Rear axle sleeve and rear axle trailing arm connecting structure and vehicle

Abstract

The invention discloses a rear axle sleeve and rear axle trailing arm connecting structure and a vehicle, a boss is arranged on the rear axle sleeve, the rear axle sleeve is fixedly connected with a rear axle trailing arm, by adopting the rear axle sleeve and rear axle trailing arm connecting structure, the rear axle sleeve and rear axle trailing arm welding seam cracking or separation and falling off can be avoided, and the safety performance of a rear axle assembly is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile chassis, and in particular relates to a connection structure of a rear axle sleeve and a rear axle longitudinal arm. Background Art

[0002] In the field of automobile chassis technology, the rear axle assembly belongs to the rear suspension system of the automobile chassis and is an important component that affects the vehicle's handling, NVH, and safety. The rear axle suspension is widely used by most car companies in small cars, compact cars, MPVs, and other models because of its simple structure, small number of parts, low cost, small layout space, and easy maintenance.

[0003] The rear axle sleeve is an important component of the rear axle assembly, and is often connected to the rear axle longitudinal arm by welding. As a key load-bearing component in the rear axle assembly, the rear axle sleeve needs to withstand large impact loads and high-frequency dynamic loads. Since the rear axle sleeve is connected to the rear axle longitudinal arm by welding, the welding strength and fatigue performance of the weld between the rear axle sleeve and the rear axle longitudinal arm are very high. However, at the same time, the welding levels of various rear axle assembly manufacturers vary, and some manufacturers have insufficient welding quality control capabilities, resulting in poor welding of the connection weld between the rear axle sleeve and the rear axle longitudinal arm of some rear axle assemblies. When subjected to large loads or continuous alternating loads, the weld between the rear axle sleeve and the rear axle longitudinal arm cracks, and the rear axle sleeve and the rear axle longitudinal arm separate and fall off, causing the rear suspension module of the vehicle chassis to fall off, which in turn causes safety accidents.

[0004] The utility model patent with announcement number CN203358211U was published on December 25, 2013, and the name is a torsion beam rear axle for automobiles, which includes a longitudinal arm arranged along the forward direction of the vehicle, the rear end of the longitudinal arm is connected to the wheel, the front end of the longitudinal arm is provided with a bushing sleeve, and the longitudinal arm is connected to the vehicle body through a rubber bushing arranged in the bushing sleeve; the bushing sleeve is provided with an open groove along the axial direction of the bushing sleeve, and fixed brackets are provided on both sides of the open groove, and the two fixed brackets are fastened and connected by bolts and nuts. The torsion beam rear axle for automobiles also cannot solve the above technical problems. Summary of the invention

[0005] The purpose of the present invention is to provide a rear axle sleeve and rear axle longitudinal arm connection structure and a vehicle that can avoid cracking or separation of the weld between the rear axle sleeve and the rear axle longitudinal arm and improve the safety performance of the rear axle assembly in view of the deficiencies in the prior art.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] The rear axle sleeve and the rear axle longitudinal arm connection structure, the rear axle sleeve is provided with a boss, and the rear axle sleeve and the rear axle longitudinal arm are fixedly connected.

[0008] An inner cavity is provided at the end of the rear axle longitudinal arm, the boss extends into the inner cavity, and the boss and the rear axle longitudinal arm are connected with bolts and nuts.

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

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

[0011] The end of the rear axle longitudinal arm is provided with a leakage hole, and the leakage hole is located between the ends of the welding matching edges.

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

[0013] The boss is square, and the end of the boss has a rounded transition.

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

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

[0016] A vehicle comprises the rear axle sleeve and rear axle longitudinal arm connection structure as claimed in the claims.

[0017] The technical effect of the present invention is as follows: by adopting the rear axle sleeve and rear axle longitudinal arm connection structure of the present invention, a boss is arranged on the rear axle sleeve, the connection mode of the rear axle sleeve and the rear axle longitudinal arm is changed, an additional bolt connection is provided, and the boss extends into the inner cavity to maintain the shape and spacing of the weld, thereby ensuring the stability of the welding matching. The bolt connection and welding work together to improve the force performance of the rear axle sleeve, meet the load-bearing requirements, and avoid the problem that the weld of the poorly welded rear axle sleeve and the rear axle longitudinal arm is cracked, separated and fallen off when subjected to a large load or a continuous alternating load, causing the rear suspension module of the automobile chassis to fall off.

[0018] The rear axle sleeve and the rear axle longitudinal arm connection structure can be formed separately during production, and the assembly steps of the rear axle sleeve and the rear axle longitudinal arm are simplified during assembly, thereby improving operating efficiency. In addition, the arrangement of the boss does not take up space and does not affect the original structure of the rear axle assembly, and has the advantage of occupying a small layout space. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] This specification includes the following drawings, which show the following contents:

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

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

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

[0023] Figure 4 It is a structural schematic diagram of the rear axle longitudinal arm of the present invention.

[0024] The markings in the figure are: 1. rear axle sleeve; 11. boss; 12. mounting platform; 13. mounting hole; 14. bolt; 15. nut; 2. rear axle longitudinal arm; 21. inner cavity; 22. mounting hole; 23. assembly matching surface; 24. leakage hole; 3. connecting weld; 31. welding matching surface; 32. welding matching 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 DESCRIPTION

[0025] The specific implementation methods of the present invention are further explained in detail below by describing the embodiments with reference to the accompanying drawings, with the aim of helping 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 facilitating their implementation.

[0026] like Figures 1 to 4 As shown, the rear axle sleeve and the rear axle longitudinal arm connection structure, 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.

[0027] A boss 11 is provided on the rear axle sleeve 1. Since the boss 11 is not fixedly connected to the rear axle longitudinal arm 2, the rear axle sleeve 1 and the rear axle longitudinal arm 2 can be formed separately, and the rear axle sleeve 1 or the rear axle longitudinal arm 2 can be designed in size separately, so as to meet different types of assembly requirements, and the versatility is higher. If the rear axle sleeve 1 is deformed or damaged, it can also be conveniently replaced locally, avoiding the high cost of replacing the entire rear axle assembly, and the maintenance cost is lower. The setting of the boss 11 changes the traditional connection method between the rear axle sleeve 1 and the rear axle longitudinal arm 2, and provides a bolt 14 connection for the rear axle sleeve 1 and the rear axle longitudinal arm 2. At the connection part, the rear axle sleeve 1 and the rear axle longitudinal arm 2 are connected together by bolts 14 and nuts 15 through the mounting holes 22 of the rear axle longitudinal arm 2 and the mounting through holes 13 on the boss 11, and 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, thereby avoiding the problem that the weld between the rear axle sleeve 1 and the rear axle longitudinal arm 2 with poor welding is cracked when subjected to a large load or continuous alternating load, and the rear axle sleeve 1 and the rear axle longitudinal arm 2 are separated and fall off, causing the rear suspension module of the automobile chassis to fall off.

[0028] like Figure 4 As shown, the end of the rear axle longitudinal arm 2 is provided with an inner cavity 21, and the boss 11 extends into the inner cavity 21. The boss 11 and the rear axle longitudinal arm 2 are connected by bolts 14 and nuts 15. After the boss 11 extends into the inner cavity 21, the positioning step of the rear axle sleeve 1 and the rear axle longitudinal arm 2 is omitted, the assembly efficiency is improved, and a bolt 14 connection mode is provided for the connection between the rear axle sleeve 1 and the rear axle longitudinal arm 2. In addition, the boss 11 is not exposed, has a hidden effect, and will not affect the adjacent components or the size of the rear axle assembly. The setting of the boss 11 is combined with the weld to improve the stability and reliability of the structure, meet the long-term stable connection, facilitate maintenance and ensure the safety of the structure. The coordinated use of the bolt 14 connection and welding can also improve the efficiency and reliability of the connection, and meet the requirements of simple connection at the same time; and in the subsequent welding, the two can maintain a stable relative position, thereby ensuring the uniformity of the weld at the connection between the two, and can provide better sealing performance and effectively disperse and withstand various external forces.

[0029] like Figure 2As shown, a mounting platform 12 is provided on the boss 11, a mounting 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, a bolt 14 passes through the mounting hole 22 and the mounting hole 13, and the bolt 14 and the nut 15 are arranged in pairs. The mounting platforms 12 are arranged on both sides of the boss 11, which is conducive to the dispersion of the force of the bolt 14 connection, and avoids the deformation of the boss 11 and affects the connection strength between the rear axle sleeve 1 and the rear axle longitudinal arm 2. In order to improve the connection reliability of the bolt 14 and the nut 15 connecting the rear axle sleeve 1 and the rear axle longitudinal arm 2, the specifications of the bolt 14 and the nut 15 are not less than M10, and the number of single sides 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 longitudinal arm 2, the welding matching surface 31 of the rear axle sleeve 1, the mounting platform 12 and the mounting hole 13 are machined, the welding matching edge 32 of the rear axle longitudinal arm 2 is laser cut, and the assembly matching surface 23 is hydraulically formed to ensure the stability of welding matching and assembly matching.

[0030] like Figure 3 As shown, the rear axle sleeve 1 is provided with welding matching surfaces 31 on both sides of the boss 11, and the end of the rear axle longitudinal arm 2 is provided with a welding matching edge 32, the welding matching surface 31 is in contact with the welding matching edge 32, and a connecting weld 3 is provided between the welding matching surface 31 and the welding matching edge 32, and 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, and the welding matching surface 31 is in full contact with the welding matching edge 32, which ensures that the size of the connecting weld 3 is stable and not easy to change, which can not only facilitate the welding operation process, but also improve the reliability of welding and ensure the quality of product structure.

[0031] like Figure 4 As shown, a leakage hole 24 is provided at the end of the rear axle longitudinal arm 2, and the leakage hole 24 is located between the ends of the welding matching edge 32. The leakage holes 24 are designed on the upper and lower sides of the front end of the welding between the rear axle longitudinal arm 2 and the rear axle sleeve 1 to avoid the closed cavity 21 of the rear axle sleeve 1 and the rear axle longitudinal arm 2 and the fully closed welding, which causes the electrophoresis liquid at the welding point to flow in and cannot flow out, resulting in poor electrophoresis of the inner cavity 21, causing the problem of unqualified anti-corrosion performance. Therefore, the leakage hole 24 is opened at the front end of the welding between the rear axle longitudinal arm 2 and the rear axle sleeve 1 to segment the weld.

[0032] like Figure 4 As shown, the connecting weld 3 extends to the leakage hole 24 and extends outward by 5 to 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 to 10 mm to ensure the strength of the weld connection and improve the reliability of the welding 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 end of the boss 11 is rounded. The boss 11 and the rear axle sleeve 1 are an integral structure. The square boss 11 is easy to process and shape, and can also keep the boss 11 and the gap on both sides of the inner cavity 21 consistent. The end of the boss 11 is 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 welding matching edge 32 is arc-shaped. In the above structure, the arc-shaped welding matching edge 32 has a better fit, which is conducive to ensuring that the two are accurately aligned after assembly.

[0035] like Figure 1 As shown, a closed crossbeam 4 is fixedly connected between the rear axle longitudinal arms 2, a spring seat 5 is connected between the rear axle longitudinal arms 2 and the closed crossbeam 4, and a shock absorber bracket 6, a wheel hub mounting bracket 7, a wheel hub mounting plate 8 and a harness bracket 9 are provided at the bottom of the rear axle longitudinal arm 2. The rear axle sleeve and rear axle longitudinal arm connection structure is composed of a rear axle sleeve 1, left and right rear axle longitudinal arms 2, a 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, a wheel hub mounting plate 8 and other components, which are connected by welding, and the rear axle sleeve 1 and the rear axle longitudinal arm 2 are additionally connected by bolts 14 and nuts 15; wherein, the closed crossbeam 4 is a V-shaped closed beam, and the overall structure of the rear axle welding assembly is H-shaped, which is conducive to improving the overall structural strength. The above-mentioned rear axle sleeve and rear axle longitudinal arm connection structure can effectively improve the vehicle handling stability, NVH performance, and safety performance of the rear axle assembly, and has better versatility, so that it can be installed in more types of vehicles.

[0036] A vehicle comprises the above-mentioned rear axle sleeve and rear axle longitudinal arm connection structure.

[0037] In order to improve the welding matching accuracy and assembly accuracy between the rear axle sleeve 1 and the rear axle longitudinal arm 2, the rear axle sleeve 1 adopts a machining process to improve the product qualification rate and reduce the difficulty of welding matching and assembly matching between the rear axle sleeve 1 and the rear axle longitudinal arm 2; in order to improve the strength of the rear axle sleeve 1 and improve the reliability, the rear axle sleeve 1 adopts a cast iron process to increase the wall thickness of the rear axle sleeve 1 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 longitudinal arm 2, fit the mounting platform 12 with the assembly matching surface 23, and pass the bolt 14 through the mounting hole 22 and the mounting through hole 13 in sequence and connect them with the nut 15. Then, the rear axle sleeve 1 and the rear axle longitudinal arm 2 can be assembled together, and welding is performed along the connecting weld 3 between the rear axle sleeve 1 and the rear axle longitudinal arm 2 to achieve a fixed connection between the rear axle sleeve 1 and the rear axle longitudinal arm 2. The rear axle sleeve 1 and the rear axle longitudinal arm 2 on both sides of the rear axle assembly operate in the same manner.

[0039] The rear axle sleeve and rear axle longitudinal arm connection structure has a boss 11 on the rear axle sleeve 1, which changes the connection mode between the rear axle sleeve 1 and the rear axle longitudinal arm 2, provides an additional bolt 14 connection, and the boss 11 extends into the inner cavity 21 to maintain the shape and spacing of the weld, thereby ensuring the stability of the welding match. The bolt 14 connection and welding work together to improve the force performance of the rear axle sleeve 1, meet the load-bearing requirements, and avoid the problem that the weld between the rear axle sleeve 1 and the rear axle longitudinal arm 2 with poor welding cracks, separates and falls off when subjected to a large load or a continuous alternating load, causing the rear suspension module of the automobile chassis to fall off.

[0040] The rear axle sleeve and rear axle longitudinal arm connection structure can be formed separately during production. During assembly, the assembly steps of the rear axle sleeve 1 and the rear axle longitudinal arm 2 are simplified, and the working efficiency is improved. In addition, the setting of the boss 11 does not take up space and does not affect the original structure of the rear axle assembly, and has the advantage of occupying a small layout space.

[0041] The present invention is described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention; or the above concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A connection structure between a rear axle sleeve and a rear axle longitudinal 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.

2. The rear axle sleeve and rear axle longitudinal arm connection structure according to claim 1, characterized in that: An inner cavity (21) is provided at the end of the rear axle longitudinal arm (2), the boss (11) extends into the inner cavity (21), and the boss (11) and the rear axle longitudinal arm (2) are connected by bolts (14) and nuts (15).

3. The rear axle sleeve and rear axle longitudinal arm connection structure according to claim 2, characterized in that: A mounting platform (12) is provided on the boss (11), a mounting 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), the bolt (14) passes through the mounting hole (22) and the mounting hole (13), and the bolt (14) and the nut (15) are arranged in pairs.

4. The rear axle sleeve and rear axle longitudinal arm connection structure according to claim 3, characterized in that: The rear axle sleeve (1) is provided with welding matching surfaces (31) on both sides of the boss (11), the end of the rear axle longitudinal arm (2) is provided with a welding matching edge (32), the welding matching surface (31) is in contact with the welding matching edge (32), a connecting weld (3) is provided between the welding matching surface (31) and the welding matching edge (32), and the boss (11) is located between the connecting welds (3).

5. The rear axle sleeve and rear axle longitudinal arm connection structure according to claim 4, characterized in that: The end of the rear axle longitudinal arm (2) is provided with a leakage hole (24), and the leakage hole (24) is located between the ends of the welding matching edge (32).

6. The rear axle sleeve and rear axle longitudinal arm connection structure according to claim 5, characterized in that: The connecting weld (3) extends to the liquid leakage hole (24) and extends outward by 5 to 10 mm.

7. The rear axle sleeve and rear axle longitudinal arm connection structure according to claim 1, characterized in that: The boss (11) is square in shape, and the end of the boss (11) has a rounded transition.

8. The rear axle sleeve and rear axle trailing arm connection structure according to claim 4, characterized in that: The rear axle sleeve (1) is circular, and the welding matching edge (32) is arc-shaped.

9. The rear axle sleeve and rear axle longitudinal arm connection structure according to claim 6, characterized in that: A closed cross beam (4) is fixedly connected between the rear axle longitudinal arms (2), a spring seat (5) is connected between the rear axle longitudinal arms (2) and the closed cross beam (4), and 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).

10. A vehicle, characterized in that: It comprises the rear axle sleeve and rear axle longitudinal arm connection structure as described in any one of claims 1 to 9.

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