Subframe reinforcement plate with welded connection structure, installation method and subframe

Abstract

This invention discloses a subframe reinforcing plate with a welded connection structure, an installation method, and a subframe. The subframe reinforcing plate includes two subframe longitudinal beam upper plates and one subframe front crossbeam upper plate. The two subframe longitudinal beam upper plates are respectively connected to both ends of the subframe front crossbeam upper plate via a welded connection structure. The subframe longitudinal beam upper plates and the subframe front crossbeam upper plates have overlapping surfaces at the connection points, and the connection is achieved by welding. The subframe longitudinal beam upper plates and the subframe front crossbeam upper plates are connected by a welded connection structure. The design of the welded connection structure can significantly reduce local stress in the weld, improve the reliability and service life of the subframe, and enhance modal and stiffness performance. Compared with existing methods that improve the overall structure of the subframe, this invention only requires improvements to the local structure of the subframe, without the need for new molds, resulting in low cost and simple structure.

Description

Technical Field

[0001] This invention relates to the field of automotive technology, specifically to a subframe reinforcement plate with a welded connection structure, an installation method, and a subframe. Background Technology

[0002] The subframe is one of the most important structural components in a vehicle. It not only connects to the vehicle body but also serves as a crucial support structure for components such as the stabilizer bar, steering gear, engine mounts, and control arms. During operation, vehicles are subjected to impacts from the ground in various directions and engine loads, requiring the subframe to possess sufficient strength due to the complex stresses. In terms of comfort, the subframe needs to isolate vibrations and noise, reducing their transmission to the passenger compartment; therefore, its modal characteristics and stiffness are also critical.

[0003] Currently, most subframe designs focus on the overall subframe structure. For example, improvements to the overall subframe structure can increase its strength. However, these improvements involve significant structural modifications, requiring the design of new molds, resulting in limited scalability and high development costs. Another approach involves adjusting the mounting positions of the upper suspension, control arm brackets, and bend arm brackets to improve scalability and reduce development costs. However, these adjustments may affect the stress distribution within the subframe, thereby impacting its strength.

[0004] In addition, the inventors discovered that the existing front subframe has a small cross-sectional area of ​​longitudinal beams (left and right longitudinal beams), and in order to maintain the rigidity of the connection between the front end of the subframe longitudinal beam and the body longitudinal beam, the front end of the subframe longitudinal beam needs to be arranged at an acute angle with the body longitudinal beam. As a result, the front part of the entire front subframe longitudinal beam does not crush during a collision, which in turn pulls the front section of the body longitudinal beam towards the passenger compartment, causing a large amount of deformation in the passenger compartment, which is detrimental to the protection of the occupants. Summary of the Invention

[0005] To address the problems existing in the prior art, the present invention provides a subframe reinforcement plate with a welded connection structure, an installation method, and a subframe. By improving the local structural design of the subframe and setting a welded connection structure on the subframe reinforcement plate, the local stress of the weld can be significantly reduced, thereby improving the reliability and service life of the subframe, as well as enhancing its modal and stiffness performance.

[0006] The technical solution of the present invention is as follows:

[0007] In a first aspect of the invention, a subframe reinforcing plate with a welded connection structure is provided, comprising: two subframe longitudinal beam upper plates and a subframe front crossbeam upper plate, wherein the two subframe longitudinal beam upper plates are respectively connected to both ends of the subframe front crossbeam upper plate by a welded connection structure; the subframe longitudinal beam upper plates and the subframe front crossbeam upper plate have overlapping surfaces at the connection position, and the connection position is welded.

[0008] In some embodiments of the present invention, the welded connection structure includes a welded surface disposed on the upper plate of the longitudinal beam of the subframe and a welded line disposed on the upper plate of the front crossbeam of the subframe.

[0009] The welding surface includes the side surface of the upper plate of the longitudinal beam, the rounded corner surface of the upper plate of the longitudinal beam, and the top surface of the upper plate of the longitudinal beam, which are connected in sequence.

[0010] The welding line includes a side welding line, a rounded corner welding line, and a top welding line connected in sequence.

[0011] In some embodiments of the present invention, the side surface of the upper plate of the longitudinal beam is welded to the side weld line, the rounded corner surface of the upper plate of the longitudinal beam is welded to the rounded corner weld line, and the top surface of the upper plate of the longitudinal beam is welded to the top surface weld line.

[0012] In some embodiments of the present invention, the side surface and the top surface of the upper plate of the longitudinal beam are respectively perpendicular to the rounded corner surface of the upper plate of the longitudinal beam.

[0013] The side welding line and the top welding line are respectively set perpendicular to the rounded corner welding line.

[0014] In some embodiments of the present invention, the top surface welding line is arc-shaped, and the side of the top surface of the upper plate of the longitudinal beam is arc-shaped.

[0015] In some embodiments of the present invention, the upper plate of the subframe longitudinal beam and the upper plate of the subframe front crossbeam are disposed at the front of the subframe assembly.

[0016] In some embodiments of the present invention, the upper plate of the subframe longitudinal beam and the upper plate of the subframe front crossbeam are both integral structures formed by stamping high-strength steel.

[0017] In a second aspect of the present invention, a method for installing a subframe reinforcing plate with a welded connection structure is provided, comprising: welding two subframe longitudinal beam upper plates and one subframe front crossbeam upper plate together into an integral structure through a welded connection structure to form a subframe reinforcing plate;

[0018] The subframe reinforcement plate is fixed to the crossbeams and longitudinal beams at the front of the subframe using a welding process.

[0019] In a third aspect of the invention, a subframe is provided, comprising a subframe reinforcing plate with a welded connection structure as described in the first aspect. The subframe is provided with a front subframe crossbeam, a middle subframe crossbeam, a rear subframe crossbeam, a front subframe longitudinal beam, and a rear subframe longitudinal beam. The two ends of the front subframe crossbeam and the middle subframe crossbeam are connected by the front subframe longitudinal beam, and the two ends of the middle subframe crossbeam and the rear subframe crossbeam are connected by the rear subframe longitudinal beam. The upper plate of the subframe longitudinal beam is mounted on the front subframe longitudinal beam, and the upper plate of the front subframe crossbeam is mounted on the front subframe crossbeam.

[0020] In some embodiments of the present invention, the subframe is provided with stabilizer bar mounting holes, steering gear mounting holes, engine mount mounting holes, and body connection points.

[0021] One or more technical solutions of the present invention have the following beneficial effects:

[0022] (1) The subframe reinforcing plate with welded connection structure provided by the present invention includes two subframe longitudinal beam upper plates and one subframe front crossbeam upper plate. The subframe longitudinal beam upper plates and the subframe front crossbeam upper plates are connected by a welded connection structure. The design of the welded connection structure can significantly reduce the local stress of the weld, improve the reliability and service life of the subframe, and enhance the modal and stiffness performance. Compared with the existing improvement of the overall structure of the subframe, the present invention only needs to optimize the welding of the local structure of the subframe to improve the performance of the subframe. It also does not require the creation of new molds, and is low in cost and simple in structure.

[0023] (2) The subframe reinforcing plate with welded connection structure provided by the present invention has an overlapping surface between the upper plate of the longitudinal beam of the subframe and the upper plate of the front crossbeam of the subframe. The overlapping surfaces of the two are connected by welding. The welding line of the top surface of the upper plate of the longitudinal beam of the subframe and the top surface of the upper plate of the front crossbeam of the subframe is set into an arc shape. The connection length is increased and the strength performance is enhanced by the direction of welding.

[0024] (3) The subframe reinforcing plate with welded connection structure provided by the present invention, the upper plate of the subframe longitudinal beam and the upper plate of the subframe front crossbeam are stamped from high-strength steel, with simple structure, easy to stamp and strong versatility; the upper plate of the subframe longitudinal beam and the upper plate of the subframe front crossbeam can be directly stamped by stamping process according to the shape of the subframe, without changing the original structure of the subframe to strengthen the strength and rigidity of the subframe, and without setting up new molds, thus reducing development costs.

[0025] (4) The installation method of the subframe reinforcement plate with welded connection structure provided by the present invention allows the processed subframe reinforcement plate to be directly installed on the subframe by bolts. The whole installation method is simple and easy to implement.

[0026] (5) The subframe provided by the present invention can effectively improve the strength performance of the subframe by designing the distribution of the crossbeams and longitudinal beams. Under the same subframe strength performance requirements, the thickness of the subframe, the upper plate of the longitudinal beam of the subframe and the upper plate of the front crossbeam of the subframe can be reduced by designing the welding direction, thereby reducing weight and cost.

[0027] (6) The weld connection structure on the subframe reinforcement plate provided by the present invention can also be applied to the design of stabilizer bars, steering gears, engine mount mounting brackets and body welding on the subframe, and has a wide range of applications. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the subframe reinforcement plate with a welded connection structure according to Embodiment 1 of the present invention;

[0029] Figure 2 This is a schematic diagram of the structure of the upper plate of the longitudinal beam of the subframe in Embodiment 1 of the present invention;

[0030] Figure 3 This is a schematic diagram of the structure of the upper plate of the front crossbeam of the subframe in Embodiment 1 of the present invention;

[0031] Figure 4 This is a schematic diagram of the subframe assembly structure of Embodiment 3 of the present invention.

[0032] In the diagram: 1. Upper plate of the subframe longitudinal beam; 101. Side of the upper plate of the longitudinal beam; 102. Rounded corner surface of the upper plate of the longitudinal beam; 103. Top surface of the upper plate of the longitudinal beam; 2. Upper plate of the front crossbeam of the subframe; 201. Side welding line; 202. Rounded corner welding line; 203. Top surface welding line; 3. Subframe; 301. Front crossbeam of the subframe; 302. Middle crossbeam of the subframe; 303. Rear crossbeam of the subframe; 304. Front longitudinal beam of the subframe; 305. Rear longitudinal beam of the subframe. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0034] Example 1

[0035] In a typical embodiment of the present invention, a subframe reinforcing plate with a welded connection structure is proposed, such as... Figure 1 As shown, the system includes two subframe longitudinal beam upper plates 1 and one subframe front crossbeam upper plate 2. The two subframe longitudinal beam upper plates 1 are respectively connected to both ends of the subframe front crossbeam upper plate 2 via welded connection structures. The connection points of the subframe longitudinal beam upper plates 1 and the subframe front crossbeam upper plate 2 have overlapping surfaces, and the connection is achieved by welding. The width of the overlapping surface is 8-10mm. A width of not less than 8mm ensures welding quality; if the width is too large, although welding quality can still be guaranteed, it will increase weight, leading to increased weight and cost.

[0036] In this embodiment, the welding connection structure includes a welding surface on the upper plate 1 of the subframe longitudinal beam and a welding line on the upper plate 2 of the front crossbeam of the subframe. The upper plate of the subframe longitudinal beam and the upper plate of the front crossbeam of the subframe are welded together by welding the welding surface and the welding line.

[0037] like Figure 2 As shown, the welding surface includes the longitudinal beam upper plate side surface 101, the longitudinal beam upper plate rounded corner surface 102, and the longitudinal beam upper plate top surface 103 connected in sequence. The longitudinal beam upper plate side surface 101 and the longitudinal beam upper plate top surface 103 are respectively arranged perpendicular to the longitudinal beam upper plate rounded corner surface 102, so that the longitudinal beam upper plate side surface 101, the longitudinal beam upper plate rounded corner surface 102, and the longitudinal beam upper plate top surface 103 form an L-shaped structure to engage the subframe longitudinal beam upper plate 1 with the subframe longitudinal beam.

[0038] like Figure 3 As shown, the welding line includes a side welding line 201, a rounded corner welding line 202, and a top welding line 203 connected in sequence. The side welding line 201 and the top welding line 203 are respectively arranged perpendicular to the rounded corner welding line 202, so that the shape of the welding line matches the shape of the welding surface, so as to realize the connection between the welding surface and the welding line.

[0039] Specifically, when connecting the welding surfaces and welding lines, the side surface 101 of the upper plate of the longitudinal beam is welded to the side welding line 201, the rounded corner surface 102 of the upper plate of the longitudinal beam is welded to the rounded corner welding line 202, and the top surface 103 of the upper plate of the longitudinal beam is connected to the top surface welding line 203.

[0040] In this embodiment, the top surface welding line 203 is arc-shaped, and the side of the top surface 103 of the longitudinal beam upper plate is arc-shaped. By setting the welding line on the top surface of the subframe front crossbeam to be arc-shaped, the distance between two equal points is longer than that of a straight line. This significantly increases the length of the weld, and under the same force, the arc-shaped weld experiences more uniform and smaller stress. Because the distance between two points is longer with the arc-shaped weld, the overlap length of the components increases, and the stiffness and modal performance of the local structure of the subframe assembly are also improved.

[0041] Considering that the subframe may deform during a collision due to limited strength, the subframe reinforcement plate provided in this embodiment has its upper plate of the subframe longitudinal beam and the upper plate of the subframe front cross beam located at the front of the subframe assembly. This can improve the strength of the front end of the subframe and reduce the amount of subframe deformation during a collision.

[0042] In this embodiment, both the upper plate 1 of the subframe longitudinal beam and the upper plate 2 of the subframe front crossbeam are integral structures formed by stamping high-strength steel. The upper plate 1 of the subframe longitudinal beam and the upper plate 2 of the subframe front crossbeam are formed by stamping according to the front end shape of the subframe to be installed.

[0043] The subframe reinforcement plate with welded connection structure provided in this embodiment can be directly installed at the front of the subframe, improving the strength and rigidity of the front of the subframe. At the same time, the subframe reinforcement plate is divided into two subframe longitudinal beam upper plates and one subframe front crossbeam upper plate. The subframe longitudinal beam upper plates and the subframe front crossbeam upper plates are welded together through a welded connection structure. The design of the weld can significantly reduce the local stress of the weld, improve the reliability and service life of the subframe, and enhance the modal and stiffness performance.

[0044] The subframe reinforcement plate with welded connection structure provided in this embodiment can be directly stamped using a stamping process according to the shape of the subframe. It can strengthen the strength and rigidity of the subframe without changing the original structure of the subframe, and it also eliminates the need for new molds, thus reducing development costs.

[0045] Example 2

[0046] This embodiment provides a method for installing a subframe reinforcement plate with a welded connection structure, including: welding two subframe longitudinal beam upper plates and one subframe front crossbeam upper plate together into an integral structure through a welded connection structure to form a subframe reinforcement plate;

[0047] The subframe reinforcement plate is fixed to the crossbeams and longitudinal beams at the front of the subframe using a welding process.

[0048] In this embodiment, the pre-processed subframe reinforcement plate can be directly installed on the subframe. The entire installation method is simple and easy to implement.

[0049] Example 3

[0050] In a typical embodiment of the present invention, a subframe is provided, including a subframe reinforcing plate with a welded connection structure as described in Embodiment 1. The subframe is provided with a front crossbeam 301, a middle crossbeam 302, a rear crossbeam 303, a front longitudinal beam 304, and a rear longitudinal beam 305. The two ends of the front crossbeam 301 and the middle crossbeam 302 are connected by the front longitudinal beam 304, and the two ends of the middle crossbeam 302 and the rear crossbeam 303 are connected by the rear longitudinal beam 305. After connection, the subframe forms a U-shaped structure. The upper plate 1 of the subframe longitudinal beam is installed on the front longitudinal beam 304, and the upper plate 2 of the front crossbeam is installed on the front crossbeam 301.

[0051] In this embodiment, the subframe is provided with stabilizer bar mounting holes, steering gear mounting holes, engine mount mounting holes, and body connection points. These mounting holes and connection points are designed on the longitudinal beams and cross beams of the subframe, and their specific positions can be set as needed.

[0052] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A subframe reinforcing plate with a welded connection structure, characterized in that, include: Two subframe longitudinal beam upper plates and one subframe front crossbeam upper plate are provided. The two subframe longitudinal beam upper plates are respectively connected to both ends of the subframe front crossbeam upper plate by a welded connection structure. There are overlapping surfaces at the connection positions of the subframe longitudinal beam upper plates and the subframe front crossbeam upper plates, and the connection positions are welded. The welded connection structure includes a welded surface on the upper plate of the longitudinal beam of the subframe and a welded line on the upper plate of the front crossbeam of the subframe. The welding surface includes the side surface of the upper plate of the longitudinal beam, the rounded corner surface of the upper plate of the longitudinal beam, and the top surface of the upper plate of the longitudinal beam, which are connected in sequence. The welding line includes a side welding line, a rounded corner welding line, and a top surface welding line connected in sequence; The upper plate of the longitudinal beam is connected by welding to the side and side weld lines, the upper plate of the longitudinal beam is connected by welding to the rounded corner surface and rounded corner weld lines, and the upper plate of the longitudinal beam is connected by welding to the top surface weld lines.

2. The subframe reinforcing plate with a welded connection structure as described in claim 1, characterized in that, The side surface and top surface of the upper plate of the longitudinal beam are respectively perpendicular to the rounded corner surface of the upper plate of the longitudinal beam. The side welding line and the top welding line are respectively set perpendicular to the rounded corner welding line.

3. The subframe reinforcing plate with a welded connection structure as described in claim 1, characterized in that, The welding line on the top surface is arc-shaped, and the side of the top surface of the upper plate of the longitudinal beam is arc-shaped.

4. The subframe reinforcing plate with a welded connection structure as described in claim 1, characterized in that, The upper plate of the subframe longitudinal beam and the upper plate of the subframe front crossbeam are located at the front of the subframe assembly.

5. The subframe reinforcing plate with a welded connection structure as described in claim 1, characterized in that, Both the upper plate of the longitudinal beam of the subframe and the upper plate of the front crossbeam of the subframe are integral structures formed by stamping high-strength steel.

6. A method for installing a subframe reinforcing plate with a welded connection structure as described in any one of claims 1-5, characterized in that, include: Two subframe longitudinal beam upper plates and one subframe front cross beam upper plate are welded together into a single structure to form a subframe reinforcement plate. The subframe reinforcement plate is fixed to the crossbeams and longitudinal beams at the front of the subframe using a welding process.

7. A subframe, comprising a subframe reinforcing plate with a welded connection structure as described in any one of claims 1-5, characterized in that, The subframe is provided with a front crossbeam, a middle crossbeam, a rear crossbeam, a front longitudinal beam, and a rear longitudinal beam. The two ends of the front crossbeam and the middle crossbeam are connected by the front longitudinal beam, and the two ends of the middle crossbeam and the rear crossbeam are connected by the rear longitudinal beam. The upper plate of the longitudinal beam is mounted on the front longitudinal beam, and the upper plate of the front crossbeam is mounted on the front crossbeam.

8. The subframe as described in claim 7, characterized in that, The subframe is equipped with stabilizer bar mounting holes, steering gear mounting holes, engine mount mounting holes, and body connection points.

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