Front auxiliary frame and vehicle body reinforcing structure capable of collapsing during direct impact

Abstract

The direct collision collapsing front auxiliary frame comprises longitudinal beams, a front cross beam and a rear cross beam, the two ends of the front cross beam are connected with the longitudinal beams, the two ends of the rear cross beam are connected with the longitudinal beams, and the longitudinal beams, the front cross beam and the rear cross beam are provided with multi-stage collision structures. The multi-stage collision structure can effectively reduce the influence of overhigh strength and rigidity of the front auxiliary frame on crumple energy absorption of the front auxiliary frame in the collision process, so that the front auxiliary frame can normally crumple and absorb part of collision energy when a vehicle is collided, and the multi-stage collision structure can further improve the strength and rigidity of a vehicle body mounting point. The invention further provides a vehicle body reinforcing structure, the vehicle body reinforcing structure comprises a front baffle inner reinforcing plate connected with the front auxiliary frame, a front wall lower reinforcing plate middle supporting plate and a front auxiliary frame rear mounting plate, the structure is simple, the manufacturing cost of the front auxiliary frame and the whole vehicle is reduced, and the vehicle body reinforcing structure is suitable for popularization and application. And the safety performance of the front auxiliary frame and the whole vehicle can be improved.

Description

Technical Field

[0001] The present invention belongs to the field of automotive safety. Specifically, the present invention relates to a frontal collision collapsible front subframe and a body strengthening structure. Background Art

[0002] Frontal collision traffic accidents of automobiles account for more than 50% of the entire automobile collision accidents. Especially today when electric vehicles are becoming increasingly popular, additional protection for the battery is required during a frontal collision of an automobile. If the battery is damaged by a collision, a fire is extremely likely to occur. When an automobile undergoes a frontal collision, it is required that the automobile body has sufficient strength and stiffness and cannot collapse at the first impact. At the same time, it is required that the overall strength and stiffness of the subframe should not be too high, and sufficient collapsible deformation is needed to absorb the collision energy to protect the safety of the occupants and the battery pack.

[0003] The front subframe is a main component for frontal collision and energy absorption of an automobile. As the skeleton of the front and rear axles, it supports and connects components such as the suspension system, engine, and transmission, keeping each assembly in the correct relative position and bearing various loads inside and outside the automobile. The collision characteristics of the front subframe determine the collision characteristics of the whole vehicle. The current front subframe structure is difficult to achieve a balance among overall strength, stiffness, and collapsible deformation. In particular, the collapsible structure usually adopts a single or single-stage structure to achieve, making it difficult to exert the overall performance of the subframe. The strength of the mounting points where the subframe is connected to the body is insufficient, resulting in a large tearing deformation of the body. The front subframe hits the battery pack without deformation, making it difficult to provide sufficient safety guarantee for the collision of the whole vehicle.

[0004] Therefore, in order to improve or solve at least one of the above problems, a frontal collision collapsible front subframe and a body strengthening structure are provided, which can solve the problem that the excessive strength and stiffness of the front subframe affect collapsibility, can solve the problem that the insufficient strength and stiffness of the body mounting points affect the collision performance, are beneficial to improving the reliable durability performance of the front subframe, and are beneficial to reducing the manufacturing cost of the front subframe. Summary of the Invention

[0005] The present invention is made to solve the above problems, and the purpose is to provide a frontal collision collapsible front subframe and a body strengthening structure that can reduce the problem that the excessive strength and stiffness of the front subframe affect collapsibility, can reduce the problem that the insufficient strength and stiffness of the body mounting points affect the collision performance, are beneficial to improving the reliable durability performance of the front subframe, and are beneficial to reducing the manufacturing cost of the front subframe. To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] The present invention provides a frontal collision collapsible front subframe, which has the following characteristics: it includes longitudinal beams, a front cross beam, and a rear cross beam. Both ends of the front cross beam are connected to the longitudinal beams, both ends of the rear cross beam are connected to the longitudinal beams, and multi-stage collision structures are provided on the longitudinal beams, the front cross beam, and the rear cross beam.

[0007] In the front subframe with frontal collision collapse provided by the present invention, it may further have the following features: the longitudinal beams include a left longitudinal beam and a right longitudinal beam, the left longitudinal beam and the right longitudinal beam are respectively arranged on both sides of the front cross beam, the left longitudinal beam includes an upper plate of the left longitudinal beam and a lower plate of the left longitudinal beam connected to the upper plate of the left longitudinal beam; the right longitudinal beam includes an upper plate of the right longitudinal beam and a lower plate of the right longitudinal beam connected to the upper plate of the right longitudinal beam.

[0008] In the front subframe with frontal collision collapse provided by the present invention, it may further have the following features: it further includes a reinforcing lower plate, and the reinforcing lower plate is connected to the front cross beam and the rear cross beam.

[0009] In the front subframe with frontal collision collapse provided by the present invention, it may further have the following features: at one end of the left longitudinal beam close to the front cross beam, a first connection tower is provided, and a left front body mounting point is provided on the first connection tower; at one end of the left longitudinal beam close to the front cross beam, a second connection tower is provided, and a right front body mounting point is provided on the second connection tower, and a left rear body mounting point is provided at the end of the left longitudinal beam far from the front cross beam; a right rear body mounting point is provided at the end of the right longitudinal beam far from the front cross beam, and a first front mounting point and a first rear mounting point of the front control arm are provided on the left longitudinal beam; a second front mounting point and a second rear mounting point of the front control arm are provided on the right longitudinal beam.

[0010] In the front subframe with frontal collision collapse provided by the present invention, it may further have the following features: a Z-direction collapse groove, a Y-direction collapse groove of the upper plate of the left longitudinal beam, and a Z-direction collapse groove of the lower plate of the left longitudinal beam are provided on the left longitudinal beam; a Z-direction collapse groove, a Y-direction collapse groove of the upper plate of the right longitudinal beam, and a Z-direction collapse groove of the lower plate of the right longitudinal beam are provided on the right longitudinal beam.

[0011] In the front subframe with frontal collision collapse provided by the present invention, it may further have the following features: the multi-stage collision structure includes a first-stage collision structure formed by the front end of the right longitudinal beam, the front end of the left longitudinal beam, the front cross beam, the front mounting point of the front control arm, the reinforcing lower plate, and the connection tower.

[0012] In the front subframe with frontal collision collapse provided by the present invention, it may further have the following features: the multi-stage collision structure further includes a second-stage collision structure formed by the rear cross beam, the reinforcing lower plate, and the rear mounting point of the front control arm.

[0013] In the front subframe with frontal collision collapse provided by the present invention, it may further have the following features: the multi-stage collision structure further includes a third-stage collision structure formed by the Z-direction collapse groove of the upper plate of the longitudinal beam, the Y-direction collapse groove of the upper plate of the longitudinal beam, and the Z-direction collapse groove of the lower plate of the longitudinal beam.

[0014] In the front subframe with frontal collision collapse provided by the present invention, it may further have the following features: the multi-stage collision structure further includes a fourth-stage collision structure formed by the rear part of the left longitudinal beam, the rear part of the right longitudinal beam, and the left rear body mounting point.

[0015] The present invention also provides a vehicle body strengthening structure, which has the following characteristics: it includes an inner reinforcement plate of the front fender, a middle support plate of the lower part of the front panel, a rear mounting plate of the front subframe, and the above-mentioned frontal collision collapsible front subframe. The inner reinforcement plate of the front fender is connected to the frontal collision collapsible front subframe, the middle support plate of the lower part of the front panel is connected to the frontal collision collapsible front subframe, and the rear mounting plate of the front subframe is connected to the frontal collision collapsible front subframe.

[0016] The technical effects of the present invention are as follows: The frontal collision collapsible front subframe provided by the present invention includes longitudinal beams, a front cross beam, and a rear cross beam. The two ends of the front cross beam are connected to the longitudinal beams, and the two ends of the rear cross beam are connected to the longitudinal beams. Multi-stage collision structures are provided on the longitudinal beams, the front cross beam, and the rear cross beam. The multi-stage collision structures can effectively reduce the problem that the excessive strength and rigidity of the front subframe affect the collapse and energy absorption of the front subframe during a collision, enabling the front subframe to collapse normally and absorb part of the collision energy when the vehicle collides. The multi-stage collision structures can also improve the strength and rigidity of the vehicle body mounting points, which is beneficial to improving the vehicle collision performance and the reliable durability performance of the front subframe. The present invention also provides a vehicle body strengthening structure, including an inner reinforcement plate of the front fender, a middle support plate of the lower part of the front panel, and a rear mounting plate of the front subframe that are connected to the front subframe. The structure is simple, which is beneficial to reducing the manufacturing costs of the front subframe and the whole vehicle, and is beneficial to improving the safety performance of the front subframe and the whole vehicle. Description of the Drawings

[0017] This specification includes the following drawings, and the shown contents are respectively:

[0018] Figure 1 It is a schematic structural diagram of the frontal collision collapsible front subframe in the embodiment of the present invention;

[0019] Figure 2 It is a schematic structural diagram of the frontal collision collapsible front subframe in the top view direction in the embodiment of the present invention;

[0020] Figure 3 It is a schematic structural diagram of the frontal collision collapsible front subframe in the bottom view direction in the embodiment of the present invention;

[0021] Figure 4 It is a schematic diagram of the connection between the front subframe and the vehicle body strengthening structure in the embodiment of the present invention Figure 1 ;

[0022] Figure 5 It is a schematic diagram of the connection between the front subframe and the vehicle body strengthening structure in the embodiment of the present invention Figure 2 ;

[0023] Figure 6 It is a schematic diagram of the connection between the front subframe and the vehicle body strengthening structure in the bottom view direction in the embodiment of the present invention.

[0024] The markings in the figure are: inner reinforcement plate of front baffle - 1, middle support plate of lower front panel reinforcement - 2, rear mounting plate of front subframe - 3, longitudinal beam - 10, left longitudinal beam - 11, first connection tower - 111, left front mounting point of vehicle body - 112, left rear mounting point of vehicle body - 113, first front mounting point of front control arm - 114, first rear mounting point of front control arm - 115, Z - direction crush groove of upper plate of left longitudinal beam - 116, Y - direction crush groove of upper plate of left longitudinal beam - 117, Z - direction crush groove of lower plate of left longitudinal beam - 118, right longitudinal beam - 12, second connection tower - 121, right front mounting point of vehicle body - 122, right rear mounting point of vehicle body - 123, second front mounting point of front control arm - 124, second rear mounting point of front control arm - 125, Z - direction crush groove of upper plate of right longitudinal beam - 126, Y - direction crush groove of upper plate of right longitudinal beam - 127, Z - direction crush groove of lower plate of right longitudinal beam - 128, front cross beam - 20, rear cross beam - 30, reinforcement lower plate - 40, subframe mounting point sleeve - 50, rear mounting reinforcement plate of front subframe - 60, battery pack bracket - 70. Detailed implementation manners

[0025] The following is a more detailed description of the specific implementation manners of the present invention by referring to the accompanying drawings and describing the embodiments, aiming to help those skilled in the art have a more complete, accurate and in - depth understanding of the inventive concept and technical solutions of the present invention and facilitate its implementation.

[0026] Figure 1 It is a schematic structural diagram of the front subframe with frontal collision crush in the embodiment of the present invention; Figure 2 It is a schematic structural diagram of the front subframe with frontal collision crush in the top - view direction in the embodiment of the present invention; Figure 3 It is a schematic structural diagram of the front subframe with frontal collision crush in the bottom - view direction in the embodiment of the present invention.

[0027] As Figure 1 、 Figure 2 and Figure 3As shown in the figure, the front subframe with positive collision collapse provided by the present invention includes longitudinal beams 10, a front cross beam 20, and a rear cross beam 30. Both ends of the front cross beam 20 are connected to the longitudinal beams 10, and both ends of the rear cross beam 30 are connected to the longitudinal beams 10. Multi-stage collision structures are provided on the longitudinal beams 10, the front cross beam 20, and the rear cross beam 30. The multi-stage collision structures can effectively reduce the problem that the excessive strength and rigidity of the front subframe affect the collapse and energy absorption of the front subframe during a collision, enabling the front subframe to collapse normally and absorb a part of the collision energy when the vehicle collides. When the vehicle collides, the front subframe will fold, bend, and break in a preset manner, converting the kinetic energy generated by the collision into the energy of its own material deformation, thereby reducing the energy transmitted to the vehicle body and the passengers inside the vehicle, and reducing the risk of injury to the passengers inside the vehicle. By reasonably designing the collapse area and structure, the collision force is transmitted along a specific path, avoiding the concentration of force in a certain local area, thereby reducing the damage degree of the vehicle body structure and protecting the key components of the vehicle body from serious damage, and also contributing to maintaining the overall structural stability of the vehicle. The multi-stage collision structures can also improve the strength and rigidity of the vehicle body mounting points, which is beneficial to improving the vehicle collision performance and the reliable durability performance of the front subframe. During the collapse process of the front subframe, it will preferentially bear and buffer the collision force, thereby protecting other important components on the chassis, such as the battery pack, suspension system, steering system, braking system, etc. The battery pack, suspension system, steering system, and braking system play key roles during the normal driving of the vehicle. Protecting the important components from collision damage helps the vehicle maintain a certain degree of maneuverability and stability after a collision, providing the possibility for the driver to take subsequent risk avoidance measures.

[0028] As Figure 1 , Figure 2 and Figure 3 shown, the longitudinal beam 10 includes a left longitudinal beam 11 and a right longitudinal beam 12. The left longitudinal beam 11 and the right longitudinal beam 12 are respectively arranged on both sides of the front cross beam 20. The left longitudinal beam 11 includes a left longitudinal beam upper plate and a left longitudinal beam lower plate connected to the left longitudinal beam upper plate. The left longitudinal beam upper plate and the left longitudinal beam lower plate are connected by a buckling method. A left longitudinal beam cavity structure is formed between the left longitudinal beam upper plate and the left longitudinal beam lower plate. There is a reinforcing plate in the left longitudinal beam cavity structure, which can better guide and control the collapse deformation of the left longitudinal beam 11 on the premise of ensuring the strength and rigidity of the front subframe and can absorb collision energy more effectively; the right longitudinal beam 12 includes a right longitudinal beam upper plate and a right longitudinal beam lower plate connected to the right longitudinal beam upper plate. The right longitudinal beam upper plate and the right longitudinal beam lower plate are connected by a buckling method. A right longitudinal beam cavity structure is formed between the right longitudinal beam upper plate and the right longitudinal beam lower plate. There is a reinforcing plate in the right longitudinal beam cavity structure, which can better guide and control the collapse deformation of the right longitudinal beam 12 on the premise of ensuring the strength and rigidity of the front subframe and can absorb collision energy more effectively.

[0029] The front subframe with frontal crash collapse provided by the present invention further includes a reinforcing lower plate 40. The reinforcing lower plate 40 is connected to the front cross member 20 and the rear cross member 30. The reinforcing lower plate 40 is located between the left longitudinal beam 11 and the right longitudinal beam 12, which is beneficial to improving the structural strength of the front subframe.

[0030] One end of the left longitudinal beam 11 close to the front cross member 20 is provided with a first connection tower 111. A left front body mounting point 112 is provided on the first connection tower 111. One end of the left longitudinal beam 11 away from the front cross member 20 is provided with a left rear body mounting point 113; One end of the right longitudinal beam 12 close to the front cross member 20 is provided with a second connection tower 121. A right front body mounting point 122 is provided on the second connection tower 121. One end of the right longitudinal beam 12 away from the front cross member 20 is provided with a right rear body mounting point 123. The front subframe can be reliably connected to the vehicle body through the left front body mounting point 112, the left rear body mounting point 113, the right front body mounting point 122 and the right rear body mounting point 123, making the front subframe a part of the vehicle body structure. Through the four mounting points, the weight of the front part of the vehicle is reasonably transmitted to the overall vehicle body structure, ensuring the relative position stability among various components during vehicle driving and maintaining the overall structural integrity of the vehicle.

[0031] The left longitudinal beam 11 is provided with a first front mounting point 114 and a first rear mounting point 115 for the front control arm. The right longitudinal beam 12 is provided with a second front mounting point 124 and a second rear mounting point 125 for the front control arm. The first rear mounting point 115 and the second rear mounting point 125 for the front control arm are respectively located on both sides of the rear cross member 30. The front subframe can be conveniently connected to the control arm in the vehicle suspension system through the first front mounting point 114, the first rear mounting point 115, the second front mounting point 124 and the second rear mounting point 125 for the front control arm, which is beneficial to improving the handling performance and comfort of the vehicle during driving and is beneficial to improving the stability of the front subframe during driving.

[0032] The left longitudinal beam 11 is provided with a Z-directional collapse groove 116 on the upper plate of the left longitudinal beam, a Y-directional collapse groove 117 on the upper plate of the left longitudinal beam, and a Z-directional collapse groove 118 on the lower plate of the left longitudinal beam, which are located on the side of the first rear mounting point 115 of the front control arm away from the first front mounting point 114 of the front control arm; the right longitudinal beam 12 is provided with a Z-directional collapse groove 126 on the upper plate of the right longitudinal beam, a Y-directional collapse groove 127 on the upper plate of the right longitudinal beam, and a Z-directional collapse groove 128 on the lower plate of the right longitudinal beam, which are located on the side of the second rear mounting point 125 of the front control arm away from the second front mounting point 124 of the front control arm. The design of multiple collapse grooves enables the front subframe to fold, bend, and break in a preset manner according to the collapse grooves during a vehicle collision, converting the kinetic energy generated by the collision into the energy of its own material deformation, thereby reducing the energy transmitted to the vehicle body and the passengers inside the vehicle, reducing the risk of injury to the passengers inside the vehicle during a collision. By reasonably designing the collapse area and structure, the collision force is transmitted along a specific path, avoiding the concentration of force in a certain local area, thereby reducing the damage degree of the vehicle body structure, protecting the key components of the vehicle body from serious damage, and also helping to maintain the overall structural stability of the vehicle.

[0033] The multi - stage collision structure includes a first - stage collision structure formed by the front end of the right longitudinal beam 11, the front end of the left longitudinal beam 12, the front cross - beam 20, the first front mounting point 114 of the front control arm, the second front mounting point 124 of the front control arm, the reinforcing lower plate 40, the first connection tower 111, and the second connection tower 121; the multi - stage collision structure further includes a second - stage collision structure formed by the rear cross - beam 30, the reinforcing lower plate 40, the first rear mounting point 115 of the front control arm, and the second rear mounting point 125 of the front control arm; the multi - stage collision structure further includes a third - stage collision structure formed by the Z - direction collapse groove 116 of the upper plate of the left longitudinal beam, the Y - direction collapse groove 117 of the upper plate of the left longitudinal beam, the Z - direction collapse groove 118 of the lower plate of the left longitudinal beam on the left longitudinal beam 11, and the Z - direction collapse groove 126 of the upper plate of the right longitudinal beam, the Y - direction collapse groove 127 of the upper plate of the right longitudinal beam, and the Z - direction collapse groove 128 of the lower plate of the right longitudinal beam on the right longitudinal beam 12; the multi - stage collision structure further includes a fourth - stage collision structure formed by the rear part of the left longitudinal beam 11, the rear part of the right longitudinal beam 12, the left rear body mounting point 113, and the right rear body mounting point 123. The multi - stage collision structure forms multiple levels of energy - absorbing regions. When a vehicle collides, it deforms and collapses in a predetermined order, thereby gradually absorbing the collision energy. Compared with a subframe with a single structure, the multi - stage collision structure can make more full use of the materials and space of the subframe, increase the efficiency and total amount of energy absorption, effectively reduce the impact of the collision on the vehicle body and the occupants inside the vehicle, guide the collision force to non - critical areas, reduce the rearward intrusion amount of the front subframe during a collision, and prevent key components from being directly damaged by impact. For example, during a frontal collision, the multi - stage collision structure of the front subframe can deform first, disperse the collision force to other parts of the vehicle body, reduce the damage risk of important components such as the battery pack, thereby improving the reparability and safety of the vehicle after a collision, preventing the collision force from concentrating and causing local excessive deformation or distortion of the vehicle body, enabling the vehicle body to better maintain its original shape, and providing a more complete survival space for the occupants inside the vehicle.

[0034] Figure 4 is a schematic diagram of the connection between the front subframe and the vehicle - body strengthening structure in an embodiment of the present invention Figure 1 ; Figure 5 is a schematic diagram of the connection between the front subframe and the vehicle - body strengthening structure in an embodiment of the present invention Figure 2 ; Figure 6 is a schematic diagram of the connection between the front subframe and the vehicle - body strengthening structure in the bottom - view direction in an embodiment of the present invention.

[0035] Such as Figure 4 、 Figure 5 and Figure 6As shown in the figure, the present invention also provides a vehicle body strengthening structure, including a front baffle inner strengthening plate 1 connected to the front subframe, a middle support plate 2 of the lower part of the front panel, and a rear mounting plate 3 of the front subframe. The structure is simple, which is beneficial to reducing the manufacturing costs of the front subframe and the whole vehicle, and is beneficial to improving the safety performance of the front subframe and the whole vehicle. Subframe mounting point sleeves 50 are provided at the left rear mounting point 113 and the right rear mounting point 123 of the vehicle body. The subframe mounting point sleeves 50 are connected with a rear mounting reinforcement plate 60 of the front subframe through bolts. The rear mounting reinforcement plate 60 of the front subframe is connected with the front baffle inner strengthening plate 1, the middle support plate 2 of the lower part of the front panel, and the rear mounting plate 3 of the front subframe. A battery pack bracket 70 is also provided at the rear mounting point of the vehicle body. The battery pack bracket 70 is connected with the vehicle body through bolts to form a fifth-level collision structure, further reducing the amount of backward intrusion of the front subframe during a collision, preventing the bolts at the rear vehicle body mounting point 11 of the subframe from falling off and hitting the battery pack after a collision, avoiding the occurrence of battery pack short circuit and fire, improving the safety of passengers, protecting the occupants and the battery pack to the greatest extent, reducing the injury of the occupants, improving the safety performance of the whole vehicle, reducing the complexity of the part structure, and reducing the manufacturing cost of the front subframe.

[0036] Functions and effects of the embodiment

[0037] The frontal collision collapse front subframe provided by the present invention includes longitudinal beams 10, a front cross beam 20, and a rear cross beam 30. Both ends of the front cross beam 20 are connected to the longitudinal beams 10, and both ends of the rear cross beam 30 are connected to the longitudinal beams 10. Multi-level collision structures are provided on the longitudinal beams 10, the front cross beam 20, and the rear cross beam 30. The multi-level collision structures can effectively reduce the problem of the excessive strength and rigidity of the front subframe affecting the collapse and energy absorption of the front subframe during a collision, enabling the front subframe to collapse normally and absorb a part of the collision energy when the vehicle collides, so that when the vehicle collides, the front subframe will fold, bend, and break in a preset manner, converting the kinetic energy generated by the collision into the energy of its own material deformation, thereby reducing the energy transmitted to the vehicle body and the passengers in the vehicle and reducing the risk of injury to the occupants in the vehicle. By reasonably designing the collapse area and structure, the collision force is transmitted along a specific path, avoiding the concentration of force in a certain local area, thereby reducing the damage degree of the vehicle body structure and protecting the key components of the vehicle body from serious damage, and also helping to maintain the overall structural stability of the vehicle. The multi-level collision structures can also improve the strength and rigidity of the vehicle body mounting points, which is beneficial to improving the vehicle collision performance and the reliable durability performance of the front subframe. During the collapse process of the front subframe, it will bear and buffer the collision force preferentially, thereby protecting other important components on the chassis, such as the battery pack, the suspension system, the steering system, the braking system, etc. The battery pack, the suspension system, the steering system, and the braking system play key roles during the normal driving of the vehicle. Protecting the important components from collision damage helps the vehicle to still maintain a certain degree of controllability and stability after a collision, providing the possibility for the driver to take subsequent evasive measures.

[0038] Subframe mounting point sleeves 50 are provided at the left rear mounting point 113 and the right rear mounting point 123 of the vehicle body. The subframe mounting point sleeves 50 are bolted to a rear mounting reinforcement plate 60 of the front subframe. The rear mounting reinforcement plate 60 of the front subframe is connected to the inner reinforcement plate 1 of the front baffle, the middle support plate 2 of the lower reinforcement plate of the front panel, and the rear mounting plate 3 of the front subframe. A battery pack bracket 70 is also provided at the rear mounting point of the vehicle body. The battery pack bracket 70 is bolted to the vehicle body to form a fifth-level collision structure, further reducing the amount of rearward intrusion of the front subframe during a collision, preventing the rear body mounting point 11 of the subframe from colliding with the battery pack after the bolt falls off, avoiding short-circuit fire of the battery pack, improving passenger safety, maximizing the protection of the occupants and the battery pack, reducing occupant injuries, improving the safety performance of the whole vehicle, reducing the complexity of the part structure, and reducing the manufacturing cost of the front subframe.

[0039] The present invention has been described exemplarily in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above methods. As long as various non-substantive improvements are made by adopting the method concept and technical solution of the present invention; or without improvement, the above concept and technical solution of the present invention are directly applied to other occasions, they are all within the protection scope of the present invention.

Claims

1. A front subframe for frontal collision collapse, characterized in that: The invention comprises a longitudinal beam (10), a front cross beam (20) and a rear cross beam (30), wherein two ends of the front cross beam (20) are connected to the longitudinal beam (10), and two ends of the rear cross beam (30) are connected to the longitudinal beam (10), and a multi-stage collision structure is provided on the longitudinal beam (10), the front cross beam (20) and the rear cross beam (30).

2. The front subframe for frontal collision collapse according to claim 1, characterized in that: The longitudinal beam (10) comprises a left longitudinal beam (11) and a right longitudinal beam (12), wherein the left longitudinal beam (11) and the right longitudinal beam (12) are respectively arranged on both sides of the front cross beam (20), wherein the left longitudinal beam (11) comprises a left longitudinal beam upper plate and a left longitudinal beam lower plate connected to the left longitudinal beam upper plate; and the right longitudinal beam (12) comprises a right longitudinal beam upper plate and a right longitudinal beam lower plate connected to the right longitudinal beam upper plate.

3. The front subframe for frontal collision collapse according to claim 2, characterized in that: It also includes a reinforcing lower plate (40), wherein the reinforcing lower plate (40) is connected to the front cross beam (20) and the rear cross beam (30).

4. The front subframe for frontal collision collapse according to claim 3, characterized in that: A first connecting tower (111) is provided on one end of the left longitudinal beam (11) close to the front cross beam (20), and a left front mounting point (112) of the vehicle body is provided on the first connecting tower (111); a second connecting tower (121) is provided on one end of the left longitudinal beam (11) close to the front cross beam (20), and a right front mounting point (122) of the vehicle body is provided on the second connecting tower (121); a left rear mounting point (113) of the vehicle body is provided on one end of the left longitudinal beam (11) away from the front cross beam (20); a right rear mounting point (123) of the vehicle body is provided on one end of the right longitudinal beam (12) away from the front cross beam (20); a first front mounting point (114) of a front control arm and a first rear mounting point (115) of a front control arm are provided on the left longitudinal beam (11); and a second front mounting point (124) of a front control arm and a second rear mounting point (125) of a front control arm are provided on the right longitudinal beam (12).

5. The front subframe for frontal collision collapse according to claim 4, characterized in that: The left longitudinal beam (11) is provided with a left longitudinal beam upper plate Z-direction collapse groove (116), a left longitudinal beam upper plate Y-direction collapse groove (117) and a left longitudinal beam lower plate Z-direction collapse groove (118); the right longitudinal beam (12) is provided with a right longitudinal beam upper plate Z-direction collapse groove (126), a right longitudinal beam upper plate Y-direction collapse groove (127) and a right longitudinal beam lower plate Z-direction collapse groove (128).

6. The front subframe for frontal collision collapse according to claim 5, characterized in that: The multi-stage collision structure comprises a first-stage collision structure formed by the front end of the right longitudinal beam (12), the front end of the left longitudinal beam (11), the front cross beam (20), the front mounting point of the front control arm, the reinforced lower plate (40) and the connecting tower.

7. The front subframe for frontal collision collapse according to claim 6, characterized in that: The multi-stage collision structure also includes a second-stage collision structure formed by the rear cross beam (30), the reinforced lower plate (40) and the rear mounting point of the front control arm.

8. The front subframe for frontal collision collapse according to claim 7, characterized in that: The multi-stage collision structure further includes a third-stage collision structure formed by a Z-direction crush groove of a longitudinal beam upper plate, a Y-direction crush groove of a longitudinal beam upper plate, and a Z-direction crush groove of a longitudinal beam lower plate.

9. The front subframe for frontal collision collapse according to claim 8, characterized in that: The multi-stage collision structure also includes a fourth-stage collision structure formed by the rear portion of the left longitudinal beam (11), the rear portion of the right longitudinal beam (12) and a left rear mounting point of the vehicle body.

10. A vehicle body reinforcement structure, characterized in that: It comprises a front fender inner reinforcement plate (1), a front enclosure lower reinforcement plate middle support plate (2), a front subframe rear mounting plate (3) and a front subframe according to any one of claims 1 to 9, wherein the front fender inner reinforcement plate (1) is connected to the front subframe, the front enclosure lower reinforcement plate middle support plate (2) is connected to the front subframe, and the front subframe rear mounting plate (3) is connected to the front subframe.

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