Aluminum alloy suspension swing arm with topologically optimized lattice structure

Abstract

The application discloses an aluminum alloy suspension swing arm with a topologically optimized hollow structure and relates to the technical field of automobile suspension systems.The swing arm body is made of aluminum alloy material and has an inverted L-shaped vertical section.A lightweight plate is formed in the middle of the swing arm body, and a lightweight hollow area is formed in the lightweight plate.A hollow unit is arranged in the lightweight hollow area, and the hollow unit is formed by polygonal splicing.A rigid plate is arranged at the positions of the two ends of the L-shaped swing arm body and the connecting point position.The thickness of the lightweight plate is smaller than that of the rigid plate.A self-cleaning assembly is arranged on the lightweight plate of the swing arm body and is used for guiding sand and stones to separate from the swing arm body.The thickness difference between the lightweight hollow area and the rigid plate guarantees the strength of the mounting point, and the self-cleaning assembly is used for actively discharging sundries, so that wear and corrosion caused by sand and stone accumulation are avoided.

Description

Technical Field

[0001] This invention relates to the field of automotive suspension system technology, and specifically to an aluminum alloy suspension arm with a topology-optimized hollow structure. Background Technology

[0002] With the increasing demands for lightweight automotive components, aluminum alloy suspension arms have gradually replaced traditional steel control arms. To ensure sufficient strength and stiffness while reducing weight, topology optimization technology has been introduced into control arm design. Through finite element analysis, material distribution is optimized under given design space and load conditions, resulting in a lightweight structure composed of irregular meshes, trusses, or honeycomb-shaped hollow units. Simultaneously, to meet the local load-bearing requirements at the ends and corner connection points of the control arm, existing designs typically include thicker, rigid reinforcement areas near the ball joint and bushing mounting points, while maintaining a thinner, lightweight hollow structure in the middle.

[0003] However, in actual use, the aforementioned aluminum alloy suspension arms with topology-optimized hollow structures present challenges. Because the lightweight hollow area in the center of the arm is composed of multiple polygonal hollow units, these units create numerous open cavities or through holes. During vehicle operation, debris such as sand, mud, and de-icing salt from the road surface easily splashes and embeds itself in the gaps or corners of these hollow units. Due to the irregular geometry of the hollow units and the limited cleaning space, conventional high-pressure water guns or air guns are insufficient to completely remove the deeply embedded fine, hard particles and corrosive salt. The remaining debris continues to wear down the control arm surface during subsequent vehicle vibrations, damaging the protective layer and triggering electrochemical corrosion in humid environments. This leads to a decrease in the fatigue life of the control arm and a risk of premature breakage. Summary of the Invention

[0004] The purpose of this invention is to provide an aluminum alloy suspension swing arm with a topology-optimized hollow structure, in order to solve the problem that in the prior art, aluminum alloy suspension swing arms with topology-optimized hollow structures are prone to embedding and accumulating sand, mud, snow melting salt and other debris in the hollow units, which are difficult to completely remove, resulting in fretting wear and electrochemical corrosion on the surface of the swing arm, affecting fatigue life and safety of use.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an aluminum alloy suspension swing arm with a topology-optimized hollow structure, comprising a swing arm body made of aluminum alloy material, the vertical cross section of which is an inverted L shape;

[0006] A lightweight plate is formed in the middle of the swing arm body, and a lightweight hollow area is formed inside the lightweight plate;

[0007] A hollow unit is disposed within the lightweight hollow area, and the hollow unit is composed of polygonal splicing.

[0008] Rigid plates are located near both ends and the connection points of the L-shaped structure of the swing arm body;

[0009] The thickness of the lightweight plate is less than the thickness of the rigid plate;

[0010] An anti-accumulation self-cleaning component is installed on a lightweight plate of the swing arm body to guide sand and gravel away from the swing arm body.

[0011] Furthermore, a lower control arm ball joint mounting part connected to the wheel steering knuckle is installed at the bottom of the L-shaped vertical section of the control arm body, a control arm rear bushing mounting part is connected to the end of the L-shaped transverse section of the control arm body, a control arm front bushing mounting part is installed at the L-shaped connection point of the control arm body, and the rigid plates are respectively disposed near the lower control arm ball joint mounting part, the control arm front bushing mounting part, and the control arm rear bushing mounting part.

[0012] Furthermore, the swing arm body is integrally formed by low-pressure casting or 3D printing of aluminum alloy, and the outside of the swing arm body is provided with load-bearing reinforcing ribs. The two ends of the load-bearing reinforcing ribs are respectively fixedly connected to the middle of the horizontal section and the vertical section of the swing arm body.

[0013] Furthermore, the cross-section of the hollow unit is hexagonal, the interior of each hollow unit is hollowed out, and the hollow units are spliced ​​together, with their sides fixedly connected to the sidewall of the lightweight hollow area.

[0014] Furthermore, the anti-accumulation self-cleaning component consists of a sand discharge hole, a guide groove, and an inclined guide portion. The sand discharge hole is located near both ends of the lightweight plate and faces the rear or lower part of the vehicle. The inclined guide portion is formed on both sides of the sand discharge hole. The vertical cross-section of the inclined guide portion is wedge-shaped and the thickness gradually decreases towards the sand discharge hole. The guide groove is located on the rigid plate. One end of the guide groove is connected to the inclined guide portion, and the other end extends outward through the swing arm body.

[0015] Furthermore, the vertical cross-section of the guide channel is V-shaped, and its bottom extends along the length or width direction of the swing arm body.

[0016] Furthermore, the lightweight plate is also provided with anti-embedding protrusions, which are hemispherical in shape and distributed in a ring around the inclined guide portion.

[0017] Furthermore, the surface of the swing arm body is covered with a layer of micro-arc oxide ceramic.

[0018] Furthermore, a Teflon-based self-lubricating coating is applied over the micro-arc oxidation ceramic layer, and at least on the inner walls of the flow channel, sand discharge hole, and hollow unit.

[0019] Furthermore, the total hollowing rate of the lightweight hollowed-out area accounts for 35%-55% of the overall volume of the swing arm body.

[0020] Compared with existing technologies, this invention provides an aluminum alloy suspension control arm with a topology-optimized hollow structure. By setting a thin, lightweight plate in the middle of the control arm body, and forming a lightweight hollow area composed of polygonal hollow units within it, while thicker rigid plates are set at both ends and connection points of the L-shaped control arm, the local strength of the mounting and connection areas is maintained while ensuring overall lightweight design. Furthermore, an anti-accumulation self-cleaning component is set on the lightweight plate. This component guides sand, mud, and other debris entering the hollow area to actively detach from the control arm body, effectively preventing long-term accumulation of debris inside the hollow units. Vibrations and bumps during vehicle operation, or water flow during routine washing, can all promote the discharge of debris along a predetermined path, reducing the fretting wear of residual hard particles on the control arm surface, and also reducing the residence time of corrosive salts and moisture in the hollow gaps. Combined with the micro-arc oxidation ceramic layer and Teflon-based self-lubricating coating on the surface of the control arm body, the adhesion of debris is further reduced and the corrosion resistance of the substrate is improved. This helps to alleviate the electrochemical corrosion problem caused by the accumulation of debris, extend the fatigue life of the suspension control arm, and improve the reliability and maintenance convenience of the vehicle chassis system. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0022] Figure 1 This is a schematic diagram of the overall structure of an aluminum alloy suspension swing arm with a topology-optimized hollow structure provided in an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the swing arm body and load-bearing reinforcing ribs and other components provided in an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the lightweight plate and sand discharge holes provided in an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the structure of the swing arm body and the micro-arc oxidation ceramic layer, etc., provided in an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the structure of the swing arm body and Teflon-based self-lubricating coating and other components provided in an embodiment of the present invention.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Swing arm body; 2. Lightweight plate; 3. Hollowed-out unit; 4. Rigid plate; 5. Lower swing arm ball joint mounting part; 6. Control arm rear bushing mounting part; 7. Control arm front bushing mounting part; 8. Bearing reinforcing rib; 9. Sand discharge hole; 10. Guide groove; 11. Inclined guide part; 12. Anti-embedding protrusion; 13. Micro-arc oxidation ceramic layer; 14. Teflon-based self-lubricating coating; 15. Lightweight hollowed-out area. Detailed Implementation

[0029] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0030] As attached Figure 1 To be continued Figure 5 As shown:

[0031] Example 1:

[0032] This invention provides an aluminum alloy suspension swing arm with a topology-optimized hollow structure, comprising a swing arm body 1, which is integrally formed from aluminum alloy material using a low-pressure casting process. The preferred aluminum alloy material is A356 aluminum alloy, with the following chemical composition: silicon 6.5%-7.5%, magnesium 0.25%-0.45%, titanium 0.08%-0.20%, iron less than 0.20%, and the remainder being aluminum and unavoidable impurities. After T6 heat treatment (solution treatment plus artificial aging), the material achieves a tensile strength of over 310 MPa, a yield strength of over 230 MPa, and an elongation of over 5%, meeting the mechanical performance requirements of the suspension swing arm. Alternatively, 6061 aluminum alloy or 6082 aluminum alloy can be used, or additive manufacturing can be performed using AlSi10Mg aluminum alloy powder via 3D printing technology.

[0033] The vertical cross-section of the control arm body 1 is an inverted L-shape, meaning that when viewed from the side of the vehicle, the control arm body 1 presents a bent structure with an approximate 90-degree angle. The portion extending roughly longitudinally along the vehicle is called the vertical segment, and the portion extending roughly laterally is called the lateral segment. The vertical and lateral segments meet and connect at the end near the wheel, forming a smoothly transitioned corner area. This L-shaped configuration is a typical shape for the lower control arm of a MacPherson strut suspension, capable of simultaneously withstanding longitudinal forces (such as those generated by braking and acceleration) and lateral forces (such as those generated during cornering).

[0034] A lightweight plate 2 is formed in the central region of the swing arm body 1. This lightweight plate 2 is not a separate part, but rather a functional section located in the middle of the swing arm body 1. Geometrically, the lightweight plate 2 extends rearward from the side near the ball joint mounting part to the side near the bushing mounting part, covering the main force transmission path area of ​​the swing arm body 1. A lightweight hollow area 15 is formed inside the lightweight plate 2. This lightweight hollow area 15 is a spatial mesh structure designed using a topology optimization algorithm and directly formed during casting or 3D printing.

[0035] Specifically, the lightweight hollow area 15 contains multiple hollow units 3, each composed of polygons. In this embodiment, the hollow unit 3 has a regular hexagonal cross-section, with each hexagon having a side length of 8mm to 15mm and an edge thickness of 2mm to 4mm. The interior of each hollow unit 3 is completely hollow, meaning the area enclosed by the hexagon is a hollow structure without any filling material. The hollow units 3 are interconnected to form a honeycomb-like or honeycomb-like periodic grid structure, with their sides fixedly connected to the sidewalls of the lightweight hollow area 15. Adjacent hollow units 3 share a common edge. This hexagonal honeycomb structure has high specific stiffness and specific strength, maintaining excellent compressive and shear resistance while removing a large amount of material.

[0036] The total hollowing ratio of the lightweight hollowed-out area 15 accounts for 35%-55% of the overall volume of the swing arm body 1. In this embodiment, after finite element optimization calculation, the total hollowing ratio is controlled at 42%±3%. The hollowing ratio refers to the percentage obtained by dividing the sum of the cavity volumes of all hollowed-out units within the lightweight hollowed-out area 15 by the volume of the outer envelope entity occupied by the lightweight hollowed-out area 15. Exceeding 55% will lead to insufficient overall stiffness of the swing arm, while being below 35% will result in an insignificant weight reduction effect, failing to demonstrate the advantages of topology optimization.

[0037] Rigid plates 4 are respectively provided at the L-shaped ends and connection points of the swing arm body 1. Rigid plates 4 refer to solid areas that are thick, dense, and have no hollowing or have a significantly lower degree of hollowing than the lightweight plates 2.

[0038] Specifically, the thickness of the lightweight plate 2 is less than that of the rigid plate 4. Numerically, the base thickness of the lightweight plate 2 (i.e., the thickness of the edges of the hollow unit) is 2mm-4mm, while the solid thickness of the rigid plate 4 is 8mm-15mm, a difference of 2 to 5 times. This thickness difference is achieved by setting different cavity thicknesses in the casting mold or by setting different scanning paths during the 3D printing process.

[0039] From a positional perspective, the bottom of the L-shaped vertical section (i.e., the vertical segment) of the swing arm body 1 is fitted with a lower swing arm ball joint mounting part 5 that connects to the wheel steering knuckle. This lower swing arm ball joint mounting part 5 is a boss structure with a tapered through-hole that is larger at the top and smaller at the bottom. The taper of the tapered hole is 1:6 to 1:10, used to press in the tapered shank of the ball joint pin, and is locked with a nut. The end of the L-shaped transverse section of the swing arm body 1 is connected to a control arm rear bushing mounting part 6. This control arm rear bushing mounting part 6 is a cylindrical base with an inner diameter of 20mm to 30mm, used to press in a rubber bushing. The inner hole of the bushing is connected to the subframe via bolts. The control arm front bushing mounting part 7 is installed at the L-shaped connection point (i.e., the corner area) of the swing arm body 1. The front bushing mounting part 7 is also a cylindrical base, but its axial direction is at a certain angle (usually 60 degrees to 90 degrees) to the axial direction of the rear bushing mounting part 6, so as to adapt to the mounting point position on the subframe.

[0040] The rigid plates 4 are respectively disposed near the lower control arm ball joint mounting portion 5, the control arm rear bushing mounting portion 6, and the control arm front bushing mounting portion 7. That is, each mounting base is surrounded by a rigid plate 4, forming a high-strength localized reinforcement area. For example, a ring-shaped or triangular rigid plate 4 is provided around the lower control arm ball joint mounting portion 5. This rigid plate 4 extends outward from the root of the ball joint mounting portion 5 by 20mm to 30mm, with its thickness gradually transitioning from 12mm to 8mm, and then to 2mm-4mm for the lightweight plate 2. This gradual transition avoids abrupt changes in thickness, thereby eliminating stress concentration.

[0041] The swing arm body 1 is also provided with a load-bearing reinforcing rib 8 on its exterior. This load-bearing reinforcing rib 8 is a long, rectangular or trapezoidal protrusion with a height of 5mm to 10mm and a width of 6mm to 12mm. Both ends of the load-bearing reinforcing rib 8 are fixedly connected to the middle of the transverse and vertical sections of the swing arm body 1, respectively. Specifically, one end is connected to the rigid plate 4 near the front bushing mounting part 7 of the control arm, and the other end is connected to the rigid plate 4 near the rear bushing mounting part 6 of the control arm. The load-bearing reinforcing rib 8 extends along the inner or outer side of the L-shaped bend of the swing arm body 1, acting similarly to an arch bridge or cable-stayed bridge, distributing the load from the wheel from the ball joint mounting part 5 to the two bushing mounting parts, while simultaneously improving the bending stiffness of the swing arm under vertical impact.

[0042] Example 2 (Example of Anti-fouling Self-cleaning Component):

[0043] This embodiment further describes the anti-accumulation self-cleaning component in detail, based on Embodiment 1.

[0044] The anti-accumulation self-cleaning component is mounted on the lightweight plate 2 of the swing arm body 1 and is used to guide sand and gravel away from the swing arm body 1. This component does not rely on any electronic sensors or active control devices and achieves its self-cleaning function entirely through a purely mechanical structure, which has the advantages of simple structure, high reliability, and maintenance-free operation.

[0045] The anti-accumulation self-cleaning component consists of three parts: a sand discharge hole 9, a flow guide groove 10, and an inclined guide part 11. These are described in detail below:

[0046] The sand vent 9 is located near both ends of the lightweight plate 2, specifically near one end of the lower control arm ball joint mounting portion 5 and one end of the control arm rear bushing mounting portion 6. The shape of the sand vent 9 can be circular, elliptical, or oblong, with a diameter or major axis dimension of 8mm to 15mm. The opening direction of the sand vent 9 is carefully designed so that it faces the rear or lower part of the vehicle.

[0047] Specifically, the sand discharge holes 9 located at the front of the lightweight plate 2 mainly face downwards and rearwards, while the sand discharge holes 9 located at the rear of the lightweight plate 2 mainly face directly downwards. This orientation design utilizes the combined effect of the oncoming airflow generated when the vehicle is moving and gravity: when the vehicle is moving forward, air enters the hollow unit 3 from the front and then carries debris out through the sand discharge holes 9 at the rear; at the same time, when the vehicle is stationary or moving at low speed, the debris falls naturally under the action of gravity and falls out of the downward-facing sand discharge holes 9.

[0048] The inclined guide portion 11 is formed on both sides of the sand discharge hole 9. The vertical cross-section of the inclined guide portion 11 is wedge-shaped, that is, it gradually decreases from a higher starting point towards the sand discharge hole 9, and the angle between its inclined surface and the horizontal plane is 15 degrees to 30 degrees. The thickness of the inclined guide portion 11 gradually decreases towards the sand discharge hole 9. That is, at a position away from the sand discharge hole 9, the solid thickness of the inclined guide portion 11 is larger (about 4mm-6mm), while near the edge of the sand discharge hole 9, the thickness gradually decreases to 0.5mm-1mm, and finally smoothly connects with the hole wall of the sand discharge hole 9. This wedge-shaped structure forms a slope from high to low. When sand or mud falls into the hollow unit 3 and lands on this slope, it will automatically slide down under the action of gravity and eventually fall into the sand discharge hole 9.

[0049] The guide groove 10 is formed on the rigid plate 4. However, it should be noted that the "rigid plate 4" here refers to a local rigid area near the location of the sand discharge hole 9. The guide groove 10 is not an additional part independent of the rigid plate 4, but a groove formed by a downward indentation on the surface of the rigid plate 4. One end of the guide groove 10 communicates with the inclined guide part 11, that is, it aligns with the side wall of the sand discharge hole 9 or the lowest point of the inclined guide part 11. The other end extends outward through the outer side wall of the swing arm body 1, forming an open outlet.

[0050] The guide channel 10 has a V-shaped vertical cross-section with an included angle of 60 to 90 degrees and a depth of 3 to 6 mm. Its bottom extends along the length or width of the swing arm body 1. The advantage of the V-shaped cross-section is that when fluid (water carrying sediment) flows through, the V-shaped channel concentrates the fluid to the deepest part of the bottom, increasing the flow velocity and creating a "scouring" effect, preventing sediment from settling at the bottom. Simultaneously, the sloping sides of the V-shaped channel also guide debris towards the center. The length of the guide channel 10 is set according to actual layout requirements, generally ranging from 30 mm to 80 mm.

[0051] In addition, the lightweight plate 2 is also provided with anti-embedding protrusions 12. The anti-embedding protrusions 12 are hemispherical in shape, with a spherical radius of 1.5mm to 2.5mm and a protrusion height of 1.5mm to 2.5mm. Multiple anti-embedding protrusions 12 are distributed in a ring around the inclined guide portion 11. Specifically, 4 to 6 anti-embedding protrusions 12 are evenly arranged circumferentially at the opening edge of each hollow unit 3. The function of these hemispherical protrusions is that when a large-diameter gravel (e.g., a gravel with a diameter larger than the opening size of the hollow unit 3) attempts to enter the hollow unit 3, the anti-embedding protrusions 12 will first contact the gravel. Due to their smooth hemispherical curved surface, the gravel will be bounced away or change direction and slide down, instead of directly getting stuck between the edges of the hollow unit 3. At the same time, the presence of the anti-embedding protrusions 12 also increases the surface area of ​​the opening edge of the hollow unit 3, making it easier for mud and water to flow under the action of surface tension rather than accumulate.

[0052] The working process of this embodiment is as follows: When the vehicle is driving on a muddy or gravel road, mud, gravel, and de-icing salt splashed up by the wheels will splash onto the surface of the swing arm. Some of the debris will fall into the hollow unit 3 of the lightweight hollow area 15. After falling in, the debris first lands on the wedge-shaped inclined surface of the inclined guide 11. Under the vibration, bumps, and gravity of the vehicle, the debris slides down the inclined surface to the sand discharge hole 9. If the debris is wet mud, it will form flowing mud and water, which will further flow into the guide channel 10, flow quickly along the V-shaped guide channel 10 to the outside of the swing arm body 1 and be discharged from the outlet. If the vehicle is moving, the oncoming airflow will also enter through the opening of the hollow unit 3, blowing out the remaining fine dust from the sand discharge hole 9. Even if a small amount of debris is not discharged immediately, it will continue to move and eventually be discharged under the inertial force generated by the subsequent braking, acceleration, or turning of the vehicle. When the vehicle is being routinely maintained, the maintenance personnel use a high-pressure water gun to rinse it from above the swing arm. The water flow will follow the path of the inclined guide 11 and the guide channel 10 to wash away the debris, without leaving any residue in the corners of the hollow unit.

[0053] Example 3 (Surface Protective Layer Example):

[0054] This embodiment, based on Embodiment 1 or Embodiment 2, further describes the surface protection treatment of the swing arm body 1. The surface of the swing arm body 1 is covered with a micro-arc oxidation ceramic layer 13. The specific preparation method is as follows: the swing arm body 1, which has undergone casting and heat treatment, is used as the anode, and micro-arc oxidation treatment is performed in a special electrolyte to generate a micro-arc oxidation ceramic layer 13 with a thickness of 30μm to 50μm. This ceramic layer has high hardness (up to HV800 or higher), high wear resistance, and good electrical insulation, which can effectively resist the impact and friction of sand and gravel, while blocking the galvanic corrosion current between the aluminum alloy substrate and external corrosive media and dissimilar metals (such as steel bolts and ball head pin housings).

[0055] A Teflon-based self-lubricating coating 14 is also coated on the micro-arc oxidation ceramic layer 13, and at least on the inner walls of the guide channel 10, sand discharge hole 9, and hollow unit 3. This coating can be applied by spraying or dipping, with a thickness controlled between 10 μm and 15 μm. Teflon material has extremely low surface energy, making it difficult for mud, water, oil, and other contaminants to adhere; even if a small amount remains, it is easily washed away with a high-pressure water gun. Simultaneously, this self-lubricating coating further reduces the coefficient of friction between sand and gravel and the swing arm surface, reducing fretting wear.

[0056] Through the composite protection of the micro-arc oxidation ceramic layer 13 and the Teflon-based self-lubricating coating 14, the corrosion resistance and anti-adhesion ability of the control arm body 1 are further improved, forming a synergistic effect with the anti-accumulation self-cleaning component, effectively extending the service life of the suspension control arm under harsh working conditions.

[0057] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An aluminum alloy suspension swing arm with a topology-optimized hollow structure, characterized in that, include: The swing arm body (1) is made of aluminum alloy and its vertical cross section is an inverted L shape; A lightweight plate (2) is formed in the middle of the swing arm body (1), and a lightweight hollow area (15) is formed inside the lightweight plate (2). A hollow unit (3) is disposed within the lightweight hollow area (15), and the hollow unit (3) is composed of polygons spliced ​​together; Rigid plate (4) is located at the L-shaped position near both ends and the connection point of the swing arm body (1); The thickness of the lightweight plate (2) is less than the thickness of the rigid plate (4); An anti-accumulation self-cleaning component is disposed on the lightweight plate (2) of the swing arm body (1) and is used to guide sand and gravel away from the swing arm body (1).

2. The aluminum alloy suspension swing arm with a topology-optimized hollow structure according to claim 1, characterized in that, The bottom of the L-shaped vertical section of the swing arm body (1) is equipped with a lower swing arm ball joint mounting part (5) that is connected to the wheel steering knuckle. The end of the L-shaped horizontal section of the swing arm body (1) is connected with a control arm rear bushing mounting part (6). The L-shaped connection point of the swing arm body (1) is equipped with a control arm front bushing mounting part (7). The rigid plate (4) is respectively located near the lower swing arm ball joint mounting part (5), the control arm front bushing mounting part (7) and the control arm rear bushing mounting part (6).

3. The aluminum alloy suspension swing arm with a topology-optimized hollow structure according to claim 1, characterized in that, The swing arm body (1) is integrally formed by low-pressure casting or 3D printing of aluminum alloy. The swing arm body (1) is provided with load-bearing reinforcing ribs (8) on the outside. The two ends of the load-bearing reinforcing ribs (8) are respectively fixedly connected to the middle of the horizontal section and the vertical section of the swing arm body (1).

4. An aluminum alloy suspension swing arm with a topology-optimized hollow structure according to claim 1, characterized in that, The cross-section of the hollow unit (3) is hexagonal, and the interior of each hollow unit (3) is hollowed out. The hollow units (3) are spliced ​​together and their sides are fixedly connected to the side wall of the lightweight hollow area (15).

5. An aluminum alloy suspension swing arm with a topology-optimized hollow structure according to claim 1, characterized in that, The anti-accumulation self-cleaning component consists of a sand discharge hole (9), a guide groove (10), and an inclined guide part (11). The sand discharge hole (9) is opened on the lightweight plate (2) near both ends and facing the rear or lower part of the vehicle. The inclined guide part (11) is formed on both sides of the sand discharge hole (9). The vertical cross section of the inclined guide part (11) is wedge-shaped and the thickness gradually decreases towards the sand discharge hole (9). The guide groove (10) is opened on the rigid plate (4). One end of the guide groove (10) is connected to the inclined guide part (11), and the other end extends outward through the swing arm body (1).

6. An aluminum alloy suspension swing arm with a topology-optimized hollow structure according to claim 5, characterized in that, The vertical cross-section of the guide channel (10) is V-shaped, and its bottom extends along the length or width direction of the swing arm body (1).

7. An aluminum alloy suspension swing arm with a topology-optimized hollow structure according to claim 5, characterized in that, The lightweight plate (2) is also provided with anti-embedding protrusions (12), which are hemispherical in shape and are distributed in a ring around the inclined guide (11).

8. An aluminum alloy suspension swing arm with a topology-optimized hollow structure according to claim 1, characterized in that, The surface of the swing arm body (1) is covered with a layer of micro-arc oxide ceramic (13).

9. An aluminum alloy suspension swing arm with a topology-optimized hollow structure according to claim 8, characterized in that, On the micro-arc oxidation ceramic layer (13), and at least on the inner wall of the guide groove (10), sand discharge hole (9) and hollow unit (3), a Teflon-based self-lubricating coating (14) is also applied.

10. An aluminum alloy suspension swing arm with a topology-optimized hollow structure according to claim 1, characterized in that, The total hollowing rate of the lightweight hollow area (15) accounts for 35%-55% of the overall volume of the swing arm body (1).

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