Bottom guard plate supporting structure of automobile front bumper

Abstract

A bottom guard plate supporting structure of an automobile front bumper belongs to the technical field of automobile parts and comprises a bottom guard plate body, one end of the bottom guard plate body is connected with the front bumper in a clamping and positioning mode, and the middle of the bottom guard plate body is detachably connected with an auxiliary anti-collision beam. The device is simple in structure, convenient and fast to mount and dismount, light in weight and capable of balancing pedestrians to protect the Flex leg type and the aPLI leg type, and can meet the requirements of domestic and foreign laws and regulations as well as the C-NCAP star-level requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile parts, in particular to a supporting structure of an underbody guard plate of an automobile front bumper. Background Art

[0002] The number of cars in China has increased rapidly with the rapid development of China's economy, and the rapid growth of cars has also led to an increase in traffic accidents, especially pedestrians, who are a vulnerable group and are the main casualties in traffic accidents. How to reduce the casualties of pedestrians in traffic accidents has become a hot research topic in the field of automobile safety, and reducing casualties through reasonable design of front bumpers has also become a key research content.

[0003] In non-fatal car-pedestrian collision accidents, 40% of pedestrian leg injuries occur. The injuries to the legs are mainly tibia fractures, ligament tears, and knee injuries. Although these injuries cannot directly lead to the death of pedestrians, they will cause permanent and irreversible injuries to pedestrians, causing patients to suffer for life. Therefore, in traffic accidents involving pedestrians and cars, how to reduce leg and ligament injuries is of great significance for reducing accident losses and reducing the damage to pedestrians in accidents.

[0004] China's New Car Assessment Program (C-NCAP) will replace the original Flex leg type with the aPLI leg type with better bio-realism in 2021. In July 2024, my country will implement regulations on the collision of vehicles with pedestrians, and the leg type involves the Flex leg type. Therefore, the study of how to balance the Flex leg type and the aPLI leg type is particularly important for current and later models.

[0005] For example, the patent with publication number CN107244357A discloses a bumper bottom guard plate mounting bracket, which includes a bracket body for mounting the bumper bottom guard plate on the rear inner panel, and a first mounting point is formed on the bracket body for corresponding to the anti-collision beam mounting point on the rear inner panel. However, the installation of the above-mentioned bumper bottom guard plate is relatively complicated, and it cannot solve the technical problem of how to balance the pedestrian protection Flex leg type and the aPLI leg type proposed by the utility model. Utility Model Content

[0006] In order to solve the above technical problems, the utility model provides a support structure for the bottom guard plate of the front bumper of an automobile. The structure is simple, the installation and disassembly is convenient and quick, the weight is light, and the pedestrian protection Flex leg type and the aPLI leg type can be balanced. The structure can meet the requirements of domestic and foreign regulations and the C-NCAP star requirements.

[0007] To achieve the above-mentioned purpose, the technical solution adopted by the utility model to solve its technical problem is: the automobile front bumper bottom guard plate support structure includes a bottom guard plate body, one end of the bottom guard plate body is connected to the front bumper by clamping and positioning, and the middle part of the bottom guard plate body is detachably connected to the auxiliary anti-collision beam.

[0008] The bottom guard plate body is made of glass fiber reinforced polypropylene material, and the material thickness of the bottom guard plate body is 2 to 4 mm.

[0009] One end of the bottom guard plate body is connected to the front bumper by clamping and positioning along the X direction.

[0010] The longitudinal section of the bottom guard plate body is set to be L-shaped, and the front end of the bottom guard plate body is set to be a vertical edge, and the vertical edge is connected to the lower edge of the front bumper along the X direction.

[0011] The front end of the bottom guard plate body is provided with a plurality of installation positions fixedly connected to the front bumper at intervals along its length direction.

[0012] The installation position includes a positioning hole and a mounting hole I. The lower edge of the front bumper is provided with a positioning pin that matches the corresponding positioning hole and a mounting hole II opposite to the mounting hole I. The mounting hole I and the mounting hole II are connected by connecting bolts.

[0013] A Z-direction limiting boss is arranged on the inner side of the bottom guard plate body along its length direction, and the Z-direction limiting boss is connected to the auxiliary anti-collision beam for positioning in the Z direction.

[0014] A plurality of mounting columns are arranged on the Z-direction limiting boss at intervals along its length direction, and the mounting columns are connected to the auxiliary anti-collision beam through connecting bolts.

[0015] The mounting column is provided with staggered transverse reinforcing ribs and longitudinal reinforcing ribs along its circumference.

[0016] The front end of the bottom guard plate body matches the lower edge of the front bumper, and the front end of the bottom guard plate body is provided with a plurality of Z-direction reinforcing ribs and a plurality of weakened holes at intervals along its length direction.

[0017] The beneficial effects of the utility model are:

[0018] 1. The utility model effectively prevents the bottom of the front bumper from sinking by installing a bottom guard plate between the front bumper and the secondary anti-collision beam, improves the supporting rigidity of the bottom of the vehicle body, reduces the elongation of the Flex leg ligament, and ensures that the requirements of domestic and foreign laws and regulations on pedestrian protection are met; and by connecting the bottom guard plate to the front bumper through a snap connection, the bottom guard plate and the secondary anti-collision beam are detachably connected, making the installation and removal of the bottom guard plate more convenient.

[0019] 2. The bottom guard plate body in the utility model is fixedly connected to the front bumper and the auxiliary anti-collision beam. Transverse reinforcement ribs and longitudinal reinforcement ribs are arranged at the connection between the bottom guard plate body and the front bumper. Z-direction reinforcement ribs are arranged at the front end of the bottom guard plate body to ensure the support and connection stiffness of the bottom guard plate. In addition, the bottom guard plate body is made of glass fiber reinforced polypropylene material with a material thickness of 2 to 4 mm. The overall weight is relatively light, which has little effect on the weight of the whole vehicle and increases the toughness of the entire bottom guard plate, thereby reducing the peak value of the aPLI leg-type calf bending moment and ensuring that it is within the C-NCAP bending moment limit and meets the C-NCAP star requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The following is a brief description of the contents expressed in each of the drawings of the utility model specification and the marks in the drawings:

[0021] Figure 1 It is a top view of the bottom guard plate body of the utility model;

[0022] Figure 2 This is an axonometric view of the bottom guard plate body of the utility model installed on the auxiliary anti-collision beam;

[0023] Figure 3 This is an axonometric view of the bottom guard plate body of the utility model installed on the front bumper;

[0024] Figure 4 for Figure 3 A magnified view of the middle bottom guard plate body and the front bumper;

[0025] Figure 5 It is a schematic diagram of the collision of the Flex leg of the bottom guard plate support structure of the utility model;

[0026] Figure 6 It is a schematic diagram of the aPLI leg collision of the bottom guard plate support structure of the utility model;

[0027] The markings in the above figures are: 1. Bottom guard plate body, 11. Vertical edge, 12. Positioning hole, 13. Mounting hole I, 14. Z-direction limiting boss, 15. Mounting column, 16. Horizontal reinforcement rib, 17. Longitudinal reinforcement rib, 18. Z-direction reinforcement rib, 19. Weakened hole, 2. Front bumper, 3. Auxiliary anti-collision beam. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.

[0029] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] The specific implementation scheme of the utility model is as follows: Figure 1 to Figure 6 As shown, the utility model provides a supporting structure for the bottom guard plate of a front bumper of an automobile, comprising a bottom guard plate body 1, one end of the bottom guard plate body 1 being connected to the front bumper 2 by clamping and positioning, and the middle part of the bottom guard plate body 1 being detachably connected to a secondary anti-collision beam 3 installed on the longitudinal beam of the vehicle body, thereby effectively preventing the bottom of the front bumper 2 from sinking, improving the supporting stiffness of the bottom of the vehicle body, reducing the elongation of the Flex leg ligament, ensuring that the requirements of domestic and foreign laws and regulations on pedestrian protection are met, and making the installation and removal of the bottom guard plate more convenient.

[0032] Specifically, the bottom guard plate body 1 is made of glass fiber reinforced polypropylene material, and PP-GF30 material can be selected. The material thickness of the bottom guard plate body 1 is 2 to 4 mm, and its specific thickness can be set according to needs. The overall weight is relatively light, which has little impact on the weight of the vehicle and increases the toughness of the entire bottom guard plate.

[0033] Specifically, one end of the bottom guard plate body 1 is connected to the front bumper 2 in the X direction (the length direction of the vehicle body) by clamping. That is, the longitudinal section of the bottom guard plate body 1 is set to be L-shaped, and the front end of the bottom guard plate body 1 is set to be a vertical edge 11, and the vertical edge 11 is connected to the lower edge of the front bumper 2 in the X direction by clamping. The clamping structure can be set to a concave-convex structure, so as to achieve the X-direction limit of the bottom guard plate body 1.

[0034] The front end of the bottom guard plate body 1 is provided with a plurality of mounting positions fixedly connected to the front bumper 2 at intervals along its length direction, and the mounting positions include positioning holes 12 and mounting holes Ⅰ13. The lower edge of the front bumper 2 is provided with positioning pins matching the corresponding positioning holes 12 and mounting holes Ⅱ opposite to the mounting holes Ⅰ13. The mounting holes Ⅰ13 and Ⅱ are connected with each other by connecting bolts, thereby realizing the Y-direction limitation of the bottom guard plate body 1.

[0035] Specifically, a Z-direction limiting boss 14 is provided inside the bottom guard plate body 1 along its length direction, and the Z-direction limiting boss 14 is connected to the auxiliary anti-collision beam 3 for positioning in the Z direction. A plurality of mounting posts 15 are provided on the Z-direction limiting boss 14 along its length direction at intervals, and the mounting posts 15 are connected to the auxiliary anti-collision beam 3 through connecting bolts, thereby realizing the Z-direction limiting of the bottom guard plate body 1. In order to ensure the structural strength of the bottom guard plate body 1 when it is installed on the auxiliary anti-collision beam 3, the mounting posts 15 are provided with staggered transverse reinforcing ribs 16 and longitudinal reinforcing ribs 17 along their circumference.

[0036] In addition, the front end of the bottom guard plate body 1 matches the lower edge of the front bumper 2, and the front end of the bottom guard plate body 1 is provided with a plurality of Z-direction reinforcing ribs 18 and a plurality of weakened holes 19 at intervals along its length direction, wherein the size and position of the Z-direction reinforcing ribs 18 and the weakened holes 19 can be set as required. The provision of the Z-direction reinforcing ribs 18 can further improve the structural strength and stability of the installation of the bottom guard plate body 1 and the secondary anti-collision beam 3, and the provision of the weakened holes 19 can ensure the energy absorption effect of the bottom guard plate body 1.

[0037] The working principle of the above-mentioned underbody guard support structure is as follows: when the Flex leg impactor hits the whole vehicle, the Flex leg impactor first hits the front bumper 2, and the force is transmitted to the underbody guard body 1 through the front bumper 2. The underbody guard body 1 absorbs energy by deformation, plays a supporting role, supports the lower leg of Flex, and reduces the peak value of the overall ligament elongation MCL of the Flex leg, so that the ligament elongation MCL meets the regulatory requirements; when the aPLI leg impactor hits the whole vehicle, the aPLI leg impactor first hits the front bumper 2, and the front bumper 2 transmits force to the underbody guard body 1. The underbody guard body 1 deforms and absorbs energy, plays a supporting role, supports the lower leg of aPLI, and makes the aPLI ligament elongation meet the regulatory requirements. During the impact, the underbody guard body 1 deforms, so that the aPLI calf has sufficient buffering energy absorption space, ensuring that its calf bending moment peak is less than the limit specified in the C-NCAP regulations, and the overall C-NCAP score requirements are met.

[0038] In summary, the utility model effectively prevents the sinking of the bottom of the front bumper 2 by installing a bottom guard plate between the front bumper 2 and the auxiliary anti-collision beam 3, thereby improving the supporting stiffness of the bottom of the vehicle body, reducing the elongation of the Flex leg ligament, and ensuring that the requirements of domestic and foreign laws and regulations on pedestrian protection are met; and by making the bottom guard plate and the front bumper 2 snap-connected and the bottom guard plate and the auxiliary anti-collision beam 3 detachably connected, the installation and disassembly of the bottom guard plate is more convenient.

[0039] The bottom guard plate body 1 is fixedly connected to the front bumper 2 and the auxiliary anti-collision beam 3. Transverse reinforcement ribs 16 and longitudinal reinforcement ribs 17 are arranged at the connection between the bottom guard plate body 1 and the front bumper 2. Z-direction reinforcement ribs 18 are arranged at the front end of the bottom guard plate body 1 to ensure the support and connection stiffness of the bottom guard plate. In addition, the bottom guard plate body 1 is made of glass fiber reinforced polypropylene material with a material thickness of 2 to 4 mm. The overall weight is relatively light, which has little effect on the weight of the vehicle and increases the toughness of the entire bottom guard plate, thereby reducing the peak value of the aPLI leg-type calf bending moment and ensuring that it is within the C-NCAP bending moment limit and meets the C-NCAP star requirements.

[0040] Therefore, the above-mentioned automobile front bumper bottom guard plate support structure is simple, installation and disassembly are convenient and quick, light weight, and can balance the pedestrian protection Flex leg type and aPLI leg type, which can meet both domestic and foreign regulatory requirements and C-NCAP star requirements.

[0041] The above description is only used to illustrate some principles of the utility model. This specification is not intended to limit the utility model to the specific structure and application scope shown and described. Therefore, all corresponding modifications and equivalents that may be used belong to the patent scope applied for the utility model.

Claims

1. A car front bumper bottom guard plate support structure, characterized in that: It comprises an underbody guard plate body, one end of which is connected to the front bumper by clamping and positioning, and the middle part of the underbody guard plate body is detachably connected to the auxiliary anti-collision beam.

2. The automobile front bumper bottom guard plate support structure according to claim 1, characterized in that: The bottom guard plate body is made of glass fiber reinforced polypropylene material, and the material thickness of the bottom guard plate body is 2 to 4 mm.

3. The automobile front bumper bottom guard plate support structure according to claim 1, characterized in that: One end of the bottom guard plate body is connected to the front bumper by clamping and positioning along the X direction.

4. The automobile front bumper bottom guard plate support structure according to claim 3, characterized in that: The longitudinal section of the bottom guard plate body is set to be L-shaped, and the front end of the bottom guard plate body is set to be a vertical edge, and the vertical edge is connected to the lower edge of the front bumper along the X direction.

5. The automobile front bumper bottom guard plate support structure according to claim 3, characterized in that: The front end of the bottom guard plate body is provided with a plurality of installation positions fixedly connected to the front bumper at intervals along its length direction.

6. The automobile front bumper bottom guard plate support structure according to claim 5, characterized in that: The installation position includes a positioning hole and a mounting hole I. The lower edge of the front bumper is provided with a positioning pin that matches the corresponding positioning hole and a mounting hole II opposite to the mounting hole I. The mounting hole I and the mounting hole II are connected by connecting bolts.

7. The automobile front bumper bottom guard plate support structure according to claim 1, characterized in that: A Z-direction limiting boss is arranged on the inner side of the bottom guard plate body along its length direction, and the Z-direction limiting boss is connected to the auxiliary anti-collision beam for positioning in the Z direction.

8. The automobile front bumper bottom guard plate support structure according to claim 7, characterized in that: A plurality of mounting columns are arranged on the Z-direction limiting boss at intervals along its length direction, and the mounting columns are connected to the auxiliary anti-collision beam through connecting bolts.

9. The automobile front bumper bottom guard plate support structure according to claim 8, characterized in that: The mounting column is provided with staggered transverse reinforcement ribs and longitudinal reinforcement ribs along its circumference.

10. The automobile front bumper bottom guard plate support structure according to claim 1, characterized in that: The front end of the bottom guard plate body matches the lower edge of the front bumper, and the front end of the bottom guard plate body is provided with a plurality of Z-direction reinforcing ribs and a plurality of weakened holes at intervals along its length direction.

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