Front auxiliary frame assembly for automobile

Abstract

The invention relates to the technical field of automobile auxiliary frames, and discloses a front auxiliary frame assembly for an automobile, which comprises a front cross beam assembly, the front cross beam assembly comprises a front cross beam main body and a front longitudinal beam main body, and the rear end face of the front longitudinal beam main body is connected with a rear longitudinal beam main body. The rear longitudinal beam main body comprises two forms, namely the bent-knife-shaped rear longitudinal beam body and the <-shaped rear longitudinal beam body, in the assembling process, the front cross beam assembly and the bent-knife-shaped rear longitudinal beam body are combined to form a rear-drive front auxiliary frame shaped like a Chinese character'lu ', and the front cross beam assembly, the <-shaped rear longitudinal beam body, the front suspension main frame and the rear cross beam main body are combined to form a four-drive front auxiliary frame shaped like a Chinese character'lu'. The front cross beam assembly can be matched with a four-wheel-drive front auxiliary frame and a rear-wheel-drive front auxiliary frame, the platform development period is shortened, and the platform development cost is reduced. Besides, the front cross beam main body and the left and right longitudinal beam main bodies are made of gradient materials, so that when the vehicle collides, on one hand, the rigid support can be improved, and on the other hand, the collision energy absorption efficiency is improved through the combined action of the aluminum honeycomb and the foam.

Description

Technical Field

[0001] This invention belongs to the field of automotive subframe technology, and specifically relates to a front subframe assembly for automobiles. Background Technology

[0002] Simply put, a subframe is an intermediate component that connects the suspension system and the vehicle body. It solves the problems of a vehicle's comfort and handling, improving both simultaneously. Moreover, it can form a suspension assembly with the suspension system, facilitating installation and relocation, reducing R&D costs, and increasing technology utilization.

[0003] Currently, in existing technologies, subframes mainly adopt three structural forms: butterfly subframes, semi-frame subframes, and full-frame subframes. The front subframe is typically manufactured using a stamping and welding process, consisting of an upper and lower body welded together, with control arm mounting points integrated into the welded structure. Furthermore, the mounting positions of components such as suspension mounts, stabilizer bars, and steering gears are usually arranged on the plane formed by the upper body. This type of structure is characterized by its light weight, simple manufacturing process, and easy achievement of modal stiffness requirements, and is widely used in traditional vehicle models.

[0004] However, existing front subframe designs are typically only compatible with a single drive type (such as front-wheel drive or rear-wheel drive), requiring different front subframe structures to be developed for different drive types, increasing development costs and time. Furthermore, existing solutions often require additional driveshaft supports or structural layout modifications when adapting to four-wheel drive systems, further impacting versatility and weight reduction goals.

[0005] This patent application is for a front subframe assembly for automobiles. By optimizing the structural layout and mounting point integration method, the front subframe assembly can be adapted to both four-wheel drive and rear-wheel drive models, reducing development costs and time, while ensuring structural rigidity and lightweight requirements. Summary of the Invention

[0006] To address the technical problem that existing front subframe designs typically only accommodate a single drive type (such as front-wheel drive or rear-wheel drive), requiring different front subframe structures to be developed for different drive types, thus increasing development costs and time, this invention provides a front subframe assembly for automobiles that will effectively improve the above-mentioned problems.

[0007] To achieve the above objectives, this invention provides the following technical solution: A front subframe assembly for automobiles is provided, including a front crossbeam assembly, the front crossbeam assembly including a front crossbeam body and a front longitudinal beam body, the front longitudinal beam body having two beams symmetrically arranged on both sides of the front crossbeam body; The rear longitudinal beam body is connected to the end face of the front longitudinal beam body away from the front cross beam body. The rear longitudinal beam body has two beams arranged symmetrically. The rear longitudinal beam body has two forms: a curved rear longitudinal beam body and a ∠-shaped rear longitudinal beam body. The curved rear longitudinal beam bodies are connected at the curved blade head at one end. The inner sides of the ends of the two ∠-shaped rear longitudinal beam bodies near the front longitudinal beam body are connected by the front suspension main frame. The ends of the two ∠-shaped rear longitudinal beam bodies away from the front longitudinal beam body are connected by the rear cross beam body. The front crossbeam assembly is connected to the curved rear longitudinal beam to form a T-shaped rear-wheel drive front subframe. The front crossbeam assembly is connected to the ∠-shaped rear longitudinal beam, the front suspension main frame, and the rear crossbeam body to form a L-shaped four-wheel drive front subframe.

[0008] Preferably, the main body of the front crossbeam is configured as a sandwich structure, with the outer layer consisting of two sets of arc-shaped steel plates overlapping each other, the inner layer having reinforcing ribs connected laterally, and the central cavity being filled with aluminum honeycomb. The aluminum honeycomb is filled with a density gradient, with a lower density in the middle and a higher density extending laterally to both ends. The front longitudinal beam is made of aluminum alloy and filled with foam. The rear longitudinal beam is made of high-strength steel, with several reinforcing rings arranged longitudinally on the top wall of its inner cavity and several macro-fiber composite material patches arranged longitudinally on the bottom wall of its inner cavity.

[0009] Preferably, the front longitudinal beam body includes a left front longitudinal beam body and a right front longitudinal beam body, and the front crossbeam assembly also includes a left control arm bracket, a right control arm bracket, a left front reinforcing plate, a right front reinforcing plate, a left bending arm plate, and a right bending arm plate.

[0010] Preferably, the left control arm bracket includes a left front control arm bracket and a left rear control arm bracket, and the right control arm bracket includes a right front control arm bracket and a right rear control arm bracket.

[0011] Preferably, the left front control arm bracket and the left rear control arm bracket are located at both ends of the outer side of the left front longitudinal beam, and the right front control arm bracket and the right rear control arm bracket are located at both ends of the outer side of the right front longitudinal beam.

[0012] Preferably, the left front reinforcing plate is installed at the connection between the left front longitudinal beam and the rear longitudinal beam, and the right front reinforcing plate is installed at the connection between the right front longitudinal beam and the rear longitudinal beam.

[0013] Preferably, the left bend arm plate is installed on the left front longitudinal beam, and the right bend arm plate is installed on the right front longitudinal beam.

[0014] Preferably, the left bend arm plate includes a left front bend arm plate and a left middle bend arm plate, and the right bend arm plate includes a right front bend arm plate and a right middle bend arm plate.

[0015] Preferably, an air conditioning compressor bracket is connected to the curved rear longitudinal beam, and a front suspension reinforcement plate is connected to the front suspension main frame.

[0016] Preferably, the four-wheel drive front frame and the rear-wheel drive front subframe adopt a segmented welded structure, wherein the non-suspension mounting part adopts an independent sheet stamping design, and the suspension mounting part adopts an independently developed and designed stamping part.

[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. The front crossbeam assembly of this invention includes a front crossbeam body and a front longitudinal beam body. A rear longitudinal beam body is connected to the rear end face of the front longitudinal beam body. The rear longitudinal beam body includes two forms: a curved rear longitudinal beam body and a ∠-shaped rear longitudinal beam body. During the assembly of the front subframe of an electric vehicle, the front crossbeam assembly and the curved rear longitudinal beam body are combined to form a ∠-shaped rear-wheel drive front subframe. The front crossbeam assembly, the ∠-shaped rear longitudinal beam body, the front suspension main frame, and the rear crossbeam body are combined to form a ∠-shaped four-wheel drive front subframe. This allows the front crossbeam assembly to be adapted to both four-wheel drive and rear-wheel drive front subframes, reducing platform development cycle and development costs.

[0018] 2. The front crossbeam and rear longitudinal beam of this invention are made of high-strength steel, while the front longitudinal beam is made of aluminum alloy. The front crossbeam is filled with aluminum honeycomb with gradually varying density, and the front longitudinal beam is filled with foam. Therefore, the front crossbeam and the left and right longitudinal beams adopt a gradient material design to ensure their lightweight and structural rigidity requirements. When a vehicle collides, the high-strength steel of the front crossbeam can, on the one hand, enhance the rigidity support of the crumple zone to resist frontal or rear-end impacts. On the other hand, the front crossbeam and the front longitudinal beam are equivalent to the crumple zone. The density of the aluminum honeycomb is high near the two ends of the front crossbeam and low in the middle to achieve a smooth stress transition. The aluminum honeycomb and foam work together to improve the collision energy absorption efficiency of the front crossbeam assembly.

[0019] 3. The non-suspension mounting part of the present invention adopts an independent sheet stamping part design, and the modular design enables it to be used by multiple vehicle models, making it compatible with the front subframe of four-wheel drive and rear-wheel drive vehicles. This reduces the complexity of molds and manufacturing costs. The suspension mounting part adopts an independently developed stamping part, which is welded to the stamping parts of the other shared parts, thereby reducing platform development costs.

[0020] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the rear-wheel drive front subframe structure provided by the present invention; Figure 2 This is a schematic diagram of the front crossbeam assembly structure provided by the present invention; Figure 3 These are schematic diagrams of the two types of rear crossbeam bodies provided by this invention; Figure 4 This is a perspective view of the rear-wheel drive front subframe structure provided by the present invention; Figure 5 This is a schematic diagram of the four-wheel drive front subframe structure provided by the present invention. Figure 1 ; Figure 6 This is a schematic diagram of the four-wheel drive front subframe structure provided by the present invention. Figure 2 ; Figure 7 This is a perspective view of the four-wheel drive front subframe structure provided by the present invention; Figure 8 This is a schematic cross-sectional view of the front crossbeam body provided by the present invention; Figure 9 This is a schematic diagram of the longitudinal section of the main body of the front crossbeam provided by the present invention; Figure 10 This is a schematic cross-sectional view of the rear longitudinal beam body provided by the present invention.

[0023] Explanation of reference numerals in the attached figures: 1. Front crossbeam main body; 2. Front longitudinal beam main body; 21. Left front longitudinal beam body; 22. Right front longitudinal beam body; 3. Rear longitudinal beam main body; 31. Scimitar-shaped rear longitudinal beam body; 32. ∠-shaped rear longitudinal beam body; 33. Reinforcing ring; 34. Macrofiber composite material patch; 4. Front suspension main frame; 5. Rear crossbeam main body; 6. Left control arm bracket; 61. Left front control arm bracket; 62. Left rear control arm bracket; 7. Right control arm bracket; 71. Right front control arm bracket; 72. Right rear control arm bracket; 8. Left bending arm plate; 81. Left front bending arm plate; 82. Left center bending arm plate; 9. Right bending arm plate; 91. Right front bending arm plate; 92. Right center bending arm plate; 10. Left front reinforcing plate; 11. Right front reinforcing plate; 12. Air conditioning compressor bracket; 13. Front suspension reinforcing plate; 14. Reinforcing rib. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] The same reference numerals in the accompanying drawings denote the same or similar elements, components, or parts, and therefore, repeated descriptions of the same or similar elements, components, or parts may be omitted below. It should also be understood that although terms such as first, second, third, etc., indicating numbers may be used herein to describe various devices, elements, components, or parts, these devices, elements, components, or parts should not be limited by these terms. That is, these terms are only used to distinguish one from another. For example, a first device may also be referred to as a second device, without departing from the essential technical solution of the invention. Furthermore, the terms "and / or" and "and / or" refer to all combinations including any one or more of the listed items.

[0026] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0027] like Figure 2 As shown, the present invention provides a front subframe assembly for automobiles, including a front crossbeam assembly. The front crossbeam assembly includes a front crossbeam body 1 and a front longitudinal beam body 2. The front longitudinal beam body 2 has two beams that are symmetrically arranged on the left and right sides of the front crossbeam body 1. Specifically, the front crossbeam assembly is the core load-bearing structure of the front subframe. The front crossbeam body 1 serves as a transverse load-bearing beam, while the front longitudinal beam body 2 is used to transmit wheel loads, such as braking or impact forces. The left and right ends of the front crossbeam body 1 are connected to the left front longitudinal beam body 21 and the right front longitudinal beam body 22, respectively, forming a rigid frame to maintain the geometric stability of the front subframe.

[0028] like Figure 8 , Figure 9 As shown, the main body 1 of the front crossbeam is set as a sandwich structure. The outer layer is made of two sets of arc-shaped steel plates overlapping each other, and the inner layer is connected by reinforcing ribs 14 in the transverse direction. The central cavity is filled with aluminum honeycomb. The aluminum honeycomb is a density gradient filling design, with a low density in the middle and a high density extending to the left and right ends. Specifically, in the front crossbeam assembly, the front crossbeam body 1 adopts a sandwich structure. Its outer layer consists of two sets of 1.2mm high-strength steel plates overlapping each other. The reinforcing ribs 14 are set inside the cavity formed by the overlapping of the outer steel plates to improve the shear stiffness of the front crossbeam body 1. The cavity is filled with aluminum honeycomb with gradually changing density, so that the density of the aluminum honeycomb is high near the two ends of the front crossbeam body 1 and low in the middle, so as to achieve a smooth transition of stress.

[0029] like Figure 1 As shown, the main body 2 of the front longitudinal beam includes a left front longitudinal beam 21 and a right front longitudinal beam 22, made of aluminum alloy and filled with foam; as Figure 3 As shown, the rear end face of the front longitudinal beam body 2 is connected to the rear longitudinal beam body 3, and the rear longitudinal beam body 3 is made of high-strength steel. Specifically, the front crossbeam body 1 and the rear longitudinal beam body 3 are made of high-strength steel, while the front longitudinal beam body 2 is made of aluminum alloy. Therefore, the front crossbeam body 1 and the left and right longitudinal beam bodies adopt a gradient material design. When a vehicle collides, the high-strength steel material of the front crossbeam body 1 can, on the one hand, improve the rigidity support of the crumple zone and resist frontal or rear-end impacts. On the other hand, the front crossbeam body 1 and the front longitudinal beam body 2 are equivalent to the crumple zone, and the aluminum honeycomb and foam improve the energy absorption efficiency.

[0030] like Figure 10 As shown, the inner top wall of the rear longitudinal beam body 3 has several reinforcing rings 33 arranged longitudinally, and the inner bottom wall has several macro-fiber composite material patches 34 arranged longitudinally. Specifically, the rear longitudinal beam body 3 is also made of two sets of high-strength rigid plates overlapping each other. The reinforcing ring 33 is arranged longitudinally along the inner cavity of the rear longitudinal beam body 3 to improve the structural rigidity of the rear longitudinal beam body 3. A macro fiber composite material patch 34, namely MFC (Macro Fiber Composite) patch, is provided in the inner cavity along the longitudinal direction. It is a composite material formed by embedding piezoelectric ceramic fibers into a flexible polymer matrix. The fiber direction of the patch is consistent with the principal stress direction of the rear longitudinal beam body 3. A fiber optic sensor is arranged near the MFC patch. When the engine vibrates at a certain order, the fiber optic sensor detects the mechanical vibration and generates an electrical signal. According to the feedback of the fiber optic sensor, an anti-phase voltage is applied to make the MFC patch generate micro-vibration, forming an active damping ring, thereby canceling the resonance of the rear longitudinal beam body 3.

[0031] like Figure 3 As shown, the rear end face of the front longitudinal beam body 2 is connected to the rear longitudinal beam body 3. The rear longitudinal beam body 3 has two beams arranged symmetrically. The rear longitudinal beam body 3 has two forms, namely a curved rear longitudinal beam body 31 and a ∠-shaped rear longitudinal beam body 32. Specifically, the rear longitudinal beam body 3 serves as the core load-bearing structure at the rear of the front subframe, used to transfer the dynamic load of the rear suspension system (such as multi-link or torsion beam) to the body longitudinal beam or rear subframe, ensuring a stable force flow path.

[0032] like Figure 1 As shown, the two curved rear longitudinal beams 31 are connected at the curved blade head at the front end. The front crossbeam assembly is connected to the curved rear longitudinal beams 31 to form a T-shaped rear-drive front subframe. An air conditioning compressor bracket 12 is installed at the curved blade head where the two curved rear longitudinal beams 31 are connected at the front end. Specifically, the connection part of the front curved knife heads of the two scimitar-shaped rear longitudinal beam bodies 31 is entirely located in the middle and rear part of the Z-shaped front subframe for rear-wheel drive. An air-conditioning compressor bracket 12 can be provided in the middle of the connection part for installing an air-conditioning compressor. The front crossbeam main body 1, the front longitudinal beam main body 2, and the scimitar-shaped rear longitudinal beam body 31 can form a structure with a closed middle part, and they are combined to form a Z-shaped front subframe for rear-wheel drive, enhancing the overall torsional stiffness. The front crossbeam main body 1, the front longitudinal beam main body 2, and the scimitar-shaped rear longitudinal beam body 31 are combined to form a Z-shaped front subframe for rear-wheel drive.

[0033] As Figure 5 shown, the front end faces of the two ∠-shaped rear longitudinal beam bodies 32 are connected by the front suspension main frame 4, and the rear end faces of the two ∠-shaped rear longitudinal beam bodies 32 are connected by the rear crossbeam main body 5. The front crossbeam assembly is connected to the ∠-shaped rear longitudinal beam body 32, the front suspension main frame 4, and the rear crossbeam main body 5 to form a Lv-shaped front subframe for four-wheel drive; as Figure 6 shown, a front suspension reinforcement plate 13 is connected to the front suspension main frame 4; Specifically, the two ∠-shaped rear longitudinal beam bodies 32 are located in the middle and rear part of the overall front subframe for four-wheel drive, and are designed with a variable cross-section with a gradually changing thickness. The front suspension main frame 4 is located in the middle of the front subframe for four-wheel drive, equivalent to a middle crossbeam, integrating the front suspension mounting points, and its overall stiffness is strengthened by the front suspension reinforcement plate 13. The front crossbeam main body 1, the front longitudinal beam main body 2, the ∠-shaped rear longitudinal beam body 32, the front suspension main frame 4, and the rear crossbeam main body 5 are combined to form a Lv-shaped front subframe for four-wheel drive.

[0034] As Figure 4 shown, it is a three-dimensional structure diagram of the front subframe for rear-wheel drive; The front subframe for rear-wheel drive is entirely Z-shaped, and in terms of structure, it adopts a Z-shaped layout of a single main crossbeam and double-sided longitudinal beams, reducing redundant structures; As Figure 7 shown, it is a three-dimensional structure diagram of the front subframe for four-wheel drive; The front subframe for four-wheel drive is entirely Lv-shaped, and in terms of structure, it adopts a layout of double crossbeams and double-sided longitudinal beams to form a Lv-shaped closed frame, enhancing the overall torsional stiffness, which is superior to the traditional full-frame front subframe for four-wheel drive.

[0035] As Figure 2 shown, the front crossbeam assembly of the front subframe further includes a left control arm bracket 6, a right control arm bracket 7, a left bent arm plate 8, a right bent arm plate 9, a left front reinforcement plate 10, and a right front reinforcement plate 11; Specifically, the left control arm bracket 6 and the right control arm bracket 7 serve as the core mounting interfaces for the control arm, ensuring the accuracy of wheel alignment parameters. The left bending arm plate 8 and the right bending arm plate 9 provide radial movement space for front wheel steering or drive shaft arrangement, while avoiding installation interference between the longitudinal beam body and the vehicle body during actual installation. The left front reinforcing plate 10 and the right front reinforcing plate 11 cover the high-stress area at the connection between the front longitudinal beam body 2 and the rear longitudinal beam body 3, which can guide the force flow path and reduce the amount of longitudinal beam collapse deformation in a frontal collision.

[0036] Specifically, the left control arm bracket 6 and the right control arm bracket 7 transmit the vertical force, lateral force and braking torque on the wheel to the front crossbeam body 1 through the bracket. The left control arm bracket 6 includes a left front control arm bracket 61 and a left rear control arm bracket 62, and the right control arm bracket 7 includes a right front control arm bracket 71 and a right rear control arm bracket 72. The left front control arm bracket 61 and the left rear control arm bracket 62 are located at the front and rear ends of the outer side of the left front longitudinal beam 21, respectively, and the right front control arm bracket 71 and the right rear control arm bracket 72 are located at the front and rear ends of the outer side of the right front longitudinal beam 22, respectively. Specifically, the left bend arm plate 8 is installed on the left front longitudinal beam 21, and the right bend arm plate 9 is installed on the right front longitudinal beam 22. Due to the different installation positions, the left bend arm plate 8 includes the left front bend arm plate 81 and the left middle bend arm plate 82, and the right bend arm plate 9 includes the right front bend arm plate 91 and the right middle bend arm plate 92. Specifically, the left front reinforcing plate 10 is installed at the connection between the left front longitudinal beam 21 and the rear longitudinal beam body 3, and the right front reinforcing plate 11 is installed at the connection between the right front longitudinal beam 22 and the rear longitudinal beam body 3. The reinforcing plate adopts a weight reduction hole design to balance performance and weight.

[0037] Furthermore, both the four-wheel drive front subframe and the rear-wheel drive front subframe adopt a segmented welded structure. The non-suspension mounting parts adopt an independent sheet stamping design, while the suspension mounting parts adopt independently developed and designed stamping parts. Specifically, for example, the front crossbeam main body 1, the front longitudinal beam main body 2, the rear longitudinal beam main body 3, the rear crossbeam main body 5, the left and right control arm brackets, and the left and right curved arm plates are all non-suspension mounting parts. The non-suspension mounting parts adopt an independent sheet stamping design. The main body of the front crossbeam assembly can be welded from 2-3 large-size stamping parts. Through modular design, it can be shared by multiple models, making it compatible with the front subframe of four-wheel drive and rear-wheel drive, which can reduce mold complexity and manufacturing costs. The front suspension main frame 4 and the front suspension reinforcement plate 13 are suspension mounting parts. The suspension mounting parts adopt independently developed and designed stamping parts, which are welded with the stamping parts of the other shared parts, reducing platform development costs.

[0038] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A front subframe assembly for automobiles, comprising a front crossbeam assembly, characterized in that: The front crossbeam assembly includes a front crossbeam body (1) and a front longitudinal beam body (2). The front longitudinal beam body (2) has two beams that are symmetrically arranged on both sides of the front crossbeam body (1). The end face of the front longitudinal beam body (2) away from the front crossbeam body (1) is connected to the rear longitudinal beam body (3). The rear longitudinal beam body (3) has two beams arranged symmetrically. The rear longitudinal beam body (3) has two forms, namely a curved rear longitudinal beam body (31) and a ∠-shaped rear longitudinal beam body (32). The two curved rear longitudinal beam bodies (31) are connected at one end of the curved blade head. The inner side of the two ∠-shaped rear longitudinal beam bodies (32) near the front longitudinal beam body (2) is connected by the front suspension main frame (4). The end face of the two ∠-shaped rear longitudinal beam bodies (32) away from the front longitudinal beam body (2) is connected by the rear crossbeam body (5). The front crossbeam assembly and the curved rear longitudinal beam (31) are connected to form a U-shaped rear-drive front subframe. The rear longitudinal beam (32), the front suspension main frame (4), and the rear cross beam (5) are connected to form a L-shaped four-wheel drive front subframe.

2. The front subframe assembly for automobiles according to claim 1, characterized in that: The main body of the front crossbeam (1) is set as a sandwich structure. The outer layer is made of two sets of arc-shaped steel plates overlapping each other, and the inner layer is connected with reinforcing ribs (14) in the transverse direction. The central cavity is filled with aluminum honeycomb. The aluminum honeycomb is filled with density gradient, with a small density in the middle and a large density extending laterally to both ends. The front longitudinal beam body (2) is made of aluminum alloy and its interior is filled with foam. The rear longitudinal beam body (3) is made of high-strength steel and its inner cavity top wall has several reinforcing rings (33) arranged longitudinally, and its inner cavity bottom wall has several macro fiber composite material patches (34) arranged longitudinally.

3. The front subframe assembly for automobiles according to claim 1, characterized in that: The front longitudinal beam body (2) includes a left front longitudinal beam body (21) and a right front longitudinal beam body (22). The front crossbeam assembly also includes a left control arm bracket (6), a right control arm bracket (7), a left bending arm plate (8), a right bending arm plate (9), a left front reinforcing plate (10), and a right front reinforcing plate (11).

4. The front subframe assembly for automobiles according to claim 3, characterized in that: The left control arm bracket (6) includes a left front control arm bracket (61) and a left rear control arm bracket (62), and the right control arm bracket (7) includes a right front control arm bracket (71) and a right rear control arm bracket (72).

5. The front subframe assembly for automobiles according to claim 4, characterized in that: The left front control arm bracket (61) and the left rear control arm bracket (62) are located at the two ends of the outer side of the left front longitudinal beam (21), and the right front control arm bracket (71) and the right rear control arm bracket (72) are located at the two ends of the outer side of the right front longitudinal beam (22).

6. The front subframe assembly for automobiles according to claim 3, characterized in that: The left curved arm plate (8) is installed on the left front longitudinal beam (21), and the right curved arm plate (9) is installed on the right front longitudinal beam (22).

7. The front subframe assembly for automobiles according to claim 3, characterized in that: The left bend arm plate (8) includes a left front bend arm plate (81) and a left middle bend arm plate (82), and the right bend arm plate (9) includes a right front bend arm plate (91) and a right middle bend arm plate (92).

8. The front subframe assembly for automobiles according to claim 3, characterized in that: The left front reinforcing plate (10) is installed at the connection between the left front longitudinal beam (21) and the rear longitudinal beam body (3), and the right front reinforcing plate (11) is installed at the connection between the right front longitudinal beam (22) and the rear longitudinal beam body (3).

9. The front subframe assembly for automobiles according to claim 1, characterized in that: An air conditioning compressor bracket (12) is connected to the curved rear longitudinal beam (31), and a front suspension reinforcement plate (13) is connected to the front suspension main frame (4).

10. A front subframe assembly for automobiles according to claim 1, characterized in that: The four-wheel drive front subframe and the rear-wheel drive front subframe adopt a segmented welded structure.

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