A rear axle sleeve and rear axle trailing arm connection structure and vehicle

Abstract

This invention discloses a rear axle sleeve and a rear axle trailing arm connection structure and a vehicle. The rear axle sleeve is provided with a boss, and the rear axle sleeve and the rear axle trailing arm are fixedly connected. By adopting the rear axle sleeve and rear axle trailing arm connection structure of this invention, cracking or separation of the weld between the rear axle sleeve and the rear axle trailing arm can be avoided, thereby improving the safety performance of the rear axle assembly.

Description

Technical Field

[0001] This invention belongs to the field of automotive chassis technology. Specifically, this invention relates to a connection structure between a rear axle sleeve and a rear axle trailing arm. Background Technology

[0002] In the field of automotive chassis technology, the rear axle assembly belongs to the rear suspension system of the automotive chassis and is a crucial component affecting vehicle handling, NVH (noise, vibration, and harshness), and safety. Due to its advantages such as simple structure, few parts, low cost, small footprint, and easy maintenance, the rear axle suspension is widely used by most automakers in small cars, compact cars, and MPVs.

[0003] The rear axle sleeve is a crucial component of the rear axle assembly, typically connected to the rear axle trailing arm via welding. As a key load-bearing component in the rear axle assembly, the rear axle sleeve must withstand significant impact loads and high-frequency dynamic loads. Because the rear axle sleeve is connected to the rear axle trailing arm via welding, the weld strength and fatigue performance requirements for the connection between the rear axle sleeve and the trailing arm are very high. However, the welding standards of different rear axle assembly manufacturers vary considerably, and some manufacturers lack sufficient welding quality control capabilities. This leads to poor welding at the connection between the rear axle sleeve and the trailing arm in some rear axle assemblies. Under significant loads or continuous alternating loads, the weld between the rear axle sleeve and the trailing arm cracks, causing the rear axle sleeve to separate and detach from the trailing arm, resulting in the detachment of the rear suspension module from the vehicle chassis and potentially causing safety accidents.

[0004] Utility model patent CN203358211U, published on December 25, 2013, discloses a rear axle for automobiles with a torsion beam. It includes a trailing arm arranged along the vehicle's forward direction, with its rear end connected to a wheel. A bushing sleeve is provided at the front end of the trailing arm, and the trailing arm is connected to the vehicle body via a rubber bushing housed within the bushing sleeve. The bushing sleeve has an opening groove along its axial direction, and fixed supports are provided on both sides of the opening groove, with the two fixed supports fastened together by bolts and nuts. However, this rear axle for automobiles also fails to solve the aforementioned technical problem. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of the prior art by providing a rear axle sleeve and rear axle trailing arm connection structure and vehicle that prevents the weld between the rear axle sleeve and the rear axle trailing arm from cracking or separating and falling off, thereby improving the safety performance of the rear axle assembly.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] The rear axle sleeve and rear axle trailing arm connection structure has a boss on the rear axle sleeve and the rear axle trailing arm are fixedly connected.

[0008] The rear axle trailing arm has an inner cavity at its end, the boss extends into the inner cavity, and the boss and the rear axle trailing arm are connected by bolts and nuts.

[0009] The boss is provided with a mounting platform, the mounting platform has a mounting through hole in the middle, the rear axle sleeve has a mounting hole at the end, the bolt passes through the mounting hole and the mounting through hole, and the bolt and nut are provided in pairs.

[0010] The rear axle sleeve has welding mating surfaces on both sides of the boss, and the rear axle longitudinal arm has a welding mating edge at its end. The welding mating surfaces are in contact with the welding mating edges, and a connecting weld is provided between the welding mating surfaces and the welding mating edges. The boss is located between the connecting welds.

[0011] The rear axle trailing arm is provided with a drain hole, which is located between the ends of the welded mating edges.

[0012] The connecting weld extends to the leakage hole and extends outward by 5-10 mm.

[0013] The boss is square in shape, and the ends of the boss are rounded.

[0014] The rear axle sleeve is circular, and the welded mating edge is arc-shaped.

[0015] A closed crossbeam is fixedly connected between the rear axle trailing arms, and a spring seat is connected between the rear axle trailing arms and the closed crossbeam. A shock absorber bracket, a wheel hub mounting bracket, a wheel hub mounting plate, and a wiring harness bracket are provided at the bottom of the rear axle trailing arms.

[0016] The vehicle includes a rear axle sleeve and a rear axle trailing arm connection structure.

[0017] The technical effects of this invention are as follows: By adopting the rear axle sleeve and rear axle trailing arm connection structure of this invention, a boss is provided on the rear axle sleeve, which changes the connection method between the rear axle sleeve and the rear axle trailing arm, provides additional bolt connection, and the boss extends into the inner cavity to maintain the shape and spacing of the weld, ensuring the stability of the weld matching. The bolt connection and welding work together to improve the stress performance of the rear axle sleeve, meet the load-bearing requirements, and avoid the problem of cracking, separation and detachment of the weld of the poorly welded rear axle sleeve and rear axle trailing arm when subjected to large loads or continuous alternating loads, which would cause the rear suspension module of the automobile chassis to fall off.

[0018] The rear axle sleeve and rear axle trailing arm connection structure allows the rear axle sleeve and rear axle trailing arm to be formed separately during production. During assembly, it simplifies the assembly steps of the rear axle sleeve and rear axle trailing arm, improves work efficiency, and the setting of the boss does not occupy space or affect the original structure of the rear axle assembly, thus having the advantage of small space occupation. Attached Figure Description

[0019] This manual includes the following figures, which illustrate the following:

[0020] Figure 1 This is a schematic diagram of the rear axle assembly of the present invention;

[0021] Figure 2 This is a schematic diagram of the connection between the rear axle sleeve and the rear axle trailing arm of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of the rear axle sleeve of the present invention;

[0023] Figure 4 This is a schematic diagram of the rear axle trailing arm of the present invention.

[0024] The markings in the diagram are as follows: 1. Rear axle sleeve; 11. Boss; 12. Mounting platform; 13. Mounting through hole; 14. Bolt; 15. Nut; 2. Rear axle trailing arm; 21. Inner cavity; 22. Mounting hole; 23. Assembly mating surface; 24. Leakage hole; 3. Connecting weld; 31. Welding mating surface; 32. Welding mating edge; 4. Closed crossbeam; 5. Spring seat; 6. Shock absorber bracket; 7. Wheel hub mounting bracket; 8. Wheel hub mounting plate; 9. Wiring harness bracket. Detailed Implementation

[0025] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention, and to facilitate its implementation.

[0026] like Figures 1 to 4 As shown, the rear axle sleeve and rear axle trailing arm connection structure has a boss 11 on the rear axle sleeve 1, and the rear axle sleeve 1 and the rear axle trailing arm 2 are fixedly connected.

[0027] A boss 11 is provided on the rear axle sleeve 1. Since the boss 11 is not fixedly connected to the rear axle trailing arm 2, the rear axle sleeve 1 and the rear axle trailing arm 2 can be formed separately. The rear axle sleeve 1 or the rear axle trailing arm 2 can be designed with different dimensions to meet different assembly requirements, thus increasing versatility. If the rear axle sleeve 1 is deformed or damaged, it can be easily replaced locally, avoiding the high cost of replacing the entire rear axle assembly, resulting in lower maintenance costs. The boss 11 changes the traditional connection method between the rear axle sleeve 1 and the rear axle trailing arm 2, providing a bolt 14 connection between the rear axle sleeve 1 and the rear axle trailing arm 2. At the joint, bolts 14 and nuts 15 are used to connect the rear axle sleeve 1 and the rear axle longitudinal arm 2 through the mounting holes 22 and mounting through holes 13 on the boss 11. The boss 11 does not occupy the welding position of the two and maintains the shape of the weld and the spacing between adjacent welds. This avoids the problem of the rear axle sleeve 1 and the rear axle longitudinal arm 2 cracking and separating from the rear axle longitudinal arm 2 when subjected to large loads or continuous alternating loads, which would cause the rear axle sleeve 1 and the rear axle longitudinal arm 2 to fall off, resulting in the detachment of the rear suspension module of the car chassis.

[0028] like Figure 4 As shown, the rear axle trailing arm 2 has an inner cavity 21 at its end, and a boss 11 extends into the inner cavity 21. The boss 11 and the rear axle trailing arm 2 are connected by bolts 14 and nuts 15. After the boss 11 extends into the inner cavity 21, the positioning step between the rear axle sleeve 1 and the rear axle trailing arm 2 is eliminated, improving assembly efficiency. It provides a bolt 14 connection method for connecting the rear axle sleeve 1 and the rear axle trailing arm 2. Furthermore, the boss 11 is not exposed, having a concealed effect, and will not affect the dimensions of adjacent components or the rear axle assembly. The setting of the boss 11, combined with the weld, improves the stability and reliability of the structure, meets the requirements of long-term stable connection, facilitates maintenance, and ensures structural safety. The synergistic use of bolt 14 connection and welding can also improve the efficiency and reliability of the connection, while meeting the requirement of simple connection. Moreover, during subsequent welding, the two can maintain a stable relative position, thereby ensuring the uniformity of the weld at the connection point, providing better sealing performance and effectively dispersing and bearing various external forces.

[0029] like Figure 2As shown, a mounting platform 12 is provided on the boss 11, and a mounting through hole 13 is provided in the middle of the mounting platform 12. A mounting hole 22 is provided at the end of the rear axle sleeve 1. Bolts 14 pass through the mounting holes 22 and 13, and bolts 14 and nuts 15 are provided in pairs. The mounting platforms 12 are arranged on both sides of the boss 11, which helps to distribute the force of the bolt 14 connection and avoid deformation of the boss 11 that would affect the connection strength between the rear axle sleeve 1 and the rear axle trailing arm 2. In order to improve the connection reliability of bolts 14 and nuts 15 connecting the rear axle sleeve 1 and the rear axle trailing arm 2, the specifications of bolts 14 and nuts 15 are not lower than M10, and the number on one side is not less than 2. In order to improve the welding matching accuracy and assembly accuracy of the rear axle sleeve 1 and the rear axle trailing arm 2, the welding matching surface 31, the mounting platform 12 and the mounting through hole 13 of the rear axle sleeve 1 are machined, the welding matching edge 32 of the rear axle trailing arm 2 is laser cut, and the assembly matching surface 23 is hydroformed to ensure the stability of welding matching and assembly matching.

[0030] like Figure 3 As shown, the rear axle sleeve 1 has welding mating surfaces 31 on both sides of the boss 11, and the rear axle longitudinal arm 2 has a welding mating edge 32 at its end. The welding mating surfaces 31 and welding mating edges 32 are in contact, and a connecting weld 3 is provided between the welding mating surfaces 31 and welding mating edges 32. The boss 11 is located between the connecting welds 3. The boss 11 extends into the inner cavity 21, and the rear axle sleeve 1 and the rear axle longitudinal arm 2 will not move relative to each other. The welding mating surfaces 31 and welding mating edges 32 are in complete contact, which ensures that the dimensions of the connecting weld 3 are stable and do not easily change. This facilitates the welding process, improves the reliability of the welding, and ensures the structural quality of the product.

[0031] like Figure 4 As shown, a drain hole 24 is provided at the end of the rear axle trailing arm 2, and the drain hole 24 is located between the ends of the welding mating edges 32. Drain holes 24 are designed on the upper and lower sides of the welding front end of the rear axle trailing arm 2 and the rear axle sleeve 1 to prevent the inner cavity 21 of the rear axle sleeve 1 and the rear axle trailing arm 2 from being completely sealed during welding. This would cause the electrophoretic liquid to flow in at the welding point and not flow out, resulting in poor electrophoresis in the inner cavity 21 and causing the corrosion resistance to be substandard. Therefore, the weld is segmented by opening a drain hole 24 at the very front end of the welding between the rear axle trailing arm 2 and the rear axle sleeve 1.

[0032] like Figure 4 As shown, the connecting weld 3 extends to the leakage hole 24 and extends outward by 5-10 mm. The segmented connecting weld 3 between the rear axle sleeve 1 and the rear axle longitudinal arm 2 should be as long as possible, welded to the leakage hole 24 of the rear axle longitudinal arm 2 and extended outward by 5-10 mm, to ensure the weld connection strength and improve the reliability of the welded connection between the rear axle sleeve 1 and the rear axle longitudinal arm 2.

[0033] like Figure 3As shown, the boss 11 is square, and the ends of the boss 11 are rounded. The boss 11 and the rear axle sleeve 1 are an integral structure. The square boss 11 is easy to process and can also maintain the consistency of the gap between the boss 11 and the two sides of the inner cavity 21. The ends of the boss 11 are rounded to reduce stress concentration and ensure its structural reliability.

[0034] like Figure 3 As shown, the rear axle sleeve 1 is circular, and the welded mating edge 32 is arc-shaped. In this structure, the arc-shaped welded mating edge 32 provides a better fit, which helps ensure accurate alignment after assembly.

[0035] like Figure 1 As shown, a closed crossbeam 4 is fixedly connected between the rear axle trailing arms 2, and a spring seat 5 connects the rear axle trailing arms 2 and the closed crossbeam 4. The bottom of the rear axle trailing arms 2 is equipped with a shock absorber bracket 6, a wheel hub mounting bracket 7, a wheel hub mounting plate 8, and a wiring harness bracket 9. This rear axle sleeve and rear axle trailing arm connection structure consists of components such as the rear axle sleeve 1, left and right rear axle trailing arms 2, closed crossbeam 4, left and right spring seats 5, left and right shock absorber mounting brackets 6, left and right wheel hub mounting brackets 7, and wheel hub mounting plate 8, which are connected by welding. The rear axle sleeve 1 and rear axle trailing arms 2 are additionally connected by bolts 14 and nuts 15. The closed crossbeam 4 is a V-shaped closed beam, and the overall structure of the rear axle welded assembly is H-shaped, which helps to improve the overall structural strength. Using the above-mentioned rear axle sleeve and rear axle trailing arm connection structure can effectively improve the vehicle handling stability, NVH performance, and safety performance of the rear axle assembly, and has better versatility, thus adapting to installation in more types of vehicles.

[0036] The vehicle includes the aforementioned rear axle sleeve and rear axle trailing arm connection structure.

[0037] To improve the welding and assembly accuracy of the rear axle sleeve 1 and the rear axle longitudinal arm 2, the rear axle sleeve 1 is machined to improve the product qualification rate and reduce the difficulty of welding and assembly matching between the rear axle sleeve 1 and the rear axle longitudinal arm 2. To improve the strength and reliability of the rear axle sleeve 1, the rear axle sleeve 1 is made of cast iron to increase the wall thickness, while ensuring the layout space and assembly dimensions.

[0038] The assembly process is as follows: Insert the boss 11 of the rear axle sleeve 1 into the inner cavity 21 of the rear axle trailing arm 2, fit the mounting platform 12 with the assembly mating surface 23, and pass the bolt 14 through the mounting holes 22 and 13 in sequence and connect them with the nut 15 to assemble the rear axle sleeve 1 and the rear axle trailing arm 2 together. Weld along the connection weld 3 between the rear axle sleeve 1 and the rear axle trailing arm 2 to achieve a fixed connection between the rear axle sleeve 1 and the rear axle trailing arm 2. The operation methods of the rear axle sleeve 1 and the rear axle trailing arm 2 on both sides of the rear axle assembly are the same.

[0039] The rear axle sleeve and rear axle trailing arm connection structure features a boss 11 on the rear axle sleeve 1, which alters the connection method between the rear axle sleeve 1 and the rear axle trailing arm 2. It provides additional bolt 14 connections, and the boss 11 extends into the inner cavity 21 to maintain the shape and spacing of the weld, ensuring the stability of the weld matching. The bolt 14 connection and welding work together to improve the load-bearing performance of the rear axle sleeve 1, meet the load-bearing requirements, and prevent the weld of the poorly welded rear axle sleeve 1 and rear axle trailing arm 2 from cracking, separating, and falling off under large loads or continuous alternating loads, thus avoiding the problem of the rear suspension module of the vehicle chassis falling off.

[0040] The rear axle sleeve and rear axle trailing arm connection structure allows the rear axle sleeve 1 and rear axle trailing arm 2 to be formed separately during production. During assembly, it simplifies the assembly steps of the rear axle sleeve 1 and rear axle trailing arm 2, improves work efficiency, and the setting of the boss 11 does not occupy space or affect the original structure of the rear axle assembly, thus having the advantage of small space occupation.

[0041] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A connection structure between a rear axle sleeve and a rear axle trailing arm, characterized in that: The rear axle sleeve (1) is provided with a boss (11), and the rear axle sleeve (1) and the rear axle longitudinal arm (2) are fixedly connected; the rear axle longitudinal arm (2) has an inner cavity (21) at its end, and the boss (11) extends into the inner cavity (21). The boss (11) and the rear axle longitudinal arm (2) are connected by a bolt (14) and a nut (15); the boss (11) is provided with a mounting platform (12), and the mounting platform (12) has a mounting through hole (13) in the middle. The rear axle sleeve (1) has a mounting hole (22) at its end, and the bolt (14) passes through the mounting hole (22) and the mounting through hole (13). The bolt (14) and the nut (15) are connected. The rear axle sleeve (1) is provided with welding matching surfaces (31) on both sides of the boss (11), and the rear axle longitudinal arm (2) is provided with welding matching edges (32) at its end. The welding matching surfaces (31) and welding matching edges (32) are in contact. A connecting weld (3) is provided between the welding matching surfaces (31) and welding matching edges (32). The boss (11) is located between the connecting welds (3). The rear axle longitudinal arm (2) is provided with a drain hole (24) at its end. The drain hole (24) is located between the ends of the welding matching edges (32). The connecting weld (3) extends to the drain hole (24) and extends outward by 5-10 mm.

2. The rear axle sleeve and rear axle trailing arm connection structure according to claim 1, characterized in that: The boss (11) is square, and the ends of the boss (11) are rounded.

3. The rear axle sleeve and rear axle trailing arm connection structure according to claim 1, characterized in that: The rear axle sleeve (1) is circular, and the welding matching edge (32) is arc-shaped.

4. The rear axle sleeve and rear axle trailing arm connection structure according to claim 1, characterized in that: A closed crossbeam (4) is fixedly connected between the rear axle longitudinal arms (2), and a spring seat (5) is connected between the rear axle longitudinal arms (2) and the closed crossbeam (4). A shock absorber bracket (6), a wheel hub mounting bracket (7), a wheel hub mounting plate (8), and a wiring harness bracket (9) are provided at the bottom of the rear axle longitudinal arms (2).

5. A vehicle, characterized in that: Includes the rear axle sleeve and rear axle trailing arm connection structure as described in any one of claims 1-4.

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