Trailing arm

Abstract

The utility model discloses a trailing arm, and belongs to the technical field of automobiles. The automobile trailing arm overcomes the defects that in the prior art, an automobile trailing arm is low in strength, low in bending resistance and torsional rigidity and overweight. The trailing arm mainly comprises a trailing arm body, the trailing arm body comprises a front thin wall part, a rear thin wall part and a thickening part, the thickening part comprises an edge thickening part and a middle thickening part, the middle thickening part is arranged in the edge thickening part, the two ends of the middle thickening part are connected with the edge thickening part respectively, and the front thin wall part and the rear thin wall part are both arranged in the edge thickening part. The middle thickening part is arranged between the front thin-wall part and the rear thin-wall part, the peripheral edge of the front thin-wall part is connected with the side thickening part and the middle thickening part, the peripheral edge of the rear thin-wall part is connected with the side thickening part and the middle thickening part, and the thickness of the side thickening parts is larger than that of the front thin-wall part and that of the rear thin-wall part. The thickness of the middle thickened part is larger than that of the front thin-wall part and that of the rear thin-wall part.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobiles, and in particular relates to a trailing arm. Background Art

[0002] Trailing arms are mainly used in automobile suspensions to connect the body and the steering knuckle. They can provide high longitudinal stiffness. On the one hand, they control the movement of the suspension and keep the tire positioning parameters within a reasonable range, which is related to handling stability and safety. On the other hand, they bear the load from the steering knuckle, which is related to the load-bearing performance and safety of the entire vehicle.

[0003] In the suspension assembly of traditional automobiles, the trailing arm is a sheet metal stamping structure, which has weak strength and low bending and torsional rigidity. Some trailing arms also have welded structures. The welded structure of the trailing arm has the problem of stress concentration, which reduces the strength and service life of the trailing arm. When the suspension load is large, it cannot meet the strength requirements, affecting the vehicle's load-bearing performance and safety. Moreover, the current material of the trailing arm is generally steel, which has the problem of being too heavy.

[0004] For example, the patent with patent publication number CN212353508U proposes a suspension assembly, a trailing arm assembly and a vehicle for a vehicle, wherein the method of adding additional reinforcements to the trailing arm body is used to strengthen the strength and bending and torsional rigidity of the structure, but the connection part at one end of the additional reinforcement requires fasteners, and the additional reinforcements and fasteners invisibly increase the number of parts and the workload of assembly. The patent with patent publication number CN105946486B proposes a trailing arm, which includes a trailing arm body. By setting a reinforcement plate structure at the side bend of the trailing arm body, the problem of the trailing arm being easy to crack or break under a large load is effectively avoided, and the anti-buckling ability of the trailing arm is improved. However, the connection between the reinforcement plate and the trailing arm body has a welding structure, which has stress concentration and cannot fully meet the requirements of a larger load. Summary of the invention

[0005] The utility model aims to provide a trailing arm to overcome the defects of the prior art automobile trailing arm, such as weak strength, low bending and torsional rigidity, and excessive weight.

[0006] The utility model is realized by adopting the following technical solutions. A trailing arm includes a trailing arm body. The trailing arm body includes a front thin-wall part, a rear thin-wall part and a thickening part. The thickening part includes a side thickening part and a middle thickening part. The middle thickening part is inside the side thickening part, and both ends of the middle thickening part are respectively connected with the side thickening part. Both the front thin-wall part and the rear thin-wall part are inside the side thickening part, and the middle thickening part is between the front thin-wall part and the rear thin-wall part. The four peripheral edges of the front thin-wall part are connected with the side thickening part and the middle thickening part. The four peripheral edges of the rear thin-wall part are connected with the side thickening part and the middle thickening part. The thickness of the side thickening part is respectively greater than the thickness of the front thin-wall part and the rear thin-wall part. The thickness of the middle thickening part is respectively greater than the thickness of the front thin-wall part and the rear thin-wall part. A vehicle body connection hole is opened at the front end of the side thickening part, and a steering knuckle connection hole is opened at the rear end of the side thickening part.

[0007] Further, the trailing arm body is integrally cast.

[0008] Further, the trailing arm body is made of an aluminum-magnesium alloy material.

[0009] Further, steering knuckle connection holes are respectively opened on both sides at the rear end of the side thickening part, and mounting surfaces are respectively arranged on the upper and lower sides of the side thickening part at the steering knuckle connection holes.

[0010] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0011] 1. By setting the side thickening part and the middle thickening part as the strengthening structures of the trailing arm body, and the trailing arm body is integrally cast, the utility model has a high load-bearing capacity, can meet the requirements of strength, bending resistance and torsion resistance, improves the service life of the vehicle, and ensures the reliability and safety of the vehicle.

[0012] 2. By making the trailing arm body made of an aluminum-magnesium alloy material, and arranging the front thin-wall part and the rear thin-wall part at the middle position of the trailing arm body, the weight of the utility model is reduced, the purpose of high-load lightweight is achieved, and further the unsprung mass of the suspension is reduced, improving the vehicle comfort.

[0013] 3. By making the trailing arm body integrally cast, the number of parts is reduced, the structure is more compact, the molding is flexible and suitable for mass production, and the problem of stress concentration caused by the welding structure on the current trailing arm can be effectively avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a perspective view of the utility model in the top view direction;

[0015] Figure 2 is a perspective view of the utility model in the bottom view direction.

[0016] In the figure: 1. Trailing arm body; 2. Body connection hole; 3. Knuckle connection hole; 4. Front thin-walled part; 5. Rear thin-walled part; 6. Thickened part; 7. Edge thickened part; 8. Middle thickened part; 9. Mounting surface. Detailed implementation mode

[0017] In order to enable those skilled in the art of this technology to better understand the technical solutions in the present utility model, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0018] A trailing arm includes a trailing arm body 1. The trailing arm body 1 is integrally cast. Integral casting can reduce the number of components, make the structure more compact, be flexible in forming and suitable for mass production, and can effectively avoid the problem of stress concentration caused by the welding structure on the current trailing arm. The trailing arm body 1 is made of aluminum-magnesium alloy material, which reduces the weight of the present utility model, thereby reducing the unsprung mass of the suspension and improving the comfort of the vehicle.

[0019] The trailing arm body 1 includes a front thin-walled part 4, a rear thin-walled part 5 and a thickened part 6. The thickened part 6 includes an edge thickened part 7 and a middle thickened part 8. The middle thickened part 8 is inside the edge thickened part 7, and both ends of the middle thickened part 8 are respectively connected to the edge thickened part 7. The front thin-walled part 4 and the rear thin-walled part 5 are both inside the edge thickened part 7, and the middle thickened part 8 is between the front thin-walled part 4 and the rear thin-walled part 5. The front thin-walled part 4 is surrounded by the edge thickened part 7 and the middle thickened part 8, and the four peripheries of the front thin-walled part 4 are connected to the edge thickened part 7 and the middle thickened part 8. The rear thin-walled part 5 is surrounded by the edge thickened part 7 and the middle thickened part 8, and the four peripheries of the rear thin-walled part 5 are connected to the edge thickened part 7 and the middle thickened part 8. The thickness of the edge thickened part 7 is respectively greater than the thickness of the front thin-walled part 4 and the rear thin-walled part 5, and the thickness of the middle thickened part 8 is respectively greater than the thickness of the front thin-walled part 4 and the rear thin-walled part 5.

[0020] A body connection hole 2 is opened at the front end of the edge thickened part 7, and a knuckle connection hole 3 is opened at the rear end of the edge thickened part 7, that is, a body connection hole 2 is opened at the front end of the trailing arm body 1, and a knuckle connection hole 3 is opened at the rear end of the trailing arm body 1. The knuckle connection holes 3 are respectively opened on both sides at the rear end of the edge thickened part 7, and mounting surfaces 9 are respectively provided on the upper and lower sides of the edge thickened part 7 at the knuckle connection holes 3.

Claims

1. A trailing arm, characterized in that, It includes a trailing arm body (1), and the trailing arm body (1) includes a front thin-wall part (4), a rear thin-wall part (5) and a thickening part (6). The thickening part (6) includes a side thickening part (7) and a middle thickening part (8). The middle thickening part (8) is inside the side thickening part (7), and both ends of the middle thickening part (8) are respectively connected to the side thickening part (7). Both the front thin-wall part (4) and the rear thin-wall part (5) are inside the side thickening part (7), and the middle thickening part (8) is between the front thin-wall part (4) and the rear thin-wall part (5). The four peripheral edges of the front thin-wall part (4) are connected to the side thickening part (7) and the middle thickening part (8), and the four peripheral edges of the rear thin-wall part (5) are connected to the side thickening part (7) and the middle thickening part (8). The thickness of the side thickening part (7) is respectively greater than the thickness of the front thin-wall part (4) and the thickness of the rear thin-wall part (5), and the thickness of the middle thickening part (8) is respectively greater than the thickness of the front thin-wall part (4) and the thickness of the rear thin-wall part (5); a vehicle body connection hole (2) is opened at the front end of the side thickening part (7), and a knuckle connection hole (3) is opened at the rear end of the side thickening part (7).

2. A trailing arm according to claim 1, characterized in that, The trailing arm body (1) is integrally cast and formed.

3. A trailing arm according to claim 1, characterized in that, The trailing arm body (1) is made of an aluminum-magnesium alloy material.

4. A trailing arm according to claim 1, characterized in that, Knuckle connection holes (3) are respectively opened on both sides at the rear end of the side thickening part (7), and mounting surfaces (9) are respectively arranged on the upper and lower sides of the side thickening part (7) at the knuckle connection holes (3).

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