Rear collision beam welding assembly structure, body-in-white welding assembly and automobile

Abstract

The application relates to the technical field of automobiles, in particular to a rear collision beam welding assembly, a body-in-white welding assembly and an automobile. Left and right ends of a rear anti-collision beam body are respectively provided with a left connecting piece and a right connecting piece. The left connecting piece is used for correspondingly connecting and fixing the rear anti-collision beam body with a left end of a rear part of the body-in-white welding assembly. The right connecting piece is used for correspondingly connecting and fixing the rear anti-collision beam body with a right end of the rear part of the body-in-white welding assembly. A rear anti-collision beam upper support plate is arranged at the rear part of the rear anti-collision beam body. A plurality of reinforcing support blocks for improving the connecting strength between the rear anti-collision beam body and the rear anti-collision beam upper support plate are welded at the corners of the rear anti-collision beam body and the rear anti-collision beam upper support plate. The rear anti-collision beam body is above the rear anti-collision beam upper support plate. A plurality of vertical bolt holes are arranged in the middle part of the rear anti-collision beam body. The rear collision beam and the automobile body connection strength problem can be solved.

Description

Technical Field

[0001] This invention relates to the field of automotive technology, and more specifically, to a rear collision beam welding assembly structure, a body-in-white welding assembly, and an automobile. Background Technology

[0002] As the global automotive market increasingly prioritizes both safety and cost control, automakers face the challenge of reducing costs while ensuring passenger safety. The rear-impact beam, as a critical safety structural component, plays a vital role in protecting occupants. Traditionally, to enhance passenger protection, rear-impact beams typically utilize thicker steel plates, formed into specific cross-sectional structures through stamping or rolling processes to increase strength. However, this design approach leads to a significant increase in cost, particularly during mold development, as each specific structure requires customized molds, making it difficult to achieve an ideal balance between cost and practical safety.

[0003] In existing automotive designs, rear-end collision protection structures typically include a crossbeam and connectors that link to the rear longitudinal beams of the vehicle body. While different car models may vary in shape, size, and material selection, their basic function and design philosophy remain consistent: to install a crossbeam inside the bumper to provide protection in the event of a rear-end collision. However, existing technologies have several key limitations:

[0004] 1. High manufacturing cost: Since the rear collision beam is usually made of stamped and welded parts or a combination of rolled and stamped parts, this manufacturing process requires highly customized full-process tooling (a mold system including multiple processes), which increases the overall production cost.

[0005] 2. Insufficient connection strength: The current rear collision beam only connects to the vehicle's longitudinal beams on both sides, without a corresponding mounting point in the middle, resulting in insufficient stiffness in the vertical direction (z-axis). This means that in a rear-end collision, the beam may not be able to effectively transmit the impact force, thus affecting the protection of the occupants.

[0006] In summary, the design of existing rear-collision crossbeams faces the challenge of ensuring safety performance while controlling costs, especially in striking a balance between structural complexity and cost optimization. This background information reveals an important research direction in the field of automotive design: finding innovative methods to improve the design of rear-collision crossbeams to simultaneously meet the needs of safety and economy. Summary of the Invention

[0007] The purpose of this invention is to provide a rear collision beam welded assembly structure, which can at least solve the problem of insufficient connection strength between the rear collision beam and the vehicle body.

[0008] Another objective of this invention is to provide a white body welding assembly that can at least solve the problem of insufficient connection strength between the rear collision beam and the body.

[0009] Another object of the present invention is to provide an automobile that can at least solve the problem of insufficient connection strength between the rear collision beam and the vehicle body.

[0010] The technical solution of this invention is implemented as follows:

[0011] A rear collision beam welded assembly structure is used to install at the rear of the automotive body-in-white welded assembly, including a rear anti-collision beam body, a rear anti-collision beam upper support plate, a reinforcing support block, a left connector and a right connector;

[0012] The rear anti-collision beam body is provided with a left connector and a right connector at its left and right ends, respectively. The left connector is used to connect and fix the rear anti-collision beam body to the left end of the rear of the body-in-white welded assembly, and the right connector is used to connect and fix the rear anti-collision beam body to the right end of the rear of the body-in-white welded assembly.

[0013] The rear part of the rear anti-collision beam body is provided with the upper support plate of the rear anti-collision beam, and a plurality of reinforcing support blocks are welded at the corner of the rear anti-collision beam body and the upper support plate of the rear anti-collision beam to improve the connection strength therebetween. The rear anti-collision step plate is installed together on the rear anti-collision beam body and the upper support plate of the rear anti-collision beam.

[0014] The rear anti-collision beam body has several vertical bolt holes in the middle for installing vertical connecting bolts to be connected and fixed to the middle of the rear of the body-in-white welded assembly.

[0015] Furthermore, the left connector and the right connector are respectively provided with locking bolt holes, and locking bolts are installed in the locking bolt holes.

[0016] Furthermore, the left connector and the right connector are respectively provided with pre-tightening bolt holes, and the locking bolt holes are used to install pre-tightening bolts.

[0017] Furthermore, the rear anti-collision beam body is formed by molding a rectangular tube and then laser cutting it.

[0018] Furthermore, the support plate on the rear anti-collision beam is formed by laser cutting and welded to the body of the rear anti-collision beam to support the rear bumper step.

[0019] Furthermore, the left connecting piece is formed by stamping and welded to the rear anti-collision beam body;

[0020] The right connector is formed by stamping and welded to the rectangular tube rear anti-collision beam body.

[0021] Furthermore, it also includes a rear bumper mounting bracket, which is formed by stamping and welded to the rectangular tube rear bumper beam body for snap-fit ​​installation of the rear bumper.

[0022] Furthermore, it also includes a flat-head hexagonal rivet nut, which is formed by stamping and welded to the rectangular tube rear anti-collision beam body for the installation of the rear bumper step plate.

[0023] A body-in-white welding assembly includes the aforementioned rear collision beam welding assembly structure, which is connected and fixed to the rear of the body-in-white welding assembly via the left connector and the right connector.

[0024] An automobile, including the aforementioned body-in-white welded assembly.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] This application provides a rear collision beam welded assembly structure. Based on the rear anti-collision beam body, a new design of a support plate on the rear anti-collision beam is added. Multiple reinforcing support blocks are welded at the corner of the rear anti-collision beam body and the support plate on the rear anti-collision beam. The multiple reinforcing support blocks are arranged sequentially along the rear collision beam to improve the connection strength between them. It also facilitates the subsequent installation of the rear safety step plate and improves the support strength, thereby improving the safety of people stepping on the rear safety step plate.

[0027] This application not only establishes a secure connection between the left and right sides and the rear of the body-in-white welded assembly via the left and right connecting parts, but also allows for the installation of several vertical connecting bolts in the middle to connect and fix the middle of the rear of the body-in-white welded assembly, thereby improving the vertical (i.e., z-direction) connection strength of the middle section. At the same time, it provides several mounting points in the middle of the rear collision beam welded assembly structure (the number of mounting points is determined by the number of vertical connecting bolts), thereby improving its rigidity. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a structural schematic diagram of the rear collision beam welding assembly structure of the present invention;

[0030] Figure 2This is a schematic diagram of the rear collision beam welding assembly structure of the present invention installed at the rear of the body-in-white welding assembly;

[0031] Figure 3 This invention is for Figure 2 Axonometric drawing at an upward viewing angle;

[0032] Figure 4 This is a schematic diagram of the connector of the present invention.

[0033] In the picture:

[0034] 1- Rear bumper beam body; 2- Support plate on the rear bumper beam; 3- Reinforcing support block;

[0035] 4-Left connector; 5-Right connector;

[0036] 401 - Connecting plate body; 402 - Upper connecting part; 403 - Lower connecting part;

[0037] 404 - Left connecting part; 405 - Right connecting part; 406 - Preload bolt hole; 407 - Locking bolt hole;

[0038] 6-Rear shield mounting bracket; 7-Flat head hexagonal rivet nut;

[0039] 8-Locking bolt; 9-Preload bolt; 10-Vertical connecting bolt; 11-Support block;

[0040] 12 - Rear of the welded assembly of the body-in-white. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0043] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0044] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0045] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0046] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0047] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0048] Example 1

[0049] This embodiment provides a rear collision beam welded assembly structure for installation at the rear 12 of the automotive body-in-white welded assembly. Simply put, it is an important component located at the rear of the vehicle to enhance its safety performance in the event of a rear-end collision. The main feature of this structure is that it is welded from various different parts, aiming to improve vehicle safety and reduce manufacturing costs.

[0050] Note: Body-in-white refers to the body that has been welded but not yet painted. The painted body-in-white, along with the interior and exterior trim (including the dashboard, seats, windshield, carpets, interior trim panels, etc.), the electronic and electrical systems (audio, wiring harnesses, switches, etc.), the chassis system (including braking and suspension systems, etc.), and the powertrain system (including the engine, transmission, etc.), constitutes the complete vehicle.

[0051] Reference Figures 1-4Specifically: the rear collision beam welded assembly structure includes: the rear anti-collision beam body 1, the rear anti-collision beam upper support plate 2, the reinforcing support block 3, the left connecting piece 4 and the right connecting piece 5;

[0052] The rear anti-collision beam body 1 is provided with a left connector 4 and a right connector 5 at its left and right ends, respectively. The left connector 4 is used to connect and fix the rear anti-collision beam body 1 to the left end of the rear panel assembly, and the right connector 5 is used to connect and fix the rear anti-collision beam body 1 to the right end of the rear panel assembly. Multiple reinforcing support blocks 3 are arranged sequentially along the rear collision beam to improve the connection strength between them, and also to facilitate the subsequent installation of the rear safety step plate and improve the support strength, thereby improving the safety of people stepping on the rear safety step plate.

[0053] In this preferred embodiment, the left connecting member 4 and the right connecting member 5 have the same structure and are collectively referred to as connecting members. The two connecting members (i.e., left connecting member 4 and right connecting member 5) are respectively located at the left and right ends of the front side of the rear anti-collision beam body 1. The specific structure of the connecting members is as follows:

[0054] Reference Figure 4 The connector includes a connecting plate body 401. The connecting plate body 401 has an upper connecting portion 402 at its top and a lower connecting portion 403 at its bottom. A left connecting portion 404 and a right connecting portion 405 are respectively provided on the left and right sides of the connecting plate body 401. The upper connecting portion 402, lower connecting portion 403, left connecting portion 404, and right connecting portion 405 are located on the same side of the connecting plate body 401, and the connector is an integrally formed structure. Specifically, the upper connecting portion 402 of the connector is fastened to the top of the rear bumper beam body 1 and welded thereto; the lower connecting portion 403 of the connector is fastened to the bottom of the rear bumper beam body 1; and the left connecting portion 404 and right connecting portion 405 are respectively abutted against or attached to the front side of the rear bumper beam body 1 and welded thereto.

[0055] The connecting plate body 401 of the connector has a locking bolt hole 407 along the y direction (i.e. along the front and rear direction of the body-in-white). There is at least one locking bolt hole 407. The locking bolt hole 407 is used to install a locking bolt 8 to be bolted and fixed to the rear part 12 of the body-in-white welding assembly.

[0056] The left connecting piece 4 is formed by stamping and welded to the rear anti-collision beam body 1, so as to satisfy the requirement that the rear collision beam is installed on the body-in-white welding assembly and ensure the rigidity and strength of the rear collision beam itself relative to the body-in-white.

[0057] The right connecting piece 5 is formed by stamping and welded to the rectangular tube rear anti-collision beam body 1, so as to satisfy the requirement that the rear collision crossbeam is installed on the white body welding assembly and ensure the rigidity and strength of the rear collision crossbeam itself relative to the white body.

[0058] The connector may also have a pre-tightening bolt hole 406 along the y-direction. A pre-tightening bolt 9 can be installed in the locking bolt hole 407, meaning that the pre-tightening bolt 9 can be installed before the locking bolt 8 to achieve a pre-tightening effect. The main function of the pre-tightening bolt 9 (also called a pre-tightening bolt or tension bolt) is to provide an initial, constant tensile force in the mechanical structure (i.e., when the rear bumper beam body 1 is connected to the welded assembly of the body-in-white), thereby ensuring tight contact and stability between them. This design is crucial for the fastening of the connection, especially since it needs to withstand high stress and vibration. The following are some specific functions of the pre-tightening bolt 9 in this embodiment:

[0059] 1. Improve connection strength: By applying a pre-tension force, the pre-tightening bolt 9 can ensure that the rear anti-collision beam body 1 and the white body welded assembly are in close contact, reducing loosening caused by external force or vibration.

[0060] 2. Preventing loosening: Under dynamic loads, the preload can counteract some of the loosening tendency caused by external loads, thereby maintaining the safety of the connection.

[0061] 3. Uniform load distribution: Preloaded bolts 9 help to distribute the load more evenly on the connection surface, avoiding excessive local stress that could lead to material fatigue or damage.

[0062] 4. Improved durability: By maintaining a constant preload, metal fatigue can be mitigated to some extent, extending the service life of mechanical parts.

[0063] 5. Impact and vibration resistance: Preloaded bolts 9 can increase the structure's resistance to impact and vibration, which is especially important for automobile manufacturing (body structure).

[0064] In summary, this solution enhances the stability and reliability of the rear anti-collision beam body 1 by applying a pre-set tension when installing it onto the welded assembly of the body-in-white using pre-tightening bolts 9, and then locks it with locking bolts 8 to improve the connection strength and rigidity.

[0065] The rear of the rear anti-collision beam body 1 is provided with the rear anti-collision beam upper support plate 2, and multiple reinforcing support blocks 3 are welded at the corner of the rear anti-collision beam body 1 and the rear anti-collision beam upper support plate 2 to improve the connection strength between them. The rear anti-collision beam body 1 and the rear anti-collision beam upper support plate 2 are used to jointly install the rear protection step plate. The multiple reinforcing support blocks 3 act as reinforcing ribs and are arranged sequentially along the rear collision beam to improve the connection strength between them. They also facilitate the subsequent installation of the rear protection step plate and improve the support strength, thereby improving the safety of people stepping on the rear protection step plate and ensuring that people can step on it safely.

[0066] The rear anti-collision beam body 1 has several vertical bolt holes in the middle for installing vertical connecting bolts 10 to be connected and fixed to the middle of the rear panel assembly. Specifically, multiple support blocks 11 are fixedly installed in the middle of the rear of the body-in-white welded assembly. The multiple support blocks 11 jointly support the rear anti-collision beam body, and each support block 11 corresponds to at least two vertical bolt holes.

[0067] Preferably, two symmetrically arranged support blocks 11 are provided in the middle of the rear of the welded assembly of the body-in-white, promoting balance. Each support block 11 corresponds to two vertical bolt holes, which are located at opposite ends of the support block 11. Multiple support blocks 11 collectively support the rear collision beam body, and vertical connecting bolts 10 are installed in each vertical bolt hole to fasten the rear collision beam body to the support block 11. The design of multiple vertical connecting bolts 10 improves the vertical (i.e., z-direction) connection strength of the middle of the rear collision beam welded assembly structure, while also providing multiple mounting points in the middle of the rear collision beam welded assembly structure, thus improving its rigidity.

[0068] It should be noted that the rear anti-collision beam body 1 is a rectangular tube formed by sequential molding and laser cutting. Molding saves tooling costs and meets the rigidity requirements. The bottom of the rectangular tube is provided with the vertical bolt holes.

[0069] In this embodiment, the top surface of the support plate on the rear collision beam is flush with the top surface of the rear collision beam body so as to jointly support and meet the support requirements of the rear anti-collision step plate. The support plate 2 on the rear anti-collision beam is formed by laser cutting, which saves tooling costs and meets the rigidity requirements.

[0070] The rear bumper beam welded assembly structure also includes a rear bumper mounting bracket 6 and a flat-head hexagonal rivet nut 7. The rear bumper mounting bracket 6 is formed by stamping and welded to the rectangular tube rear bumper beam body 1, and is used for the snap-fit ​​installation of the rear bumper. The flat-head hexagonal rivet nut 7 is formed by stamping and welded to the rectangular tube rear bumper beam body 1, and is used for the installation of the rear bumper step plate.

[0071] The rear collision beam welded assembly structure utilizes a welding robot for all welding operations, ensuring consistency in mass production of components. Overall, the rear collision beam welded assembly structure reduces investment while guaranteeing usability and collision safety. Its unique design strikes a balance between cost and practicality, meeting market demands for both automotive safety and cost control. The welded collision beam assembly boasts high rigidity, with the rear collision beam forming a sealed, continuous cross-section to guarantee strength.

[0072] Example 2

[0073] A body-in-white welding assembly includes the aforementioned rear collision crossbeam welding assembly structure, which is connected and fixed to the rear part 12 of the body-in-white welding assembly via the left connecting member 4 and the right connecting member 5. The left connecting member 4 and the right connecting member 5 are respectively provided with pre-tightening bolt holes 406 and locking bolt holes 407, and bolted connections are established with the rear part 12 of the body-in-white welding assembly by installing pre-tightening bolts 9 and locking bolts 8 (as described above, without further elaboration).

[0074] Example 3

[0075] An automobile, including the aforementioned body-in-white welded assembly (body-in-white).

[0076] The beneficial effects of the technical solution of the present invention are:

[0077] Traditional rear collision beams typically require more manufacturing processes and tools, while the new design presented in this application reduces costs by minimizing tooling and utilizes laser cutting technology to flexibly adjust the mounting point position. This not only lowers production costs but also improves product quality and consistency. This structure, welded to the vehicle body, effectively absorbs and disperses collision forces, thereby mitigating the impact on the passenger compartment and enhancing passenger safety. Simultaneously, it supports the installation of the rear bumper wiring harness (for connecting electrical equipment at the rear of the vehicle), rear bumper trim (decorative elements at the rear of the vehicle), and the tailgate step (i.e., the rear bumper step plate, the part for passengers to step on when getting in and out of the vehicle), ensuring the stability and functionality of these components.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

[0079] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A rear crash beam welding assembly structure for mounting at the rear portion (12) of a vehicle body in white welding assembly, characterized in that, It comprises rear anti-collision beam body (1), rear anti-collision beam upper support plate (2), reinforcing support block (3), left connecting piece (4) and right connecting piece (5). The left connecting piece (4) and the right connecting piece (5) are respectively arranged on the left and right ends of the rear anti-collision beam body (1), the left connecting piece (4) is used for connecting and fixing the rear anti-collision beam body (1) with the left end of the rear part of the white body welding assembly, and the right connecting piece (5) is used for connecting and fixing the rear anti-collision beam body (1) with the right end of the rear part of the white body welding assembly. The rear part of the rear anti-collision beam body (1) is provided with the rear anti-collision beam upper support plate (2), and a plurality of reinforcing support blocks (3) for improving the connecting strength between the rear anti-collision beam body (1) and the rear anti-collision beam upper support plate (2) are welded at the corners of the rear anti-collision beam body (1) and the rear anti-collision beam upper support plate (2), and the rear anti-collision beam body (1) and the rear anti-collision beam upper support plate (2) are used for jointly installing the rear bumper step plate. The middle part of the rear anti-collision beam body (1) is provided with a plurality of vertical bolt holes for installing vertical connecting bolts (10) to correspondingly connect and fix the middle part of the rear part of the white body welding assembly.

2. The rear impact beam weld assembly structure of claim 1, wherein, Locking bolt holes (407) are respectively arranged on the left connecting piece (4) and the right connecting piece (5), and locking bolts (8) are arranged in the locking bolt holes (407).

3. The rear impact beam weld assembly structure of claim 2, wherein, Pre-tightening bolt holes (406) are respectively arranged on the left connecting piece (4) and the right connecting piece (5), and pre-tightening bolts (9) are arranged in the pre-tightening bolt holes (406).

4. The rear impact beam weld assembly structure of claim 1, wherein, The rear anti-collision beam body (1) is a rectangular tube formed by die forming, and is formed by laser cutting.

5. The rear impact beam weld assembly structure of claim 1, wherein, The rear anti-collision beam upper support plate (2) is formed by laser cutting and is welded on the rear anti-collision beam body (1) to satisfy the support of the rear bumper step plate.

6. The rear impact beam weld assembly structure of claim 1, wherein, The left connecting piece (4) is formed by stamping and is welded on the rear anti-collision beam body (1); The right connecting piece (5) is formed by stamping and is welded on the rectangular tube rear anti-collision beam body (1).

7. The rear impact beam weld assembly structure of claim 1, wherein, It also comprises rear bumper mounting bracket (6) which is formed by stamping and is welded on the rectangular tube rear anti-collision beam body (1) and is used for buckling installation of the rear bumper.

8. The rear impact beam weld assembly structure of claim 1, wherein, It also comprises flat head hexagonal rivet nut (7) which is formed by stamping and is welded on the rectangular tube rear anti-collision beam body (1) and is used for installation of the rear bumper step plate.

9. A body-in-white welding assembly, characterized by, It comprises the rear collision beam welding assembly structure of any one of claims 1-8, which is connected and fixed to the rear part (12) of the white body welding assembly through the left connecting piece (4) and the right connecting piece (5).

10. An automobile characterized by comprising: It comprises the white body welding assembly of claim 9.

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