Lightweight floor structure made of mixed material and vehicle

Abstract

The invention relates to a light-weight floor structure made of mixed materials and a vehicle, and belongs to the technical field of automobile body structures, the light-weight floor structure made of the mixed materials comprises a side floor, the side floor comprises a supporting plate and a longitudinal beam which are made of ultrahigh-strength steel plates, and the supporting plate is connected with the side edge of the longitudinal beam through tailored blank laser welding; the supporting plate and the longitudinal beam are integrally formed after being stamped, and the thickness of the supporting plate is smaller than that of the inner wall of the longitudinal beam; the middle floor is formed by integrally punching an aluminum alloy plate, the cross section of the middle floor is in an n shape, side floors are symmetrically distributed on the two sides of the middle floor, and the longitudinal beams on the side floors on the two sides are arranged close to each other and fixedly connected with the two side edges of the middle floor respectively. According to the lightweight floor structure, the strength and rigidity of the floor structure are guaranteed, meanwhile, the lightweight degree of the floor structure is improved, the number of parts of the floor structure is reduced, and the assembly efficiency is improved.

Description

Technical Field

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

[0002] The car body floor is installed at the bottom of the car cockpit, and its functions include: 1. protecting the safety of people inside the cockpit; 2. providing sound insulation, heat insulation, and noise reduction for the car cockpit; 3. meeting the force exerted on the floor by people inside the car; 4. providing a seal to prevent rain, wind, and sand from entering the cockpit.

[0003] In the related art, the floor structure of the cab of commercial vehicles is mainly made of pure steel. As the main load-bearing structure, the floor needs certain strength and rigidity. To ensure strength, the main load-bearing component of the floor, the floor longitudinal beam, adopts a multi-layer plate structure with many parts and heavy weight. As the place where passengers step on, the floor must not be deformed and has a certain rigidity. The rigidity is related to the thickness of the material, so a certain thickness of steel is required to ensure rigidity and it cannot be too thin. However, the density of steel is 7.85 grams per cubic centimeter, which is heavy and not conducive to lightweight and economy.

[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 deficiencies or one of the deficiencies raised by 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 of a mixed material, comprising:

[0007] The side floor comprises a support plate and a longitudinal beam made of ultra-high strength steel plates, wherein 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, and the thickness of the support plate is less than the inner wall thickness 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 respectively fixedly connected to the two sides of the middle floor.

[0009] In the 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 are welded and fixed 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] In 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, 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 disposed on the inner side of the longitudinal beam.

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

[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 are stacked with the end vertical plates to form a three-layer structure and are welded and fixed.

[0017] On the first aspect, in some embodiments, the middle reinforcement member 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 reinforcement 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, including:

[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 embodiment of the present application provides a lightweight floor structure and a vehicle made of a mixed material, a side floor, which includes a support plate and a longitudinal beam made of ultra-high strength steel plates, 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 inner wall thickness 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 respectively fixedly connected to the two sides of the middle floor.

[0023] Since the floor structure is composed of a middle floor and two side floors, the middle floor is stamped from an aluminum alloy plate in one piece 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 an aluminum alloy plate can significantly reduce weight, thereby reducing the weight of the floor structure and improving the degree of lightweighting.

[0024] At the same time, the longitudinal beam, which is the main load-bearing component, is made of ultra-high-strength steel plates to ensure the overall strength and rigidity of the floor structure. While the support plate and the longitudinal beam are welded and stamped into one piece, the thickness of the support plate is smaller than the thickness of the inner wall of the longitudinal beam, which can reduce the weight of the floor structure and further improve the lightweight degree.

[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 floor structure assembly station in the subsequent process, thereby improving the 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 drawings required for use in the description of the embodiments will be briefly introduced below. 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 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 the 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 the embodiment of the present application;

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

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

[0035] Fig. 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 listed as follows:

[0037] 1. Side floor; 11. Support plate; 12. Longitudinal beam; 121. Side flange; 122. Boss; 2. Middle floor; 21. Side flap; 3. Glue 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] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0039] In response to the deficiencies or one of the deficiencies raised by 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 1 includes a support plate 11 and a longitudinal beam 12 made of ultra-high strength steel plates. The sides of the support plate 11 and 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;

[0042] The middle floor 2 is integrally stamped from an aluminum alloy plate and has a cross-section in the shape of a "X". 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 both sides of the middle floor 2 respectively.

[0043] The lightweight floor structure of the embodiment of the present application is assembled by a middle floor 2 and two side floors 1. The middle floor 2 is formed by integrally stamping an aluminum alloy plate and has an I-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 an aluminum alloy plate can significantly reduce weight, thereby reducing the weight of the floor structure and improving the degree of lightweighting.

[0044] Furthermore, the longitudinal beam 12 as the main load-bearing component in this embodiment is made of ultra-high strength steel plate, which ensures the overall strength and rigidity of the floor structure. Specifically, the side edges of the support plate 11 and the longitudinal beam 12 are connected by laser welding and then integrally stamped to form the side floor 1. Since the side floor 1 is a single-layer structure and the thickness of the support plate 11 is less than the thickness of the inner wall of the longitudinal beam 12, the weight of the floor structure can be reduced, further improving the degree of lightweight.

[0045] Moreover, in this embodiment, the support plate 11 and the longitudinal beam 12 are made into one component, namely the side floor 1. The side floor 1 and the middle floor 2 are both single-layer structures. When assembling, it is only necessary to fix two side floors 1 on both sides of the middle floor 2 to obtain the floor structure of this embodiment. Compared with the prior art, it is not necessary to first weld the left and right floors to the middle bulge floor to form a floor covering, and then weld and fix the floor beams to the lower surfaces of the left and right floors.

[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. The cross-section of the middle floor 2 is in a "J" shape, that is, side flaps 21 that can cover the longitudinal beams 12 are extended on 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, reduces the number of parts for the floor structure assembly work in the subsequent process, and improves the assembly efficiency.

[0047] It should be noted that in order to avoid chemical corrosion between the laser-welded support plate 11 and the longitudinal beam 12, the support plate 11 and the longitudinal beam 12 are made of the same material. In this embodiment, the support plate 11 and the longitudinal beam 12 are both made of ultra-high-strength steel plates, which ensures the strength and rigidity of the longitudinal beam 12, which is the main body of the load-bearing structure. However, in order to avoid the overall weight of the floor structure, the support plate 11 is thinned relative to the longitudinal beam 12, which is conducive to lightweight and economy.

[0048] For example, in this embodiment, the thickness of the support plate 11 on the side floor 1 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 with a density of 2.65 to 2.85 grams per cubic centimeter. By replacing pure steel plates, the weight can be reduced to two-thirds of the original. That is, the floor structure of this embodiment uses 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 beam 12 of the lightweight floor structure of the embodiment of the present application is a channel steel beam with good compression, tension and torsion resistance. In order to facilitate the connection between the support plate 11 and the middle floor 2, the two side walls of the longitudinal beam 12 extend outward to form side flanges 121. The edge of the side flange 121 can directly connect to the edge of one side of the support plate 11 to facilitate laser welding. At the same time, the edge of the middle floor 2 can cover the side flanges 121 on both sides to facilitate subsequent welding and fixing.

[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 central floor 2 of the lightweight floor structure of the hybrid material have side flaps 21 extending outward, 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 arranged between the side flanges 121 and the side flaps 21.

[0052] The middle floor 2 of the lightweight floor structure of the embodiment of the present application has side flaps 21 extending outward on both sides. The side flaps 21 are conveniently overlapped on the side flanges 121 on both sides of the longitudinal beam 12. After the side flaps 21 are fixed to the side flanges 121 on both sides, a cavity with a rectangular cross-section can be formed to ensure overall strength and rigidity. In addition, in this embodiment, an isolation rubber layer 3 is arranged between the side flanges 121 and the side flaps 21 to prevent the side flanges 121 from directly contacting the side flaps 21 and causing chemical corrosion.

[0053] For example, the isolation adhesive layer 3 in this embodiment can be made of structural adhesive, which has the advantages of good bonding strength, can withstand large loads, and is resistant to aging, fatigue, and corrosion, and has stable performance within the expected life. The structural adhesive can effectively isolate the side flange 121 and the side flap 21, and the structural adhesive can be mixed with conductive materials to make itself have a certain conductivity, so that after adding glue, the side flange 121 and the side flap 21 are spot welded, and the side flange 121 and the side flap 21 are more firmly connected to the structural adhesive through high welding temperature.

[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. The direct contact between aluminum alloy and steel will cause chemical corrosion, so glue welding is used for fixed connection. For example, the welding surface needs to be fully coated with glue to isolate the overlapping surfaces of the two parts. In order to ensure the welding space and welding strength, the diameter of the welding point on the surface of the part is required to be 6 mm, and the welding edge width is 15 to 20 mm. The welding edge width can ensure the welding space. The narrower the welding edge width, the more conducive to lightweight.

[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 spacing between the upper and lower 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 powders (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 and formed 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] Exemplarily, the longitudinal beam 12 is made of ultra-high strength steel DP800, and the longitudinal beam 12 adopts 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 93 to 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 of a hybrid material, in which the front end of a longitudinal beam 12 of the lightweight floor structure of the hybrid material is fixedly connected to a front beam 5 via a front joint 4, and the rear end of the longitudinal beam 12 is fixedly connected to a 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 the rear beam 7 of the lightweight floor structure of the embodiment of the present application are used for fixed connection with 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 joint 4 of the lightweight floor structure made of a hybrid material is provided at the front end with a folded edge 41 for connecting to a front beam 5, 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 front joint 4 of the lightweight floor structure of the embodiment of the present application is integrally formed with an outward-turned folded edge 41, and the folded edge 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 provided in the center of the groove 42. Before installing the bolt fasteners, glue is first applied in the groove 42, and the bonding strength of the glue is used to strengthen the strength of the connection between the parts, and then the bolt fasteners are used to lock. It should be noted that the bolt and glue connection method here effectively ensures the connection strength. Both ends of the above-mentioned front joint 4 and rear joint 6 can adopt this installation method to improve the 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 arranged inside the longitudinal beam 12 of the lightweight floor structure of the hybrid material.

[0066] The front end reinforcement 8 and a plurality of middle reinforcements 9 are fixedly connected to the inner side of the longitudinal beam 12 of the lightweight floor structure of the embodiment of the present application, which can further improve the strength of the longitudinal beam 12, increase the upper limit of the load of the longitudinal beam 12, and ensure the supporting effect of the longitudinal beam 12. Specifically, the front end reinforcement 8 is fixed to the inner side of the longitudinal beam 12 and located at the front end of the longitudinal beam 12, and the plurality of middle reinforcements 9 are arranged at intervals along the longitudinal direction of the longitudinal beam 12, which can improve the strength of the longitudinal beam 12, facilitate the lightweight design of the longitudinal beam 12, and thus improve the lightweight degree.

[0067] In some optional embodiments, see Figures 1 to 9 As shown, the embodiment of the present application provides a lightweight floor structure of a hybrid material, wherein the front end reinforcement member 8 of the lightweight floor structure of the hybrid material comprises 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 both first side plates 82 are provided with reinforcement ribs 83 extending in the longitudinal direction;

[0068] An end vertical plate 84 is fixed on the first bottom plate 81 , and an end flap 85 is fixed on 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 fixed by welding.

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

[0070] For example, in this embodiment, in order to facilitate the installation of the front reinforcement 8 on the longitudinal beam 12, a mounting hole is provided on the first bottom plate 81. In addition, in order to improve the collision strength of the front end of the longitudinal beam 12, the front ends of the two first side plates 82 are integrally connected with the end flaps 85, and the front end of the first bottom plate 81 is integrally connected with the end vertical plate 84. The two end flaps 85 and the end vertical plate 84 are stacked to form a three-layer structure and then welded and fixed. The three-layer structure is arranged at the front end of the longitudinal beam 12, thereby effectively improving the collision strength 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 of a hybrid material, wherein the middle reinforcement 9 of the lightweight floor structure of the 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 embodiment of the present application is a box-shaped reinforcement member, and the central reinforcement member 9 includes a second bottom plate 91 and a second side plate 92. The number of the second side plates 92 is four, and the four second side plates 92 are integrally connected to the edges of the second bottom plate 91. The four second side plates 92 are integrally connected to each other and surround to form a cylindrical body with a rectangular transverse cross-section, which is convenient for installation on the inner side of the longitudinal beam 12. A reinforcing rib 93 is welded and fixed between the second side plate 92 and the second bottom plate 91 to further improve the 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 bottom plate 81. The middle reinforcement member 9 in this embodiment can be a cast aluminum structure, and the four-sided closed structure has the advantages of light weight and high strength, good reinforcement effect, convenient arrangement at different positions on the longitudinal beam 12, good versatility, and can save mold costs.

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

[0075] A lightweight floor structure made of a hybrid material according to any one 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-mentioned 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 the present application, it should be noted that the terms "upper", "lower", etc. 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 the present application and simplifying the description, rather than indicating or implying 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 the present 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 it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present 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 only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such 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 including 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, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0079] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A lightweight floor structure of mixed materials, characterized in that: include: A side floor (1), comprising a support plate (11) and a longitudinal beam (12) made of ultra-high strength steel plates, wherein the side edges of the support plate (11) and 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 a "X". Side floors (1) are symmetrically distributed on both sides of the middle floor (2). The 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 side edges of the middle floor (2).

2. The lightweight floor structure of mixed materials as claimed in 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 flange (121) at one side edge of the longitudinal beam (12) are connected by laser welding.

3. The lightweight floor structure of mixed materials as claimed in claim 2, characterized in that: Both sides of the middle floor (2) are provided with side flaps (21) extending outwards, 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 of mixed materials as claimed in 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 in the longitudinal direction of the side flange (121).

5. The lightweight floor structure of mixed materials as claimed in 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 of mixed 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 one 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 of mixed 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 in the longitudinal direction.

8. The lightweight floor structure of mixed materials according to claim 7, characterized in that: The front end reinforcement member (8) comprises 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 both of the two first side plates (82) are 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 the two first side plates (82) close to the end vertical plate (84), and the end flaps (85) on both sides are stacked with the end vertical plates (84) to form a three-layer structure and are welded and fixed.

9. The lightweight floor structure of mixed materials according to claim 7, characterized in that: The middle reinforcement member (9) comprises 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) being arranged to form a cylindrical body with a rectangular transverse cross section, and 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 as claimed in any one of claims 1 to 9.

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