CN112896330A - Steel vehicle body of pure electric vehicle - Google Patents

Abstract

The invention relates to the technical field of electric automobiles, in particular to a steel automobile body of a pure electric vehicle.A front floor assembly comprises a pair of front floor longitudinal beams; the front floor longitudinal beam is provided with a bending section bent from the lap edge towards the doorsill beam and a straight section arranged parallel to the doorsill beam; the front floor longitudinal beam is provided with a pair of first fixing points fixedly connected with the power battery, and the first fixing points are located at the bent section of the front floor longitudinal beam. According to the steel vehicle body of the pure electric vehicle, the steel vehicle body is adopted, so that the manufacturing cost and the processing difficulty are reduced; the front floor longitudinal beam in the front floor assembly is bent towards the direction of the threshold beam, so that the problem of interference between the front floor longitudinal beam and the power battery is solved, meanwhile, the pair of first fixing points are arranged at the front end of the power battery, the bending resistance of the bent section of the front floor longitudinal beam is improved by effectively utilizing the structural rigidity of the power battery, and the collision safety performance of the whole vehicle is improved.

Description

Steel vehicle body of pure electric vehicle

Technical Field

The invention relates to the technical field of electric automobiles, in particular to a steel automobile body of a pure electric automobile.

Background

With the continuous development of science and technology, an electric automobile as one of new energy automobiles is also rapidly developed along with the trend of environmental protection. Because the difference of the power assembly of the electric automobile and the traditional fuel automobile is large, the automobile body of the electric automobile needs to be changed greatly according to the difference of the power assembly. Aluminum vehicle bodies come into force, but the processing cost of the aluminum vehicle bodies is too high and the processing technology is not mature enough, so that the aluminum vehicle bodies of the electric vehicles are hesitant. Based on the defects of the pure aluminum vehicle body, the steel-aluminum hybrid vehicle body also becomes a hot spot of the current research and development, but the manufacturing cost and the connection technology of the steel-aluminum hybrid vehicle body are difficult problems to be solved urgently.

When the steel automobile body of traditional fuel automobile is applied to electric automobile, also have some problems, adopt big power battery and serious interference of floor longeron and lead to the problem of unable installation, adopt little power battery to lead to the not enough problem of battery continuation of the journey mileage secondly.

In the published patent CN107140026A, there is provided a longitudinal cross member structure of a lower body of an electric vehicle, in which a floor longitudinal member structure is eliminated for the arrangement of power batteries, thereby reducing a main force transmission path in a frontal collision. In this application, in order to satisfy the collision performance in a high-speed collision, the lap joint strength of the side members is increased and more and stronger cross members are added to transmit the collision force. Although the design solves the problem of interference between the floor longitudinal beam and the power battery, the design difficulty of the vehicle body structure and the weight and the processing cost of the vehicle body are greatly increased.

Disclosure of Invention

The invention aims to solve the problems that the existing electric automobile is high in processing cost and difficulty due to the adoption of an aluminum automobile body, and the battery endurance mileage is insufficient due to the fact that a traditional steel automobile body is adopted and a small power battery needs to be selected because a time plate longitudinal beam and the power battery are seriously interfered.

The technical scheme adopted by the invention for solving the technical problems is as follows: a steel vehicle body of a pure electric vehicle comprises a front vehicle body assembly, a front floor assembly and a rear floor assembly which are sequentially arranged from front to back, wherein the front vehicle body assembly comprises a pair of front longitudinal beams, a front wall plate cross beam and a pair of threshold beams; the front ends of the pair of front floor longitudinal beams and the pair of front longitudinal beams are lapped on the front panel cross beam to form two lapping edges, and the rear ends of the pair of front floor longitudinal beams and the pair of rear floor longitudinal beams are lapped on the rear floor cross beam; the front floor longitudinal beam is provided with a bending section bent from the lap joint edge towards the threshold beam and a straight section arranged parallel to the threshold beam; the front floor assembly and the rear floor assembly are provided with spaces for placing power batteries, the front floor longitudinal beam is provided with a pair of first fixing points fixedly connected with the power batteries, and the first fixing points are located at the bending section of the front floor longitudinal beam.

Furthermore, at least two pairs of second fixing points fixedly connected with the power battery are further arranged on the front floor longitudinal beam, and the second fixing points are located on the straight line section of the front floor longitudinal beam.

Further, the front floor stringer comprises a front floor stringer body with a curved section and a straight section, a cover plate arranged on the front floor stringer body, and a reinforcement located inside the front floor stringer body.

Specifically, the cover plate is located at the bent section, and the reinforcing piece is located at the bent section and extends to the middle of the straight section.

Further, the front floor assembly further comprises a front floor beam fixedly connected between the bent sections of the two front floor beams.

Specifically, the front body assembly further comprises a pair of a-pillars located on both sides of the front cowl cross member for connecting the front cowl cross member and the pair of rocker beams, and the front floor assembly further comprises a pair of front floor cross member reinforcements located at the bent sections of the front floor side members for fixedly connecting the front floor cross member with the a-pillars.

Specifically, the front floor assembly further comprises two front seat mounting cross beams spanning between the pair of front floor longitudinal beams, and two ends of the two front seat mounting cross beams are fixed to straight line sections of the front floor longitudinal beams.

Specifically, the front floor assembly further comprises a front floor body and a middle channel fixed above the front floor body, wherein the middle channel comprises a first connecting section fixedly connected with the front wall beam, a second connecting section fixedly connected with the front wall beam, a third connecting section fixedly connected with the two front seat mounting beams and a fourth connecting section fixedly connected with the rear floor beam, which are sequentially arranged.

Specifically, the height of the middle channel gradually decreases from the first connecting section to the fourth connecting section, and the fourth connecting section is arranged above the front floor body in a flat plate shape.

Further, the front floor assembly further includes a side reinforcement secured between the front floor stringer and the threshold beam.

The steel vehicle body of the pure electric vehicle has the beneficial effects that: the whole vehicle adopts a steel vehicle body, so that the manufacturing cost and the processing difficulty are greatly reduced compared with an aluminum vehicle body on the premise of meeting the collision performance; the front floor longitudinal beam in the front floor assembly is bent towards the direction of the threshold beam, so that the problem of interference between the front floor longitudinal beam and the power battery is solved, meanwhile, the front end of the power battery is provided with a pair of first fixed points, the first fixed points are located on the bent section of the front floor longitudinal beam, the power battery is added into a longitudinal force transmission channel of a vehicle body by utilizing the connection of the first fixed points and the front power assembly, so that the bending resistance of the bent section of the front floor longitudinal beam can be effectively improved by utilizing the structural rigidity of the power battery, the problem of insufficient transmission of the collision force of the bent section of the front floor longitudinal beam is solved, and the collision safety performance of the whole vehicle is improved.

Drawings

FIG. 1 is a schematic perspective view of a steel vehicle body (except for a front floor body) of a pure electric vehicle provided by the invention;

FIG. 2 is a top view of a steel vehicle body of a pure electric vehicle provided by the invention;

FIG. 3 is a cross-sectional view taken at A-A of FIG. 2;

FIG. 4 is a bottom view of a steel vehicle body of a pure electric vehicle provided by the invention;

FIG. 5 is a cross-sectional view taken at B-B of FIG. 4;

FIG. 6 is a side view of a front floor rail of a steel vehicle body of a pure electric vehicle provided by the invention;

FIG. 7 is a cross-sectional view taken at C-C of FIG. 6;

FIG. 8 is a partial top view of a front floor rail of a steel vehicle body for a full electric vehicle provided in accordance with the present invention;

FIG. 9 is a side view of a center tunnel of a steel vehicle body for a full electric vehicle provided by the present invention;

FIG. 10 is a schematic perspective view of a front floor beam and a front floor beam reinforcement of a steel vehicle body of a pure electric vehicle provided by the invention;

FIG. 11 is a schematic perspective view of a side reinforcement of a steel vehicle body of a pure electric vehicle according to the present invention;

fig. 12 is a bottom view of a pure electric vehicle provided with a power battery mounted in a steel vehicle body.

In the figure: 100-pure electric vehicle steel body structure;

10-a front vehicle body assembly, 11-a front longitudinal beam, 12-a front coaming cross beam, 13-A column and 14-a sill beam;

20-front floor assembly, 21-front floor stringer, 211-lap, 212-curved section, 213-straight section, 214-front floor stringer body, 215-cover plate, 216-reinforcement, 22-front floor body, 23-center channel, 231-first connecting section, 232-second connecting section, 233-third connecting section, 234-fourth connecting section, 24-front floor beam, 25-front floor beam reinforcement, 26-front seat mounting beam, 27-side reinforcement;

30-rear floor assembly, 31-rear floor longitudinal beam and 32-rear floor cross beam;

40-power battery, 41-first fixing point and 42-second fixing point.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1 to 12, a steel vehicle body 100 for a pure electric vehicle provided by the invention comprises a front vehicle body assembly 10, a front floor assembly 20 and a rear floor assembly 30 which are arranged in sequence from front to back. The front vehicle body assembly 10, the front floor assembly 20 and the rear floor assembly 30 in the whole vehicle body are made of steel, and the installation of the power assembly is creatively improved on the traditional steel vehicle body, so that a power battery with larger size can be placed on the power assembly. Compared with the existing pure electric aluminum vehicle body, the pure electric vehicle steel vehicle body 100 provided by the invention greatly reduces the processing cost, adopts the original components which can be used in the traditional fuel oil vehicle as much as possible, reduces the investment cost of new products in the development of the vehicle body, and reduces the processing process difficulty compared with the existing steel-aluminum mixed vehicle body. In addition, the steel vehicle body 100 can greatly improve the collision performance of the whole vehicle and improve the safety performance of the pure electric vehicle.

Specifically, as shown in fig. 1, the front body assembly 10 in this all-electric-steel vehicle body 100 includes a pair of front side members 11, a cowl cross member 12, a pair of a-pillars 13, and a pair of rocker beams 14. A pair of a-pillars 13 are located on both sides of the dash cross-member 12 for connecting the dash cross-member 12 and a pair of rocker beams 14. The rear floor assembly 30 includes a pair of rear floor frames 31 and a rear floor cross member 32 disposed between the pair of rear floor frames 31. The front floor assembly 20 is connected between the front body assembly 10 and the rear floor assembly 30, and solves the problem that a large power battery pack cannot be put in the conventional fuel automobile due to the interference between the front floor assembly 20 and the power battery 40.

Further, as shown in fig. 2 and 3, the front floor assembly 20 includes a pair of front floor stringers 21, a front floor body 22, and a center tunnel 23 fixed above the front floor body 22; the front ends of the pair of front floor frames 21 and the pair of front side frames 11 are overlapped with the dash cross member 12 to form two overlapping edges 211, and the rear ends of the pair of front floor frames 21 and the pair of rear floor frames 31 are overlapped with the rear floor cross member 32. As shown in fig. 6, the front floor stringer 21 of the present invention has a curved section 212 bent from the overlapping edge 211 toward the rocker beam 14 and a straight section 213 disposed parallel to the rocker beam 14. The front floor side member 21 of the front floor assembly 20 is bent to both sides and the bottom of the vehicle body from the overlapping edge 211 near one end of the front vehicle body assembly 10, i.e. the front dash cross member 12, and the straight line segment 213 of the front floor side member 21 is directly widened to the inner side of the threshold beam 14, so that the relative position between the pair of front floor side members 21 is improved to the maximum extent, and the space for placing the battery pack can be enlarged, so that the steel vehicle body 100 can accommodate the large power battery 40. The pure electric steel vehicle body 100 provided in the embodiment can arrange the power battery 40 with the length of 1900mm and the width of 1060mm, so that the endurance mileage of the pure electric vehicle can reach over 500 KM.

As shown in fig. 4 and 12, a space for placing the power battery 40 is provided in the bottom space of the front floor assembly 20 and the rear floor assembly 30. Since the front floor side member 21 of the front floor assembly 20 is bent toward both sides, the inner width of the front floor assembly 20 is increased, thereby solving the problem of interference between the front floor side member 21 and the power battery 40. Meanwhile, a pair of first fixing points 41 fixedly connected with the power battery 40 are arranged on the front floor longitudinal beam 21, and the first fixing points 41 are positioned on the bent section 212 of the front floor longitudinal beam 21. Since the front floor side member 21 has a large angle of deviation in the direction in which the overlapping side 211 thereof starts to face the rocker beam 14 side, the larger the angle of deviation, there is caused a problem that the longitudinal force transmission of the front floor side member 21 at the bent portion 212 thereof is not smooth. Therefore, in the present invention, the front floor side member 21 is provided with the pair of first fixing points 41 for connecting to the power battery 40 at the bent portion 212 thereof, and the collision force is efficiently transmitted and dispersed by the first fixing points 41, and the first fixing points 41 make full use of the structural rigidity of the power battery 40, thereby compensating for the problem of poor transmission of force in the region of the bent portion 212 of the front floor side member 21, indirectly increasing the rigidity of the entire front floor side member 21, and preventing the bent portion 212 from being bent and deformed even when a strong impact is applied thereto.

Further, as shown in fig. 4 and 12, at least two pairs of second fixing points 42 fixedly connected with the power battery 40 are further provided on the front floor longitudinal beam 21, and the second fixing points 42 are located on the straight line sections 213 of the front floor longitudinal beam 21. In the embodiment, eight second fixing points 42 are uniformly distributed on the pair of front floor longitudinal beams 21, and the eight second fixing points 42 are used for firmly fixing the power battery 40 inside the front floor assembly 20 and the rear floor assembly 30, so as to ensure the connection stability of the power battery 40 with the front floor assembly 20 and the rear floor assembly 30.

Further, in the present embodiment, as shown in fig. 7, in order to ensure the overall rigidity and strength of the front floor rail 21 in the front floor assembly 20, the front floor rail 21 includes a front floor rail body 214 having a curved section 212 and a straight section 213, a cover plate 215 provided on the front floor rail body 214, and a reinforcement 216 located inside the front floor rail body 214. The cover plate 215 and the reinforcement 216 are provided to improve the overall strength of the front floor side member body 214. The front floor longitudinal beam body 214 is a bent piece with an upward U-shaped opening, the cover plate 215 is disposed above the front floor longitudinal beam body 214 and located at the opening, and the cover plate 215 and the front floor longitudinal beam body 214 are connected in a curved surface matching welding manner. The reinforcement 216 of the front floor side member 21 is fixed by welding to the inside of the U-shaped bent piece of the front floor side member body 214.

Specifically, as shown in fig. 8, the cover plate 215 in the front floor stringer 21 is located at the curved section 212, and the reinforcement 216 is located at the curved section 212 and extends to the middle of the straight section 213. The cover plate 215 is provided in the region of the bending section 212 between the dash cross member 12 and the rocker cross member 14, mainly to ensure the rigidity and strength of the front floor rail 21 at the point where it has a large bending deflection. The reinforcement 216 also extends from the front cowl cross member 12 to the middle of the straight line section 213, and the reinforcement 216 can improve the strength and rigidity of the curved section 212 of the front floor side member 21, improve the rigidity of the straight line section 212 of the front floor side member 21, and further improve the collision performance of the front floor side member 21 in the event of a column collision.

Further, as shown in fig. 1 and 10, the front floor assembly 20 further includes a front floor cross member 24 fixedly connected between the curved sections 212 of the two front floor stringers 21. The front floor cross member 24 is used to improve the transmission and dispersion of the force of the pair of front floor frames 21, and the longitudinal collision force can be transmitted laterally through the front floor cross member 24. The front floor cross member 24 has a middle section 241 and connecting sections 242 connected to the pair of front floor side members 21 on both sides, respectively.

Specifically, as shown in fig. 5, the front floor assembly 20 further includes a pair of front floor cross member reinforcements 25, and the front floor cross member reinforcements 25 are located at the bent sections 212 of the front floor stringers 21 to fixedly connect the front floor cross member 24 with the a-pillar 13. On the one hand, the front floor cross reinforcement 25 connects the front floor side member 21 with the a-pillar 13, and during a frontal collision of the vehicle, the front floor side member 21 receives most of the collision force from the front side member 11 and the collision force from the sub-frame, and is a main passage for transmitting the force in the longitudinal direction, and the front floor side member 21 distributes the collision force to the a-pillar 13 and the rocker beam 14 via the front floor cross reinforcement 25, and efficiently transmits and distributes the collision force. On the other hand, the front floor cross member reinforcement 25 may connect the front floor cross member 24 with the a-pillar 13, thereby dispersing the longitudinal collision force to the center tunnel 23 through the front floor cross member 24, further dispersing and transmitting the collision force.

Further, as shown in fig. 2, the front floor assembly 20 of the present invention further includes two front seat mounting cross members 26 spanning between the pair of front floor frames 21, and both ends of the two front seat mounting cross members 26 are fixed to the straight sections 213 of the front floor frames 21. The front seat mounting cross member 26 is disposed above the front floor body 22, and the center tunnel 23 is vertically disposed on the two front seat mounting cross members 26.

As shown in fig. 1, 2 and 9, the front floor assembly 20 of the present invention further includes a front floor body 22 and a middle channel 23 fixed above the front floor body 22, wherein the middle channel 23 includes a first connecting section 231 fixedly connected to the dash cross member 12, a second connecting section 232 fixedly connected to the front floor cross member 24, a third connecting section 233 fixedly connected to the two front seat mounting cross members 26, and a fourth connecting section 234 fixedly connected to the rear floor cross member 32, which are sequentially disposed. The center tunnel 23 is formed above the front floor body 22 and is located on a center axis in the longitudinal direction of the front floor body 22. The front end of the middle channel 23 is fixed on the dash cross member 12 in a tilting manner, the rear end is fixed on the rear floor cross member 32 in a flat plate shape, and the middle part is tightly attached to the front floor body 22 from the front floor cross member 24 to the two front seat mounting cross members 26. As is apparent from a comparison of fig. 3 and 5, the height of the center tunnel 23 gradually decreases, thereby increasing the space inside the passenger compartment.

Specifically, as shown in fig. 1, the pure electric steel body 100 provided by the invention is suitable for being used in a pure electric vehicle, so that an exhaust system of a conventional fuel automobile is not required to be arranged in the middle channel 23, and the overall height of the middle channel 23 can be reduced as much as possible on the premise of ensuring the connection rigidity and strength. The height of the middle channel 23 gradually decreases from the first connecting section 231 to the fourth connecting section 234, and the fourth connecting section 234 is disposed above the front floor body 22 in a flat plate shape. The height of the fourth connecting section 234 is reduced to the minimum as much as possible, so that the space of the aisle of the seats behind the passenger compartment is increased, and the comfort of the seats in the middle of the passenger compartment is improved.

Further, as shown in fig. 4, the front floor assembly 20 of the present invention further includes a side reinforcement 27 fixed between the front floor side member 21 and the rocker member 14. The side reinforcement 27 is provided in the area of the straight line section 213 of the front floor side member 21, and has a plurality of side reinforcements 27 for improving the stability between the front floor side member 21 and the rocker beam 14 and improving the collision performance of a pillar collision. As shown in fig. 11, the side reinforcement 27 has a reinforcement body 271 provided between the rocker beam 14 and the front floor side member 21, and a first welded end 272 connected to the rocker beam 14 and a second welded end 273 connected to the front floor side member 21. The first welding end 272 and the second welding end 273 are fixed by spot welding.

Further, as shown in fig. 1 and fig. 2, when a frontal collision occurs, the steel vehicle body 100 of the pure electric vehicle according to the present invention transmits and disperses force through the following paths, specifically, the force transmission channels are as follows:

first longitudinal force transfer channel: front longitudinal beam 11-front floor longitudinal beam 21-first fixing point 41-power battery 40-second fixing point 42;

a second longitudinal force transfer channel: front side rail 11-front floor rail 21-front floor cross reinforcement 25-a-pillar 13-rocker beam 14;

a third longitudinal force transfer channel: front longitudinal beam 11, front bulkhead cross member 12, center tunnel 23; front longitudinal beam 11, front dash cross beam 12, A-pillar 13, threshold beam 14;

a fourth longitudinal force transfer channel: front longitudinal beam 11-front floor longitudinal beam 21-front floor transverse beam 24-middle channel 23;

first transverse force transfer channel: front longitudinal beam 11-front bulkhead beam 12-A column 13;

a second transverse force transfer channel: front longitudinal beam 11-front floor longitudinal beam 21-front floor cross beam 24-front floor cross beam reinforcement 25-a-pillar 13;

a third transverse force transfer channel: front side member 11-front floor side member 21-side reinforcement 27-rocker beam 14.

Through the longitudinal force transmission channel and the transverse force transmission channel, the front collision force can be transmitted to each part of the rear part of the vehicle body, and particularly, the first longitudinal force transmission channel, the second longitudinal force transmission channel and the fourth longitudinal force transmission channel are required to transmit the force by the front floor longitudinal beam 21, so that the strength and the rigidity of the front floor longitudinal beam 21 directly influence the safety performance of the vehicle. In the front floor assembly 20 provided by the present invention, the front floor frame 21 is provided with the curved section 212 for placing the power battery 40, and the provision of the curved section 212 enlarges the width between the front floor frames 21, so that the power battery 40 with a larger capacity can be arranged. Meanwhile, the bending section 212 is connected with the power battery 40 through the first fixing point 41, and the problem of unsmooth force transmission in the bending area is solved by fully utilizing the structural rigidity of the power battery 40. Meanwhile, the front floor beam 24 and the front floor beam reinforcement 25 which are arranged on the bending section 212 can transversely transmit the force borne by the front floor longitudinal beam 21 to the A-pillar 13 and the threshold beam 14 on the side surface, so that the collision safety performance of the whole vehicle is improved. In addition, the height of the middle channel 23 in the front floor assembly 20 is reduced, the space of the passenger compartment is greatly improved, and the comfort of passengers is improved.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A pure electric vehicle steel body comprises a front vehicle body assembly, a front floor assembly and a rear floor assembly which are sequentially arranged from front to back, wherein the front vehicle body assembly comprises a pair of front longitudinal beams, a front wall plate cross beam and a pair of threshold beams;

the front ends of the pair of front floor longitudinal beams and the pair of front longitudinal beams are lapped on the front panel cross beam to form two lapping edges, and the rear ends of the pair of front floor longitudinal beams and the pair of rear floor longitudinal beams are lapped on the rear floor cross beam; the front floor longitudinal beam is provided with a bending section bent from the lap joint edge towards the threshold beam and a straight section arranged parallel to the threshold beam;

the front floor assembly and the rear floor assembly are provided with spaces for placing power batteries, the front floor longitudinal beam is provided with a pair of first fixing points fixedly connected with the power batteries, and the first fixing points are located at the bending section of the front floor longitudinal beam.

2. The steel vehicle body of the pure electric vehicle as claimed in claim 1, wherein at least two pairs of second fixing points fixedly connected with the power battery are further arranged on the front floor longitudinal beam, and the second fixing points are located on the straight line section of the front floor longitudinal beam.

3. The steel vehicle body for the pure electric vehicle as claimed in claim 1, wherein the front floor rail comprises a front floor rail body having a curved section and a straight section, a cover plate disposed on the front floor rail body, and a reinforcement member located inside the front floor rail body.

4. The steel vehicle body for the pure electric vehicle as claimed in claim 3, wherein the cover plate is located at the bent section, and the reinforcing member is located at the bent section and extends to the middle of the straight section.

5. The steel vehicle body of claim 1, wherein the front floor assembly further comprises a front floor cross member fixedly connected between the curved sections of the two front floor rails.

6. The steel vehicle body of claim 5, wherein the front body assembly further comprises a pair of A-pillars located on opposite sides of the front cowl cross member for connecting the front cowl cross member to a pair of rocker beams, and wherein the front floor assembly further comprises a pair of front floor cross member reinforcements located at the curved sections of the front floor side members for fixedly connecting the front floor cross member to the A-pillars.

7. The steel vehicle body of claim 5, wherein the front floor assembly further comprises two front seat mounting cross members spanning between the pair of front floor rails, and both ends of the two front seat mounting cross members are fixed to the straight sections of the front floor rails.

8. The steel vehicle body of claim 7, wherein the front floor assembly further comprises a front floor body and a middle channel fixed above the front floor body, and the middle channel comprises a first connecting section fixedly connected with the front wall cross beam, a second connecting section fixedly connected with the front floor cross beam, a third connecting section fixedly connected with the two front seat mounting cross beams, and a fourth connecting section fixedly connected with the rear floor cross beam, which are sequentially arranged.

9. The steel vehicle body for the pure electric vehicle as claimed in claim 8, wherein the height of the central channel gradually decreases from the first connecting section to the fourth connecting section, and the fourth connecting section is arranged above the front floor body in a flat plate shape.

10. The steel vehicle body of any one of claims 1-9, wherein the front floor assembly further comprises a side reinforcement secured between the front floor rail and the threshold beam.

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