Middle support structure and connecting structure of front bumper and front anti-collision beam

Abstract

The invention discloses a middle support structure and a connecting structure of a front bumper and a front anti-collision beam, which are characterized by comprising an upper supporting surface supported on the upper end surface of the front anti-collision beam, the upper supporting surface is connected with a lower limiting surface through a connecting mounting surface, and the lower limiting surface is an inclined surface; the lower limiting face is inserted into a limiting groove formed in the rear portion of the front anti-collision cross beam. The middle support structure and the connecting structure of the front bumper and the front anti-collision cross beam are simple in structure and convenient to install, deformation of the front bumper can be effectively prevented, the leg protection score of pedestrians is increased, and high practicability and good application prospects are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of automobiles, and more specifically, relates to a middle support structure and a connection structure between a front bumper and a front anti-collision beam. Background Art

[0002] In recent years, with the continuous advancement of automobile manufacturing technology, automobile safety measures have been increasingly improved, which has greatly improved driving safety and occupant protection. However, pedestrians are often the largest group of victims in road traffic accidents. According to statistical analysis, pedestrian casualties account for about 30% of the total number of casualties. Therefore, it is of great significance to carry out collision analysis research on pedestrian safety, which is also the unshirkable responsibility of collision safety developers.

[0003] In the development process of passive safety pedestrian protection, in addition to meeting mandatory inspection regulations, it is also necessary to meet development goals such as star rating, and the pedestrian protection score rate directly affects the overall star rating. Therefore, in order to get a good score, the total score of the head and legs of the pedestrian protection needs to meet the design definition target. However, due to vehicle styling issues, the head score is usually subject to a score ceiling, and it is impossible to get a very high score through styling or engineering optimization; and when the head score is constrained by the styling design style, it is necessary to increase the leg score to make up for the score loss caused by the styling design constraints. However, the concept of pedestrian protection development is to weaken the safety of pedestrians outside the vehicle as much as possible, and this conflicts with design concepts such as durability and reliability of vehicle components.

[0004] "Pedestrian protection", as the name implies, aims to protect pedestrians. It is a major direction of passive safety research, including all measures designed specifically for cars to reduce the damage to external personnel caused by cars in accidents. Through the analysis of accidents, it is found that in most human-vehicle collision accidents, the human body collides with the front of the vehicle. In about 2 / 3 of human-vehicle collision accidents, the collision speed between pedestrians and vehicles is less than 40km / h. Therefore, the current C-NCAP management rules and C-IASI management methods both clearly require that the collision speed be 40km / h in the pedestrian protection collision condition. Therefore, the present invention is also based on the pedestrian protection analysis at 40km / h.

[0005] Through analysis, it was found that due to the weight of the front bumper itself and the lack of Z-direction support in the middle part of the front bumper, it will sag and deform during long-term use, which directly increases the rigid structural support. The front bumper and the front anti-collision beam are mostly rigidly connected, which cannot meet the passive safety pedestrian protection requirements. Summary of the invention

[0006] The purpose of the present invention is to solve the problems existing in the prior art and to provide a middle bracket structure and a connection structure between the front bumper and the front anti-collision beam which are simple in structure, easy to install, can effectively prevent the front bumper from deforming, and increase the pedestrian leg protection score.

[0007] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: the provided middle bracket structure is characterized in that it includes an upper supporting surface supported on the upper end surface of the front anti-collision beam, the upper supporting surface is connected to the lower limit surface through a connecting mounting surface, the lower limit surface is an inclined surface, and the lower limit surface is inserted into a limit groove arranged behind the front anti-collision beam.

[0008] In order to make the above technical solution more detailed and specific, the present invention also provides the following further preferred technical solutions to obtain satisfactory practical effects:

[0009] A front bumper mounting buckle is provided at the front end of the upper support surface and is mounted on the front bumper from rear to front.

[0010] The front bumper is provided with a hook corresponding to the front bumper installation buckle, and the front bumper installation buckle includes a buckle body and a tongue.

[0011] The buckle body is a frame-shaped structure connected to the front edge of the upper support surface, the latch tongue is arranged in the middle of the buckle body, one end of the latch tongue is connected to the front edge of the upper support surface, and the other end is an open clamping end, and a downwardly protruding clamping block is provided on the latch tongue.

[0012] The middle support structure is provided with a plurality of front bumper installation buckles arranged at intervals in the width direction of the vehicle body, and a lap plate which is overlapped on the front bumper during installation is provided between adjacent front bumper installation buckles.

[0013] The connecting and mounting surface is formed by the rear end edge of the upper supporting surface extending downward along the rear end surface of the front anti-collision beam, and the lower limiting surface is inclined from the lower end edge of the connecting and mounting surface toward the front anti-collision beam and extends into the limiting groove.

[0014] The angle between the lower limit surface and the connection installation surface is 110 degrees to 130 degrees, and the gap between the lower end of the lower limit surface and the bottom surface of the limit groove of the front anti-collision beam is 2mm to 5mm.

[0015] A support hole is provided on the connection and installation surface, and a threaded hole corresponding to the support hole is provided on the front anti-collision beam, and a mounting screw passes through the support hole and is connected to the threaded hole.

[0016] The diameter of the supporting hole is larger than the diameter of the mounting screw, and the mounting screw is provided with a mounting gasket with a diameter larger than the diameter of the supporting hole.

[0017] A connection structure between a front bumper and a front anti-collision beam is connected by using the middle bracket structure.

[0018] Compared with the prior art, the present invention has the following advantages: the middle bracket structure and the connection structure between the front bumper and the front anti-collision beam of the present invention are simple in structure and easy to install, can effectively prevent the front bumper from deforming, increase the pedestrian leg protection score, and have strong practicality and good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The following is a brief description of the contents and symbols in the drawings of this specification:

[0020] Figure 1 This is a schematic diagram of the structure of the middle bracket of the present invention;

[0021] Figure 2 This is a schematic diagram of the force structure of the middle bracket in the X direction of the present invention;

[0022] Figure 3 It is a schematic diagram of the connection structure between the front bumper and the front anti-collision beam of the present invention;

[0023] Figure 4 It is a cross-sectional schematic diagram of the connection structure between the front bumper and the front anti-collision beam of the present invention.

[0024] The figures are marked as: 10, middle bracket;

[0025] 101, upper support surface; 102, connection and installation surface; 1021, support hole; 103, lower limit surface; 104, front protection installation buckle; 1041, buckle body; 1042, tongue;

[0026] 20. Front bumper; 30. Front anti-collision beam; 40. Mounting screws; 50. Mounting gasket. DETAILED DESCRIPTION

[0027] The specific implementation modes of the present invention will be further explained in detail below through the description of embodiments with reference to the accompanying drawings.

[0028] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0029] The middle support structure of the present invention is as follows: Figure 1 , 2As shown in Figure 3, the middle bracket 10 includes an upper support surface 101 supported on the upper end surface of the front anti-collision beam 30, and the upper support surface 101 is connected to the lower limit surface 103 through the connecting mounting surface 102. The lower limit surface 103 is an inclined surface, and the lower limit surface 103 is inserted into the limit groove arranged behind the front anti-collision beam 30. The middle bracket structure utilizes the self-weight force of the front bumper in the Z direction and uses the front anti-collision beam as a lever support point to meet the Z-direction support function of the front anti-collision beam. At the same time, there is no fixed constraint between the middle bracket and the front anti-collision beam to meet the pedestrian protection requirements for buffering deformation of the front bumper and the front anti-collision beam bracket. The middle bracket has a simple structure and is easy to install. It can effectively prevent the deformation of the front bumper and increase the leg protection score of pedestrians.

[0030] In the present invention, the front end of the upper support surface 101 is provided with a front bumper mounting buckle 104 which is mounted on the front bumper 20 from the back to the front. The front bumper 20 is provided with a corresponding hook which is mounted on the front bumper mounting buckle 104. The front bumper mounting buckle 104 includes a buckle body 1041 and a tongue 1042. Figure 4 The cross section and Figure 1 As shown in . The buckle body 1041 is a frame-shaped structure connected to the front edge of the upper support surface 101, and the clamping tongue 1042 is arranged in the middle of the buckle body 1041. One end of the clamping tongue 1042 is connected to the front edge of the upper support surface 101, and the other end is an open clamping end. A downwardly protruding clamping block is arranged on the clamping tongue 1042. During installation, the open clamping end is installed on the front bumper 20, the clamping hook is clamped downwardly to the frame-shaped buckle body 1041, the clamping tongue 1042 is located at the top, and the downwardly protruding clamping block is clamped in the clamping groove on the front bumper 20, so as to realize the positioning installation of the middle bracket 10 and the front bumper 20.

[0031] In the present invention, Figure 1 , 2 As shown in Figures 3 and 4, the structure of the middle bracket 10 is provided with a plurality of front bumper mounting buckles 104 arranged at intervals in the width direction of the vehicle body, and a lap plate is provided between adjacent front bumper mounting buckles to overlap the front bumper during installation. The plurality of front bumper mounting buckles 104 can ensure the stable installation of the middle bracket 10, and the lap plate is provided to cooperate with the clamping structure. When a collision occurs, the structure moves backwards smoothly, freeing up space and reducing pedestrian injuries.

[0032] In the present invention, Figure 2 As shown in the figure, the connecting and mounting surface 102 is formed by the rear end edge of the upper supporting surface 101 extending downward along the rear end surface of the front anti-collision beam 30, and the lower limit surface 103 is inclined toward the front anti-collision beam 30 from the lower end edge of the connecting and mounting surface 102 and extends into the limit groove.

[0033] In the present invention, Figure 4As shown in , the angle between the lower limit surface 103 and the connection and installation surface 102 is 110-130 degrees, and the gap between the lower end of the lower limit surface 103 and the bottom surface of the limit groove of the front anti-collision beam 30 is 2mm-5mm. Affected by the gravity of the front bumper 20, the middle bracket 10 will be squeezed downward. At the same time, due to the role of the lever support point played by the front anti-collision beam 30, the middle bracket of the present invention will rotate around the front anti-collision beam 30. This inclination angle and small gap setting can effectively prevent the support deformation between the components, and can also ensure that the middle bracket will interfere with the anti-collision beam during the rotation process around the front anti-collision beam, which can prevent the middle bracket structure from continuing to rotate and disengage.

[0034] The present invention provides a connection structure between a front bumper and a front anti-collision beam, which is connected by the above-mentioned middle bracket structure. This structure can effectively prevent the front bumper from deforming, support the bumper, and take safety into consideration, thereby increasing the pedestrian leg protection score and better meeting the use requirements.

[0035] In the traditional front bumper, the middle bracket is connected to the front anti-collision beam by multiple bolts to ensure that the middle bracket supports the front bumper in the Z direction, but it cannot play a good role in pedestrian protection. Affected by the gravity of the front bumper 20, the middle bracket 10 will be squeezed downward. At the same time, due to the role of the lever support point played by the front anti-collision beam 30, the middle bracket of the present invention will rotate around the front anti-collision beam 30. The present invention designs the lower limit surface 103 to be inclined and open, with an opening greater than 110°, and controls the gap between the limit groove of the front anti-collision beam 30 to be 3mm. This small gap setting can effectively prevent support deformation between components, and can also ensure that the middle bracket will interfere with the anti-collision beam during the rotation process around the front anti-collision beam, and can prevent the middle bracket structure from continuing to rotate and disengage. In addition, as the vehicle is used for a long time, the front bumper becomes more deformed due to plastic deformation, and the accumulation of dust and mud on the bumper causes the middle bracket structure to bear a greater weight of the front bumper. This will cause the interference and friction between the middle bracket structure of the present invention and the front anti-collision beam to deepen, thereby effectively preventing the front bumper from sagging and ensuring the reliable use of the middle bracket of the front bumper.

[0036] To further ensure that the present invention, the front bumper assembly, and the front anti-collision beam can withstand the 5000km enhanced durability harsh verification, in the present invention, the connection and installation surface 102 is provided with a support hole 1021, the front anti-collision beam 30 is provided with a threaded hole corresponding to the support hole 1021, and the mounting screw 40 passes through the support hole 1021 and is connected to the threaded hole. The diameter of the support hole 1021 is larger than the diameter of the mounting screw 40, and the mounting screw 40 is provided with a mounting gasket 50 having a diameter larger than the diameter of the support hole 1021.

[0037] like Figure 2 As shown, the present invention provides an embodiment, wherein the middle bracket 10 and the front anti-collision beam 30 are fixedly connected by means of three mounting screws 40 with a diameter of 4.8 mm and a thread length of 16 mm and three plastic discs with a thickness of 2.5 mm and a diameter of 30 mm as mounting gaskets 50. The mounting screw 40 passes through the support hole 1021 and is connected to the threaded hole. The diameter of the support hole 1021 is larger than the diameter of the mounting screw 40. The mounting screw 40 is provided with a mounting gasket 50 with a diameter larger than the diameter of the support hole 1021. Here, the support hole 1021 plays a supporting role and is not threadedly connected. When subjected to a certain X-direction collision force, the front bumper can move backward to reduce pedestrian damage.

[0038] like Figure 2 As shown, when the front anti-collision beam 30 is subjected to the impact force in the horizontal X direction, the force will be transmitted to the middle bracket 10 due to the connection between the middle bracket 10 and the front bumper 20. However, since the middle bracket 10 of the present invention and the front anti-collision beam 30 have no bolt connection constraint in the front direction of the vehicle, and are only overlapped in the Z direction, the middle bracket 10 of the present invention will not be constrained from moving backward and transmitting the front direction of the vehicle (i.e., the collision force in the X direction). When the collision force in the X direction exceeds 6KN (the 6KN value is obtained for the TRL axial force *08 in the E-NCAP evaluation protocol), the installation gasket 50 is broken to release the fixed constraint relationship between the middle bracket 10 and the front anti-collision beam 30. In order to ensure that the front bumper 20 and the middle bracket 10 can move in the X direction without being hindered by the threaded connection between the mounting screws and the front anti-collision beam, a support hole 1021 with a diameter larger than the diameter of the mounting screw is provided on the middle bracket 10. The purpose is that when the mounting gasket 50 fails and breaks, the mounting screws and the front anti-collision beam are still in a threaded fixed connection, and the middle bracket 10 can be restrained by the screw cap, so that the front bumper and the middle bracket 10 can move backwards in the event of a serious pedestrian collision, thereby freeing up space and reducing pedestrian injuries.

[0039] By comparing the test results in Table 1, the middle bracket structure of the present invention can effectively improve the pedestrian protection leg score compared with the traditional fixed design, thereby reducing the constraints on the shape of pedestrian protection development. The following table shows the pedestrian leg protection test results:

[0040]

[0041]

[0042] The front bumper is a plastic part. During long-term use, the plastic will be stretched and deformed due to heat and force, which will eventually cause the matching gap between the front bumper and the front bumper in the Z direction to become larger and larger. However, this change will cause customers to worry about safety during later use, so such problems should be eliminated during vehicle development. Therefore, in order to prevent the above situation, the middle bracket is installed on the front anti-collision beam during vehicle development and design. In order to improve the leg score of pedestrian protection, it is necessary to increase the buffering energy absorption space between the front bumper and the front anti-collision beam to meet the requirements. Therefore, during vehicle development and design, the structural hardware between the front anti-collision beam and the front bumper is eliminated. Through analysis, it is known that due to the weight of the front bumper itself and the lack of Z-direction support in the middle part of the front bumper, there is sagging deformation during long-term use. The development of pedestrian protection requires no structural hard points in the X direction between the front bumper and the front anti-collision beam, and a large buffering energy absorption space, so as to ensure that the leg impactor keeps the impactor posture vertical as much as possible during movement. The middle support structure of the present invention is applied between the front bumper and the front anti-collision beam, which can effectively prevent the front bumper from sagging, establish a support constraint between the front bumper and the front anti-collision beam, and effectively improve the pedestrian protection leg score.

[0043] The middle bracket structure of the present invention is arranged between the front bumper 10 and the front anti-collision beam 30, and utilizes the self-weight force of the front bumper in the Z direction and the front anti-collision beam as a lever support point to meet the Z-direction support function of the front anti-collision beam. At the same time, the lack of fixed constraints between the middle bracket of the front anti-collision beam and the front anti-collision beam meets the requirements of pedestrian protection for buffering deformation of the front bumper and the front anti-collision beam bracket.

[0044] Guided by the above design ideas, and after multiple rounds of structural optimization and simulation analysis, as well as durability and reliability road test verification and pedestrian protection test verification, it can be finally confirmed that the present invention can meet the requirements of resolving the above design contradictions.

[0045] The middle bracket structure and the connection structure between the front bumper and the front anti-collision beam of the present invention reduce the restrictions or constraints on the styling style, and can give full play to the design highlights of the styling; compared with the development of an active pop-up head cover to increase the pedestrian protection head collision score rate, this design is technically simpler and easier; it does not cause additional development costs and increase the cost of each vehicle. The installation time of the middle bracket of the front bumper is reduced; the parts can be kept universal and standardized. In summary, the present invention can reduce the restrictions or constraints on the styling style by improving the leg score and reducing the need for the head score.

[0046] The middle support structure and the connection structure between the front bumper and the front anti-collision beam of the present invention are simple in structure and easy to install, can effectively prevent the front bumper from deforming, increase the pedestrian leg protection score, and have strong practicality and good application prospects.

[0047] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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.

[0048] The present invention is described above by way of example in conjunction with the accompanying drawings, but the present invention is not limited to the above manner. As long as various non-substantial improvements made using the method concept and technical solution of the present invention or direct applications to other occasions are made, they all fall within the protection scope of the present invention.

Claims

1. A middle support structure, characterized in that: It includes an upper supporting surface supported on the upper end surface of the front anti-collision beam, the upper supporting surface is connected to the lower limit surface through the connecting mounting surface, the lower limit surface is an inclined surface, and the lower limit surface is inserted into the limit groove arranged behind the front anti-collision beam.

2. The middle support structure according to claim 1, characterized in that: A front bumper mounting buckle is provided at the front end of the upper support surface and is mounted on the front bumper from rear to front.

3. The middle support structure according to claim 2, characterized in that: The front bumper is provided with a hook corresponding to the front bumper installation buckle, and the front bumper installation buckle includes a buckle body and a tongue.

4. The middle support structure according to claim 3, characterized in that: The buckle body is a frame-shaped structure connected to the front edge of the upper support surface, the latch tongue is arranged in the middle of the buckle body, one end of the latch tongue is connected to the front edge of the upper support surface, and the other end is an open clamping end, and a downwardly protruding clamping block is provided on the latch tongue.

5. The middle support structure according to claim 2, characterized in that: The middle support structure is provided with a plurality of front bumper installation buckles arranged at intervals in the width direction of the vehicle body, and a lap plate which is overlapped on the front bumper during installation is provided between adjacent front bumper installation buckles.

6. The middle support structure according to claim 1, characterized in that: The connecting and mounting surface is formed by the rear end edge of the upper supporting surface extending downward along the rear end surface of the front anti-collision beam, and the lower limiting surface is inclined from the lower end edge of the connecting and mounting surface toward the front anti-collision beam and extends into the limiting groove.

7. The middle support structure according to claim 6, characterized in that: The angle between the lower limit surface and the connection installation surface is 110 degrees to 130 degrees, and the gap between the lower end of the lower limit surface and the bottom surface of the limit groove of the front anti-collision beam is 2mm to 5mm.

8. The middle support structure according to claim 6, characterized in that: A support hole is provided on the connection and installation surface, and a threaded hole corresponding to the support hole is provided on the front anti-collision beam, and a mounting screw passes through the support hole and is connected to the threaded hole.

9. The middle support structure according to claim 8, characterized in that: The diameter of the supporting hole is larger than the diameter of the mounting screw, and the mounting screw is provided with a mounting gasket with a diameter larger than the diameter of the supporting hole.

10. A connection structure between a front bumper and a front anti-collision beam, characterized in that: The middle support structure is connected by adopting the middle support structure as described in any one of claims 1 to 9.

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