Rear-drive rear plate spring suspension module and vehicle

Abstract

The utility model provides a rear-drive rear plate spring suspension module and a vehicle. The rear-drive rear plate spring suspension module comprises a wheel side assembly, an electric drive assembly, a constant-speed drive shaft, a plate spring, a rigid axle and a buffer block. The two ends of the constant-speed driving shaft are in transmission connection with the electric drive assembly and the wheel edge assembly. And the rigid axle is connected with the wheel side assembly and the plate spring. The rigid bridge comprises a bridge pipe, and the bridge pipe is arranged below the buffer block. The axle tube and the bumper block are offset from the constant-speed drive shaft in the front-back direction. Through combination of the plate spring, the rigid axle and the electric drive assembly, rear drive is achieved, and the power performance is improved. Meanwhile, the axle tube and the buffer block are designed in an offset mode, space conflicts between the axle tube and the constant-speed drive shaft and between the axle tube and the electric drive assembly are avoided, the vertical height of the rear-drive rear plate spring suspension module is reduced, and therefore the height of a cargo platform of a vehicle is effectively reduced, and the volume of a cargo tank is increased.

Description

Technical Field

[0001] This application relates to the field of vehicles, and more particularly to rear-wheel drive rear leaf spring suspension modules and vehicles. Background Technology

[0002] With economic growth and accelerated infrastructure construction such as roads, goods are transported to all parts of the country, resulting in a steady increase in freight volume. Transport vehicles play a crucial role in last-mile delivery. The number of existing transport vehicles, such as light-duty new energy logistics vehicles, is growing, intensifying market competition. The main factor affecting the platform height, cargo box volume, and front / rear drive of transport vehicles is the arrangement of the vehicle's rear suspension modules.

[0003] Traditional transport vehicles using rigid leaf spring suspension are typically front-wheel drive. However, on inclines, the center of gravity shifts rearward, reducing front-wheel traction and resulting in weaker power and poorer climbing ability. If an electric leaf spring suspension is used, the electric drive assembly and reducer are fixedly connected to the rear suspension module, leading to a larger unsprung mass and greater impact during operation, resulting in poor ride comfort. Furthermore, because the electric drive assembly and reducer are fixed to the rear suspension module, they also bounce up and down with the wheels, requiring a higher floor clearance and significantly reducing cargo box volume.

[0004] Therefore, it is necessary to provide an improved rear-wheel drive rear leaf spring suspension module and vehicle to solve the above problems. Utility Model Content

[0005] This application provides a rear-wheel drive rear leaf spring suspension module and vehicle with strong power performance and large cargo box volume. The rear-wheel drive rear leaf spring suspension module includes a wheel-side assembly, an electric drive assembly, a constant velocity drive shaft, leaf springs, a rigid axle, and a buffer block. Both ends of the constant velocity drive shaft are connected to the electric drive assembly and the wheel-side assembly. The rigid axle is connected to the wheel-side assembly and the leaf springs. The rigid axle includes an axle tube, which is located below the buffer block. The axle tube and the buffer block are offset relative to the constant velocity drive shaft in the longitudinal direction.

[0006] Furthermore, the rigid bridge also includes mounting portions disposed on both sides of the bridge tube, the mounting portions being connected to the leaf spring and the wheel assembly; the bridge tube includes a main bridge tube and a side bridge tube, the side bridge tube connecting the main bridge tube and the mounting portions, the side bridge tube being offset from the constant velocity drive shaft, and the main bridge tube being parallel to the constant velocity drive shaft.

[0007] Furthermore, the bridge tube and the buffer block are located in front of or behind the constant velocity drive shaft, and the bridge tube is located below the constant velocity drive shaft; the side bridge tube is provided with an impact part, which corresponds to the buffer block and is located directly below the buffer block.

[0008] Furthermore, the mounting portion includes a leaf spring support block and a wheel-side mounting block extending from the side axle tube. The leaf spring support block is located below the leaf spring and connected to the leaf spring, and the wheel-side mounting block is connected to the constant velocity drive shaft and the wheel-side assembly.

[0009] Furthermore, the leaf spring includes a leaf spring body and a leaf spring front bracket and a leaf spring rear bracket disposed at both ends of the leaf spring body. The leaf spring body is disposed inside the wheel assembly and below the constant velocity drive shaft. The leaf spring also includes a pressure plate and a U-bolt. The pressure plate is disposed on the leaf spring body, and the U-bolt is sleeved on the leaf spring body and the pressure plate and fixed to the leaf spring support block.

[0010] Furthermore, the bridge tube is manufactured using a hydraulic expansion molding process or a sheet metal welding process.

[0011] Furthermore, it also includes a subframe, which is disposed between the leaf springs, and a suspension is provided on the subframe, with the electric drive assembly connected to the suspension.

[0012] Furthermore, it also includes a vibration damper, which includes a vibration damper body and a vibration damper bracket disposed at one end of the vibration damper body. The vibration damper body is inclined, and the other end of the vibration damper body is connected to the rigid bridge.

[0013] Furthermore, the constant velocity drive shaft includes a first connection end that is driven to the output end of the electric drive assembly and a second connection end that is connected to the wheel-side assembly, wherein the first connection end is provided with a detachable flange.

[0014] This application also provides a vehicle including a body and a rear-wheel drive rear leaf spring suspension module as described above, wherein the leaf spring is connected to the body, the body includes longitudinal beams, and the buffer block is fixed to the longitudinal beams.

[0015] This application achieves rear-wheel drive by combining leaf springs, a rigid axle, and an electric drive assembly, thereby improving power performance. Simultaneously, the offset design of the axle tube and buffer block avoids spatial conflicts between the rigid axle and buffer block and the constant velocity drive shaft and electric drive assembly, reducing the vertical height of the rear-wheel drive leaf spring suspension module. This effectively lowers the vehicle's cargo platform height and increases cargo box volume. Attached Figure Description

[0016] Figure 1 This is a perspective view of a rear-drive rear leaf spring suspension module according to an exemplary embodiment of this application.

[0017] Figure 2 yes Figure 1 The diagram shows a top view of the rear-wheel drive rear leaf spring suspension module.

[0018] Figure 3 yes Figure 1 The side view shown is of the rear-wheel drive rear leaf spring suspension module.

[0019] Figure 4 yes Figure 1 The image shows a front view of the rear-wheel drive rear leaf spring suspension module.

[0020] Figure 5 yes Figure 1 A perspective view of the constant velocity drive shaft of the rear-drive leaf spring suspension module shown.

[0021] Figure 6 yes Figure 1 A three-dimensional view of the rigid bridge of the rear-wheel drive rear leaf spring suspension module shown.

[0022] Explanation of icon numbers

[0023] 10. Wheel edge assembly; 11. Left wheel edge assembly; 12. Right wheel edge assembly; 20. Electric drive assembly; 30. Constant velocity drive shaft; 301. Left constant velocity drive shaft; 302. Right constant velocity drive shaft; 31. First connecting end; 311. Removable flange; 32. Second connecting end; 40. Leaf spring; 401. Left leaf spring; 402. Right leaf spring; 41. Leaf spring body; 42. Leaf spring front bracket; 43. Leaf spring rear bracket; 44. Pressure plate; 45. U-bolt; 50. Rigid bridge; 51. Bridge tube; 511. 512 Main axle tube; 513 Side axle tube; 52 Impact section; 52 Mounting section; 521 Leaf spring support block; 5211 Mounting hole; 522 Wheel-side mounting block; 60 Buffer block; 70 Subframe; 71 First crossbeam; 72 Second crossbeam; 73 First longitudinal beam; 74 Second longitudinal beam; 80 Suspension; 81 Front suspension; 82 First rear suspension; 83 Second rear suspension; 90 Shock absorber; 91 Shock absorber body; 911 Front end; 912 Rear end; 92 Shock absorber bracket. Detailed Implementation

[0024] The technical solutions in the embodiments (or "implementations") of this application will be clearly and completely described herein with reference to the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0025] If the embodiments of this application contain terms relating to directional indications or positional relationships (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationships and movements between components in a specific posture (as shown in the attached figures); if the specific posture changes, the directional indications or positional relationships will also change accordingly. Furthermore, the terms "first" and "second" used in the embodiments of this application are only for descriptive convenience and should not be construed as indicating or implying relative importance.

[0026] See Figures 1 to 4 As shown, this application provides a rear-wheel drive rear leaf spring suspension module, including a wheel-side assembly 10, an electric drive assembly 20, a constant velocity drive shaft 30, a leaf spring 40, a rigid bridge 50, and a buffer block 60. The two ends of the constant velocity drive shaft 30 are connected to the electric drive assembly 20 and the wheel-side assembly 10 for transmission. The rigid bridge 50 is connected to the wheel-side assembly 10 and the leaf spring 40. The rigid bridge 50 and the buffer block 60 are positioned in the longitudinal direction (…). Figures 1 to 3 The arrow direction shown is offset relative to the constant velocity drive shaft 30.

[0027] Two wheel assemblies 10 are provided: a left wheel assembly 11 and a right wheel assembly 12. The left wheel assembly 11 and the right wheel assembly 12 are positioned opposite each other. Both the left wheel assembly 11 and the right wheel assembly 12 are located outside the leaf spring 40. The left wheel assembly 11 and the right wheel assembly 12 are located on both sides of the electric drive assembly 20. The electric drive assembly 20 outputs driving force to the left wheel assembly 11 and the right wheel assembly 12 via the constant velocity drive shaft 30.

[0028] Please also see Figure 5 As shown, the constant velocity drive shaft 30 includes a first connecting end 31 and a second connecting end 32. The first connecting end 31 is connected to the output end of the electric drive assembly 20. The second connecting end 32 is connected to the wheel-side assembly 10. The first connecting end 31 is provided with a detachable flange 311, simplifying the disassembly and assembly process of the constant velocity drive shaft 30. According to the embodiments of this application, the detachable flange 311 is fixed and disassembled by bolts. In addition, quick-release clips or magnetic connection structures can also be used to further shorten the disassembly and assembly time.

[0029] According to an embodiment of this application, two constant velocity drive shafts 30 are provided, namely a left constant velocity drive shaft 301 and a right constant velocity drive shaft 302. The left constant velocity drive shaft 301 is connected between the left wheel assembly 11 and the electric drive assembly 20. The right constant velocity drive shaft 302 is connected between the right wheel assembly 12 and the electric drive assembly 20.

[0030] The leaf spring 40 includes a leaf spring body 41, a front leaf spring bracket 42, and a rear leaf spring bracket 43. The front leaf spring bracket 42 and the rear leaf spring bracket 43 are located at both ends of the leaf spring body 41. The leaf spring body 41 is located inside the wheel assembly 10 and below the constant velocity drive shaft 30. The leaf spring 40 also includes a pressure plate 44 and a U-bolt 45. The pressure plate 44 is located on the leaf spring body 41 and in the middle of the leaf spring body 41. The U-bolt 45 is sleeved on the leaf spring body 41 and the pressure plate 44 and fixed to the rigid bridge 50. The U-bolt 45, the pressure plate 44, and the rigid bridge 50 are combined to fix the leaf spring body 41 and prevent lateral displacement of the leaf spring body 41.

[0031] Two U-bolts 45 are provided, each sleeved around the leaf spring body 41 and the pressure plate 44 and close to both ends of the pressure plate 44, to fix the leaf spring body 41 and the pressure plate 44 to the rigid bridge 50. The leaf spring body 41 is located between the pressure plate 44 and the rigid bridge 50. The U-bolts can also be single or multiple, and this application does not limit the number of U-bolts.

[0032] According to the embodiment of this application, two leaf springs 40 are provided, namely a left leaf spring 401 and a right leaf spring 402. The left leaf spring 401 and the right leaf spring 402 are arranged opposite each other and located on both sides of the electric drive assembly 20. Both the left leaf spring 401 and the right leaf spring 402 are located below the constant velocity drive shaft 30. The left leaf spring 401 is located inside the wheel assembly 10 and close to the left wheel assembly 11, and the right leaf spring 402 is located inside the wheel assembly 10 and close to the right wheel assembly 12.

[0033] In the embodiments of this application, the leaf spring body 41 is connected to the vehicle body via a front leaf spring bracket 42 and a rear leaf spring bracket 43. Alternatively, the front leaf spring bracket 42 and the rear leaf spring bracket 43 may be omitted, and the leaf spring body 41 may be directly connected to the vehicle body.

[0034] See Figure 6 As shown, the rigid axle 50 includes an axle tube 51 and a mounting portion 52. The mounting portion 52 is located on both sides of the axle tube 51. The axle tube 51 is offset relative to the constant velocity drive shaft 30 in the longitudinal direction, and is positioned below the constant velocity drive shaft 30 to prevent interference between the axle tube 51, the constant velocity drive shaft 30, and the electric drive assembly 20 when the wheel bounces. The axle tube 51 is located below the buffer block 60, and the axle tube 51 and the buffer block 60 are located in front of or behind the constant velocity drive shaft 30. The mounting portion 52 is connected to the leaf spring 40 and the wheel assembly 10.

[0035] According to the embodiments of this application, the bridge tube 51 adopts a hydraulic expansion forming process or a sheet metal welding process, which reduces the design weight compared with the traditional casting solution. At the same time, the bridge tube 51 using the hydraulic expansion forming process or sheet metal welding process has fewer welds, avoiding stress concentration fracture and improving the overall vehicle load-bearing capacity.

[0036] The axle tube 51 includes a main axle tube 511, a side axle tube 512, and an impact part 513. The side axle tube 512 connects the main axle tube 511 and the mounting part 52. The side axle tube 512 is offset from the constant velocity drive shaft 30, while the main axle tube 511 is parallel to the constant velocity drive shaft 30. The main axle tube 511 and the side axle tube 512 are located in the same plane and below the constant velocity drive shaft 30. The side axle tube 512 is inclined relative to the main axle tube 511 and the mounting part 52. The impact part 513 is provided on the side axle tube 512. The impact part 513 corresponds to the buffer block 60 and is located directly below the buffer block 60, which can reduce rigid impacts during vehicle operation and extend component life.

[0037] Mounting section 52 includes a leaf spring support block 521 and a wheel rim mounting block 522. The leaf spring support block 521 and wheel rim mounting block 522 extend outward from the side axle tube 512. The leaf spring support block 521 is located below and connected to the leaf spring 40. The wheel rim mounting block 522 is connected to the constant velocity drive shaft 30 and the wheel rim assembly 10. The leaf spring support block 521 has several mounting holes 5211, and U-bolts 45 are assembled into the mounting holes 5211 to connect the U-bolts 45 and the leaf spring support block 521. The leaf spring body 41 and the pressure plate 44 are located between the U-bolts 45 and the leaf spring support block 521.

[0038] According to an embodiment of this application, two buffer blocks 60 are provided, and the two buffer blocks 60 are located directly above the two impact parts 513. The buffer blocks 60 are fixed to the longitudinal beams (not shown) of the vehicle body. One buffer block 60 is located in front of the left constant velocity drive shaft 301, and the other buffer block 60 is located in front of the right constant velocity drive shaft 302. In addition, the two buffer blocks 60 and the axle tube 51 may also be located simultaneously behind the constant velocity drive shaft 30.

[0039] In some implementations, two buffer blocks may be provided in the front-rear direction of the left constant velocity drive shaft 301 and two buffer blocks may be provided in the front-rear direction of the right constant velocity drive shaft 302 to adapt to high load-bearing vehicle models.

[0040] The rear-wheel drive rear leaf spring suspension module also includes a subframe 70, a mount 80, and a shock absorber 90. The subframe 70 is located between the leaf springs 40, and the mount 80 is located on the subframe 70. The shock absorber 90 is located between the subframe 70 and the leaf springs 40. The subframe 70 is connected to the longitudinal beams of the vehicle body. The electric drive assembly 20 is connected to the mount 80 to connect the electric drive assembly 20 to the subframe 70, thereby reducing the unsprung mass of the rear-wheel drive rear leaf spring suspension module. When the vehicle goes over bumps and sloping surfaces, the impact of the unsprung mass is reduced, resulting in higher overall vehicle comfort. At the same time, since the electric drive assembly 20 is connected to the subframe 70, the electric drive assembly 20 does not bounce up and down with the wheels when the vehicle is running. The required floor height is lower, and the cargo platform height is reduced by 15% compared to the electric drive axle leaf spring suspension, increasing the cargo box volume by 10%.

[0041] In other embodiments, the electric drive assembly 20 may be directly connected to the vehicle body instead of being mounted on the subframe 70 via the suspension 80.

[0042] The subframe 70 includes a first crossbeam 71, a second crossbeam 72, a first longitudinal beam 73, and a second longitudinal beam 74. The first crossbeam 71 and the second crossbeam 72 are parallel to the constant velocity drive shaft 30. The first crossbeam 71 is located in front of the electric drive assembly 20 and the constant velocity drive shaft 30, and the second crossbeam 72 is located behind the electric drive assembly 20 and the constant velocity drive shaft 30. The first longitudinal beam 73 and the second longitudinal beam 74 are located at both ends of the electric drive assembly 20. The two ends of the first longitudinal beam 73 are connected to the first crossbeam 71 and the second crossbeam 72, and the two ends of the second longitudinal beam 74 are connected to the first crossbeam 71 and the second crossbeam 72.

[0043] The mounting bracket 80 includes a front bracket 81, a first rear bracket 82, and a second rear bracket 83. The front bracket 81 is mounted on the first crossbeam 71, and the front end of the electric drive assembly 20 is connected to the front bracket 81. The first rear bracket 82 is mounted on the first longitudinal beam 73, and the left end of the electric drive assembly 20 is connected to the first rear bracket 82. The second rear bracket 83 is mounted on the second longitudinal beam 74, and the right end of the electric drive assembly 20 is connected to the second rear bracket.

[0044] The shock absorber 90 includes a shock absorber body 91 and a shock absorber bracket 92. The shock absorber bracket 92 is located at one end of the shock absorber body 91. The other end of the shock absorber body 91 is connected to the rigid axle 50. The shock absorber body 91 is inclined, meaning it is tilted in the longitudinal direction and forms an angle with the ground. This inclined design avoids interference with the constant velocity drive shaft 30 or the leaf spring 40, resulting in a more compact layout. The shock absorber body 91 includes a front end 911 and a rear end 912. Both the front end 911 and the rear end 912 are located behind the constant velocity drive shaft 30, with the front end 911 positioned in front of and below the rear end 912. The front end 911 is connected to the rigid axle 50, and the rear end 912 is connected to the shock absorber bracket 92. The shock absorber body 91 is connected to the vehicle body via the shock absorber bracket 92.

[0045] In some implementations, the shock absorber bracket 92 may be omitted, and the shock absorber body may be directly connected to the vehicle body.

[0046] This application also provides a vehicle, including a body and the aforementioned rear-wheel drive rear leaf spring suspension module, with the leaf spring 40 connected to the body. The body includes longitudinal beams, and the buffer block 60 and subframe 70 are all fixed to the longitudinal beams. According to an embodiment of this application, the vehicle is a light-duty new energy logistics vehicle.

[0047] This application achieves rear-wheel drive for the vehicle through the combination of leaf spring 40, rigid axle 50, and electric drive assembly 20, thereby improving power performance. Simultaneously, the offset design of the axle tube 51 and buffer block 60 avoids spatial conflicts between the rigid axle 50 and buffer block 60 and the constant velocity drive shaft 30 and electric drive assembly 20, reducing the vertical height of the rear-wheel drive rear leaf spring suspension module, thus effectively lowering the vehicle's cargo platform height and increasing cargo box volume.

[0048] It should be noted that the technical solutions or features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings; all modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A rear drive rear leaf spring suspension module, characterized in that, The device includes a wheel assembly, an electric drive assembly, a constant velocity drive shaft, a leaf spring, a rigid bridge, and a buffer block. The two ends of the constant velocity drive shaft are connected to the electric drive assembly and the wheel assembly. The rigid bridge is connected to the wheel assembly and the leaf spring. The rigid bridge includes a bridge tube, which is located below the buffer block. The bridge tube and the buffer block are offset relative to the constant velocity drive shaft in the front-rear direction.

2. The rear drive rear leaf spring suspension module of claim 1, wherein, The rigid bridge also includes mounting portions disposed on both sides of the bridge tube, the mounting portions being connected to the leaf spring and the wheel assembly; the bridge tube includes a main bridge tube and a side bridge tube, the side bridge tube connecting the main bridge tube and the mounting portions, the side bridge tube being offset from the constant velocity drive shaft, and the main bridge tube being parallel to the constant velocity drive shaft.

3. The rear drive rear leaf spring suspension module of claim 2, wherein, The bridge tube and the buffer block are located in front of or behind the constant velocity drive shaft, and the bridge tube is located below the constant velocity drive shaft; the side bridge tube is provided with an impact part, which corresponds to the buffer block and is located directly below the buffer block.

4. The rear drive rear leaf spring suspension module of claim 2, wherein, The mounting section includes a leaf spring support block and a wheel-side mounting block extending from the side axle tube. The leaf spring support block is located below the leaf spring and connected to the leaf spring. The wheel-side mounting block is connected to the constant velocity drive shaft and the wheel-side assembly.

5. The rear drive rear leaf spring suspension module of claim 4, wherein, The leaf spring includes a leaf spring body and a leaf spring front bracket and a leaf spring rear bracket located at both ends of the leaf spring body. The leaf spring body is located inside the wheel assembly and below the constant velocity drive shaft. The leaf spring also includes a pressure plate and a U-bolt. The pressure plate is located on the leaf spring body, and the U-bolt is sleeved on the leaf spring body and the pressure plate and fixed to the leaf spring support block.

6. The rear drive rear leaf spring suspension module of claim 1, wherein, The bridge tube is manufactured using either a liquid expansion molding process or a sheet metal welding process.

7. The rear drive rear leaf spring suspension module of claim 1, wherein, It also includes a subframe, which is disposed between the leaf springs, and a suspension is provided on the subframe, and the electric drive assembly is connected to the suspension.

8. The rear drive rear leaf spring suspension module of claim 1, wherein, It also includes a vibration damper, which includes a vibration damper body and a vibration damper bracket disposed at one end of the vibration damper body. The vibration damper body is inclined, and the other end of the vibration damper body is connected to the rigid bridge.

9. The rear drive rear leaf spring suspension module of claim 1, wherein, The constant velocity drive shaft includes a first connection end that is connected to the output end of the electric drive assembly and a second connection end that is connected to the wheel-side assembly. The first connection end is provided with a detachable flange.

10. A vehicle characterized by comprising: The system includes a vehicle body and a rear-wheel drive rear leaf spring suspension module as described in any one of claims 1-9, wherein the leaf spring is connected to the vehicle body, the vehicle body includes longitudinal beams, and the buffer block is fixed to the longitudinal beams.

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