CN217623792U - Connecting piece and vehicle body floor assembly - Google Patents

Abstract

The utility model provides a connecting piece and automobile body floor assembly. The connecting piece comprises a bulge, one end of the connecting piece is used for being connected with the threshold longitudinal beam, and the other end of the connecting piece is used for being connected with the floor longitudinal beam; wherein the bulge is used for forming a transmission chamber for transmitting force with the floor stringer and the floor. When the side collision happens, the collision force is effectively transmitted to the floor longitudinal beam and the floor through the threshold longitudinal beam, the situation that the living space of drivers and passengers is excessively occupied is avoided, the extrusion of the battery pack caused by the side collision is reduced or avoided, and the overall side collision safety performance of the vehicle is improved.

Description

Connecting piece and vehicle body floor assembly

Technical Field

The utility model relates to a but not limited to vehicle technical field especially relates to a connecting piece and automobile body floor assembly.

Background

The safety performance of automobile collision is receiving much attention, and the automobile collision is generally classified into frontal, side and rear collision, as well as rolling and pedestrian collision. In addition, with the rapid development of the new energy automobile market, a great amount of manpower and material resources are also put into research and development of new energy, hybrid automobiles and other automobiles in domestic and foreign enterprises. How to ensure the protection of the high voltage battery and the safety of the driver and passengers in different collision areas, particularly in side collisions, has become a focus of attention in the market and in the society.

The high-voltage storage battery is arranged under the floor of a vehicle body under the common conditions of new energy and hybrid electric vehicles, so that part of force transmission paths of the traditional vehicle type cannot be used, how to reasonably design a force transmission structure and meet the arrangement requirements, and the high-voltage storage battery can provide effective protection for passengers in the vehicle, and is a difficult problem to be met by designers.

In the side collision especially side post bumps the operating mode, new forms of energy motorcycle type conquassation space is less, and power transmission path is less or even lacks or breaks off, is difficult to effectively pass power in the side collision, and battery package and inside module receive behind the extrusion weeping easily, take place thermal runaway etc. to cause the incident.

The above description is included in the technical knowledge of the inventors, and does not necessarily constitute a prior art.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a connecting piece and automobile body floor assembly. This automobile body floor assembly has optimized holistic biography power route when colliding through setting up the connecting piece, has effectively improved the side impact performance of vehicle.

The embodiment of the utility model provides a technical scheme as follows:

a connecting piece comprises a bulge, wherein one end of the connecting piece is used for being connected with a threshold longitudinal beam, and the other end of the connecting piece is used for being connected with a floor longitudinal beam;

wherein the bulge is used for forming a transmission chamber for transmitting force with the floor stringer and the floor.

Through set up the connecting piece that links together both between threshold longeron and floor longeron, and make this connecting piece and floor longeron and floor constitute the transmission cavity that is used for the transmission power, make when taking place the side collision, the impact passes through the threshold longeron and transmits to floor longeron and floor effectively, avoids the excessive living space who occupies driver and crew, reduces or avoids the side to bump and causes the extrusion to the battery package, promotes the holistic side of vehicle and bumps the security performance.

In some exemplary embodiments, the connector further comprises a first flange and a second flange; the first flanging and the second flanging are respectively fixed to two opposite sides of the protrusion;

the first flanging, the protrusion and the second flanging form a shape like a Chinese character 'ji', the first flanging is used for being welded with the floor, and the second flanging is used for being welded with the floor.

The design structure of the connecting piece is refined, and the manufacturing difficulty is simplified while the performance requirement is met.

In some exemplary embodiments, the connecting member further includes a third flange fixed to the protrusion, and the third flange is located between the first flange and the second flange and is used for being welded to the sill rail.

Through setting up the third turn-ups in order to improve the joint strength of connecting piece and threshold longeron, guarantee the effective transmission of impact.

In some exemplary embodiments, the other end of the connecting member is configured to be in plug-in fit with the floor longitudinal beam, and is provided with a mounting hole for fixing with the floor longitudinal beam.

The universalization of the floor longitudinal beam is improved, the connecting piece is in plug-in fit with the floor longitudinal beam and is fixed in a screw joint mode, the fixing operation is simplified, the installation limit can be provided, and the assembly efficiency is improved.

In some exemplary embodiments, the connecting member is disposed obliquely, and one end of the connecting member near the sill rail is located at a rear side of the connecting member near the other end of the floor rail.

The one end of being connected the connecting piece with the threshold longeron sets up to compare the connecting piece and leans on the back with the floor longeron one end of being connected for the contained angle of connecting piece and floor longeron junction is the obtuse angle, improves structural strength, promotes the transmission effect of side impact force.

In some exemplary embodiments, the protrusion extends along a length direction of the connector and has a circular arc shape.

The protrusions are set to be arc-shaped, so that the mechanical property is improved, and the force transmission path is optimized.

In some exemplary embodiments, the other end of the connecting member near the floor side member is higher than the one end of the connecting member near the sill side member to form an escape passage.

The avoiding channel is arranged on the connecting piece, so that the universality of the connecting piece and the vehicle body floor assembly is improved, and the development cost of the whole vehicle is reduced.

In some exemplary embodiments, the protrusion is provided with a rib, and the rib is in a groove shape and extends along the length direction of the protrusion.

Through setting up the strengthening rib to improve the structural strength of connecting piece.

A vehicle body floor assembly comprising said floor panel, said sill rail, said floor rail and said connector of any of the above embodiments welded to said floor panel.

In some exemplary embodiments, two of the sill stringers, two of the floor stringers, and two of the connectors; the two threshold longitudinal beams are respectively arranged at two ends of the floor along the width of the vehicle body, and the two floor longitudinal beams are arranged between the two threshold longitudinal beams;

one of the connecting members connects one of the sill stringers and one of the floor stringers, and the other connecting member connects the other sill stringer and the other floor stringer.

Through setting up two connecting pieces, arrange respectively in the both ends of automobile body width to improve the anti ability of colliding of automobile body floor assembly left and right side.

Other aspects will be apparent upon reading and understanding the attached figures and detailed description.

Drawings

The accompanying drawings are included to provide a further understanding of the embodiments herein and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the embodiments herein.

FIG. 1 is an isometric view of a vehicle body floor assembly in some exemplary embodiments of the present invention;

fig. 2 is a schematic isometric view of a vehicle body floor assembly in some example embodiments of the invention;

fig. 3 is an isometric view of a connector in some exemplary embodiments of the invention;

fig. 4 is a schematic front view of a connector in some exemplary embodiments of the present invention;

fig. 5 is a schematic top view of a connector in some exemplary embodiments of the invention;

fig. 6 is a side view of a first connector in some exemplary embodiments of the invention;

fig. 7 is a side view of a second connector in some example embodiments of the invention.

Reference numerals:

1-floor, 11-middle channel reinforcing plate;

2-a doorsill longitudinal beam, 21-a front longitudinal beam, 22-a rear longitudinal beam, 23-a longitudinal beam reinforcing plate and 23 a-a hoisting hole;

3-floor stringer, 31-mounting point;

4-connecting piece, 40-bulge, 40 a-reinforcing rib, 40 b-mounting hole, 41-first flanging, 42-second flanging, 43-third flanging and 44-avoiding channel.

Detailed Description

The technical scheme is further explained by the specific implementation mode in combination with the attached drawings. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not to be construed as limitations.

In an embodiment of the present invention, as shown in fig. 1 to 7, a connecting member 4 is provided. The connecting piece 4 is welded on the floor 1, and two ends along the length of the connecting piece are respectively used for being connected with the threshold longitudinal beam 2 and the floor longitudinal beam 3. The connecting piece 4 comprises an upward projection 40. The two opposite ends of the connecting piece 4 can be respectively welded with the sill longitudinal beam 2 and the floor longitudinal beam 3.

As shown in fig. 1, only the left side portion of the floor panel 1, i.e., the side on which the driver seat is mounted and the side on which the passenger seat is mounted, are illustrated with reference to the arrangement. The sill stringer 2 and the floor stringer 3 can also be welded to the floor 1. As shown in the figure, the floor side member 3 is located inside the rocker side member 2 with a certain space therebetween in the vehicle width direction (Y direction). In general, the floor side member 3 is raised to a certain height in the height direction (Z direction) of the vehicle body, and the cross section of the floor side member 3 is formed like a letter "a little" to form a cavity with the floor panel 1. The connecting piece 4 can be set as a sheet metal part and is formed by punching. The cold stamping mode can be selected for forming, has higher dimensional stability and higher material utilization rate.

As shown in fig. 1 and 2, one end of the floor side member 3 is connected to the connecting member 4 along the longitudinal direction (X direction) of the vehicle body, and forms a transmission chamber for transmitting force with the floor panel 1. Wherein the protrusions 40 of the floor stringer 3 and the connector 4 both protrude towards the same side of the floor 1, both upwards as shown. In the whole product, the upper side is shown as the side close to the ground, and fig. 1 and 2 show the bottom view of welding the connecting element 4 on the floor 1.

The embodiment of the utility model provides an in, through setting up connecting piece 4 to link together threshold longeron 2 and floor longeron 3, and weld this connecting piece 4 on floor 1, with the transmission cavity that constitutes the side impact, with the transmission effect of effectively improving the side impact. Moreover, the integrity of a force transmission path in the frontal collision is effectively ensured. When the vehicle is in side collision, the collision force is effectively transmitted to the floor longitudinal beam 3 and the floor 1 through the threshold longitudinal beam 2, so that the collision object is prevented from excessively invading the living space of drivers and passengers, the extrusion of the battery pack caused by side collision is reduced or avoided, and the integral side collision safety performance of the vehicle is improved.

In some exemplary embodiments, as shown in fig. 1-7, the connector 4 further includes a first flange 41 and a second flange 42 secured to opposite sides of the projection 40, respectively. The cross sections of the first flange 41, the protrusion 40 and the second flange 42 are similar to a shape like a Chinese character 'ji', and the first flange 41 and the second flange 42 can be welded on the floor 1, so that the protrusion 40 and the floor 1 form a force transmission chamber. The first flange 41, the protrusion 40 and the second flange 42 may be stamped and formed in an integrated manner.

One end of the projection 40 may be provided to be connected to the sill stringer 2 and the other end to be connected to the floor stringer 3. One end of the projection 40 can be directly abutted against the sill rail 2 and fixed by welding. One end of the projection 40 can also extend to the end face of the sill rail 2, i.e. form a lap joint, and then be fixed by welding.

In some exemplary embodiments, as shown in fig. 3 and 4, a third flange 43 may also be disposed between the first flange 41 and the second flange 42, the third flange 43 is used for welding with the sill rail 2, and the third flange 43 is fixed with the protrusion 40. The protrusion 40, the first flange 41, the second flange 42, and the third flange 43 may be integrally formed. Through the design structure of optimizing connecting piece 4, when simplifying the manufacturing degree of difficulty, also improved the side impact performance of whole car.

In some exemplary embodiments, as shown in fig. 2 and 3, the protrusion 40 near one end of the floor longitudinal beam 3 may be inserted into the floor longitudinal beam 3, or the end of the floor longitudinal beam 3 near the protrusion 40 may be inserted into the protrusion 40, that is, the two are in a form of a plug-in fit, which plays a role in limiting the installation to some extent and improves the installation efficiency. The protrusion 40 may be provided with a mounting hole 40b at an insertion region thereof, and the protrusion may be fixedly coupled to the mounting hole by a screw coupling. The form of grafting combination spiro union provides comprehensive spacing for erection joint spare 4 on the one hand, and on the other hand adopts the spiro union mode fixed, can improve the commonality of connecting piece 4 and floor longeron 3. Aiming at battery packs with different vehicle widths or different types, the floor longitudinal beam 3 can be used, the shape or the local size of the connecting piece 4 is adaptively changed by adjusting the relative connecting position of the floor longitudinal beam 3 and the floor 1, so that the requirement on the side impact performance is met, and the development investment and the cost of the whole vehicle are integrally reduced.

In some exemplary embodiments, as shown in fig. 1 to 7, the connecting member 4 may be provided in an L shape, a circular arc shape, or the like, to adapt to different boundary conditions. The projection 40 may be formed in an L-shape, a circular arc shape, or the like. As shown in fig. 2, the connecting member 4 is disposed obliquely, and the protrusion 40 extends along the length direction of the connecting member 4, so that one end of the connecting member 4 connected to the threshold longitudinal beam 2 is located at the rear side of one end of the connecting member 4 connected to the floor longitudinal beam 2, one end of the protrusion 40 close to the threshold longitudinal beam 2 is located at the rear side of the other end of the protrusion 40 close to the floor longitudinal beam 3, that is, the included angle at the joint of the connecting member 4 and the floor longitudinal beam 3 is an obtuse angle, so as to improve the structural strength of the vehicle body floor assembly and improve the transmission effect of the side impact force.

In some exemplary embodiments, the connecting members 4 may also be provided on the front side of the floor side member 3, i.e., on the side close to the front wall of the vehicle body, i.e., the connecting members 4 may be provided on both ends of the floor side member 3 along the length (X direction) of the vehicle body. As shown in fig. 1, the connecting member 4, the floor side member 3, and the other connecting member 4 (not shown) are formed in a recessed groove shape in a bottom view, and the opening area of the recessed groove is connected by the sill side member 2 to form a closed area having a predetermined area as a whole. When the side collision happens, the closed area forms a stressed deformation crumple zone to crumple the side collision force as fast as possible, so that the living space of drivers and passengers is prevented from being invaded, and the battery pack is prevented from being extruded.

In some exemplary embodiments, as shown in fig. 3, 4 and 7, the protrusion 40 of the connecting member 4 is configured to have a non-uniform cross-sectional shape, and one end of the protrusion close to the floor side member 2 is higher than one end of the protrusion close to the sill side member 2 to form an escape passage 44. The depth of the projections 40 is different for the individual connectors 4. After the connecting members 4 are assembled to the floor panel 1, the height at which the connecting members 4 protrude from the floor panel 1 is different. The avoidance channel 44 is used for avoiding an exhaust pipe of a hybrid vehicle type, so that the problems of heat damage and the like are avoided, and the thermal performance of the whole vehicle is improved. The local structure of the bulge 40 is adaptively adjusted to adapt to different requirements of different vehicle types on boundaries, so that the modularization and the universality are improved, and the vehicle type development cost is reduced.

In some exemplary embodiments, as shown in fig. 3, a reinforcing rib 40a may be provided on the projection 40. The ribs 40a may be provided in the form of elongate grooves as shown, extending along the length of the projection 40. Through setting up strengthening rib 40a, can improve the rigidity of connecting piece 4, intensity, promote the wholeness ability of structure.

In another embodiment of the present invention, a vehicle body floor assembly is also provided. The vehicle body floor assembly comprises a floor 1, a threshold longitudinal beam 2, a floor longitudinal beam 3 and a connecting piece 4 in any one of the embodiments. The connecting element 4 is welded to the floor panel 1. Since the vehicle body floor assembly comprises the connecting piece 4 of any one of the above embodiments, the beneficial effects of any one of the above embodiments are achieved, and the details are not repeated herein.

In some exemplary embodiments, the vehicle body floor assembly includes two sill rails 2, two floor rails 3, and two connecting members 4. The two threshold longitudinal beams 2 are respectively arranged at two ends of the floor 1 along the width of the vehicle body, and the two floor longitudinal beams 3 are arranged between the two threshold longitudinal beams 2. On the floor 1, one group of threshold longitudinal beams 2, floor longitudinal beams 3 and connecting pieces 4 are positioned on one side of the floor 1, and the other group of threshold longitudinal beams 2, floor longitudinal beams 3 and connecting pieces 4 are positioned on the other side of the floor 1 along the width. One connecting piece 4 connects one of the sill longitudinal beams 2 to one of the floor longitudinal beams 3, and the other connecting piece 4 connects the other sill longitudinal beam 2 to the other floor longitudinal beam 3. Through setting up two connecting pieces 4, arrange respectively in the both ends of automobile body width to improve the anti ability of colliding of automobile body floor assembly left and right side.

In some exemplary embodiments, as shown in fig. 1 and 2, the sill member 2 is of a split-mount type structure. The sill member 2 includes a front side member 21, a rear side member 22, and a side member reinforcing plate 23 which are formed separately, so that the structure of each part is simplified and the difficulty in manufacturing the part is reduced. The rear end of the front side member 21 and the front end of the rear side member 22 are welded together. The side member reinforcing plate 23 is welded to the splice of the front side member 21 and the rear side member 22, and the side member reinforcing plate 23 is fixed to each of the front side member 21, the rear side member 22, and the floor panel 1. By adjusting the overlapping length (the size along the front-back direction) of the longitudinal beam reinforcing plate 23 and the front longitudinal beam 21 or the rear longitudinal beam 22, the vehicle body floor assembly is suitable for vehicles with different wheelbases, and the modularization and the universality of the vehicle body floor assembly are improved.

The side member reinforcing plate 23 may be provided to include an upward projection and flanges around the periphery of the projection, each flange being used for welding with the front side member 21, the rear side member 22, and the floor panel 1, respectively. As shown in fig. 1, the side member reinforcing plate 23 may also be configured to follow the splicing region of the front side member 21 and the rear side member 22, so as to increase the mating contact area and improve the overall structural strength. Wherein the projection 40 in the connecting piece 4 or the third flange 43 in the connecting piece 4 is welded with the longitudinal beam reinforcing plate 23 to form a complete force transmission path.

In some exemplary embodiments, as shown in fig. 2, a lifting hole 23a is provided on the side member reinforcing plate 23 for lifting the body-in-white on a production line for assembling interior and exterior trim members or chassis members and the like. In the figure, two hoisting holes 23a are arranged on one side as an example, and the specific positions of the hoisting holes 23a on the threshold longitudinal beam 2 can be adaptively adjusted according to different body-in-white designs.

In some exemplary embodiments, the vehicle body floor assembly further includes a center tunnel (not shown). The center tunnel is generally provided in the middle of the floor 1 in the width direction, dividing the floor 1 into a passenger seat installation area and a driver seat installation area. The middle channel comprises a downward bulge (namely, a bulge towards the interior of the cab) and flanges positioned at two sides of the bulge, namely, the cross section of the middle channel is approximately shaped like a Chinese character 'ji'.

The floor 1 comprises a centre channel reinforcement plate 11, wherein the centre channel reinforcement plate 11 is located at the rear side of the connecting element 4. The middle channel reinforcing plate 11 is positioned between the threshold longitudinal beam 2 and the middle channel, one end of the middle channel reinforcing plate can be connected with the threshold longitudinal beam 2, the other end of the middle channel reinforcing plate can be connected with the middle channel, and the welding mode can be selected. It follows that the arrangement of the centre channel reinforcement 11 does not disrupt the force transmission path formed by the floor stringer 3, the connecting element 4 and the sill stringer 2.

As shown in fig. 2, the connecting member 4 is connected to the center tunnel reinforcing plate 11, and the second flange 42 of the connecting member 4 is welded to the center tunnel reinforcing plate 11 to increase the transmission path of the side impact, i.e., one is composed of the sill member 2, the connecting member 4 and the floor member 3, and the other is composed of the sill member 2, the center tunnel reinforcing plate 11 and the center tunnel. When side collision occurs, a part of side collision force is transmitted to the middle channel through the middle channel reinforcing plate 11, the deformation of the seat crossbeam is kept reasonable, the extrusion of the seat crossbeam to the middle channel is reduced, and the protection safety of the battery pack and the living space of passengers can be effectively protected. The middle channel reinforcing plate 11 may be formed by stamping a single sheet metal part, or by welding a plurality of stamping parts. Through setting up connecting piece 4, can be appropriate reduce the extrusion of seat centering passageway along automobile body rear portion transmission to collision energy, reduce the intensity demand of passageway, and then reach fine heavy effect that subtracts, more can increase the storing space in the car, promote market competition.

In some exemplary embodiments, as shown in fig. 2, a mounting point 31 for fixing a battery pack is provided on the floor stringer 3. The mounting point 31 may be one or plural. The figure only shows a partial area of the floor 1, two floor longitudinal beams 3 are usually arranged side by side in the whole width of the vehicle body and are respectively positioned at the left side and the right side of the middle channel, and the two floor longitudinal beams 3 form a plurality of mounting points 31 for fixing a battery pack, generally more than three mounting points, so as to provide stable support for the battery pack. Here, the mounting point 31 is not limited to the through hole, but also includes a solder nut provided on the back of the through hole.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims (10)

1. A connecting piece is characterized by comprising a bulge, wherein one end of the connecting piece is arranged to be connected with a threshold longitudinal beam, and the other end of the connecting piece is arranged to be connected with a floor longitudinal beam;

wherein the bulge is used for forming a transmission chamber for transmitting force with the floor stringer and the floor.

2. The connector of claim 1, further comprising a first flange and a second flange; the first flanging and the second flanging are respectively fixed to two opposite sides of the protrusion;

the first flanging, the bulge and the second flanging form a shape like a Chinese character 'ji', the first flanging is used for being welded with the floor, and the second flanging is used for being welded with the floor.

3. The connector of claim 2, further comprising a third flange secured to the projection, the third flange being positioned between the first and second flanges and adapted to be welded to the sill rail.

4. A connector according to claim 1, wherein the other end of the connector is arranged for bayonet fitting with the floor stringer and is provided with mounting holes for securing with the floor stringer.

5. A connecting member according to claim 1, wherein said connecting member is disposed at an angle, and one end of said connecting member near said sill rail is located at a rear side of said connecting member near the other end of said floor rail.

6. A coupling according to claim 5, wherein the projection extends along the length of the coupling and is arcuate.

7. A connecting member according to any one of claims 1 to 6, wherein the other end of the connecting member adjacent the floor stringer is higher than the end of the connecting member adjacent the sill stringer to form an escape passage.

8. A coupling according to any one of claims 1 to 6, wherein the projections are provided with ribs which are channel-shaped and extend along the length of the projections.

9. A vehicle body floor assembly comprising said floor panel, said sill rail, said floor rail and said connector of any of claims 1 to 8 welded to said floor panel.

10. The vehicle body floor assembly of claim 9, including two said sill rails, two said floor rails, and two said connectors; the two threshold longitudinal beams are respectively arranged at two ends of the floor along the width of the vehicle body, and the two floor longitudinal beams are arranged between the two threshold longitudinal beams;

one of the connecting members connects one of the sill stringers and one of the floor stringers, and the other connecting member connects the other sill stringer and the other floor stringer.

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