Engine hood inner plate, engine hood and vehicle
By setting the weakened frame and connecting reinforcement ribs of the step structure at the weakened window of the inner plate of the engine hood, the problem of poor mechanical properties of the inner plate of the engine hood is solved, higher stiffness and smaller assembly deformation are achieved, and the European standard E-NCAP five-star collision safety requirements are met.
Patent Information
- Application Number
- CN202421994913.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-16
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-08-16
AI Technical Summary
The structural mechanical properties of the existing engine hood inner plate at the weakened window are poor, which makes it impossible to effectively protect passenger safety during car collisions. At the same time, the deformation amount during assembly is large, making it difficult to meet the E-NCAP five-star collision safety requirements of export models.
A kind of engine hood inner plate is designed, by setting a weakened frame of the step structure at the weakened window and setting connecting reinforcement ribs inside it, including main and secondary reinforcement ribs along the length and width of the vehicle body, combining the collapsed part and weight reduction holes, the stiffness and weight of the inner plate are optimized and the assembly stability is enhanced.
It improves the stiffness and assembly stability of the inner plate of the engine hood, reduces the amount of deformation during the assembly process, reduces the damage to pedestrians caused by car collisions, and meets the European standard E-NCAP five-star collision safety requirements.
Smart Images
Figure CN223045841U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of engine hoods, and particularly relates to an inner panel of an engine hood, an engine hood and a vehicle. Background Art
[0002] With the rapid development of the automotive industry, the comfort and safety of automobiles have attracted more and more attention from consumers, and major automobile manufacturers are constantly striving for innovation to improve the safety of automobiles. The engine hood is used to cover the engine, and its main structure consists of an inner panel and an outer panel. The structure of the inner panel of the engine hood directly affects the collision safety of the vehicle.
[0003] In the prior art, the inner panel of the engine hood usually has a weakened window in the middle, so that a large amount of energy can be absorbed by the inner panel of the engine hood when a vehicle collides, and the head injury value of pedestrians can be reduced through the energy absorption effect of the inner panel of the engine hood, greatly reducing the harm to pedestrians caused by vehicle collisions; however, only opening the weakened window will lead to poor mechanical properties of the structural form of the inner panel of the engine hood, resulting in the inability of the stiffness of the inner panel of the engine hood itself to ensure the safety of passengers when the vehicle has an accidental frontal collision. For this reason, domestic manufacturers have introduced the use of W-shaped, double-X-shaped, honeycomb-shaped and matrix-shaped reinforcing ribs in the weakened window to increase the stiffness of the inner panel body of the engine hood. However, the inner panel of the engine hood with the above structural forms has problems such as poor forming process and large deformation during assembly with the outer panel of the engine hood. At the same time, the requirements for export models in the overseas market are more stringent, and it is necessary to meet the E-NCAP five-star vehicle collision safety requirements. Therefore, in this context, there is an urgent need to design a new inner panel structure of the engine hood to meet the requirements of the support stiffness and strength of the engine hood and the safety collision requirements for pedestrian protection. Summary of the Utility Model
[0004] In view of this, the utility model provides an inner panel of an engine hood, an engine hood and a vehicle. By re-optimizing the design of the weakened frame structure at the weakened window on the inner panel body and the connecting reinforcing ribs in the weakened frame, while ensuring the support stiffness and strength of the engine hood, the problem of large deformation during the assembly process of the engine hood is reduced, and the harm to pedestrians caused by vehicle collisions is reduced to meet the requirements of the European standard E-NCAP five-star collision for export models.
[0005] An inner panel of an engine hood provided by the utility model includes an inner panel body. A weakening window is provided on the inner panel body, and a weakening frame with a stepped structure is provided at the edge of the weakening window. A connecting reinforcing rib for strengthening the stiffness of the inner panel body is arranged in the weakening frame. The connecting reinforcing rib includes a first main reinforcing rib and a second main reinforcing rib extending from the front edge to the rear edge of the weakening frame along the vehicle body length direction, a first auxiliary reinforcing rib extending from the left edge of the weakening frame to the first main reinforcing rib along the vehicle body width direction, a second auxiliary reinforcing rib extending from the right edge of the weakening frame to the second main reinforcing rib along the vehicle body width direction, and a third auxiliary reinforcing rib and a fourth auxiliary reinforcing rib sequentially connected between the first main reinforcing rib and the second main reinforcing rib along the vehicle body length direction.
[0006] Furthermore, the first main reinforcing rib and the second main reinforcing rib are arranged at intervals in the weakening frame along the vehicle body width direction. The distance between the first main reinforcing rib and the second main reinforcing rib gradually increases from the front edge to the rear edge of the weakening frame. The first auxiliary reinforcing rib and the second auxiliary reinforcing rib respectively extend obliquely backward from the left edge and the right edge of the weakening frame to the first main reinforcing rib and the second main reinforcing rib. The third auxiliary reinforcing rib and the fourth auxiliary reinforcing rib are arranged at intervals between the first main reinforcing rib and the second main reinforcing rib along the vehicle body length direction.
[0007] Furthermore, the connection point of the first auxiliary reinforcing rib and the first main reinforcing rib and the connection point of the second auxiliary reinforcing rib and the second main reinforcing rib are both located between the third auxiliary reinforcing rib and the fourth auxiliary reinforcing rib. Collapsible parts with a convex structure are arranged at the connection points of the first main reinforcing rib and the second main reinforcing rib.
[0008] Furthermore, a number of weakening and weight-reducing holes are respectively arranged along the length direction of the first main reinforcing rib, the second main reinforcing rib, the first auxiliary reinforcing rib, the second auxiliary reinforcing rib, the third auxiliary reinforcing rib and the fourth auxiliary reinforcing rib. The weakening and weight-reducing holes are in a strip-shaped structure.
[0009] Furthermore, the stepped structure of the weakening frame is formed by the inner panel body protruding upward along the vehicle body height direction, and a number of auxiliary weight-reducing holes are arranged inside the edges of the weakening frame. The auxiliary weight-reducing holes are in a square structure.
[0010] Furthermore, taking the connection line between the midpoint of the front edge of the weakening frame and the midpoint of the rear edge of the weakening frame as the axis of symmetry, the first main reinforcing rib and the second main reinforcing rib and the first auxiliary reinforcing rib and the second auxiliary reinforcing rib are axially symmetrically distributed.
[0011] Furthermore, a number of bosses are formed at intervals on the edges of the weakening frame, the first main reinforcing rib, the second main reinforcing rib, the first secondary reinforcing rib, and the second secondary reinforcing rib, and annular grooves are formed on the bosses.
[0012] Furthermore, a number of buffer block support features for installing with the outer panel of the engine hood are also provided on the inner panel body, and the buffer block support features are arranged close to the connection between the connection reinforcing rib and the weakening frame.
[0013] An engine hood is also provided, including an outer panel of the engine hood and the above-mentioned inner panel of the engine hood.
[0014] A vehicle is also provided, including the above-mentioned engine hood.
[0015] The beneficial effects of the present utility model are as follows: For the inner panel of the engine hood provided by the present utility model, by redesigning the structure of the inner panel of the engine hood, the weakening frame structure at the weakening window on the inner panel body and the connection reinforcing rib structure within the weakening frame are optimized, so that the weight of the inner panel is reduced while the stiffness is significantly improved; at the same time, the buffer block support features on the inner panel body are arranged close to the connection reinforcing rib to better play a supporting role; and the new weakening frame structure and connection reinforcing rib structure can provide a good solution to the deformation of the engine hood assembly from welding to painting. After verification in the actual vehicle state, the deformation amount of the single piece after painting is within the positive and negative 0.7 tolerance range, and most areas are between 0.3 and 0.5, reducing the large problem of deformation of the engine hood during the assembly process; the weakening and weight-reducing holes and the crash box structure on the inner panel of the engine hood can also absorb a large amount of energy during a vehicle collision to reduce the pedestrian head injury value, reducing the harm of vehicle collision to pedestrians, so as to meet the requirements of the European standard E-NCAP five-star collision for export models. Description of the Drawings
[0016] The present utility model will be further described below with reference to the drawings and embodiments:
[0017] Figure 1 It is a schematic structural diagram of the inner panel of the engine hood in the present utility model;
[0018] Figure 2 It is an axonometric view of the inner panel of the engine hood in the present utility model;
[0019] Among them, the reference numerals are: 1 - inner panel body; 2 - weakening frame; 3 - first main reinforcing rib; 4 - second main reinforcing rib; 5 - first secondary reinforcing rib; 6 - second secondary reinforcing rib; 7 - third secondary reinforcing rib; 8 - fourth secondary reinforcing rib; 9 - crash box; 10 - boss; 11 - annular groove; 12 - weakening and weight-reducing hole; 13 - auxiliary weight-reducing hole; 14 - forming notch; 15 - installation positioning hole; 16 - lifting positioning hole. Detailed Embodiments
[0020] As shown in the figure, an inner panel of an engine hood provided by the present utility model includes an inner panel body 1. A weakened window is provided on the inner panel body, and a weakened frame 2 with a stepped structure is provided at the edge of the weakened window. A connecting and strengthening rib for enhancing the stiffness of the inner panel body is arranged inside the weakened frame 2. The connecting and strengthening rib includes a first main strengthening rib 3 and a second main strengthening rib 4 extending from the front edge to the rear edge of the weakened frame along the vehicle body length direction, a first secondary strengthening rib 5 extending from the left edge of the weakened frame to the first main strengthening rib 3 along the vehicle body width direction, a second secondary strengthening rib 6 extending from the right edge of the weakened frame to the second main strengthening rib 4 along the vehicle body width direction, and a third secondary strengthening rib 7 and a fourth secondary strengthening rib 8 sequentially connected between the first main strengthening rib 3 and the second main strengthening rib 4 along the vehicle body length direction. The front edge and the rear edge of the weakened frame 2 refer to the edge facing the vehicle head and the edge facing the vehicle tail along the vehicle body length direction during vehicle driving, and the left edge and the right edge of the weakened frame refer to the left door edge and the right door edge along the vehicle body width direction during vehicle driving. The weakened frame 2 is arranged inside the weakened window mainly for the inner panel of the engine hood to participate in collision energy absorption to protect and reduce the pedestrian head injury value when a vehicle collision occurs. The connecting and strengthening ribs arranged inside the weakened frame 2 can divide the entire area inside the weakened frame 2 into multiple small areas, thereby enhancing the overall rigidity and strength of the inner panel of the engine hood, and at the same time providing support for subsequent assembly with the outer panel of the engine hood to solve the problem of large deformation during the assembly of the engine hood; combined Figure 1 and Figure 2 As shown, the connecting and strengthening rib is mainly composed of a first main strengthening rib 3, a second main strengthening rib 4, a first secondary strengthening rib 5, a second secondary strengthening rib 6, a third secondary strengthening rib 7 and a fourth secondary strengthening rib 8, forming a fence-like structure inside the weakened frame 2. This fence-like structure can effectively reduce the weight of the part. And through CAE analysis and calculation, it is found that the bending stiffness and anti-deformation ability of the inner panel of the engine hood are significantly improved. For example, the sinking amount of the traditional double-X type connecting and strengthening rib structure is 9.8 mm, the sinking amount of the double-X + 1 structure is 4.65 mm, while the sinking amount of this fence-like structure is 3.73 mm. Therefore, the deformation amount of the front hood assembly from welding to painting is reduced. At the same time, after verification in the actual vehicle state, the deformation amount of the single piece after painting is within the positive and negative 0.7 tolerance range, and most areas are between 0.3 and 0.5.
[0021] In this embodiment, the first main reinforcing rib 3 and the second main reinforcing rib 4 are arranged at intervals in the weakening frame 2 along the vehicle body width direction, and the distance between the first main reinforcing rib 3 and the second main reinforcing rib 4 gradually increases from the front edge to the rear edge of the weakening frame. Since the weakening window on the inner panel of the engine hood is in the shape of a quasi-isosceles trapezoid, the opening near the rear edge is larger than the opening near the front edge. Therefore, the gradually increasing distance between the first main reinforcing rib 3 and the second main reinforcing rib 4 from the front edge to the rear edge can ensure that the entire inner panel of the engine hood has greater stiffness. The first auxiliary reinforcing rib 5 and the second auxiliary reinforcing rib 6 respectively extend obliquely backward from the left edge and the right edge of the weakening frame to the first main reinforcing rib 3 and the second main reinforcing rib 4. That is, a T-shaped structural form is formed between the first main reinforcing rib 3 and the first auxiliary reinforcing rib 5. This structural form can further improve the strength of the inner panel of the engine hood, thereby ensuring the overall safety of the engine hood. The third auxiliary reinforcing rib 7 and the fourth auxiliary reinforcing rib 8 are arranged at intervals in the length direction of the vehicle body between the first main reinforcing rib 3 and the second main reinforcing rib 4. The third auxiliary reinforcing rib 7 and the fourth auxiliary reinforcing rib 8 are parallel to each other, and the third auxiliary reinforcing rib 7 and the fourth auxiliary reinforcing rib 8 realize the connection of the first main reinforcing rib 3 and the second main reinforcing rib 4 in the vehicle body width direction, further improving the strength of the inner panel of the engine hood. At the same time, combined with Figure 1 As shown, the included angle B between the first main reinforcing rib 3 and the first auxiliary reinforcing rib 5 and the included angle A between the first main reinforcing rib 3 and the fourth auxiliary reinforcing rib 7 in this embodiment are both acute angles to simplify the forming process of the inner panel of the engine hood. The included angles A and B are preferably 80 degrees, which is the best.
[0022] In this embodiment, the connection point of the first auxiliary reinforcing rib 5 and the first main reinforcing rib 3 and the connection point of the second auxiliary reinforcing rib 6 and the second main reinforcing rib 4 are both located between the third auxiliary reinforcing rib 7 and the fourth auxiliary reinforcing rib 8. The first main reinforcing rib 3 and the second main reinforcing rib 4 are both provided with a crush part 9 in a convex structure at the connection point. The crush part 9 is a crush rib protruding upward, which can not only play a supporting role when assembling with the outer panel of the engine hood, but also promote the inner panel of the engine hood to collapse during a collision, reducing the harm to pedestrians.
[0023] In this embodiment, a plurality of weakening and weight-reducing holes 12 are respectively arranged along the length direction of the first main reinforcing rib 3, the second main reinforcing rib 4, the first auxiliary reinforcing rib 5, the second auxiliary reinforcing rib 6, the third auxiliary reinforcing rib 7 and the fourth auxiliary reinforcing rib 8. The weakening and weight-reducing holes 12 are in a strip-shaped structure. The weakening and weight-reducing holes 12 can be used for weight reduction of the inner panel of the engine hood and weakening during a collision, and can also leak liquid through the weakening and weight-reducing holes 12 when painting the inner panel of the engine hood and the outer panel of the engine hood.
[0024] In this embodiment, the stepped structure of the weakening frame 2 is formed by the upward protrusion of the inner panel body in the vehicle body height direction, and a plurality of auxiliary weight-reducing holes 13 are provided inside the edges of the weakening frame 2. The auxiliary weight-reducing holes 13 are of a square structure. The weakening frame 2 and the inner panel body 1 are of an integral structure. The weakening frame 2 with the stepped structure protrudes towards the outside of the inner panel body 1. The outside of the inner panel body 1 is connected and fixed to the outer panel of the engine hood. The weakening frame 2 is supported on the outer panel of the engine hood. Among them, the weakening frame 2 has a two-stage stepped structure, and the auxiliary weight-reducing holes 13 are arranged at the transition positions of the steps of the weakening frame 2. In addition to the function of weight reduction, the auxiliary weight-reducing holes 13 also have a weakening function.
[0025] In this embodiment, with the connection line between the midpoint of the front edge of the weakening frame and the midpoint of the rear edge of the weakening frame as the axis of symmetry, the first main reinforcing rib 3, the second main reinforcing rib 4, the first auxiliary reinforcing rib 5, and the second auxiliary reinforcing rib 6 are axially symmetrically distributed. Adopting this symmetrical structural form is for two purposes. On the one hand, it is to ensure the uniform overall force of the inner panel of the engine hood, especially during a frontal collision of the vehicle, to ensure that the inner panel of the engine hood will not be damaged on one side due to different impact forces. On the other hand, this symmetrical structural form has stable structure, simple process, and convenient processing.
[0026] In this embodiment, a plurality of convex platforms 10 are formed at intervals on the edges of the weakening frame 2, the edges of the first main reinforcing rib 3, the edges of the second main reinforcing rib 4, the edges of the first auxiliary reinforcing rib 5, and the edges of the second auxiliary reinforcing rib 6. Annular grooves 11 are formed on the convex platforms 10. Among them, the annular grooves 11 are glue application grooves. The purpose of the convex platforms 10 is mainly to provide support for the annular grooves 11. Glue application operations are carried out in the glue application grooves, so that the inner panel and the outer panel of the engine hood can be connected together by bonding to make the entire engine hood have better stability. At the same time, corresponding forming notches 14 are also made in the edge rounded corner areas of several small regions formed by the weakening frame 2 and the connecting reinforcing ribs. The forming notches 14 are beneficial to reducing the forming defects of the inner panel of the engine hood and also have the function of weakening the inner panel of the engine hood.
[0027] In this embodiment, a plurality of buffer block support features for installing with the outer panel of the engine hood are further provided on the inner panel body 1. The buffer block support features are arranged close to the connection part of the connecting reinforcing rib and the weakening frame. Figure 1As shown, the buffer block support features specifically refer to the installation positioning holes 15 and the lifting positioning holes 16. The installation positioning hole 15 is the installation positioning point between the inner panel of the engine hood and the outer panel of the engine hood, while the lifting positioning hole 16 is the grabbing point of the manipulator during the transfer process or installation process of the inner panel of the engine hood. A certain rigidity and strength are required around the above-mentioned hole positions to avoid deformation due to force during the assembly process, thereby affecting the installation accuracy of the engine hood assembly. Therefore, both the installation positioning hole 15 and the lifting positioning hole 16 are arranged close to the connection between the connecting reinforcing rib and the weakening frame. Specifically, the installation positioning hole 15 is on the same straight line as the second secondary reinforcing rib 6, and the lifting positioning hole 16 is located on the first main reinforcing rib 3 to better play the role of supporting force.
[0028] This embodiment also provides an engine hood, including an outer panel of the engine hood and the above-mentioned inner panel of the engine hood. The inner panel and the outer panel of the engine hood can be combined together by means of flanging, bonding, etc. Since the inner panel of the engine hood in this embodiment has greater strength, it can further ensure that the entire engine hood has greater strength. On the other hand, it can also indirectly ensure the lightweight of the entire engine hood.
[0029] This embodiment also provides a vehicle, including the above-mentioned engine hood.
[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.
Claims
1. An engine hood inner panel, characterized in that: It includes an inner panel body, a weakened window is provided on the inner panel body, and a weakened frame with a step structure is provided at the edge of the weakened window, and connecting reinforcement ribs for strengthening the rigidity of the inner panel body are provided in the weakened frame, and the connecting reinforcement ribs include a first main reinforcement rib and a second main reinforcement rib extending from the front edge to the rear edge of the weakened frame along the length direction of the vehicle body, a first secondary reinforcement rib extending from the left edge of the weakened frame to the first main reinforcement rib along the width direction of the vehicle body, a second secondary reinforcement rib extending from the right edge of the weakened frame to the second main reinforcement rib along the width direction of the vehicle body, and a third secondary reinforcement rib and a fourth secondary reinforcement rib sequentially connected between the first main reinforcement rib and the second main reinforcement rib along the length direction of the vehicle body.
2. The engine hood inner panel according to claim 1, characterized in that: The first main reinforcing rib and the second main reinforcing rib are arranged at intervals in the weakened frame along the width direction of the vehicle body, and the distance between the first main reinforcing rib and the second main reinforcing rib gradually increases from the front edge of the weakened frame to the rear edge of the weakened frame. The first secondary reinforcing rib and the second secondary reinforcing rib extend obliquely backward from the left edge of the weakened frame and the right edge of the weakened frame to the first main reinforcing rib and the second main reinforcing rib respectively. The third secondary reinforcing rib and the fourth secondary reinforcing rib are arranged at intervals between the first main reinforcing rib and the second main reinforcing rib along the length direction of the vehicle body.
3. The engine hood inner panel according to claim 2, characterized in that: The connection point between the first secondary reinforcing rib and the first main reinforcing rib and the connection point between the second secondary reinforcing rib and the second main reinforcing rib are both located between the third secondary reinforcing rib and the fourth secondary reinforcing rib, and the first main reinforcing rib and the second main reinforcing rib are both provided with a collapsed portion in a convex structure at the connection point.
4. The engine hood inner panel according to claim 2, characterized in that: The first main reinforcing rib, the second main reinforcing rib, the first secondary reinforcing rib, the second secondary reinforcing rib, the third secondary reinforcing rib and the fourth secondary reinforcing rib are respectively provided with a plurality of weakened and weight-reducing holes along their length directions, and the weakened and weight-reducing holes are in a long strip structure.
5. The engine hood inner panel according to claim 1, characterized in that: The step structure of the weakened frame is formed by the inner plate body protruding upward along the vehicle body height direction, and a plurality of auxiliary weight-reducing holes are arranged in the edge of the weakened frame, and the auxiliary weight-reducing holes are in a square structure.
6. The engine hood inner panel according to claim 1, characterized in that: Taking the line connecting the midpoint of the front edge of the weakened frame and the midpoint of the rear edge of the weakened frame as the symmetry axis, the first main reinforcing rib and the second main reinforcing rib as well as the first secondary reinforcing rib and the second secondary reinforcing rib are axially symmetrically distributed.
7. The engine hood inner panel according to claim 1, characterized in that: A plurality of bosses arranged at intervals are formed on the edge of the weakened frame, the edge of the first main reinforcing rib, the edge of the second main reinforcing rib, the edge of the first secondary reinforcing rib and the edge of the second secondary reinforcing rib, and an annular groove is formed on the bosses.
8. The engine hood inner panel according to claim 1, characterized in that: The inner panel body is also provided with a plurality of buffer block support features for mounting with the engine hood outer panel, and the buffer block support features are arranged near the connection between the connecting reinforcement rib and the weakened frame.
9. An engine hood, characterized in that: It comprises an engine hood outer panel and an engine hood inner panel according to any one of claims 1-8.
10. A vehicle, characterized in that: Comprising an engine cover according to claim 9.