Electric pickup truck rear bumper structure and design method

Abstract

The present invention provides a rear bumper structure and design method for an electric pickup truck, relating to the technical field of electric pickup trucks, comprising: a rear bumper assembly; a rear step skin is connected to the rear bumper skin; an outer connecting bracket and an inner connecting bracket are installed at both ends of the rear bumper skin; the rear step connecting bracket is respectively connected to the rear step frame and the rear bumper frame, the rear bumper frame is connected to the frame reinforcement via a rear bumper frame connector, the frame reinforcement is fixed to the frame; the rear cross beam of the trailer hook and the front cross beam of the trailer hook are fixedly connected; the two ends of the rear cross beam of the trailer hook and the two ends of the front cross beam of the trailer hook are respectively connected to the rear bumper frame; the two ends of the rear cross beam of the trailer hook are respectively connected to the first end of the cross beam connector, and the second end of the cross beam connector is connected to the rear bumper skin. The present invention can ensure that under rear collision conditions, there is a safe space for the controller to avoid leakage, short circuit, etc. of the live component after a collision.

Description

Technical Field

[0001] The present invention relates to the technical field of electric pickup trucks, and in particular to a rear bumper structure and design method for an electric pickup truck. Background Art

[0002] With the development of new energy battery technology, new energy vehicles continue to experience explosive growth, with sales of pure electric vehicles increasing year by year. In addition to the traditional automotive collision safety standards that focus on occupant injuries caused by physical crushing and inertial impact, regulations are also becoming increasingly stringent regarding post-collision short circuits, electrolyte leaks, electric shocks, explosions, and fires.

[0003] The rear bumper assembly is a key assembly for pickup trucks. Its structure is directly related to its strength performance when subjected to trampling, and also directly affects its deformation mode when subjected to rear collisions. For electric pickup trucks, the rear is often equipped with an electric drive axle, a four-in-one controller, and high-voltage lines. When subjected to rear collisions, unreasonable deformation modes can cause damage to live components, and in severe cases, leakage, short circuits, fires, etc. can occur. Therefore, while controlling costs, it is an important issue for OEMs to consider designing a rear bumper structure that adapts to the original frame structure and can not only ensure electrical safety in rear collisions but also meet the multi-working condition structural strength requirements of the rear bumper. In the existing technology, most pickup trucks are fuel-powered versions, and there are no key electrical components at the rear of the frame. The deformation of the rear bumper during rear collisions is relatively loose, so the structural strength of most rear bumpers is weak, and the load-bearing components are prone to instability and large bending and torsional deformation during high-speed rear collisions. Because the chassis of a pickup truck is relatively high, in order to ensure the convenience of pedaling, the center of mass of the rear bumper is generally lower than the frame. As a result, during a rear collision, the rear pedal is easily hit and squeezed against the rear electrical components, causing damage to the controller and electrical components installed at the rear of the vehicle. Summary of the Invention

[0004] The present invention provides a rear protection mechanism for an electric pickup truck, which can quickly optimize the design of the rear protection structure and ensure the safety space requirements of live components under rear collision conditions.

[0005] The present invention comprises: a rear bumper assembly; the rear bumper assembly and the vehicle controller are respectively mounted on a vehicle frame, and the rear bumper assembly is arranged at the end of the vehicle frame;

[0006] The rear bumper assembly includes: rear step skin, rear bumper skin, rear step frame, rear step connecting bracket, trailer hook rear crossbeam, trailer hook front crossbeam, rear bumper frame, rear bumper frame connecting parts, frame reinforcement and two crossbeam connecting parts;

[0007] The rear bumper skin is connected to the rear step skin; the rear step frame and the rear bumper skin are connected by bolts;

[0008] An outer connecting bracket and an inner connecting bracket are installed at both ends of the rear bumper skin; the rear step connecting bracket is connected to the rear step frame and the rear bumper frame respectively, the rear bumper frame is connected to the first end of the frame reinforcement through the rear bumper frame connecting member, and the second end of the frame reinforcement is fixed to the frame;

[0009] Two rear step skin connecting brackets are installed near the middle of the rear bumper skin; the trailer hook rear cross beam and the trailer hook front cross beam are fixedly connected; the two ends of the trailer hook rear cross beam and the two ends of the trailer hook front cross beam are respectively connected to the rear bumper frame; the two ends of the trailer hook rear cross beam are respectively connected to the first end of the cross beam connector, and the second end of the cross beam connector is connected to the rear bumper skin.

[0010] It should be further explained that the rear bumper frame connector is connected to the rear bumper frame by a plurality of bolts, and the second end of the frame reinforcement is fixed to the frame by welding;

[0011] The cross section of the rear bumper frame is U-shaped.

[0012] It should be further explained that the trailer hook is fixedly connected to the trailer hook front cross beam, and the trailer hook rear cross beam and the trailer hook front cross beam are connected by welding.

[0013] It should be further explained that the rear step connecting bracket is connected to the rear bumper frame by welding;

[0014] The rear step connecting bracket is connected to the rear step frame through bolts.

[0015] The rear bumper cover is connected to the rear step cover via buckles.

[0016] It should be further explained that two rear bumper skin connectors are installed on the rear step frame; the rear bumper skin connectors are connected to the rear step frame by welding.

[0017] It should be further explained that the outer connecting bracket and the inner connecting bracket are connected to the rear bumper skin by welding or bolting.

[0018] It should be further explained that the trailer hook rear cross beam and the trailer hook front cross beam are connected by welding; and the second end of the cross beam connector is connected to the rear bumper skin by bolts.

[0019] The present invention also provides a method for designing a rear bumper structure of an electric pickup truck, the method comprising:

[0020] The energy absorption force transmission path of the electric pickup truck rear bumper assembly is divided into three energy absorption sections;

[0021] The energy absorbing section is defined as the first energy absorbing section, the second energy absorbing section and the third energy absorbing section from the rear to the front of the vehicle frame. The first energy absorbing section includes: the rear step frame, the second energy absorbing section includes: the rear bumper frame, and the third energy absorbing section includes: the vehicle frame.

[0022] Assign crushable distance: The crushable distance L assigned to the rear bumper assembly is set to be smaller than the distance from the rear step frame to the vehicle controller;

[0023] The rear collision distribution strategy includes:

[0024] (a): According to formula E t =E f -E dis Get the total energy absorption target value E of the vehicle t ;according to Get the initial total energy E f ;E dis is the friction dissipation energy between the barrier vehicle and the prototype vehicle and the ground, the internal friction dissipation energy and other dissipated energy; m is the mass of the standard barrier vehicle under the rear collision working condition, and v is the speed of the barrier vehicle under the standard working condition;

[0025] (b): According to the formula E0=E t -E h Get the energy absorption value E0 of the force transmission path of the rear bumper assembly and the frame; E h Energy absorption values ​​assigned to other force transmission paths;

[0026] (c): Determine the energy targets E1, E2, and E3 absorbed by each segment through the energy pre-allocation ratio;

[0027] Taking the lower limit target value of the average crushing force of the rear bumper frame and the bending moment borne by the rear bumper frame as input, the topology design of the rear bumper frame section is carried out, and the rear bumper frame is designed in combination with the process;

[0028] A crush simulation is performed on the designed rear bumper frame to extract the average crush force of the rear bumper frame, and the average crush force of the rear bumper frame is greater than the lower limit target value;

[0029] (d): According to Get the average crushing force lower limit target value F g ; L is the maximum crushable distance of the second energy absorbing section, η is the energy absorption efficiency;

[0030] (e): If the average crushing force F extracted from the second energy absorption section in the simulation is satisfied t >F g , the strength requirements are met.

[0031] The rear bumper assembly is calibrated under trampling and towing conditions to ensure that the rear bumper assembly meets the strength requirements.

[0032] It can be seen from the above technical solutions that the present invention has the following advantages:

[0033] The electric pickup truck rear bumper structure proposed in this invention sets energy absorption targets for the rear bumper frame based on a rear collision distribution strategy. It also allocates a crushable distance based on the safe clearance requirements of electrical components such as the controller. The rear bumper frame is designed using the optimized cross-section. Compression simulations of the rear bumper frame verify whether the crushing force meets the requirements, ultimately resulting in an optimal design. This provides a framework for forward-thinking electric pickup truck rear bumper design that considers electrical safety in rear collision conditions, significantly shortening development time and improving efficiency.

[0034] This invention not only considers electrical safety in rear-end collision conditions, but also meets the requirements for pedaling convenience and pedal strength. Furthermore, it is compatible with pickup truck frames and is easy to install and manufacture. Furthermore, simulations have verified that the structure ensures a safe space for the controller in rear-end collision conditions, preventing electrical leakage and short circuits in live components after a collision. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for the description. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 This is a schematic diagram of the spatial location of the electric components at the rear of the electric pickup truck;

[0037] Figure 2 This is a schematic diagram of the rear bumper structure of an electric pickup truck;

[0038] Figure 3 This is an exploded view of the rear fender structure of an electric pickup truck;

[0039] Figure 4 This is a schematic diagram of the rear bumper frame;

[0040] Figure 5 is a schematic cross-sectional view of the rear bumper frame;

[0041] Figure 6 This is a schematic diagram of an embodiment of the rear bumper structure of an electric pickup truck;

[0042] Figure 7 This is a schematic diagram of the energy absorption section of the rear bumper assembly of an electric pickup truck;

[0043] Figure 8 Flowchart of the design method for the rear bumper structure of an electric pickup truck. DETAILED DESCRIPTION

[0044] The electric pickup truck rear bumper structure provided by this invention is designed and developed based on the design method disclosed herein. Specifically, while meeting comprehensive requirements such as pedaling strength, trailer functionality, pedaling convenience, and process adaptability, designers must carefully consider boundary conditions and design the pickup truck rear bumper assembly to enable it to deform in the desired manner, ensuring sufficient rigidity and deformation stability, thereby ensuring sufficient space for live components.

[0045] 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.

[0046] See also Figures 1 to 6 The figure shows a schematic diagram of the rear bumper structure of an electric pickup truck in a specific embodiment. The present invention includes: a rear bumper assembly 102; the rear bumper assembly and the vehicle controller are respectively installed on the frame, and the rear bumper assembly is arranged at the end of the frame; in the present invention, the rear bumper assembly plays a role in protecting the vehicle controller, and the vehicle controller can be a four-in-one controller, and of course can also include other electrical equipment of the vehicle.

[0047] According to an embodiment of the present application, the rear bumper assembly includes: a rear step skin 1, a rear bumper skin 2, a rear step frame 3, a rear step connecting bracket 6, a trailer hook rear cross beam 8, a trailer hook front cross beam 9, a rear bumper frame 11, a rear bumper frame connector 12, a frame reinforcement 13 and two cross beam connectors 14.

[0048] The rear bumper skin 2 is connected to the rear step skin 1; for example, the rear step skin 1 and the rear bumper skin 2 are respectively provided with a plurality of clips, and the rear step skin 1 and the rear bumper skin 2 are connected by the clips. The rear step frame 3 and the rear bumper skin 2 are connected by bolts at the four corners and the middle. Two rear bumper skin connectors 15 are installed on the rear step frame 3; the rear bumper skin connector 15 and the rear step frame 3 are connected by welding. The outer connecting bracket 4 and the inner connecting bracket 5 are connected to the rear bumper skin 2 by welding or bolting.

[0049] The rear step connecting bracket 6 is connected to the rear step frame 3 and the rear bumper frame 11 respectively. The rear bumper frame connector 12 is bolted to the rear bumper frame 11. The frame reinforcement 13 is welded to the side of the frame. The rear bumper frame connector 12 connects the rear bumper assembly to the frame, avoiding modifications to the frame and reducing manufacturing costs. The frame reinforcement 13 is welded to the frame to strengthen the frame structure.

[0050] In this embodiment, the rear step connecting bracket 6 is connected to the rear bumper frame 11 by welding; the rear step connecting bracket 6 is connected to the rear step frame 3 by bolts.

[0051] Two rear step skin connecting brackets 7 are installed near the middle of the rear bumper skin 2; the trailer hook rear cross beam 8 and the trailer hook front cross beam 9 are fixedly connected; the two ends of the trailer hook rear cross beam 8 and the two ends of the trailer hook front cross beam 9 are respectively connected to the rear bumper frame; the two ends of the trailer hook rear cross beam 8 are respectively connected to the first end of the cross beam connector 14, and the second end of the cross beam connector 14 is connected to the rear bumper skin 2.

[0052] In an exemplary embodiment, the rear bumper frame 11 is a U-shaped structure. The rear bumper frame 11, the rear step connecting bracket 6, the trailer hook rear cross beam 8, the trailer hook front cross beam 9, and the rear bumper frame connecting member 12 form a structural entity that withstands longitudinal collision forces. During the collision process, the structure can provide relatively stable support to avoid large bending deformation and instability.

[0053] The rear step frame 3, outer connecting bracket 4, inner connecting bracket 5, and rear step connecting bracket 6 transmit the pedaling force to the frame. The rear bumper assembly bears the pedaling force, meets strength requirements, and can evenly distribute and transmit the pedaling force to the frame. The size is coordinated to ensure that the height meets the pedaling convenience.

[0054] The rear step frame 3, rear step skin 1, rear bumper skin 2, external connecting bracket 4, internal connecting bracket 5 and rear step skin connecting bracket 7 can transfer force to the rear bumper frame 11 more stably when a rear collision occurs, and avoid large bending and twisting to ensure a safe space for the rear live components.

[0055] The frame reinforcement 13 of the present invention can strengthen the area of ​​the frame that is prone to bending, thereby preventing the area from being greatly deformed and causing the rear pedal to rotate forward and collide with live components.

[0056] The rear bumper frame connector 12 is welded to the vehicle frame at its upper end and bolted to the rear bumper frame 11 at its lower end, thus connecting the entire rear bumper structure to the vehicle frame. This connection method is also easy to manufacture and install. The four bolts are evenly distributed on the rear bumper frame connector 12 to prevent significant local deformation and bolt pullout during rear-end collisions. The trailer hook front crossmember 9 and trailer hook rear crossmember 8 are welded together, providing sufficient strength to ensure the use of the trailer function.

[0057] The following is an embodiment of a method for designing a rear bumper structure for an electric pickup truck provided in an embodiment of the present disclosure. This method and the rear bumper structures for electric pickup trucks in the above-mentioned embodiments belong to the same inventive concept. For details not fully described in the embodiment of the method for designing a rear bumper structure for an electric pickup truck, reference can be made to the above-mentioned embodiments of the rear bumper structure for an electric pickup truck.

[0058] like Figure 7 and 8 As shown, the method divides the energy absorption force transmission path of the electric pickup truck rear bumper assembly into three energy absorption sections.

[0059] The energy absorption sections are defined from rear to front based on the vehicle frame as the first energy absorption section I, the second energy absorption section II and the third energy absorption section III. The first energy absorption section I includes: the rear step frame, the second energy absorption section II includes: the rear bumper frame, and the third energy absorption section III includes: the vehicle frame; the corresponding energy absorption values ​​are E1, E2, and E3, and the distribution ratio is set.

[0060] Specifically, according to the formula Get the total kinetic energy E f .

[0061] Where m is the mass of the standard barrier vehicle under the rear collision condition, 1100 kg, v is the speed of the barrier vehicle under the standard condition, 50 km / h, and the calculated initial total kinetic energy is 106.1 kJ.

[0062] E dis is the friction dissipation energy between the barrier vehicle and the prototype vehicle and the ground, the internal friction dissipation energy and other dissipated energy, which is an engineering statistical value. That is 35.4kJ. Get E t It is 70.7kJ.

[0063] In an embodiment of the method of the present invention, during a rear collision, the main force transmission paths are:

[0064] ① From the rear bumper assembly to the frame;

[0065] ② From the rear cargo box to the vehicle body.

[0066] Here, corresponding to E0 and E hThe distribution ratio is set to 3:2. The resulting E0 is 42.4 kJ. E0 is composed of the energy targets E1, E2, and E3 absorbed by the three energy absorption segments, with the distribution ratio set to 2:6:3. The final energy absorption target E2 for the second energy absorption segment is 23.1 kJ.

[0067] According to the formula L is the maximum crushable distance of the second energy-absorbing section, that is, the distance in the collision direction between the rear pedal frame and the four-in-one controller, which is 135 mm. The energy absorption efficiency η is 0.8. Therefore, the target lower limit of the average crushing force of the second energy-absorbing section is 213.9 kN.

[0068] In the embodiment of the present invention, the upper end of the cross section is constrained at the welding point between the second energy absorbing section and the frame, and a force F is applied. g And bending moment M. Bending moment M is F g *(H 车架 -H 后踏 ), rear step height H 后踏 Determined by the convenience of pedaling, it is 600mm, and the frame height H 车架 It is 730mm.

[0069] The original cross-section area is set as a rectangular area with a width of 66mm and a height of 145mm. The material removal rate is set to 70% to 90%. Finally, the second energy-absorbing section structure assembly is obtained by combining the optimized cross-section and process requirements. The main energy-absorbing components include the rear bumper frame and the rear bumper frame connector 12. Figure 4 and Figure 7 The overall cross-section of the rear bumper frame is an inverted U-shape, which is not prone to instability and has good bending and torsion resistance. It is connected to the rear bumper frame connector 12 by four bolts and then welded to the frame, and has sufficient rigidity.

[0070] In the method of the present invention, a crush simulation model is created to calculate the average crush force of the rear bumper frame, which is then compared with the average crush force target. After verification, the design solution is established.

[0071] Perform rear impact simulation to verify the safe space of live components and check the deformation of each segment.

[0072] A pedaling simulation model was created, with an 80kg adult pedaling with one foot in the middle of the rear pedal as the boundary condition, to verify the structural strength.

[0073] A trailer operation simulation model was created, with a load equal to half the vehicle's curb weight used as the boundary condition to verify the structural strength.

[0074] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0075] Based on the above design method, the present invention sets energy absorption targets for the rear bumper frame according to the rear collision distribution strategy. It also allocates crushable distances based on the safety clearance requirements of electrical components such as the four-in-one controller. The rear bumper frame is designed using the optimized cross-section. Compression simulations of the rear bumper frame verify whether the crushing force meets the requirements, ultimately resulting in an optimal design. This provides a framework for the forward design of electric pickup truck rear bumper structures while also considering electrical safety in rear collision conditions, significantly shortening development time and improving efficiency.

[0076] This invention not only meets the electrical safety requirements for rear-end collisions, but also takes into account pedaling convenience and pedaling strength. It also adapts to pickup truck frames, simplifies the process, and significantly reduces development costs. Simulations have verified that the novel electric pickup truck rear bumper structure ensures a safe space for the four-in-one controller in rear-end collisions, preventing leakage and short circuits in these live components.

[0077] The terms "first," "second," "third," "fourth," and so forth (if any) in the description and claims of the present invention and in the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present invention described herein can be implemented in orders other than those illustrated or described herein. In addition, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions.

[0078] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for designing a rear bumper structure for an electric pickup truck, characterized in that: The method is used to design the rear bumper structure of an electric pickup truck; The rear protection structure of the electric pickup truck includes: a rear bumper assembly; the rear bumper assembly and the vehicle controller are respectively mounted on the vehicle frame, and the rear bumper assembly is arranged at the end of the vehicle frame; The rear bumper assembly includes: a rear step skin (1), a rear bumper skin (2), a rear step frame (3), a rear step connecting bracket (6), a trailer hook rear cross beam (8), a trailer hook front cross beam (9), a rear bumper frame (11), a rear bumper frame connecting member (12), a frame reinforcement (13) and two cross beam connecting members (14); The rear bumper skin (2) is connected to the rear step skin (1); the rear step frame (3) and the rear bumper skin (2) are connected by bolts; Both ends of the rear bumper skin (2) are equipped with an outer connecting bracket (4) and an inner connecting bracket (5); the rear step connecting bracket (6) is connected to the rear step frame (3) and the rear bumper frame (11) respectively; the rear bumper frame (11) is connected to the first end of the frame reinforcement (13) through the rear bumper frame connecting member (12); the second end of the frame reinforcement (13) is fixed to the frame; Two rear step skin connection brackets (7) are installed near the middle of the rear bumper skin (2); The trailer hook rear cross beam (8) and the trailer hook front cross beam (9) are fixedly connected; both ends of the trailer hook rear cross beam (8) are respectively connected to the rear bumper frame; Both ends of the trailer hook front cross beam (9) are connected to the rear bumper frame respectively; The two ends of the trailer hook rear cross beam (8) are respectively connected to the first end of the cross beam connector (14), and the second end of the cross beam connector (14) is connected to the rear bumper skin (2); Methods include: The energy absorption force transmission path of the electric pickup truck rear bumper assembly is divided into three energy absorption sections; The energy absorbing section is defined as the first energy absorbing section, the second energy absorbing section and the third energy absorbing section from the rear to the front of the vehicle frame. The first energy absorbing section includes: the rear step frame, the second energy absorbing section includes: the rear bumper frame, and the third energy absorbing section includes: the vehicle frame. Assign crushable distance: The crushable distance L assigned to the rear bumper assembly is set to be smaller than the distance from the rear step frame to the vehicle controller; The rear collision distribution strategy includes: (a): According to formula E t =E f -E dis Get the total energy absorption target value E of the vehicle t According to E f = Get the initial total energy E f ;E dis is the friction dissipation energy between the barrier vehicle and the prototype vehicle and the ground, the internal friction dissipation energy, and other dissipated energy; m is the mass of the standard barrier vehicle under the rear collision condition, and v is the speed of the standard barrier vehicle under this condition; (b): According to the formula E0=E t -E h Get the energy absorption value E0 of the force transmission path of the rear bumper assembly and the frame; E h Energy absorption values ​​assigned to other force transmission paths; (c): Determine the energy targets E1, E2, and E3 absorbed by each segment through the energy pre-allocation ratio; Taking the lower limit target value of the average crushing force of the rear bumper frame and the bending moment borne by the rear bumper frame as input, the topology design of the rear bumper frame section is carried out, and the rear bumper frame is designed in combination with the process; A crush simulation is performed on the designed rear bumper frame to extract the average crush force of the rear bumper frame, and the average crush force of the rear bumper frame is greater than the lower limit target value; (d): According to F g = Get the average crushing force lower limit target value F g ; is the maximum crushable distance of the second energy absorbing section, is the energy absorption efficiency; (e): If the average crushing force F extracted from the second energy absorption section in the simulation is satisfied t >F g , then the strength requirements are met.

2. The electric pickup truck rear bumper design method according to claim 1, characterized in that: The rear bumper frame connecting member (12) is connected to the rear bumper frame (11) via a plurality of bolts, and the second end of the frame reinforcement member (13) is fixed to the frame by welding; The cross section of the rear bumper frame (11) is U-shaped.

3. The electric pickup truck rear bumper design method according to claim 1, characterized in that: A trailer hook (10) is fixedly connected to the trailer hook front crossbeam (9), and the trailer hook rear crossbeam (8) and the trailer hook front crossbeam (9) are connected by welding.

4. The electric pickup truck rear bumper design method according to claim 1, characterized in that: The rear step connecting bracket (6) is connected to the rear bumper frame (11) by welding; The rear step connection bracket (6) is connected to the rear step frame (3) via bolts.

5. The electric pickup truck rear bumper design method according to claim 1, characterized in that: The rear bumper skin (2) and the rear step skin (1) are connected via a buckle.

6. The electric pickup truck rear bumper design method according to claim 1, characterized in that: Two rear bumper skin connectors (15) are mounted on the rear step frame (3); The rear bumper skin connector (15) is connected to the rear step frame (3) by welding.

7. The electric pickup truck rear bumper design method according to claim 1, characterized in that: The outer connecting bracket (4) and the inner connecting bracket (5) are connected to the rear bumper skin (2) by welding or bolting.

8. The electric pickup truck rear bumper design method according to claim 1, characterized in that: The trailer hook rear crossbeam (8) and the trailer hook front crossbeam (9) are connected by welding; The second end of the crossbeam connector (14) is connected to the rear bumper skin (2) via bolts.

9. The electric pickup truck rear bumper design method according to claim 1, characterized in that: The rear bumper assembly is calibrated under trampling and towing conditions to ensure that the rear bumper assembly meets the strength requirements.

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