Front longitudinal beam cavity structure and vehicle

Abstract

The utility model provides a front longitudinal beam cavity structure and a vehicle. The front longitudinal beam cavity structure comprises a front longitudinal beam outer plate, a front longitudinal beam inner plate, a longitudinal beam reinforcing plate and an engine suspension front supporting plate. The front longitudinal beam outer plate and the front longitudinal beam inner plate jointly form a main cavity, and the longitudinal beam reinforcing plate and the engine suspension front supporting plate are both located in the main cavity. A first sub-cavity is formed by the engine suspension front supporting plate and the front longitudinal beam outer plate. The longitudinal beam reinforcing plate and the front longitudinal beam outer plate form a second sub-cavity. The front collision stress can be effectively dispersed and borne, and the fatigue endurance life is prolonged.

Description

Technical Field

[0001] The present application relates to the field of vehicles, and in particular to a front longitudinal beam cavity structure and a vehicle. Background Art

[0002] As living standards improve, consumers' demands for automotive quality are becoming increasingly stringent. The front engine compartment connection structure, as a component that indirectly contacts the driver and passengers, is gaining increasing attention for its safety and quietness. Furthermore, as a crucial component of the overall vehicle body structure, the high-efficiency and superior structure not only provides high rigidity, enhancing durability, NVH, VD, and crash safety performance, but also improves the vehicle's bending and torsional stiffness, modal properties, and NTF / VTF (Noise Transfer Function / Vibration Transfer Function).

[0003] The traditional front longitudinal beam cavity structure consists of a U-shaped structure consisting of an inner longitudinal beam panel, an outer longitudinal beam panel, and a front longitudinal beam reinforcement plate. This lacks a stable force transmission channel and the connection between the inner and outer longitudinal beam panels is not stable, affecting the torsional performance of the vehicle. The internal structure of the front longitudinal beam assembly is complex and contains a large number of small parts.

[0004] At present, the front longitudinal beam cavity structure mainly has the following problems: 1. The front longitudinal beam cavity structure is weak and cannot effectively transmit the collision force to the rear longitudinal beam of the vehicle body, and cannot effectively ensure the personal safety of the cockpit occupants. 2. When the left and right wheels of the vehicle are subjected to loads in different directions during driving, the vehicle body will produce torsional deformation due to torsion. When the torsional stiffness is insufficient, the vehicle body will undergo large torsional deformation under the action of external force. After repeated loading, local weak points may be fatigued and damaged, resulting in friction and abnormal noise between the various components of the vehicle, affecting the vehicle's NTF performance. 3. In order to meet the torsional stiffness of the entire vehicle, the joint design at the front longitudinal beam assembly of the current model is complex, the cost is high, and the effect is not good.

[0005] Therefore, it is necessary to provide an improved front longitudinal beam cavity structure and vehicle to solve the above problems. Utility Model Content

[0006] The present application provides a front longitudinal beam cavity structure and a vehicle that can effectively disperse and withstand the force of a frontal collision.

[0007] The present application provides a front longitudinal beam cavity structure, including a front longitudinal beam outer plate, a front longitudinal beam inner plate, a longitudinal beam reinforcement plate and an engine suspension front support plate; the front longitudinal beam outer plate and the front longitudinal beam inner plate together form a main cavity, the longitudinal beam reinforcement plate and the engine suspension front support plate are both located in the main cavity; the engine suspension front support plate and the front longitudinal beam outer plate form a first sub-cavity; the longitudinal beam reinforcement plate and the front longitudinal beam outer plate form a second sub-cavity.

[0008] Furthermore, the engine suspension front support plate is located above the longitudinal beam reinforcement plate; the engine suspension front support plate includes a first trough body and an upper flange and a lower flange respectively located on the upper and lower sides of the first trough body; the opening of the first trough body faces the front longitudinal beam outer plate, and the upper flange and part of the lower flange are respectively connected to the front longitudinal beam outer plate; the bottom wall of the first trough body is connected to the front longitudinal beam inner plate.

[0009] Furthermore, the longitudinal beam reinforcement plate includes a second trough body and an upper flange and a lower flange respectively located on the upper and lower sides of the second trough body; the opening of the second trough body faces the front longitudinal beam outer plate, and part of the upper flange and the lower flange are respectively connected to the front longitudinal beam outer plate; the bottom wall of the second trough body is connected to the front longitudinal beam inner plate.

[0010] Furthermore, part of the upper flange of the longitudinal beam reinforcement plate is connected to part of the lower flange of the engine suspension front support plate, and the longitudinal beam reinforcement plate, the engine suspension front support plate and the front longitudinal beam inner plate together form a third sub-cavity; the first sub-cavity is located above the second sub-cavity; and the third sub-cavity is located between the first sub-cavity and the second sub-cavity.

[0011] Furthermore, the connection between the upper flange of the longitudinal beam reinforcement plate and the lower flange of the engine suspension front support plate is located in the middle of the main cavity; the width of the third sub-cavity is smaller than that of the first sub-cavity and the second sub-cavity.

[0012] Furthermore, the engine suspension front support plate, the front longitudinal beam outer plate and the front longitudinal beam inner plate together form a fourth sub-cavity, and the fourth sub-cavity is located above the first sub-cavity; the longitudinal beam reinforcement plate, the front longitudinal beam outer plate and the front longitudinal beam inner plate together form a fifth sub-cavity, and the fifth sub-cavity is located below the second sub-cavity.

[0013] Furthermore, the front longitudinal beam outer panel includes a first cavity and an upper flange and a lower flange respectively located on the upper and lower sides of the first cavity; the front longitudinal beam inner panel includes a second cavity and an upper flange and a lower flange respectively located on the upper and lower sides of the second cavity; the first cavity and the second cavity together form the main cavity; the upper flange and the lower flange of the front longitudinal beam outer panel are respectively connected to the upper flange and the lower flange of the front longitudinal beam inner panel.

[0014] Furthermore, the main cavity is rectangular, and the upper and lower connection points of the front longitudinal beam outer plate and the front longitudinal beam inner plate are both close to the middle of the main cavity in the Y direction.

[0015] Furthermore, it also includes a subframe fixing bracket, a subframe front mounting plate and a subframe front inner support plate; the upper edge of the subframe fixing bracket is connected to the front longitudinal beam inner plate, the upper edge of the subframe front inner support plate is connected to the front longitudinal beam outer plate, the upper edge of the subframe front mounting plate is connected to the lower connection between the front longitudinal beam outer plate and the front longitudinal beam inner plate; the lower edges of the subframe fixing bracket, the subframe front mounting plate and the subframe front inner support plate are connected.

[0016] Furthermore, the subframe fixing bracket, the subframe front inner support plate, the front longitudinal beam outer plate and the front longitudinal beam inner plate together form a lower cavity; the subframe front mounting plate divides the lower cavity into an inner cavity and an outer cavity arranged in parallel; the lower cavity is located below the main cavity.

[0017] The present application also provides a vehicle, comprising the above-mentioned front longitudinal beam cavity structure.

[0018] The main cavity of the present application, including the first sub-cavity and the second sub-cavity, can effectively disperse and withstand the force of a frontal collision, thereby improving fatigue endurance life. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 4 is a perspective view of a front longitudinal beam cavity structure according to an exemplary embodiment of the present application.

[0020] Figure 2 yes Figure 1 A three-dimensional view of the front longitudinal beam cavity structure from another perspective is shown.

[0021] Figure 3 yes Figure 1 The front longitudinal beam cavity structure shown is a three-dimensional view without the front longitudinal beam inner panel.

[0022] Figure 4 yes Figure 1 A three-dimensional view of the front longitudinal beam cavity structure from another perspective is shown.

[0023] Figure 5 yes Figure 4 A cross-sectional view of the front longitudinal beam cavity structure is shown.

[0024] Figure 6 It is a cross-sectional view of the front longitudinal beam cavity structure and engine suspension after assembly.

[0025] Figure 7 yes Figure 4 A cross-sectional view of the front longitudinal beam cavity structure is shown.

[0026] Description of Figure Numbers:

[0027] 10. Front longitudinal beam outer plate; 11. First cavity; 12. Upper flange; 13. Lower flange; 20. Front longitudinal beam inner plate; 201. Welding point; 202. Suspension mounting hole; 21. Second cavity; 22. Upper flange; 23. Lower flange; 30. Longitudinal beam reinforcement plate; 31. Second trough; 311. Bottom wall; 32. Upper flange; 33. Lower flange; 40. Engine suspension front support plate; 41. First trough; 411. Bottom wall; 42. Upper flange; 43. Lower flange; 50. Main cavity; 51. First sub-cavity; 52. Second sub-cavity; 53. Third sub-cavity; 54. Fourth sub-cavity; 55. Fifth sub-cavity; 60. Subframe fixing bracket; 70. Subframe front mounting plate; 80. Subframe front inner support plate; 90. Lower cavity; 91. Inner cavity; 92. Outer cavity. DETAILED DESCRIPTION

[0028] Here, the technical solutions in the embodiments (or "implementations") of the present application will be clearly and completely described in conjunction with the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0029] If there are terms related to directional indications or positional relationships in the embodiments of this application (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationship, movement, etc. between the components in a specific posture (as shown in the accompanying drawings); if the specific posture changes, the directional indication or positional relationship will also change accordingly. In addition, the terms "first" and "second" in the embodiments of this application are only used for the purpose of convenience of description and should not be understood as indicating or implying relative importance.

[0030] See also Figures 1 to 4 As shown, the present application provides a front longitudinal beam cavity structure, including a front longitudinal beam outer panel 10, a front longitudinal beam inner panel 20, a longitudinal beam reinforcement plate 30, and an engine suspension front support plate 40. The front longitudinal beam outer panel 10 and the front longitudinal beam inner panel 20 together form a main cavity 50. The longitudinal beam reinforcement plate 30 and the engine suspension front support plate 40 are both located in the main cavity 50, and the engine suspension front support plate 40 is located above the longitudinal beam reinforcement plate 30.

[0031] The front longitudinal beam outer panel 10 includes a first cavity 11 and upper and lower flanges 12 and 13 located on the upper and lower sides of the first cavity 11, respectively. The front longitudinal beam inner panel 20 includes a second cavity 21 and upper and lower flanges 22 and 23 located on the upper and lower sides of the second cavity 21, respectively. The first cavity 11 and the second cavity 21 together form the main cavity 50. The upper and lower flanges 12 and 13 of the front longitudinal beam outer panel 10 are connected to the upper and lower flanges 22 and 23 of the front longitudinal beam inner panel 20, respectively.

[0032] The upper and lower connections between the front longitudinal beam outer panel 10 and the front longitudinal beam inner panel 20, namely the connection between the upper flange 12 and the upper flange 22, and the connection between the lower flange 13 and the lower flange 23, are both located near the center of the main cavity 50 in the Y direction. The main body of the front longitudinal beam outer panel 10 and the front longitudinal beam inner panel 20 has no obvious bends or misalignments, and the force transmission path is clear and well-defined, with reasonable overlap, which can effectively distribute and transmit force.

[0033] The first cavity 11, the second cavity 21 and the main cavity 50 are all rectangular. The upper flange 12 and the lower flange 13 of the front longitudinal beam outer panel 10 are welded and fixed to the upper flange 22 and the lower flange 23 of the front longitudinal beam inner panel 20 respectively. The structure is simple and the lightweight effect is good, and the mold development cost is low.

[0034] According to different embodiments of the present application, the upper flange 12 and the upper flange 22, and the lower flange 13 and the lower flange 23 can also be fixed by bolting, riveting or snap fastening.

[0035] The front longitudinal beam inner plate 20 is provided with a suspension mounting hole 202 , and the front longitudinal beam outer plate 10 and the front longitudinal beam inner plate 20 are screwed and fixed by suspension bolts.

[0036] The longitudinal beam reinforcement plate 30 includes a second channel 31 and upper and lower flanges 32 and 33 located on the upper and lower sides of the second channel 31, respectively. The longitudinal beam reinforcement plate 30 is arranged in multiple sections along the vehicle length. The second channel 31, upper and lower flanges 32, 33 also form a multi-section structure, meaning the specific structure of each section varies. The second channel 31 has a U-shaped cross-section, with its opening facing the front longitudinal beam outer panel 10. Portions of the upper and lower flanges 32, 33 are connected to the front longitudinal beam outer panel 10. The bottom wall 311 of the second channel 31 is connected to the front longitudinal beam inner panel 20.

[0037] Compared with the traditional structure that is attached to the inner panel or the outer panel, the cavity enclosed by the longitudinal beam reinforcement plate 30 is rectangular, which is conducive to improving the collision force transmission effect.

[0038] The engine mount front support plate 40 includes a first channel 41 and upper and lower flanges 42 and 43 located on the upper and lower sides of the first channel 41. The engine mount front support plate 40 is arranged in multiple sections along the vehicle's length. The first channel 41, upper flange 42, and lower flange 43 also have a multi-section structure, meaning the specific structure of each section varies. The first channel 41 has a U-shaped cross-section, with its opening facing the front longitudinal beam outer panel 10. The upper flange 42 and a portion of the lower flange 43 are connected to the front longitudinal beam outer panel 10. The bottom wall 411 of the first channel 41 is connected to the front longitudinal beam inner panel 20.

[0039] The upper flange 32 and the lower flange 33 of the longitudinal beam reinforcement plate 30 are respectively welded to the front longitudinal beam outer plate 10, and the bottom wall 311 is welded to the front longitudinal beam inner plate 20. The upper flange 42 and the lower flange 43 of the engine suspension front support plate 40 are respectively welded to the front longitudinal beam outer plate 10, and the bottom wall 411 is welded to the front longitudinal beam inner plate 20. They are all welded structures, and the implementation process is simple. Only welding and fixing are required. There is no need to increase work stations and working hours to solve the NVH road noise problem, and the cost is low.

[0040] In some embodiments, the upper flange 32 and the lower flange 33 and the front longitudinal beam outer panel 10, the bottom wall 311 and the front longitudinal beam inner panel 20, the upper flange 42 and the lower flange 43 and the front longitudinal beam outer panel 10, and the bottom wall 411 and the front longitudinal beam inner panel 20 can also be fixed simultaneously by bolting, riveting or snapping.

[0041] See also Figures 5 to 7 As shown, the upper flange 32 of the longitudinal beam reinforcement plate 30 is connected to the lower flange 43 of the engine mount front support plate 40. The connection between the upper flange 32 of the longitudinal beam reinforcement plate 30 and the lower flange 43 of the engine mount front support plate 40 is located in the middle of the main cavity 50. Multiple weld points 201 are set at the connection between the longitudinal beam reinforcement plate 30 and the engine mount front support plate 40. This multiple fixation effectively prevents the problem of cracking of the front longitudinal beam inner panel 20 and the front longitudinal beam outer panel 10 along the Y direction after the vehicle is hit in the X direction.

[0042] In some areas, the longitudinal beam reinforcement plate 30 is fixed to the engine suspension front support plate 40 to form an S-shaped plate, which is welded and fixed to the front longitudinal beam outer plate 10 and the front longitudinal beam inner plate 20 to divide the main cavity 50 into multiple sub-cavities, and the connection between the upper flange 32 and the lower flange 43 is located in the middle of the main cavity 50.

[0043] like Figure 5 As shown, the engine mount front support plate 40 and the front longitudinal beam outer panel 10 form a first subcavity 51. The longitudinal beam reinforcement plate 30 and the front longitudinal beam outer panel 10 form a second subcavity 52, with the first subcavity 51 located above the second subcavity 52. ​​The longitudinal beam reinforcement plate 30, the engine mount front support plate 40, and the front longitudinal beam inner panel 20 together form a third subcavity 53. Vertically, the third subcavity 53 is located between the first subcavity 51 and the second subcavity 52.

[0044] The width of the third sub-cavity 53 is smaller than that of the first sub-cavity 51 and the second sub-cavity 52 .

[0045] The engine suspension front support plate 40, the front longitudinal beam outer panel 10, and the front longitudinal beam inner panel 20 together form a fourth sub-cavity 54, which is located above the first sub-cavity 51. The longitudinal beam reinforcement plate 30, the front longitudinal beam outer panel 10, and the front longitudinal beam inner panel 20 together form a fifth sub-cavity 55, which is located below the second sub-cavity 52.

[0046] The fourth sub-cavity 54, the first sub-cavity 51, the third sub-cavity 53, the second sub-cavity 52 and the fifth sub-cavity 55 are distributed in sequence along the vertical direction of the main cavity 50, forming a pattern of a main cavity within a sub-cavity. The larger the cavity area, the more effective the force transmission path, the greater the contribution to NVH road noise and vibration suppression, and the improved safety and durability performance.

[0047] See also Figures 5 to 7 As shown, the front longitudinal beam cavity structure further includes a subframe fixing bracket 60, a subframe front mounting plate 70, and a subframe front inner support plate 80. The upper edge of the subframe fixing bracket 60 is connected to the front longitudinal beam inner plate 20, the upper edge of the subframe front inner support plate 80 is connected to the front longitudinal beam outer plate 10, and the upper edge of the subframe front mounting plate 70 is connected to the lower connection between the front longitudinal beam outer plate 10 and the front longitudinal beam inner plate 20. The lower edges of the subframe fixing bracket 60, the subframe front mounting plate 70, and the subframe front inner support plate 80 are connected.

[0048] The subframe fixing bracket 60, the subframe front inner support plate 80, the front longitudinal beam outer plate 10, and the front longitudinal beam inner plate 20 together form a lower cavity 90. The subframe front mounting plate 70 divides the lower cavity 90 into an inner cavity 91 and an outer cavity 92 arranged in parallel. The lower cavity 90 is located below the main cavity 50.

[0049] The front longitudinal beam outer panel 10 is connected to the front longitudinal beam inner panel 20 to form a main cavity 50, which effectively improves the front force efficiency of the vehicle. In addition, the longitudinal beam reinforcement plate 30 and the engine suspension front support plate 40 are connected to the front longitudinal beam outer panel 10 and the front longitudinal beam inner panel 20. The entire front longitudinal beam assembly is designed as an integrated structure, which can effectively disperse the force transmitted in all directions and improve the overall torsional stiffness of the vehicle body.

[0050] The design of the main cavity 50 and its subcavities not only effectively improves the torsional rigidity of the vehicle body, but also ensures stable performance by absorbing energy in the X-axis through the cavity partitioning structure. The main cavity 50 is located on a critical force transmission path, and its cross-sectional size is related to the magnitude of the force applied and the efficiency of force transmission. Multi-objective topology optimization can be used to determine the critical dimensions and area. Increasing this dimension results in minimal change in efficiency, while decreasing this dimension results in a linear decrease. This front longitudinal beam cavity structure not only meets performance requirements, but also balances lightweighting and cost considerations.

[0051] No additional patching, increased material thickness, or structural adhesive is required on the front longitudinal beam outer panel 10 and the front longitudinal beam inner panel 20 to address structural durability issues. The front longitudinal beam cavity structure framework is well-structured, and the overall modal properties of the rear wheel arch are good, with no resonance issues. It also contributes significantly to the vehicle's torsional stiffness, meeting the vehicle's torsional stiffness targets. The front longitudinal beam cavity structure offers good overall stiffness, and under extreme operating conditions, there are no issues such as abnormal noise, weld cracking, or fatigue cracking of the sheet metal caused by torsional stiffness. Furthermore, the front longitudinal beam cavity structure not only meets performance requirements but also saves a significant amount of space to meet the layout requirements of engine mounts and tires.

[0052] The present application also provides a vehicle, comprising the aforementioned front longitudinal beam cavity structure.

[0053] It should be noted that the technical solutions or technical features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the accompanying drawings; all modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application shall be included in the scope of protection of this application.

Claims

1. A front longitudinal beam cavity structure, characterized in that: It includes a front longitudinal beam outer plate, a front longitudinal beam inner plate, a longitudinal beam reinforcement plate and an engine suspension front support plate; the front longitudinal beam outer plate and the front longitudinal beam inner plate together form a main cavity, and the longitudinal beam reinforcement plate and the engine suspension front support plate are both located in the main cavity; the engine suspension front support plate and the front longitudinal beam outer plate form a first sub-cavity; the longitudinal beam reinforcement plate and the front longitudinal beam outer plate form a second sub-cavity.

2. The front longitudinal beam cavity structure according to claim 1, characterized in that: The engine suspension front support plate is located above the longitudinal beam reinforcement plate; the engine suspension front support plate includes a first trough body and an upper flange and a lower flange respectively located on the upper and lower sides of the first trough body; the opening of the first trough body faces the front longitudinal beam outer plate, the upper flange and part of the lower flange are respectively connected to the front longitudinal beam outer plate; the bottom wall of the first trough body is connected to the front longitudinal beam inner plate.

3. The front longitudinal beam cavity structure according to claim 2, characterized in that: The longitudinal beam reinforcement plate includes a second trough body and an upper flange and a lower flange respectively located on the upper and lower sides of the second trough body; the opening of the second trough body faces the front longitudinal beam outer plate, and parts of the upper flange and the lower flange are respectively connected to the front longitudinal beam outer plate; the bottom wall of the second trough body is connected to the front longitudinal beam inner plate.

4. The front longitudinal beam cavity structure according to claim 3, characterized in that: Part of the upper flange of the longitudinal beam reinforcement plate is connected to part of the lower flange of the engine suspension front support plate, and the longitudinal beam reinforcement plate, the engine suspension front support plate and the front longitudinal beam inner plate together form a third sub-cavity; the first sub-cavity is located above the second sub-cavity; and the third sub-cavity is located between the first sub-cavity and the second sub-cavity.

5. The front longitudinal beam cavity structure according to claim 4, characterized in that: The connection between the upper flange of the longitudinal beam reinforcement plate and the lower flange of the engine suspension front support plate is located in the middle of the main cavity; the width of the third sub-cavity is smaller than that of the first sub-cavity and the second sub-cavity.

6. The front longitudinal beam cavity structure according to claim 3, characterized in that: The engine suspension front support plate, the front longitudinal beam outer plate and the front longitudinal beam inner plate together form a fourth sub-cavity, and the fourth sub-cavity is located above the first sub-cavity; the longitudinal beam reinforcement plate, the front longitudinal beam outer plate and the front longitudinal beam inner plate together form a fifth sub-cavity, and the fifth sub-cavity is located below the second sub-cavity.

7. The front longitudinal beam cavity structure according to claim 1, characterized in that: The front longitudinal beam outer panel includes a first cavity and an upper flange and a lower flange respectively located on the upper and lower sides of the first cavity; the front longitudinal beam inner panel includes a second cavity and an upper flange and a lower flange respectively located on the upper and lower sides of the second cavity; the first cavity and the second cavity together form the main cavity; the upper flange and the lower flange of the front longitudinal beam outer panel are respectively connected to the upper flange and the lower flange of the front longitudinal beam inner panel.

8. The front longitudinal beam cavity structure according to claim 1, characterized in that: The main cavity is rectangular, and the upper and lower connection points of the front longitudinal beam outer plate and the front longitudinal beam inner plate are both close to the middle of the main cavity in the Y direction.

9. The front longitudinal beam cavity structure according to claim 1, characterized in that: It also includes a subframe fixing bracket, a subframe front mounting plate and a subframe front inner support plate; the upper edge of the subframe fixing bracket is connected to the front longitudinal beam inner plate, the upper edge of the subframe front inner support plate is connected to the front longitudinal beam outer plate, the upper edge of the subframe front mounting plate is connected to the lower connection between the front longitudinal beam outer plate and the front longitudinal beam inner plate; the lower edges of the subframe fixing bracket, the subframe front mounting plate and the subframe front inner support plate are connected.

10. The front longitudinal beam cavity structure according to claim 9, characterized in that: The subframe fixing bracket, the subframe front inner support plate, the front longitudinal beam outer plate and the front longitudinal beam inner plate together form a lower cavity; the subframe front mounting plate divides the lower cavity into an inner cavity and an outer cavity arranged in parallel; the lower cavity is located below the main cavity.

11. A vehicle, characterized in that: It comprises the front longitudinal beam cavity structure according to any one of claims 1 to 10.

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