New energy automobile anti-collision beam assembly

Abstract

The application discloses a new energy automobile anti-collision beam assembly, which comprises a front anti-collision beam, an energy absorption box and a front longitudinal beam, the energy absorption box comprises a front shell connected with the front anti-collision beam and two expansion half-shells movably arranged on the front longitudinal beam and oppositely arranged, the two expansion half-shells are inserted into the inner cavity of the front shell, and the expansion half-shells are arranged on the front longitudinal beam and are used for controlling the expansion of the two expansion half-shells, so that the two expansion half-shells are abutted against the first inner wall surface of the front shell. The new energy automobile anti-collision beam assembly has novel structure, practical functions, can protect the automobile and reduce the damage of the automobile when danger occurs, and can also play a role in protecting the safety of the driver and passengers.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of automobile parts, and in particular, relates to a new energy automobile anti-collision beam assembly. BACKGROUND

[0002] With the development of society and the progress of environmental protection concept, new energy vehicles as an environmentally friendly and efficient means of transportation have developed rapidly in recent years. The power source of new energy vehicles is no longer or only vehicle fuel. Generally, a storage battery is used to store electric energy, and then the vehicle is driven by electric energy. The use of storage batteries eliminates the need to start the engine to provide power for the internal power supply of the vehicle. The storage battery can provide a large amount of energy supply in non-starting or starting mode.

[0003] New energy vehicles still install anti-collision beams, which are made of steel or other materials and consist of a front beam and two end-connected yield strength angle energy-absorbing boxes. The deformation of the energy-absorbing boxes in the collision of the vehicle eliminates the collision generated at a low speed of the vehicle, avoiding damage to the internal main beam structure of the vehicle. After the collision of the anti-collision beam of the vehicle, the energy-absorbing boxes will deform and need to be repaired and replaced, which will result in high repair costs and time investment costs. Therefore, an anti-collision beam that can recover after a small impact is needed to reduce the time investment for repair after each impact.

[0004] The patent document with publication number CN112373425A discloses a multi-angle anti-collision beam installed on a vehicle chassis, which includes a front anti-collision beam, a telescopic cylinder, a positioning suction cup, and a side anti-collision mechanism. The telescopic cylinder is fixedly arranged on the vehicle chassis and is in transmission connection with the front anti-collision beam. The two ends of the front anti-collision beam are hingedly connected with the two side anti-collision mechanisms. The two side anti-collision mechanisms are in abutment with the two positioning suction cups, which are symmetrically and fixedly arranged on the two sides of the vehicle body. When in use, the telescopic cylinder drives the front anti-collision beam to move forward and backward, and the front anti-collision beam drives one end of the side anti-collision mechanism to rotate around the positioning suction cup. The side anti-collision mechanism is provided with a sliding groove, and the sliding block on the suction cup moves in the sliding groove to make the first side beam rotate, thereby avoiding hindering the opening and closing of the vehicle door. The anti-collision beam of this structure will affect the appearance size of the front and side of the vehicle. The telescopic cylinder, damper, etc. are installed on the chassis, and the force of the vehicle frontal collision is directly transmitted to the chassis parts, affecting the stiffness and strength of the chassis parts. The side wall outer panel, fender, etc. covering parts on the side of the vehicle have low strength and stiffness, and cannot provide a stable support and collision force transmission path for the side anti-collision mechanism. The side anti-collision effect needs to be verified. The anti-collision beam of this structure needs to replace the whole part after damage, especially the telescopic cylinder. The damaged telescopic cylinder is difficult to disassemble and must be replaced with a new one. Therefore, this structure has the defects of difficult maintenance, long maintenance time, and high maintenance cost. SUMMARY

[0005] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a new energy automobile anti-collision beam assembly, which aims to reduce the maintenance time input of the energy absorption box after a collision and save more maintenance time for automobile users.

[0006] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows: a new energy automobile anti-collision beam assembly, comprising a front anti-collision beam, an energy absorption box and a front longitudinal beam, the energy absorption box comprising a front shell connected with the front anti-collision beam and two expansion half-shells movably arranged on the front longitudinal beam and oppositely arranged, the two expansion half-shells being inserted into the inner cavity of the front shell, and the front longitudinal beam being provided with an expansion part for controlling the expansion of the two expansion half-shells, so that the two expansion half-shells abut against the first inner wall surface of the front shell.

[0007] The expansion part comprises a chassis arranged on the front longitudinal beam, a wedge mechanism arranged on the chassis and used for controlling the expansion of the two expansion half-shells, and a driving mechanism connected with the wedge mechanism, and the wedge mechanism is located between the two expansion half-shells.

[0008] The wedge mechanism comprises a tapered head connected with the driving mechanism and two wedge blocks matched with the tapered head, the tapered head is located between the two wedge blocks, and the two wedge blocks are located between the two expansion half-shells and respectively contact with the inner wall surfaces of the two expansion half-shells.

[0009] A cavity is formed in the wedge block, and a movable moving plate is arranged in the cavity, a plurality of abutting springs are arranged between one side of the moving plate and the inner wall surface of the cavity, and a plurality of interference plates are arranged on the other side of the moving plate, the interference plates pass through the wedge block and the expansion half-shell and abut against the first inner wall surface.

[0010] The plane of the interference plate is parallel to the friction lines arranged on the first inner wall surface, and the wear resistance of the friction lines arranged on the first inner wall surface is greater than that of the friction lines arranged on the outer wall surface of the expansion half-shell and the wedge block.

[0011] The driving mechanism comprises a motor, a threaded shaft in threaded connection with the chassis and connected with the tapered head, and a transmission mechanism connected with the motor and the threaded shaft.

[0012] The transmission mechanism is a gear transmission mechanism.

[0013] The transmission mechanism comprises a driving gear and a driven gear, the driven gear is arranged on the threaded shaft, a clamping key is arranged on the inner side of the driven gear, a clamping groove is arranged on the outer side of the threaded shaft, a return spring is arranged between the two sides of the clamping key and the clamping groove, and the angle stroke of the clamping groove is greater than that of the clamping key, so that the clamping key can rotate at a set angle in the clamping groove.

[0014] The expansion part further comprises a resisting column and an electric cylinder connected with the resisting column, the resisting column passes through the threaded shaft, the conical head and the front shell in sequence and abuts against the front anti-collision beam.

[0015] A buffer head is arranged on the resisting column, the buffer head is in contact with the front anti-collision beam, and a buffer spring is arranged between the buffer head and the resisting column.

[0016] The new energy automobile anti-collision beam assembly has novel structure, practical function, can protect the automobile and reduce the damage of the automobile when danger occurs, and can also protect the driver and passengers. BRIEF DESCRIPTION OF DRAWINGS

[0017] The present specification includes the following drawings, and the shown contents are as follows:

[0018] Figure 1 is the overall schematic view of the new energy automobile anti-collision beam assembly of the present application;

[0019] Figure 2 is the sectional view of the energy absorption box;

[0020] Figure 3 is Figure 2 the enlarged schematic view of A of

[0021] Figure 4 is the enlarged schematic view of B of Figure 2

[0022] Figure 5 is the internal schematic view of the energy absorption box;

[0023] Figure 6 is the structural schematic view of the driving gear and the driven gear;

[0024] Figure 7 is the internal structural schematic view of the driving gear and the driven gear;

[0025] Marked in the figure: 1, front anti-collision beam; 2, energy absorption box; 21, front shell; 22, expansion half shell; 23, expansion part; 231, chassis; 232, conical head; 233, threaded shaft; 2331, driven gear; 2332, clamping key; 2333, clamping groove; 2334, homing spring; 234, electric motor; 2341, driving gear; 235, electric cylinder; 2351, moving seat; 2352, bearing seat; 236, resisting column; 2361, buffer head; 2362, buffer spring; 237, wedge block; 2371, cavity; 2372, moving plate; 2373, pressing spring; 2374, interference plate; 3, longitudinal beam end. DETAILED DESCRIPTION

[0026] ​The specific embodiments of the present application will be further described below with reference to the drawings, and the purpose is to help the skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solutions of the present application, and to help its implementation.

[0027] It should be noted that in the following embodiments, the "first", "second" and "third" do not represent the absolute distinction of structure and / or function, nor represent the execution order, but only for the convenience of description.

[0028] As Figures 1 to 7 shown, the present application provides a new energy vehicle anti-collision beam assembly, comprising a front anti-collision beam 1, an energy absorption box 2 and a front longitudinal beam 3, the energy absorption box 2 and the front longitudinal beam 3 are provided with two, the front ends of the two energy absorption boxes 2 are connected with the two ends of the front anti-collision beam 1, the rear ends of the two energy absorption boxes 2 are connected with the two front longitudinal beams 3 respectively, the front anti-collision beam 1 is located at the head part of the vehicle for protecting the vehicle. The energy absorption box 2 comprises a front shell 21 connected with the front anti-collision beam 1 and two expansion half shells 22 movably arranged on the front longitudinal beam 3 and oppositely arranged, the two expansion half shells 22 are inserted into the inner cavity of the front shell 21, the expansion half shells 22 are arranged on the front longitudinal beam 3 for controlling the expansion of the two expansion half shells 22, so that the two expansion half shells 22 abut against the first inner wall surface of the front shell 21.

[0029] Specifically, as Figure 1 and Figure 2 shown, the front shell 21 is a square tube, the front shell 21 is fixed at the rear side of one end of the front anti-collision beam 1, the length direction of the front shell 21 and the front longitudinal beam 3 is parallel to the first direction, the two front longitudinal beams 3 are parallel to the second direction, the first direction and the second direction are both horizontal directions and the first direction and the second direction are perpendicular to each other, the first direction is parallel to the length direction of the vehicle, and the second direction is parallel to the length-width direction of the vehicle. When the vehicle has a front collision accident, the front anti-collision beam 1 is impacted, the front shell 21 can move relative to the expansion half shell 22 along the first direction, the two oppositely arranged expansion half shells 22 are on the same straight line parallel to the second direction, the two expansion half shells 22 are movably arranged at the end of the front longitudinal beam 3, the expansion half shell 22 is in the form of a half frame, is movably arranged on the inner side of the front shell 21, the front end of the expansion half shell 22 is inserted into the rectangular inner cavity of the front shell 21, the first outer wall surface of the expansion half shell 22 is in contact with the first inner wall surface of the front shell 21, and the first outer wall surface of the expansion half shell 22 and the first inner wall surface of the front shell 21 are planes perpendicular to the second direction. The first outer wall surface of the expansion half shell 22 and the first inner wall surface of the front shell 21 are provided with friction lines, the friction lines are referred to Figure 5When the expansion half-shell 22 expands and abuts against the first inner wall surface of the front outer shell 21, the movement of the expansion half-shell 22 into the front outer shell 21 requires overcoming the frictional force between the front outer shell 21 and the expansion half-shell 22.

[0030] The front longitudinal beam 3 is provided with an expansion section 23, which can press against the two expansion half-shells 22, thereby further increasing the friction between the front outer shell 21 and the expansion half-shells 22. Figure 2 As shown, the expansion section 23 is inserted between the two expansion half-shells 22 of the energy-absorbing box 2. The expansion section 23 includes a base frame 231 mounted on the front longitudinal beam, an electric cylinder 235, a stop post 236, a wedge mechanism mounted on the base frame 231 for controlling the expansion of the two expansion half-shells 22, and a drive mechanism connected to the wedge mechanism. The wedge mechanism is located between the two expansion half-shells 22, and the direction of movement of the two expansion half-shells 22 during expansion is parallel to the second direction. The wedge mechanism includes a conical head 232 connected to the drive mechanism and two wedge blocks 237 that cooperate with the conical head 232. The conical head 232 is located between the two wedge blocks 237, and the two wedge blocks 237 are located between the two expansion half-shells 22, with each wedge block 237 contacting the inner wall surface of the two expansion half-shells 22. The base frame 231 is fixedly mounted at the end of the front longitudinal beam 3. The base frame 231 is U-shaped and has a base and two support blocks fixed on the base. The base frame 231 is located between two expanded semi-shells 22. Two wedge blocks 237 are slidably mounted on the two support blocks of the base frame 231 and abut against the inner sides of the two expanded semi-shells 22. The conical head 232 is movable. The direction of movement of the conical head 232 is parallel to the first direction. When the conical head 232 moves, it drives the two wedge blocks 237 to move synchronously in a straight line. The direction of movement of the wedge blocks 237 is parallel to the second direction. The conical head 232 is provided with a driving surface, and the wedge blocks 237 are provided with a mating surface that mates with the driving surface. Both the driving surface and the mating surface are inclined planes.

[0031] like Figure 1 and Figure 2 As shown, the drive mechanism includes a motor 234, a threaded shaft 233 that is threadedly connected to the base frame 231 and connected to the conical head 232, and a transmission mechanism connected to the motor 234 and the threaded shaft 233. The threaded shaft 233 is threadedly connected to the base frame 231, and the conical head 232 is coaxially and fixedly connected to the threaded shaft 233. The conical head 232 simultaneously abuts against the inclined surfaces of two wedge blocks 237. The motor 234 drives the threaded shaft 233 to rotate. Through holes are opened inside the threaded shaft 233 and the conical head 232. The electric cylinder 235 drives the abutment 236 to pass through the threaded shaft 233, the conical head 232, and the front housing 21 in sequence and abut against the rear side of the front anti-collision beam 1. The motor 234 and the electric cylinder 235 are directly electrically connected to the battery on the vehicle, and the battery provides power to the motor 234 and the electric cylinder 235.

[0032] The structure expands the two expansion half-shells 22 through the expansion part 23, makes the two expansion half-shells 22 abut against the inner side of the front shell 21, provides the friction force between the expansion half-shells 22 and the front shell 21 to connect the front bumper beam 1 and the front longitudinal beam 3, when the front bumper beam 1 is impacted, the front bumper beam 1 extrudes the energy absorption box 2 backward, the energy absorption box 2 overcomes the friction force and shrinks, and the function of eliminating the impact force is achieved. The structure also uses the new energy automobile battery as the power supply to supply power to the motor 234 and the electric cylinder 235 in an electrically controlled manner, so that the motor 234 and the electric cylinder 235 can control the homing and friction force loading of the energy absorption box 2. When the energy absorption box 2 shrinks, that is, the relative distance between the front shell 21 and the expansion half-shells 22 is shortened, the electric cylinder 235 is elongated, the abutment column 236 is pushed to move linearly in the first direction, the abutment column 236 pushes the front bumper beam 1 to move forward (that is, to move forward of the vehicle), the front bumper beam 1 drives the front shell 21 to move forward, and the position of the front bumper beam 1 before impact is restored. Then the motor 234 rotates to drive the threaded shaft 233 to rotate, so that the conical head 232 moves relative to the wedge-shaped block 237, and the two wedge-shaped blocks 237 abutting on both sides of the conical head 232 are translated outward. The wedge-shaped block 237 pushes the expansion half-shells 22 to move, and the expansion half-shells 22 are pressed against the first inner wall surface of the front shell 21 again, so that a certain friction force is generated between the expansion half-shells 22 and the front shell 21. Then the electric cylinder 235 is retracted to pull the abutment column 236 to move toward the rear of the front bumper beam 1, so that the abutment column 236 moves away from the front bumper beam 1, avoiding damage to the abutment column 236 in the next impact. The friction pattern between the front shell 21 and the expansion half-shells 22 will be worn to a certain extent after each collision, and the expansion of the wedge-shaped block 237 ensures that the expansion half-shells 22 abut against the inner side of the front shell 21, so that a large friction force exists between the front shell 21 and the expansion half-shells 22, and the energy absorption box 2 has a certain energy absorption effect after each recovery. Compared with the traditional energy absorption box 2, the structure has the recovery function, and the damage of the traditional energy absorption box 2 to achieve the new energy effect is changed to overcome the friction force to achieve the energy absorption effect. The energy absorption box 2 in the structure is homed and loaded with friction force by the electric cylinder 235 and the motor 234, avoiding damage to the energy absorption box 2 in small impacts, and the energy absorption box 2 has the recovery function. The bumper beam uses the battery on the new energy automobile to continuously supply power to the electric cylinder 235 and the motor 234, and through intelligent control, the bumper beam can be automatically recovered after each collision, avoiding the maintenance time of the energy absorption box 2, and saving more maintenance time for the user of the automobile.

[0033] As Figures 5 to 7As shown, the transmission mechanism is a gear transmission mechanism, the transmission mechanism includes a driving gear and a driven gear 2331, the driven gear 2331 is fixedly arranged on the threaded shaft 233 and coaxial with the threaded shaft 233, four clamping keys 2332 are arranged on the inner side of the driven gear 2331, four clamping grooves 2333 are arranged on the outer side of the threaded shaft 233, return springs 2334 are arranged between the clamping keys 2332 and the clamping grooves 2333 on both sides, the angle stroke of the clamping groove 2333 is greater than the angle stroke of the clamping key 2332, so that the clamping key 2332 can rotate at a small angle in the clamping groove 2333, the output end of the motor 234 is fixedly provided with a driving gear 2341, the upper end of the gear teeth of the driven gear 2331 is gradually tapered into a sharp shape, the lower end of the driving gear 2341 is gradually tapered into a sharp shape, the middle section of the output end of the electric cylinder 235 is fixedly provided with a moving seat 2351, the motor 234 is fixed on the moving seat 2351, two bearing seats 2352 are further fixedly arranged on the moving seat 2351, the output end of the motor 234 is rotatably arranged on the two bearing seats 2352, the driving gear 2341 is located between the two bearing seats 2352, when the output end of the electric cylinder 235 advances, the driving gear 2341 is clamped into the driven gear 2331, wherein the driving gear 2341 and the driven gear 2331 are both straight teeth, which is beneficial to clamping and relative movement between the two gears.

[0034] In this structure, the mode of driving the threaded shaft 233 to rotate by the motor 234 is set to a gear driving mode, wherein the motor 234 moves with the abutting column 236 of the electric cylinder 235 and is clamped into the driven gear 2331, this structure mainly makes the electric cylinder 235 drive the motor 234 loaded with friction force away from the energy absorption box 2, avoids damage to the energy absorption box 2 caused by the motor 234 when the energy absorption box 2 encounters a larger collision, facilitates replacement of the energy absorption box 2 itself in the case of larger damage, does not involve replacement of complex parts such as the motor 234, reduces the maintenance cost of the motor 234 and the electric cylinder 235, when the energy absorption box 2 is in place, the electric cylinder 235 drives the abutting column 236 and the motor 234 away from the energy absorption box 2, after the energy absorption box 2 shrinks to eliminate the collision force, the electric cylinder 235 extends the abutting column 236 out of the front anti-collision beam 1, at this time the motor 234 and the driving gear are also close to the driven gear, and then mesh with each other, the clamping key 2332 that can rotate slightly and the gear teeth in the shape of a sharp tip ensure that the driving gear can be smoothly clamped into the driven gear when moving to the driven gear.

[0035] As Figure 2 and Figure 3As shown, the frictional lines arranged on the first inner wall surface of the front shell 21 and the first outer wall surface of the expansion half shell 22 are perpendicular to the sliding direction of the expansion half shell 22 in the front shell 21, the wedge-shaped block 237 is internally provided with a cavity 2371, a sliding plate 2372 is slidably arranged in the cavity 2371, the moving direction of the sliding plate 2372 in the cavity 2371 is parallel to the second direction, a plurality of abutting springs 2373 are arranged between one side of the sliding plate 2372 and the cavity 2371, the abutting springs 2373 are cylindrical helical springs and compression springs, all the abutting springs 2373 are in the same straight line parallel to the first direction, a plurality of interference plates 2374 are arrayed on the other side of the sliding plate 2372, all the interference plates 2374 are in the same straight line parallel to the first direction, the abutting springs 2373 are used to exert elastic force on the interference plates 2374, under the action of the elastic force exerted by the abutting springs 2373, the interference plates 2374 pass through the wedge-shaped block 237 and the expansion half shell 22 in turn, and abut against the first inner wall surface of the front shell 21, the plane of the interference plate 2374 is parallel to the frictional lines on the first inner wall surface, and the wear resistance of the frictional lines of the front shell 21 is greater than that of the frictional lines arranged on the first outer wall surface of the expansion half shell 22.

[0036] This structure is used to further increase the resistance between the expansion half shell 22 and the front shell 21; under the action of the abutting springs 2373, the sliding plate 2372 always extends the interference plates 2374 out of the expansion half shell 22 and abuts against the first inner wall surface of the front shell 21, and the relative movement of the front shell 21 and the expansion half shell 22 needs to overcome the friction between the front shell 21 and the expansion half shell 22, and also needs to overcome the friction between the interference plates 2374 and the frictional lines of the front shell 21, after the relative movement of the front shell 21 and the expansion half shell 22, the front shell 21 wears the side edges of the interference plates 2374, the abutting springs 2373 continue to abut the interference plates 2374 out, so that the interference plates 2374 and the front shell 21 always have friction, and as the wedge-shaped block gradually approaches the front shell 21, the elastic force exerted by the abutting springs 2373 on the interference plates 2374 gradually increases, the friction between the interference plates 2374 and the front shell 21 increases, and also supplements the problem that the friction is not enough due to the wear between the front shell 21 and the expansion half shell 22.

[0037] As Figure 4As shown, the head end of the abutment 236 is slidably provided with a buffer head 2361, one end of the buffer head 2361 is in contact with the front anti-collision beam 1, the other end of the buffer head 2361 is mounted on the abutment 236, the moving direction of the buffer head 2361 relative to the abutment 236 is parallel to the first direction, a buffer spring 2362 is arranged between the buffer head 2361 and the head end of the abutment 236, the buffer spring 2362 is used to apply an elastic force to the buffer head 2361, the buffer spring 2362 is a cylindrical helical spring and is a compression spring, the length direction of the buffer spring 2362 is parallel to the first direction, which can also effectively protect the abutment 236 from being damaged by impact, and provide certain displacement protection for the electric cylinder 235 when the abutment 236 supports the front anti-collision beam 1.

[0038] The new energy vehicle anti-collision beam assembly has the following advantages:

[0039] (1) The energy absorption box is returned to the original position and loaded with friction by the electric cylinder and the motor, which avoids damage to the energy absorption box in small impacts, and makes the energy absorption box have a recovery function. This anti-collision beam uses the battery on the new energy vehicle to continuously power the electric cylinder and the motor. Through intelligent control, the anti-collision beam can be automatically recovered after each collision, avoiding maintenance time investment for the energy absorption box and saving more maintenance time for the user of the vehicle.

[0040] (2) By setting the remote structure, the electric cylinder and the motor that control the return and loading of the energy absorption box can be as far away from the energy absorption box as possible, avoiding an increase in maintenance costs caused by damage to the motor and the electric cylinder when the energy absorption box is damaged.

[0041] (3) The interference plate further increases the movement between the expansion half-shell and the front shell to overcome stress. As the wedge-shaped plate approaches the front shell, the force of the abutting spring increases, and the friction between the interference plate and the front shell increases, supplementing the problem of insufficient friction caused by wear between the front shell and the expansion half-shell.

[0042] The above describes the present application in conjunction with the drawings. Obviously, the specific implementation of the present application is not limited to the above manner. As long as various non-essential improvements are made using the method concept and technical solution of the present application, or the above-mentioned concept and technical solution of the present application is directly applied to other occasions without improvement, they are all within the protection scope of the present application.

Claims

1. A new energy vehicle anti-collision beam assembly, comprising a front anti-collision beam, an energy absorption box and a front longitudinal beam, characterized in that: The energy absorption box comprises a front shell connected with the front anti-collision beam and two expansion half-shells movably arranged on the front longitudinal beam and oppositely arranged, the two expansion half-shells are inserted into the inner cavity of the front shell, and the front longitudinal beam is provided with an expansion part for controlling the expansion of the two expansion half-shells, so that the two expansion half-shells abut against the first inner wall surface of the front shell; The front shell is a square tube, the front shell is fixed at the rear end of the front anti-collision beam, the length direction of the front shell and the front longitudinal beam is parallel to the first direction, the two front longitudinal beams are in the same straight line parallel to the second direction, the first direction and the second direction are both horizontal directions and the first direction and the second direction are perpendicular to each other, the first direction is parallel to the length direction of the automobile, and the second direction is parallel to the width direction of the automobile; When the automobile is involved in a front collision accident, the front anti-collision beam is subjected to an impact force, the front shell moves relative to the expansion half-shells along the first direction, the two oppositely arranged expansion half-shells are in the same straight line parallel to the second direction, the two expansion half-shells are movably arranged at the end of the front longitudinal beam, the expansion half-shells are in the form of a half frame, are movably arranged on the inner side of the front shell, the front end of the expansion half-shells is inserted into the rectangular inner cavity of the front shell, the first outer wall surface of the expansion half-shells is in contact with the first inner wall surface of the front shell, and the first outer wall surface of the expansion half-shells and the first inner wall surface of the front shell are planes perpendicular to the second direction; the first outer wall surface of the expansion half-shells and the first inner wall surface of the front shell are provided with friction lines, when the expansion half-shells expand and abut against the first inner wall surface of the front shell, the movement of the expansion half-shells into the front shell needs to overcome the friction between the front shell and the expansion half-shells; The front longitudinal beam is provided with an expansion part, the expansion part abuts against the two expansion half-shells, so that the friction lines further increase the friction between the front shell and the expansion half-shells, the expansion part is inserted between the two expansion half-shells of the energy absorption box, and the expansion part comprises a chassis arranged on the front longitudinal beam, an electric cylinder, a supporting column, a wedge mechanism arranged on the chassis and used for controlling the expansion of the two expansion half-shells, and a driving mechanism connected with the wedge mechanism, the wedge mechanism is located between the two expansion half-shells, and the movement direction of the two expansion half-shells during the expansion is parallel to the second direction; The wedge mechanism comprises a conical head connected with the driving mechanism and two wedge blocks matched with the conical head, the conical head is located between the two wedge blocks, the two wedge blocks are located between the two expansion half-shells and are in contact with the inner wall surfaces of the two expansion half-shells respectively, and the chassis is fixedly arranged at the end of the front longitudinal beam, the chassis has a base and two supporting blocks fixedly arranged on the base, the chassis is located between the two expansion half-shells, and the two wedge blocks are slidably arranged on the two supporting blocks of the chassis and abut against the inner sides of the two expansion half-shells respectively; The conical head is movably arranged, the movement direction of the conical head is parallel to the first direction, the conical head drives the two wedge blocks to move synchronously in a straight line when the conical head moves, the movement direction of the wedge blocks is parallel to the second direction when the wedge blocks move, the conical head is provided with a driving surface, the wedge blocks are provided with matching surfaces matched with the driving surface, and the driving surface and the matching surfaces are inclined planes. The driving mechanism comprises a motor, a threaded shaft in threaded connection with the base frame and connected with the conical head, and a transmission mechanism connected with the motor and the threaded shaft. When the front anti-collision beam is impacted, the front anti-collision beam extrudes the energy absorption box rearward, the energy absorption box overcomes the friction and shrinks; when the energy absorption box shrinks, that is, the relative distance between the front shell and the expansion half-shell is shortened, the electric cylinder is elongated, pushes the abutment column to move linearly in the first direction, the abutment column pushes the front anti-collision beam to move forward, the front anti-collision beam drives the front shell to move forward, and the position of the front anti-collision beam before impact is restored, then the motor rotates, drives the threaded shaft to rotate, and moves the conical head relative to the wedge-shaped block, so that the two wedge-shaped blocks abutting against the two sides of the conical head are translated outward, the wedge-shaped blocks push the expansion half-shell to move, and the expansion half-shell is pressed against the first inner wall surface of the front shell again, so that a certain friction force is generated between the expansion half-shell and the front shell, then the electric cylinder is retracted, pulls the abutment column to move toward the rear of the front anti-collision beam, and the abutment column is away from the front anti-collision beam, so that the abutment column is prevented from being damaged in the next impact. The friction lines arranged on the first inner wall surface of the front shell and the first outer wall surface of the expansion half-shell are perpendicular to the sliding direction of the expansion half-shell in the front shell, a cavity is formed in the wedge-shaped block, a moving plate is slidably arranged in the cavity, the moving direction of the moving plate in the cavity is parallel to the second direction, a plurality of abutting springs are arranged between one side of the moving plate and the cavity, all the abutting springs are arranged on the same straight line parallel to the first direction, a plurality of interference plates are arranged on the other side of the moving plate, and all the interference plates are arranged on the same straight line parallel to the first direction, the abutting springs are used for applying elastic force to the interference plates, the interference plates pass through the wedge-shaped block and the expansion half-shell in sequence under the action of the elastic force of the abutting springs, and abut against the first inner wall surface of the front shell, the plane of the interference plate is parallel to the friction lines on the first inner wall surface, and the wear resistance of the friction lines of the front shell is greater than that of the friction lines arranged on the first outer wall surface of the expansion half-shell.

2. The new energy automobile anti-collision beam assembly according to claim 1, characterized in that: The transmission mechanism is a gear transmission mechanism.

3. The new energy automobile anti-collision beam assembly according to claim 2, characterized in that: The transmission mechanism comprises a driving gear and a driven gear, the driven gear is fixedly arranged on the threaded shaft and coaxial with the threaded shaft, four clamping keys are arranged on the inner side of the driven gear, four clamping grooves are arranged on the outer side of the threaded shaft, a return spring is arranged between the two sides of each clamping key and clamping groove, the angle stroke of the clamping groove is greater than that of the clamping key, so that the clamping key can rotate by a small angle in the clamping groove, the driving gear is fixedly arranged on the output end of the motor, and the lower end of the gear teeth of the driven gear is gradually tapered into a sharp end, and the upper end of the driving gear is gradually tapered into a sharp end.

4. The new energy automobile anti-collision beam assembly according to claim 3, characterized in that: The middle section of the output end of the electric cylinder is fixedly provided with a moving seat, the motor is fixed on the moving seat, two bearing seats are further fixed on the moving seat, the output end of the motor is rotatably arranged on the two bearing seats, and the driving gear is located between the two bearing seats.

5. The new energy automobile anti-collision beam assembly according to claim 4, characterized in that: When the output end of the electric cylinder moves forward, the driving gear is clamped into the driven gear, and the driving gear and the driven gear are both straight gears.

6. The new energy automobile anti-collision beam assembly according to claim 1, characterized in that: The threaded shaft is connected to the underframe, the conical head is coaxially fixedly connected with the threaded shaft, the conical head is simultaneously abutted on the inclined surfaces of the two wedge-shaped blocks, the motor drives the threaded shaft to rotate, a through hole is arranged in the interior of the threaded shaft and the conical head, the electric cylinder driving abutting column is sequentially arranged through the threaded shaft, the conical head and the front shell and is abutted on the rear side of the front anti-collision beam, the motor and the electric cylinder are directly electrically connected to the storage battery on the automobile, and the storage battery provides electric energy for the motor and the electric cylinder.

7. The new energy automobile anti-collision beam assembly according to any one of claims 1 to 6, characterized in that: The abutting spring is a cylindrical helical spring and is a compression spring.

8. The new energy automobile anti-collision beam assembly according to any one of claims 1 to 6, characterized in that: The abutting column is provided with a buffer head, the buffer head is in contact with the front anti-collision beam, and a buffer spring is arranged between the buffer head and the abutting column.

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