braking system 4, the suspension system 2 is installed on the chassis 1, the steering system 3 is pressed on the front end of the chassis 1, and the braking system 4 is installed on the chassis 1.

[0044] In this embodiment of the present invention, the chassis 1 comprises a main frame 11 and a subframe 12. The subframe 12 is located below the main frame 11, which is equipped with a battery module 13 and an electrical control module 14. The electrical control module 14 of the present invention is removable and replaceable with a reducer. The subframe 12 comprises a longitudinal beam 121 and a crossbeam 122 connecting the longitudinal beams. Connecting plates 123 are provided at each end of the longitudinal beam 121, and reinforcing plates 124 are provided inside the connecting plates 123. The subframe is connected to the main frame via the connecting and reinforcing plates.

[0045] In an embodiment of the present invention, the suspension system 2 includes a front suspension and a rear suspension. The front suspension includes a front suspension spring 5, an upper swing arm 21, and a lower swing arm 22. The bottom end of the front suspension spring is connected to the lower swing arm 22, and the top end of the front suspension spring 5 is connected to the main frame 11 via a front suspension mounting seat 297. The rear suspension includes a rear suspension spring 7, a rear suspension tube 23, a drive motor 24, and a reducer 25. The rear suspension spring is connected to the main frame 11 via a guide arm 26. The outer end of the rear suspension tube 23 is connected to a brake disc 27. The outer side of the brake disc 27 is provided with a wheel hub unit 28. The inner side of the brake disc 27 is provided with a brake motor 29 and a dust cover 291. The brake disc 27 has a brake caliper. The front and rear suspension springs are connected to an air pump 293 via a control module 292. There is a drive shaft inside the rear suspension tube 23, and the outer end of the drive shaft is connected to the wheel hub unit 28. The drive motor 24 directly drives the wheel hub unit 28 to rotate through the drive shaft, so that the rear suspension structure is called a full floating suspension applied to the light commercial vehicle chassis, which is different from the light commercial vehicle chassis suspension in the prior art.

[0046] In an embodiment of the present invention, the bottom end of the front suspension spring is connected to the lower arm 22, and the front suspension spring 5 includes an upper air chamber 51, a first bladder skin 52 and a first piston 53. The first bladder skin 52 connects the upper air chamber 51 and the first piston 53 to form a closed air bag, and a shock absorber assembly 6 is provided in the first piston 53.

[0047] In an embodiment of the present invention, the top end of the damping rod 61 of the shock absorber assembly 6 extends to the upper air chamber 51, a buffer block 7 is provided between the upper end of the damping rod 61 and the upper air chamber 51, the top end of the damping rod 61 is provided with a top glue 8, a one-way valve 9 is provided on the bottom side of the top glue 8, and a locking nut 10 is provided at the top end of the top glue 8.

[0048] In an embodiment of the present invention, a sealing ring gasket 54 and a first O-ring 55 are provided at the bottom end of the first piston 53, a piston retaining ring 56 for fixing the first bladder skin 52 is provided at the upper end of the first piston 53, an upper air chamber retaining ring 57 for fixing the first bladder skin 52 is provided at the upper air chamber 51, a retaining spring 62 and a second O-ring 63 are provided at the top end of the damping rod 61, and a sealing cover 58 is provided at the top end of the upper air chamber 51.

[0049] In the embodiment of the present invention, a guide sleeve 59 is provided on the outside of the first bladder shell 52 , and a dust cover 60 is provided between the bottom end of the guide sleeve 59 and the shock absorber assembly 6 .

[0050] In an embodiment of the present invention, the rear suspension spring 7 includes an upper seat 71 and a rear suspension piston 72, a second bladder skin 73 is provided between the upper seat 71 and the rear suspension piston 72, the upper seat 71 is provided with a quick-connect connector 74, the rear suspension piston 72 is provided with a piston pressure ring 75, the upper seat is provided with an upper pressure ring 76, and the rear suspension spring 7 passes through the rear suspension spring support 77.

[0051] In an embodiment of the present invention, the suspension system further includes an air suspension controller and a height sensor 62 , and the air suspension controller and the height sensor 62 are connected to the ECU.

[0052] In an embodiment of the present invention, the rear suspension further includes a rear shock absorber 294, a rear lateral stabilizer bar 295 and a rear buffer block 296. The rear shock absorber 294 is connected to the rear suspension tube 23, and the rear buffer block 296 is made of a material with a certain elasticity, such as polyurethane or rubber.

[0053] In this embodiment of the present invention, a leaf spring mounting block 15 is removably mounted on the rear side of the main frame 11. Leaf spring 16 is directly mounted on this mounting block. By removing the rear suspension spring support 77, the rear suspension spring assembly can be replaced with a low-cost leaf spring shock-absorbing structure to meet diverse market demands. Similarly, the front suspension spring 5 can also be removed and replaced with a lower-cost coil spring 298.

[0054] In an embodiment of the present invention, the height sensor 62 serves as a core sensing component and forms an integrated collaborative control network with the suspension system, the advanced intelligent driving system, and the pure electric drive system. The specific implementation is as follows:

[0055] 1. Dynamic Adjustment of Suspension System and Active / Semi-active Suspension

[0056] The height sensor monitors the changes in vehicle height in real time and transmits them to the ECU. When the vehicle passes over bumpy roads such as speed bumps, the sensor captures the vertical fluctuations of the vehicle body at a sampling frequency of 100Hz. The ECU immediately instructs the air pump 25 to quickly inflate the upper air chamber 51 of the front suspension spring 5. At the same time, the damping rod 61 of the shock absorber assembly 6 increases the damping force through the solenoid valve, forming an active buffer of "air pressure support + hydraulic damping"; when driving on a curve, after the difference in the height sensor signals on both sides exceeds the threshold, the ECU synchronously adjusts the air pressure of the bladder 27 of the rear suspension spring 24 and the damping force grading of the shock absorber bushing 63 to suppress roll while optimizing comfort.

[0057] 2. Collaborative Control and Safety Strategies for Advanced Intelligent Driving Systems

[0058] When the front camera identifies bumpy road conditions ahead, the height sensor transmits the vehicle height data to the intelligent driving domain controller, triggering the front suspension spring inflation adjustment 0.5 seconds in advance. At the same time, the electronic power booster 35 of the steering system automatically adjusts the steering assist torque according to the vehicle body posture; when the height sensor continuously detects abnormal fluctuations in the vehicle body (such as one side of the wheel is more than 10mm off the ground), the ECU links the ESC module of the braking system to apply braking force to the wheel on the suspended side, and inflate the air spring on the other side to maintain balance and avoid the risk of rollover.

[0059] 3. Integrated electric drive system and suspension

[0060] When motor 16 is activated, the vehicle's pitch angle exceeds 3°, detected by the vehicle height sensor. The ECU inflates the front suspension springs and deflates the rear suspension springs, optimizing the front-to-rear axle load distribution to 55:45. When the battery charge drops below 20%, the sensor triggers an automatic increase in the rear suspension spring stiffness to compensate for battery weight loss. During braking, if the sensor detects a 12% increase in front axle load, the ECU controls the front axle motor to increase regenerative torque by 10-15%. Simultaneously, the front suspension spring's check valve 9 opens to rapidly inflate the springs, maximizing braking energy recovery.

[0061] 4. Multi-system data fusion and hardware adaptation

[0062] The height sensor synchronously transmits data to the air suspension controller, intelligent driving domain controller, and electric drive VCU via the CAN FD bus, achieving cross-domain collaborative latency of ≤10ms. For example, during high-speed cruising, the sensor signal is used to simultaneously lower the air suspension height by 15mm, optimize following distance for the intelligent driving system, and improve motor efficiency by 3% for the electric drive system. Its standardized interface is compatible with hardware such as the active suspension air pump solenoid valve and semi-active suspension damping module, enabling multi-system integration without modification.

[0063] In an embodiment of the present invention, the suspension system further includes a plurality of shock absorber bushings 63 , which are symmetrically arranged on both sides of the chassis.

[0064] In an embodiment of the present invention, the steering system 3 chassis 1 includes a steering column 31, a drive shaft 32, a steering gear 33, a steering rod 34 and an electronic booster 35. The steering column 31 is connected to the drive shaft 32 through a universal joint, the drive shaft 32 is connected to the steering gear 33 through a universal joint, steering rods 34 are arranged on both sides of the steering gear 33, and the electronic booster 35 is connected to the steering rod on one side of the steering gear 33.

[0065] In an embodiment of the present invention, the brake system 4 includes a brake disc 41, a brake caliper 42 and a steering knuckle 43 connected to the brake caliper 42. The brake disc 41 is connected to a brake pedal 44 via a brake pipe. The brake system is connected to an ESC module.

[0066] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A light commercial vehicle chassis, characterized in that: include: The chassis includes a main frame and a sub-frame, wherein the sub-frame is arranged on the lower side of the main frame, and the main frame is provided with a battery module and an electrical control module; A suspension system includes a front suspension and a rear suspension, wherein the front suspension includes a front suspension spring, an upper swing arm, and a lower swing arm, the bottom end of the front suspension spring is connected to the lower swing arm, and the top end of the front suspension spring is connected to the main frame via a front suspension mounting seat, the rear suspension includes a rear suspension spring, a rear suspension tube, a drive motor, and a reducer, the rear suspension spring is connected to the main frame via a guide arm, the outer end of the rear suspension tube is connected to a brake disc, a wheel hub unit is provided on the outer side of the brake disc, a brake motor and a dust cover are provided on the inner side of the brake disc, and the front suspension spring and the rear suspension spring are connected to an air pump via a control module; A steering system, mounted on the chassis, comprising a steering column, a drive shaft, a steering gear, a steering tie rod, and an electronic booster, wherein the steering column is connected to the drive shaft via a universal joint, the drive shaft is connected to the steering gear via a universal joint, steering tie rods are provided on both sides of the steering gear, and the electronic booster is connected to the steering tie rod on one side of the steering gear; and The braking system includes a brake disc, a brake caliper, and a steering knuckle connected to the brake caliper. The brake disc is connected to the brake pedal through a brake pipe. The braking system is connected to an ESC module.

2. A light commercial vehicle chassis according to claim 1, characterized in that: The sub-frame includes a longitudinal beam and a transverse beam connecting the longitudinal beams. Connecting plates are provided at both ends of the longitudinal beam, and reinforcing plates are provided inside the connecting plates.

3. A light commercial vehicle chassis according to claim 2, characterized in that: The front suspension spring includes an upper air chamber, a first bladder skin and a piston. The first bladder skin connects the upper air chamber and the piston to form a closed air bag. A shock absorber assembly is provided in the piston, a guide sleeve is provided on the outside of the first bladder skin, and a dust cover is provided between the bottom end of the guide sleeve and the shock absorber assembly.

4. A light commercial vehicle chassis according to claim 3, characterized in that: The top end of the damping rod of the shock absorber assembly extends to the upper air chamber, a buffer block is provided between the upper end of the damping rod and the upper air chamber, the top end of the damping rod is provided with a top glue, a one-way valve is provided on the bottom side of the top glue, and a locking nut is provided on the top end of the top glue.

5. A light commercial vehicle chassis according to claim 4, characterized in that: The bottom end of the piston is provided with a sealing ring gasket and a first O-ring, the upper end of the piston is provided with a piston buckle for fixing the bladder skin, the upper air chamber is provided with an upper air chamber buckle for fixing the bladder skin, the top end of the damping rod is provided with a retaining spring and a second O-ring, and the top end of the upper air chamber is provided with a sealing cover.

6. A light commercial vehicle chassis according to claim 5, characterized in that: The rear suspension spring includes an upper seat and a rear suspension piston, a second bladder skin is provided between the upper seat and the rear suspension piston, the upper seat is provided with a quick plug connector, the rear suspension piston is provided with a piston pressure ring, and the upper seat is provided with an upper pressure ring.

7. A light commercial vehicle chassis according to claim 6, characterized in that: The suspension system further includes an air suspension controller and a height sensor, and the air suspension controller and the height sensor are connected to the ECU.

8. The light commercial vehicle chassis according to claim 7, characterized in that: The rear suspension further comprises a rear shock absorber, a rear lateral stabilizer bar and a rear buffer block. The rear shock absorber is connected to the rear suspension tube and the main frame. Both ends of the rear lateral stabilizer bar are connected to the rear suspension tube.

9. The light commercial vehicle chassis according to claim 9, characterized in that: The main frame is further provided with a plurality of shock absorber bushings, which are symmetrically arranged on both sides of the main frame.

10. A light commercial vehicle chassis according to claim 9, characterized in that: The rear side of the main frame is detachably provided with a leaf spring mounting block, and a leaf spring is provided between the leaf spring mounting blocks. The front suspension includes a coil spring, an upper swing arm and a lower swing arm. The bottom end of the coil spring is connected to the lower swing arm, and the top end of the coil spring is connected to the main frame through a front suspension mounting seat.

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