CN115923935B - Lower car body structure and car - Google Patents
Lower car body structure and car Download PDFInfo
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- CN115923935B CN115923935B CN202310034598.5A CN202310034598A CN115923935B CN 115923935 B CN115923935 B CN 115923935B CN 202310034598 A CN202310034598 A CN 202310034598A CN 115923935 B CN115923935 B CN 115923935B
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- 230000005540 biological transmission Effects 0.000 claims abstract description 38
- 238000001125 extrusion Methods 0.000 claims abstract description 29
- 230000002787 reinforcement Effects 0.000 claims description 50
- 238000010521 absorption reaction Methods 0.000 claims description 33
- 230000003014 reinforcing effect Effects 0.000 claims description 21
- 238000005192 partition Methods 0.000 claims description 19
- 230000008093 supporting effect Effects 0.000 claims description 14
- 238000012546 transfer Methods 0.000 claims description 14
- 230000006698 induction Effects 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 4
- 239000011148 porous material Substances 0.000 claims description 4
- 230000004308 accommodation Effects 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 8
- 230000008859 change Effects 0.000 abstract description 3
- 230000001976 improved effect Effects 0.000 description 14
- 238000003466 welding Methods 0.000 description 8
- 125000006850 spacer group Chemical group 0.000 description 7
- 239000000853 adhesive Substances 0.000 description 4
- 230000001070 adhesive effect Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000004880 explosion Methods 0.000 description 4
- 238000002198 surface plasmon resonance spectroscopy Methods 0.000 description 4
- 239000012790 adhesive layer Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000001962 electrophoresis Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000003351 stiffener Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Body Structure For Vehicles (AREA)
Abstract
The invention provides a lower vehicle body structure and an automobile, which comprise two threshold beams, a front floor and a beam assembly which are oppositely arranged; the two side edges of the front floor are respectively connected with the two threshold beams; the beam assembly is arranged on the front floor and comprises at least two vehicle body beams, and two ends of each vehicle body beam are respectively connected with two threshold beams; and a total force transmission path is formed between the two threshold beams and at least two vehicle body cross beams. A total force transmission path is formed between the two threshold beams and at least two vehicle body cross beams, collision force can be well decomposed and transmitted, extrusion force to a lower vehicle body structure is weakened, deformation of the lower vehicle body structure is reduced, and zero extrusion of the battery cell is guaranteed. By reasonably planning a force transmission path and matching rigidity, on the premise of no change of the vehicle width required by the platformization, the weight is reduced in a mode of combining various materials and various connection modes, and the intrusion of the lower vehicle body structure after collision is obviously reduced and the battery cell is extruded zero.
Description
Technical Field
The invention belongs to the technical field of lower automobile bodies of automobiles, and particularly relates to a lower automobile body structure and an automobile.
Background
The side column collision of the new energy automobile is the working condition newly proposed by the 2021C-NCAP rule, and the 2025 rule is intended to provide similar collision performance requirements for the fuel tank of the fuel automobile. At present, the working condition development mainly refers to American standard (NHTSA-NCAP) and European standard (U-NCAP), and small deformation of a vehicle body and a battery pack is difficult to ensure. After the collision test of the past project, the car body is seriously deformed, the upper side beam and the threshold invade greatly, the damage of a dummy is not reduced, and the battery pack is extruded and has explosion fire risk.
Because the new energy vehicle battery pack is various in types (lithium iron phosphate, ternary lithium, charging, electricity changing and different suppliers), battery packs with different configurations are difficult to share the same lower vehicle body structure, and the experimental instability and the internal mechanism research aiming at the explosion and the ignition of the battery are not accurate enough, so that once the battery core is extruded and deformed, the conclusion of whether the explosion and the ignition cannot be quantitatively given. Therefore, how to realize the platform sharing of the lower vehicle body structure and the zero extrusion of the battery cell after collision under the cost of limited energy absorption space and limited weight increment, and high requirements are put on the design of the lower vehicle body structure.
Disclosure of Invention
The invention provides a lower vehicle body structure and an automobile, which are used for solving the problems that the existing lower vehicle body structure is severely deformed due to extrusion, so that a battery pack core is deformed with high probability, and the explosion and fire hidden danger of the battery pack are generated.
A lower car body structure comprises two threshold beams, a front floor and a beam assembly which are oppositely arranged; the two side edges of the front floor are respectively connected with the two threshold beams; the beam assembly is arranged on the front floor and comprises at least two vehicle body beams, and two ends of each vehicle body beam are respectively connected with two threshold beams; and a collision energy absorption structure is arranged in the threshold beam, and a total force transmission path is formed between the two threshold beams and at least two vehicle body cross beams.
Preferably, the at least two vehicle body cross beams comprise a front floor cross beam, a front seat front cross beam, a front seat rear cross beam and a rear seat cross beam which are sequentially arranged from front to back; a first force transmission path is formed between the threshold beam and the front floor beam; a second force transmission path is formed between the threshold beam and the front seat front cross beam; a third force transmission path is formed between the threshold beam and the rear cross beam of the front seat; a fourth force transmission path is formed between the threshold beam and the rear seat cross beam; the first, second, third and fourth force transfer paths form the total force transfer path.
Preferably, the lower body structure further comprises a first strap and a second strap; the first lap joint is assembled on one end of the front seat front cross beam, which is close to the threshold beam, and is connected with the threshold beam, and a second force transmission path is formed among the threshold beam, the front seat front cross beam and the first lap joint; the second lap joint is assembled on one end of the front seat rear cross beam, which is close to the threshold beam, and is connected with the threshold beam, and a third force transmission path is formed among the threshold beam, the front seat rear cross beam and the second lap joint.
Preferably, the lower vehicle body structure further includes a middle tunnel installed on the front floor in a longitudinal direction, the middle tunnel penetrating through the front floor cross member, the front seat front cross member, and the front seat rear cross member in order.
Preferably, the threshold beam comprises a threshold beam lower structure and a threshold beam upper structure extending upwards from the threshold beam lower structure, wherein the collision energy absorbing structure is arranged in the threshold beam upper structure; the inner side edge of the upper structure of the threshold beam extends to form a supporting plate along the horizontal direction; the front floor is lapped on the supporting plate, and two side edges of the front floor are respectively connected with the upper structures of the two threshold beams; two ends of the vehicle body cross beam are respectively connected with the upper structures of the two threshold beams; and a battery accommodating space is formed between the two threshold beam lower structures, and the threshold beam lower structures are connected with a battery pack assembled in the battery accommodating space.
Preferably, the impact energy absorbing structure comprises at least one first energy absorbing panel and/or at least one second energy absorbing panel; the first energy absorbing plate is arranged along the horizontal direction and is connected with the left side wall and the right side wall of the upper structure of the threshold beam; the second energy absorbing plate is arranged along the vertical direction and is connected with the upper side wall and the lower side wall of the upper structure of the threshold beam; at least one first energy absorption plate and/or at least one second energy absorption plate are matched to form at least two collision energy absorption cavities.
Preferably, the crash energy absorbing structure further comprises an energy absorbing reinforcement disposed within the crash energy absorbing cavity.
Preferably, the energy absorbing reinforcement comprises a second reinforcement comprising a first tubular body and at least one second spacer disposed within the first tubular body, at least one of the second spacers cooperating with the first tubular body to form at least two second extruded energy absorbing cavities; and a collision induction structure which is formed between the middle position and one edge position of the second reinforcement and is in arc shape and is reduced from outside to inside.
Preferably, the energy absorbing reinforcement comprises a first reinforcement comprising a middle plate, two oppositely disposed L-shaped fixing plates and at least one first spacer plate; the two side edges of the middle plate are respectively connected with the two L-shaped fixing plates to form a first reinforcing cavity; at least one first partition plate is arranged in the first reinforcing cavity and separates the first reinforcing cavity to form at least two first extrusion energy absorption cavities.
Preferably, the sill beam lower structure includes a lower connection plate, an outer connection plate and an inner connection plate extending in a vertical direction from both side edges of the lower connection plate, the outer connection plate and the inner connection plate being connected to the sill beam upper structure; the lower connecting plate is connected with a battery pack assembled in the battery accommodating space.
Preferably, the battery accommodation space is a space below a region formed between inner side edges of the two rocker upper structures; the inner connection plate is connected to the middle region of the upper structure of the threshold beam such that a harness installation space for installing a harness is formed between the inner connection plate and the battery pack assembled in the battery receiving space; the inner connecting plate is provided with a through groove for accommodating the wire harness during collision extrusion.
Preferably, the front floor beam comprises an upper beam piece and a lower beam piece, wherein the upper beam piece is lapped on the lower beam piece to form a beam reinforcement cavity; and a reinforcing beam is arranged in the beam reinforcing cavity.
Preferably, the front seat front cross beam comprises a cross beam connecting plate arranged along the vertical direction, a first U-shaped connecting plate extending from one edge of the cross beam connecting plate, and a second U-shaped connecting plate extending from the other edge of the cross beam connecting plate; the tail end of the first U-shaped connecting plate is connected with the beam connecting plate, and the tail end of the second U-shaped connecting plate is connected with the beam connecting plate, so that the cross section of the front beam of the front seat is S-shaped.
Preferably, the front seat rear cross beam comprises a cross beam tubular body, a cross beam cavity is formed in the cross beam tubular body, and a concave structure is formed below the cross beam tubular body; the front seat rear cross beam further comprises a third partition plate arranged in the cross beam tubular body, and the third partition plate is used for separating the cross beam cavities to form at least two cross beam supporting cavities.
Preferably, the beam tubular body includes a first connection portion, a second connection portion, a first arch portion formed by extending upward from a middle position of the first connection portion and a middle position of the second connection portion, and a second arch portion formed by extending upward from an inner side edge of the first connection portion and an inner side edge of the second connection portion, a gap is formed between the second arch portion and the first arch portion, and the second arch portion is of the concave structure.
Preferably, the rear seat cross beam comprises an upper U-shaped plate and a lower U-shaped plate which are oppositely arranged in the opening direction, and the lower U-shaped plate is embedded into the upper U-shaped plate; the upper U-shaped plate is provided with a first transverse rib and a first vertical rib, the first transverse rib is arranged at two side positions of the upper U-shaped plate, and the first vertical rib is arranged at the middle position of the upper U-shaped plate; the lower U-shaped plate is provided with second vertical ribs, and the second vertical ribs are arranged at two sides of the lower U-shaped plate.
Preferably, the threshold beam is provided with at least one first opening, and the first opening is arranged along the longitudinal direction; the front seat front cross beam, the front seat rear cross beam and the rear seat cross beam are respectively provided with a second open pore, and the second open pores are arranged along the transverse direction; the inside of threshold roof beam, preceding seat front cross beam, preceding seat rear cross beam and back seat cross beam all is filled with the reinforcement piece, the reinforcement piece covers on the first trompil and/or the second trompil.
An automobile comprising a frame and a lower body structure; the lower body structure is mounted on the frame.
In the lower vehicle body structure, two side edges of the front floor are respectively connected with two threshold beams and are connected with structural adhesive by adopting SPR (surface plasmon resonance); the beam assembly is arranged on the front floor and is connected by spot welding, the beam assembly comprises at least two vehicle body beams, two ends of each vehicle body beam are respectively connected with two threshold beams, and FDS (fully drawn yarn) is adopted for connection, so that the connection between all parts of a lower vehicle body structure is firmer, the anti-collision capability of equipment is improved, and the battery pack core is prevented from being extruded; meanwhile, a total force transmission path is formed between the two threshold beams and at least two vehicle body cross beams, collision force can be well decomposed and transmitted, extrusion force to a lower vehicle body structure is weakened, deformation of the lower vehicle body structure is reduced, zero extrusion of a battery cell is guaranteed, and safety of a battery pack is improved. By reasonably planning a force transmission path and matching rigidity, on the premise of no change of the vehicle width required by the platformization, the weight is reduced in a mode of combining various materials and various connection modes, and the intrusion of the lower vehicle body structure after collision is obviously reduced and the battery cell is extruded zero.
Drawings
FIG. 1 is an isometric view of a lower body structure of the present invention;
FIG. 2 is a bottom view of FIG. 1;
FIG. 3 is a cross-sectional view of FIG. 1;
FIG. 4 is a cross-sectional view of a rocker beam of the present invention;
FIG. 5 is an isometric view of a second reinforcement member of the present invention;
FIG. 6 is a cross-sectional view of a second reinforcement member of the present invention;
FIG. 7 is an isometric view of a first reinforcement member of the present invention;
FIG. 8 is an isometric view of a front floor cross member of the present invention;
FIG. 9 is a cross-sectional view of FIG. 8;
FIG. 10 is an isometric view of a front seat front cross member of the present invention;
FIG. 11 is an isometric view of a front seat rear cross member of the present invention;
FIG. 12 is a cross-sectional view of FIG. 10;
FIG. 13 is an isometric view of a rear seat cross member of the present invention;
Fig. 14 is a front view of a rear seat cross member of the present invention.
1, A threshold beam; 11. a sill beam lower structure; 111. a lower connecting plate; 112. an outer connecting plate; 113. an inner connection plate; 12. a threshold beam upper structure; 13. a support plate; 2. a front floor; 3. a vehicle body cross member; 31. a front floor cross member; 311. an upper cross member; 312. a lower cross member; 313. a beam reinforcement cavity; 314. a stiffening beam; 32. a front seat front cross member; 321. a beam connecting plate; 322. the first U-shaped connecting plate; 323. the second U-shaped connecting plate; 33. a front seat rear cross member; 331. a cross beam tubular body; 332. a beam cavity; 333. a recessed structure; 334. a third separator; 335. a beam support cavity; 34. a rear seat cross member; 341. the U-shaped plate is arranged; 342. a lower U-shaped plate; 343. a first transverse rib; 344. the first vertical ribs; 345. the second vertical ribs; 4. a first strap; 5. a second strap; 6. a middle channel; 7. a collision energy absorbing structure; 72. a first energy absorbing plate; 71. a second energy absorbing plate; 8. an energy absorbing stiffener; 81. a second reinforcement; 811. a first tubular body; 812. a second separator; 813. a second extrusion energy absorption cavity; 814. a collision-inducing structure; 82. a first reinforcement; 821. an intermediate plate; 822. an L-shaped fixing plate; 823. a first separator; 824. a first reinforcement cavity; 825. a first extrusion energy absorption cavity; 9. a first opening; 10. and a second opening.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects solved by the invention more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In the description of the present invention, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships that are based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
An embodiment of the present invention provides a lower body structure including two threshold beams 1, a front floor 2, and a cross beam assembly that are disposed opposite to each other, referring to fig. 1; two side edges of the front floor 2 are respectively connected with two threshold beams 1; the beam assembly is arranged on the front floor 2 and comprises at least two vehicle body beams 3, and two ends of each vehicle body beam 3 are respectively connected with two threshold beams 1; the door sill beams 1 are internally provided with collision energy absorbing structures 7, and a total force transmission path is formed between the two door sill beams 1 and at least two vehicle body cross beams 3.
As an example, two threshold beams 1, a front floor 2 and a cross beam assembly disposed opposite to each other together constitute a side pillar impact protection structure for protecting a battery pack or other components.
In this example, two sides of the front floor 2 are respectively connected with two threshold beams 1, and are connected by adopting SPR and structural adhesive. The beam assembly is mounted on the front floor 2, and can be welded on the front floor 2 by spot welding. The crossbeam assembly includes two at least automobile body crossbeams 3, and the both ends of every automobile body crossbeam 3 link to each other with two threshold roof beams 1 respectively, adopts the FDS to connect, sets up like this and makes the connection between each part of lower body structure more firm, improves equipment anticollision ability, avoids the battery package electric core to receive the extrusion. The collision energy absorbing structure 7 is arranged in the threshold beam 1, so that the collision force born by the threshold beam 1 can be resisted and absorbed, meanwhile, a total force transmission path is formed between the two threshold beams 1 and at least two vehicle body cross beams 3, the collision force can be well decomposed and transmitted, the extrusion force to the lower vehicle body structure is weakened, and the deformation of the lower vehicle body structure is reduced. In the example, the weight can be reduced in a mode of combining multiple materials and multiple connection modes on the premise of ensuring that the vehicle width is unchanged in the platform type requirement by reasonably planning a force transmission path and matching rigidity, so that the intrusion quantity of the lower vehicle body structure after collision is obviously reduced. When the lower vehicle body structure is suitable for a new energy automobile, the battery pack is assembled below the lower vehicle body structure, and when a lateral collision of the vehicle occurs, the lower vehicle body structure can absorb and decompose the received collision force, so that deformation is reduced, zero extrusion of the battery core is guaranteed, and the safety of the battery pack is improved.
In one embodiment, referring to fig. 1, at least two vehicle body cross members 3 include a front floor cross member 31, a front seat front cross member 32, a front seat rear cross member 33, and a rear seat cross member 34, which are disposed in order from front to rear; a first force transmission path is formed between the threshold beam 1 and the front floor cross beam 31; a second force transmission path is formed between the threshold beam 1 and the front seat front cross beam 32; a third force transmission path is formed between the threshold beam 1 and the front seat rear cross beam 33; a fourth force transmission path is formed between the threshold beam 1 and the rear seat cross beam 34; the first force transfer path, the second force transfer path, the third force transfer path and the fourth force transfer path form a total force transfer path.
In this example, it is described that at least two vehicle body cross members 3 include a front floor cross member 31, a front seat front cross member 32, a front seat rear cross member 33, and a rear seat cross member 34, and the rocker beam 1 and the front floor cross member 31 are connected by FDS, and a first force transmission path is formed therebetween; the threshold beam 1 is detachably connected with the front seat front cross beam 32, and a second force transmission path is formed between the threshold beam 1 and the front seat front cross beam 32; the threshold beam 1 is detachably connected with the rear cross beam 33 of the front seat, and a third force transmission path is formed between the threshold beam 1 and the rear cross beam; the threshold beam 1 and the rear seat cross beam 34 are connected by FDS, and a fourth force transmission path is formed between the threshold beam 1 and the rear seat cross beam; the first force transfer path, the second force transfer path, the third force transfer path and the fourth force transfer path form a total force transfer path.
Under the side column collision working condition, the collision force direction received by the vehicle is the left and right directions, in order to reduce the extrusion of a battery pack when the side column collides the working condition, after the threshold beam 1 receives the side collision force, the collision energy absorption structure 7 in the threshold beam 1 is firstly utilized for collision energy absorption, and the total force is decomposed through four force transmission paths formed by the front floor beam 31, the front seat front beam 32, the front seat rear beam 33 and the rear seat beam 34, so that the extrusion force to the lower vehicle body structure can be weakened, and the deformation of the lower vehicle body structure is reduced.
In one embodiment, referring to FIG. 1, the lower body structure further includes a first landing member 4 and a second landing member 5; the first lap joint 4 is assembled on one end of the front seat front cross beam 32 close to the threshold beam 1 and is connected with the threshold beam 1, and a second force transmission path is formed among the threshold beam 1, the front seat front cross beam 32 and the first lap joint 4; the second bridge 5 is fitted to an end of the front seat rear cross member 33 adjacent to the rocker beam 1 and is connected to the rocker beam 1, and a third force transmission path is formed between the rocker beam 1, the front seat rear cross member 33 and the second bridge 5.
The first and second straps 4, 5 are elements for achieving the overlapping of the body cross member 3 and the rocker 1.
As an example, the shape of the first lap joint 4 is matched with the shape of the front seat front cross beam 32, the first lap joint 4 can be assembled on one end of the front seat front cross beam 32 close to the threshold beam 1, the first lap joint 4 and the front seat front cross beam 32 are fixed by adopting a bolt or welding mode, the first lap joint 4 and the threshold beam 1 are fixed by adopting a bolt or welding mode, a second force transmission path is formed among the threshold beam 1, the front seat front cross beam 32 and the first lap joint 4, so that the collision force of the collision energy absorbing structure 7 in the threshold beam 1 after collision energy absorption is decomposed and transmitted through the front seat front cross beam 32, the extrusion force on the lower vehicle body structure is weakened, and the deformation of the lower vehicle body structure is reduced.
As an example, the shape of the second lap joint 5 is matched with the shape of the front seat rear cross member 33, the second lap joint 5 can be assembled on one end of the front seat rear cross member 33 close to the threshold beam 1, the second lap joint 5 and the front seat rear cross member 33 are fixed by adopting a bolt or welding mode, the second lap joint 5 and the threshold beam 1 are fixed by adopting a bolt or welding mode, a third force transmission path is formed among the threshold beam 1, the front seat rear cross member 33 and the second lap joint 5, so that the collision force of the collision energy absorbing structure 7 in the threshold beam 1 after collision energy absorption is decomposed and transmitted through the front seat rear cross member 33, the extrusion force on the lower vehicle body structure is weakened, and the deformation of the lower vehicle body structure is reduced.
In one embodiment, referring to fig. 1, the lower vehicle body structure further includes a middle tunnel 6 mounted on the front floor 2 in the longitudinal direction, the middle tunnel 6 penetrating the front floor cross member 31, the front seat front cross member 32, and the front seat rear cross member 33 in this order.
In this example, the middle channel 6 sequentially penetrates the front floor cross member 31, the front seat front cross member 32 and the front seat rear cross member 33, and the fixed connection points of the front floor cross member 31, the front seat front cross member 32 and the front seat rear cross member 33 are increased, so that the supporting strength of the lower vehicle body structure can be enhanced, the collision deformation resistance of the lower vehicle body structure is enhanced, and the protection of the battery pack and other parts is improved.
In one embodiment, referring to fig. 3, the rocker 1 comprises a rocker lower structure 11 and a rocker upper structure 12 extending upwardly from the rocker lower structure 11, the rocker upper structure 12 having a collision energy absorbing structure 7 disposed therein; the inner edge of the upper sill beam structure 12 is extended in the horizontal direction by a support plate 13; the front floor 2 is lapped on the supporting plate 13, and two side edges of the front floor 2 are respectively connected with the upper structures 12 of the two threshold beams; two ends of the vehicle body cross beam 3 are respectively connected with the upper structures 12 of the two threshold beams; a battery accommodating space is formed between the two threshold beam lower structures 11, and the threshold beam lower structures 11 are connected with a battery pack assembled in the battery accommodating space.
In this example, the threshold beam 1 is described as including a threshold beam lower structure 11 and a threshold beam upper structure 12, where the inner edge of the threshold beam upper structure 12 extends in the horizontal direction to form a support plate 13, the support plate 13 is integrally formed with the threshold beam upper structure 12, and the support plate 13 is connected with the front floor 2 to form a support area, so that the contact surface between the threshold beam 1 and the front floor 2 can be increased, and the connection between the two is more firm. A battery accommodating space is formed between the two threshold beam lower structures 11, and the threshold beam lower structures 11 are connected with a battery pack assembled in the battery accommodating space, so that when a vehicle is collided, the supporting area can provide supporting protection for the battery pack or other parts, and the battery pack or other parts are prevented from being extruded.
In one embodiment, referring to FIG. 4, the impact energy absorbing structure 7 includes at least one first energy absorbing plate 72 and/or at least one second energy absorbing plate 71; the first energy absorbing plate 72 is disposed in a horizontal direction, and the first energy absorbing plate 72 is connected to the left and right side walls of the sill beam upper structure 12; the second energy absorbing plate 71 is arranged along the vertical direction, and the second energy absorbing plate 71 is connected with the upper side wall and the lower side wall of the threshold beam upper structure 12; at least one first energy absorbing plate 72 and/or at least one second energy absorbing plate 71 cooperate to form at least two crash energy absorbing chambers.
In this example, the impact absorbing structure 7 comprises at least one first energy absorbing plate 72 and/or at least one second energy absorbing plate 71, which cooperate to form at least two impact absorbing cavities, which are resistant to impact forces to which the absorber rocker beam 1 is subjected. The first energy absorbing plates 72 are disposed in a horizontal direction, and when the number of the first energy absorbing plates 72 is one, the thickness of the single first energy absorbing plate 72 is gradually thickened from outside to inside. When there are at least two first energy absorbing plates 72, the thickness of each first energy absorbing plate 72 is gradually increased from outside to inside, and the thickness of each first energy absorbing plate 72 may be the same or gradually increased from outside to inside. The second energy absorbing plates 71 are arranged in the vertical direction, and the thickness of each second energy absorbing plate 71 is gradually thickened from outside to inside. The arrangement can achieve the weight reduction effect, and the collision energy absorption cavity is utilized to absorb energy to resist collision force, so that the safety of the battery pack is improved, and the use safety of equipment is improved only by reasonably arranging the energy absorption area and the supporting area to stop collision extrusion deformation in the threshold beam 1 on the premise that the width of the lower vehicle body structure is unchanged.
In one embodiment, referring to FIG. 4, the impact energy absorbing structure 7 further includes an energy absorbing reinforcement 8 disposed within the impact energy absorbing cavity.
In this example, the collision energy absorbing cavity of the collision energy absorbing structure 7 is filled with the energy absorbing reinforcement member 8, and the energy absorbing reinforcement member 8 can absorb energy to resist collision force, so that the protection capability on the threshold beam 1 is further improved, and the safety of the battery pack is improved. For example, an energy absorbing reinforcement 8 may be provided in the innermost crash energy absorbing cavity.
Under the condition of limited vehicle body width, the threshold beam 1 is designed into a 7-shaped multi-cavity cross section, and the energy absorption reinforcing piece 8 is selectively filled in the collision energy absorption cavity, so that the performance requirements of different configurations and weight vehicle types are met, and the collision extrusion deformation is stopped in the threshold beam 1 as much as possible.
In one embodiment, referring to FIGS. 5 and 6, the energy absorbing reinforcement 8 comprises a second reinforcement 81, the second reinforcement 81 comprising a first tubular body 811 and at least one second spacer 812 disposed within the first tubular body 811, the at least one second spacer 812 cooperating with the first tubular body 811 to form at least two second extruded energy absorbing cavities 813; the collision-inducing structure 814 is formed between the middle position and one edge position of the second reinforcement 81 to be curved from the outside to the inside.
In this example, the second reinforcement 81 is described as including a first tubular body 811 and a second partition 812, where at least one second partition 812 is matched with the first tubular body 811 to form at least two second extrusion energy absorbing cavities 813, so that energy absorption can be effectively performed to resist collision, and a collision induction structure 814 is formed between a middle position and an edge position of the second reinforcement 81 and is reduced from outside to inside in an arc shape, and when a side pillar collides, the collision induction structure 814 is reduced from outside to inside in an arc shape, so that the collision pillar can slide backward relative to the whole vehicle, and meanwhile, the whole vehicle rotates around the collision pillar, and by converting translational kinetic energy of the vehicle into rotational kinetic energy, induced overturning after the whole vehicle collides can be realized, thereby reducing invasion of the vehicle body.
In one embodiment, referring to FIG. 7, the energy absorbing reinforcement 8 comprises a first reinforcement 82, the first reinforcement 82 comprising a middle plate 821, two oppositely disposed L-shaped fixed plates 822, and at least one first baffle 823; the two side edges of the middle plate 821 are respectively connected with two L-shaped fixing plates 822 to form a first reinforcing cavity 824; at least one first baffle 823 is disposed within the first reinforcing cavity 824 separating the first reinforcing cavity 824 to form at least two first crush energy-absorbing cavities 825.
In this example, the first reinforcement 82 is described as including an intermediate plate 821, an L-shaped fixing plate 822, and a first partition 823, where two side edges of the intermediate plate 821 are respectively connected to two L-shaped fixing plates 822 to form a first reinforcement cavity 824, so that energy absorption and collision resistance can be effectively performed. The first baffle 823 separates the first reinforcing cavities 824 to form at least two first extrusion energy absorbing cavities 825, so that the energy absorbing and collision resisting effect of the first reinforcing member 82 can be improved, and the deformation of the vehicle body can be reduced. For example, the first baffle 823 includes two edge baffles and at least one intermediate baffle. Edge spacers are provided at both ends of the first reinforcement 82, and outer side walls of the edge spacers are respectively connected to inner side walls of the ends of the intermediate plate 821 and the two L-shaped fixing plates 822. The intermediate partition plate is a partition plate provided in a space formed by the intermediate plate 821, the two L-shaped fixing plates 822, and the two L-shaped partition plates. The intermediate partition may be a horizontal partition arranged in the horizontal direction or a vertical partition arranged in the vertical direction.
As an example, the connection between the first reinforcement 82 and the inner wall of the crash energy absorption chamber by the adhesive layer formed by the adhesive material can improve the connection reliability of the first reinforcement 82. In this example, one side of the adhesive layer is disposed at the middle position of the middle plate 821, and the other side may be disposed on the second energy absorbing plate 71 disposed in the vertical direction, so that the opening direction of the first extrusion energy absorbing cavity 825 formed by the first reinforcement 82 is directed toward the vehicle inside, which helps to secure the impact energy absorbing effect.
In one embodiment, referring to fig. 8, the rocker lower structure 11 includes a lower connection plate 111, an outer connection plate 112 and an inner connection plate 113 extending in a vertical direction from both side edges of the lower connection plate 111, the outer connection plate 112 and the inner connection plate 113 being connected to the rocker upper structure 12; the lower connection plate 111 is connected to a battery pack mounted in the battery receiving space.
In this example, the threshold beam lower structure 11 is described as including the lower connecting plate 111, the outer connecting plate 112, and the inner connecting plate 113, where the lower connecting plate 111, the outer connecting plate 112, and the inner connecting plate 113 form a first space, and the lower connecting plate 111 is connected to the battery pack, and when a collision is received, the first space has a function of absorbing energy to resist the collision, so that a certain protection can be provided to the battery pack. In this example, the lower connection plate 111, the outer connection plate 112 and the inner connection plate 113 form a first space, which may also be used to accommodate cooling pipes or other pipelines to save a pipeline layout space.
In one embodiment, referring to fig. 4, the battery receiving space is a space below an area formed between the inner side edges of the two rocker upper structures 12; the inner connection plate 113 is connected to the middle region of the threshold beam upper structure 12 such that a harness installation space for installing a harness is formed between the inner connection plate 113 and the battery pack assembled in the battery receiving space; the inner connection plate 113 is provided with a through groove for accommodating the wire harness at the time of collision and extrusion.
In this example, through the arrangement of two threshold beam superstructure 12 and interior connecting plate 113, formed battery accommodation space and pencil installation space, be convenient for place battery package and plan pencil, establish logical groove on interior connecting plate 113, when the vehicle received the collision, the pencil can inlay in logical inslot to prevent pencil and battery package and receive the extrusion.
In one embodiment, referring to fig. 8 and 9, the front floor cross member 31 includes an upper cross member 311 and a lower cross member 312, the upper cross member 311 overlapping the lower cross member 312 to form a cross member reinforcement cavity 313; a reinforcing beam 314 is provided in the beam reinforcing cavity 313.
In this example, it is described that the front floor beam 31 includes the upper beam member 311 and the lower beam member 312, the upper beam member 311 and the lower beam member 312 cooperate to form the beam reinforcement cavity 313, the beam reinforcement cavity 313 is filled with the reinforcement beam 314, so that the strength of the front floor beam 31 can be improved, the i-beam effect of the reinforcement beam 314 for improving the deformation resistance of the lower vehicle body structure is best, and the front floor beam 31 is made of mild steel material, so that the weight can be reduced to the greatest extent on the premise of meeting the performance index.
In an embodiment, referring to fig. 10, the front seat front cross member 32 includes a cross member connecting plate 321 disposed in a vertical direction, a first U-shaped connecting plate 322 extending from one edge of the cross member connecting plate 321, and a second U-shaped connecting plate 323 extending from the other edge of the cross member connecting plate 321; the end of the first U-shaped link plate 322 is engaged with the cross beam link plate 321, and the end of the second U-shaped link plate 323 is engaged with the cross beam link plate 321 so that the cross section of the front seat front cross beam 32 is S-shaped.
In this example, the front seat front beam 32 is described as including a beam connecting plate 321, a first U-shaped connecting plate 322 and a second U-shaped connecting plate 323, where the end of the first U-shaped connecting plate 322 is joined to the beam connecting plate 321, and the end of the second U-shaped connecting plate 323 is joined to the beam connecting plate 321, so that the cross section of the front seat front beam 32 is S-shaped, the front seat front beam 32 is a through beam, and the material is rolled steel, so that the weight is reduced to the greatest extent on the premise of meeting the performance index.
In one embodiment, referring to fig. 11 and 12, the front seat rear cross member 33 includes a cross member tubular body 331, a cross member cavity 332 is formed within the cross member tubular body 331, and a recessed structure 333 is formed below the cross member tubular body 331; the front seat rear cross member 33 further includes a third partition 334 disposed within the cross member tubular body 331, the third partition 334 for separating the cross member cavities 332 to form at least two cross member support cavities 335.
In this example, the front seat rear cross member 33 is described as including a cross member tubular body 331 and a third bulkhead 334, a cross member cavity 332 is formed in the cross member tubular body 331,
A recess structure 333 is formed below the cross beam tubular body 331 so as to facilitate routing of the wire harness. Further, the vertical tube wall thickness of the cross beam tubular body 331 is larger than the transverse tube wall of the cross beam tubular body 331, so that not only the supporting strength of the front seat rear cross beam 33 can be enhanced, but also the weight of the front seat rear cross beam 33 can be reduced. The third partition 334 is configured to separate the beam cavity 332 to form at least two beam support cavities 335, which may provide good energy absorption and impact resistance, and reduce structural deformation. In this example, the front seat rear cross member 33 is provided as a through cross member, seven-series extruded aluminum is used as a material, and by designing three cross member support chambers 335, the front seat rear cross member 33 can be made to meet performance indexes while weight reduction is performed as much as possible. The chamfer of the beam cavity 332 is designed into a multi-edge structure, so that the section attribute of the front seat rear beam 33 can be increased, and the structural performance of the front seat rear beam 33 can be improved
In an embodiment, referring to fig. 11 and 12, the beam tubular body 331 includes a first connection portion, a second connection portion, a first arch portion formed by extending upward from a middle position of the first connection portion and a middle position of the second connection portion, and a second arch portion formed by extending upward from an inner edge of the first connection portion and an inner edge of the second connection portion, a gap exists between the second arch portion and the first arch portion, and the second arch portion is a concave structure 333.
In this example, the structure of the cross beam tubular body 331 is described, the cross beam tubular body is fixed on the front floor 2 through the first connecting portion and the second connecting portion, the first arched portion formed by extending upward from the middle position of the first connecting portion and the middle position of the second connecting portion and the second arched portion formed by extending upward from the inner side edge of the first connecting portion and the inner side edge of the second connecting portion are matched to form the cross beam cavity 332, wherein the second arched portion is a concave structure 333, so that the supporting strength of the rear cross beam 33 of the front seat can be enhanced, the weight of the rear cross beam 33 of the front seat can be reduced, and meanwhile, the wiring harness is also convenient to arrange.
In one embodiment, referring to fig. 13 and 14, the rear seat cross member 34 includes an upper U-shaped plate 341 and a lower U-shaped plate 342 disposed opposite to each other in the opening direction, the lower U-shaped plate 342 being plate-inserted into the upper U-shaped plate 341; the upper U-shaped plate 341 is provided with first transverse ribs 343 and first vertical ribs 344, the first transverse ribs 343 are arranged at two sides of the upper U-shaped plate 341, and the first vertical ribs 344 are arranged at the middle of the upper U-shaped plate 341; the lower U-shaped plate 342 is provided with second vertical ribs 345, and the second vertical ribs 345 are arranged at two sides of the lower U-shaped plate 342.
In this example, it is described that the rear seat cross beam 34 includes an upper U-shaped plate 341 and a lower U-shaped plate 342, the upper U-shaped plate 341 and the lower U-shaped plate 342 cooperate to form a through-type support beam, the first transverse ribs 343 are disposed at two sides of the upper U-shaped plate 341, and the first vertical ribs 344 are disposed at a middle position of the upper U-shaped plate 341; the local crumple deformation of the rear seat cross beam 34 is realized, and the second vertical ribs 345 are arranged at the two sides of the lower U-shaped plate 342, so that NVH performance can be met, and the transverse supporting strength of the rear seat cross beam 34 is improved under the condition that the rear seat cross beam 34 is not thickened.
In an embodiment, referring to fig. 2, the threshold beam 1 is provided with at least one first opening 9, the first opening 9 being arranged in the longitudinal direction; the front seat front beam 32, the front seat rear beam 33 and the rear seat beam 34 are respectively provided with a second opening 10, and the second openings 10 are arranged along the transverse direction; the interiors of the threshold beam 1, the front seat front cross member 32, the front seat rear cross member 33 and the rear seat cross member 34 are filled with reinforcing pieces, which cover the first opening 9 and/or the second opening 10.
In this example, when designing the threshold beam 1, the front seat front cross beam 32, the front seat rear cross beam 33, and the rear seat cross beam 34, due to requirements of process, assembly, positioning, electrophoresis, and the like, the threshold beam 1 needs to be provided with the first openings 9, and the first openings 9 are staggered in the X direction; the second open holes 10 are formed in the front seat front cross beam 32, the front seat rear cross beam 33 and the rear seat cross beam 34, the second open holes 10 are staggered along the Y direction, and meanwhile, the first open holes 9 and/or the second open holes 10 for installing the battery pack are filled with reinforcing sheets, so that the rigidity of the mounting point of the battery pack is enhanced, and the safety of the battery pack is improved.
The embodiment of the invention provides an automobile, which comprises a frame and a lower automobile body structure; the lower body structure is mounted on the frame.
As an example, the lower car body structure is mounted on the car frame, a total force transmission path is formed between the two threshold beams 1 and at least two car body cross beams 3, collision force can be well decomposed and transmitted, extrusion force to the lower car body structure is weakened, deformation of the lower car body structure is reduced, zero extrusion of the battery core is guaranteed, and safety of the battery pack is improved. By reasonably planning a force transmission path and matching rigidity, on the premise of no change of the vehicle width required by the platformization, the weight is reduced in a mode of combining various materials and various connection modes, and the intrusion of the lower vehicle body structure after collision is obviously reduced and the battery cell is extruded zero.
The lower vehicle body structure is mainly suitable for protecting the battery pack of the electric/hybrid electric vehicle, so that the lower vehicle body structure meets the requirements of the new C-NCAP rule. Through the design of the flat floor, the seat cross beam is through, and is compatible with different types of battery packs; the doorsill and the cross beam adopt a multi-cavity cross section design, and the filling plug of the inner cavity can be freely selected according to different configurations; through the light weight design, the weight is reduced to the greatest extent by the brand new steel-aluminum hybrid vehicle body, matching with different connection forms such as welding spots, welding seams, FDS, SPR, bolts, structural adhesive and the like; by reasonably planning a force transmission path and designing a deformation energy absorption area and a support area through rigidity matching, the intrusion quantity after collision is remarkably reduced, and the cell is extruded zero.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (16)
1. The lower vehicle body structure is characterized by comprising two threshold beams, a front floor and a beam assembly which are oppositely arranged;
the two side edges of the front floor are respectively connected with the two threshold beams;
the beam assembly is arranged on the front floor and comprises at least two vehicle body beams, and two ends of each vehicle body beam are respectively connected with two threshold beams;
a collision energy absorption structure is arranged in the threshold beam, and a total force transmission path is formed between the two threshold beams and at least two vehicle body cross beams;
A collision energy absorption cavity is arranged in the collision energy absorption structure, and the collision energy absorption structure comprises an energy absorption reinforcing piece arranged in the collision energy absorption cavity;
The energy absorption reinforcement comprises a first reinforcement, wherein the first reinforcement comprises a middle plate, two L-shaped fixing plates which are oppositely arranged and at least one first partition plate;
the two side edges of the middle plate are respectively connected with the two L-shaped fixing plates to form a first reinforcing cavity;
at least one first partition board is arranged in the first reinforcing cavity to separate the first reinforcing cavity and form at least two first extrusion energy absorption cavities;
The opening direction of the first extrusion energy absorption cavity formed by the first reinforcement piece faces to the inner side of the vehicle.
2. The lower body structure according to claim 1, wherein at least two of the body cross members include a front floor cross member, a front seat front cross member, a front seat rear cross member, and a rear seat cross member, which are disposed in this order from front to rear;
A first force transmission path is formed between the threshold beam and the front floor beam;
a second force transmission path is formed between the threshold beam and the front seat front cross beam;
a third force transmission path is formed between the threshold beam and the rear cross beam of the front seat;
A fourth force transmission path is formed between the threshold beam and the rear seat cross beam;
The first, second, third and fourth force transfer paths form the total force transfer path.
3. The lower body structure of claim 2, further comprising a first strap and a second strap;
The first lap joint is assembled on one end of the front seat front cross beam, which is close to the threshold beam, and is connected with the threshold beam, and a second force transmission path is formed among the threshold beam, the front seat front cross beam and the first lap joint;
The second lap joint is assembled on one end of the front seat rear cross beam, which is close to the threshold beam, and is connected with the threshold beam, and a third force transmission path is formed among the threshold beam, the front seat rear cross beam and the second lap joint.
4. The lower body structure according to claim 2, further comprising a center tunnel mounted on the front floor in a longitudinal direction, the center tunnel penetrating sequentially through the front floor cross member, the front seat front cross member, and the front seat rear cross member.
5. The lower body structure according to claim 1, wherein the rocker includes a rocker lower structure and a rocker upper structure extending upward from the rocker lower structure, the rocker upper structure having the collision energy absorbing structure disposed therein;
The inner side edge of the upper structure of the threshold beam extends to form a supporting plate along the horizontal direction; the front floor is lapped on the supporting plate, and two side edges of the front floor are respectively connected with the upper structures of the two threshold beams; two ends of the vehicle body cross beam are respectively connected with the upper structures of the two threshold beams;
and a battery accommodating space is formed between the two threshold beam lower structures, and the threshold beam lower structures are connected with a battery pack assembled in the battery accommodating space.
6. The lower body structure of claim 5, wherein the impact energy absorbing structure comprises at least one first energy absorbing panel and/or at least one second energy absorbing panel;
the first energy absorbing plate is arranged along the horizontal direction and is connected with the left side wall and the right side wall of the upper structure of the threshold beam;
The second energy absorbing plate is arranged along the vertical direction and is connected with the upper side wall and the lower side wall of the upper structure of the threshold beam;
At least one first energy absorption plate and/or at least one second energy absorption plate are matched to form at least two collision energy absorption cavities.
7. The lower body structure of claim 1, wherein the energy absorbing reinforcement comprises a second reinforcement comprising a first tubular body and at least one second bulkhead disposed within the first tubular body, the at least one second bulkhead cooperating with the first tubular body to form at least two second crush energy absorbing cavities;
and a collision induction structure which is formed between the middle position and one edge position of the second reinforcement and is in arc shape and is reduced from outside to inside.
8. The lower body structure according to claim 5, wherein the rocker lower structure includes a lower link plate, an outer link plate and an inner link plate extending in a vertical direction from both side edges of the lower link plate, both of which are connected to the rocker upper structure;
The lower connecting plate is connected with a battery pack assembled in the battery accommodating space.
9. The lower body structure according to claim 8, wherein the battery accommodation space is a space below a region formed between inner side edges of the two rocker upper structures;
The inner connection plate is connected to the middle region of the upper structure of the threshold beam such that a harness installation space for installing a harness is formed between the inner connection plate and the battery pack assembled in the battery receiving space;
The inner connecting plate is provided with a through groove for accommodating the wire harness during collision extrusion.
10. The lower body structure of claim 2, wherein the front floor cross member includes an upper cross member and a lower cross member, the upper cross member overlapping the lower cross member to form a cross member reinforcement cavity;
And a reinforcing beam is arranged in the beam reinforcing cavity.
11. The lower vehicle body structure according to claim 2, characterized in that the front seat front cross member includes a cross member connecting plate provided in a vertical direction, a first U-shaped connecting plate extending from one edge of the cross member connecting plate, a second U-shaped connecting plate extending from the other edge of the cross member connecting plate;
The tail end of the first U-shaped connecting plate is connected with the beam connecting plate, and the tail end of the second U-shaped connecting plate is connected with the beam connecting plate, so that the cross section of the front beam of the front seat is S-shaped.
12. The lower body structure of claim 2, wherein the front seat rear cross member includes a cross member tubular body having a cross member cavity formed therein, a recessed structure formed below the cross member tubular body;
the front seat rear cross beam further comprises a third partition plate arranged in the cross beam tubular body, and the third partition plate is used for separating the cross beam cavities to form at least two cross beam supporting cavities.
13. The lower body structure of claim 12, wherein the cross member tubular body includes a first connecting portion, a second connecting portion, a first arch portion extending upwardly from a middle position of the first connecting portion and a middle position of the second connecting portion, a second arch portion extending upwardly from an inner side edge of the first connecting portion and an inner side edge of the second connecting portion, a gap exists between the second arch portion and the first arch portion, and the second arch portion is the recessed structure.
14. The lower body structure according to claim 2, wherein the rear seat cross member includes an upper U-shaped plate and a lower U-shaped plate disposed opposite to each other in an opening direction, the lower U-shaped plate being embedded in the upper U-shaped plate;
The upper U-shaped plate is provided with a first transverse rib and a first vertical rib, the first transverse rib is arranged at two side positions of the upper U-shaped plate, and the first vertical rib is arranged at the middle position of the upper U-shaped plate;
The lower U-shaped plate is provided with second vertical ribs, and the second vertical ribs are arranged at two sides of the lower U-shaped plate.
15. The lower body structure of claim 2, wherein the threshold beam is provided with at least one first opening, the first opening being disposed in a longitudinal direction;
The front seat front cross beam, the front seat rear cross beam and the rear seat cross beam are respectively provided with a second open pore, and the second open pores are arranged along the transverse direction;
the inside of threshold roof beam, preceding seat front cross beam, preceding seat rear cross beam and back seat cross beam all is filled with the reinforcement piece, the reinforcement piece covers on the first trompil and/or the second trompil.
16. An automobile comprising a frame and the lower body structure of any one of claims 1-15; the lower body structure is mounted on the frame.
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