Lower vehicle body structure and integral vehicle body structure with same

Abstract

The utility model relates to the field of vehicle bodies, in particular to a lower vehicle body structure and an integral vehicle body structure with the lower vehicle body structure, which comprises a lower vehicle body formed by integral die-casting; the lower vehicle body comprises a battery pack shell, and a front cabin structure and a rear floor structure are arranged at the two ends of the battery pack shell respectively; the lower vehicle body structure designed by the utility model can be produced by adopting an integrated die-casting forming process, so that the integrity of the lower vehicle body is greatly improved; meanwhile, the whole structure of the lower vehicle body is made of aluminum alloy, and most of the front cabin, the battery pack shell and most of the rear floor are integrated through Z-direction mold stripping; meanwhile, the lower vehicle body structure adopts an integrated die-casting structure, so that the sealing performance of the vehicle body is improved, and the glue consumption is greatly reduced; meanwhile, welding deformation caused by traditional welding of a large number of metal plates is reduced, and the size precision of a vehicle body is improved.

Description

Technical Field

[0001] The utility model relates to the field of vehicle bodies, in particular to a lower vehicle body structure and an integral vehicle body structure having the lower vehicle body structure. Background Art

[0002] The underbody of a car is the carrier of the entire car. In the prior art, the underbody of a car consists of a front cabin assembly, a front floor welding assembly and a rear floor welding assembly. The underbody of a car is welded and assembled from about 210 sheet metal stamping parts.

[0003] The lower body of the car is welded to the upper body of the car by conventional resistance spot welding (or CO 2 The number of various stamping parts generally reaches about 350.

[0004] In order to develop a brand new body-in-white assembly, experienced professional body designers are needed to accurately grasp the layout and block division of the body-in-white assembly structure. At the same time, it is also necessary to fully analyze and verify from the aspects of CAE, collision, NVH and four major processes (stamping, welding, painting, and assembly). The number of parts to be developed is large and the development cycle is long, which makes it difficult to fully meet the current needs of automobile upgrades and rapid iterations.

[0005] At present, the battery installation structure of electric vehicles is to assemble the battery cells into modules, and then assemble the modules into a battery box (also called a pack). Then, mounting brackets are designed around the battery box and connected to the lower body of the car by bolts.

[0006] This traditional battery installation structure has the problem that the module housing and the battery pack overlap, the battery pack overlaps with the front floor structure, the front floor structure seat beam and the battery pack beam have similar and overlapping structures and functions, and the battery pack frame structure overlaps with the lower body frame structure. This is not conducive to the lightweighting of electric vehicles and the rapid iteration of the development process.

[0007] In addition, in the current battery installation structure of electric vehicles (the method of assembling modules into the battery box, also known as MTP), the battery pack has about 70 internal parts, and more than 90 standard parts. It is difficult to ensure manufacturing accuracy and sealing, the development cycle is long, and it is even prone to safety problems, which is not conducive to the control of development progress and quality.

[0008] As the range of electric vehicles increases, the weight of the vehicle continues to rise, posing serious challenges in meeting collision safety requirements. For example, the transmission of collision capacity between the front longitudinal beam and the front floor sill beam requires strengthening the structure between the two. However, with traditional sheet metal structures, the underbody of the car will become heavier when achieving such performance.

[0009] The existing patent 201620904047.5 - A car underbody structure does not clearly disclose the technical content for solving the above technical problems.

[0010] Therefore, in order to improve or solve at least one of the above problems, it is urgent to optimize the design of the existing lower vehicle body structure. Utility Model Content

[0011] The purpose of the utility model is to provide an integrated lower vehicle body structure.

[0012] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0013] A lower vehicle body structure comprises an lower vehicle body, wherein the lower vehicle body is formed by integral die casting; the lower vehicle body comprises a battery pack shell, and a front cabin structure and a rear floor structure are respectively provided at both ends of the battery pack shell.

[0014] The end of the lower vehicle body is provided with an insertion interface for plugging in the front longitudinal beam mechanism or the rear longitudinal beam mechanism.

[0015] The lower vehicle body is made of aluminum alloy material.

[0016] An integral vehicle body structure comprises a lower vehicle body structure; a longitudinal beam mechanism is provided at the end of the lower vehicle body structure; the longitudinal beam mechanism comprises a front longitudinal beam mechanism and a rear longitudinal beam mechanism arranged at both ends of the vehicle body structure; the front longitudinal beam mechanism and the rear longitudinal beam mechanism are respectively plugged into the two ends of the lower vehicle body.

[0017] The front longitudinal beam mechanism comprises two front longitudinal beams which are spaced apart and distributed at the end edges of the lower vehicle body; the rear longitudinal beam mechanism comprises two rear longitudinal beams which are spaced apart and distributed at the end edges of the lower vehicle body.

[0018] The rear longitudinal beam comprises a rear longitudinal beam body, and a positioning recessed groove is arranged on one end of the rear longitudinal beam body away from the lower vehicle body.

[0019] The positioning groove is located at the side of the rear longitudinal beam body away from the ground.

[0020] The front longitudinal beam mechanism is connected with a front anti-collision beam; the rear longitudinal beam mechanism is connected with a rear anti-collision beam; the rear anti-collision beam is placed in a positioning recess of the rear longitudinal beam body.

[0021] The front longitudinal beam or the rear longitudinal beam is connected to the lower vehicle body by welding.

[0022] The connection between the front longitudinal beam or the rear longitudinal beam and the lower vehicle body is also penetrated with fixing bolts.

[0023] The advantages of the utility model are:

[0024] The utility model discloses a lower vehicle body structure and an integral vehicle body structure having the lower vehicle body structure.

[0025] The lower vehicle body structure designed by the utility model can be produced by adopting an integrated die-casting process, thereby greatly improving the integrity of the lower vehicle body.

[0026] At the same time, the entire lower body structure of the utility model is made of aluminum alloy, and most of the front cabin, the battery pack shell, and most of the rear floor are integrated through Z-direction demolding.

[0027] At the same time, the lower body structure adopts an integrated die-cast structure, which improves the sealing of the body and greatly reduces the amount of glue used; at the same time, it reduces the welding deformation caused by traditional large-scale sheet metal welding and improves the body size accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The following is a brief description of the contents expressed in each of the drawings of the utility model specification and the marks in the drawings:

[0029] Figure 1 It is a structural schematic diagram of the utility model.

[0030] Figure 2 It is a structural schematic diagram of the utility model when it is connected with a longitudinal beam mechanism.

[0031] Figure 3 It is a partial structural schematic diagram of the utility model when the rear longitudinal beam mechanism is connected to the lower vehicle body.

[0032] Figure 4 It is a partial structural schematic diagram of the utility model when the front longitudinal beam mechanism is connected to the lower vehicle body.

[0033] Figure 5 It is a structural schematic diagram of the integral vehicle body structure in the utility model.

[0034] The marks in the above figure are:

[0035] 1. Get off the vehicle, 11. Battery pack housing, 12. Rear floor structure, 13. Front cabin structure;

[0036] 2. Rear longitudinal beam, 3. Front longitudinal beam, 4. Rear anti-collision beam, 5. Front anti-collision beam. DETAILED DESCRIPTION

[0037] The specific implementation methods of the present utility model will be further explained in detail below by describing the optimal embodiments with reference to the accompanying drawings.

[0038] A lower body structure comprises an lower body 1, wherein the lower body 1 is formed by integral die casting; the lower body 1 comprises a battery pack shell 11, and a front cabin structure 13 and a rear floor structure 12 are respectively provided at both ends of the battery pack shell 11; the lower body structure designed by the utility model can be produced by an integral die casting process, which greatly improves the integrity of the lower body; at the same time, the overall material of the lower body structure of the utility model is aluminum alloy, and most of the front cabin, the battery pack shell 11, and most of the rear floor are integrated through Z-direction demolding; at the same time, the lower body structure adopts an integral die casting structure, which improves the sealing of the vehicle body and greatly reduces the amount of glue used; at the same time, the welding deformation caused by traditional large-scale sheet metal welding is reduced, and the vehicle body size accuracy is improved.

[0039] In the present invention, the lower vehicle body structure mainly includes an lower vehicle body 1, which is formed by integral die-casting, thereby ensuring the integrity of the lower vehicle body 1 and avoiding the problem of welding deformation that is easily generated during welding and assembly after the traditional lower vehicle body 1 is produced in sections.

[0040] In addition, in the utility model, the lower body 1 includes a battery pack shell 11, and a front cabin structure 13 and a rear floor structure 12 are respectively provided at both ends of the battery pack shell 11; in the utility model, the front cabin structure 13 is most of the structure of a traditional front cabin, and the rear floor structure 12 is most of the structure of a traditional rear floor assembly; please refer to the attached drawings for details.

[0041] Furthermore, in the utility model, an insertion interface 14 for plugging in the front longitudinal beam mechanism or the rear longitudinal beam mechanism is provided at the end of the lower vehicle body 1; the utility model facilitates the installation and connection of the front longitudinal beam mechanism or the rear longitudinal beam mechanism on the lower vehicle body 1 through the provision of the insertion interface 14.

[0042] In addition, in the present invention, the insertion interface 14 is mainly arranged at the end of the lower body 1, the insertion interface 14 corresponding to the front longitudinal beam mechanism is mainly arranged at the end of the front cabin structure 13; the insertion interface 14 corresponding to the rear longitudinal beam mechanism is mainly arranged at the end of the rear longitudinal beam mechanism; in addition, in the present invention, the number of insertion interfaces 14 can be selected according to needs.

[0043] Furthermore, in the present invention, the lower vehicle body 1 is made of aluminum alloy material; through such a design, the present invention can not only ensure the overall structural strength of the lower vehicle body, but also facilitate the subsequent die-casting process.

[0044] An integral body structure comprises a lower body structure; a longitudinal beam mechanism is provided at the end of the lower body structure; the longitudinal beam mechanism comprises a front longitudinal beam mechanism and a rear longitudinal beam mechanism arranged at both ends of the body structure; the front longitudinal beam mechanism and the rear longitudinal beam mechanism are respectively plugged into the two ends of the lower body 1; the body structure disclosed in the utility model greatly ensures the integrity of the lower body structure through the integrated design of the lower body structure, thereby ensuring the integrity of the integral body structure.

[0045] At the same time, the essential functions of the front longitudinal beam mechanism and the rear longitudinal beam mechanism are similar to the traditional front longitudinal beam 3 and rear longitudinal beam 2 structures. Specifically, in the utility model, the front longitudinal beam mechanism includes two front longitudinal beams 3 spaced apart at the end edges of the lower vehicle body 1; the rear longitudinal beam mechanism includes two rear longitudinal beams 2 spaced apart at the end edges of the lower vehicle body 1; in the utility model, the lower vehicle body 1 is provided with two front longitudinal beams 3 at the end close to the front end, and the two front longitudinal beams 3 are distributed at the edge of the lower vehicle body 1; at the same time, the lower vehicle body 1 is provided with two rear longitudinal beams 2 at the end close to the rear end, and the two rear longitudinal beams 2 are respectively spaced apart at the edge of the lower vehicle body 1; based on such a configuration, the assembly and forming of the vehicle body chassis is facilitated.

[0046] Furthermore, in the present invention, the rear longitudinal beam 2 includes a rear longitudinal beam body 21, which is the main structure of the rear longitudinal beam 2, and in the present invention, a positioning groove 22 is provided on the end of the rear longitudinal beam body 21 away from the lower body 1; the positioning groove 22 plays a good positioning role, mainly to limit the position of the rear anti-collision beam 4; because for the subsequent collision energy absorption protection, the front longitudinal beam mechanism is required to be connected with the front anti-collision beam 5 in the present invention; the rear longitudinal beam mechanism is connected with the rear anti-collision beam 4; in the present invention, the essential function of the front anti-collision beam 5 and the rear anti-collision beam 4 is equivalent to the traditional anti-collision beam.

[0047] However, the utility model requires that the rear anti-collision beam 4 be placed in the positioning groove 22 of the rear longitudinal beam body 21; such a setting enables a clear installation positioning relationship between the rear anti-collision beam 4 and the rear longitudinal beam 2, which ensures the accuracy and stability of the installation position of the rear anti-collision beam 4 to a certain extent.

[0048] Furthermore, in the utility model, the positioning groove 22 is located on the side of the rear longitudinal beam body 21 away from the ground; based on such a setting, the utility model makes the positioning groove 22 equivalent to being set at the upper edge of the rear longitudinal beam body 21 and at the end of the rear longitudinal beam 2, which makes the end of the rear longitudinal beam body 21 form a stepped platform structure, and the subsequent modified stepped platform can limit the position of the rear anti-collision beam 4, and at the same time can also provide good longitudinal support force for the rear anti-collision beam 4 to prevent the rear anti-collision beam 4 from sinking.

[0049] Furthermore, in the present invention, the front longitudinal beam 3 or the rear longitudinal beam 2 is connected to the lower vehicle body 1 by welding; the connection between the front longitudinal beam 3 or the rear longitudinal beam 2 and the lower vehicle body 1 is also penetrated with a fixing bolt; the present invention ensures the stability of the connection between the front longitudinal beam 3 or the rear longitudinal beam 2 and the lower vehicle body 1 by using welding and screwing.

[0050] specific:

[0051] The utility model discloses a lower vehicle body structure; the utility model can solve the problems of increasing the lightness of the vehicle body, highly integrating the lower vehicle body, improving the material utilization rate and reducing the production cost and management cost.

[0052] The main body of the lower vehicle body structure disclosed by the utility model is made of aluminum alloy to achieve the purpose of lightness.

[0053] At the same time, most of the traditional front cabin assembly, the battery pack shell 11, and most of the rear floor assembly are integrated into aluminum castings, and the front sections of the left and right longitudinal beams of the front cabin and the rear sections of the left and right longitudinal beams of the rear floor assembly are still made of aluminum profiles and welded to the aluminum castings to increase the strength and use bolts to increase the energy absorption effect.

[0054] The lower vehicle body structure disclosed in the utility model is made of aluminum alloy as a whole. Most of the front cabin, the battery pack shell 11, and most of the rear floor are integrated through Z-direction demolding. Longitudinal beam insertion interfaces 14 are left at the front and rear ends of the casting. It has the characteristics of high strength, high manufacturing efficiency, and high material utilization.

[0055] The lower body structure adopts an integrated die-cast structure, which improves the sealing of the body and greatly reduces the amount of glue used; at the same time, it reduces the welding deformation caused by traditional large-scale sheet metal welding and improves the body size accuracy; and the block assembly method is adopted when designing the mold to cope with the changes in wheelbase and achieve platformization.

[0056] The front longitudinal beam 3 and the rear longitudinal beam 2 are respectively connected to the insertion interface 14 reserved by the lower body 1, and the two are connected by welding and screwing. The components at both ends are composed of aluminum extruded profiles. The front end of the left / right longitudinal beam has a collapse structure, which can enhance the energy absorption effect of the front cabin assembly.

[0057] The vehicle body assembly disclosed in the utility model mainly includes an integral die-cast lower body structure, a front anti-collision beam 5, a rear anti-collision beam 4 and a small number of other sheet metal parts, which are connected by welding, screwing and the like, and have the characteristics of high vehicle body lightweight, high component integration, improved material utilization, reduced production costs and high vehicle body rigidity.

[0058] Obviously, the specific implementation of the present invention is not limited by the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, they are all within the protection scope of the present invention.

Claims

1. A lower vehicle body structure, characterized in that: It includes a lower body, which is formed by integral die-casting; the lower body includes a battery pack shell, and a front cabin structure and a rear floor structure are respectively provided at both ends of the battery pack shell; an insertion interface is provided at the end of the lower body for plugging in a front longitudinal beam mechanism or a rear longitudinal beam mechanism.

2. A lower vehicle body structure according to claim 1, characterized in that: The lower vehicle body is made of aluminum alloy material.

3. An integral vehicle body structure, characterized in that: It comprises a lower vehicle body structure as claimed in any one of claims 1 to 2; a longitudinal beam mechanism is provided at the end of the lower vehicle body structure; the longitudinal beam mechanism comprises a front longitudinal beam mechanism and a rear longitudinal beam mechanism arranged at both ends of the vehicle body structure; the front longitudinal beam mechanism and the rear longitudinal beam mechanism are respectively plugged into the two ends of the lower vehicle body.

4. The integral vehicle body structure according to claim 3, characterized in that: The front longitudinal beam mechanism comprises two front longitudinal beams which are spaced apart and distributed at the end edges of the lower vehicle body; the rear longitudinal beam mechanism comprises two rear longitudinal beams which are spaced apart and distributed at the end edges of the lower vehicle body.

5. The integral vehicle body structure according to claim 4, characterized in that: The rear longitudinal beam comprises a rear longitudinal beam body, and a positioning recessed groove is arranged on one end of the rear longitudinal beam body away from the lower vehicle body.

6. The integral vehicle body structure according to claim 5, characterized in that: The positioning groove is located at the side of the rear longitudinal beam body away from the ground.

7. The integral vehicle body structure according to claim 5, characterized in that: The front longitudinal beam mechanism is connected with a front anti-collision beam; the rear longitudinal beam mechanism is connected with a rear anti-collision beam; the rear anti-collision beam is placed in a positioning recess of the rear longitudinal beam body.

8. The integral vehicle body structure according to claim 4, characterized in that: The front longitudinal beam or the rear longitudinal beam is connected to the lower vehicle body by welding.

9. The integral vehicle body structure according to claim 8, characterized in that: The connection between the front longitudinal beam or the rear longitudinal beam and the lower vehicle body is also penetrated with fixing bolts.

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