Aluminum alloy lower swing arm and manufacturing method thereof

Abstract

The invention relates to the field of automobile suspensions, and discloses an aluminum alloy lower swing arm which is of an aluminum profile extrusion integrated forming structure and is characterized in that outer eave parts extending towards the two sides are arranged on the upper surface of a main body profile; a first bushing hole for connecting a steering knuckle is formed in one end of the main body profile in the length direction to form a first connecting section, and a second bushing hole for connecting a frame is formed in the other end of the main body profile to form a second connecting section; the first connecting section is further provided with a third connecting hole used for being connected with a shock absorber. The main body profile is gradually narrowed towards the first connecting section along the length direction and forms a clamp-shaped structure on the section; the main body profile is gradually narrowed towards the second connecting section in the length direction, a U-shaped structure is formed on the section, and meanwhile, a lifting bent part is upwards formed in the gradual narrowing process of the U-shaped structure. By means of the structure, the requirement for light weight of automobiles in the future can be effectively met, the weight of parts is greatly reduced, and the requirement for strength durability is met.

Description

Technical Field

[0001] The invention relates to the field of automobile suspension, in particular to an aluminum alloy lower swing arm and a manufacturing method thereof. Background Art

[0002] The lower arm of the automobile chassis suspension is a connecting piece used to form a connection between the frame or subframe and the wheel. Usually, the lower arm is provided with three connecting ends, two of which are connected to the frame or subframe, and the other connecting end is connected to the steering knuckle via a ball pin. When the car turns, the steering knuckle and the wheel rotate around the ball pin connecting end of the lower arm. The lower arm connects the steering knuckle and the subframe to control the suspension bounce, and performs parameter positioning and load transfer during the movement. The commonly used lower arm structure is basically a stamping and welding structure of traditional materials. This process is mature and simple to manufacture, but the traditional material itself is heavy. When used as a material for a car, it will affect shock absorption and fuel consumption, and welding will cause a loss of strength, stability and durability.

[0003] Aluminum alloy profiles are a common equipment manufacturing material and are widely used in automotive parts. Aluminum alloy materials are highly lightweight, and the density of aluminum alloy is much lower than that of steel, but the strength is relatively high; this allows automotive parts made of aluminum alloy to significantly reduce the curb weight of the vehicle, thereby improving fuel efficiency or extending the range of electric vehicles. Aluminum alloys have good corrosion resistance and have good corrosion resistance in natural environments. They can effectively resist the erosion of environmental factors such as oxidation and moisture, and extend the service life of automotive parts. Aluminum alloys are easy to process in a variety of ways, such as casting, forging, extrusion, and cutting, and can be made into parts with complex shapes and high precision, meeting the strict requirements for part shape and precision in automobile manufacturing. Aluminum alloy materials also have good shock absorption and thermal conductivity, have high damping capacity, can effectively absorb and disperse vibrations, and improve ride comfort. At the same time, its good thermal conductivity helps to dissipate heat in hot parts such as engines, ensuring the safety and reliability of automobile operation. Aluminum alloy profiles are also recyclable and environmentally friendly; aluminum alloy itself is a recyclable material, and the energy consumption in the recycling process is much lower than extracting aluminum from primary ore. Although the initial cost of aluminum alloy may be higher than some traditional materials, it is generally more cost-effective considering its lightweight fuel efficiency, reduced maintenance costs and extended long-term service life. These advantages make the use of aluminum alloy meet the current automotive industry's requirements for environmental protection and sustainable development.

[0004] However, there are still many problems in the use of aluminum alloy materials in the manufacture of automobile lower control arms, such as strength and stiffness requirements, cost, wear resistance and durability, and safety and reliability considerations. As a key component of the automobile suspension system, the lower control arm needs to withstand various impact forces from the road, support the weight of the vehicle body and transmit driving force. In long-term use, it will become thinner, deformed, and cracked due to wear. In addition, the lower control arm connector may become loose, resulting in unstable vehicle driving; it is easy to rust and corrode in a humid environment, affecting its strength and stability. Faulty lower control arms may also cause abnormal noise, affecting the quietness of driving; especially when passing speed bumps or bumpy roads, the abnormal noise and increased clearance of the chassis are particularly obvious. More seriously, damage to the lower control arm may also cause positioning parameters to be inaccurate, causing the vehicle to deviate and aggravate the wear of other components, such as excessive wear of tires. The steering system may also be affected, and even fail. Therefore, the material selection and structural design of the lower control arm must have sufficient strength, stiffness, corrosion resistance and durability to cope with these complex working environments.

[0005] Aluminum alloy lower arms are relatively rare in the market, which may be related to market acceptance and technical maturity. On the one hand, consumers' awareness and acceptance of aluminum alloy lower arms may not be high enough; on the other hand, the manufacturing technology and process of aluminum alloy lower arms may need to be further improved and matured. These factors may limit the widespread application of aluminum alloy lower arms. Summary of the invention

[0006] In order to solve the above problems in the prior art, the purpose of the present invention is to provide an aluminum alloy lower swing arm and a manufacturing method thereof. This structure can effectively meet the requirements of lightweight electric vehicles, greatly reducing the weight of parts compared to traditional stamping and welding structures, and even compared with other aluminum alloy swing arms, this new process aluminum alloy lower swing arm also has a weight advantage.

[0007] In order to achieve the above purpose, the present invention adopts the following technical solution: An aluminum alloy lower swing arm, characterized in that it comprises: the aluminum alloy lower swing arm is an aluminum profile extrusion integrally formed structure, the upper surface of the main profile is provided with an outer eaves extending to both sides, and the upper surface is a plane; one end of the main profile along the length direction is provided with a first bushing hole for connecting to a steering knuckle to form a first connecting section, and the other end is provided with a second bushing hole for connecting to a vehicle frame to form a second connecting section; the first connecting section is also provided with a third connecting hole for connecting to a shock absorber; The main body profile gradually narrows toward the first connecting section along the length direction and forms a clamp-like structure in the cross section; the main body profile gradually narrows toward the second connecting section along the length direction and forms a U-shaped structure in the cross section, and the U-shaped structure gradually narrows to form a raised curved portion upward.

[0008] As a further improvement of the present invention, the main body profile is a rectangular tubular aluminum alloy profile.

[0009] As a further improvement of the present invention, a cushion installation hole is opened at the center of the upper surface of the main body profile.

[0010] As a further improvement of the present invention, the first bushing hole is located in a first hollow boss portion formed on the main body profile; the first hollow boss portion is protruded inwardly and arranged correspondingly on both side walls.

[0011] As a further improvement of the present invention, the third connection hole is located in a second hollow boss portion formed on the main body profile; the second hollow boss portion is correspondingly arranged to protrude inward on both side walls.

[0012] As a further improvement of the present invention, the bottom of the U-shaped structure of the second connecting section is extruded to form folds.

[0013] As a further improvement of the present invention, the lower parts of the side walls of the main body profile expand symmetrically outward; and two reinforcing protrusions are provided on the outer contour of the bottom of the main body profile along the length direction.

[0014] As a further improvement of the present invention, the upper notch of the clamp-like structure is larger than the lower notch.

[0015] As a further improvement of the present invention, the notch formed on the upper surface of the U-shaped structure is further enlarged at a certain distance inward at the end and then gathered at the raised curved portion.

[0016] A method for manufacturing an aluminum alloy lower swing arm in the present invention comprises the following steps: The upper part of the forged main body profile forms an outer eaves portion; Forging the sides of both ends of the main body profile to form a narrowed first connecting section and a second connecting section; Two hollow boss portions are respectively punched inwardly on both side walls of the first connecting section; On the first hollow boss portion and the second hollow boss portion, the main body profile is respectively drilled to form a first bushing hole and a third connecting hole; on the two side walls of the second connecting section, the main body profile is drilled to form a second bushing hole; and the central portion of the upper surface of the main body profile is drilled to form a cushion mounting hole; Cutting the ends of the first connecting section and the second connecting section respectively to form a clamp-shaped structure and a U-shaped structure; Using an expansion tool to perform expansion processing on the lower part of the side wall of the main profile; The main body profile is bent at the gradually narrowing portion of the second connecting section; and the bottom of the U-shaped structure of the second connecting section is squeezed.

[0017] Compared with the prior art, the present invention has the following advantages: The invention discloses an aluminum alloy lower swing arm, which is formed by extrusion of aluminum profiles and is a single piece without any redundant welding structure. The invention provides a first connecting section and a second connecting section for easy connection and installation, and the overall structure is in a closed shape, which effectively reduces the weight of components and improves the safety performance of the entire vehicle. The design of the outer eaves is used to increase the structural strength of the lower swing arm, and at the same time helps to prevent moisture, dust and other impurities from entering the interior, thereby improving the durability of the components. The clamp-like structure or the U-shaped structure enables the lower swing arm to more effectively disperse stress when subjected to road impact force, thereby improving the overall strength and rigidity. The clamp-like structure helps to increase the rigidity of the lower swing arm when turning, while the U-shaped structure can provide better torsion resistance. The design of gradually narrowing from the main profile to both ends not only helps to reduce the weight of the lower swing arm, but also optimizes its mechanical properties, thereby making it more stable when subjected to load.

[0018] Furthermore, the rectangular structure provides good stability and load-bearing capacity, while the lightweight characteristics of aluminum alloy help to reduce the overall weight of the lower arm; the use of rectangular tubular aluminum alloy profiles can reduce material and processing costs.

[0019] Furthermore, the cushion mounting hole enables the lower control arm to be firmly connected to the lower cushion, ensuring the overall stability and reliability of the suspension system; the cushion mounting hole allows accessories such as shock-absorbing cushions to be installed on the lower control arm, helping to improve the comfort and noise reduction performance of the suspension system.

[0020] Furthermore, the design of the hollow boss portion can optimize the stress distribution, make the stress distribution around the connecting hole more uniform, avoid the transfer of force on the profile, increase the strength and stability of the connecting hole, and also help to optimize the overall structure of the lower arm; the hollow boss portion is manufactured through a stamping process, which also improves the strength.

[0021] Furthermore, the pleat design is used to increase the strength and rigidity of the bottom of the U-shaped structure to prevent deformation or damage during long-term use; the pleat design also reduces the space of the second connecting section and reduces the space for water and oil accumulation; the pleat design helps to optimize the force distribution of the second bushing hole and increase the connection strength.

[0022] Furthermore, the lower part of the side wall expands symmetrically outward. This curved side wall structure can improve the bending resistance of the profile body along the length direction and enhance its stability under working conditions such as side winds or emergency lane changes.

[0023] Furthermore, the upper notch of the clamp-like structure is larger than the lower notch. This design leaves more space for the installation of the steering knuckle bushing and the ball pin, and also helps to optimize the mechanical properties of the lower control arm during steering, thereby improving the steering sensitivity and stability.

[0024] Furthermore, the notch formed on the upper surface of the U-shaped structure expands a certain distance inward at the end and then converges at the raised curved portion. This notch design is used to optimize the stress distribution of the lower control arm, reduce stress concentration under complex working conditions, and improve the durability of the component.

[0025] The present invention discloses a method for manufacturing an aluminum alloy lower swing arm, which includes basic lathe processing steps such as forging, stamping, turning, drilling, cutting, internal expansion processing and extrusion. These simple and basic steps help to improve the production efficiency and precision of the lower swing arm, and also help to optimize its mechanical properties and durability. Through precise manufacturing and processing processes, it can be ensured that the size and shape of the lower swing arm meet the design requirements, thereby improving its overall performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of an aluminum alloy lower arm from one perspective; Figure 2 is a schematic diagram of an aluminum alloy lower arm from another perspective; Figure 3 It is a front view schematic diagram of an aluminum alloy lower swing arm; Figure 4 It is a bottom view schematic diagram of an aluminum alloy lower swing arm; Among them, 1. the first bushing hole; 2. the third connecting hole; 3. the cushion mounting hole; 4. the second bushing hole; 5. the main body profile; 6. the outer eaves; 7. the first connecting section; 8. the second connecting section; 9. the clamp-like structure; 10. the U-shaped structure; 11. the raised bending part; 12. the first hollow boss part; 13. the second hollow boss part; 14. the fold; 15. the reinforcing protrusion. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0028] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0030] Example like Figure 1 As shown, the aluminum alloy lower arm includes: a main body profile 5, a first bushing hole 1 for connecting to the steering knuckle is opened at one end along the length direction to form a first connecting section 7; a second bushing hole 4 for connecting to the frame is opened at the other end to form a second connecting section 8; and a third connecting hole 2 for connecting to the shock absorber, and a cushion mounting hole 3 is formed at the center of the upper surface of the main body profile 5.

[0031] The main profile 5 is formed by extruding an aluminum profile, and the redundant materials and holes are realized by blanking process, so that the lower arm body is a single piece, which reduces the number of parts, reduces the weight of parts, and is easy to disassemble, install and replace. The first bushing hole 1 is connected to the knuckle bushing and fastened by bolts; the third connection hole 2 is connected to the lower end of the shock absorber and fastened by bolts; the spring lower cushion installation hole 3 is used to install the spring lower cushion, and the protrusion of the lower cushion is inserted into the installation hole 3; the second bushing hole 4 is connected to the subframe and fastened by bolts and bushings.

[0032] Among them, the aluminum alloy lower arm is a major component of the suspension system, located between the wheel and the subframe. The design principle of the aluminum alloy lower arm is mainly reflected in its structural characteristics and material selection. Its main profile is an aluminum profile extrusion one-piece molding structure, which ensures the strength and rigidity of the lower arm while achieving lightweight. Through specific shape design, such as clamp-like structure and U-shaped structure, as well as lifting the curved part, the aluminum alloy lower arm can effectively transmit the force and torque between the wheel and the body, while constraining the up and down movement direction of the wheel to ensure that the tire is as close to the ground as possible. The aluminum alloy lower arm is connected to the steering knuckle, frame and shock absorber by opening the first bushing hole, the second bushing hole and the third connection hole, thereby constructing a complete suspension system. This connection method not only ensures the stability and reliability of the suspension system, but also improves the handling performance and comfort of the vehicle.

[0033] The advantages are as follows: Aluminum alloy has a low density, so the weight of aluminum alloy lower arm is relatively light. This helps to reduce the overall weight of the vehicle and reduce the unsprung mass, thereby improving the vehicle's handling performance and fuel efficiency. Aluminum alloy performs well in strength and can meet the strength and rigidity requirements of the lower arm. This high-strength characteristic ensures the stability and reliability of the suspension system and improves the safety performance of the vehicle. Aluminum alloy has good corrosion resistance and is not easy to rust. This extends the service life of the lower arm and reduces maintenance costs. Aluminum alloy performs well in vibration absorption, which helps to reduce the vibration and noise of the vehicle during driving and improve ride comfort. Although the raw material price of aluminum alloy is relatively high, the use of aluminum profile extrusion one-piece molding technology can significantly reduce manufacturing costs and improve production efficiency.

[0034] In summary, aluminum alloy lower arm has been widely used in modern automobile suspension systems due to its advantages of light weight, high strength, good corrosion resistance and strong vibration absorption. This lower arm not only improves the vehicle's handling performance and comfort, but also extends its service life and reduces maintenance costs.

[0035] like Figure 1 As shown, the upper part of the main body profile 5 is provided with an outer eaves 6 extending to both sides, and the upper surface is flat; a cushion mounting hole 3 is opened in the center of the upper surface of the main body profile 5, and the spring lower cushion mounting hole 3 is used to install the spring lower cushion, and the protrusion of the lower cushion is inserted into the mounting hole 3, which is elastic and convenient for installation and adjustment.

[0036] like Figure 2 As shown, the main body profile 5 gradually narrows along the length direction toward the first bushing hole 1 to form a first connecting section 7 and a clamp-like structure 9 on the cross section; the main body profile 5 gradually narrows along the length direction toward the second connecting section 8 and forms a U-shaped structure 10 on the cross section, and at the same time, the U-shaped structure 10 gradually narrows and forms a raised curved portion 11 upward. The gradual narrowing is naturally formed by extrusion on both sides, without adding a complicated manufacturing process. The raised curved portion is also bent by a bending machine or a punching machine, without adding a complicated process.

[0037] The main body profile 5 is made of aluminum alloy and is integrally formed, which reduces the number of parts; the hollow material is selected to reduce the weight of the structure.

[0038] The clamp-like structure 9 or the U-shaped structure 10 enables the lower control arm to disperse stress more effectively when subjected to road impact force, thereby improving the overall strength and rigidity; the clamp-like structure 9 helps to increase the rigidity of the lower control arm during turning, while the U-shaped structure 10 can provide better torsional resistance; the design of gradually narrowing from the main profile to both ends not only helps to reduce the weight of the lower control arm, but also optimizes its mechanical properties, making it more stable when subjected to load.

[0039] The first bushing hole 1 is located in the first hollow boss portion 12 formed on the main profile 5; the first hollow boss portion 12 is correspondingly arranged on both side walls and protrudes inward. The third connecting hole 2 is located in the second hollow boss portion 13 formed on the main profile 5; the second hollow boss portion 13 is correspondingly arranged on both side walls and protrudes inward. The design of this hollow boss portion can optimize the stress distribution, make the stress distribution around the connecting hole more uniform, avoid the transfer of profile force, increase the strength and stability of the connecting hole, and also help to optimize the overall structure of the lower arm; the hollow boss portion is manufactured through a stamping process, which also improves the strength.

[0040] like Figure 3 As shown, the first bushing hole 1 is located in a first hollow boss portion 12 formed on the main body profile 5; the first hollow boss portions 12 are all protruded inwardly and arranged accordingly to facilitate the alignment and installation of the bushing.

[0041] Similarly, the third connection hole 2 is located in the second hollow boss portion 13 formed on the main body profile; the second hollow boss portions are all protruded inwardly and arranged accordingly to facilitate alignment and installation with the bolts of the shock absorber.

[0042] The bottom of the U-shaped structure of the second connecting section 8 is squeezed to form a fold 14, which helps to optimize the force distribution of the second bushing hole 4 and increase the connection strength.

[0043] like Figure 4 As shown, the lower part of the side wall of the main profile 5 is symmetrically expanded outward. During manufacturing, an internal expansion tool can be used, with a suitable size selected, inserted into the aluminum alloy profile, and operated according to the requirements of the internal expansion process until the desired hole diameter and shape are achieved to improve the quality and performance of the aluminum profile. Two reinforcement protrusions 15 are set on the outer contour along the length direction at the bottom of the main profile 5 to strengthen and support the structure.

[0044] The upper notch of the clamp-like structure 9 is larger than the lower notch; the notch can be completed by turning or cutting; this design leaves more space for the installation of the steering knuckle bushing and the ball pin, and also helps to optimize the mechanical characteristics of the lower swing arm during steering, and improve the steering sensitivity and stability. In addition, the notch design also further reduces its own weight.

[0045] The notch formed on the upper surface of the U-shaped structure expands a certain distance inward at the end and then converges at the raised curved portion. This unique notch design is used to optimize the stress distribution of the lower control arm, reduce stress concentration under complex working conditions, and improve the durability of the component; the weight of the notch cut off further reduces its own weight without reducing the strength.

[0046] A method for manufacturing an aluminum alloy lower swing arm in the present invention comprises: The upper part of the forged main body profile 5 forms an outer flange 6; Forging the sides of both ends of the main body profile 5 to form a narrowed first connecting section 7 and a second connecting section 8; Two hollow bosses 12 and 13 are respectively punched inwardly on both side walls of the first connecting section 7; On the first hollow boss portion 12 and the second hollow boss portion 13, the main body profile 5 is respectively drilled to form a first bushing hole 1 and a third connection hole 2; on the two side walls of the second connection section 8, the main body profile 5 is drilled to form a second bushing hole 4; and the center portion of the upper surface of the main body profile 5 is drilled to form a cushion mounting hole 3; Cut the ends of the first connecting section 7 and the second connecting section 8 respectively to form a clamp-shaped structure 9 and a U-shaped structure 10; Using an expansion tool to expand the lower part of the side wall of the main profile 5; The main body profile 5 is bent at the gradually narrowing portion of the second connecting section 8; the bottom of the U-shaped structure 20 of the second connecting section 8 is extruded to form a fold 14; and two reinforcing protrusions 15 are formed on the outer contour of the bottom of the extruded main body profile 5 along the length direction.

[0047] The present invention discloses a method for manufacturing an aluminum alloy lower swing arm, which includes lathe processing steps such as forging, stamping, turning, drilling, cutting, internal expansion processing and extrusion. These simple and basic steps can improve the production efficiency and precision of the lower swing arm without increasing the high manufacturing cost, and also help to optimize its mechanical properties and durability. Through precise manufacturing and processing processes, it can be ensured that the size and shape of the lower swing arm meet the design requirements, thereby improving its overall performance.

[0048] Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but rather with reference to the preceding claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to be a disclaimer of such subject matter, nor should it be considered that the applicants did not consider such subject matter to be part of the disclosed inventive subject matter.

[0049] The above content is a further detailed description of the present invention. It cannot be determined that the specific implementation methods of the present invention are limited to these. For ordinary technicians in the technical field to which the present invention belongs, without departing from the concept of the present invention, they can also make several simple deductions or substitutions, which should be regarded as belonging to the protection scope of the present invention determined by the submitted claims.

Claims

1. An aluminum alloy lower arm, characterized in that: The aluminum alloy lower swing arm is an aluminum profile extrusion integrally formed structure, comprising: a main body profile (5); The upper part of the main body profile (5) is provided with an outer flange part (6) extending to both sides, and the upper surface is a plane; The main body profile (5) has a first bushing hole (1) for connecting to a steering knuckle at one end along the length direction to form a first connecting section (7), and a second bushing hole (4) for connecting to a vehicle frame at the other end to form a second connecting section (8); the first connecting section (7) is also provided with a third connecting hole (2) for connecting to a shock absorber; The main body profile (5) gradually narrows along the length direction toward the first connecting section (7) and forms a clamp-like structure (9) on the cross section; The main body profile (5) gradually narrows along the length direction toward the second connecting section (8) and forms a U-shaped structure (10) in the cross section, and the U-shaped structure (10) gradually narrows to form a raised curved portion (11) upwards.

2. The aluminum alloy lower swing arm according to claim 1, characterized in that: The main profile (5) is a rectangular tubular aluminum alloy profile.

3. The aluminum alloy lower swing arm according to claim 1, characterized in that: A cushion mounting hole (3) is provided at the center of the upper surface of the main body profile (5).

4. The aluminum alloy lower swing arm according to claim 1, characterized in that: The first bushing hole (1) is located in a first hollow boss portion (12) formed on the main body profile (5); the first hollow boss portion (12) is arranged on both side walls to protrude inwards and correspond.

5. The aluminum alloy lower swing arm according to claim 1, characterized in that: The third connection hole (2) is located in a second hollow boss portion (13) formed on the main body profile (5); the second hollow boss portion (13) is arranged on both side walls to protrude inwards and correspond thereto.

6. The aluminum alloy lower swing arm according to claim 1, characterized in that: The bottom of the U-shaped structure (10) of the second connecting section (8) is squeezed to form a fold (14).

7. The aluminum alloy lower swing arm according to claim 1, characterized in that: The lower parts of the side walls of the main body profile (5) are symmetrically expanded outwards; and two reinforcing protrusions (15) are provided on the outer contour of the bottom of the main body profile (5) along the length direction.

8. The aluminum alloy lower swing arm according to claim 1, characterized in that: The upper notch of the clamp-like structure (9) is larger than the lower notch.

9. The aluminum alloy lower swing arm according to claim 1, characterized in that: The notch formed on the upper surface of the U-shaped structure (10) expands a certain distance inward at the end and then converges into the raised curved portion (11).

10. A method for manufacturing an aluminum alloy lower swing arm according to claims 1-9, comprising the following steps: The upper part of the forged main body profile (5) forms an outer flange part (6); Forging the side portions at both ends of the main body profile (5) to form a narrowed first connecting section (7) and a second connecting section (8); Two hollow boss portions are respectively punched inwardly on both side walls of the first connecting section (7); On the first hollow boss portion (12) and the second hollow boss portion (13), the main body profile (5) is respectively drilled to form a first bushing hole (1) and a third connection hole (2); on the two side walls of the main body profile (5) on the second connection section (8), a second bushing hole (4) is drilled; and a cushion mounting hole (3) is drilled at the center of the upper surface of the main body profile (5); Cutting the ends of the first connecting section (7) and the second connecting section (8) respectively to form a clamp-shaped structure (9) and a U-shaped structure (10); Using an expansion tool to perform an expansion process on the lower portion of the side wall of the main profile (5); The main body profile (5) is bent at the gradually narrowing portion of the second connecting section (8); and the bottom of the U-shaped structure (10) of the second connecting section (8) is squeezed to form a fold (14).

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