An engine cover inner panel having a variable cross-section draw bead

Abstract

The application provides an engine cover inner plate with variable cross-section drawing rib, relates to the technical field of engine covers, and comprises a cover outer plate, the rear side of the inner surface of the cover outer plate is welded with symmetrically distributed connecting frames, a first embedding groove is arranged on the inner surface of the cover outer plate, a second embedding groove is arranged on the inner wall of the first embedding groove, and a plurality of adjustable buffer columns are fixedly installed on the edge side of the bottom of the cover outer plate. Through the embedding of the inner plate and the second embedding groove and the multi-point rigid connection of the positioning assembly, the integration of the cover outer plate, the inner plate and the drawing rib assembly is realized. When external force acts on the center of the cover, the load is efficiently transmitted to the extending ribs distributed in a radial manner through the main rib, and is further dispersed to the outer plate edge and the vehicle body frame supported by the adjustable buffer columns through the positioning assembly. The design optimizes the force flow path and significantly reduces local stress concentration.

Description

Technical Field

[0001] This utility model relates to the field of engine cover technology, and more specifically, to an inner plate of an engine cover with variable cross-section drawn ribs. Background Technology

[0002] Driven by the dual trends of lightweighting and safety performance in automobiles, the design of the hood inner panel, as a key load-bearing structure, faces severe challenges. The inner panel not only needs to provide precise styling support and rigidity assurance for the outer panel to meet high-quality aesthetic requirements, but also needs to effectively absorb energy through controlled deformation in a collision, balancing occupant protection and pedestrian safety. This contradictory requirement places extremely high demands on the material application, structural topology, and mechanical properties of the inner panel.

[0003] In current automotive hood assemblies, the inner panel serves as a core supporting structure, and its collaborative load-bearing performance with the outer panel is crucial. Ideally, the inner panel, through its structural topology and connection design, should provide uniform and efficient back support to the outer panel, ensuring that the assembly maintains stable mechanical properties and geometry under various operating conditions.

[0004] However, existing designs often suffer from uneven distribution of support stiffness. Particularly in the large, flat area of ​​the hood, insufficient inner panel support topology (e.g., sparse rib layout, small moment of inertia) or poor density and location of connection points with the inner panel (e.g., adhesive points, fastening points) makes the outer panel prone to deformation exceeding its elastic limit under localized vertical loads (e.g., static pressure, dynamic hail impacts). This results in irreversible plastic indentations and a significant weakening of the support effect. This not only directly affects the vehicle's appearance and perceived value, but repeated micro-plastic deformation over time can also induce fatigue damage to the outer panel material, accelerate paint deterioration, and ultimately weaken the overall stiffness and structural durability of the assembly.

[0005] Therefore, we made improvements and proposed an engine cover inner plate with variable cross-section duct ribs. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model provides an inner engine hood panel with variable cross-section drawn ribs, which solves the problems mentioned in the background section.

[0007] To achieve the above objectives, this utility model provides the following technical solution: An engine hood inner panel with variable cross-section drawbars includes an outer hood panel. A symmetrically distributed connecting frame is welded to the rear side of the inner surface of the outer hood panel. A first groove is formed on the inner surface of the outer hood panel, and a second groove is formed on the inner wall of the first groove. Several adjustable buffer posts are fixedly installed on the bottom side of the outer hood panel. The second groove has an inner plate inside, and a number of positioning components are provided between the bottom edge of the inner plate and the inner wall of the first groove. The upper surface of the inner plate is provided with a drawbead assembly.

[0008] As a preferred technical solution of this application, the positioning component includes a plurality of positioning seats disposed on the inner wall of the first groove. The positioning seats are fixedly connected to the inner wall of the first groove by second bolts installed thereon. A third threaded hole is provided at one end of the positioning seat. A limit groove is provided on the inner surface of the positioning seat. A first threaded hole corresponding to the position and number of the third threaded hole is provided on the inner plate. A first bolt is threadedly connected to the first threaded hole. The first bolt is threadedly connected to the third threaded hole.

[0009] As a preferred technical solution of this application, the drawbead assembly includes a main rib disposed at the center of the upper surface of the inner plate, and several extension ribs are disposed on both sides of the main rib on the upper surface of the inner plate. The two ends of the main rib and the ends of the extension ribs are provided with second threaded holes, and the second threaded holes are threadedly connected to the first bolt.

[0010] As a preferred technical solution of this application, a buffer pad is adhered to the inner surface of the limiting groove.

[0011] As a preferred technical solution of this application, both the main reinforcement and the extension reinforcement are protruding structures, and both the main reinforcement and the extension reinforcement have variable cross sections.

[0012] As a preferred technical solution of this application, the cross-sections of the main reinforcement and the extension reinforcement are in the form of isosceles trapezoids.

[0013] As a preferred technical solution of this application, the extension bars are non-parallel in direction and are located radially on both sides of the main bars.

[0014] As a preferred technical solution of this application, the inner plate and the drawbead assembly are integrally formed structures.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: In the scheme of this application: By employing the coordinated use of the outer hood panel, connecting frame, first recess, adjustable buffer post, inner panel, positioning assembly, first threaded hole, first bolt, second recess, and drawbar assembly, and through the interlocking of the inner panel with the second recess and the multi-point rigid connection of the positioning assembly, the hood outer panel, inner panel, and drawbar assembly are integrated into a single unit. When an external force is applied to the center of the hood, the load is efficiently transferred through the main ribs to the radially distributed extension ribs, and further dispersed through the positioning assembly to the edges of the outer panel and the body frame supported by the adjustable buffer post. This design optimizes the force flow path, significantly reduces local stress concentration, and effectively improves the overall rigidity, dent resistance, and structural durability of the assembly. Attached Figure Description

[0016] Figure 1 A three-dimensional structural schematic diagram of an inner engine hood plate with variable cross-section drawbars provided for this application; Figure 2 A schematic diagram of the structure of an engine hood inner plate with variable cross-section drawbar in an inverted state, provided for this application; Figure 3 An exploded structural diagram of an inner engine hood plate with variable cross-section drawbars provided in this application; Figure 4 A schematic diagram of the connection structure between the inner plate and the drawbar assembly in an engine hood inner plate with variable cross-section drawbars provided in this application; Figure 5 A schematic diagram of the structure of a drawbar assembly in the inner plate of an engine hood with variable cross-section drawbars provided in this application; Figure 6 This is a schematic diagram of the positioning component in the inner panel of an engine hood with variable cross-section drawn ribs, provided in this application.

[0017] The image shows: 1. Outer cover; 2. Connecting frame; 3. First groove; 4. Adjustable buffer post; 5. Inner plate; 6. Positioning assembly; 7. First threaded hole; 8. First bolt; 9. Second groove; 10. Drawbead assembly; 11. Main rib; 12. Extension rib; 13. Second threaded hole; 14. Positioning seat; 15. Limiting groove; 16. Buffer pad; 17. Third threaded hole; 18. Second bolt. Detailed Implementation

[0018] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0019] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0020] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0021] 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. Example 1

[0022] Please refer to Figures 1-6 An engine hood inner panel with variable cross-section duct ribs includes an outer hood panel 1, a symmetrically distributed connecting frame 2 welded to the rear side of the inner surface of the outer hood panel 1, a first groove 3 opened on the inner surface of the outer hood panel 1, a second groove 9 opened on the inner wall of the first groove 3, and several adjustable buffer posts 4 fixedly installed on the bottom side of the outer hood panel 1. The second groove 9 has an inner plate 5 inside. Several positioning components 6 are provided between the bottom edge of the inner plate 5 and the inner wall of the first groove 3. The upper surface of the inner plate 5 is provided with a drawbead assembly 10.

[0023] Furthermore, the positioning assembly 6 includes several positioning seats 14 disposed on the inner wall of the first groove 3. The positioning seats 14 are fixedly connected to the inner wall of the first groove 3 by second bolts 18 installed thereon. One end of the positioning seat 14 is provided with a third threaded hole 17. A limit groove 15 is provided on the inner surface of the positioning seat 14. The inner plate 5 is provided with first threaded holes 7 corresponding to the position and number of the third threaded holes 17. A first bolt 8 is threadedly connected to the first threaded hole 7. The first bolt 8 is threadedly connected to the third threaded hole 17. This achieves precise alignment and rigid locking of the outer cover 1, inner plate 5 and drawbead assembly 10 in multiple positions.

[0024] Furthermore, the drawbar assembly 10 includes a main rib 11 located at the center of the upper surface of the inner plate 5. Several extension ribs 12 are provided on both sides of the main rib 11 on the upper surface of the inner plate 5. Second threaded holes 13 are provided at both ends of the main rib 11 and the ends of the extension ribs 12, and these second threaded holes 13 are threadedly connected to the first bolt 8. This constructs a rigid mechanical network radiating from the center outwards. This structure tightly connects the inner plate 5, the drawbar assembly 10, and the positioning assembly 6 into a single unit, significantly enhancing the structural integrity of the engine hood assembly.

[0025] Furthermore, a buffer pad 16 is bonded to the inner surface of the limiting groove 15. This eliminates the microscopic gaps and hard contacts between the edge of the inner plate 5 and the positioning seat 14 after assembly. It effectively absorbs the high-frequency vibration energy during vehicle operation, suppresses abnormal noises caused by contact friction, and slows down stress transmission. Example 2

[0026] The engine hood inner plate with variable cross-section ribs provided in Embodiment 1 is further optimized. Specifically, both the main rib 11 and the extension rib 12 are raised structures, and both the main rib 11 and the extension rib 12 have variable cross-sections.

[0027] Furthermore, the main reinforcement 11 and the extension reinforcement 12 have isosceles trapezoidal cross-sections. This cross-sectional shape achieves excellent force flow guidance, ensuring that the load can be smoothly transferred from the top of the reinforcement to the inner plate 5 matrix, effectively avoiding stress concentration at abrupt changes in the cross-section.

[0028] Furthermore, the extension ribs 12 are non-parallel, and are located radially on both sides of the main ribs 11. This allows the concentrated load borne by the main ribs 11 to be efficiently distributed and transferred in multiple different directions to the positioning assembly 6 and the peripheral support area of ​​the outer hood panel 1.

[0029] Furthermore, the inner plate 5 and the drawbar assembly 10 are integrally formed structures. This eliminates gaps and stress concentration points that may occur with traditional assembly connections, allowing for more efficient and direct load transfer between the main rib 11 and the inner plate 5. Integral forming not only simplifies the production and assembly process and reduces the number of parts and manufacturing costs, but also enhances the overall rigidity, deformation resistance, and durability of the engine hood assembly by strengthening structural continuity.

[0030] The process of using the engine hood inner plate with variable cross-section drawbar provided by this utility model is as follows: In use, the stamped outer cover plate 1 and inner cover plate 5 are assembled. First, the circumferential edge of the inner cover plate 5 is precisely inserted into the pre-set second groove 9 on the inner side of the outer cover plate 1 to achieve initial positioning and fitting. Then, the positioning seats 14 of each positioning component 6 are fastened to the designated installation positions on the inner wall of the first groove 3 on the inner side of the outer cover plate 1 using the second bolts 18. At this time, the limiting groove 15 on the positioning seat 14 is precisely engaged with the outer surface edge of the inner cover plate 5, and the third threaded hole 17 on the positioning seat 14 is coaxially aligned with the first threaded hole 7 on the inner cover plate 5 and the second threaded hole 13 at the end of the drawbead assembly 10. The first bolt 8 is then passed through the first threaded hole 7, the second threaded hole 13 and screwed into the third threaded hole 17 to lock, thereby fixing the drawbead assembly 10, the inner cover plate 5 and the positioning component 6 together as one unit. In this way, a multi-point rigid connection along the circumference between the inner cover plate 5 and the outer cover plate 1 is completed. After assembly, the outer hood panel 1 is mounted above the engine compartment via its connecting bracket 2. When the outer hood panel 1 is in the closed state, if its central area is subjected to an external load, the load will be directly transferred to the main rib 11 of the drawbar assembly 10. The main rib 11 decomposes the concentrated force through its radially distributed extension ribs 12 and transfers it to the positioning components 6 at the ends of each extension rib 12, thereby dispersing the load to the edge rigid support area of ​​the outer hood panel 1. At the same time, in the closed state, the outer hood panel 1 is in direct contact with the body frame through the adjustable buffer pillar 4 at its bottom, forming an auxiliary support path. Therefore, the external load borne by the outer hood panel 1 is ultimately mainly borne by the body structure through the mechanical decomposition and transfer of the drawbar assembly 10, significantly reducing the local stress load on the outer hood panel 1 and the inner panel 5, effectively suppressing the plastic indentation deformation of the outer hood panel 1, thereby improving the overall rigidity, indentation resistance and durability of the engine hood assembly.

[0031] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] Obviously, the embodiments described above are only some embodiments of this utility model, not all embodiments. The accompanying drawings show preferred embodiments of this utility model, but do not limit the patent scope of this utility model. This utility model can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this utility model.

Claims

1. An inner hood panel with variable cross-section drawn ribs, characterized in that, Includes an outer cover plate (1), with symmetrically distributed connecting frames (2) welded to the rear side of the inner surface of the outer cover plate (1), a first groove (3) is opened on the inner surface of the outer cover plate (1), a second groove (9) is opened on the inner wall of the first groove (3), and several adjustable buffer columns (4) are fixedly installed on the side of the bottom of the outer cover plate (1). The second groove (9) is provided with an inner plate (5), and a number of positioning components (6) are provided between the bottom side of the inner plate (5) and the inner wall of the first groove (3). The upper surface of the inner plate (5) is provided with a drawbead assembly (10).

2. The engine hood inner plate with variable cross-section drawn ribs according to claim 1, characterized in that, The positioning component (6) includes a plurality of positioning seats (14) disposed on the inner wall of the first groove (3). The positioning seats (14) are fixedly connected to the inner wall of the first groove (3) by second bolts (18) installed thereon. A third threaded hole (17) is provided at one end of the positioning seat (14). A limit groove (15) is provided on the inner surface of the positioning seat (14). A first threaded hole (7) corresponding to the position and number of the third threaded hole (17) is provided on the inner plate (5). A first bolt (8) is threadedly connected to the first threaded hole (7). The first bolt (8) is threadedly connected to the third threaded hole (17).

3. The engine hood inner plate with variable cross-section drawn ribs according to claim 1, characterized in that, The drawbar assembly (10) includes a main rib (11) located at the center of the upper surface of the inner plate (5). Several extension ribs (12) are provided on both sides of the main rib (11) on the upper surface of the inner plate (5). The two ends of the main rib (11) and the ends of the extension ribs (12) are provided with second threaded holes (13). The second threaded holes (13) are threadedly connected to the first bolt (8).

4. The engine hood inner plate with variable cross-section drawn ribs according to claim 2, characterized in that, A buffer pad (16) is adhered to the inner surface of the limiting groove (15).

5. The engine hood inner plate with variable cross-section drawn ribs according to claim 3, characterized in that, Both the main reinforcement (11) and the extension reinforcement (12) are protruding structures, and both the main reinforcement (11) and the extension reinforcement (12) have variable cross sections.

6. The engine hood inner plate with variable cross-section drawn ribs according to claim 3, characterized in that, The cross-sections of the main reinforcement (11) and the extension reinforcement (12) are isosceles trapezoidal structures.

7. The engine hood inner plate with variable cross-section drawn ribs according to claim 3, characterized in that, The extension bars (12) are non-parallel, and the extension bars (12) are located on both sides of the main bars (11) in a radial pattern.

8. The engine hood inner plate with variable cross-section drawn ribs according to claim 3, characterized in that, The inner plate (5) and the drawbead assembly (10) are integrally formed structures.

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