Spring arm and vehicle

Abstract

A spring arm (100) and a vehicle, the spring arm (100) can include two connecting arms (10) and a mounting plate (20). Wherein, the two connecting arms (10) are mirror image structures, and are oppositely arranged. The mounting plate (20) is connected to one side of the two connecting arms (10), and forms an "H" type with the two connecting arms (10); the middle position of the mounting plate (20) protrudes outward from each connecting arm (10), and gradually shrinks to the connecting arm (10) from the middle position to the two ends. The spring arm (100) has small occupied space, simple structure, light weight, and the connecting arms (10) are oppositely arranged, and the mounting plate (20) is arranged on one side of the two connecting arms (10), so that the space arrangement of the upper end surface of the spring arm is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a spring arm and a vehicle. BACKGROUND

[0002] The automobile market is highly competitive, and many users are no longer satisfied with the appearance of the automobile, and pay more attention to the performance of the automobile. A suspension with high handling stability is becoming a development trend. In order to improve the handling stability of the vehicle suspension, the rear suspension often adopts a five-link structure. However, the five-link structure has a high requirement for space arrangement. The spring arm, as one of the five links, needs to bear the force of the air spring and the shock absorber in the Z direction. In addition, the spring arm is connected to the sub-frame and the steering knuckle through bolts, and the Y direction also needs to bear the force transmission from the wheel to the end of the sub-frame. Therefore, the spring arm needs to be small in size, light in weight, and ensure the Y direction stiffness, Z direction stiffness and Y direction buckling.

[0003] The Z direction of the spring arm of the traditional five-link structure of the automobile enterprise mainly bears the force through the coil spring. However, the cross-sectional area of the coil spring is small. In order to meet the requirements of stiffness and strength, the spring arm structure is designed as a "bowl" shape. The "bowl" structure occupies a large space, the casting process is complex, and the lightweight requirement can only be met by replacing the material. In addition, the reduction of product weight by switching from high-strength steel to aluminum material cannot completely achieve the extreme lightweight of the product. SUMMARY

[0004] In view of the above problems, the present application is proposed to provide a spring arm and a vehicle which overcome the above problems or at least partially solve the above problems.

[0005] One object of the present application is to provide a spring arm which is small in size, compact in structure and light in weight.

[0006] A further object of the present application is to solve the problem of the heavy weight, low strength and stiffness of the spring arm in the prior art.

[0007] A further object of the present application is to solve the problem that the space, gravity, strength, stiffness and durability cannot be achieved simultaneously in the existing spring arm.

[0008] In particular, according to one aspect of an embodiment of the present application, a spring arm is provided, comprising:

[0009] two connecting arms, the two connecting arms are mirror image structures and are oppositely arranged; and

[0010] a mounting plate connected to one side of the two connecting arms and forming an "H" shape with the two connecting arms, the middle position of the mounting plate is protruded outward from each connecting arm, and gradually shrinks to the connecting arm from the middle position to both ends.

[0011] Optionally, the plane in which the plate surface of each connecting arm is located forms a first preset angle with the plane in which the plate surface of the mounting plate is located, and the height of each connecting arm at the position of the mounting plate is greater than the height of the two ends, wherein the first preset angle is substantially equal to 90°.

[0012] Optionally, one side of each connecting arm is further provided with a vertical rib, each vertical rib extends from the middle position of the mounting plate to one end of the connecting arm in which the vertical rib is located, and the two vertical ribs are oppositely arranged and located on the same side of the connecting arm as the mounting plate.

[0013] The straight line formed by the extending direction of the vertical rib forms a second preset angle with the plane in which the mounting plate is located, and the second preset angle is an obtuse angle.

[0014] Optionally, the mounting plate comprises a mounting surface located in the middle for mounting an air spring, the mounting surface comprises a through hole located in the middle and a continuous outer edge located on the outside, and a part of the outer edge is tangent to the connecting arm and a part of the outer edge is tangent to the vertical rib.

[0015] The through hole is used for mutually clamping and fixing the air spring with the air spring.

[0016] The outer edge of the mounting surface comprises two first circular arcs oppositely arranged and located on the inside of the mounting plate, and two second circular arcs oppositely arranged and tangent to the connecting arm.

[0017] Optionally, the center of the circle in which each first circular arc is located is located on the inside of the mounting surface, and the first circular arc close to the vertical rib is tangent to the vertical rib at two ends thereof.

[0018] The center of the circle in which each second circular arc is located is located on the outside of the mounting surface, and each second circular arc is tangent to the corresponding connecting arm at one end thereof.

[0019] Optionally, a first reinforcing rib is arranged between the two connecting arms, the first reinforcing rib is located on the same side of the mounting plate as the vertical rib, and the reinforcing rib and the two vertical ribs are mutually bridged.

[0020] Optionally, the first reinforcing rib is perpendicular to the straight line along which each connecting arm extends, and the two ends of the first reinforcing rib are in contact with the side surface of one of the vertical ribs, respectively.

[0021] Optionally, a second reinforcing rib is further arranged on the surface of the mounting plate opposite to the first reinforcing rib, the second reinforcing rib is located on the opposite sides of the through hole, and each second reinforcing rib is mutually bridged with the two connecting arms.

[0022] Optionally, the second reinforcing rib is parallel to the first reinforcing rib, and two ends of each second reinforcing rib are in contact with the side surfaces of two connecting arms, respectively.

[0023] Optionally, a grid structure is further arranged on the side surface of the mounting plate.

[0024] Optionally, at least one mounting hole is arranged on each connecting arm near the two ends, and the central axis of the mounting hole is parallel to the plane in which the mounting plate is located.

[0025] Optionally, the mounting hole on each connecting arm comprises a sub-frame mounting hole, a shock absorber mounting hole and a steering knuckle mounting hole.

[0026] Optionally, a plurality of bosses parallel to the plane in which the connecting arm is located are arranged on each connecting arm, and the bosses comprise reinforcing bosses, identification bosses or positioning bosses.

[0027] Optionally, the positioning bosses comprise first positioning bosses arranged on the connecting arms and second positioning bosses arranged on the mounting plate, and the two first positioning bosses and the second positioning boss form a triangle to improve the stability of the spring arm. In particular, another embodiment of the present application provides a vehicle comprising the spring arm described above.

[0028] The spring arm of the present application comprises a H-shaped structure composed of two connecting arms and a mounting plate, the mounting plate is used for mounting an air spring, and the connecting arms are connected with other components of the vehicle, such as a steering knuckle, a shock absorber and a sub-frame. Compared with the existing "bowl" structure, the spring arm of the present application occupies less space and has lighter weight. In addition, the connecting arms of the present application are arranged oppositely, and the mounting plate is arranged on one side of the two connecting arms, thereby reducing the space arrangement of the upper end surface of the spring arm. In addition, the spring arm of the present application is the force transmission path along the extension direction of the connecting arm, and the spring arm structure can effectively increase the stiffness in the direction of the force transmission path.

[0029] In addition, the connecting arms and the mounting plate of the present application are aluminum alloy cast and machined structures, which are compact in structure and occupy less space. The material lightweight is met, and the structure is extremely lightweight by utilizing the structural characteristics, the space utilization is improved, and the spring arm meets the performance requirements of stiffness, strength, buckling and the like in the development process.

[0030] Since the height of the connecting arm of the spring arm of the present application at the position of the mounting plate is greater than the height at the two end positions, the mounting plate is ensured to be located on one side of the height direction of the connecting arm, the space arrangement of the upper end surface of the spring arm and the air spring is reduced, and the Z-direction stiffness of the spring arm is effectively improved.

[0031] The spring arm of the present application is provided with a stud, the structure of which increases the Z-direction stiffness and Y-direction bending strength of the spring arm, and reduces the space structure of the upper end surface of the spring arm, so that the Z-direction stiffness and Y-direction bending strength are satisfied by using the least space.

[0032] The above description is only a summary of the technical solutions of the present application. In order to enable one skilled in the art to better understand the technical means of the present application and implement it according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described below.

[0033] The above and other purposes, advantages and characteristics of the present application will be more apparent to those skilled in the art from the following detailed description of specific embodiments of the present application in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0034] Some specific embodiments of the present application will be described in detail below with reference to the accompanying drawings, which are exemplary and not limiting. The same reference numerals in the drawings denote the same or similar components or parts. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0035] Figure 1 is a schematic perspective view of a spring arm according to an embodiment of the present application;

[0036] Figure 2 is a schematic perspective view of a spring arm according to an embodiment of the present application from another angle;

[0037] Figure 3 is a schematic front view of a spring arm according to an embodiment of the present application;

[0038] Figure 4 is a sectional view after being cut along the cutting line A-A; Figure 3

[0039] Figure 5 is a schematic bottom view of a spring arm according to an embodiment of the present application;

[0040] Figure 6 is a schematic rear view of a spring arm according to an embodiment of the present application;

[0041] Figure 7 is a schematic perspective view of a spring arm connected with an air spring according to an embodiment of the present application;

[0042] Figure 8 is a schematic rear view of a spring arm connected with an air spring according to an embodiment of the present application;

[0043] Figure 9 is a schematic perspective view of a spring arm connected with an air spring according to an embodiment of the present application; Figure 8 ​a sectional view taken along the section line B-B;

[0044] Figure 10 is Figure 8 a sectional view taken along the section line C-C;

[0045] Figure 11 is Figure 10 a partial enlarged view of the D portion in FIG. 10. DETAILED DESCRIPTION

[0046] Exemplary embodiments of the present disclosure will be described in greater detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure can be thoroughly understood, and the scope of the present disclosure can be accurately conveyed to those skilled in the art.

[0047] As a specific embodiment of the present application, Figure 1 is a schematic perspective view of a spring arm according to a specific embodiment of the present application. is a schematic perspective view of another angle of a spring arm according to an embodiment of the present application.

[0048] As Figures 1-2 shown, the present embodiment provides a spring arm 100, and specifically the spring arm 100 can include two connecting arms 10 and a mounting plate 20. The two connecting arms 10 are mirror image structures and are oppositely arranged. The mounting plate 20 is connected to one side of the two connecting arms 10 and forms an "H" shape with the two connecting arms 10. The middle position of the mounting plate 20 protrudes outwardly from each connecting arm 10, and gradually shrinks to the connecting arm 10 from the middle position to both ends. In the present embodiment, the "middle position" refers to a non-end position of the connecting arm 10, and does not refer to the center position of the connecting arm. In the present embodiment, the portion protruding from the connecting arm 10 is located near the center position of the connecting arm 10, and can be at the center position or slightly offset from the center position.

[0049] The spring arm 100 in the present embodiment forms an H-shaped structure with the two connecting arms 10 and the mounting plate 20. The mounting plate 20 is used to mount an air spring, and the connecting arms 10 are connected to other components of the vehicle, such as a knuckle, a shock absorber, and a subframe. Compared with the existing "bowl" structure, the spring arm 100 of the present embodiment occupies less space and is more lightweight. In addition, the connecting arms 10 in the present embodiment are oppositely arranged, and the mounting plate 20 is arranged on one side of the two connecting arms 10, which reduces the space arrangement on the upper end surface of the spring arm 100. In addition, the spring arm 100 in the present embodiment is the force transmission path along the extension direction of the connecting arm 10, and the spring arm of the present embodiment can effectively increase the stiffness in the direction of the force transmission path.

[0050] In addition, the connecting arm 10 and the mounting plate 20 of the present application are aluminum alloy official casting and mechanical processing structures, compact structure, small space occupation, meet the material lightweight, while using the structure characteristics to realize the structure extreme lightweight, improve the space utilization, and the spring arm 100 meets the stiffness, strength, buckling and other performance requirements in the development process.

[0051] Figure 3 is a schematic front view of a spring arm according to an embodiment of the present application; Figure 4 is Figure 3 is a sectional view after cutting along the cutting line A-A.

[0052] As a specific embodiment of the present application, the plane of the plate surface of each connecting arm 10 and the plane of the plate surface of the mounting plate 20 are at a first preset angle, wherein the first preset angle is substantially equal to 90°. Specifically, the first preset angle is Figure 4 the angle α in the figure. In a preferred embodiment, the first preset angle α is 90°. In other embodiments, the first preset angle α can be within the range of 90°±10°.

[0053] In addition, the height of each connecting arm 10 at the position of the mounting plate 20 is greater than the height at both ends. The height of the side surface of the connecting arm 10 at the position of the mounting plate 20 is greater than the height at both ends, which not only ensures that the mounting plate 20 is located on one side of the height direction of the connecting arm 10, but also reduces the spatial arrangement of the spring arm 100 and the upper end surface of the air spring, while effectively improving the Z-direction stiffness of the spring arm 100. Wherein, the Z-direction and Y-direction in the present embodiment are as identified by the coordinate axes in Figure 2 .

[0054] As a specific embodiment of the present application, as shown in Figures 1-3 , the present embodiment is further provided with a vertical rib 30 at one side of each connecting arm 10, the vertical rib 30 extends from the middle position of the mounting plate 20 to one end of the connecting arm 10, and each vertical rib 30 is located at the opposite side of the mounting plate 20 corresponding to the connecting arm 10. One end of the vertical rib 30 of the present embodiment gradually tapers inward from the middle of the mounting plate 20 to the connecting arm 10. Specifically, the start and end positions of the vertical rib 30 are as indicated by "L" in Figure 3 and Figure 5 . Specifically, the vertical rib 30 extends substantially from the widest position of the middle of the mounting plate 20 to one end position of the connecting arm 10.

[0055] Figure 5 is a schematic bottom view of a spring arm according to an embodiment of the present application; Figure 6is a schematic back view of the spring arm according to an embodiment of the present application. Specifically, the straight line formed by the extending direction of the stand 30 and the plane on which the mounting plate 20 is located forms a second preset angle, which is an obtuse angle. Specifically, the second preset angle is Figure 5 angle β in the formula, and the second preset angle β can be 170-180°. The shape of forming an obtuse angle between the stand and the mounting plate improves the Z-directional rigidity of the spring arm 100 and solves the problem of stress concentration in fatigue durability analysis, so that the spring arm 100 meets the fatigue life requirements of various working conditions and design cycles, and has a smaller occupied space and lighter weight compared with other spring arms.

[0056] Specifically, as can be seen from the bottom view of the spring arm 100, the stand 30 forms an integral whole with the connecting arm 10, and the size of the stand in the vertical direction from the middle to one end of the mounting plate 20 gradually increases, and the height in the Z-direction gradually increases, but the slope gradually becomes flatter.

[0057] In the embodiment, the stand 30 is arranged at the spring arm 100, which not only reduces the structure of the space on the upper end surface of the spring arm, but also increases the Z-directional rigidity and Y-directional flexural strength of the spring arm 100. In other words, the spring arm 100 of the embodiment meets the Z-directional rigidity and Y-directional flexural strength of the entire spring arm with the smallest space arrangement and the lightest weight.

[0058] As shown in Figures 7-11 are related views of the connection of the spring arm and the air spring. As shown in Figures 7-11 , as a specific embodiment, the mounting plate 20 of the embodiment can include a mounting surface 21 located in the middle, which is used to mount the air spring 200. The mounting surface 21 can include a through hole 211 located in the middle and a continuous outer edge 212 located on the outside (as shown in Figure 2 ), and the outer edge 212 is tangent to the connecting arm 10 at one part and tangent to the stand 30 at another part. The through hole 211 is used to be clamped with the air spring 200 to fix the air spring 200. Specifically, a clamping boss 215 is arranged at the through hole 211, and the air spring 200 is clamped at the clamping boss 215 by a buckle 201. As shown in Figure 9 .

[0059] Specifically, the outer edge 212 of the mounting surface 21 includes two oppositely arranged first circular arcs 213 and two oppositely arranged second circular arcs 214 tangent to the connecting arm 10. When the air spring 200 is mounted on the mounting surface 21, the outer edge of the end portion of the air spring 200 in contact with the mounting surface 21 (i.e. Figure 7The outer edge of the bottom surface of the hollow air spring is matched with the first circular arc 213. The center of the circle where each first circular arc 213 is located is inside the mounting surface 21, and the first circular arc 213 on the left side (i.e. the side close to the stud 30) is tangent to both of the two studs 30 at both ends. The center of the circle where each second circular arc 214 is located is outside the mounting surface 21, and one of the second circular arcs 214 is tangent to one of the corresponding connecting arms 10 at one end, and the other second circular arc 214 is tangent to the other connecting arm 10 at one end.

[0060] In the embodiment, by forming the outer edge 212 of the mounting surface 21 into an irregular circle, it is ensured that the air spring 200 can be smoothly mounted at the mounting surface 21, the strength of the mounting surface 21 is ensured, the arrangement area and space are reduced, and the lightweight of the spring arm 100 is realized.

[0061] In addition, in the embodiment, since the center of the second circular arc 214 is outside the mounting plate 20, the mounting contact area of the air spring 200 is reduced, and the stress points are mainly concentrated on the two sides of the mounting surface 21 of the air spring 200 and the spring arm 100. Since the first circular arc 213 is tangent to the stud 30, and the second circular arc 214 is tangent to the connecting arm 10, the strength of the mounting surface 21 in the Z direction is greatly improved, thereby meeting the stress requirement after the air spring 200 is connected with the spring arm 100.

[0062] In one embodiment of the present application, a first reinforcing rib 22 (as shown in Figure 2 and Figure 3 ) is arranged between the two connecting arms 10 on one surface of the mounting plate 20. The first reinforcing rib 22 is located on the same side of the mounting plate 20 as the stud 30, and the first reinforcing rib 22 and the two studs 30 are bridged with each other.

[0063] Preferably, the first reinforcing rib 22 is perpendicular to the straight line extended by each stud 20, and the two ends of the first reinforcing rib 22 are in contact with the side surface of one of the two studs 20, respectively. In the embodiment, the first reinforcing rib 22 and the two studs 30 are partially in contact, and the height of the first reinforcing rib 22 in the Z direction is lower than the height of the two studs 30 in the Z direction. When the air spring 200 is arranged at the mounting plate 20 and a force in the Z direction is applied to the mounting plate 20, the two studs 20 plus the first reinforcing rib 22 can increase the Z-direction stiffness of the entire spring arm 100.

[0064] In the embodiment, the first reinforcing rib 22 and the two studs 30 are bridged with each other, so that the entire structure occupies the minimum space while increasing the Z-direction stiffness of the spring arm 100. Compared with the traditional "bowl" structure, the same Z-direction stiffness can be achieved while the weight is reduced by about 20%.

[0065] In another embodiment of the present application, a second reinforcing rib 23 (as shown in Figs. Figure 1 、 6 and 8) is also provided on the other side surface of the mounting plate 20 opposite to the first reinforcing rib 22. The number of the second reinforcing rib 23 is two, and each of the second reinforcing ribs 23 is bridged with two connecting arms 10.

[0066] As a preferred embodiment, the second reinforcing rib 23 is parallel to the first reinforcing rib 22, and the two ends of each of the second reinforcing ribs 23 are in contact with the side surfaces of the two connecting arms 10, respectively.

[0067] Specifically, the height (Z direction) of the second reinforcing rib 23 is lower than the height of the connecting arm 10. In this embodiment, the second reinforcing rib 23 improves the bending strength of the spring arm 100 in the Y direction and increases the rigidity of the spring arm 100 in the Z direction.

[0068] In one embodiment, a grid structure 24 (as shown in Figs. Figure 6 and Figure 8 ) is also provided on the side surface of the mounting plate 20. The area and shape of the grid structure 24 can be designed freely according to the needs. In this embodiment, the grid structure 24 is designed on the same side surface of the mounting plate 20 as the second reinforcing rib 23, and is located outside the second reinforcing rib 23. The grid structure 24 is mainly used to improve the surface quality of the casting in the casting process.

[0069] In one embodiment, at least one mounting hole (as shown in Figs. Figure 1 、 2 , 5) is provided on each of the connecting arms 10 near the two ends, and the central axis of the mounting hole is parallel to the plane where the mounting plate 20 is located.

[0070] As a specific embodiment, the mounting hole on each of the connecting arms 10 includes a sub-frame mounting hole 11, a shock absorber mounting hole 12, and a steering knuckle mounting hole 13.

[0071] Specifically, with the direction of Figure 1 as the reference, the sub-frame mounting hole 11 is provided on the left side of the connecting arm 10 and is located near the left side end surface, which is used when the spring arm 100 is mounted with the sub-frame. The steering knuckle mounting hole 13 is provided on the right side of the connecting arm 10 and is located near the right side end of the connecting arm 10, which is used when the spring arm 100 is connected with the steering knuckle. The shock absorber mounting hole 12 is provided on the left side of the steering knuckle mounting hole 13 and is still located on the right side of the connecting arm 10. The shock absorber mounting hole 12 is used when the shock absorber is connected with the spring arm 100.

[0072] As a specific embodiment, each connecting arm 10 is provided with a plurality of bosses parallel to the plane in which the connecting arm 10 is located (as shown in Figure 6 and Figure 8 The bosses include reinforcing bosses 14, identification bosses 15 or positioning bosses.

[0073] Specifically, the reinforcing bosses 14 in the embodiment optimize the spring arm 100 casting demolding process, and also increase the strength of the connecting arm 10, especially the Z-direction strength. The identification bosses 15 are designed to realize the product platform generalization of the spring arm 100. Since the connecting arm 10 in the embodiment is a mirror image structure, the identification bosses 15 in the embodiment are used to distinguish the final positions of the cast connecting arms 10. The connecting arms 10 with the same identification boss are arranged on the same side, and the connecting arms 10 with another same identification boss are arranged on the other side. Of course, in the actual production process, the mirror image parts can be distinguished by retaining only the identification boss on one side of the connecting arm 10 during the post-production machining. In addition, the identification bosses 15 in the embodiment not only have the identification function, but also strengthen the connecting arm 10.

[0074] As a specific embodiment, the positioning bosses include a first positioning boss 161 arranged at the connecting arm 10 and a second positioning boss 162 arranged at the mounting plate 20. Each connecting arm 10 is provided with a first positioning boss 161, and the mounting plate 20 is provided with a second positioning boss 162. The two first positioning bosses 161 and the second positioning boss 162 form a triangle to improve the stability of the spring arm 100. Specifically, the positioning bosses are used for main positioning and auxiliary positioning of the spring arm 100 during machining, but the triangular arrangement pattern makes the spring arm 100 more stable during machining.

[0075] Based on the same technical concept, the embodiment of the present application also provides a vehicle. The vehicle can include the spring arm 100 above. Compared with the existing vehicle with a "bowl"-shaped spring arm structure, the vehicle can also be designed to be more portable due to the small space occupied by the spring arm 100 and the light weight. In addition, the connecting arms 10 of the spring arm 100 of the vehicle in the embodiment are oppositely arranged, and the mounting plate 20 is arranged on one side of the two connecting arms 10, reducing the space arrangement of the spring arm 100 and the upper end surface of the air spring.

[0076] In addition, the connecting arm 10 and the mounting plate 20 in the spring arm 100 of the vehicle of the present application are aluminum alloy cast and machined structures, which are compact in structure and small in space occupation, meet the material lightweight, utilize the structural characteristics to realize the extreme lightweight of the structure, improve the space utilization, meet the performance requirements of stiffness, strength, buckling and the like in the development process of the spring arm 100, and improve the stiffness and strength of the vehicle while meeting the performance of the vehicle.

[0077] At this point, those skilled in the art will recognize that, while the exemplary embodiments of the present application have been shown and described in detail, the present application can be implemented in many other ways that do not depart from the spirit and scope of the present application. Thus, the scope of the present application should be construed and determined by all such other variations or modifications that can be made in accordance with the disclosure of the present application and that conform to the principles of the present application.

Claims

1. A spring arm, comprising: Two connecting arms, the two connecting arms are mirror images of each other and are arranged opposite each other; and A mounting plate is attached to one side of each of the two connecting arms, forming an "H" shape with the two connecting arms; the middle portion of the mounting plate protrudes outward from each connecting arm, and gradually tapers towards both ends of the connecting arm; wherein, The plane containing the plate surface of each connecting arm forms a first preset angle with the plane containing the plate surface of the mounting plate. The height of each connecting arm at the position on the mounting plate is greater than the height at both ends, wherein the first preset angle is substantially equal to 90°. Each of the connecting arms is provided with a vertical rib on one side. Each vertical rib extends from the middle of the mounting plate to one end of the connecting arm where the vertical rib is located. The two vertical ribs are arranged opposite each other and are located on the same side of the connecting arm as the mounting plate. The straight line formed by the extension direction of the vertical rib forms a second preset angle with the plane where the mounting plate is located, and the second preset angle is an obtuse angle; wherein... The mounting plate includes a mounting surface located in the middle for mounting an air spring. The mounting surface includes a through hole located in the middle and a continuous outer edge located on the outside. A portion of the outer edge is tangent to the connecting arm and a portion is tangent to the vertical rib. The through hole is used to engage with and fix the air spring. The outer edge of the mounting surface includes two opposing first arc segments located inside the mounting plate and two opposing second arc segments tangent to the connecting arm.

2. The spring arm according to claim 1, wherein, The center of each of the first arcs is located inside the mounting surface, and the first arcs near the vertical rib are tangent to the vertical rib at both ends. The center of the circle containing each second arc is located outside the mounting surface, and each second arc is tangent to the corresponding connecting arm at one end.

3. The spring arm according to claim 1, wherein, A first reinforcing rib is provided between the two connecting arms. The first reinforcing rib and the vertical rib are located on the same side of the mounting plate, and the reinforcing rib and the two vertical ribs are connected to each other.

4. The spring arm according to claim 3, wherein, The first reinforcing rib is perpendicular to the straight line extending from each of the connecting arms, and the two ends of the first reinforcing rib respectively contact the side of one of the vertical ribs.

5. The spring arm according to claim 3 or 4, wherein, A second reinforcing rib is also provided on the surface of the mounting plate opposite to the first reinforcing rib. The second reinforcing rib is located on opposite sides of the through hole, and each of the second reinforcing ribs is bridged to the two connecting arms.

6. The spring arm according to claim 5, wherein, The second reinforcing rib is parallel to the first reinforcing rib, and the two ends of each second reinforcing rib respectively contact the sides of the two connecting arms.

7. The spring arm according to claim 1, wherein, A grid structure is also provided on one side surface of the mounting plate.

8. The spring arm according to claim 1, wherein, Each of the connecting arms has at least one through mounting hole near both ends, and the central axis of the mounting hole is parallel to the plane of the mounting plate.

9. The spring arm according to claim 8, wherein, Each of the mounting holes on the connecting arm includes a subframe mounting hole, a shock absorber mounting hole, and a steering knuckle mounting hole.

10. The spring arm according to claim 1, wherein, Each of the connecting arms is provided with a plurality of bosses whose axes are parallel to the plane in which the connecting arm is located, wherein the bosses include reinforcing bosses, marking bosses or positioning bosses.

11. The spring arm according to claim 10, wherein, The positioning boss includes a first positioning boss disposed at each of the connecting arms and a second positioning boss disposed at the mounting plate. The two first positioning bosses and the second positioning boss form a triangle to improve the stability of the spring arm.

12. A vehicle comprising the spring arm according to any one of claims 1-11.

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