A lightweight floor structure and vehicle using mixed materials

Abstract

The present application relates to a lightweight floor structure and vehicle made of a hybrid material, belonging to the technical field of automobile body structures. The lightweight floor structure made of a hybrid material includes side floors, which include support plates and longitudinal beams made of ultra-high-strength steel plates. The support plates are connected to the sides of the longitudinal beams by laser welding, so that the support plates and the longitudinal beams are integrally formed after stamping, and the thickness of the support plates is less than the thickness of the inner wall of the longitudinal beams. A middle floor is integrally stamped and formed by aluminum alloy plates and has a cross-section in the shape of a "J". Side floors are symmetrically distributed on both sides of the middle floor, and the longitudinal beams on the side floors are arranged close to each other and fixedly connected to the two sides of the middle floor respectively. The lightweight floor structure of the present application not only ensures the strength and rigidity of the floor structure, but also improves the lightweightness of the floor structure, reduces the number of parts of the floor structure, and improves assembly efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of automobile body structures, and in particular to a lightweight floor structure made of a mixed material and a vehicle. Background Art

[0002] The car body floor is installed at the bottom of the car cockpit and needs to provide the following functions: 1. Protect the safety of people inside the cockpit; 2. Soundproof, heat-insulate and reduce noise for the car cockpit; 3. Be able to meet the force exerted on the floor by people inside the car; 4. Act as a seal to prevent rain, wind and sand from entering the cockpit.

[0003] In the prior art, commercial vehicle cab floor structures are primarily constructed of pure steel. As the primary load-bearing structure, the floor requires a certain level of strength and rigidity. To ensure strength, the floor longitudinal beams, the primary load-bearing components of the floor, utilize a multi-layered structure with numerous components and considerable weight. As the floor is the platform where passengers step, it must be rigid and prevent deformation. This rigidity is related to the thickness of the material, requiring a certain thickness of steel to ensure this rigidity. However, steel, with a density of 7.85 grams per cubic centimeter, is relatively heavy, hindering lightweighting and economical efficiency.

[0004] Therefore, it is necessary to study and improve the above-mentioned vehicle floor structure and provide a lightweight floor structure and vehicle made of mixed materials in order to achieve a more practical purpose. Summary of the Invention

[0005] In response to the shortcomings or one of the shortcomings raised in the above-mentioned background technology, the embodiments of the present application provide a lightweight floor structure and vehicle made of a hybrid material, which not only ensures the strength and rigidity of the floor structure, but also improves the lightweight degree of the floor structure, reduces the number of parts of the floor structure, and improves assembly efficiency.

[0006] In a first aspect, an embodiment of the present application provides a lightweight floor structure made of mixed materials, comprising:

[0007] The side floor comprises a support plate and a longitudinal beam made of ultra-high-strength steel plate. The support plate is connected to the side of the longitudinal beam by laser welding so that the support plate and the longitudinal beam are integrally formed after stamping. The thickness of the support plate is less than the thickness of the inner wall of the longitudinal beam.

[0008] The middle floor is formed by integrally stamping an aluminum alloy plate and has an I-shaped cross section. Side floors are symmetrically distributed on both sides of the middle floor. The longitudinal beams on the side floors are arranged close to each other and are fixedly connected to the two sides of the middle floor respectively.

[0009] In a first aspect, in some embodiments, the cross section of the longitudinal beam is groove-shaped and both side walls extend outward to form side flanges, and the support plate is connected to the side flange of one side edge of the longitudinal beam by laser welding.

[0010] On the first aspect, in some embodiments, both sides of the middle floor have side flaps extending outward, the side flaps are overlapped on the side flanges on both sides of the longitudinal beam and welded to the side flanges on both sides, and an isolation rubber layer is provided between the side flanges and the side flaps.

[0011] In the first aspect, in some embodiments, a plurality of bosses protruding from the lower surface and used to prevent the side flange from rebounding are stamped on the side flange, and the plurality of bosses are arranged at intervals along the longitudinal direction of the side flange.

[0012] On the first aspect, in some embodiments, the front end of the longitudinal beam is fixedly connected to the front beam via a front joint, and the rear end of the longitudinal beam is fixedly connected to the rear beam via a rear joint, the cross-sections of the front joint and the rear joint are both groove-shaped, and the front joint and the rear joint are both made of high modulus carbon fiber material.

[0013] On the first aspect, in some embodiments, the front end of the front joint is provided with a folded edge for connecting to the front beam, and a groove for accommodating the colloid is stamped on a side of the folded edge facing the front beam, and a mounting hole for a fastener to pass through is provided in the center of the groove.

[0014] In the first aspect, in some embodiments, a front end reinforcement member located at the front end of the longitudinal beam and a plurality of middle reinforcement members spaced apart in the longitudinal direction are provided on the inner side of the longitudinal beam.

[0015] In a first aspect, in some embodiments, the front end reinforcement member includes a first bottom plate and two first side plates respectively fixed to the edges of both sides of the first bottom plate, the two first side plates are arranged opposite to each other and each of the two first side plates is provided with a longitudinally extending reinforcement rib;

[0016] An end vertical plate is fixed on the first bottom plate, and an end flap is fixed on one end of the two first side plates close to the end vertical plate. The end flaps on both sides and the end vertical plates are stacked to form a three-layer structure and are welded and fixed.

[0017] On the first aspect, in some embodiments, the central reinforcement includes a second bottom plate and four second side plates respectively fixed to the edges of the second bottom plate, the four second side plates are arranged to form a cylindrical body with a rectangular transverse cross-section, and a reinforcing rib is fixed between each second side plate and the second bottom plate.

[0018] In a second aspect, an embodiment of the present application provides a vehicle, comprising:

[0019] A lightweight floor structure made of a hybrid material as described in any one of the above.

[0020] The beneficial effects of the technical solution provided by this application include:

[0021] The embodiments of the present application provide a lightweight floor structure and vehicle made of a hybrid material, wherein the side floor comprises a support plate and a longitudinal beam made of ultra-high-strength steel plates, wherein the support plate and the side of the longitudinal beam are connected by laser welding so that the support plate and the longitudinal beam are integrally formed after stamping, and the thickness of the support plate is less than the thickness of the inner wall of the longitudinal beam;

[0022] The middle floor is formed by integrally stamping an aluminum alloy plate and has an I-shaped cross section. Side floors are symmetrically distributed on both sides of the middle floor. The longitudinal beams on the side floors are arranged close to each other and are fixedly connected to the two sides of the middle floor respectively.

[0023] Since the floor structure is composed of a central floor and two side floors, the central floor is stamped and formed as a whole by aluminum alloy plates and has an X-shaped cross-section. The density of aluminum alloy plates is lower than that of pure steel plates. Replacing pure steel plates with aluminum alloy plates can significantly reduce weight, thereby reducing the weight of the floor structure and improving the degree of lightweighting.

[0024] The longitudinal beams, the primary load-bearing components, are constructed from ultra-high-strength steel, ensuring the overall strength and rigidity of the floor structure. The support plates are welded to the longitudinal beams and stamped into a single piece. The thickness of the support plates is smaller than the inner wall thickness of the longitudinal beams, further reducing the weight of the floor structure and further enhancing its lightweighting.

[0025] The support plate and the longitudinal beam are made into an integral whole in advance, and the two sides of the middle floor can be covered and connected to the longitudinal beam, so that the two sides of the middle floor are directly supported by the longitudinal beams on both sides. This not only ensures the load-bearing strength of the middle floor, but also reduces the number of parts for the subsequent floor structure assembly workstation, thereby improving assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0027] Figure 1 A schematic diagram of the structure of the side floor provided in an embodiment of the present application;

[0028] Figure 2 A schematic diagram of the connection between the longitudinal beam and the middle floor provided in an embodiment of the present application;

[0029] Figure 3 A schematic diagram of the structure of the boss provided in an embodiment of the present application;

[0030] Figure 4 A schematic diagram of the exploded structure of the floor structure provided in an embodiment of the present application;

[0031] Figure 5 A schematic diagram of the connection between the front beam and the front joint provided in an embodiment of the present application;

[0032] Figure 6 A schematic diagram of the structure of the groove provided in an embodiment of the present application;

[0033] Figure 7 A schematic diagram of the structure of the longitudinal beam provided in an embodiment of the present application;

[0034] Figure 8 A schematic structural diagram of a front end reinforcement member provided in an embodiment of the present application;

[0035] Figure 9 This is a schematic structural diagram of the middle reinforcement provided in an embodiment of the present application.

[0036] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0037] 1. Side floor; 11. Support plate; 12. Longitudinal beam; 121. Side flange; 122. Boss; 2. Middle floor; 21. Side flap; 3. Adhesive layer; 4. Front joint; 41. Folding edge; 42. Groove; 5. Front beam; 6. Rear joint; 7. Rear beam; 8. Front end reinforcement; 81. First bottom plate; 82. First side plate; 83. Reinforcement rib; 84. End vertical plate; 85. End flap; 9. Middle reinforcement; 91. Second bottom plate; 92. Second side plate; 93. Reinforcement rib. DETAILED DESCRIPTION

[0038] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0039] In response to the shortcomings or one of the shortcomings raised in the above-mentioned background technology, the embodiments of the present application provide a lightweight floor structure and vehicle made of a hybrid material, which not only ensures the strength and rigidity of the floor structure, but also improves the lightweight degree of the floor structure, reduces the number of parts of the floor structure, and improves assembly efficiency.

[0040] See also Figures 1 to 9 As shown, the first aspect of the embodiment of the present application provides a lightweight floor structure of mixed materials, including:

[0041] The side floor panel 1 includes a support plate 11 and a longitudinal beam 12 made of ultra-high-strength steel. The support plate 11 and the longitudinal beam 12 are connected by laser welding at their sides so that the support plate 11 and the longitudinal beam 12 are integrally formed after stamping. The thickness of the support plate 11 is less than the inner wall thickness of the longitudinal beam 12.

[0042] The middle floor 2 is formed by integrally stamping an aluminum alloy plate and has an I-shaped cross section. Side floors 1 are symmetrically distributed on both sides of the middle floor 2. The longitudinal beams 12 on the side floors 1 are arranged close to each other and are fixedly connected to the two sides of the middle floor 2 respectively.

[0043] The lightweight floor structure of the embodiment of the present application is assembled by splicing a middle floor 2 and two side floors 1. The middle floor 2 is stamped and formed as a whole by an aluminum alloy plate and has an X-shaped cross-section. The density of the aluminum alloy plate is lower than that of the pure steel plate. Replacing the pure steel plate with the aluminum alloy plate can greatly reduce the weight, thereby reducing the weight of the floor structure and improving the degree of lightweighting.

[0044] Furthermore, in this embodiment, the longitudinal beams 12, the primary load-bearing components, are constructed from ultra-high-strength steel plates, ensuring the overall strength and rigidity of the floor structure. Specifically, the support plates 11 and the side beams 12 are laser-welded together and then integrally stamped to form the side floor panels 1. Because the side floor panels 1 are single-layered and the thickness of the support plates 11 is less than the inner wall thickness of the longitudinal beams 12, the weight of the floor structure can be reduced, further enhancing lightweighting.

[0045] Furthermore, in this embodiment, the support plates 11 and longitudinal beams 12 are fabricated into a single component, namely the side floor panels 1. Both the side floor panels 1 and the center floor panel 2 are single-layer structures. During assembly, the floor structure of this embodiment is simply assembled by fastening two side floor panels 1 to the sides of the center floor panel 2. Compared to existing techniques, this eliminates the need to first weld the left and right floor panels to the center bulge floor panel to form the floor covering, and then weld and secure the floor beams to the undersides of the left and right floor panels.

[0046] Instead, the support plate 11 and the longitudinal beam 12 are made into an integral whole in advance, and the structure of the middle floor 2 is optimized at the same time. The cross-section of the middle floor 2 is in the shape of a "F" (J), that is, side flaps 21 that can cover the longitudinal beams 12 extend from both sides of the middle floor 2. The side flaps 21 are directly supported by the longitudinal beams 12, which ensures the strength of the middle floor 2 as the load-bearing body of the floor structure, and also reduces the number of parts for the subsequent floor structure assembly workstation, thereby improving assembly efficiency.

[0047] It should be noted that to prevent chemical corrosion between the laser-welded support plates 11 and longitudinal beams 12, the support plates 11 and longitudinal beams 12 are made of the same material. In this embodiment, both the support plates 11 and longitudinal beams 12 are constructed from ultra-high-strength steel, ensuring the strength and rigidity of the load-bearing longitudinal beams 12. However, to minimize the overall weight of the floor structure, the support plates 11 are thinned relative to the longitudinal beams 12, contributing to both lightweighting and cost-effectiveness.

[0048] For example, the thickness of the support plate 11 on the side floor 1 in this embodiment is 1 mm, the inner wall thickness of the longitudinal beam 12 is 3 mm, the longitudinal beam 12 is made of hot-formed ultra-high-strength steel plate and has a single-layer trough-shaped steel beam structure, and the middle floor 2 is stamped from an aluminum alloy plate. The density of the aluminum alloy plate is between 2.65 and 2.85 grams per cubic centimeter. It replaces pure steel plate and its weight can be reduced to two-thirds of the original. That is, the floor structure of this embodiment adopts mixed materials and structural optimization to achieve an increase in lightweight.

[0049] In some optional embodiments, see Figures 1 to 9 As shown, an embodiment of the present application provides a lightweight floor structure of a hybrid material, wherein the cross-section of the longitudinal beam 12 of the lightweight floor structure of the hybrid material is groove-shaped and both side walls extend outward to form side flanges 121, and the support plate 11 and the side flange 121 on one side edge of the longitudinal beam 12 are connected by laser welding.

[0050] The longitudinal beams 12 of the lightweight floor structure of this embodiment are channel-shaped steel beams, offering excellent resistance to compression, tension, and torsional forces. To facilitate the connection between the support plate 11 and the central floor 2, the side walls of the longitudinal beams 12 extend outward to form side flanges 121. The edges of these flanges 121 can directly butt against the edges of the support plate 11, facilitating laser welding. Simultaneously, the edges of the central floor 2 can overlap the flanges 121 on both sides, facilitating subsequent welding and securing.

[0051] In some optional embodiments, see Figures 1 to 9 As shown, an embodiment of the present application provides a lightweight floor structure of a hybrid material, wherein both sides of the middle floor 2 of the lightweight floor structure of the hybrid material have side flaps 21 extending outward, and the side flaps 21 are overlapped on the side flanges 121 on both sides of the longitudinal beam 12 and welded to the side flanges 121 on both sides, and an isolation rubber layer 3 is provided between the side flanges 121 and the side flaps 21.

[0052] The lightweight floor structure of this embodiment features outward-extending side flaps 21 on both sides of the central floor panel 2. These flaps 21 conveniently overlap the side flanges 121 on either side of the longitudinal beam 12. When secured to the side flanges 121, these flaps 21 form a rectangular cavity, ensuring overall strength and rigidity. Furthermore, in this embodiment, an insulating adhesive layer 3 is placed between the side flanges 121 and the flaps 21 to prevent chemical corrosion from direct contact between the side flanges 121 and the flaps 21.

[0053] For example, the insulating adhesive layer 3 in this embodiment can be made of structural adhesive. Structural adhesive has the advantages of excellent bonding strength, can withstand large loads, and is resistant to aging, fatigue, and corrosion, with stable performance throughout its expected lifespan. The structural adhesive effectively isolates the side flange 121 from the side flap 21. Furthermore, conductive materials can be mixed into the structural adhesive to impart a certain degree of conductivity. This facilitates spot welding of the side flange 121 and the side flap 21 after adhesive application. The high temperature of welding strengthens the connection between the side flange 121, the side flap 21, and the structural adhesive.

[0054] It should be noted that in this embodiment, the side flange 121 is made of aluminum alloy, and the side flap 21 is made of steel. Direct contact between aluminum alloy and steel can cause chemical corrosion, so adhesive welding is used to secure the connection. For example, the weld surface is fully coated with adhesive to isolate the overlapping surfaces of the two parts. To ensure sufficient welding space and weld strength, the weld point diameter on the part surface is required to be 6 mm, and the weld edge width is 15 to 20 mm. The weld edge width ensures sufficient welding space, and the narrower the weld edge width, the more conducive it is to lightweighting.

[0055] The welding points on the surface of the parts are set on the lower surface of the side flange 121 and the upper surface of the side flap 21. After the structural adhesive is heated by the high temperature generated by welding, the bonding effect of the structural adhesive can be strengthened. The distance between the upper and lower side welding points is generally between 150 and 200 mm. In addition, welding requires materials that are conducive to current conduction. Structural adhesives mixed with conductive powder (such as silver powder or carbon powder) can be used. The longitudinal beam 12 can be surface galvanized to further improve corrosion resistance. After welding, the structural adhesive still isolates the aluminum alloy and steel, ensuring the connection strength of the aluminum alloy and steel.

[0056] In some optional embodiments, see Figures 1 to 9 As shown, an embodiment of the present application provides a lightweight floor structure made of a hybrid material, wherein a plurality of bosses 122 protruding from the lower surface and used to prevent the side flange 121 from rebounding are stamped on the side flange 121, and the plurality of bosses 122 are arranged at intervals along the longitudinal direction of the side flange 121.

[0057] The side flange 121 of the lightweight floor structure of the embodiment of the present application is stamped and formed on the longitudinal beam 12, and forms an angle close to a right angle with the side wall of the longitudinal beam 12. In order to prevent the side flange 121 from rebounding and deviating from the designed position, a plurality of bosses 122 protruding from the lower surface are stamped on the side flange 121. The bosses 122 can enhance the angular shape stability of the side flange 121 and ensure that the angle of the side flange 121 meets the requirements.

[0058] For example, the longitudinal beam 12 is made of ultra-high strength steel DP800 and has a U-shaped flange structure. The cross-sectional area of ​​the longitudinal beam 12 affects the torsional rigidity. Considering that the cross-sectional area of ​​the longitudinal beam 12 is the largest and the process production requirements of the parts are met, the angle between the side flange 121 and the side wall of the longitudinal beam 12 is strictly controlled to be between 93 and 95 degrees.

[0059] The bosses 122 are spaced 300 mm apart and arranged longitudinally on the side flange 121, which can effectively stabilize the position of the side flange 121 and ensure that the angle of the side flange 121 meets the requirements. In this embodiment, the longitudinal beam 12 is stamped out of only one steel plate, integrating the original multiple parts into one, saving welding technology and manufacturing costs.

[0060] In some optional embodiments, see Figures 1 to 9 As shown, an embodiment of the present application provides a lightweight floor structure made of a hybrid material, in which the front end of the longitudinal beam 12 of the lightweight floor structure of the hybrid material is fixedly connected to the front beam 5 via a front joint 4, and the rear end of the longitudinal beam 12 is fixedly connected to the rear beam 7 via a rear joint 6. The cross-sections of the front joint 4 and the rear joint 6 are both groove-shaped, and the front joint 4 and the rear joint 6 are both made of high modulus carbon fiber material.

[0061] The front beam 5 and rear beam 7 of the lightweight floor structure of the embodiment of the present application are used to be fixedly connected to the vehicle. To ensure the reliability of the connection between the two and the longitudinal beam 12, the front beam 5 and the rear beam 7 are fixedly connected to the front and rear ends of the longitudinal beam 12 through the front joint 4 and the rear joint 6 respectively. The front joint 4 and the rear joint 6 are both made of high modulus carbon fiber material, which meets the lightweight requirements while also meeting the strength requirements.

[0062] It should be noted that the structural strength of high modulus carbon fiber can reach five times that of steel, with good lightweight effect, and the weight of steel can be reduced by 50% after replacement. However, due to its high price, large-scale use is not conducive to overall cost control. Therefore, in this embodiment, carbon fiber joints are only provided at the connection positions between the beams, which can achieve lightweight and meet high strength requirements.

[0063] In some optional embodiments, see Figures 1 to 9As shown, an embodiment of the present application provides a lightweight floor structure made of a hybrid material, wherein a front end of a front joint 4 of the lightweight floor structure made of a hybrid material is provided with a folded edge 41 for connecting to a front beam 5, and a groove 42 for accommodating a colloid is stamped on a side of the folded edge 41 facing the front beam 5, and a mounting hole for a fastener to pass through is provided in the center of the groove 42.

[0064] The front end of the lightweight floor structure of the present embodiment is integrally formed with an outward-turned hem 41. This hem 41 is provided with a mounting hole and a groove 42. The opening of the groove 42 faces the connection side of the front beam 5, and the mounting hole is located in the center of the groove 42. Before installing the bolt fasteners, glue is first applied to the groove 42 to strengthen the connection between the parts using the adhesive strength of the glue. The bolt fasteners are then used to lock the connection. It should be noted that this bolt-and-glue connection effectively ensures connection strength. This installation method can be used at both ends of the front and rear joints 4 and 6 to enhance connection strength.

[0065] In some optional embodiments, see Figures 1 to 9 As shown, an embodiment of the present application provides a lightweight floor structure of a hybrid material, wherein a front end reinforcement 8 located at the front end of the longitudinal beam 12 and a plurality of middle reinforcements 9 arranged at intervals along the longitudinal direction are provided on the inner side of the longitudinal beam 12 of the lightweight floor structure of the hybrid material.

[0066] The lightweight floor structure of this embodiment of the present application has a front reinforcement 8 and multiple middle reinforcements 9 fixedly connected to the inner side of the longitudinal beam 12. This further enhances the strength of the longitudinal beam 12, increases the upper load limit of the longitudinal beam 12, and ensures the supporting effect of the longitudinal beam 12. Specifically, the front reinforcement 8 is fixed to the inner side of the longitudinal beam 12 and located at the front end of the longitudinal beam 12. The multiple middle reinforcements 9 are arranged at intervals along the longitudinal direction of the longitudinal beam 12, which can enhance the strength of the longitudinal beam 12 and facilitate the thin and lightweight design of the longitudinal beam 12, thereby improving the lightweight performance.

[0067] In some optional embodiments, see Figures 1 to 9 As shown, the embodiment of the present application provides a hybrid material lightweight floor structure, wherein the front end reinforcement 8 of the hybrid material lightweight floor structure includes a first bottom plate 81 and two first side plates 82 respectively fixed to the two side edges of the first bottom plate 81, the two first side plates 82 are arranged opposite to each other and each of the two first side plates 82 is provided with a longitudinally extending reinforcement rib 83;

[0068] An end vertical plate 84 is fixed to the first bottom plate 81 , and an end flap 85 is fixed to one end of the two first side plates 82 close to the end vertical plate 84 . The end flaps 85 on both sides and the end vertical plates 84 are stacked to form a three-layer structure and are welded and fixed.

[0069] The front end reinforcement 8 of the present embodiment is a box-shaped reinforcement, comprising a first bottom plate 81, a first side plate 82, an end vertical plate 84, and an end flap 85. Two first side plates 82 are integrally connected to the edges of the first bottom plate 81. The two first side plates 82 are positioned opposite each other and are used to abut the side walls of the longitudinal beam 12. The first side plates 82 are provided with reinforcing ribs 83 protruding toward the side of the first bottom plate 81 to further enhance structural strength.

[0070] For example, in this embodiment, to facilitate the installation of the front reinforcement member 8 onto the longitudinal beam 12, mounting holes are provided on the first bottom plate 81. Furthermore, to enhance the collision resistance of the front end of the longitudinal beam 12, the front ends of the two first side plates 82 are integrally connected with end flaps 85, and the front end of the first bottom plate 81 is integrally connected with end vertical plates 84. The two end flaps 85 and the end vertical plates 84 are stacked to form a three-layer structure, which is then welded and fixed. The three-layer structure is arranged at the front end of the longitudinal beam 12, thereby effectively enhancing the collision resistance of the front end of the longitudinal beam 12.

[0071] In some optional embodiments, see Figures 1 to 9 As shown, an embodiment of the present application provides a lightweight floor structure made of a hybrid material, wherein the central reinforcement 9 of the lightweight floor structure made of a hybrid material includes a second bottom plate 91 and four second side plates 92 respectively fixed to the edges of the second bottom plate 91, the four second side plates 92 are arranged to form a cylindrical body with a rectangular transverse cross-section, and a reinforcing rib 93 is fixed between each second side plate 92 and the second bottom plate 91.

[0072] The central reinforcement member 9 of the present embodiment is a box-shaped reinforcement member, comprising a second bottom plate 91 and second side plates 92. There are four second side plates 92, which are integrally connected to the four edges of the second bottom plate 91. The four second side plates 92 are integrally connected to each other and form a cylindrical body with a rectangular transverse cross-section, which facilitates installation inside the longitudinal beam 12. Reinforcing ribs 93 are welded and fixed between the second side plates 92 and the second bottom plate 91 to further enhance structural strength.

[0073] For example, to facilitate the installation of the front reinforcement member 8 on the longitudinal beam 12, ear plates with mounting holes are integrally connected to both sides of the first base plate 81. The central reinforcement member 9 in this embodiment can be constructed of cast aluminum. With its four-sided enclosed structure, it offers the advantages of light weight and high strength, excellent reinforcement, and convenient placement at various locations on the longitudinal beam 12. It offers excellent versatility and saves on mold costs.

[0074] See also Figures 1 to 9 As shown, a second aspect of an embodiment of the present application provides a vehicle, comprising:

[0075] A lightweight floor structure made of a hybrid material according to any of the above embodiments.

[0076] The vehicle of the embodiment of the present application adopts a lightweight floor structure of a mixed material of any of the above embodiments, which not only ensures the strength and rigidity of the vehicle, but also improves the lightweight degree of the vehicle, reduces the number of parts of the vehicle, and improves assembly efficiency.

[0077] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0078] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0079] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A lightweight floor structure made of mixed materials, characterized in that: include: A side floor (1) comprises a support plate (11) and a longitudinal beam (12) made of ultra-high strength steel plates, wherein the support plate (11) and the side edges of the longitudinal beam (12) are connected by laser welding so that the support plate (11) and the longitudinal beam (12) are integrally formed after stamping, and the thickness of the support plate (11) is less than the inner wall thickness of the longitudinal beam (12); The middle floor (2) is formed by integrally stamping an aluminum alloy plate and has a cross-section in the shape of an "X"; side floors (1) are symmetrically distributed on both sides of the middle floor (2); longitudinal beams (12) on the side floors (1) on both sides are arranged close to each other and are respectively fixedly connected to the two sides of the middle floor (2).

2. The lightweight floor structure made of hybrid materials according to claim 1, characterized in that: The cross section of the longitudinal beam (12) is groove-shaped and both side walls extend outward to form side flanges (121); the support plate (11) and the side flanges (121) on one side edge of the longitudinal beam (12) are connected by laser welding.

3. The lightweight floor structure made of hybrid materials according to claim 2, characterized in that: Both sides of the middle floor (2) are provided with outwardly extending side flaps (21), the side flaps (21) are overlapped on the side flanges (121) on both sides of the longitudinal beam (12) and are welded and fixed to the side flanges (121) on both sides, and an isolation rubber layer (3) is provided between the side flanges (121) and the side flaps (21).

4. The lightweight floor structure made of hybrid materials according to claim 2, characterized in that: The side flange (121) is stamped with a plurality of bosses (122) protruding from the lower surface and used to prevent the side flange (121) from rebounding. The plurality of bosses (122) are arranged at intervals along the longitudinal direction of the side flange (121).

5. The lightweight floor structure made of hybrid materials according to claim 1, characterized in that: The front end of the longitudinal beam (12) is fixedly connected to the front beam (5) via a front joint (4), and the rear end of the longitudinal beam (12) is fixedly connected to the rear beam (7) via a rear joint (6). The cross sections of the front joint (4) and the rear joint (6) are both groove-shaped, and the front joint (4) and the rear joint (6) are both made of high-modulus carbon fiber material.

6. The lightweight floor structure made of hybrid materials according to claim 5, characterized in that: The front end of the front joint (4) is provided with a folded edge (41) for connecting to the front beam (5); a groove (42) for accommodating a colloid is punched on a side of the folded edge (41) facing the front beam (5); a mounting hole for a fastener to pass through is provided in the center of the groove (42).

7. The lightweight floor structure made of hybrid materials according to claim 1, characterized in that: The inner side of the longitudinal beam (12) is provided with a front end reinforcement member (8) located at the front end of the longitudinal beam (12), and a plurality of middle reinforcement members (9) arranged at intervals along the longitudinal direction.

8. The lightweight floor structure made of hybrid materials according to claim 7, characterized in that: The front end reinforcement member (8) includes a first bottom plate (81) and two first side plates (82) respectively fixed to the edges of both sides of the first bottom plate (81), the two first side plates (82) are arranged opposite to each other, and the two first side plates (82) are both provided with reinforcement ribs (83) extending in the longitudinal direction; An end vertical plate (84) is fixed on the first bottom plate (81), and an end flap (85) is fixed on one end of each of the two first side plates (82) close to the end vertical plate (84). The end flaps (85) and the end vertical plates (84) on both sides are stacked to form a three-layer structure and are welded and fixed.

9. The lightweight floor structure made of hybrid materials according to claim 7, characterized in that: The middle reinforcement member (9) includes a second bottom plate (91) and four second side plates (92) respectively fixed to the edges of the second bottom plate (91). The four second side plates (92) are arranged to form a cylindrical body with a rectangular transverse cross-section. A reinforcement rib (93) is fixed between each second side plate (92) and the second bottom plate (91).

10. A vehicle, characterized in that: include: A lightweight floor structure made of a hybrid material according to any one of claims 1 to 9.

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