Integrally cast back door structure and vehicle

Abstract

The invention discloses an integrally-cast back door structure and a vehicle. The technical problems that in the prior art, the size chain is long, and the production rejection rate is high are solved. The integrally-cast back door structure comprises a back door body and a reinforcing piece. The back door body is integrally cast and comprises an inner plate and an outer plate, and a cavity is formed between the inner plate and the outer plate. The reinforcing piece is arranged in the cavity and connected with the inner plate and the outer plate. Compared with an existing welding mode, the integrally-cast back door structure has the advantages that the overall precision of the integrally-cast back door structure is high, the length of an installation size chain of accessories such as a hinge, a supporting rod and a lock is short, and assembly errors caused by too many parts can be reduced. According to the integrally-cast back door structure, integration of the inner plate and the outer plate is achieved through the integrally-cast technology, an inner plate and outer plate combining piece of a traditional back door is eliminated, the length of a size chain is reduced, the rejection rate is reduced, meanwhile, the overall strength and weight distribution are optimized through the reinforcing piece, and the overall performance and the light weight level of the back door are improved.

Description

Technical Field

[0001] The present application belongs to the field of vehicle technology, and specifically relates to an integrally cast tailgate structure and a vehicle. Background Art

[0002] With the rapid development of new energy vehicles, the tailgate system is equipped with more and more sensors and camera controllers. The weight of the traditional steel frame tailgate itself accounts for more than half of the weight of the tailgate system. The plastic frame tailgate requires the inner and outer panels to be welded or bonded. Although the size chain is optimized compared to the steel tailgate, the plastic tailgate is welded or bonded by the inner and outer panels, the scrap rate is high, and the stiffness mode is difficult to meet the standard, which is prone to resonance noise and distortion noise. Summary of the invention

[0003] In order to solve the above technical problems, the present application provides an integrally cast tailgate structure and a vehicle.

[0004] The technical solution adopted to achieve the purpose of this application is that, in the first aspect of this application, the present invention discloses an integrally cast back door structure, comprising:

[0005] A tailgate body, the tailgate body is formed by integral casting, the tailgate body comprises an inner plate and an outer plate, a cavity is formed between the inner plate and the outer plate, the inner plate is provided with a first structure for positioning a wiring harness, and the outer plate is provided with a second structure for positioning glass and taillights;

[0006] A reinforcement member is disposed in the mold cavity and connected to both the inner plate and the outer plate, and the reinforcement member is used to improve the rigidity of the back door body.

[0007] In some embodiments, the reinforcement members are arranged at different locations of the cavity at different densities.

[0008] In some embodiments, the thickness of the inner panel is different at different locations, and the thickness of the outer panel is different at different locations, the reinforcement is arranged at a higher density where the inner panel wall thickness is thinner, and / or the reinforcement is arranged at a higher density where the outer panel wall thickness is thinner.

[0009] In some embodiments, the width of the molding cavity varies at different locations, and the reinforcement is disposed at a greater density at locations where the width of the molding cavity is larger than at locations where the width of the molding cavity is smaller.

[0010] In some embodiments, a sacrificial part having a shell and a filling layer is further included, wherein the shell is protruded from a side of the outer plate away from the inner plate, and the shell and the outer plate are detachably matched; the shell has a buffer cavity, and the filling layer is filled in the buffer cavity.

[0011] In some embodiments, the shell includes an outer shell and an inner shell, the outer shell is detachably matched with the outer plate, the inner shell is connected to the outer shell, and an annular buffer cavity is formed between the inner shell and the outer shell, and the inner shell includes a weight reduction cavity.

[0012] In some embodiments, a density of the reinforcement member proximate the inner shell is less than a density of the reinforcement member proximate the outer shell.

[0013] In some embodiments, the shell is further provided with an extension baffle, which extends upward from the top of the outer side of the shell, and the extension baffle is lower than the window of the back door body.

[0014] In some embodiments, a metal insert is disposed on the back door body, the metal insert is pre-buried in the back door body, and a connection hole connected to the metal insert is reserved on the back door body.

[0015] The technical solution adopted to achieve the purpose of the present application is that, in the second aspect of the present application, the present invention further discloses a vehicle, including the integrally cast tailgate structure as described in the first aspect.

[0016] It can be seen from the above technical solution that the one-piece cast tailgate structure disclosed in the present application includes a tailgate body and a reinforcement. The tailgate body includes an inner plate and an outer plate formed in one piece, and a cavity is formed between the inner plate and the outer plate. The reinforcement is arranged in the cavity and is connected to both the inner plate and the outer plate. Compared with the existing welding method, the one-piece cast tailgate structure has a higher overall precision, and the length of the installation dimension chain of accessories such as hinges, struts, and locks is short, which can reduce the assembly error caused by too many parts.

[0017] The one-piece cast tailgate structure disclosed in the present application adopts an one-piece aluminum cast honeycomb structure, which effectively solves the problems of heavy weight, insufficient rigidity, and complex assembly of existing tailgates. At the same time, the tailgate has the advantages of light weight, high precision, modular production, high degree of freedom in modeling, high recovery ability and high recycling rate. The tailgate body is cast in one piece of aluminum, the overall product precision is high, and the length of the installation dimension chain of accessories such as hinges, struts, and locks is short, which can reduce the assembly error caused by too many parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the technical personnel in the technical field to which the present application belongs to understand the present application more clearly, the technical scheme 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 only 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 the field without creative work are within the scope of protection of the present application.

[0019] Figure 1 A schematic front view of an integrally cast back door structure according to one or more embodiments of the present application;

[0020] Figure 2 for Figure 1 A schematic cross-sectional view at AA;

[0021] Figure 3 for Figure 1 A schematic cross-sectional view at BB;

[0022] Figure 4 for Figure 1 A schematic cross-sectional view at CC;

[0023] Figure 5 for Figure 1 Exploded side view of the integrated cast rear door structure;

[0024] Figure 6 for Figure 5 Schematic cross-sectional view at DD.

[0025] Description of reference numerals:

[0026] 100 - back door body, 110 - outer panel, 120 - inner panel, 130 - cavity, 200 - sacrificial part, 210 - shell, 211 - outer shell, 212 - inner shell, 213 - buffer cavity, 214 - weight reduction cavity, 220 - filling layer, 230 - extension baffle, 300 - metal insert, 400 - reinforcement. DETAILED DESCRIPTION

[0027] In order to make the technical personnel in the technical field to which the present application belongs to understand the present application more clearly, the technical scheme 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 only 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 the field without creative work are within the scope of protection of the present application.

[0028] In addition, the present application may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity, and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides various specific examples of processes and materials, but those of ordinary skill in the art may recognize the application of other processes and / or the use of other materials.

[0029] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0030] The existing tailgate structure usually manufactures the inner panel 120 and the outer panel 110 separately and then assembles them. This method has a long connection dimension chain and a high scrap rate. The embodiment of the present invention discloses an integrally cast tailgate structure and a vehicle, which aims to realize the integration of the inner panel 120 and the outer panel 110 through an integral casting technology, reduce the length of the dimension chain, reduce the scrap rate, and optimize the overall strength and weight distribution by using a reinforcement 400, thereby improving the overall performance and lightweight level of the tailgate.

[0031] The technical solution of the present application is described in detail below through specific embodiments:

[0032] See also Figure 1 and Figure 2 In the first aspect of the present application, an integrally cast tailgate structure is provided, which includes a tailgate body 100 and a reinforcement 400. The tailgate body 100 is integrally cast, and the tailgate body 100 includes an inner plate 120 and an outer plate 110, and a cavity 130 is formed between the inner plate 120 and the outer plate 110. The inner plate 120 is provided with a first structure for positioning the wiring harness pipeline, and the outer plate 110 is provided with a second structure for positioning the glass and the taillight. The reinforcement 400 is arranged in the cavity 130 and is connected to both the inner plate 120 and the outer plate 110. The reinforcement is used to increase the rigidity of the tailgate body so that the rigidity of the tailgate body 100 is more uniform everywhere. Compared with the inner plate 120 and the outer plate 110 cast by integral molding and the existing welding method, the integrally cast tailgate structure has a higher overall precision, and the length of the installation dimension chain of accessories such as hinges, struts, and locks is short, which can reduce the assembly error caused by too many parts.

[0033] With the rapid development of the automobile industry, the safety and lightness of automobiles have become important considerations in design. As an important part of the automobile body, the back door is not only required to have good rigidity and impact resistance, but also to reduce weight as much as possible.

[0034] In some embodiments, the density of the reinforcement members 400 at various positions of the cavity 130 is different. The distribution of the reinforcement members 400 in the cavity 130 is optimized according to the stress conditions, and more reinforcement members 400 are arranged in areas with greater stress to provide additional support and strength. This design can ensure that the tailgate can more effectively disperse and withstand forces when subjected to external forces, thereby improving the stability and durability of the overall structure. Conversely, fewer reinforcement members 400 are arranged in areas with less stress, which can further reduce the total weight of the one-piece cast tailgate structure while ensuring structural strength.

[0035] The first structure may be a structure such as a slot, a hole or a buckle, and the first structure is used to provide positioning points and installation points for parts such as wiring harnesses and interior decorations. The wiring harnesses and interior decorations may be installed on the first structure or may be positioned using only the first structure. The second structure may also be a structure such as a slot, a hole or a buckle, and the second structure is used to provide positioning points and installation points for structures such as glass, taillights and spoilers. The structures such as glass, taillights and spoilers may be installed on the second structure or may be positioned using only the second structure.

[0036] The distribution of the reinforcement 400 in the cavity 130 can be optimized according to the casting process to reduce unnecessary material waste and processing steps. This can not only reduce production costs, but also improve production efficiency and shorten production cycles. In a collision accident, the dense distribution of the reinforcement 400 can more effectively absorb and disperse the impact force, reducing the damage to the vehicle and passengers. In particular, when the rear of the vehicle is hit, the reinforcement 400 can protect the back door body 100 and its surrounding components from serious damage.

[0037] In some embodiments, the density of the reinforcement member 400 can be customized according to the shape, size and performance requirements of the back door body 100. This design flexibility allows designers to pursue a more beautiful design that better matches the overall style of the vehicle while meeting strength requirements.

[0038] For example, when the thickness of the inner panel 120 is different at different locations and the thickness of the outer panel 110 is also different at different locations, the reinforcement 400 is arranged with a higher density at the thinner wall of the inner panel 120 and / or the reinforcement 400 is arranged with a higher density at the thinner wall of the outer panel 110.

[0039] When designing and manufacturing the structure of the inner panel 120 and the outer panel 110, since the inner panel 120 and the outer panel 110 are not regular flat plates, in order to facilitate the installation of modules such as glass, interior and exterior trims, electrical appliances, and wiring harness products, and to avoid the main structure of the vehicle body, the inner panel 120 and the outer panel 110 are usually provided with structures such as holes and grooves, and may also be designed in an arc shape or other shapes. In this case, the thickness of each part of the inner panel 120 and the outer panel 110 will be inconsistent, and therefore, their structural strength will also be different.

[0040] According to the different structural strengths of the inner panel 120 and the outer panel 110 at different locations, the various parts of the back door body 100 are reinforced by the reinforcement 400 to ensure that the structural strength of the back door body 100 at various locations meets the basic requirements. In areas with greater stress, even if the material thickness is thin, the lack of strength can be compensated by increasing the density of the reinforcement 400 to ensure the stability and safety of the overall structure. Under the premise of ensuring structural strength, the weight of the back door can be further reduced by adjusting the thickness of the inner panel 120 and the outer panel 110 and the density of the reinforcement 400. This lightweight design not only helps to reduce the fuel consumption and emissions of the vehicle, but also improves the vehicle's handling and acceleration performance.

[0041] It should be noted that the density mentioned in this embodiment refers to the density of the reinforcement 400, rather than the density of the material of the reinforcement 400 itself. The reinforcement 400 is basically set as a rod-shaped structure with thick ends and thin middle, and the two ends of the reinforcement 400 are supported on the inner panel 120 and the outer panel 110 respectively. And the reinforcement 400 is generally required to ensure that it is arranged perpendicular to at least one of the inner panel 120 and the outer panel 110. That is, in the part where the outer panel 110 is parallel to the inner panel 120, the reinforcement 400 is perpendicular to both the inner panel 120 and the outer panel 110, and in the position where the inner panel 120 and the outer panel 110 are inclined to each other, the reinforcement 400 is required to ensure that it is perpendicular to the inner panel 120 or the outer panel 110.

[0042] For another example, since the widths of the molding cavity 130130 vary at different locations, the density of the reinforcement 400 at the location where the width of the molding cavity 130130 is larger can be greater than the density of the reinforcement 400 at the location where the width of the molding cavity 130130 is smaller, wherein the width referred to here refers to the distance between the inner panel 120 and the outer panel 110.

[0043] The change in the width of the molding cavity 130130 is often related to the stress characteristics of different areas of the back door. In areas with larger widths, since they may be subjected to greater external forces or torques, by increasing the density of the reinforcement 400, it is possible to ensure that these areas have sufficient structural strength, thereby maintaining the overall stability and safety of the back door. Under the premise of ensuring structural strength, by adjusting the density of the reinforcement 400 to adapt to the change in the width of the molding cavity 130130, a lightweight design can be further achieved. In areas with smaller widths, reducing the number or density of reinforcements 400 helps to reduce the overall weight of the back door while maintaining the necessary strength.

[0044] When specifically arranging the density of the reinforcement members 400, CAE analysis is generally performed to obtain the distribution position of each reinforcement member 400. The above analysis is only based on the thickness of the inner panel 120 and the outer panel 110 and the distance between the inner panel 120 and the outer panel 110. When performing CAE analysis, more parameters will be collected for analysis to obtain a more reasonable reinforcement member 400 position distribution plan.

[0045] When using CAE for calculation and analysis, it is generally necessary to first establish an initial version of the 3D model based on experience, and then assign the model material and thickness. After that, establish a constraint, observe the stress conditions of the initial version of the model under the constraint, determine whether the strength of each position is qualified, and then make corresponding adjustments. After the adjustment, establish another constraint and repeat the previous step until all the constraints are applied to the model. The final model is the final model, which can be produced according to the model. The model not only includes the thickness of the inner panel 120 and the outer panel 110, the distance between the inner panel 120 and the outer panel 110, and the layout position of each reinforcement 400, but also includes some other parameters such as holes or slots.

[0046] In some embodiments, the integrally cast tailgate structure also includes a sacrificial part 200 having a shell 210 and a filling layer 220. The sacrificial part 200 is used to absorb the energy of the vehicle in the event of a collision. Generally, when a rear-end collision occurs, the rear vehicle will hit the sacrificial part 200. In the event of a minor collision, the sacrificial part 200 absorbs all the collision energy, and the sacrificial part 200 will be slightly deformed. At this time, it is only necessary to restore the shape of the sacrificial part 200; in the event of a more serious collision, the sacrificial part 200 will absorb all or most of the collision energy, and the sacrificial part 200 will be damaged while the tailgate body 100 will hardly be damaged. At this time, it is only necessary to replace the sacrificial part 200 alone without replacing the entire tailgate, thereby reducing maintenance costs and time. The provision of the sacrificial part 200 not only enhances the impact resistance of the tailgate, but also helps to improve the overall safety of the vehicle. In a collision accident, it can reduce vehicle deformation and provide more living space for occupants.

[0047] The housing 210 is convexly disposed on the side of the outer panel 110 away from the inner panel 120, so that in most cases of rear-end collision, the rear vehicle will hit the sacrificial member 200, thereby protecting the tailgate body 100. The housing 210 and the outer panel 110 are detachably matched, so that the sacrificial member 200 can be removed for maintenance or directly replaced.

[0048] The shell 210 has a buffer cavity 213, and the filling layer 220 is filled in the buffer cavity 213. The provision of the filling layer 220 helps to improve the impact resistance of the sacrificial part 200. Since the shell 210 has the buffer cavity 213, the shell 210 is more likely to deform when impacted, thereby absorbing all the impact energy and avoiding the impact energy from being transferred to the back door body 100. The filling layer 220 can help the shell 210 absorb more energy. In addition, when the sacrificial part 200 is corrected and restored, the filling layer 220 can restore the shell 210 faster.

[0049] The filling layer 220 may be made of foam or rubber. Foam has the advantage of being light in weight, and rubber has the advantage of being highly elastic in recovering from deformation, which can help the deformed shell 210 to quickly correct and restore its shape.

[0050] In some embodiments, the shell 210 includes an outer shell 211 and an inner shell 212. The outer shell 211 is detachably matched with the outer plate 110. The inner shell 212 is connected to the outer shell 211, and an annular buffer cavity 213 is formed between the inner shell 212 and the outer shell 211. The inner shell 212 includes a weight reduction cavity 214.

[0051] By providing the annular buffer cavity 213, the housing 210 can absorb energy from all directions. When the housing 210 is hit, the side of the shell 211 away from the back door body 100 is deformed to absorb the impact energy, and the side of the shell 211 facing the back door body 100 is deformed to absorb the extrusion energy between the shell 211 and the back door body 100.

[0052] The provision of the weight-reducing cavity 214 can reduce the overall weight of the sacrificial component 200 , thereby reducing the overall weight of the integrally cast tailgate structure.

[0053] In some embodiments, the density of the reinforcement 400 near the inner shell 212 is less than the density of the reinforcement 400 near the outer shell 211. By adjusting the density distribution of the reinforcement 400, the overall lightweight of the back door structure can be achieved while ensuring the structural strength. The reinforcement 400 near the inner shell 212 is made of a lower density material, which helps to reduce the overall weight of the back door and improve the fuel economy and performance of the vehicle. The reinforcement 400 near the outer shell 211 is made of a higher density material, which can enhance the back door's ability to resist deformation under external impact. This design enables the back door to better absorb and disperse impact force when encountering a collision or impact, protecting the safety of the occupants in the vehicle. At the same time, the use of high-density reinforcements 400 can also improve the durability of the back door and reduce deformation and damage caused by long-term use and harsh environments.

[0054] By adjusting the density distribution of the reinforcement 400, the stress distribution inside the back door can be optimized. The reinforcement 400 with a lower density can undergo a certain elastic deformation when subjected to stress, thereby absorbing and dispersing stress and avoiding structural damage caused by stress concentration. This design helps to improve the overall rigidity and stability of the back door, so that it can maintain good performance under various working conditions.

[0055] In some embodiments, the housing 211 is further provided with an extension baffle 230, which extends upward from the top of the outer side of the housing 211, and the extension baffle 230 is lower than the window of the back door body 100. As an extension of the housing 211, the extension baffle 230 increases the structural strength of the top of the back door and improves the overall impact resistance of the back door. When the vehicle is driving on rainy days or wading roads, the extension baffle 230 can effectively guide the water flow, reduce the possibility of the water flow directly impacting the top of the back door, thereby reducing noise and vibration. The extension baffle 230 can also prevent water from entering the interior of the back door, reduce the risk of corrosion and damage, and keep the back door in good condition.

[0056] In addition, the design of the extension baffle 230 can be coordinated with the overall style of the back door body 100, enhancing the aesthetics and visual appeal of the vehicle. By selecting appropriate design elements such as material, color and texture, the extension baffle 230 can also add a unique personality element to the vehicle and enhance the recognition of the vehicle.

[0057] In some embodiments, a metal insert 300 is disposed on the back door body 100 . The metal insert 300 is embedded in the back door body 100 , and a connection hole connected to the metal insert 300 is reserved on the back door body 100 .

[0058] The metal insert 300 is usually made of high-strength materials, such as steel or aluminum alloy, which is much stronger than aluminum or other lightweight materials commonly used in the back door body 100. Therefore, the pre-embedded metal insert 300 can significantly improve the structural strength of the back door body 100, making it more able to withstand external impact and pressure. Through the setting of the insert, the glass, interior and exterior trims, clicks, and wiring harnesses are more firmly connected to the back door body.

[0059] In addition, an embedded part for installing the sacrificial part 200 can be reserved on the back door body, and the embedded part can be a nut or a metal block with a threaded hole, and the sacrificial part 200 and the back door body can be detachably matched by screws or bolts. Among them, the nut or the metal block are both embedded metal inserts 300.

[0060] Of course, the connection between the sacrificial member 200 and the tailgate body by threaded fitting is only one implementation in this embodiment. In other implementations, the sacrificial member 200 and the body may also be connected by means such as snap-fitting or bonding.

[0061] In some embodiments, the back door body 100 is cast from aluminum. The density of aluminum is only 1 / 3 of that of steel, and the density of aluminum is much lower than that of traditional steel. Therefore, casting the back door body 100 with aluminum can significantly reduce the weight of the door. Lightweight design helps improve the fuel economy of the vehicle, reduce carbon emissions, and improve the acceleration performance and handling of the vehicle. By combining the back door body 100 with the reinforcement 400, the one-piece cast back door structure can still reduce weight by about 30% compared with the existing welded inner panel 120 and outer panel 110.

[0062] In addition, aluminum is easy to recycle. When the one-piece cast tailgate structure is hit hard and cannot be used any longer, all the aluminum used in its main body can be recycled.

[0063] Through the above embodiments, the one-piece cast tailgate structure disclosed in the present application has at least the following advantages: 1. By adopting an one-piece aluminum cast honeycomb structure and an inlaid insert design, the existing tailgate has effectively solved the problems of heavy weight, insufficient rigidity, and complex assembly. At the same time, the tailgate has the advantages of lightweight, high precision, modular production, high freedom of modeling, high recovery ability and high recycling rate. The tailgate body 100 is cast in one piece of aluminum, the overall product precision is high, and the length of the installation dimension chain of accessories such as hinges, struts, and locks is short, which can reduce the assembly error caused by too many parts. 2. The density of aluminum is only 1 / 3 of that of steel. Combined with the honeycomb reinforcement of the local structure of the cast aluminum tailgate, the weight can still be reduced by about 30%. 3. In the event of a minor collision, only the sacrificial part 200 needs to be repaired. In the event of a severe collision, only the sacrificial part 200 needs to be replaced, which reduces the maintenance cost. 4. Glass, interior and exterior trim, electrical appliances, and wiring harness products are composed of modules, and the overall assembly realizes modular production. The production and assembly are completed at the supplier, and the tailgate assembly is delivered, which reduces the assembly process of the OEM, streamlines the OEM's assembly line, and greatly improves production efficiency.

[0064] Based on the same inventive concept, a second embodiment of the present application discloses a vehicle, which includes a vehicle body and an integrally cast tailgate structure of any embodiment of the first aspect, wherein the tailgate structure is rotatably connected to the vehicle body.

[0065] The vehicle disclosed in the present application is light in weight, and its back door body 100 is manufactured by integral casting, which effectively shortens the installation dimension chain and improves the assembly accuracy. After being hit, in the case of a minor collision, only the sacrificial part 200 needs to be repaired, and in the case of a severe collision, only the sacrificial part 200 needs to be replaced, which reduces the maintenance cost.

[0066] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described above in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0067] Therefore, the above detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0068] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0069] In the description of the present invention, it is necessary to understand that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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 invention.

[0070] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0071] In the present invention, unless otherwise clearly specified and limited, a first feature being above or below a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, a first feature being above, above, and above a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being below, below, and below a second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0072] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0073] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. An integrally cast back door structure, characterized in that: include: A tailgate body, the tailgate body is formed by integral casting, the tailgate body comprises an inner plate and an outer plate, a cavity is formed between the inner plate and the outer plate, the inner plate is provided with a first structure for positioning a wiring harness, and the outer plate is provided with a second structure for positioning glass and taillights; A reinforcement member is disposed in the mold cavity and connected to both the inner plate and the outer plate, and the reinforcement member is used to improve the rigidity of the back door body.

2. The one-piece casting back door structure according to claim 1, characterized in that: The density of the reinforcement members at various positions of the cavity is different.

3. The one-piece casting back door structure according to claim 2, characterized in that: The thickness of the inner panel is different at different places, and the thickness of the outer panel is different at different places. The reinforcement is arranged with a higher density at the thinner wall of the inner panel, and / or the reinforcement is arranged with a higher density at the thinner wall of the outer panel.

4. The one-piece casting back door structure according to claim 2, characterized in that: The width of the molding cavity varies at different locations, and the arrangement density of the reinforcement members at locations where the width of the molding cavity is larger is greater than the arrangement density of the reinforcement members at locations where the width of the molding cavity is reduced.

5. The one-piece casting back door structure according to any one of claims 1 to 4, characterized in that: It also includes a sacrificial component having a shell and a filling layer, wherein the shell is protruding from a side of the outer plate away from the inner plate, and the shell and the outer plate are detachably matched; the shell has a buffer cavity, and the filling layer is filled in the buffer cavity.

6. The integrally cast back door structure according to claim 5, characterized in that: The shell comprises an outer shell and an inner shell, the outer shell is detachably matched with the outer plate, the inner shell is connected to the outer shell, and an annular buffer cavity is formed between the inner shell and the outer shell, and the inner shell comprises a weight reduction cavity.

7. The integrally cast back door structure according to claim 6, characterized in that: The density of the reinforcement member near the inner shell is lower than the density of the reinforcement member near the outer shell.

8. The integrally cast back door structure according to claim 6, characterized in that: The shell is also provided with an extension baffle, which extends upward from the top of the outer side of the shell, and the extension baffle is lower than the window of the back door body.

9. The one-piece casting back door structure according to any one of claims 1 to 4, characterized in that: The back door body is provided with a metal insert, the metal insert is pre-buried in the back door body, and a connection hole connected to the metal insert is reserved on the back door body.

10. A vehicle, characterized in that: It comprises an integrally cast back door structure as described in any one of claims 1 to 9.

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