CN110979227B - Front end structure of automobile longitudinal beam - Google Patents

Abstract

The invention relates to an automobile longitudinal beam front end structure, which comprises a longitudinal beam assembly and a front collision beam assembly, and is characterized in that: the front collision beam assembly comprises a front collision beam, an energy absorption box and an energy absorption box mounting plate; the front collision cross beam is of a cavity structure, and an upper cross beam reinforcing plate and a lower cross beam reinforcing plate which are connected with the front and the back of the front collision cross beam are arranged in the front collision cross beam; the energy absorption box is internally provided with an energy absorption box upper reinforcing plate and an energy absorption box lower reinforcing plate which are connected with the left side surface and the right side surface of the energy absorption box, the front end parts of the energy absorption box upper reinforcing plate and the energy absorption box lower reinforcing plate are clung to the back of the front collision beam, and the rear end parts of the energy absorption box upper reinforcing plate and the energy absorption box lower reinforcing plate are clung to the energy absorption box mounting plate; the longitudinal beam assembly comprises a longitudinal beam inner plate and a longitudinal beam outer plate which is connected with the longitudinal beam inner plate in a matched mode, an upper support is connected to the upper face of the front end portion of the longitudinal beam inner plate, a lower support is connected to the lower face of the front end portion of the longitudinal beam inner plate, the upper portion of the energy absorption box mounting plate is connected with the upper support in a matched mode, and the lower portion of the energy absorption box mounting plate is connected with the lower support in a matched mode. The energy-absorbing structure has a good collision energy-absorbing effect, and has high collision resistance and high maintenance economy.

Description

A car longitudinal beam front end structure

technical field

The invention relates to an automobile body, in particular to an RCAR type longitudinal beam front end structure.

Background technique

In 2017, my country's Insurance Automobile Safety Index (hereinafter referred to as "C-IASI") test and evaluation system was established, marking the official integration of the safety standards of my country's automobile industry with foreign automobile developed countries. This has also become a historical turning point in the development of my country's passive safety technology. "C-IASI" not only includes the "in-vehicle occupant safety index" that consumers usually pay attention to, but also adds the "crashworthiness and maintenance economic index" evaluation, hereinafter referred to as "RCAR".

According to the RCAR evaluation regulations, after the crash test is carried out at a speed of 15km/h, the first step is to accurately measure the displacement of the longitudinal beams, chassis and other parts of the test vehicle to see if it exceeds 3mm, which is regarded as the "crashworthiness" of the vehicle. "Evaluation basis; then step 2, check whether the longitudinal beam and other parts have permanent deformation, as the evaluation basis of "maintenance economy". The traditional longitudinal beam front-end structure is designed purely from the perspective of energy absorption, and has the following defects: 1. In order to improve energy absorption, the energy-absorbing box is designed too long, which is not only prone to collision instability, but also increases the cost and weight; 2. Design Large cross-sectional size or high-strength energy-absorbing boxes can meet energy-absorbing requirements. However, in order to ensure the rationality of the stiffness gradient, it is necessary to strengthen and thicken the longitudinal beams in the same way, resulting in a substantial increase in cost. Furthermore, there is an urgent need to develop a front-end structure of the car longitudinal beam, so that the longitudinal beam still has impact resistance and improves the "RCAR" of the car even when the collision energy cannot be fully absorbed.

The following patents have made many creative improvements and optimizations to the collision beam assembly, and the energy absorption effect has been improved to varying degrees, but they have not considered from the perspective of crashworthiness and maintenance economy. For example, "A Aluminum Alloy Front Collision Beam Assembly" disclosed in CN204055667U properly optimizes the structure of the collision beam, and the energy absorption effect is improved, but the energy absorption of the assembly has no breakthrough improvement; CN202138419U discloses "A Vehicle Front Collision Beam Assembly", the energy-absorbing effect is significantly improved by adding a secondary energy-absorbing box, but the secondary energy-absorbing box invades the leg collision space for pedestrian protection, and its weight and cost are high, making it difficult to carry out mass production Industrial application; CN105235617A discloses "Aluminum Alloy Energy-absorbing Box for Automobiles", which fills the energy-absorbing box with composite materials of different densities, thereby making a qualitative leap in the energy-absorbing effect, but the stiffness of the energy-absorbing box will be increased due to the filling of composite materials. The increase will have a negative impact on the economics of longitudinal beam maintenance and is only applicable to high-speed collision conditions.

Contents of the invention

The purpose of the present invention is to provide a front end structure of the longitudinal beam of the automobile, which has a high impact energy absorption effect, and at the same time has high crashworthiness and maintenance economy, that is, while ensuring the maintenance economy, it can also take into account the collision safety.

The front end structure of a longitudinal beam of an automobile according to the present invention comprises a longitudinal beam assembly and a front collision beam assembly connected to the front end of the longitudinal beam assembly, and is characterized in that: the front collision beam assembly includes a front A crash beam, an energy absorbing box whose front end is connected to the front crash beam, and an energy absorbing box mounting plate connected to the rear end of the crash box; the front crash beam has a cavity structure, and a connection The upper reinforcing plate of the beam and the lower reinforcing plate of the beam at the front and the rear; the upper reinforcing plate of the energy absorbing box and the lower reinforcing plate of the energy absorbing box connecting the left side and the right side of the energy absorbing box are arranged in the energy absorbing box; The front ends of the upper reinforcing plate of the energy-absorbing box and the lower reinforcing plate of the energy-absorbing box are in close contact with the rear of the front collision beam, and the rear ends are in close contact with the mounting plate of the energy-absorbing box; the longitudinal beam assembly includes a longitudinal The beam inner plate and the longitudinal beam outer plate matched with it, the upper bracket is connected to the front end of the longitudinal beam inner plate, the lower bracket is connected to the lower front of the front end, the upper part of the energy absorbing box installation plate is connected to the upper The bracket is mated and connected, and the lower part is mated and connected with the lower bracket.

Further, the upper reinforcing plate of the cross beam is inclined downward from front to back, and the lower reinforcing plate of the cross beam is inclined upward from front to rear.

Further, the outer contour of the cross-section of the crash box is a rectangle with rounded corners, and the radius of the rounded corners ranges from 15mm to 35mm.

Further, the left side or the right side of the crash box is provided with a crash box induction groove, and the crash box induction groove is arranged along the vertical direction.

Further, a weakening hole of the crash box is provided on the top or bottom of the crash box.

Further, the length of the crash box is 90mm to 140mm.

Further, the upper bracket has a front mounting part of the upper bracket and a lower mounting part of the upper bracket, the front mounting part of the upper bracket is connected with the upper part of the energy absorbing box mounting plate, and the lower mounting part of the upper bracket is connected with the front end of the longitudinal beam inner plate. The upper connection; the lower bracket has a front mounting part of the lower bracket and an upper mounting part of the lower bracket. link below.

Further, the upper bracket also has the left flange of the upper bracket connecting the left side of the front mounting part of the upper bracket and the left side of the lower mounting part of the upper bracket, and the upper bracket connecting the right side of the front mounting part of the upper bracket and the right side of the lower mounting part of the upper bracket Right flange; the lower bracket also has the left flange of the lower bracket connecting the left side of the front mounting part of the lower bracket and the left side of the upper mounting part of the lower bracket, and the right side of the front mounting part of the lower bracket connecting the right side of the upper mounting part of the lower bracket. Flip the lower bracket to the right.

Further, the front end of the longitudinal beam assembly is matched with a longitudinal beam front sealing plate, and the longitudinal beam front sealing plate has a first flange and a first welding surface overlapping with the inner panel of the longitudinal beam, and is connected with the suction The first front installation surface corresponding to the energy box installation plate is located between the upper bracket and the lower bracket and the energy absorption box installation plate.

Further, the front end of the longitudinal beam assembly is matched with a radiator strut, and the radiator strut has a second flange and a second welding surface overlapping with the inner panel of the longitudinal beam, and is connected to the mounting plate of the energy absorbing box. Corresponding to the second front installation surface, the second front installation surface overlaps with the first front installation surface, and is located between the upper bracket and the lower bracket and the crash box installation plate.

Further, the front collision beam assembly is made of aluminum alloy.

Beneficial technical effect of the present invention:

Since the front collision beam is equipped with the upper reinforcement plate and the lower reinforcement plate of the beam, and the upper reinforcement plate of the energy-absorbing box and the lower reinforcement plate of the energy-absorbing box are arranged in the energy-absorbing box, when a collision occurs, the front collision beam can realize better Crushing deformation, absorbing part of the collision energy, and transmitting the collision force to the energy-absorbing box, the energy-absorbing box can improve the energy absorption of the collision, reduce the collision force transmitted to the longitudinal beam assembly, and have high safety performance; because the front collision beam assembly The upper bracket and the lower bracket on the inner panel of the longitudinal beam are connected with the inner panel of the longitudinal beam, and through the reasonable design of the transmission path of the collision force, the collision force can be reasonably distributed on the inner panel of the longitudinal beam and the outer panel of the longitudinal beam, changing the original Some longitudinal beam inner panels and longitudinal beam outer panels are under the same stress state. During the low-speed collision process, the longitudinal beam inner panel and the longitudinal beam outer panel will not be displaced or permanently deformed, which can minimize the maintenance cost of the accident vehicle. During a high-speed collision, the inner panel of the longitudinal beam and the outer panel of the longitudinal beam can still achieve normal crush deformation, that is, while ensuring the economical maintenance of the vehicle, it also takes into account the safety of the collision; , the reinforcing plate under the crossbeam is inclined upward from front to back, which plays a role in concentrating the collision force to the middle of the energy-absorbing box, further improving the energy absorption of the collision; because the energy-absorbing box is designed so that the cross-sectional outline is rounded at four corners It is rectangular, with a crash box induction groove on the left or right side, and a crash box weakening hole on the top or bottom, which reduces the overall rigidity of the crash box and improves the crash safety.

Description of drawings

Fig. 1 is one of structural representations of the present invention;

Fig. 2 is the second structural representation of the present invention;

Fig. 3 is one of the structural schematic diagrams of the front collision beam assembly;

Fig. 4 is the second structural schematic diagram of the front collision beam assembly;

Fig. 5 is a structural schematic diagram of the longitudinal beam front sealing plate;

Fig. 6 is a structural schematic diagram of a radiator pillar;

Fig. 7 is a sectional view of the energy absorbing box;

Fig. 8 is a structural schematic diagram of an energy-absorbing box mounting plate;

Fig. 9 is a schematic structural view of the upper bracket.

In the figure: 1- Front collision beam assembly, 2- Longitudinal beam assembly, 3- Longitudinal beam front sealing plate, 4- Radiator pillar;

11- Front collision beam, 12- Crash box, 13- Crash box mounting plate;

111-beam upper reinforcing plate, 112-beam lower reinforcing plate;

121-The upper reinforcement plate of the energy-absorbing box, 122-The lower reinforcement plate of the energy-absorbing box, 123-The induction groove of the energy-absorbing box, 124-The weakening hole of the energy-absorbing box;

131-mounting hole, 132-positioning hole;

21- longitudinal beam inner plate, 22- longitudinal beam outer plate, 23- upper bracket, 24- lower bracket;

231-the front mounting part of the upper bracket, 232-the lower mounting part of the upper bracket, 233-the left flange of the upper bracket, 234-the right flange of the upper bracket;

31-the first flange, 32-the first welding surface, 33-the first front mounting surface;

41 - the second flange, 42 - the second welding surface, 43 - the second front mounting surface.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

Referring to the front end structure of a longitudinal beam of an automobile shown in Figures 1 to 9, it includes a longitudinal beam assembly 2 and a front collision beam assembly 1 connected to the front end of the longitudinal beam assembly 2, and is characterized in that: The front crash beam assembly 1 includes a front crash beam 11, a crash box 12 whose front end is connected to the front crash beam 11, and a crash box mounting plate 13 connected to the rear end of the crash box 12; The front collision beam 11 has a cavity structure, and an upper reinforcement plate 111 and a lower reinforcement plate 112 connecting the front and rear sides of the beam are provided inside; The upper reinforcing plate 121 of the energy-absorbing box and the lower reinforcing plate 122 of the energy-absorbing box. The ends are all in close contact with the mounting plate 13 of the energy-absorbing box; the longitudinal beam assembly 2 includes a longitudinal beam inner plate 21 and a longitudinal beam outer plate 22 mated with it, and the upper surface of the front end of the longitudinal beam inner plate 21 An upper bracket 23 is connected, and a lower bracket 24 is connected below the front end. The upper part of the crash box mounting plate 13 is connected with the upper bracket 23 , and the lower part is connected with the lower bracket 24 . The front collision beam assembly 1 is made of aluminum alloy, the upper reinforcement plate 111 and the lower reinforcement plate 112 divide the front collision beam 11 into three transverse cavities, the upper reinforcement plate 121 of the energy-absorbing box and the lower reinforcement plate of the energy-absorbing box 122 divides the energy-absorbing box 12 into three longitudinal cavities; when a collision occurs, the three cavities of the front collision beam 11 can realize crush deformation, absorb part of the collision energy, and transmit the collision force to the energy-absorbing box 12, The three cavities of the energy-absorbing box 12 can improve the energy absorption of the collision and reduce the collision force transmitted to the longitudinal beam assembly 2 . Since the front collision beam assembly 1 is connected to the upper bracket 23 and the lower bracket 24 on the longitudinal beam inner panel 21 through the energy absorbing box mounting plate 13, the collision force is transmitted to the energy absorbing box mounting plate 13 through the energy absorbing box 12 and then to the upper bracket 23 and the lower bracket 24, and finally transmitted to the longitudinal beam inner panel 21; during the low-speed collision process, the longitudinal beam inner panel 21 and the longitudinal beam outer panel 22 will not be displaced or permanently deformed, and the maintenance cost of the accident vehicle will be reduced to the greatest extent; During the high-speed collision, the longitudinal beam inner panel 21 and the longitudinal beam outer panel 22 can still achieve normal crush deformation. While ensuring the maintenance economy, it also takes into account the collision safety.

The upper reinforcing plate 111 of the cross beam is inclined downward from front to back, and the lower reinforcing plate 112 of the cross beam is inclined upward from front to rear. The three cavities of the front collision beam 11 are the upper cavity, the middle cavity and the lower cavity in turn, and the height of the front part of the middle cavity is greater than the height of the rear part; the collision force can be transmitted to the middle part of the crash box 12, further Improve collision energy absorption.

The outer contour of the cross-section of the crash box 12 is a rectangle with rounded corners, and the radius of the rounded corners ranges from 15 mm (millimeter) to 35 mm (millimeter). The four rounded corners of the crash box 12 can reduce the overall rigidity of the crash box.

The left side or the right side of the energy-absorbing box 12 is provided with an energy-absorbing box induction groove 123, and the energy-absorbing box induction groove 123 is arranged along the vertical direction; The energy box weakens the hole 124 . The crash box induction groove 123 and the crash box weakening hole 124 can reduce the rigidity of the crash box 12 .

The length of the energy-absorbing box 12 is 90mm (millimeter) to 140mm (millimeter). When the crash box 12 is transmitting the collision force, the top and bottom of the crash box 12, the upper reinforcing plate 121 of the crash box, and the lower reinforcing plate 122 of the crash box form the main force transmission path, and the left side of the crash box 12 and the The right side constitutes the secondary force transmission path.

The upper bracket 23 has a front mounting part 231 of the upper bracket and a lower mounting part 232 of the upper bracket. The upper part of the front end of the plate 21 is connected; the lower bracket 24 has a front mounting part of the lower bracket and an upper mounting part of the lower bracket, and the front mounting part of the lower bracket is connected with the lower part of the energy absorbing box mounting plate 13, and the upper mounting part of the lower bracket It is connected to the lower surface of the front end portion of the side member inner panel 21 . The upper bracket 23 and the lower bracket 24 have the same structure, both of which are widened "L"-shaped design, and are the main force transmission parts, which can transmit most of the collision force to the longitudinal beam inner plate 21. And the upper bracket 23 and the lower bracket 24 are all stamped by high-strength steel plates, with a thickness between 2.0 mm (mm) and 3.0 mm (mm); the upper and lower parts of the energy-absorbing box mounting plate 13 are provided with mounting holes 131, The middle part is provided with a positioning hole, the front mounting part 231 of the upper bracket is provided with a through hole corresponding to the upper mounting hole 131 of the energy absorbing box mounting plate 13, and the front mounting part of the lower bracket is provided with a mounting hole 131 corresponding to the lower mounting hole 13 of the energy absorbing box mounting plate 13. Corresponding through holes; the front mounting part 231 of the upper bracket, the front mounting part of the lower bracket and the energy-absorbing box mounting plate 13 on the front collision beam assembly 1 are connected together by bolt assembly, the lower mounting part 232 of the upper bracket, the upper mounting part of the lower bracket The part is overlapped with the longitudinal beam inner panel 21.

The upper bracket 23 also has an upper bracket left flange 233 connecting the left side of the upper bracket front mounting portion 231 and the upper bracket lower mounting portion 232 left side, connecting the upper bracket front mounting portion 231 right side and the upper bracket lower mounting portion 232 The upper bracket right flange 234 on the right side; the lower bracket 24 also has the left flange of the lower bracket connecting the left side of the front mounting part of the lower bracket and the left side of the upper mounting part of the lower bracket, connecting the right side and the lower side of the front mounting part of the lower bracket. The lower bracket on the right side of the mounting part on the bracket is turned right. The left flange 233 of the upper bracket and the right flange 234 of the upper bracket, the left flange of the lower bracket and the right flange of the lower bracket are all overlapped with the longitudinal beam inner plate 21 .

The front end of the longitudinal beam assembly 2 is matched with a longitudinal beam front sealing plate 3, and the longitudinal beam front sealing plate 3 has a first flange 31 and a first welding surface 32 overlapping with the longitudinal beam inner plate 21, The first front mounting surface 33 corresponding to the crash box mounting plate 13 is located between the upper bracket 23 and the lower bracket 24 and the crash box mounting plate 13 .

The front end of the longitudinal beam assembly 2 is matched with a radiator strut 4, and the radiator strut 4 has a second flange 41 and a second welding surface 42 overlapped with the inner panel 21 of the longitudinal beam, and is connected with the suction The second front installation surface 43 corresponding to the energy box installation plate 13, the second front installation surface 43 overlaps with the first front installation surface 33, and is located between the upper bracket 23 and the lower bracket 24 and the energy absorption box installation plate. Between 13. That is, the upper bracket front mounting part 231 of the upper bracket 23, the first front mounting surface 33 of the longitudinal beam front cover plate 3, the second front mounting surface 43 of the radiator pillar 4, and the top of the energy absorbing box mounting plate 13 are connected by bolts. Together; the lower bracket front mounting surface of the lower bracket 24, the first front mounting surface 33 of the longitudinal beam front cover plate 3, the second front mounting surface 43 of the radiator pillar 4, and the bottom of the energy absorbing box mounting plate 13 are connected by bolts Together. The radiator pillars 4 are all designed with a "U" cross-section. The radiator pillars 4 cooperate with the longitudinal beam front cover plate 3 to form a secondary force transmission path, and transmit a small amount of collision force to the longitudinal beam outer plate 22 .

The front collision beam 11 is a crushable design made of low-rigidity, high-strength material grades, and the yield strength is not less than 310MPa; the energy-absorbing box mounting plate 13 is made of high-strength material grades, and the yield strength is not lower than 310MPa; Provide sufficient bending and support strength. The energy-absorbing box 12 is made of 6063 series aluminum alloy material, and the yield strength is not less than 260Mpa. The longitudinal beam front sealing plate 3 and the radiator pillar 4 are all stamped by ordinary steel plates, and the thickness is relatively thin, ranging from 0.8 mm (millimeter) to 1.2 mm (millimeter).

Because the rigidity of the longitudinal beam inner panel 21 of the automobile is greater than that of the longitudinal beam outer panel 22, when the vehicle collides, the front collision beam 11 absorbs part of the collision energy and transmits the collision force to the energy-absorbing box 12; The collision force is transmitted to the longitudinal beam inner panel 21 through the upper bracket 23 and the lower bracket 24 , and a small part of the collision force is transmitted to the longitudinal beam outer panel 22 through the longitudinal beam front cover plate 3 and the radiator pillar 4 . The present invention rationally designs the transmission path of the collision force, so that the collision force can be reasonably distributed on the longitudinal beam inner panel 21 and the longitudinal beam outer panel 22, and the original longitudinal beam inner panel 21 and the longitudinal beam outer panel 22 are equally affected. The state of force; after the low-speed collision of the vehicle, the longitudinal beam assembly 2 will not be displaced or permanently deformed, and the maintenance cost of the accident vehicle will be reduced to the greatest extent; after the high-speed collision, the longitudinal beam assembly 2 can achieve normal crushing out of shape.

The invention can rationally distribute the stressed state of the inner panel of the longitudinal beam and the outer panel of the longitudinal beam, can improve the energy absorption effect, and make the vehicle have higher crashworthiness and maintenance economy, that is, while ensuring the maintenance economy , taking into account the collision safety; meanwhile, the structure is simple, the weight is light, the application range is wide, and the production cost is low.

Claims (8)

1. An automobile longitudinal beam front end structure, comprising a longitudinal beam assembly (2), and a front collision beam assembly (1) connected to the front end of the longitudinal beam assembly (2), characterized in that: the front The crash beam assembly (1) includes a front crash beam (11), a crash box (12) whose front end is connected to the front crash beam (11), a crash box (12) connected to the rear end of the crash box (12) An energy-absorbing box mounting plate (13); the front collision beam (11) has a cavity structure, and an upper beam reinforcement plate (111) and a lower beam reinforcement plate (112) connecting the front and rear of the beam are arranged inside; The reinforcing plate (111) and the lower reinforcing plate of the beam (112) divide the front collision beam (11) into three transverse cavities; the energy-absorbing box (12) is provided with a The upper reinforcing plate (121) of the energy-absorbing box and the lower reinforcing plate (122) of the energy-absorbing box, the upper reinforcing plate (121) of the energy-absorbing box and the lower reinforcing plate (122) of the energy-absorbing box divide the energy-absorbing box (12) into longitudinal Three cavities; the front ends of the upper reinforcement plate (121) of the energy-absorbing box and the lower reinforcement plate (122) of the energy-absorbing box are in close contact with the rear of the front collision beam (11), and the rear ends are all in contact with the The mounting plate (13) of the energy-absorbing box is closely attached; the longitudinal beam assembly (2) includes a longitudinal beam inner plate (21) and a longitudinal beam outer plate (22) matched with it, and the longitudinal beam inner plate (21 ) is connected with an upper bracket (23) above the front end, and a lower bracket (24) is connected with the bottom of the front end, the upper part of the energy absorbing box mounting plate (13) is connected with the upper bracket (23), and the lower part is connected with the upper bracket (23). The lower bracket (24) is mated and connected; The front end of the longitudinal beam assembly (2) is fitted with a longitudinal beam front sealing plate (3), and the longitudinal beam front sealing plate (3) has a first flange overlapping with the longitudinal beam inner panel (21) (31) and the first welding surface (32), the first front mounting surface (33) corresponding to the energy absorbing box mounting plate (13), the first front mounting surface (33) is located on the upper bracket (23 ) and between the lower bracket (24) and the crash box mounting plate (13); The front end of the longitudinal beam assembly (2) is matched with a radiator support (4), and the radiator support (4) has a second flange (41) overlapping with the inner panel of the longitudinal beam (21) and The second welding surface (42), the second front installation surface (43) corresponding to the energy absorbing box installation plate (13), the second front installation surface (43) and the first front installation surface (33) Arranged overlappingly, and located between the upper bracket (23) and the lower bracket (24) and the energy absorbing box installation plate (13). 2. The front end structure of the vehicle longitudinal beam according to claim 1, characterized in that: the upper reinforcement plate (111) of the beam slopes downward from front to rear, and the lower reinforcement plate (112) of the beam slopes upward from front to rear. 3. The vehicle longitudinal beam front end structure according to claim 1 or 2, characterized in that: the outer contour of the cross-section of the energy-absorbing box (12) is a rectangle with rounded corners, and the radius range of the rounded corners is 15mm to 35mm. 4. The vehicle longitudinal beam front end structure according to claim 3, characterized in that: the left or right side of the energy-absorbing box (12) is provided with an energy-absorbing box induction groove (123), and the energy-absorbing box (12) The cartridge induction slots (123) are arranged in the vertical direction. 5 . The front end structure of the vehicle side beam according to claim 4 , characterized in that: the crash box ( 12 ) is provided with a crash box weakening hole ( 124 ) on the top or bottom. 6. The front end structure of the longitudinal beam of the vehicle according to claim 5, characterized in that: the length of the crash box (12) is 90 mm to 140 mm. 7. The vehicle longitudinal beam front end structure according to claim 3, characterized in that: the upper bracket (23) has a front mounting part (231) of the upper bracket and a lower mounting part (232) of the upper bracket, and the front of the upper bracket The installation part (231) is connected with the upper part of the energy-absorbing box installation plate (13), and the lower installation part (232) of the upper bracket is connected with the top of the front end of the longitudinal beam inner plate (21); the lower bracket (24) has a lower The front installation part of the bracket and the upper installation part of the lower bracket, the front installation part of the lower bracket is connected with the lower part of the energy absorbing box installation plate (13), and the upper installation part of the lower bracket is connected with the lower part of the front end of the longitudinal beam inner plate (21) . 8. The vehicle longitudinal beam front end structure according to claim 7, characterized in that: the upper bracket (23) also has a left side connecting the front mounting part (231) of the upper bracket and the left side of the lower mounting part (232) of the upper bracket The left flange (233) of the upper bracket, the right flange (234) of the upper bracket connecting the right side of the front mounting part (231) of the upper bracket and the right side of the lower mounting part (232) of the upper bracket; the lower bracket (24) also There is a left flange of the lower bracket connecting the left side of the front mounting part of the lower bracket and the left side of the upper mounting part of the lower bracket, and a right flange of the lower bracket connecting the right side of the front mounting part of the lower bracket and the right side of the upper mounting part of the lower bracket.

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