Pedestrian protection structure of automobile

Abstract

The invention provides an automobile pedestrian protection structure which comprises a supporting plate arranged on an anti-collision cross beam, the supporting plate is of an L-shaped structure, a transverse plate of the supporting plate is fixedly connected with the upper end face of the anti-collision cross beam, and a vertical plate of the supporting plate is arranged opposite to a license plate mounting plate. A plurality of sets of reinforcing plates are fixedly connected between the upper end face of the transverse plate and the rear end face of the vertical plate in parallel. The problem that legs of a vehicle with a U-shaped lamp are bent when a pedestrian is collided due to the fact that the distance between the front bumper and the anti-collision cross beam is too small and no sufficient energy absorption space exists is solved.

Description

Technical Field

[0001] The invention relates to the technical field of automobile manufacturing, and in particular to an automobile pedestrian protection structure. Background Art

[0002] At the same time, with the development of China's automobile industry, various technical indicators and laws and regulations are becoming more and more perfect, and the domestic safety regulations and evaluation standards are being updated and iterated at an increasingly faster speed and with increasing difficulty. The regulations on pedestrian protection will be taken more seriously by the OEMs. Due to the country's strong support for new energy and the rapid rise of new car-making forces, the trend of new energy vehicles is accelerating. This trend not only brings about faster electrification and intelligentization of automobiles, but also has a great impact on the styling style of automobiles. Various technological and futuristic styling designs are reflected in mass-produced vehicles, such as the popular through-type headlights, through-type taillights, and front U-shaped lights. The styling style is completely different from that of traditional vehicles, which brings greater difficulty and challenges to the development of the body structure for pedestrian protection.

[0003] In order to meet the requirements of pedestrian protection regulations, OEMs usually check the shape at the CAS stage, identify the pedestrian protection test area in advance, and avoid the larger risk area. However, some indicators can only be checked with data, such as the distance between the front bumper and the anti-collision beam. Sufficient space is the basis for meeting the leg collision requirements of pedestrian protection regulations. In order to meet pedestrian protection regulations, it is usually not allowed for a rigid body to occupy the energy absorption space between the front anti-collision beam and the front bumper. In the existing structure, when there is a U-shaped lamp on the front bumper of the vehicle, the U-shaped lamp needs to be installed on the anti-collision beam. The distance between the front bumper and the anti-collision beam is too low, and there is no sufficient energy absorption space. The legs will bend in a C shape when they are hit. At this time, it is usually considered to change the shape or the anti-collision beam to increase the energy absorption space to meet the distance requirements from the anti-collision beam to the front bumper, but this change will bring great development costs and a long time period, which is not conducive to the effective advancement of the project. Therefore, it is necessary to invent a vehicle pedestrian protection structure. Summary of the invention

[0004] The purpose of the present invention is to provide a vehicle pedestrian protection structure to solve the problem that the distance between the front bumper and the anti-collision beam of a vehicle with a U-shaped lamp is too low, there is no sufficient energy absorption space, and the legs of pedestrians are bent when they collide with the vehicle.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] A vehicle pedestrian protection structure includes a support plate arranged on an anti-collision beam, wherein the support plate is an L-shaped structure, a transverse plate of the support plate is fixedly connected to the upper end surface of the anti-collision beam, a vertical plate of the support plate is arranged relative to a license plate mounting plate, and a plurality of groups of reinforcing plates are fixedly connected in parallel between the upper end surface of the transverse plate and the rear end surface of the vertical plate.

[0007] Furthermore, the reinforcement plate is a triangular structure.

[0008] Furthermore, the support plate is provided with a plurality of groups of longitudinal reinforcing ribs parallel to the reinforcing plate.

[0009] Furthermore, the longitudinal reinforcing rib is an L-shaped structure and extends from the vertical plate to the transverse plate.

[0010] Furthermore, a plurality of groups of transverse reinforcing ribs are arranged in parallel on the vertical plate, and the reinforcing ribs are arranged alternately with the longitudinal reinforcing ribs.

[0011] Furthermore, a gap of 8 to 12 mm is provided between the front end surface of the vertical plate and the rear end surface of the license plate mounting plate.

[0012] Furthermore, the height of the vertical plate is less than or equal to the height of the license plate mounting plate.

[0013] Furthermore, the transverse plate is provided with a plurality of groups of mounting holes, and is fixedly connected to the upper end surface of the anti-collision beam by bolts.

[0014] Furthermore, the support plate is made of PPT-30 plastic.

[0015] Furthermore, the material thickness of the support plate is at least 2.5 mm.

[0016] Beneficial effects of the present invention: The present invention arranges a support plate behind the license plate mounting plate and connects the support plate to the anti-collision beam. This can well meet the support requirements for the air intake grille assembly without affecting the grille opening ratio, meet the requirements for pedestrian protection, improve the leg injury value in the pedestrian protection regulations, meet the regulatory restrictions with the lowest development cost, and also ensure that other system functions and performances are not affected.

[0017] The present invention will be described in more detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural diagram of the support plate in the present invention.

[0019] Figure 2 This is a structural diagram of the connection between the support plate and the anti-collision beam in the present invention.

[0020] Figure 3 This is a diagram of the matching structure of the support plate, license plate mounting plate, and air intake grille in the present invention. DETAILED DESCRIPTION

[0021] like Figures 1 to 3The vehicle pedestrian protection structure shown includes a support plate 1 arranged on an anti-collision beam 2, wherein the support plate 1 is an L-shaped structure, a transverse plate 11 of the support plate 1 is fixedly connected to the upper end surface of the anti-collision beam 2, a vertical plate 12 of the support plate 1 is arranged relative to a license plate mounting plate 3, and a plurality of groups of reinforcing plates 13 are fixedly connected in parallel between the upper end surface of the transverse plate 11 and the rear end surface of the vertical plate 12.

[0022] Preferably, in combination with the above solution, in order to increase the structural strength of the support plate 1, the reinforcing plate 13 is a triangular structure. Through the force analysis of this structure, when the support plate 1 is only an L-shaped structure, the supporting effect in the X direction is small, and it will still have a large deformation with the grille in the CAE analysis, so several groups of reinforcing plates 13 are added behind the support plate to enhance the structural strength here.

[0023] Preferably, in combination with the above solution, in order to strengthen the plate itself, the support plate 1 is provided with a plurality of groups of longitudinal reinforcing ribs 14 parallel to the reinforcing plate 13 .

[0024] Preferably, in combination with the above solution, in order to strengthen the entire plate, the longitudinal reinforcing ribs 14 are L-shaped structures and extend from the vertical plate 12 to the transverse plate 11 .

[0025] Preferably, in combination with the above solution, in order to strengthen the vertical plate 12 , a plurality of groups of transverse reinforcing ribs 15 are arranged in parallel on the vertical plate 12 , and the reinforcing ribs 15 are arranged alternately with the longitudinal reinforcing ribs 14 .

[0026] Preferably, in combination with the above solution, a gap of 8 to 12 mm is provided between the front end face of the vertical plate 12 and the rear end face of the license plate mounting plate 3. The reserved gap facilitates assembly and prevents the vertical plate 12 from causing friction noise due to being close to the license plate mounting plate 3.

[0027] Preferably, in combination with the above solution, the height of the vertical plate 12 is less than or equal to the height of the license plate mounting plate 3. By designing this structure, the support requirements for the air intake grille 4 are met without affecting the opening ratio of the air intake grille 4, and the thermal management performance is not affected, and the pedestrian protection performance requirements can be met. In addition, the vertical plate 12 is as high as possible without affecting the opening ratio and the thermal management performance, so as to ensure the normal posture of the upper half of the leg shape, which can effectively avoid the C-shaped bending of the leg during a collision.

[0028] Preferably, in combination with the above solution, in order to facilitate assembly and disassembly and maintenance, the transverse plate 11 is provided with a plurality of mounting holes, and is fixedly connected to the upper end surface of the anti-collision beam 2 by bolts.

[0029] Preferably, in combination with the above solution, the support plate 1 is made of PPT-30 plastic.

[0030] Preferably, in combination with the above solution, the material thickness of the support plate 1 is at least 2.5 mm. In the CAE simulation calculation process, the relationship between the support function and the material thickness strength is matched, and the minimum material thickness that can meet the performance requirements is determined to be 2.5 mm, which can reduce the performance redundancy and cost and weight increase caused by excessive material thickness.

[0031] In the case of new energy vehicles without U-shaped lights, the front grille assembly is relatively soft overall and will not cause excessive damage to pedestrians' legs. However, due to the installation of U-shaped lights, the U-shaped lights are fixed on the anti-collision beam on the rear side of the front bumper, the front bumper and the air intake grille are fixed on the U-shaped lights, and the front bumper is provided with a lamp slot for the light to pass through. The distance between the front bumper and the anti-collision beam is too low, and there is no sufficient energy absorption space. As a result, the air intake grille assembly is relatively soft above and below the knee, but relatively hard at the knee. When the leg is hit, it will bend in a C shape. At this time, the simulated calculation value of the ACL (dynamic extension of the anterior cruciate ligament of the knee) at the knee is 16.2mm, far exceeding the regulatory limit of 13mm.

[0032] At this time, it is usually considered to change the structural shape or anti-collision beam structure to increase the energy absorption space to meet the distance requirements from the anti-collision beam to the front bumper, but this will bring huge development costs and a long time period, which is not conducive to the effective advancement of the project. Under the condition that the existing boundaries remain unchanged, based on the experience of road bumper development, the following two feasible solutions are considered: one is to add a calf protection beam to ensure the normal posture of the lower half of the leg; the second is to strengthen the grille to ensure the normal posture of the upper half of the leg; the third is that when the effects of plan one and plan two are not obvious, only two plans can be added at the same time and the strength is matched to ensure the normal posture of the entire leg.

[0033] After CAE analysis, it was found that after adding the calf protection beam, the upper leg area would be bounced, so that the ACL value would not only not be improved, but would become worse; the second solution added the air intake grille support plate of the present invention, which could well reduce the ACL value, so this solution was the main optimization direction; when the second solution was confirmed to be more effective, in order to reduce the cost and weight of the single vehicle, the analysis and matching of the third solution was not performed.

[0034] Through the above design and multiple rounds of structural optimization and simulation analysis, all indicators in the pedestrian protection leg test area are qualified, and a certain safety margin is left. After process analysis, it is finally confirmed that the optimization scheme of the present invention can not only meet the requirements of pedestrian protection regulations, but also has no effect on other performance. Therefore, it is confirmed that the optimization scheme can be implemented.

[0035] In the description of the present invention, it is necessary to understand that terms such as "upper", "lower", "front", "back", "left", "right", "bottom", "inside", "outside", "one end", "one side", "two ends", "both sides", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0036] 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 made by adopting the method concept and technical solution of the present invention, or directly applied to other occasions, they all fall within the protection scope of the present invention.

Claims

1. A vehicle pedestrian protection structure, characterized in that: The invention comprises a support plate (1) arranged on an anti-collision beam (2), wherein the support plate (1) is an L-shaped structure, a transverse plate (11) of the support plate (1) is fixedly connected to the upper end surface of the anti-collision beam (2), a vertical plate (12) of the support plate (1) is arranged relative to a license plate mounting plate (3), and a plurality of groups of reinforcing plates (13) are fixedly connected in parallel between the upper end surface of the transverse plate (11) and the rear end surface of the vertical plate (12).

2. The vehicle pedestrian protection structure according to claim 1, characterized in that: The reinforcing plate (13) is a triangular structure.

3. The vehicle pedestrian protection structure according to claim 1, characterized in that: The support plate (1) is provided with a plurality of groups of longitudinal reinforcing ribs (14) parallel to the reinforcing plate (13).

4. The vehicle pedestrian protection structure according to claim 3, characterized in that: The longitudinal reinforcing rib (14) is an L-shaped structure and extends from the vertical plate (12) to the transverse plate (11).

5. The vehicle pedestrian protection structure according to claim 4, characterized in that: A plurality of groups of transverse reinforcing ribs (15) are also arranged in parallel on the vertical plate (12), and the reinforcing ribs (15) and the longitudinal reinforcing ribs (14) are arranged in an alternating manner.

6. The vehicle pedestrian protection structure according to claim 1, characterized in that: A gap of 8 to 12 mm is provided between the front end surface of the vertical plate (12) and the rear end surface of the license plate mounting plate (3).

7. The vehicle pedestrian protection structure according to claim 1, characterized in that: The height of the vertical plate (12) is less than or equal to the height of the license plate mounting plate (3).

8. The vehicle pedestrian protection structure according to claim 1, characterized in that: The transverse plate (11) is provided with a plurality of groups of mounting holes and is fixedly connected to the upper end surface of the anti-collision beam (2) by means of bolts.

9. The vehicle pedestrian protection structure according to claim 1, characterized in that: The support plate (1) is made of PPT-30 plastic.

10. The vehicle pedestrian protection structure according to claim 9, characterized in that: The material thickness of the support plate (1) is at least 2.5 mm.

Images