Front auxiliary frame structure, chassis and vehicle

Abstract

The utility model provides a front auxiliary frame structure, a chassis and a vehicle, which comprises a first front auxiliary frame longitudinal beam, a second front auxiliary frame longitudinal beam, a first front auxiliary frame cross beam, a second front auxiliary frame cross beam and a front auxiliary frame rear cross beam, one end of the front auxiliary frame rear cross beam is connected with a groove of the first front auxiliary frame longitudinal beam, the other end of the first front auxiliary frame cross beam is connected with one end of the second front auxiliary frame longitudinal beam through the front auxiliary frame connecting assembly, and the other end of the front auxiliary frame rear cross beam is connected with a groove of the second front auxiliary frame longitudinal beam. One end of the second front auxiliary frame cross beam is connected with one end of the first front auxiliary frame longitudinal beam through the front auxiliary frame connecting assembly, and the other end of the second front auxiliary frame cross beam is connected with the other end of the second front auxiliary frame longitudinal beam through the front auxiliary frame connecting assembly. According to the utility model, the assembly complexity is reduced, the whole structure is not easy to deform, and the control stability of a vehicle is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of automobile, specifically discloses a front subframe structure, chassis and vehicle. BACKGROUND

[0002] With the rapid development of automobile industry, the safety, comfort and fuel economy of vehicle have become important factors in automobile design. In these aspects, the chassis structure of vehicle not only needs to support the weight of the whole vehicle, but also needs to withstand various impacts and loads from the road, while ensuring the handling and riding comfort of the vehicle. Especially the front subframe, as an important part connecting the front suspension system and the vehicle body, its structural design directly affects the handling stability and riding comfort of the vehicle. The traditional front subframe structure usually adopts a simple beam design. Although this design has certain advantages in cost, it has many shortcomings in actual application. First of all, the stiffness and strength of the traditional beam structure often cannot meet the increasingly strict safety standards and performance requirements. At high speed or during intense driving, this structure is easy to deform, affecting the handling stability of the vehicle. Secondly, the weight of the traditional front subframe is large, which not only increases the overall weight of the vehicle, but also affects the economy and dynamic response. In addition, the connection method of the traditional front subframe is complex, involving multiple components and connection points, which not only increases the assembly difficulty, but also increases the maintenance and replacement cost. Therefore, developing a new type of front subframe structure to improve the handling performance and riding comfort of the vehicle, while reducing the weight and cost, has become an important demand for the development of automobile industry.

[0003] In view of the deficiencies of the prior art, the utility model provides an optimized front subframe structure, which aims to improve the stiffness and strength of the front subframe, reduce the weight and simplify the connection method, so as to improve the performance and economy of the whole vehicle through innovative design. SUMMARY

[0004] The utility model discloses a front subframe structure, chassis and vehicle to solve the problem of high assembly difficulty, easy deformation of structure and influence on the handling stability of vehicle.

[0005] The utility model provides a kind of front subframe structure, including first front subframe longitudinal beam, second front subframe longitudinal beam, first front subframe crossbeam, second front subframe crossbeam, front subframe rear crossbeam and front subframe connecting assembly, the first front subframe crossbeam one end is connected with the first front subframe longitudinal beam one end by the front subframe connecting assembly, the first front subframe longitudinal beam other end is equipped with recess, the recess of the first front subframe longitudinal beam is connected with the front subframe rear crossbeam one end, the other end of the second front subframe longitudinal beam is equipped with recess, the recess of the second front subframe longitudinal beam is connected with the front subframe rear crossbeam other end, the first front subframe longitudinal beam one end is connected with the first front subframe longitudinal beam one end by the front subframe connecting assembly, the other end of the second front subframe crossbeam is connected with the other end of the second front subframe longitudinal beam by the front subframe connecting assembly, the second front subframe crossbeam is set between the first front subframe crossbeam and front subframe rear crossbeam.

[0006] According to the front subframe structure of some embodiments of the application, the front subframe connecting assembly includes a first front subframe connecting piece, a second front subframe connecting piece, a third front subframe connecting piece and a fourth front subframe connecting piece, the first front subframe crossbeam is connected with the first front subframe longitudinal beam through the first front subframe connecting piece, the first front subframe crossbeam is connected with the second front subframe longitudinal beam through the second front subframe connecting piece, the second front subframe crossbeam is connected with the first front subframe longitudinal beam through the third front subframe connecting piece, and the second front subframe crossbeam is connected with the second front subframe longitudinal beam through the fourth front subframe connecting piece.

[0007] According to the front subframe structure of some embodiments of the application, the first front subframe connecting piece, the second front subframe connecting piece, the third front subframe connecting piece and the fourth front subframe connecting piece are all aluminum alloy extruded profiles, which are prepared by extrusion.

[0008] According to the front subframe structure of some embodiments of the application, the first front subframe connecting piece includes a first connecting piece first buckle and a first connecting piece second buckle connected with each other, the first connecting piece first buckle and the first connecting piece second buckle are both U-shaped and oppositely arranged, the first connecting piece first buckle is wrapped on the outer surface of the first front subframe longitudinal beam, and the first connecting piece second buckle is wrapped on the outer surface of the first front subframe crossbeam.

[0009] The second front subframe connecting piece comprises a second connecting piece first buckle and a second connecting piece second buckle connected with each other, both of which are in the shape of a U and oppositely arranged with openings, the second connecting piece first buckle is wrapped on the outer surface of the second front subframe longitudinal beam part, and the second connecting piece second buckle is wrapped on the outer surface of the first front subframe cross beam part.

[0010] The third front subframe connecting piece comprises a third connecting piece first buckle and a third connecting piece second buckle connected with each other, both of which are in the shape of a U and oppositely arranged with openings, the third connecting piece first buckle is wrapped on the outer surface of the first front subframe longitudinal beam part, and the third connecting piece second buckle is wrapped on the outer surface of the second front subframe cross beam part.

[0011] The fourth front subframe connecting piece comprises a fourth connecting piece first buckle and a fourth connecting piece second buckle connected with each other, both of which are in the shape of a U and oppositely arranged with openings, the fourth connecting piece first buckle is wrapped on the outer surface of the second front subframe longitudinal beam part, and the fourth connecting piece second buckle is wrapped on the outer surface of the second front subframe cross beam part.

[0012] According to the front subframe structure of some embodiments of the present application, the first connecting piece first buckle is connected with the first front subframe longitudinal beam through welding, and the first connecting piece second buckle is connected with the first front subframe cross beam through welding.

[0013] The second connecting piece first buckle is connected with the second front subframe longitudinal beam through welding, and the second connecting piece second buckle is connected with the first front subframe cross beam through welding.

[0014] The third connecting piece first buckle is connected with the first front subframe longitudinal beam through welding, and the third connecting piece second buckle is connected with the second front subframe cross beam through welding.

[0015] The fourth connecting piece first buckle is connected with the second front subframe longitudinal beam through welding, and the fourth connecting piece second buckle is connected with the second front subframe cross beam through welding.

[0016] According to the front subframe structure of some embodiments of the present application, the outer side of the first front subframe longitudinal beam is provided with a first front swing arm, the first front swing arm is connected with the first front subframe longitudinal beam through a first front subframe swing arm mounting support, and the first front swing arm comprises two legs, and the two legs are respectively connected with the first front subframe longitudinal beam through two first front subframe swing arm mounting supports.

[0017] The second front swing arm is connected with the second front subframe longitudinal beam through a second front subframe swing arm mounting bracket, and the second front swing arm comprises two legs connected with the second front subframe longitudinal beam through two second front subframe swing arm mounting brackets respectively.

[0018] The first front swing arm is connected with the first front subframe swing arm mounting bracket through a bolt, and the first front swing arm is an aluminum alloy extruded profile prepared through an extrusion mode.

[0019] The second front swing arm is connected with the second front subframe swing arm mounting bracket through a bolt, and the second front swing arm is an aluminum alloy extruded profile prepared through an extrusion mode.

[0020] According to the front subframe structure of some embodiments of the present application, the first front subframe longitudinal beam and the second front subframe longitudinal beam are both square tube structures and are internally provided with reinforcing ribs, and the first front subframe longitudinal beam and the second front subframe longitudinal beam are both aluminum alloy extruded profiles prepared through an extrusion mode.

[0021] According to the front subframe structure of some embodiments of the present application, the first front subframe longitudinal beam and the second front subframe longitudinal beam are both square tube structures and are internally provided with reinforcing ribs, and the first front subframe longitudinal beam and the second front subframe longitudinal beam are both aluminum alloy extruded profiles prepared through an extrusion mode.

[0022] The utility model also provides a chassis, the chassis includes above-mentioned front subframe structure.

[0023] The utility model also provides a vehicle, the vehicle above-mentioned chassis.

[0024] The front subframe structure provided by the utility model has the advantages that the design of the longitudinal beam and the cross beam is optimized, the greater load can be borne while the sufficient rigidity and strength are ensured, the control stability of the vehicle is improved, the connection mode is simplified compared with the traditional structure in the design of the front subframe connecting assembly, the complexity of assembly and maintenance is reduced, the cost is reduced, meanwhile, the structure adopts the lightweight material and the structural design, the weight of the front subframe is effectively reduced, so the whole vehicle quality is reduced, the economy is improved, in addition, the optimized front subframe structure can better absorb and disperse the impact from the road surface, the riding comfort is improved, the impact force can be effectively dispersed when the collision occurs, the passenger safety is protected, in addition, the simplified front subframe connection mode and the optimized structural design make the production process more efficient, the manufacturing period is shortened, the maintenance of the front subframe is more convenient, and the maintenance cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a three-dimensional structure schematic view of a front subframe structure of an embodiment of the utility model;

[0026] Figure 2 It is a three-dimensional structure schematic view of a first front subframe connecting piece of an embodiment of the utility model.

[0027] In the drawing, 1, first front subframe connecting piece, 2, second front subframe connecting piece, 3, third front subframe connecting piece, 4, fourth front subframe connecting piece, 5, first front subframe longitudinal beam, 6, second front subframe longitudinal beam, 7, first front subframe cross beam, 8, second front subframe cross beam, 9, rear cross beam of front subframe, 10, first front swing arm, 11, second front swing arm, 12, first front subframe swing arm mounting bracket, 13, second front subframe swing arm mounting bracket. DETAILED DESCRIPTION

[0028] The embodiment of the utility model will be further described in detail in combination with the drawings and the embodiment. The following embodiment is used to illustrate the utility model, but cannot be used to limit the range of the utility model.

[0029] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0030] This embodiment provides a front subframe structure, such as Figure 1 As shown, the system includes a first front subframe longitudinal beam 5, a second front subframe longitudinal beam 6, a first front subframe crossbeam 7, a second front subframe crossbeam 8, a front subframe rear crossbeam 9, and a front subframe connecting assembly. One end of the first front subframe crossbeam 7 is connected to one end of the first front subframe longitudinal beam 5 via the front subframe connecting assembly. The other end of the first front subframe longitudinal beam 5 has a groove. One end of the front subframe rear crossbeam 9 is connected to the groove of the first front subframe longitudinal beam 5, and the other end of the first front subframe crossbeam 7 is connected to one end of the second front subframe longitudinal beam 6. The second front subframe longitudinal beam 6 is connected via a front subframe connecting assembly. The other end of the second front subframe longitudinal beam 6 is provided with a groove. The other end of the front subframe rear crossbeam 9 is connected to the groove of the second front subframe longitudinal beam 6. One end of the second front subframe crossbeam 8 is connected to one end of the first front subframe longitudinal beam 5 via the front subframe connecting assembly. The other end of the second front subframe crossbeam 8 is connected to the other end of the second front subframe longitudinal beam 6 via the front subframe connecting assembly. The second front subframe crossbeam 8 is located between the first front subframe crossbeam 7 and the front subframe rear crossbeam 9.

[0031] As a preferred embodiment, the front subframe connection assembly includes a first front subframe connector 1, a second front subframe connector 2, a third front subframe connector 3, and a fourth front subframe connector 4. The first front subframe crossbeam 7 is connected to the first front subframe longitudinal beam 5 through the first front subframe connector 1. The first front subframe crossbeam 7 is connected to the second front subframe longitudinal beam 6 through the second front subframe connector 2. The second front subframe crossbeam 8 is connected to the first front subframe longitudinal beam 5 through the third front subframe connector 3. The second front subframe crossbeam 8 is connected to the second front subframe longitudinal beam 6 through the fourth front subframe connector 4.

[0032] As a preferred embodiment, specifically, the first front subframe connector 1, the second front subframe connector 2, the third front subframe connector 3, and the fourth front subframe connector 4 are all made of extruded aluminum alloy profiles, manufactured by extrusion. More specifically, such as Figure 2 As shown, the first front subframe connector 1 includes a first connector first buckle and a first connector second buckle connected to each other. Both the first connector first buckle and the first connector second buckle are U-shaped and their openings are arranged opposite to each other. The first connector first buckle covers the outer surface of the first front subframe longitudinal beam 5 portion, and the first connector second buckle covers the outer surface of the first front subframe crossbeam 7 portion. The second front subframe connector 2 includes a second connector first buckle and a second connector second buckle connected to each other. Both the second connector first buckle and the second connector second buckle are U-shaped and their openings are arranged opposite to each other. The second connector first buckle covers the outer surface of the second front subframe longitudinal beam 6 portion, and the second connector second buckle covers the outer surface of the first front subframe crossbeam 7 portion. The third front subframe connector 3 includes a first and a second third connector clip connected to each other. Both the first and second third connector clips are U-shaped with their openings facing away from each other. The first third connector clip covers the outer surface of a portion of the first front subframe longitudinal beam 5, and the second third connector clip covers the outer surface of a portion of the second front subframe crossbeam 8. The fourth front subframe connector 4 includes a first and a second fourth connector clip connected to each other. Both the first and second fourth connector clips are U-shaped with their openings facing away from each other. The first fourth connector clip covers the outer surface of a portion of the second front subframe longitudinal beam 6, and the second fourth connector clip covers the outer surface of a portion of the second front subframe crossbeam 8. The clip design makes the connection between components more secure and also enhances the overall structural strength. More preferably, the first front subframe connector 1, the second front subframe connector 2, the third front subframe connector 3, and the fourth front subframe connector 4 have the same structure, which can save mold opening costs.

[0033] As a preferred embodiment of the present embodiment, specifically, the first connecting piece first buckle is connected with the first front subframe longitudinal beam 5 by welding, and the first connecting piece second buckle is connected with the first front subframe transverse beam 7 by welding; the second connecting piece first buckle is connected with the second front subframe longitudinal beam 6 by welding, and the second connecting piece second buckle is connected with the first front subframe transverse beam 7 by welding; the third connecting piece first buckle is connected with the first front subframe longitudinal beam 5 by welding, and the third connecting piece second buckle is connected with the second front subframe transverse beam 8 by welding; the fourth connecting piece first buckle is connected with the second front subframe longitudinal beam 6 by welding, and the fourth connecting piece second buckle is connected with the second front subframe transverse beam 8 by welding.

[0034] As a preferred embodiment of the present embodiment, more specifically, the first front subframe longitudinal beam 5 is provided with a first front swing arm 10 on the outside, the first front swing arm 10 is connected with the first front subframe longitudinal beam 5 through a first front subframe swing arm mounting bracket 12, the first front swing arm 10 includes two feet, and the two feet are respectively connected with the first front subframe longitudinal beam 5 through two first front subframe swing arm mounting brackets 12; the second front subframe longitudinal beam 6 is provided with a second front swing arm 11 on the outside, the second front swing arm 11 is connected with the second front subframe longitudinal beam 6 through a second front subframe swing arm mounting bracket 13, the second front swing arm 11 includes two feet, and the two feet are respectively connected with the second front subframe longitudinal beam 6 through two second front subframe swing arm mounting brackets 13; the first front subframe swing arm mounting bracket 12 is connected with the first front subframe longitudinal beam 5 by welding, the first front swing arm 10 is connected with the first front subframe swing arm mounting bracket 12 by bolts, and the first front swing arm 10 is an aluminum alloy extruded profile and is made by extrusion; the second front subframe swing arm mounting bracket 13 is connected with the second front subframe longitudinal beam 6 by welding, the second front swing arm 11 is connected with the second front subframe swing arm mounting bracket 13 by bolts, and the second front swing arm 11 is an aluminum alloy extruded profile and is made by extrusion.

[0035] As a preferred embodiment of the present embodiment, specifically, the first front subframe longitudinal beam 5 and the second front subframe longitudinal beam 6 are both square tube structures and are provided with reinforcing ribs inside, and the first front subframe longitudinal beam 5 and the second front subframe longitudinal beam 6 are both aluminum alloy extruded profiles and are made by extrusion. The first front subframe transverse beam 7, the second front subframe transverse beam 8 and the rear subframe transverse beam 9 are all square tube structures and are provided with reinforcing ribs inside, and the first front subframe transverse beam 7, the second front subframe transverse beam 8 and the rear subframe transverse beam 9 are all aluminum alloy extruded profiles and are made by extrusion. The rear subframe transverse beam 9 is connected with the first front subframe transverse beam 7 and the second front subframe transverse beam 8 by welding.

[0036] The present embodiment also provides a chassis comprising the above-mentioned front subframe structure, lower vehicle body structure, battery tray structure and rear subframe structure.

[0037] The embodiment also provides a vehicle, which comprises the chassis.

[0038] In addition, as a preferred embodiment of the present application, the first front subframe longitudinal beam 5, the first front swing arm 10, the second front subframe longitudinal beam 6, the second front swing arm 11, the first front subframe connecting piece 1, the second front subframe connecting piece 2, the third front subframe connecting piece 3, the fourth front subframe connecting piece 4, the first front subframe cross beam 7, the second front subframe cross beam 8 and the rear cross beam 9 of the front subframe are all made of AL-Si alloy, and more specifically, the above components are all made of 6082 aluminum alloy. The yield of the extrusion of 6082 aluminum alloy can reach 250 Mpa or more, which is much higher than the yield strength of ordinary castings.

[0039] In the embodiment, all the cross beams and longitudinal beams are made of high-strength multi-cavity extruded profiles, which can further improve the performance of the product. First, the multiple cavities of the longitudinal beam are multiple single pipes combined together. In mechanics, there is a saying of supporting a column with a column, and at the same time, these single pipes are stacked together, and the mechanical properties are also increased by several times. Second, the cross beam structure is that the front section of the cross beam adopts a large plane, and the inside is provided with multiple inclined reinforcing ribs, forming multiple triangles. The triangular space structure is the most stable, and can well support and transmit force, ensuring the overall rigidity and strength of the cross beam.

[0040] The front subframe structure of the present application has obvious rigidity improvement effect compared with the existing steel-aluminum hybrid front subframe structure and all-steel front subframe structure, and has higher structural strength. In addition, although the existing integrated die-cast lower vehicle body chassis simplifies more than 70 welded parts of the original rear bottom plate into one part, it is still limited by the disadvantages of equipment cost, precision control, maintenance difficulty, casting defects, manufacturing limitations, environmental impact, etc. in actual application, and the technology must be based on mass production as a prerequisite, otherwise the high equipment investment and mold cost cannot be amortized. From the economic point of view, the front subframe structure of the present application is more cost-saving.

[0041] The high-strength aluminum alloy multi-cavity structure section ring composite light beam pulse laser welding technology of the core parts of the front subframe structure of the embodiment is based on the part material, welding structure, welding technology and the like, and is developed from the direction of improving the joint performance of the welded part, adopts the multi-cavity complex structure extruded section instead of the traditional cast aluminum alloy, innovates the welding technology, and develops the ring composite light beam pulse laser welding technology. The ring composite light beam pulse laser welding technology designs a ring composite light beam, forms a larger and more stable keyhole, and makes the metal vapor more easily escape; can maximally reduce the pollution of molten metal, improves the welding speed, reduces the spatter by 90% or more, stably melts the pool and controls the cooling to overcome the shrinkage stress, realizes the crack-free welding, adjusts the welding process parameters according to the part weld quality, post-weld mechanical property and the like, analyzes the influence law of different welding process parameters on the weld forming, and solves the problems of complex casting process, many material defects and the like affecting the performance of the chassis manufacturing.

[0042] Embodiments of the present application are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the application to the forms disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. Embodiments were chosen and described in order to best explain the principles of the application and its practical application, and to enable others skilled in the art to understand the application for various embodiments with various modifications as are suited to the particular use contemplated.

Claims

1. A front subframe structure characterized by comprising: The front subframe connecting assembly comprises a first front subframe connecting piece (1), a second front subframe connecting piece (2), a third front subframe connecting piece (3) and a fourth front subframe connecting piece (4), the first front subframe cross beam (7) is connected with the first front subframe longitudinal beam (5) through the first front subframe connecting piece (1), the first front subframe cross beam (7) is connected with the second front subframe longitudinal beam (6) through the second front subframe connecting piece (2), the second front subframe cross beam (8) is connected with the first front subframe longitudinal beam (5) through the third front subframe connecting piece (3), and the second front subframe cross beam (8) is connected with the second front subframe longitudinal beam (6) through the fourth front subframe connecting piece (4).

2. The front subframe structure according to claim 1, characterized by The first front subframe connecting piece (1), the second front subframe connecting piece (2), the third front subframe connecting piece (3) and the fourth front subframe connecting piece (4) are all aluminum alloy extruded profiles and are prepared through extrusion.

3. The front subframe structure according to claim 2, characterized by The first front subframe connecting piece (1) comprises a first connecting piece first buckle and a first connecting piece second buckle which are connected with each other, the first connecting piece first buckle and the first connecting piece second buckle are both in the shape of a U and are oppositely arranged, the first connecting piece first buckle is wrapped on the outer surface of the first front subframe longitudinal beam (5), and the first connecting piece second buckle is wrapped on the outer surface of the first front subframe cross beam (7).

4. The front subframe structure according to claim 2, characterized by ​ The second front subframe connecting piece (2) comprises a second connecting piece first buckle and a second connecting piece second buckle connected with each other, both of which are in the shape of a concave and have openings arranged oppositely, the second connecting piece first buckle is wrapped on the outer surface of the second front subframe longitudinal beam (6), and the second connecting piece second buckle is wrapped on the outer surface of the first front subframe cross beam (7); The third front subframe connecting piece (3) comprises a third connecting piece first buckle and a third connecting piece second buckle connected with each other, both of which are in the shape of a concave and have openings arranged oppositely, the third connecting piece first buckle is wrapped on the outer surface of the first front subframe longitudinal beam (5), and the third connecting piece second buckle is wrapped on the outer surface of the second front subframe cross beam (8); The fourth front subframe connecting piece (4) comprises a fourth connecting piece first buckle and a fourth connecting piece second buckle connected with each other, both of which are in the shape of a concave and have openings arranged oppositely, the fourth connecting piece first buckle is wrapped on the outer surface of the second front subframe longitudinal beam (6), and the fourth connecting piece second buckle is wrapped on the outer surface of the second front subframe cross beam (8).

5. The front subframe structure according to claim 4, characterized by The first connecting piece first buckle is connected with the first front subframe longitudinal beam (5) through welding, and the first connecting piece second buckle is connected with the first front subframe cross beam (7) through welding; The second connecting piece first buckle is connected with the second front subframe longitudinal beam (6) through welding, and the second connecting piece second buckle is connected with the first front subframe cross beam (7) through welding; The third connecting piece first buckle is connected with the first front subframe longitudinal beam (5) through welding, and the third connecting piece second buckle is connected with the second front subframe cross beam (8) through welding; The fourth connecting piece first buckle is connected with the second front subframe longitudinal beam (6) through welding, and the fourth connecting piece second buckle is connected with the second front subframe cross beam (8) through welding.

6. The front subframe structure according to claim 1, characterized by The first front subframe longitudinal beam (5) is provided with a first front swing arm (10) on the outer side, the first front swing arm (10) is connected with the first front subframe longitudinal beam (5) through a first front subframe swing arm mounting bracket (12), and the first front swing arm (10) comprises two legs connected with the first front subframe longitudinal beam (5) through two first front subframe swing arm mounting brackets (12) respectively; The second front subframe longitudinal beam (6) is provided with a second front swing arm (11) on the outer side, the second front swing arm (11) is connected with the second front subframe longitudinal beam (6) through a second front subframe swing arm mounting bracket (13), and the second front swing arm (11) comprises two legs connected with the second front subframe longitudinal beam (6) through two second front subframe swing arm mounting brackets (13) respectively; The first front subframe swing arm mounting bracket (12) is connected with the first front subframe longitudinal beam (5) by welding, the first front swing arm (10) is connected with the first front subframe swing arm mounting bracket (12) by bolting, and the first front swing arm (10) is an aluminum alloy extruded profile prepared by extrusion. The second front subframe swing arm mounting bracket (13) is connected with the second front subframe longitudinal beam (6) by welding, the second front swing arm (11) is connected with the second front subframe swing arm mounting bracket (13) by bolting, and the second front swing arm (11) is an aluminum alloy extruded profile prepared by extrusion.

7. The front subframe structure according to claim 1, characterized by The first front subframe longitudinal beam (5) and the second front subframe longitudinal beam (6) are both square tube structures and are internally provided with reinforcing ribs, and are both aluminum alloy extruded profiles prepared by extrusion.

8. The front subframe structure according to claim 1, characterized by The first front subframe longitudinal beam (5) and the second front subframe longitudinal beam (6) are both square tube structures and are internally provided with reinforcing ribs, and are both aluminum alloy extruded profiles prepared by extrusion.

9. A chassis characterized by, The first front subframe longitudinal beam (5) and the second front subframe longitudinal beam (6) are both square tube structures and are internally provided with reinforcing ribs, and are both aluminum alloy extruded profiles prepared by extrusion.

10. A vehicle characterized by comprising: The chassis comprises the front subframe structure according to any one of claims 1-8. The vehicle comprises the chassis according to claim 9.

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