Structure for improving rigidity performance of rear suspension mounting point of rear longitudinal beam of automobile body

Abstract

The invention belongs to the technical field of automobile body rear longitudinal beams, and discloses a structure for improving the rigidity performance of a rear suspension mounting point of an automobile body rear longitudinal beam. A rear longitudinal beam inner reinforcing plate (16) is arranged in the rear longitudinal beam (12), a rear auxiliary frame rear fixing support (19) is arranged between the rear longitudinal beam (12) and the rear longitudinal beam inner reinforcing plate (14), an auxiliary frame rear fixing nut (17) penetrates through the rear longitudinal beam (12), the auxiliary frame rear fixing support (19) and the rear longitudinal beam inner reinforcing plate (16), and the penetrating portion of the auxiliary frame rear fixing nut (17) is a rear auxiliary frame rear installation point (10). The rear longitudinal beam (12), the rear longitudinal beam inner reinforcing plate (16) and the rear suspension spring fixing seat (14) are fixedly connected, and the position of the rear suspension spring fixing seat (14) is a rear spring installation point (9). The structure for improving the rigidity performance of the rear suspension mounting point of the rear longitudinal beam of the automobile body is simple in structure, and the rigidity performance of the rear suspension mounting point of the rear longitudinal beam of the automobile body is effectively improved through local structure optimization, so that the purpose of improving the performance of the whole automobile is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of the rear longitudinal beam of an automobile, and more specifically, relates to a structure for improving the stiffness performance of the rear suspension mounting point of the rear longitudinal beam of an automobile. Background Art

[0002] The road surface load is transmitted into the rear suspension of the automobile through the tire. A part of the load of the rear suspension is transmitted to the vehicle body through the mounting points on the vehicle body side of the rear subframe, and another part of the load is transmitted to the vehicle body through the fixing points of the rear suspension spring on the vehicle body. Considering the diversity of the road surface load and the actual vehicle conditions, the forces on the mounting points on the vehicle body side of the rear suspension are complex and random. Therefore, the structures of the accessories at each mounting point on the vehicle body side of the rear suspension should have high stiffness and strength mechanical properties to meet the handling stability and NVH level of the whole vehicle. The defects of the existing technology are as follows: Defect 1: The rear mounting point 10 of the rear subframe itself forms a cavity in space through the rear fixing nut 17 of the subframe, but due to the too large span of the left rear fixing plate of the rear subframe on the right side of the rear mounting point 10 of the rear subframe, an effective closed space structure cannot be formed; Defect 2: The rear spring mounting point 9 is directly arranged at the midpoint of the left rear fixing plate of the rear subframe. The designed span itself is large. For the left rear fixing plate of the rear subframe, the rear spring mounting point 9 is arranged at the midpoint of a simply supported beam. It can be known from theoretical mechanics that a similar structure cannot provide sufficient stiffness. Based on the above theoretical analysis, CAE simulation means are used for verification, mainly verifying the dynamic stiffness of the rear spring mounting point and the rear mounting point of the rear subframe. The level of dynamic stiffness can directly reflect the ability of this point to resist dynamic loads. The analysis results are shown in Figure 7 , and the analysis results further confirm that the existing technology cannot meet the high stiffness performance requirements.

[0003] In the prior art, there is a technology with the name of "an integrated vehicle body subframe" and the publication (announcement) number of "CN116946255A". This technology relates to the field of subframes of new energy vehicles and discloses an integrated vehicle body subframe, which is composed of a left longitudinal beam (1), a right longitudinal beam (2), and a rear cross beam (3) connecting the left longitudinal beam (1) and the right longitudinal beam (2). The rear end of the left longitudinal beam (1) is fixedly connected with a left middle tower (4), and the rear end of the right longitudinal beam (2) is fixedly connected with a right middle tower (5). It also includes a suspension bracket (6), and the suspension bracket (6) is fixedly connected with the rear cross beam (3) and the left longitudinal beam (1); mounting holes one (7) for fixing the stabilizer bar are provided on the front end faces of both the left longitudinal beam (1) and the right longitudinal beam (2), and mounting sleeves (8) for fixedly mounting the subframe on the vehicle body are provided on the upper end faces of both the left longitudinal beam (1) and the right longitudinal beam (2). This subframe has the advantages of high strength, light weight, long service life, etc. However, this technology does not involve the technical problems and technical solutions of the present application. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: aiming at the deficiencies of the prior art, to provide a structure with simple structure, which can effectively improve the stiffness performance of the rear suspension mounting point of the vehicle body rear longitudinal beam through local structure optimization, so as to achieve the purpose of improving the overall vehicle performance and improve the stiffness performance of the rear suspension mounting point of the vehicle body rear longitudinal beam.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0006] The present invention relates to a structure for improving the stiffness performance of the rear suspension mounting point of a vehicle body rear longitudinal beam. A rear longitudinal beam inner reinforcing plate is arranged inside the rear longitudinal beam. A rear subframe rear fixing bracket is arranged between the rear longitudinal beam and the rear longitudinal beam inner reinforcing plate. A rear subframe fixing nut penetrates through the rear longitudinal beam, the rear subframe rear fixing bracket and the rear longitudinal beam inner reinforcing plate. The penetrating part of the rear subframe fixing nut is the rear subframe rear mounting point. The rear longitudinal beam, the rear longitudinal beam inner reinforcing plate and the rear suspension spring fixing seat are fixedly connected. The position of the rear suspension spring fixing seat is the rear spring mounting point.

[0007] The said rear longitudinal beam is arranged on the vehicle body floor.

[0008] The vehicle body floor is connected with a rear subframe body, the vehicle body floor is connected with a rear coil spring, and the rear coil spring is connected with a rear lower control arm.

[0009] The vehicle body floor is connected with a rear shock absorber, and the rear shock absorber is connected with a rear lower control arm.

[0010] The said rear longitudinal beam includes a left rear longitudinal beam and a right rear longitudinal beam, and the left rear longitudinal beam and the right rear longitudinal beam are respectively connected to the vehicle floor.

[0011] The said rear longitudinal beam is also provided with a front subframe fixing nut.

[0012] The structure for improving the stiffness performance of the rear suspension mounting point of the vehicle body rear longitudinal beam further includes a rear tie rod and a rear trailing arm.

[0013] The left side of the rear part of the said rear subframe body is fixedly connected to the rear subframe rear mounting point of the left rear longitudinal beam through a rear subframe fixing bolt; the right side of the rear part of the rear subframe body is fixedly connected to the rear subframe rear mounting point of the right rear longitudinal beam through a rear subframe fixing bolt.

[0014] The left side of the front part of the said rear subframe body is fixedly connected to the front subframe rear mounting point of the left rear longitudinal beam through a front subframe fixing bolt; the right side of the front part of the rear subframe body is fixedly connected to the front subframe rear mounting point of the right rear longitudinal beam through a front subframe fixing bolt.

[0015] Adopting the technical solution of the present invention, the working principle and beneficial effects are as follows:

[0016] The structure for improving the stiffness performance of the rear suspension mounting points of the vehicle body's rear longitudinal beam in the present invention, when setting up the structure, improves the local structure of the positions of the rear mounting points of the rear subframe and the rear spring mounting points. Specifically, firstly, when arranging the rear mounting points of the rear subframe, a rear fixed bracket for the rear subframe is added between the rear longitudinal beam and the inner reinforcement plate of the rear longitudinal beam, and finally, a closed cavity is formed by passing through the rear fixed nut of the subframe. After connecting the rear subframe body, it maximizes the stiffness. Secondly, when arranging the rear spring mounting points, a three-layer plate is formed by connecting the rear longitudinal beam, the inner reinforcement plate of the rear longitudinal beam, and the rear suspension spring fixing seat. The rear spring mounting points are directly arranged at the position of the three-layer plate, avoiding the situation of a simply supported beam. Based on the above structure, CAE simulation means are used for verification, mainly verifying the dynamic stiffness of the rear spring mounting points and the rear mounting points of the rear subframe. The level of dynamic stiffness can directly reflect the ability of this point to resist dynamic loads. By comparing with the structure of the prior art, it can be seen that the optimized structure significantly improves the rear spring mounting points and the rear mounting points of the rear subframe. The structure for improving the stiffness performance of the rear suspension mounting points of the vehicle body's rear longitudinal beam in the present invention has a simple structure. Through local structure optimization, it effectively improves the stiffness performance of the rear suspension mounting points of the vehicle body's rear longitudinal beam, thereby achieving the purpose of improving the overall vehicle performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following briefly describes the content expressed in each drawing of this specification and the marks in the drawings:

[0018] Figure 1 It is a schematic structural diagram of the structure for improving the stiffness performance of the rear suspension mounting points of the vehicle body's rear longitudinal beam in the present invention;

[0019] Figure 2 It is a schematic structural diagram of the local structure for improving the stiffness performance of the rear suspension mounting points of the vehicle body's rear longitudinal beam in the present invention;

[0020] Figure 3 For Figure 2 It is a schematic structural diagram of the locally enlarged structure of part A for improving the stiffness performance of the rear suspension mounting points of the vehicle body's rear longitudinal beam;

[0021] Figure 4 It is a schematic diagram of the verification data of the structure for improving the stiffness performance of the rear suspension mounting points of the vehicle body's rear longitudinal beam in the present invention;

[0022] Figure 5 It is a schematic diagram of the verification data of the structure for improving the stiffness performance of the rear suspension mounting points of the vehicle body's rear longitudinal beam in the present invention;

[0023] Figure 6 It is a schematic diagram of the verification data of the structure for improving the stiffness performance of the rear suspension mounting points of the vehicle body's rear longitudinal beam in the present invention;

[0024] Figure 7Schematic diagram of verification data for the structure in the prior art;

[0025] The labels in the drawings are respectively: 1 - Rear subframe body, 2 - Rear coil spring, 3 - Rear lower control arm, 4 - Rear tie rod, 5 - Rear trailing arm, 6 - Front mounting point of the rear subframe, 7 - Rear upper control arm, 8 - Rear shock absorber, 9 - Rear spring mounting point, 10 - Rear mounting point of the rear subframe, 11 - Body floor, 12 - Rear longitudinal beam, 14 - Rear suspension spring fixing seat, 15 - Left front fixing plate of the rear subframe, 16 - Inner reinforcement plate of the rear longitudinal beam, 17 - Rear fixing nut of the subframe, 18 - Front fixing nut of the subframe, 19 - Rear fixing bracket of the rear subframe, 20 - Left rear longitudinal beam, 21 - Right rear longitudinal beam. Detailed implementation manners

[0026] The following is a further detailed description of the specific implementation manners of the present invention, such as the shapes, structures of the components involved, the mutual positions and connection relationships between the various parts, the functions of the various parts, and the working principles, etc., with reference to the drawings and through the description of the embodiments:

[0027] As shown in the attached Figure 1 - attached Figure 6 drawing, the present invention is a structure for improving the stiffness performance of the rear suspension mounting point of the rear longitudinal beam of an automobile. An inner reinforcement plate 16 of the rear longitudinal beam is provided inside the rear longitudinal beam 12. A rear fixing bracket 19 of the rear subframe is provided between the rear longitudinal beam 12 and the inner reinforcement plate 14 of the rear longitudinal beam. The rear fixing nut 17 of the subframe penetrates through the rear longitudinal beam 12, the rear fixing bracket 19 of the rear subframe, and the inner reinforcement plate 16 of the rear longitudinal beam. The penetrated part of the rear fixing nut 17 of the subframe is the rear mounting point 10 of the rear subframe. The rear longitudinal beam 12, the inner reinforcement plate 16 of the rear longitudinal beam, and the rear suspension spring fixing seat 14 are fixedly connected. The position of the rear suspension spring fixing seat 14 is the rear spring mounting point 9. For the deficiencies in the prior art, the above structure proposes an improved technical solution. When setting the structure, the local structures of the positions of the rear mounting point 10 of the rear subframe and the rear spring mounting point 9 are improved. Specifically, firstly, when arranging the rear mounting point 10 of the rear subframe, a rear fixing bracket 19 of the rear subframe is added between the rear longitudinal beam 12 and the inner reinforcement plate 16 of the rear longitudinal beam. Finally, a closed cavity is formed by penetrating the rear fixing nut 17 of the subframe. After connecting the rear subframe body 1, the purpose of maximizing the stiffness is achieved, and the overall performance of the vehicle body is improved. Secondly, when arranging the rear spring mounting point 9, a three-layer plate is formed by connecting the rear longitudinal beam 12, the inner reinforcement plate 16 of the rear longitudinal beam, and the rear suspension spring fixing seat 14. The rear spring mounting point 9 is directly arranged at the position of the three-layer plate, avoiding the situation of a simply supported beam and simplifying the structure. Based on the above structure, CAE simulation means are used for verification, mainly verifying the dynamic stiffness of the rear spring mounting point 9 and the rear mounting point 10 of the rear subframe. The level of dynamic stiffness can directly reflect the ability of this point to resist dynamic loads. The analysis results are as shown in the attached Figure 6As shown, by comparing with the structure of the prior art, it can be seen that the optimized structure has obvious improvement in the rear spring mounting point 9 and the rear mounting point 10 of the rear subframe. The structure for improving the stiffness performance of the rear suspension mounting point of the vehicle body longitudinal beam in the present invention is simple. Through local structure optimization, the stiffness performance of the rear suspension mounting point of the vehicle body longitudinal beam is effectively improved, so as to achieve the purpose of improving the overall vehicle performance.

[0028] The longitudinal beam 12 is arranged on the vehicle body floor 11. The longitudinal beam 12 includes a left rear longitudinal beam 20 and a right rear longitudinal beam 21, and the left rear longitudinal beam 20 and the right rear longitudinal beam 21 are respectively connected to the vehicle floor 11. In the above structure, the left rear longitudinal beam 20 and the right rear longitudinal beam 21 are symmetrically arranged, and relevant components are arranged and connected based on the vehicle floor, the left rear longitudinal beam 20 and the right rear longitudinal beam 21.

[0029] The rear subframe body 1 is connected to the vehicle body floor 11, the rear coil spring 2 is connected to the vehicle body floor 11, and the rear coil spring 2 is connected to the rear lower control arm 3. The rear shock absorber 8 is connected to the vehicle body floor 11, and the rear shock absorber 8 is connected to the rear lower control arm 3. A front subframe fixing nut 18 is also provided on the longitudinal beam 12. The structure also includes a rear tie rod 4 and a rear trailing arm 5.

[0030] The left rear side of the rear part of the rear subframe body 1 is fixedly connected to the rear subframe rear mounting point 10 of the left rear longitudinal beam 20 through a rear subframe fixing bolt 17; the right rear side of the rear part of the rear subframe body 1 is fixedly connected to the rear subframe rear mounting point 10 of the right rear longitudinal beam 21 through a rear subframe fixing bolt 17. The left front side of the front part of the rear subframe body 1 is fixedly connected to the front subframe rear mounting point 6 of the left rear longitudinal beam 20 through a front subframe fixing bolt 18; the right front side of the front part of the rear subframe body 1 is fixedly connected to the front subframe rear mounting point 6 of the right rear longitudinal beam 21 through a front subframe fixing bolt 18. In the above structure, the left rear longitudinal beam 20 and the right rear longitudinal beam 21 are symmetrically arranged, and the relevant structures and relevant components provided on the left rear longitudinal beam 20 and the right rear longitudinal beam 21 are also symmetrically arranged.

[0031] The structure of the present invention for improving the stiffness performance of the rear suspension mounting point of the rear longitudinal beam of the automobile body is improved in the local structure of the position of the rear mounting point 10 of the rear subframe and the rear spring mounting point 9 when the structure is set. Specifically, firstly, when the rear mounting point 10 of the rear subframe is arranged, a rear subframe rear fixing bracket 19 is added between the rear longitudinal beam 12 and the inner reinforcement plate 16 of the rear longitudinal beam, and finally a closed cavity is formed by penetrating the rear fixing nut 17 of the subframe. After connecting the rear subframe body 1, the stiffness is maximized; secondly, when the rear spring mounting point 9 is arranged, the rear longitudinal beam 12, the inner reinforcement plate 16 of the rear longitudinal beam, and the rear suspension spring fixing seat 14 are connected to form a three-layer plate, and the rear spring mounting point 9 is directly arranged at the position of the three-layer plate to avoid the situation of a simply supported beam. Based on the above structure, CAE simulation is used for verification, mainly to verify the dynamic stiffness of the rear spring mounting point 9 and the rear subframe rear mounting point 10. The level of dynamic stiffness can directly reflect the ability of this point to resist dynamic loads. The analysis results are shown in the attached figure. Figure 6 As shown, by comparing with the structure of the prior art, it can be seen that the optimized structure has a significant improvement on the rear spring mounting point 9 and the rear subframe rear mounting point 10. The structure for improving the stiffness performance of the rear longitudinal beam rear overhang mounting point of the automobile body of the present invention has a simple structure and effectively improves the stiffness performance of the rear longitudinal beam rear overhang mounting point of the automobile body through local structural optimization, thereby achieving the purpose of improving the performance of the entire vehicle.

[0032] In summary, the present invention optimizes the basic structure, and the new structure avoids the two-point defects of the basic structure, achieving the purpose of improving the stiffness of the rear spring mounting point 9 and the rear subframe rear mounting point 10. Simulation is used to verify the theory, effectively improving the load resistance of the rear suspension body side structure, which is of great significance to improving the performance of the whole vehicle. In addition, the improved structure of the present invention can be used in similar vehicle designs.

[0033] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A structure for improving the stiffness performance of the rear suspension mounting point of the rear longitudinal beam of an automobile body, characterized in that: A rear longitudinal beam inner reinforcement plate (16) is arranged inside the rear longitudinal beam (12); a rear sub-frame rear fixing bracket (19) is arranged between the rear longitudinal beam (12) and the rear longitudinal beam inner reinforcement plate (14); a sub-frame rear fixing nut (17) penetrates the rear longitudinal beam (12), the sub-frame rear fixing bracket (19) and the rear longitudinal beam inner reinforcement plate (16); the position where the sub-frame rear fixing nut (17) penetrates is the rear sub-frame rear mounting point (10); the rear longitudinal beam (12), the rear longitudinal beam inner reinforcement plate (16) and the rear suspension spring fixing seat (14) are fixedly connected; the position of the rear suspension spring fixing seat (14) is the rear spring mounting point (9).

2. The structure for improving the stiffness performance of the rear suspension mounting point of the rear longitudinal beam of the automobile body according to claim 1 is characterized in that: The rear longitudinal beam (12) is arranged on the vehicle body bottom plate (11).

3. The structure for improving the stiffness performance of the rear suspension mounting point of the rear longitudinal beam of the automobile body according to claim 2 is characterized in that: The vehicle body bottom plate (11) is connected to the rear subframe body (1), the vehicle body bottom plate (11) is connected to the rear coil spring (2), and the rear coil spring (2) is connected to the rear lower control arm (3).

4. The structure for improving the stiffness performance of the rear suspension mounting point of the rear longitudinal beam of the automobile body according to claim 3 is characterized in that: The vehicle body bottom plate (11) is connected to the rear shock absorber (8), and the rear shock absorber (8) is connected to the rear lower control arm (3).

5. The structure for improving the stiffness performance of the rear suspension mounting point of the rear longitudinal beam of the automobile body according to claim 4 is characterized in that: The rear longitudinal beam (12) comprises a left rear longitudinal beam (20) and a right rear longitudinal beam (21), and the left rear longitudinal beam (20) and the right rear longitudinal beam (21) are respectively connected to the vehicle floor (11).

6. The structure for improving the stiffness performance of the rear suspension mounting point of the rear longitudinal beam of the automobile body according to claim 5, characterized in that: A sub-frame front fixing nut (18) is also arranged on the rear longitudinal beam (12).

7. The structure for improving the stiffness performance of the rear suspension mounting point of the rear longitudinal beam of an automobile body according to claim 6, characterized in that: The structure for improving the rigidity performance of the rear suspension mounting point of the rear longitudinal beam of the automobile body also includes a rear pull rod (4) and a rear trailing arm (5).

8. The structure for improving the stiffness performance of the rear suspension mounting point of the rear longitudinal beam of an automobile body according to claim 1 or 2, characterized in that: The rear left side of the rear sub-frame body (1) is fixedly connected to the rear sub-frame rear mounting point (10) of the left rear longitudinal beam (20) via a sub-frame rear fixing bolt (17); the rear right side of the rear sub-frame body (1) is fixedly connected to the rear sub-frame rear mounting point (10) of the right rear longitudinal beam (21) via a sub-frame rear fixing bolt (17).

9. The structure for improving the stiffness performance of the rear suspension mounting point of the rear longitudinal beam of the automobile body according to claim 8, characterized in that: The front left side of the rear sub-frame body (1) is fixedly connected to the front sub-frame rear mounting point (6) of the left rear longitudinal beam (20) via the sub-frame front fixing bolt (18); the front right side of the rear sub-frame body (1) is fixedly connected to the front sub-frame rear mounting point (6) of the right rear longitudinal beam (21) via the sub-frame front fixing bolt (18).

Images